merging main

PowerToys.sln

@@ -5,11 +5,13 @@ MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "runner", "src\runner\runner.vcxproj", "{9412D5C6-2CF2-4FC2-A601-B55508EA9B27}"
 	ProjectSection(ProjectDependencies) = postProject
 		{031AC72E-FA28-4AB7-B690-6F7B9C28AA73} = {031AC72E-FA28-4AB7-B690-6F7B9C28AA73}
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC} = {08E71C67-6A7E-4CA1-B04E-2FB336410BAC}
 		{0B43679E-EDFA-4DA0-AD30-F4628B308B1B} = {0B43679E-EDFA-4DA0-AD30-F4628B308B1B}
 		{0B593A6C-4143-4337-860E-DB5710FB87DB} = {0B593A6C-4143-4337-860E-DB5710FB87DB}
 		{17DA04DF-E393-4397-9CF0-84DABE11032E} = {17DA04DF-E393-4397-9CF0-84DABE11032E}
 		{217DF501-135C-4E38-BFC8-99D4821032EA} = {217DF501-135C-4E38-BFC8-99D4821032EA}
 		{2BE46397-4DFA-414C-9BD4-41E4BBF8CB34} = {2BE46397-4DFA-414C-9BD4-41E4BBF8CB34}
+		{38177D56-6AD1-4ADF-88C9-2843A7932166} = {38177D56-6AD1-4ADF-88C9-2843A7932166}
 		{48804216-2A0E-4168-A6D8-9CD068D14227} = {48804216-2A0E-4168-A6D8-9CD068D14227}
 		{51920F1F-C28C-4ADF-8660-4238766796C2} = {51920F1F-C28C-4ADF-8660-4238766796C2}
 		{5CCC8468-DEC8-4D36-99D4-5C891BEBD481} = {5CCC8468-DEC8-4D36-99D4-5C891BEBD481}
@@ -801,6 +803,12 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.CmdPal.Ext.WebSea
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.CmdPal.Ext.Shell.UnitTests", "src\modules\cmdpal\Tests\Microsoft.CmdPal.Ext.Shell.UnitTests\Microsoft.CmdPal.Ext.Shell.UnitTests.csproj", "{E816D7B4-4688-4ECB-97CC-3D8E798F3833}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "LightSwitch", "LightSwitch", "{5B201255-53C8-490B-A34F-01F05D48A477}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "LightSwitchModuleInterface", "src\modules\LightSwitch\LightSwitchModuleInterface\LightSwitchModuleInterface.vcxproj", "{38177D56-6AD1-4ADF-88C9-2843A7932166}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "LightModeService", "src\modules\LightSwitch\LightSwitchService\LightSwitchService.vcxproj", "{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|ARM64 = Debug|ARM64
@@ -2919,6 +2927,22 @@ Global
 		{E816D7B4-4688-4ECB-97CC-3D8E798F3833}.Release|ARM64.Build.0 = Release|ARM64
 		{E816D7B4-4688-4ECB-97CC-3D8E798F3833}.Release|x64.ActiveCfg = Release|x64
 		{E816D7B4-4688-4ECB-97CC-3D8E798F3833}.Release|x64.Build.0 = Release|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Debug|ARM64.Build.0 = Debug|ARM64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Debug|x64.ActiveCfg = Debug|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Debug|x64.Build.0 = Debug|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Release|ARM64.ActiveCfg = Release|ARM64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Release|ARM64.Build.0 = Release|ARM64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Release|x64.ActiveCfg = Release|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Release|x64.Build.0 = Release|x64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Debug|ARM64.Build.0 = Debug|ARM64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Debug|x64.ActiveCfg = Debug|x64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Debug|x64.Build.0 = Debug|x64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Release|ARM64.ActiveCfg = Release|ARM64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Release|ARM64.Build.0 = Release|ARM64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Release|x64.ActiveCfg = Release|x64
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -3237,6 +3261,9 @@ Global
 		{E816D7B3-4688-4ECB-97CC-3D8E798F3832} = {8EF25507-2575-4ADE-BF7E-D23376903AB8}
 		{E816D7B2-4688-4ECB-97CC-3D8E798F3831} = {8EF25507-2575-4ADE-BF7E-D23376903AB8}
 		{E816D7B4-4688-4ECB-97CC-3D8E798F3833} = {8EF25507-2575-4ADE-BF7E-D23376903AB8}
+		{5B201255-53C8-490B-A34F-01F05D48A477} = {4574FDD0-F61D-4376-98BF-E5A1262C11EC}
+		{38177D56-6AD1-4ADF-88C9-2843A7932166} = {5B201255-53C8-490B-A34F-01F05D48A477}
+		{08E71C67-6A7E-4CA1-B04E-2FB336410BAC} = {5B201255-53C8-490B-A34F-01F05D48A477}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {C3A2F9D1-7930-4EF4-A6FC-7EE0A99821D0}

nuget.config

@@ -2,11 +2,11 @@
 <configuration>
 	<packageSources>
 		<clear />
-		<add key="PowerToysPublicDependencies" value="https://pkgs.dev.azure.com/shine-oss/PowerToys/_packaging/PowerToysPublicDependencies/nuget/v3/index.json" />
+		<add key="PowerToysPublicDependencies" value="https://pkgs.dev.azure.com/shine-oss/PowerToys/_packaging/PowerToysPublicDependencies%40Local/nuget/v3/index.json" />
 	</packageSources>
 	<packageSourceMapping>
 		<packageSource key="PowerToysPublicDependencies">
 			<package pattern="*" />
 		</packageSource>
 	</packageSourceMapping>
-</configuration>
+</configuration>

src/common/Common.UI/SettingsDeepLink.cs

@@ -17,6 +17,7 @@ namespace Common.UI
             Awake,
             ColorPicker,
             CmdNotFound,
+            LightSwitch,
             FancyZones,
             FileLocksmith,
             Run,
@@ -60,6 +61,8 @@ namespace Common.UI
                     return "ColorPicker";
                 case SettingsWindow.CmdNotFound:
                     return "CmdNotFound";
+                case SettingsWindow.LightSwitch:
+                    return "LightSwitch";
                 case SettingsWindow.FancyZones:
                     return "FancyZones";
                 case SettingsWindow.FileLocksmith:

src/common/GPOWrapper/GPOWrapper.cpp

@@ -28,6 +28,10 @@ namespace winrt::PowerToys::GPOWrapper::implementation
     {
         return static_cast<GpoRuleConfigured>(powertoys_gpo::getConfiguredCropAndLockEnabledValue());
     }
+    GpoRuleConfigured GPOWrapper::GetConfiguredLightSwitchEnabledValue()
+    {
+        return static_cast<GpoRuleConfigured>(powertoys_gpo::getConfiguredLightSwitchEnabledValue());
+    }
     GpoRuleConfigured GPOWrapper::GetConfiguredFancyZonesEnabledValue()
     {
         return static_cast<GpoRuleConfigured>(powertoys_gpo::getConfiguredFancyZonesEnabledValue());

src/common/GPOWrapper/GPOWrapper.h

@@ -13,6 +13,7 @@ namespace winrt::PowerToys::GPOWrapper::implementation
         static GpoRuleConfigured GetConfiguredCmdPalEnabledValue();
         static GpoRuleConfigured GetConfiguredColorPickerEnabledValue();
         static GpoRuleConfigured GetConfiguredCropAndLockEnabledValue();
+        static GpoRuleConfigured GetConfiguredLightSwitchEnabledValue();
         static GpoRuleConfigured GetConfiguredFancyZonesEnabledValue();
         static GpoRuleConfigured GetConfiguredFileLocksmithEnabledValue();
         static GpoRuleConfigured GetConfiguredSvgPreviewEnabledValue();

src/common/GPOWrapper/GPOWrapper.idl

@@ -17,6 +17,7 @@ namespace PowerToys
             static GpoRuleConfigured GetConfiguredCmdPalEnabledValue();
             static GpoRuleConfigured GetConfiguredColorPickerEnabledValue();
             static GpoRuleConfigured GetConfiguredCropAndLockEnabledValue();
+            static GpoRuleConfigured GetConfiguredLightSwitchEnabledValue();
             static GpoRuleConfigured GetConfiguredFancyZonesEnabledValue();
             static GpoRuleConfigured GetConfiguredFileLocksmithEnabledValue();
             static GpoRuleConfigured GetConfiguredSvgPreviewEnabledValue();

src/common/ManagedCommon/ModuleType.cs

@@ -12,6 +12,7 @@ namespace ManagedCommon
         ColorPicker,
         CmdPal,
         CropAndLock,
+        LightSwitch,
         EnvironmentVariables,
         FancyZones,
         FileLocksmith,

src/common/logger/logger_settings.h

@@ -81,6 +81,7 @@ struct LogSettings
     inline const static std::string workspacesSnapshotToolLoggerName = "workspaces-snapshot-tool";
     inline const static std::wstring workspacesSnapshotToolLogPath = L"workspaces-snapshot-tool-log.log";
     inline const static std::string zoomItLoggerName = "zoom-it";
+    inline const static std::string lightSwitchLoggerName = "light-switch";
     inline const static int retention = 30;
     std::wstring logLevel;
     LogSettings();

src/common/utils/elevation.h

@@ -257,7 +257,10 @@ inline HANDLE run_elevated(const std::wstring& file, const std::wstring& params,
         exec_info.nShow = SW_HIDE;
     }
 
-    return ShellExecuteExW(&exec_info) ? exec_info.hProcess : nullptr;
+    // failing bc using "runas" with PowerToys.exe already running?
+    BOOL result = ShellExecuteExW(&exec_info);
+
+    return result  ? exec_info.hProcess : nullptr;
 }
 
 // Run command as non-elevated user, returns true if succeeded, puts the process id into returnPid if returnPid != NULL

src/common/utils/gpo.h

@@ -30,6 +30,7 @@ namespace powertoys_gpo
     const std::wstring POLICY_CONFIGURE_ENABLED_CMD_NOT_FOUND = L"ConfigureEnabledUtilityCmdNotFound";
     const std::wstring POLICY_CONFIGURE_ENABLED_COLOR_PICKER = L"ConfigureEnabledUtilityColorPicker";
     const std::wstring POLICY_CONFIGURE_ENABLED_CROP_AND_LOCK = L"ConfigureEnabledUtilityCropAndLock";
+    const std::wstring POLICY_CONFIGURE_ENABLED_LIGHT_SWITCH = L"ConfigureEnabledUtilityLightSwitch";
     const std::wstring POLICY_CONFIGURE_ENABLED_FANCYZONES = L"ConfigureEnabledUtilityFancyZones";
     const std::wstring POLICY_CONFIGURE_ENABLED_FILE_LOCKSMITH = L"ConfigureEnabledUtilityFileLocksmith";
     const std::wstring POLICY_CONFIGURE_ENABLED_SVG_PREVIEW = L"ConfigureEnabledUtilityFileExplorerSVGPreview";
@@ -295,6 +296,11 @@ namespace powertoys_gpo
         return getUtilityEnabledValue(POLICY_CONFIGURE_ENABLED_CROP_AND_LOCK);
     }
 
+    inline gpo_rule_configured_t getConfiguredLightSwitchEnabledValue()
+    {
+        return getUtilityEnabledValue(POLICY_CONFIGURE_ENABLED_LIGHT_SWITCH);
+    }
+
     inline gpo_rule_configured_t getConfiguredFancyZonesEnabledValue()
     {
         return getUtilityEnabledValue(POLICY_CONFIGURE_ENABLED_FANCYZONES);

src/common/utils/logger_helper.h

@@ -3,6 +3,7 @@
 #include <filesystem>
 #include <common/version/version.h>
 #include <common/SettingsAPI/settings_helpers.h>
+#include <common/logger/logger_settings.h>
 
 namespace LoggerHelpers
 {

src/gpo/assets/PowerToys.admx

@@ -137,6 +137,16 @@
         <decimal value="0" />
       </disabledValue>
     </policy>
+    <policy name="ConfigureEnabledUtilityLightSwitch" class="Both" displayName="$(string.ConfigureEnabledUtilityLightSwitch)" explainText="$(string.ConfigureEnabledUtilityDescription)" key="Software\Policies\PowerToys" valueName="ConfigureEnabledUtilityLightSwitch">
+      <parentCategory ref="PowerToys" />
+      <supportedOn ref="SUPPORTED_POWERTOYS_0_90_0" />
+      <enabledValue>
+        <decimal value="1" />
+      </enabledValue>
+      <disabledValue>
+        <decimal value="0" />
+      </disabledValue>
+    </policy>
     <policy name="ConfigureEnabledUtilityEnvironmentVariables" class="Both" displayName="$(string.ConfigureEnabledUtilityEnvironmentVariables)" explainText="$(string.ConfigureEnabledUtilityDescription)" key="Software\Policies\PowerToys" valueName="ConfigureEnabledUtilityEnvironmentVariables">
       <parentCategory ref="PowerToys" />
       <supportedOn ref="SUPPORTED_POWERTOYS_0_75_0" />

src/gpo/assets/en-US/PowerToys.adml

@@ -245,6 +245,7 @@ If you don't configure this policy, the user will be able to control the setting
       <string id="ConfigureEnabledUtilityCmdNotFound">Command Not Found: Configure enabled state</string>
       <string id="ConfigureEnabledUtilityCmdPal">CmdPal: Configure enabled state</string>
       <string id="ConfigureEnabledUtilityCropAndLock">Crop And Lock: Configure enabled state</string>
+      <string id="ConfigureEnabledUtilityLightSwitch">Light Switch: Configure enabled state</string>
       <string id="ConfigureEnabledUtilityEnvironmentVariables">Environment Variables: Configure enabled state</string>
       <string id="ConfigureEnabledUtilityFancyZones">FancyZones: Configure enabled state</string>
       <string id="ConfigureEnabledUtilityFileLocksmith">File Locksmith: Configure enabled state</string>

src/modules/LightSwitch/LightSwitchModuleInterface/LightSwitchModuleInterface.rc

@@ -0,0 +1,32 @@
+1 VERSIONINFO
+ FILEVERSION 0,1,0,0
+ PRODUCTVERSION 0,1,0,0
+ FILEFLAGSMASK 0x3fL
+#ifdef _DEBUG
+ FILEFLAGS 0x1L
+#else
+ FILEFLAGS 0x0L
+#endif
+ FILEOS 0x40004L
+ FILETYPE 0x2L
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "CompanyName", "Company Name"
+            VALUE "FileDescription", "Light Switch Module"
+            VALUE "FileVersion", "0.1.0.0"
+            VALUE "InternalName", "Light Switch"
+            VALUE "LegalCopyright", "Copyright (C) 2019 Company Name"
+            VALUE "OriginalFilename", "PowerToys.LightSwitchModuleInterface.dll"
+            VALUE "ProductName", "Light Switch"
+            VALUE "ProductVersion", "0.1.0.0"
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x409, 1200
+    END
+END

src/modules/LightSwitch/LightSwitchModuleInterface/LightSwitchModuleInterface.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36127.28 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "LightSwitchModuleInterface", "LightSwitchModuleInterface.vcxproj", "{38177D56-6AD1-4ADF-88C9-2843A7932166}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Release|x64 = Release|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Debug|x64.ActiveCfg = Debug|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Debug|x64.Build.0 = Debug|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Release|x64.ActiveCfg = Release|x64
+		{38177D56-6AD1-4ADF-88C9-2843A7932166}.Release|x64.Build.0 = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FAF634A3-0D98-4A45-B082-D93B59782572}
+	EndGlobalSection
+EndGlobal

src/modules/LightSwitch/LightSwitchModuleInterface/LightSwitchModuleInterface.vcxproj

@@ -0,0 +1,229 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.240111.5\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.240111.5\build\native\Microsoft.Windows.CppWinRT.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{38177d56-6ad1-4adf-88c9-2843a7932166}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>LightSwitchModuleInterface</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+    <ProjectName>LightSwitchModuleInterface</ProjectName>
+    <TargetName>PowerToys.LightSwitchModuleInterface</TargetName>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <OutDir>$(SolutionDir)$(Platform)\$(Configuration)\modules\</OutDir>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+    <OutDir>$(SolutionDir)$(Platform)\$(Configuration)\modules\</OutDir>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;EXAMPLEPOWERTOY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <LanguageStandard>stdcpplatest</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;EXAMPLEPOWERTOY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <LanguageStandard>stdcpplatest</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;EXAMPLEPOWERTOY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <LanguageStandard>stdcpplatest</LanguageStandard>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;EXAMPLEPOWERTOY_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <LanguageStandard>stdcpplatest</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>
+        $(SolutionDir)src\;
+        $(SolutionDir)src\modules;
+        $(SolutionDir)src\common\Telemetry;
+        %(AdditionalIncludeDirectories)
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+    </ClCompile>
+    <Link>
+      <AdditionalDependencies Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">$(CoreLibraryDependencies);%(AdditionalDependencies);advapi32.lib</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClInclude Include="pch.h" />
+    <ClInclude Include="resource.h" />
+    <ClInclude Include="ThemeHelper.h" />
+    <ClInclude Include="trace.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="dllmain.cpp" />
+    <ClCompile Include="pch.cpp">
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">Create</PrecompiledHeader>
+      <PrecompiledHeaderFile Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">pch.h</PrecompiledHeaderFile>
+      <PrecompiledHeaderFile Condition="'$(Configuration)|$(Platform)'=='Release|x64'">pch.h</PrecompiledHeaderFile>
+      <PrecompiledHeaderFile Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">pch.h</PrecompiledHeaderFile>
+      <PrecompiledHeaderFile Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <ClCompile Include="ThemeHelper.cpp" />
+    <ClCompile Include="trace.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="LightSwitchModuleInterface.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\common\logger\logger.vcxproj">
+      <Project>{d9b8fc84-322a-4f9f-bbb9-20915c47ddfd}</Project>
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+    <ProjectReference Include="..\..\..\common\ManagedCommon\ManagedCommon.csproj">
+      <Project>{4aed67b6-55fd-486f-b917-e543dee2cb3c}</Project>
+    </ProjectReference>
+    <ProjectReference Include="..\..\..\common\SettingsAPI\SettingsAPI.vcxproj">
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Import Project="..\..\..\..\deps\spdlog.props" />
+  <ImportGroup Label="ExtensionTargets">
+    <Import Project="..\..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.240111.5\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.240111.5\build\native\Microsoft.Windows.CppWinRT.targets')" />
+  </ImportGroup>
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
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+</Project>

src/modules/LightSwitch/LightSwitchModuleInterface/LightSwitchModuleInterface.vcxproj.filters

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="dllmain.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="pch.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="trace.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="ThemeHelper.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="pch.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="resource.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="trace.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="ThemeHelper.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{bbf22ac8-46f8-4206-b44b-9c3897e99ce5}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{530ed784-9a70-46a0-8fb6-20d5dee4f7d3}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{da1cb871-86d3-414c-adf5-a7e9f2077d2f}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="LightSwitchModuleInterface.rc">
+      <Filter>Resource Files</Filter>
+    </ResourceCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+</Project>

src/modules/LightSwitch/LightSwitchModuleInterface/ThemeHelper.cpp

@@ -0,0 +1,81 @@
+#include "pch.h"
+#include <windows.h>
+#include "ThemeHelper.h"
+
+// Controls changing the themes.
+
+void SetAppsTheme(bool mode)
+{
+    HKEY hKey;
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_SET_VALUE,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        DWORD value = mode;
+        RegSetValueEx(hKey, L"AppsUseLightTheme", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
+        RegCloseKey(hKey);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
+    }
+}
+
+void SetSystemTheme(bool mode)
+{
+    HKEY hKey;
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_SET_VALUE,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        DWORD value = mode;
+        RegSetValueEx(hKey, L"SystemUsesLightTheme", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
+        RegCloseKey(hKey);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
+    }
+}
+
+bool GetCurrentSystemTheme()
+{
+    HKEY hKey;
+    DWORD value = 1; // default = light
+    DWORD size = sizeof(value);
+
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_READ,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        RegQueryValueEx(hKey, L"SystemUsesLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
+        RegCloseKey(hKey);
+    }
+
+    return value == 1; // true = light, false = dark
+}
+
+bool GetCurrentAppsTheme()
+{
+    HKEY hKey;
+    DWORD value = 1;
+    DWORD size = sizeof(value);
+
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_READ,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        RegQueryValueEx(hKey, L"AppsUseLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
+        RegCloseKey(hKey);
+    }
+
+    return value == 1; // true = light, false = dark
+}

src/modules/LightSwitch/LightSwitchModuleInterface/ThemeHelper.h

@@ -0,0 +1,5 @@
+#pragma once
+void SetSystemTheme(bool dark);
+void SetAppsTheme(bool dark);
+bool GetCurrentSystemTheme();
+bool GetCurrentAppsTheme();

src/modules/LightSwitch/LightSwitchModuleInterface/dllmain.cpp

@@ -0,0 +1,546 @@
+#include "pch.h"
+#include <interface/powertoy_module_interface.h>
+#include "trace.h"
+#include <common/logger/logger.h>
+#include <common/SettingsAPI/settings_objects.h>
+#include <common/SettingsAPI/settings_helpers.h>
+#include <locale>
+#include <codecvt>
+#include <common/utils/logger_helper.h>
+#include "ThemeHelper.h"
+
+extern "C" IMAGE_DOS_HEADER __ImageBase;
+
+namespace
+{
+    const wchar_t JSON_KEY_PROPERTIES[] = L"properties";
+    const wchar_t JSON_KEY_WIN[] = L"win";
+    const wchar_t JSON_KEY_ALT[] = L"alt";
+    const wchar_t JSON_KEY_CTRL[] = L"ctrl";
+    const wchar_t JSON_KEY_SHIFT[] = L"shift";
+    const wchar_t JSON_KEY_CODE[] = L"code";
+    const wchar_t JSON_KEY_TOGGLE_THEME_HOTKEY[] = L"toggle-theme-hotkey";
+    const wchar_t JSON_KEY_VALUE[] = L"value";
+}
+
+BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
+{
+    switch (ul_reason_for_call)
+    {
+    case DLL_PROCESS_ATTACH:
+        Trace::RegisterProvider();
+        break;
+    case DLL_THREAD_ATTACH:
+    case DLL_THREAD_DETACH:
+        break;
+    case DLL_PROCESS_DETACH:
+        Trace::UnregisterProvider();
+        break;
+    }
+    return TRUE;
+}
+
+// The PowerToy name that will be shown in the settings.
+const static wchar_t* MODULE_NAME = L"LightSwitch";
+// Add a description that will we shown in the module settings page.
+const static wchar_t* MODULE_DESC = L"This is a module that allows you to control light/dark theming via set times, sun rise, or directly invoking the change.";
+
+enum class ScheduleMode
+{
+    FixedHours,
+    SunsetToSunriseGeo,
+    SunsetToSunriseUser
+    // add more later
+};
+
+inline std::wstring ToString(ScheduleMode mode)
+{
+    switch (mode)
+    {
+    case ScheduleMode::SunsetToSunriseGeo:
+        return L"SunsetToSunriseGeo";
+    case ScheduleMode::SunsetToSunriseUser:
+        return L"SunsetToSunriseUser";
+    case ScheduleMode::FixedHours:
+    default:
+        return L"FixedHours";
+    }
+}
+
+inline ScheduleMode FromString(const std::wstring& str)
+{
+    if (str == L"SunsetToSunriseGeo")
+        return ScheduleMode::SunsetToSunriseGeo;
+    if (str == L"SunsetToSunriseUser")
+        return ScheduleMode::SunsetToSunriseUser;
+    return ScheduleMode::FixedHours;
+}
+
+// These are the properties shown in the Settings page.
+struct ModuleSettings
+{
+    bool m_changeSystem = true;
+    bool m_changeApps = true;
+    ScheduleMode m_scheduleMode = ScheduleMode::FixedHours;
+    int m_lightTime = 480;
+    int m_darkTime = 1200;
+    int m_offset = 0;
+    std::wstring m_latitude = L"0.0";
+    std::wstring m_longitude = L"0.0";
+} g_settings;
+
+class LightSwitchInterface : public PowertoyModuleIface
+{
+private:
+    bool m_enabled = false;
+
+    HANDLE m_process{ nullptr };
+    HANDLE m_force_light_event_handle;
+    HANDLE m_force_dark_event_handle;
+
+    static const constexpr int NUM_DEFAULT_HOTKEYS = 4;
+
+    Hotkey m_toggle_theme_hotkey = { .win = true, .ctrl = true, .shift = true, .alt = false, .key = 'D' };
+
+    void init_settings();
+
+public:
+    LightSwitchInterface()
+    {
+        LoggerHelpers::init_logger(L"LightSwitch", L"ModuleInterface", LogSettings::lightSwitchLoggerName);
+
+        m_force_light_event_handle = CreateDefaultEvent(L"POWEROYS_LIGHTSWITCH_FORCE_LIGHT");
+        m_force_dark_event_handle = CreateDefaultEvent(L"POWEROYS_LIGHTSWITCH_FORCE_DARK");
+
+        init_settings();
+    };
+
+    virtual const wchar_t* get_key() override
+    {
+        return L"LightSwitch";
+    }
+
+    // Destroy the powertoy and free memory
+    virtual void destroy() override
+    {
+        delete this;
+    }
+
+    // Return the display name of the powertoy, this will be cached by the runner
+    virtual const wchar_t* get_name() override
+    {
+        return MODULE_NAME;
+    }
+
+    // Return the configured status for the gpo policy for the module
+    virtual powertoys_gpo::gpo_rule_configured_t gpo_policy_enabled_configuration() override
+    {
+        return powertoys_gpo::getConfiguredLightSwitchEnabledValue();
+    }
+
+    // Return JSON with the configuration options.
+    virtual bool get_config(wchar_t* buffer, int* buffer_size) override
+    {
+        HINSTANCE hinstance = reinterpret_cast<HINSTANCE>(&__ImageBase);
+
+        // Create a Settings object with your module name
+        PowerToysSettings::Settings settings(hinstance, get_name());
+        settings.set_description(MODULE_DESC);
+        settings.set_overview_link(L"https://aka.ms/powertoys");
+
+        // Boolean toggles
+        settings.add_bool_toggle(
+            L"changeSystem",
+            L"Change System Theme",
+            g_settings.m_changeSystem);
+
+        settings.add_bool_toggle(
+            L"changeApps",
+            L"Change Apps Theme",
+            g_settings.m_changeApps);
+
+        settings.add_choice_group(
+            L"scheduleMode",
+            L"Theme schedule mode",
+            ToString(g_settings.m_scheduleMode),
+            { { L"FixedHours", L"Set hours manually" },
+              { L"SunsetToSunriseGeo", L"Use sunrise/sunset times (Geolocation)" },
+              { L"SunsetToSunriseUser", L"Use sunrise/sunset times (User selected)" } });
+
+        // Integer spinners
+        settings.add_int_spinner(
+            L"lightTime",
+            L"Time to switch to light theme (minutes after midnight).",
+            g_settings.m_lightTime,
+            0,
+            1439,
+            1);
+
+        settings.add_int_spinner(
+            L"darkTime",
+            L"Time to switch to dark theme (minutes after midnight).",
+            g_settings.m_darkTime,
+            0,
+            1439,
+            1);
+
+        settings.add_int_spinner(
+            L"offset",
+            L"Time to offset turning on your light/dark themes.",
+            g_settings.m_offset,
+            0,
+            1439,
+            1);
+
+        // Strings for latitude and longitude
+        settings.add_string(
+            L"latitude",
+            L"Your latitude in decimal degrees (e.g. 39.95).",
+            g_settings.m_latitude);
+
+        settings.add_string(
+            L"longitude",
+            L"Your longitude in decimal degrees (e.g. -75.16).",
+            g_settings.m_longitude);
+
+        // One-shot actions (buttons)
+        settings.add_custom_action(
+            L"forceLight",
+            L"Switch immediately to light theme",
+            L"Force Light",
+            L"{}");
+
+        settings.add_custom_action(
+            L"forceDark",
+            L"Switch immediately to dark theme",
+            L"Force Dark",
+            L"{}");
+
+        // Hotkeys
+        PowerToysSettings::HotkeyObject dm_hk = PowerToysSettings::HotkeyObject::from_settings(
+            m_toggle_theme_hotkey.win,
+            m_toggle_theme_hotkey.ctrl,
+            m_toggle_theme_hotkey.alt,
+            m_toggle_theme_hotkey.shift,
+            m_toggle_theme_hotkey.key);
+
+        settings.add_hotkey(
+            L"toggle-theme-hotkey",
+            L"Shortcut to toggle theme immediately",
+            dm_hk);
+
+        // Serialize to buffer for the PowerToys runner
+        return settings.serialize_to_buffer(buffer, buffer_size);
+    }
+
+    // Signal from the Settings editor to call a custom action.
+    // This can be used to spawn more complex editors.
+    void call_custom_action(const wchar_t* action) override
+    {
+        try
+        {
+            auto action_object = PowerToysSettings::CustomActionObject::from_json_string(action);
+
+            if (action_object.get_name() == L"forceLight")
+            {
+                Logger::info(L"[Light Switch] Custom action triggered: Force Light");
+                SetSystemTheme(true);
+                SetAppsTheme(true);
+            }
+            else if (action_object.get_name() == L"forceDark")
+            {
+                Logger::info(L"[Light Switch] Custom action triggered: Force Dark");
+                SetSystemTheme(false);
+                SetAppsTheme(false);
+            }
+        }
+        catch (...)
+        {
+            Logger::error(L"[Light Switch] Invalid custom action JSON");
+        }
+    }
+
+    // Called by the runner to pass the updated settings values as a serialized JSON.
+    virtual void set_config(const wchar_t* config) override
+    {
+        try
+        {
+            auto values = PowerToysSettings::PowerToyValues::from_json_string(config, get_key());
+
+            parse_hotkey(values);
+
+            if (auto v = values.get_bool_value(L"changeSystem"))
+            {
+                g_settings.m_changeSystem = *v;
+            }
+
+            if (auto v = values.get_bool_value(L"changeApps"))
+            {
+                g_settings.m_changeApps = *v;
+            }
+
+            if (auto v = values.get_string_value(L"scheduleMode"))
+            {
+                g_settings.m_scheduleMode = FromString(*v);
+            }
+
+            if (auto v = values.get_int_value(L"lightTime"))
+            {
+                g_settings.m_lightTime = *v;
+            }
+
+            if (auto v = values.get_int_value(L"darkTime"))
+            {
+                g_settings.m_darkTime = *v;
+            }
+
+            if (auto v = values.get_int_value(L"offset"))
+            {
+                g_settings.m_offset = *v;
+            }
+
+            if (auto v = values.get_string_value(L"latitude"))
+            {
+                g_settings.m_latitude = *v;
+            }
+            if (auto v = values.get_string_value(L"longitude"))
+            {
+                g_settings.m_longitude = *v;
+            }
+
+            values.save_to_settings_file();
+        }
+        catch (const std::exception&)
+        {
+            Logger::error("[Light Switch] set_config: Failed to parse or apply config.");
+        }
+    }
+
+    virtual void enable()
+    {
+        m_enabled = true;
+        Logger::info(L"Enabling Light Switch module...");
+
+        unsigned long powertoys_pid = GetCurrentProcessId();
+        std::wstring args = L"--pid " + std::to_wstring(powertoys_pid);
+        std::wstring exe_name = L"LightSwitchService\\PowerToys.LightSwitchService.exe";
+
+        std::wstring resolved_path(MAX_PATH, L'\0');
+        DWORD result = SearchPathW(
+            nullptr,
+            exe_name.c_str(),
+            nullptr,
+            static_cast<DWORD>(resolved_path.size()),
+            resolved_path.data(),
+            nullptr);
+
+        if (result == 0 || result >= resolved_path.size())
+        {
+            Logger::error(L"Failed to locate Light Switch executable: '{}'", exe_name);
+            return;
+        }
+
+        resolved_path.resize(result);
+        Logger::debug(L"Resolved executable path: {}", resolved_path);
+
+        std::wstring command_line = L"\"" + resolved_path + L"\" " + args;
+
+        STARTUPINFO si = { sizeof(si) };
+        PROCESS_INFORMATION pi;
+
+        if (!CreateProcessW(
+                resolved_path.c_str(),
+                command_line.data(),
+                nullptr,
+                nullptr,
+                TRUE,
+                0,
+                nullptr,
+                nullptr,
+                &si,
+                &pi))
+        {
+            Logger::error(L"Failed to launch Light Switch process. {}", get_last_error_or_default(GetLastError()));
+            return;
+        }
+
+        Logger::info(L"Light Switch process launched successfully (PID: {}).", pi.dwProcessId);
+        m_process = pi.hProcess;
+        CloseHandle(pi.hThread);
+    }
+
+    // Disable the powertoy
+    virtual void disable()
+    {
+        Logger::info("Light Switch disabling");
+        m_enabled = false;
+
+        if (m_process)
+        {
+            constexpr DWORD timeout_ms = 1500;
+            DWORD result = WaitForSingleObject(m_process, timeout_ms);
+
+            if (result == WAIT_TIMEOUT)
+            {
+                Logger::warn("Light Switch: Process didn't exit in time. Forcing termination.");
+                TerminateProcess(m_process, 0);
+            }
+
+            CloseHandle(m_process);
+            m_process = nullptr;
+        }
+    }
+
+    // Returns if the powertoys is enabled
+    virtual bool is_enabled() override
+    {
+        return m_enabled;
+    }
+
+    void parse_hotkey(PowerToysSettings::PowerToyValues& settings)
+    {
+        auto settingsObject = settings.get_raw_json();
+        if (settingsObject.GetView().Size())
+        {
+            try
+            {
+                Hotkey _temp_toggle_theme;
+                auto jsonHotkeyObject = settingsObject.GetNamedObject(JSON_KEY_PROPERTIES).GetNamedObject(JSON_KEY_TOGGLE_THEME_HOTKEY).GetNamedObject(JSON_KEY_VALUE);
+                _temp_toggle_theme.win = jsonHotkeyObject.GetNamedBoolean(JSON_KEY_WIN);
+                _temp_toggle_theme.alt = jsonHotkeyObject.GetNamedBoolean(JSON_KEY_ALT);
+                _temp_toggle_theme.shift = jsonHotkeyObject.GetNamedBoolean(JSON_KEY_SHIFT);
+                _temp_toggle_theme.ctrl = jsonHotkeyObject.GetNamedBoolean(JSON_KEY_CTRL);
+                _temp_toggle_theme.key = static_cast<unsigned char>(jsonHotkeyObject.GetNamedNumber(JSON_KEY_CODE));
+                m_toggle_theme_hotkey = _temp_toggle_theme;
+            }
+            catch (...)
+            {
+                Logger::error("Failed to initialize Light Switch force dark mode shortcut from settings. Value will keep unchanged.");
+            }
+        }
+        else
+        {
+            Logger::info("Light Switch settings are empty");
+        }
+    }
+
+    virtual size_t get_hotkeys(Hotkey* hotkeys, size_t buffer_size) override
+    {
+        if (hotkeys && buffer_size >= 1)
+        {
+            hotkeys[0] = m_toggle_theme_hotkey;
+        }
+        return 1;
+    }
+
+    virtual bool on_hotkey(size_t hotkeyId) override
+    {
+        if (m_enabled)
+        {
+            Logger::trace(L"Light Switch hotkey pressed");
+            if (!is_process_running())
+            {
+                enable();
+            }
+            else if (hotkeyId == 0)
+            {
+                // get current will return true if in light mode, otherwise false
+                Logger::info(L"[Light Switch] Hotkey triggered: Toggle Theme");
+                if (g_settings.m_changeSystem)
+                {
+                    SetSystemTheme(!GetCurrentSystemTheme());
+                }
+                if (g_settings.m_changeApps)
+                {
+                    SetAppsTheme(!GetCurrentAppsTheme());
+                }
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    bool is_process_running()
+    {
+        return WaitForSingleObject(m_process, 0) == WAIT_TIMEOUT;
+    }
+};
+
+std::wstring utf8_to_wstring(const std::string& str)
+{
+    if (str.empty())
+        return std::wstring();
+
+    int size_needed = MultiByteToWideChar(
+        CP_UTF8,
+        0,
+        str.c_str(),
+        static_cast<int>(str.size()),
+        nullptr,
+        0);
+
+    std::wstring wstr(size_needed, 0);
+
+    MultiByteToWideChar(
+        CP_UTF8,
+        0,
+        str.c_str(),
+        static_cast<int>(str.size()),
+        &wstr[0],
+        size_needed);
+
+    return wstr;
+}
+
+// Load the settings file.
+void LightSwitchInterface::init_settings()
+{
+    Logger::info(L"[Light Switch] init_settings: starting to load settings for module");
+
+    try
+    {
+        PowerToysSettings::PowerToyValues settings =
+            PowerToysSettings::PowerToyValues::load_from_settings_file(get_name());
+
+        parse_hotkey(settings);
+
+        if (auto v = settings.get_bool_value(L"changeSystem"))
+            g_settings.m_changeSystem = *v;
+        if (auto v = settings.get_bool_value(L"changeApps"))
+            g_settings.m_changeApps = *v;
+        if (auto v = settings.get_string_value(L"scheduleMode"))
+            g_settings.m_scheduleMode = FromString(*v);
+        if (auto v = settings.get_int_value(L"lightTime"))
+            g_settings.m_lightTime = *v;
+        if (auto v = settings.get_int_value(L"darkTime"))
+            g_settings.m_darkTime = *v;
+        if (auto v = settings.get_int_value(L"offset"))
+            g_settings.m_offset = *v;
+        if (auto v = settings.get_string_value(L"latitude"))
+            g_settings.m_latitude = *v;
+        if (auto v = settings.get_string_value(L"longitude"))
+            g_settings.m_longitude = *v;
+
+        Logger::info(L"[Light Switch] init_settings: loaded successfully");
+    }
+    catch (const winrt::hresult_error& e)
+    {
+        Logger::error(L"[Light Switch] init_settings: hresult_error 0x{:08X} - {}", e.code(), e.message().c_str());
+    }
+    catch (const std::exception& e)
+    {
+        std::wstring whatStr = utf8_to_wstring(e.what());
+        Logger::error(L"[Light Switch] init_settings: std::exception - {}", whatStr);
+    }
+    catch (...)
+    {
+        Logger::error(L"[Light Switch] init_settings: unknown exception while loading settings");
+    }
+}
+
+extern "C" __declspec(dllexport) PowertoyModuleIface* __cdecl powertoy_create()
+{
+    return new LightSwitchInterface();
+}

src/modules/LightSwitch/LightSwitchModuleInterface/pch.cpp

@@ -0,0 +1,2 @@
+#include "pch.h"
+#pragma comment(lib, "windowsapp")

src/modules/LightSwitch/LightSwitchModuleInterface/pch.h

@@ -0,0 +1,14 @@
+#pragma once
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include <common/SettingsAPI/settings_helpers.h>
+#include <common/utils/gpo.h>
+#include <common/utils/winapi_error.h>
+#include <shlwapi.h>
+#include <shellapi.h>
+#include <winrt/Windows.Foundation.h>
+#include <winrt/Windows.System.h>
+#include <winrt/Windows.Globalization.h>
+#include <winrt/Windows.ApplicationModel.h>
+#include <winrt/Windows.ApplicationModel.Core.h>

src/modules/LightSwitch/LightSwitchModuleInterface/trace.cpp

@@ -0,0 +1,30 @@
+#include "pch.h"
+#include "trace.h"
+#include <TraceLoggingProvider.h>
+
+TRACELOGGING_DEFINE_PROVIDER(
+    g_hProvider,
+    "Microsoft.PowerToys",
+    // {38e8889b-9731-53f5-e901-e8a7c1753074}
+    (0x38e8889b, 0x9731, 0x53f5, 0xe9, 0x01, 0xe8, 0xa7, 0xc1, 0x75, 0x30, 0x74),
+    TraceLoggingOptionProjectTelemetry());
+
+void Trace::RegisterProvider()
+{
+    TraceLoggingRegister(g_hProvider);
+}
+
+void Trace::UnregisterProvider()
+{
+    TraceLoggingUnregister(g_hProvider);
+}
+
+void Trace::MyEvent()
+{
+    TraceLoggingWrite(
+        g_hProvider,
+        "PowerToyName_MyEvent",
+        ProjectTelemetryPrivacyDataTag(ProjectTelemetryTag_ProductAndServicePerformance),
+        TraceLoggingBoolean(TRUE, "UTCReplace_AppSessionGuid"),
+        TraceLoggingKeyword(PROJECT_KEYWORD_MEASURE));
+}

src/modules/LightSwitch/LightSwitchModuleInterface/trace.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <windows.h>
+#include <TraceLoggingActivity.h>
+#include <common/telemetry/ProjectTelemetry.h>
+
+TRACELOGGING_DECLARE_PROVIDER(g_hProvider);
+
+class Trace
+{
+public:
+    static void RegisterProvider();
+    static void UnregisterProvider();
+    static void MyEvent();
+};

src/modules/LightSwitch/LightSwitchService/LightSwitchService.cpp

@@ -0,0 +1,251 @@
+#include <windows.h>
+#include <tchar.h>
+#include "ThemeScheduler.h"
+#include "ThemeHelper.h"
+#include <stdio.h>
+#include <string>
+#include <LightSwitchSettings.h>
+#include <common/utils/gpo.h>
+
+SERVICE_STATUS g_ServiceStatus = {};
+SERVICE_STATUS_HANDLE g_StatusHandle = nullptr;
+HANDLE g_ServiceStopEvent = nullptr;
+
+VOID WINAPI ServiceMain(DWORD argc, LPTSTR* argv);
+VOID WINAPI ServiceCtrlHandler(DWORD dwCtrl);
+DWORD WINAPI ServiceWorkerThread(LPVOID lpParam);
+
+// Entry point for the executable
+int _tmain(int argc, TCHAR* argv[])
+{
+    DWORD parentPid = 0;
+    bool debug = false;
+    for (int i = 1; i < argc; ++i)
+    {
+        if (_tcscmp(argv[i], _T("--debug")) == 0)
+            debug = true;
+        else if (_tcscmp(argv[i], _T("--pid")) == 0 && i + 1 < argc)
+            parentPid = _tstoi(argv[++i]);
+    }
+
+    if (debug)
+    {
+        // Create a console window for debug output
+        AllocConsole();
+        FILE* f;
+        freopen_s(&f, "CONOUT$", "w", stdout);
+        freopen_s(&f, "CONOUT$", "w", stderr);
+
+        SetConsoleTitle(L"LightSwitchService Debug");
+
+        // Console mode (debug)
+        g_ServiceStopEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
+        ServiceWorkerThread(reinterpret_cast<void*>(static_cast<ULONG_PTR>(parentPid)));
+        CloseHandle(g_ServiceStopEvent);
+
+        FreeConsole();
+        return 0;
+    }
+
+    // Try to connect to SCM
+    wchar_t serviceName[] = L"LightSwitchService";
+    SERVICE_TABLE_ENTRYW table[] = { { serviceName, ServiceMain }, { nullptr, nullptr } };
+
+    if (!StartServiceCtrlDispatcherW(table))
+    {
+        DWORD err = GetLastError();
+        if (err == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) // not launched by SCM
+        {
+            g_ServiceStopEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
+            HANDLE hThread = CreateThread(
+                nullptr, 0, ServiceWorkerThread, reinterpret_cast<void*>(static_cast<ULONG_PTR>(parentPid)), 0, nullptr);
+
+            // Wait so the process stays alive
+            WaitForSingleObject(hThread, INFINITE);
+            CloseHandle(hThread);
+            CloseHandle(g_ServiceStopEvent);
+            return 0;
+        }
+        return static_cast<int>(err);
+    }
+
+    return 0;
+}
+
+// Called when the service is launched by Windows
+VOID WINAPI ServiceMain(DWORD, LPTSTR*)
+{
+    g_StatusHandle = RegisterServiceCtrlHandler(_T("LightSwitchService"), ServiceCtrlHandler);
+    if (!g_StatusHandle)
+        return;
+
+    g_ServiceStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
+    g_ServiceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
+    g_ServiceStatus.dwCurrentState = SERVICE_START_PENDING;
+    SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
+
+    g_ServiceStopEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
+    if (!g_ServiceStopEvent)
+    {
+        g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
+        g_ServiceStatus.dwWin32ExitCode = GetLastError();
+        SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
+        return;
+    }
+
+    SECURITY_ATTRIBUTES sa{ sizeof(sa) };
+    sa.bInheritHandle = FALSE;
+    sa.lpSecurityDescriptor = nullptr;
+
+    g_ServiceStatus.dwCurrentState = SERVICE_RUNNING;
+    SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
+
+    HANDLE hThread = CreateThread(nullptr, 0, ServiceWorkerThread, nullptr, 0, nullptr);
+    WaitForSingleObject(hThread, INFINITE);
+    CloseHandle(hThread);
+
+    CloseHandle(g_ServiceStopEvent);
+    g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
+    g_ServiceStatus.dwWin32ExitCode = 0;
+    SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
+}
+
+VOID WINAPI ServiceCtrlHandler(DWORD dwCtrl)
+{
+    switch (dwCtrl)
+    {
+    case SERVICE_CONTROL_STOP:
+        if (g_ServiceStatus.dwCurrentState != SERVICE_RUNNING)
+            break;
+
+        g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
+        SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
+
+        // Signal the service to stop
+        SetEvent(g_ServiceStopEvent);
+        break;
+
+    default:
+        break;
+    }
+}
+
+DWORD WINAPI ServiceWorkerThread(LPVOID lpParam)
+{
+    DWORD parentPid = static_cast<DWORD>(reinterpret_cast<ULONG_PTR>(lpParam));
+    HANDLE hParent = nullptr;
+    if (parentPid)
+        hParent = OpenProcess(SYNCHRONIZE, FALSE, parentPid);
+
+    OutputDebugString(L"[LightSwitchService] Worker thread starting...\n");
+
+    // Initialize settings system
+    LightSwitchSettings::instance().InitFileWatcher();
+
+    auto applyTheme = [](int nowMinutes, int lightMinutes, int darkMinutes, const auto& settings) {
+        bool isLightActive = false;
+
+        if (lightMinutes < darkMinutes)
+        {
+            // Normal case: sunrise < sunset
+            isLightActive = (nowMinutes >= lightMinutes && nowMinutes < darkMinutes);
+        }
+        else
+        {
+            // Wraparound case: e.g. light at 21:00, dark at 06:00
+            isLightActive = (nowMinutes >= lightMinutes || nowMinutes < darkMinutes);
+        }
+
+        if (isLightActive)
+        {
+            if (settings.changeSystem)
+                SetSystemTheme(true);
+            if (settings.changeApps)
+                SetAppsTheme(true);
+        }
+        else
+        {
+            if (settings.changeSystem)
+                SetSystemTheme(false);
+            if (settings.changeApps)
+                SetAppsTheme(false);
+        }
+    };
+
+    // --- At service start: immediately honor the schedule ---
+    {
+        SYSTEMTIME st;
+        GetLocalTime(&st);
+        int nowMinutes = st.wHour * 60 + st.wMinute;
+
+        LightSwitchSettings::instance().LoadSettings();
+        const auto& settings = LightSwitchSettings::instance().settings();
+
+        applyTheme(nowMinutes, settings.lightTime + settings.offset, settings.darkTime + settings.offset, settings);
+    }
+
+    // --- Main loop: wakes once per minute or stop/parent death ---
+    for (;;)
+    {
+        HANDLE waits[2] = { g_ServiceStopEvent, hParent };
+        DWORD count = hParent ? 2 : 1;
+
+        SYSTEMTIME st;
+        GetLocalTime(&st);
+        int nowMinutes = st.wHour * 60 + st.wMinute;
+
+        LightSwitchSettings::instance().LoadSettings();
+        const auto& settings = LightSwitchSettings::instance().settings();
+
+        // Debug print
+        wchar_t msg[160];
+        swprintf_s(msg,
+                   L"[LightSwitchService] now=%02d:%02d | light=%02d:%02d | dark=%02d:%02d\n",
+                   st.wHour,
+                   st.wMinute,
+                   settings.lightTime / 60,
+                   settings.lightTime % 60,
+                   settings.darkTime / 60,
+                   settings.darkTime % 60);
+        OutputDebugString(msg);
+
+        // Apply theme logic
+        applyTheme(nowMinutes, settings.lightTime + settings.offset, settings.darkTime + settings.offset, settings);
+
+        // Sleep until next minute, wake early if stop/parent dies
+        GetLocalTime(&st);
+        int msToNextMinute = (60 - st.wSecond) * 1000 - st.wMilliseconds;
+        if (msToNextMinute < 50)
+            msToNextMinute = 50;
+
+        DWORD wait = WaitForMultipleObjects(count, waits, FALSE, msToNextMinute);
+        if (wait == WAIT_OBJECT_0) // stop event
+            break;
+        if (hParent && wait == WAIT_OBJECT_0 + 1) // parent exited
+            break;
+    }
+
+    if (hParent)
+        CloseHandle(hParent);
+
+    return 0;
+}
+
+int APIENTRY wWinMain(HINSTANCE, HINSTANCE, PWSTR, int)
+{
+    if (powertoys_gpo::getConfiguredLightSwitchEnabledValue() == powertoys_gpo::gpo_rule_configured_disabled)
+    {
+        wchar_t msg[160];
+        swprintf_s(
+            msg,
+            L"Tried to start with a GPO policy setting the utility to always be disabled. Please contact your systems administrator.\n");
+        OutputDebugString(msg);
+        return 0;
+    }
+
+    int argc = 0;
+    LPWSTR* argv = CommandLineToArgvW(GetCommandLineW(), &argc);
+    int rc = _tmain(argc, argv); // reuse your existing logic
+    LocalFree(argv);
+    return rc;
+}

src/modules/LightSwitch/LightSwitchService/LightSwitchService.vcxproj

@@ -0,0 +1,254 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.240111.5\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.240111.5\build\native\Microsoft.Windows.CppWinRT.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>17.0</VCProjectVersion>
+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{08e71c67-6a7e-4ca1-b04e-2fb336410bac}</ProjectGuid>
+    <RootNamespace>LightSwitchService</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.26100.0</WindowsTargetPlatformVersion>
+    <ProjectName>LightSwitchService</ProjectName>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
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+  </PropertyGroup>
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+    <ConfigurationType>Application</ConfigurationType>
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+    <CharacterSet>Unicode</CharacterSet>
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+    <CharacterSet>Unicode</CharacterSet>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
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+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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+  <PropertyGroup Label="UserMacros" />
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+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <AdditionalIncludeDirectories>
+        ./../;
+        $(SolutionDir)src\common\Telemetry;
+        $(SolutionDir)src\common;
+        $(SolutionDir)src\;
+        $(SolutionDir)deps\spdlog\include;
+        ./;
+        %(AdditionalIncludeDirectories)
+      </AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>Advapi32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\common\logger\logger.vcxproj">
+      <Project>{d9b8fc84-322a-4f9f-bbb9-20915c47ddfd}</Project>
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+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
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+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
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+  </ItemDefinitionGroup>
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src/modules/LightSwitch/LightSwitchService/LightSwitchService.vcxproj.filters

@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+      <Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="LightSwitchService.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="ThemeScheduler.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="ThemeHelper.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\common\SettingsAPI\settings_helpers.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\common\SettingsAPI\settings_objects.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\common\SettingsAPI\FileWatcher.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="LightSwitchSettings.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="SettingsConstants.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="WinHookEventIDs.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="ThemeScheduler.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="ThemeHelper.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="LightSwitchSettings.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="SettingsConstants.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="SettingsObserver.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="WinHookEventIDs.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <Natvis Include="$(MSBuildThisFileDirectory)..\..\natvis\wil.natvis" />
+  </ItemGroup>
+</Project>

src/modules/LightSwitch/LightSwitchService/LightSwitchSettings.cpp

@@ -0,0 +1,157 @@
+#include "LightSwitchSettings.h"
+#include <common/utils/json.h>
+#include <common/SettingsAPI/settings_helpers.h>
+#include "SettingsObserver.h"
+
+#include <filesystem>
+#include <fstream>
+#include <WinHookEventIDs.h>
+
+using namespace std;
+
+LightSwitchSettings& LightSwitchSettings::instance()
+{
+    static LightSwitchSettings inst;
+    return inst;
+}
+
+LightSwitchSettings::LightSwitchSettings()
+{
+    LoadSettings();
+}
+
+std::wstring LightSwitchSettings::GetSettingsFileName()
+{
+    return PTSettingsHelper::get_module_save_file_location(L"LightSwitch");
+}
+
+void LightSwitchSettings::InitFileWatcher()
+{
+    const std::wstring& settingsFileName = GetSettingsFileName();
+    m_settingsFileWatcher = std::make_unique<FileWatcher>(settingsFileName, [&]() {
+        PostMessageW(HWND_BROADCAST, WM_PRIV_SETTINGS_CHANGED, NULL, NULL);
+    });
+}
+
+void LightSwitchSettings::AddObserver(SettingsObserver& observer)
+{
+    m_observers.insert(&observer);
+}
+
+void LightSwitchSettings::RemoveObserver(SettingsObserver& observer)
+{
+    m_observers.erase(&observer);
+}
+
+void LightSwitchSettings::NotifyObservers(SettingId id) const
+{
+    for (auto observer : m_observers)
+    {
+        if (observer->WantsToBeNotified(id))
+        {
+            observer->SettingsUpdate(id);
+        }
+    }
+}
+
+void LightSwitchSettings::LoadSettings()
+{
+    try
+    {
+        PowerToysSettings::PowerToyValues values =
+            PowerToysSettings::PowerToyValues::load_from_settings_file(L"LightSwitch");
+
+
+        if (const auto jsonVal = values.get_string_value(L"scheduleMode"))
+        {
+            auto val = *jsonVal;
+            auto newMode = FromString(val);
+            if (m_settings.scheduleMode != newMode)
+            {
+                m_settings.scheduleMode = newMode;
+                NotifyObservers(SettingId::ScheduleMode);
+            }
+        }
+
+        // Latitude
+        if (const auto jsonVal = values.get_string_value(L"latitude"))
+        {
+            auto val = *jsonVal;
+            if (m_settings.latitude != val)
+            {
+                m_settings.latitude = val;
+                NotifyObservers(SettingId::Latitude);
+            }
+        }
+
+        // Longitude
+        if (const auto jsonVal = values.get_string_value(L"longitude"))
+        {
+            auto val = *jsonVal;
+            if (m_settings.longitude != val)
+            {
+                m_settings.longitude = val;
+                NotifyObservers(SettingId::Longitude);
+            }
+        }
+
+        // LightTime
+        if (const auto jsonVal = values.get_int_value(L"lightTime"))
+        {
+            auto val = *jsonVal;
+            if (m_settings.lightTime != val)
+            {
+                m_settings.lightTime = val;
+                NotifyObservers(SettingId::LightTime);
+            }
+        }
+
+        // DarkTime
+        if (const auto jsonVal = values.get_int_value(L"darkTime"))
+        {
+            auto val = *jsonVal;
+            if (m_settings.darkTime != val)
+            {
+                m_settings.darkTime = val;
+                NotifyObservers(SettingId::DarkTime);
+            }
+        }
+
+        // Offset
+        if (const auto jsonVal = values.get_int_value(L"offset")) 
+        {
+            auto val = *jsonVal;
+            if (m_settings.offset != val)
+            {
+                m_settings.offset = val;
+                NotifyObservers(SettingId::Offset);
+            }
+        }
+
+        // ChangeSystem
+        if (const auto jsonVal = values.get_bool_value(L"changeSystem"))
+        {
+            auto val = *jsonVal;
+            if (m_settings.changeSystem != val)
+            {
+                m_settings.changeSystem = val;
+                NotifyObservers(SettingId::ChangeSystem);
+            }
+        }
+
+        // ChangeApps
+        if (const auto jsonVal = values.get_bool_value(L"changeApps"))
+        {
+            auto val = *jsonVal;
+            if (m_settings.changeApps != val)
+            {
+                m_settings.changeApps = val;
+                NotifyObservers(SettingId::ChangeApps);
+            }
+        }
+    }
+    catch (...)
+    {
+        // Keeps defaults if load fails
+    }
+}

src/modules/LightSwitch/LightSwitchService/LightSwitchSettings.h

@@ -0,0 +1,87 @@
+#pragma once
+
+#include <unordered_set>
+#include <string>
+#include <vector>
+#include <memory>
+#include <windows.h>
+
+#include <common/SettingsAPI/FileWatcher.h>
+#include <common/SettingsAPI/settings_objects.h>
+#include <SettingsConstants.h>
+
+class SettingsObserver;
+
+enum class ScheduleMode
+{
+    FixedHours,
+    SunsetToSunrise
+    // Add more in the future
+};
+
+inline std::wstring ToString(ScheduleMode mode)
+{
+    switch (mode)
+    {
+    case ScheduleMode::FixedHours:
+        return L"FixedHours";
+    case ScheduleMode::SunsetToSunrise:
+        return L"SunsetToSunrise";
+    default:
+        return L"FixedHours";
+    }
+}
+
+inline ScheduleMode FromString(const std::wstring& str)
+{
+    if (str == L"SunsetToSunrise")
+        return ScheduleMode::SunsetToSunrise;
+    else
+        return ScheduleMode::FixedHours;
+}
+
+struct LightSwitchConfig
+{
+    ScheduleMode scheduleMode = ScheduleMode::FixedHours;
+
+    std::wstring latitude = L"0.0";
+    std::wstring longitude = L"0.0";
+
+    // Stored as minutes since midnight
+    int lightTime = 8 * 60; // 08:00 default
+    int darkTime = 20 * 60; // 20:00 default
+
+    int offset = 0; // offset in minutes to apply to calculated times
+
+    bool changeSystem = false;
+    bool changeApps = false;
+};
+
+class LightSwitchSettings
+{
+public:
+    static LightSwitchSettings& instance();
+
+    static inline const LightSwitchConfig& settings()
+    {
+        return instance().m_settings;
+    }
+
+    void InitFileWatcher();
+    static std::wstring GetSettingsFileName();
+
+    void AddObserver(SettingsObserver& observer);
+    void RemoveObserver(SettingsObserver& observer);
+
+    void LoadSettings();
+
+private:
+    LightSwitchSettings();
+    ~LightSwitchSettings() = default;
+
+    LightSwitchConfig m_settings;
+    std::unique_ptr<FileWatcher> m_settingsFileWatcher;
+    std::unordered_set<SettingsObserver*> m_observers;
+
+    void NotifyObservers(SettingId id) const;
+};

src/modules/LightSwitch/LightSwitchService/SettingsConstants.cpp

@@ -0,0 +1 @@
+#include "SettingsConstants.h"

src/modules/LightSwitch/LightSwitchService/SettingsConstants.h

@@ -0,0 +1,13 @@
+#pragma once
+
+enum class SettingId
+{
+    ScheduleMode = 0,
+    Latitude,
+    Longitude,
+    LightTime,
+    DarkTime,
+    Offset,
+    ChangeSystem,
+    ChangeApps
+};

src/modules/LightSwitch/LightSwitchService/SettingsObserver.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <unordered_set>
+#include "SettingsConstants.h"
+
+class LightSwitchSettings;
+
+class SettingsObserver
+{
+public:
+    SettingsObserver(std::unordered_set<SettingId> observedSettings) :
+        m_observedSettings(std::move(observedSettings))
+    {
+        LightSwitchSettings::instance().AddObserver(*this);
+    }
+
+    virtual ~SettingsObserver()
+    {
+        LightSwitchSettings::instance().RemoveObserver(*this);
+    }
+
+    // Override this in your class to respond to updates
+    virtual void SettingsUpdate(SettingId type) {}
+
+    bool WantsToBeNotified(SettingId type) const noexcept
+    {
+        return m_observedSettings.contains(type);
+    }
+
+protected:
+    std::unordered_set<SettingId> m_observedSettings;
+};

src/modules/LightSwitch/LightSwitchService/ThemeHelper.cpp

@@ -0,0 +1,80 @@
+#include <windows.h>
+#include "ThemeHelper.h"
+
+// Controls changing the themes.
+
+void SetAppsTheme(bool mode)
+{
+    HKEY hKey;
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_SET_VALUE,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        DWORD value = mode;
+        RegSetValueEx(hKey, L"AppsUseLightTheme", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
+        RegCloseKey(hKey);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
+    }
+}
+
+void SetSystemTheme(bool mode)
+{
+    HKEY hKey;
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_SET_VALUE,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        DWORD value = mode;
+        RegSetValueEx(hKey, L"SystemUsesLightTheme", 0, REG_DWORD, reinterpret_cast<const BYTE*>(&value), sizeof(value));
+        RegCloseKey(hKey);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, reinterpret_cast<LPARAM>(L"ImmersiveColorSet"), SMTO_ABORTIFHUNG, 5000, nullptr);
+
+        SendMessageTimeout(HWND_BROADCAST, WM_THEMECHANGED, 0, 0, SMTO_ABORTIFHUNG, 5000, nullptr);
+    }
+}
+
+bool GetCurrentSystemTheme()
+{
+    HKEY hKey;
+    DWORD value = 1; // default = light
+    DWORD size = sizeof(value);
+
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_READ,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        RegQueryValueEx(hKey, L"SystemUsesLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
+        RegCloseKey(hKey);
+    }
+
+    return value == 1; // true = light, false = dark
+}
+
+bool GetCurrentAppsTheme()
+{
+    HKEY hKey;
+    DWORD value = 1;
+    DWORD size = sizeof(value);
+
+    if (RegOpenKeyEx(HKEY_CURRENT_USER,
+                     L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+                     0,
+                     KEY_READ,
+                     &hKey) == ERROR_SUCCESS)
+    {
+        RegQueryValueEx(hKey, L"AppsUseLightTheme", nullptr, nullptr, reinterpret_cast<LPBYTE>(&value), &size);
+        RegCloseKey(hKey);
+    }
+
+    return value == 1; // true = light, false = dark
+}

src/modules/LightSwitch/LightSwitchService/ThemeHelper.h

@@ -0,0 +1,5 @@
+#pragma once
+void SetSystemTheme(bool dark);
+void SetAppsTheme(bool dark);
+bool GetCurrentSystemTheme();
+bool GetCurrentAppsTheme();

src/modules/LightSwitch/LightSwitchService/ThemeScheduler.cpp

@@ -0,0 +1,89 @@
+#include "ThemeScheduler.h"
+#include <utility>
+
+SunTimes CalculateSunriseSunset(double latitude, double longitude, int year, int month, int day)
+{
+    double zenith = 90.833;
+    int N1 = static_cast<int>(floor(275.0 * month / 9.0));
+    int N2 = static_cast<int>(floor((static_cast<double>(month) + 9) / 12.0));
+    int N3 = static_cast<int>(floor((1.0 + floor((year - 4.0 * floor(year / 4.0) + 2.0) / 3.0))));
+    int N = N1 - (N2 * N3) + day - 30;
+
+    auto calcTime = [&](bool sunrise) -> double {
+        double lngHour = longitude / 15.0;
+        double t = sunrise ? N + ((6 - lngHour) / 24) : N + ((18 - lngHour) / 24);
+
+        double M = (0.9856 * t) - 3.289;
+        double L = M + (1.916 * sin(deg2rad(M))) + (0.020 * sin(2 * deg2rad(M))) + 282.634;
+        if (L < 0)
+            L += 360;
+        if (L > 360)
+            L -= 360;
+
+        double RA = rad2deg(atan(0.91764 * tan(deg2rad(L))));
+        if (RA < 0)
+            RA += 360;
+        if (RA > 360)
+            RA -= 360;
+
+        double Lquadrant = floor(L / 90) * 90;
+        double RAquadrant = floor(RA / 90) * 90;
+        RA = RA + (Lquadrant - RAquadrant);
+        RA /= 15;
+
+        double sinDec = 0.39782 * sin(deg2rad(L));
+        double cosDec = cos(asin(sinDec));
+
+        double cosH = (cos(deg2rad(zenith)) - (sinDec * sin(deg2rad(latitude)))) / (cosDec * cos(deg2rad(latitude)));
+        if (cosH > 1 || cosH < -1)
+            return -1;
+
+        double H = sunrise ? 360 - rad2deg(acos(cosH)) : rad2deg(acos(cosH));
+        H /= 15;
+
+        double T = H + RA - (0.06571 * t) - 6.622;
+        double UT = T - lngHour;
+        while (UT < 0)
+            UT += 24;
+        while (UT >= 24)
+            UT -= 24;
+
+        return UT;
+    };
+
+    double riseUT = calcTime(true);
+    double setUT = calcTime(false);
+
+    auto toLocal = [](double UT) {
+        TIME_ZONE_INFORMATION tz;
+        DWORD state = GetTimeZoneInformation(&tz);
+        double totalBias = tz.Bias;
+
+        if (state == TIME_ZONE_ID_DAYLIGHT)
+            totalBias += tz.DaylightBias;
+        else if (state == TIME_ZONE_ID_STANDARD)
+            totalBias += tz.StandardBias;
+
+        double biasHours = -(totalBias / 60.0);
+        double localTime = UT + biasHours;
+
+        while (localTime < 0)
+            localTime += 24;
+        while (localTime >= 24)
+            localTime -= 24;
+
+        int hour = static_cast<int>(localTime);
+        int minute = static_cast<int>((localTime - hour) * 60);
+        return std::pair<int, int>{ hour, minute };
+    };
+
+    auto [riseHour, riseMinute] = toLocal(riseUT);
+    auto [setHour, setMinute] = toLocal(setUT);
+
+    SunTimes result;
+    result.sunriseHour = riseHour;
+    result.sunriseMinute = riseMinute;
+    result.sunsetHour = setHour;
+    result.sunsetMinute = setMinute;
+    return result;
+}

src/modules/LightSwitch/LightSwitchService/ThemeScheduler.h

@@ -0,0 +1,25 @@
+#pragma once
+#include <cmath>
+#include <ctime>
+#include <windows.h>
+
+// Struct to hold calculated sunrise/sunset times
+struct SunTimes
+{
+    int sunriseHour;
+    int sunriseMinute;
+    int sunsetHour;
+    int sunsetMinute;
+};
+
+constexpr double PI = 3.14159265358979323846;
+constexpr double deg2rad(double deg)
+{
+    return deg * PI / 180.0;
+}
+constexpr double rad2deg(double rad)
+{
+    return rad * 180.0 / PI;
+}
+
+SunTimes CalculateSunriseSunset(double latitude, double longitude, int year, int month, int day);

src/modules/LightSwitch/LightSwitchService/WinHookEventIDs.cpp

@@ -0,0 +1,15 @@
+
+#include "WinHookEventIDs.h"
+#include <wtypes.h>
+#include <mutex>
+
+UINT WM_PRIV_SETTINGS_CHANGED = 0;
+
+std::once_flag init_flag;
+
+void InitializeWinhookEventIds()
+{
+    std::call_once(init_flag, [&] {
+        WM_PRIV_SETTINGS_CHANGED = RegisterWindowMessage(L"{11978F7B-221A-4E65-B9A9-693F7D6E4B25}");
+    });
+}

src/modules/LightSwitch/LightSwitchService/WinHookEventIDs.h

@@ -0,0 +1,6 @@
+#pragma once
+#include <Windows.h>
+
+extern UINT WM_PRIV_SETTINGS_CHANGED; // Scheduled when a watched settings file is updated
+
+void InitializeWinhookEventIds();

src/modules/LightSwitch/LightSwitchService/packages.config

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Windows.CppWinRT" version="2.0.240111.5" targetFramework="native" />
+  <package id="Microsoft.Windows.ImplementationLibrary" version="1.0.231216.1" targetFramework="native" />
+</packages>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowsSettings/Properties/Resources.Designer.cs

@@ -1194,15 +1194,6 @@ namespace Microsoft.CmdPal.Ext.WindowsSettings.Properties {
             }
         }
         
-        /// <summary>
-        ///   Looks up a localized string similar to Dark mode.
-        /// </summary>
-        internal static string DarkMode {
-            get {
-                return ResourceManager.GetString("DarkMode", resourceCulture);
-            }
-        }
-        
         /// <summary>
         ///   Looks up a localized string similar to Data usage.
         /// </summary>
@@ -2130,6 +2121,15 @@ namespace Microsoft.CmdPal.Ext.WindowsSettings.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Light Switch.
+        /// </summary>
+        internal static string LightSwitch {
+            get {
+                return ResourceManager.GetString("LightSwitch", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Local Computer Policy.
         /// </summary>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowsSettings/Properties/Resources.resx

@@ -572,8 +572,8 @@
   <data name="DarkColor" xml:space="preserve">
     <value>Dark color</value>
   </data>
-  <data name="DarkMode" xml:space="preserve">
-    <value>Dark mode</value>
+  <data name="LightSwitch" xml:space="preserve">
+    <value>Light Switch</value>
   </data>
   <data name="DataUsage" xml:space="preserve">
     <value>Data usage</value>

src/modules/imageresizer/ui/ImageResizerUI_p50h3vmc_wpftmp.csproj

@@ -0,0 +1,324 @@
+<Project>
+  <PropertyGroup>
+    <AssemblyName>PowerToys.ImageResizer</AssemblyName>
+    <IntermediateOutputPath>obj\ARM64\Debug\</IntermediateOutputPath>
+    <BaseIntermediateOutputPath>obj\</BaseIntermediateOutputPath>
+    <MSBuildProjectExtensionsPath>D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\</MSBuildProjectExtensionsPath>
+    <_TargetAssemblyProjectName>ImageResizerUI</_TargetAssemblyProjectName>
+    <RootNamespace>ImageResizer</RootNamespace>
+  </PropertyGroup>
+  <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
+  <!-- Look at Directory.Build.props in root for common stuff as well -->
+  <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
+  <Import Project="..\..\..\Common.SelfContained.props" />
+  <PropertyGroup>
+    <AssemblyTitle>PowerToys.ImageResizer</AssemblyTitle>
+    <OutputPath>..\..\..\..\$(Platform)\$(Configuration)\WinUI3Apps\</OutputPath>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
+    <GenerateSatelliteAssembliesForCore>true</GenerateSatelliteAssembliesForCore>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ProjectGuid>{2BE46397-4DFA-414C-9BD4-41E4BBF8CB34}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>ImageResizer</RootNamespace>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationIcon>Resources\ImageResizer.ico</ApplicationIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <EmbeddedResource Update="Properties\Resources.resx">
+      <Generator>PublicResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+  </ItemGroup>
+  <ItemGroup>
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" />
+    <PackageReference Include="System.IO.Abstractions" />
+    <PackageReference Include="WPF-UI" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\common\GPOWrapperProjection\GPOWrapperProjection.csproj" />
+    <ProjectReference Include="..\..\..\common\interop\PowerToys.Interop.vcxproj" />
+    <ProjectReference Include="..\..\..\common\Common.UI\Common.UI.csproj" />
+    <ProjectReference Include="..\..\..\common\ManagedCommon\ManagedCommon.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Update="Properties\Resources.Designer.cs">
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
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+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\ARM64\Debug\Views\InputPage.g.cs" />
+    <Compile Include="D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\ARM64\Debug\Views\MainWindow.g.cs" />
+    <Compile Include="D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\ARM64\Debug\Views\ProgressPage.g.cs" />
+    <Compile Include="D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\ARM64\Debug\Views\ResultsPage.g.cs" />
+    <Compile Include="D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\ARM64\Debug\App.g.cs" />
+    <Compile Include="D:\source\repos\PowerToys\src\modules\imageresizer\ui\obj\ARM64\Debug\GeneratedInternalTypeHelper.g.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Analyzer Include="C:\Users\jaylynbarbee\.nuget\packages\microsoft.codeanalysis.netanalyzers\9.0.0\analyzers\dotnet\cs\Microsoft.CodeAnalysis.CSharp.NetAnalyzers.dll" />
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+    <Analyzer Include="C:\Program Files\dotnet\packs\Microsoft.WindowsDesktop.App.Ref\9.0.8\analyzers/dotnet/cs/System.Windows.Forms.Analyzers.CodeFixes.CSharp.dll" />
+  </ItemGroup>
+  <Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk" />
+</Project>

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.PowerToys/Components/UtilityKey.cs

@@ -14,7 +14,8 @@ namespace Microsoft.PowerToys.Run.Plugin.PowerToys.Components
         ShortcutGuide = 5,
         RegistryPreview = 6,
         CropAndLock = 7,
-        EnvironmentVariables = 8,
-        Workspaces = 9,
+        LightSwitch = 8,
+        EnvironmentVariables = 9,
+        Workspaces = 10,
     }
 }

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.PowerToys/Properties/Resources.Designer.cs

@@ -77,7 +77,18 @@ namespace Microsoft.PowerToys.Run.Plugin.PowerToys.Properties {
                 return ResourceManager.GetString("Action_Run_As_Administrator", resourceCulture);
             }
         }
-        
+
+        /// <summary>
+        ///   Looks up a localized string similar to Light Switch.
+        /// </summary>
+        internal static string Light_Switch
+        {
+            get
+            {
+                return ResourceManager.GetString("Light_Switch", resourceCulture);
+            }
+        }
+
         /// <summary>
         ///   Looks up a localized string similar to Color Picker.
         /// </summary>

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.WindowsSettings/Properties/Resources.resx

@@ -572,8 +572,8 @@
   <data name="DarkColor" xml:space="preserve">
     <value>Dark color</value>
   </data>
-  <data name="DarkMode" xml:space="preserve">
-    <value>Dark mode</value>
+  <data name="LightSwitch" xml:space="preserve">
+    <value>Light Switch</value>
   </data>
   <data name="DataUsage" xml:space="preserve">
     <value>Data usage</value>

src/runner/main.cpp

@@ -177,6 +177,7 @@ int runner(bool isProcessElevated, bool openSettings, std::string settingsWindow
             L"PowerToys.WorkspacesModuleInterface.dll",
             L"PowerToys.CmdPalModuleInterface.dll",
             L"PowerToys.ZoomItModuleInterface.dll",
+            L"PowerToys.LightSwitchModuleInterface.dll",
         };
 
         for (auto moduleSubdir : knownModules)

src/runner/settings_window.cpp

@@ -757,6 +757,8 @@ std::string ESettingsWindowNames_to_string(ESettingsWindowNames value)
         return "ColorPicker";
     case ESettingsWindowNames::CmdNotFound:
         return "CmdNotFound";
+    case ESettingsWindowNames::LightSwitch:
+        return "LightSwitch";
     case ESettingsWindowNames::FancyZones:
         return "FancyZones";
     case ESettingsWindowNames::FileLocksmith:
@@ -842,6 +844,10 @@ ESettingsWindowNames ESettingsWindowNames_from_string(std::string value)
     {
         return ESettingsWindowNames::CmdNotFound;
     }
+    else if (value == "LightSwitch")
+    {
+        return ESettingsWindowNames::LightSwitch;
+    }
     else if (value == "FancyZones")
     {
         return ESettingsWindowNames::FancyZones;

src/runner/settings_window.h

@@ -10,6 +10,7 @@ enum class ESettingsWindowNames
     Awake,
     ColorPicker,
     CmdNotFound,
+    LightSwitch,
     FancyZones,
     FileLocksmith,
     Run,

src/settings-ui/Settings.UI.Library/EnabledModules.cs

@@ -513,6 +513,23 @@ namespace Microsoft.PowerToys.Settings.UI.Library
             }
         }
 
+        private bool lightSwitch;
+
+        [JsonPropertyName("LightSwitch")]
+        public bool LightSwitch
+        {
+            get => lightSwitch;
+            set
+            {
+                if (lightSwitch != value)
+                {
+                    LogTelemetryEvent(value);
+                    lightSwitch = value;
+                    NotifyChange();
+                }
+            }
+        }
+
         private void NotifyChange()
         {
             notifyEnabledChangedAction?.Invoke();

src/settings-ui/Settings.UI.Library/Helpers/City.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Settings.UI.Library.Helpers
+{
+    public sealed record City(string Name, string Country, double Latitude, double Longitude)
+    {
+        public string Display => string.IsNullOrWhiteSpace(Country)
+            ? Name
+            : $"{Name}, {Country}";
+    }
+}

src/settings-ui/Settings.UI.Library/Helpers/CityLoader.cs

@@ -0,0 +1,122 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Text;
+using Settings.UI.Library.Helpers;
+
+namespace Microsoft.PowerToys.Settings.UI.Helpers
+{
+    public static class CityLoader
+    {
+        /// <summary>
+        /// Loads all cities from a world_cities.csv file.
+        /// Expected columns: city, city_ascii, lat, lng, country
+        /// </summary>
+        public static IEnumerable<City> LoadCities(string path)
+        {
+            using StreamReader reader = new(path);
+
+            // Read header
+            string header = reader.ReadLine();
+            if (header is null)
+            {
+                yield break;
+            }
+
+            List<string> headerCols = SplitCsvLine(header);
+            int idxCity = headerCols.FindIndex(h => string.Equals(h, "city", StringComparison.OrdinalIgnoreCase));
+            int idxCityAscii = headerCols.FindIndex(h => string.Equals(h, "city_ascii", StringComparison.OrdinalIgnoreCase));
+            int idxLat = headerCols.FindIndex(h => string.Equals(h, "lat", StringComparison.OrdinalIgnoreCase));
+            int idxLng = headerCols.FindIndex(h => string.Equals(h, "lng", StringComparison.OrdinalIgnoreCase));
+            int idxCountry = headerCols.FindIndex(h => string.Equals(h, "country", StringComparison.OrdinalIgnoreCase));
+
+            string line;
+            while ((line = reader.ReadLine()) is not null)
+            {
+                if (string.IsNullOrWhiteSpace(line))
+                {
+                    continue;
+                }
+
+                List<string> cols = SplitCsvLine(line);
+
+                string rawCity = idxCity >= 0 && idxCity < cols.Count ? cols[idxCity] : string.Empty;
+                string cityAscii = idxCityAscii >= 0 && idxCityAscii < cols.Count ? cols[idxCityAscii] : string.Empty;
+                string cityName = string.IsNullOrWhiteSpace(cityAscii) ? rawCity : cityAscii;
+                string country = idxCountry >= 0 && idxCountry < cols.Count ? cols[idxCountry] : string.Empty;
+
+                if (!(idxLat >= 0 && idxLat < cols.Count && idxLng >= 0 && idxLng < cols.Count))
+                {
+                    continue;
+                }
+
+                if (!double.TryParse(cols[idxLat], NumberStyles.Float, CultureInfo.InvariantCulture, out double lat))
+                {
+                    continue;
+                }
+
+                if (!double.TryParse(cols[idxLng], NumberStyles.Float, CultureInfo.InvariantCulture, out double lng))
+                {
+                    continue;
+                }
+
+                if (string.IsNullOrWhiteSpace(cityName))
+                {
+                    continue;
+                }
+
+                yield return new City(cityName, country, lat, lng);
+            }
+        }
+
+        /// <summary>
+        /// Splits a CSV line, handling commas inside quotes and escaped quotes.
+        /// </summary>
+        private static List<string> SplitCsvLine(string line)
+        {
+            List<string> result = new();
+            if (string.IsNullOrEmpty(line))
+            {
+                result.Add(string.Empty);
+                return result;
+            }
+
+            bool inQuotes = false;
+            StringBuilder current = new();
+
+            for (int i = 0; i < line.Length; i++)
+            {
+                char c = line[i];
+                if (c == '"')
+                {
+                    if (inQuotes && i + 1 < line.Length && line[i + 1] == '"')
+                    {
+                        current.Append('"');
+                        i++; // skip escaped quote
+                    }
+                    else
+                    {
+                        inQuotes = !inQuotes;
+                    }
+                }
+                else if (c == ',' && !inQuotes)
+                {
+                    result.Add(current.ToString());
+                    current.Clear();
+                }
+                else
+                {
+                    current.Append(c);
+                }
+            }
+
+            result.Add(current.ToString());
+            return result;
+        }
+    }
+}

src/settings-ui/Settings.UI.Library/Helpers/SunCalc.cs

@@ -0,0 +1,131 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+namespace Microsoft.PowerToys.Settings.UI.Library.Helpers
+{
+    public static class SunCalc
+    {
+        public static SunTimes CalculateSunriseSunset(double latitude, double longitude, int year, int month, int day)
+        {
+            double zenith = 90.833; // official sunrise/sunset
+
+            int n1 = (int)Math.Floor(275.0 * month / 9.0);
+            int n2 = (int)Math.Floor((month + 9.0) / 12.0);
+            int n3 = (int)Math.Floor(1.0 + Math.Floor((year - (4.0 * Math.Floor(year / 4.0)) + 2.0) / 3.0));
+            int n = n1 - (n2 * n3) + day - 30;
+
+            double? riseUT = CalcTime(isSunrise: true);
+            double? setUT = CalcTime(isSunrise: false);
+
+            var riseLocal = ToLocal(riseUT, year, month, day);
+            var setLocal = ToLocal(setUT, year, month, day);
+
+            var result = new SunTimes
+            {
+                HasSunrise = riseLocal.HasValue,
+                HasSunset = setLocal.HasValue,
+                SunriseHour = riseLocal?.Hour ?? -1,
+                SunriseMinute = riseLocal?.Minute ?? -1,
+                SunsetHour = setLocal?.Hour ?? -1,
+                SunsetMinute = setLocal?.Minute ?? -1,
+            };
+
+            return result;
+
+            // Local functions
+            double? CalcTime(bool isSunrise)
+            {
+                double lngHour = longitude / 15.0;
+                double t = isSunrise ? n + ((6 - lngHour) / 24.0) : n + ((18 - lngHour) / 24.0);
+
+                double m1 = (0.9856 * t) - 3.289;
+                double l = m1 + (1.916 * Math.Sin(Deg2Rad(m1))) + (0.020 * Math.Sin(2 * Deg2Rad(m1))) + 282.634;
+                l = NormalizeDegrees(l);
+
+                double rA = Rad2Deg(Math.Atan(0.91764 * Math.Tan(Deg2Rad(l))));
+                rA = NormalizeDegrees(rA);
+
+                double lquadrant = Math.Floor(l / 90.0) * 90.0;
+                double rAquadrant = Math.Floor(rA / 90.0) * 90.0;
+                rA = rA + (lquadrant - rAquadrant);
+                rA /= 15.0;
+
+                double sinDec = 0.39782 * Math.Sin(Deg2Rad(l));
+                double cosDec = Math.Cos(Math.Asin(sinDec));
+
+                double cosH = (Math.Cos(Deg2Rad(zenith)) - (sinDec * Math.Sin(Deg2Rad(latitude))))
+                            / (cosDec * Math.Cos(Deg2Rad(latitude)));
+
+                if (cosH > 1.0 || cosH < -1.0)
+                {
+                    // Sun never rises or never sets on this date at this location
+                    return null;
+                }
+
+                double h = isSunrise ? 360.0 - Rad2Deg(Math.Acos(cosH)) : Rad2Deg(Math.Acos(cosH));
+                h /= 15.0;
+
+                double t1 = h + rA - (0.06571 * t) - 6.622;
+                double uT = t1 - lngHour;
+                uT = NormalizeHours(uT);
+
+                return uT;
+            }
+
+            static (int Hour, int Minute)? ToLocal(double? ut, int y, int m, int d)
+            {
+                if (!ut.HasValue)
+                {
+                    return null;
+                }
+
+                // Convert fractional hours to hh:mm with proper rounding
+                int hours = (int)Math.Floor(ut.Value);
+                int minutes = (int)((ut.Value - hours) * 60.0);
+
+                // Normalize minute overflow
+                if (minutes == 60)
+                {
+                    minutes = 0;
+                    hours = (hours + 1) % 24;
+                }
+
+                // Build a UTC DateTime on the given date
+                var utc = new DateTime(y, m, d, hours, minutes, 0, DateTimeKind.Utc);
+
+                // Convert to local time using system time zone rules for that date
+                var local = TimeZoneInfo.ConvertTimeFromUtc(utc, TimeZoneInfo.Local);
+
+                return (local.Hour, local.Minute);
+            }
+
+            static double Deg2Rad(double deg) => deg * Math.PI / 180.0;
+            static double Rad2Deg(double rad) => rad * 180.0 / Math.PI;
+
+            static double NormalizeDegrees(double angle)
+            {
+                angle %= 360.0;
+                if (angle < 0)
+                {
+                    angle += 360.0;
+                }
+
+                return angle;
+            }
+
+            static double NormalizeHours(double hours)
+            {
+                hours %= 24.0;
+                if (hours < 0)
+                {
+                    hours += 24.0;
+                }
+
+                return hours;
+            }
+        }
+    }
+}

src/settings-ui/Settings.UI.Library/Helpers/SunTimes.cs

@@ -0,0 +1,24 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Microsoft.PowerToys.Settings.UI.Library.Helpers
+{
+    public struct SunTimes
+    {
+        public int SunriseHour;
+        public int SunriseMinute;
+        public int SunsetHour;
+        public int SunsetMinute;
+        public string Text;
+
+        public bool HasSunrise;
+        public bool HasSunset;
+    }
+}

src/settings-ui/Settings.UI.Library/LightSwitchProperties.cs

@@ -0,0 +1,61 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    public class LightSwitchProperties
+    {
+        public const bool DefaultChangeSystem = false;
+        public const bool DefaultChangeApps = false;
+        public const int DefaultLightTime = 480;
+        public const int DefaultDarkTime = 1200;
+        public const int DefaultOffset = 0;
+        public const string DefaultLatitude = "0.0";
+        public const string DefaultLongitude = "0.0";
+        public const string DefaultScheduleMode = "FixedHours";
+        public static readonly HotkeySettings DefaultToggleThemeHotkey = new HotkeySettings(true, true, false, true, 0x44); // Ctrl+Win+Shift+D
+
+        public LightSwitchProperties()
+        {
+            ChangeSystem = new BoolProperty(DefaultChangeSystem);
+            ChangeApps = new BoolProperty(DefaultChangeApps);
+            LightTime = new IntProperty(DefaultLightTime);
+            DarkTime = new IntProperty(DefaultDarkTime);
+            Latitude = new StringProperty(DefaultLatitude);
+            Longitude = new StringProperty(DefaultLongitude);
+            Offset = new IntProperty(DefaultOffset);
+            ScheduleMode = new StringProperty(DefaultScheduleMode);
+            ToggleThemeHotkey = new KeyboardKeysProperty(DefaultToggleThemeHotkey);
+        }
+
+        [JsonPropertyName("changeSystem")]
+        public BoolProperty ChangeSystem { get; set; }
+
+        [JsonPropertyName("changeApps")]
+        public BoolProperty ChangeApps { get; set; }
+
+        [JsonPropertyName("lightTime")]
+        public IntProperty LightTime { get; set; }
+
+        [JsonPropertyName("darkTime")]
+        public IntProperty DarkTime { get; set; }
+
+        [JsonPropertyName("offset")]
+        public IntProperty Offset { get; set; }
+
+        [JsonPropertyName("latitude")]
+        public StringProperty Latitude { get; set; }
+
+        [JsonPropertyName("longitude")]
+        public StringProperty Longitude { get; set; }
+
+        [JsonPropertyName("scheduleMode")]
+        public StringProperty ScheduleMode { get; set; }
+
+        [JsonPropertyName("toggle-theme-hotkey")]
+        public KeyboardKeysProperty ToggleThemeHotkey { get; set; }
+    }
+}

src/settings-ui/Settings.UI.Library/LightSwitchSettings.cs

@@ -0,0 +1,57 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Reflection;
+using System.Text.Json.Serialization;
+using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.Library.Interfaces;
+
+namespace Settings.UI.Library
+{
+    public class LightSwitchSettings : BasePTModuleSettings, ISettingsConfig, ICloneable
+    {
+        public const string ModuleName = "LightSwitch";
+
+        public LightSwitchSettings()
+        {
+            Name = ModuleName;
+            Version = Assembly.GetExecutingAssembly().GetName().Version.ToString();
+            Properties = new LightSwitchProperties();
+        }
+
+        [JsonPropertyName("properties")]
+        public LightSwitchProperties Properties { get; set; }
+
+        public object Clone()
+        {
+            return new LightSwitchSettings()
+            {
+                Name = Name,
+                Version = Version,
+                Properties = new LightSwitchProperties()
+                {
+                    ChangeSystem = new BoolProperty(Properties.ChangeSystem.Value),
+                    ChangeApps = new BoolProperty(Properties.ChangeApps.Value),
+                    ScheduleMode = new StringProperty(Properties.ScheduleMode.Value),
+                    LightTime = new IntProperty((int)Properties.LightTime.Value),
+                    DarkTime = new IntProperty((int)Properties.DarkTime.Value),
+                    Offset = new IntProperty((int)Properties.Offset.Value),
+                    Latitude = new StringProperty(Properties.Latitude.Value),
+                    Longitude = new StringProperty(Properties.Longitude.Value),
+                },
+            };
+        }
+
+        public string GetModuleName()
+        {
+            return Name;
+        }
+
+        public bool UpgradeSettingsConfiguration()
+        {
+            return false;
+        }
+    }
+}

src/settings-ui/Settings.UI.Library/SndLightSwitchSettings.cs

@@ -0,0 +1,30 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Settings.UI.Library;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    public class SndLightSwitchSettings
+    {
+        [JsonPropertyName("LightSwitch")]
+        public LightSwitchSettings Settings { get; set; }
+
+        public SndLightSwitchSettings()
+        {
+        }
+
+        public SndLightSwitchSettings(LightSwitchSettings settings)
+        {
+            Settings = settings;
+        }
+
+        public string ToJsonString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}

src/settings-ui/Settings.UI/Converters/EnumToVisibilityConverter.cs

@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+
+namespace Microsoft.PowerToys.Settings.UI.Converters
+{
+    public partial class EnumToVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, string language)
+        {
+            if (value == null || parameter == null)
+            {
+                return Visibility.Collapsed;
+            }
+
+            string enumString = value.ToString();
+            string targetString = parameter.ToString();
+
+            return enumString.Equals(targetString, StringComparison.OrdinalIgnoreCase)
+                ? Visibility.Visible
+                : Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, string language)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/settings-ui/Settings.UI/Helpers/ModuleHelper.cs

@@ -52,6 +52,7 @@ namespace Microsoft.PowerToys.Settings.UI.Helpers
                 case ModuleType.CmdPal: return generalSettingsConfig.Enabled.CmdPal;
                 case ModuleType.ColorPicker: return generalSettingsConfig.Enabled.ColorPicker;
                 case ModuleType.CropAndLock: return generalSettingsConfig.Enabled.CropAndLock;
+                case ModuleType.LightSwitch: return generalSettingsConfig.Enabled.LightSwitch;
                 case ModuleType.EnvironmentVariables: return generalSettingsConfig.Enabled.EnvironmentVariables;
                 case ModuleType.FancyZones: return generalSettingsConfig.Enabled.FancyZones;
                 case ModuleType.FileLocksmith: return generalSettingsConfig.Enabled.FileLocksmith;
@@ -88,6 +89,7 @@ namespace Microsoft.PowerToys.Settings.UI.Helpers
                 case ModuleType.CmdPal: generalSettingsConfig.Enabled.CmdPal = isEnabled; break;
                 case ModuleType.ColorPicker: generalSettingsConfig.Enabled.ColorPicker = isEnabled; break;
                 case ModuleType.CropAndLock: generalSettingsConfig.Enabled.CropAndLock = isEnabled; break;
+                case ModuleType.LightSwitch: generalSettingsConfig.Enabled.LightSwitch = isEnabled; break;
                 case ModuleType.EnvironmentVariables: generalSettingsConfig.Enabled.EnvironmentVariables = isEnabled; break;
                 case ModuleType.FancyZones: generalSettingsConfig.Enabled.FancyZones = isEnabled; break;
                 case ModuleType.FileLocksmith: generalSettingsConfig.Enabled.FileLocksmith = isEnabled; break;
@@ -159,6 +161,7 @@ namespace Microsoft.PowerToys.Settings.UI.Helpers
                 ModuleType.CmdPal => typeof(CmdPalPage),
                 ModuleType.ColorPicker => typeof(ColorPickerPage),
                 ModuleType.CropAndLock => typeof(CropAndLockPage),
+                ModuleType.LightSwitch => typeof(LightSwitchPage),
                 ModuleType.EnvironmentVariables => typeof(EnvironmentVariablesPage),
                 ModuleType.FancyZones => typeof(FancyZonesPage),
                 ModuleType.FileLocksmith => typeof(FileLocksmithPage),

src/settings-ui/Settings.UI/PowerToys.Settings.csproj

@@ -3,36 +3,43 @@
 	<Import Project="..\..\Common.Dotnet.CsWinRT.props" />
 	<Import Project="..\..\Common.SelfContained.props" />
 
-	<PropertyGroup>
-		<OutputType>WinExe</OutputType>
-		<RootNamespace>Microsoft.PowerToys.Settings.UI</RootNamespace>
-		<ApplicationManifest>app.manifest</ApplicationManifest>
-		<UseWinUI>true</UseWinUI>
-		<EnablePreviewMsixTooling>true</EnablePreviewMsixTooling>
-		<WindowsPackageType>None</WindowsPackageType>
-		<AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
-		<AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
-		<ApplicationIcon>Assets\Settings\icon.ico</ApplicationIcon>
-		<WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
-		<!-- OutputPath looks like this because it has to be called both by settings and publish.cmd -->
-		<OutputPath>..\..\..\$(Platform)\$(Configuration)\WinUI3Apps</OutputPath>
-		<!-- MRT from windows app sdk will search for a pri file with the same name of the module before defaulting to resources.pri -->
-		<ProjectPriFileName>PowerToys.Settings.pri</ProjectPriFileName>
-	</PropertyGroup>
-	<ItemGroup>
-		<None Remove="Assets\Settings\Modules\APDialog.dark.png" />
-		<None Remove="Assets\Settings\Modules\APDialog.light.png" />
-		<None Remove="SettingsXAML\Controls\Dashboard\CheckUpdateControl.xaml" />
-		<None Remove="SettingsXAML\Controls\Dashboard\ShortcutConflictControl.xaml" />
-		<None Remove="SettingsXAML\Controls\KeyVisual\KeyCharPresenter.xaml" />
-		<None Remove="SettingsXAML\Controls\TitleBar\TitleBar.xaml" />
-	</ItemGroup>
-	<ItemGroup>
-		<Page Remove="SettingsXAML\App.xaml" />
-	</ItemGroup>
-	<ItemGroup>
-		<ApplicationDefinition Include="SettingsXAML\App.xaml" />
-	</ItemGroup>
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>Microsoft.PowerToys.Settings.UI</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <UseWinUI>true</UseWinUI>
+    <EnablePreviewMsixTooling>true</EnablePreviewMsixTooling>
+    <WindowsPackageType>None</WindowsPackageType>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
+    <ApplicationIcon>Assets\Settings\icon.ico</ApplicationIcon>
+    <WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
+    <!-- OutputPath looks like this because it has to be called both by settings and publish.cmd -->
+    <OutputPath>..\..\..\$(Platform)\$(Configuration)\WinUI3Apps</OutputPath>
+    <!-- MRT from windows app sdk will search for a pri file with the same name of the module before defaulting to resources.pri -->
+    <ProjectPriFileName>PowerToys.Settings.pri</ProjectPriFileName>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Remove="Assets\world_cities.csv" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Remove="Assets\Settings\Icons\LightSwitch.png" />
+    <None Remove="Assets\Settings\Modules\APDialog.dark.png" />
+    <None Remove="Assets\Settings\Modules\APDialog.light.png" />
+    <None Remove="SettingsXAML\Controls\Dashboard\CheckUpdateControl.xaml" />
+    <None Remove="SettingsXAML\Controls\Dashboard\ShortcutConflictControl.xaml" />
+    <None Remove="SettingsXAML\Controls\KeyVisual\KeyCharPresenter.xaml" />
+    <None Remove="SettingsXAML\Controls\TitleBar\TitleBar.xaml" />
+    <None Remove="SettingsXAML\Controls\Timeline\Timeline.xaml" />
+    <None Remove="SettingsXAML\Controls\Timeline\TimelineStyles.xaml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Page Remove="SettingsXAML\App.xaml" />
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="SettingsXAML\App.xaml" />
+  </ItemGroup>
 
 
 	<!-- See https://learn.microsoft.com/windows/apps/develop/platform/csharp-winrt/net-projection-from-cppwinrt-component for more info -->
@@ -141,6 +148,44 @@
 		</None>
 	</ItemGroup>
 
+  <ItemGroup>
+    <None Update="Assets\Settings\Scripts\CheckCmdNotFoundRequirements.ps1">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Assets\Settings\Scripts\InstallWinGetClientModule.ps1">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Assets\Settings\Scripts\InstallPowerShell7.ps1">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Assets\Settings\Scripts\EnableModule.ps1">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Assets\Settings\Scripts\DisableModule.ps1">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Assets\world_cities.csv">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <Page Update="SettingsXAML\Controls\Timeline\TimelineStyles.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Controls\Timeline\Timeline.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Views\LightSwitchPage.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Controls\KeyVisual\KeyCharPresenter.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Controls\Dashboard\ShortcutConflictControl.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Controls\Dashboard\CheckUpdateControl.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
 	<ItemGroup>
 		<None Update="Assets\Settings\Scripts\CheckCmdNotFoundRequirements.ps1">
 			<CopyToOutputDirectory>Always</CopyToOutputDirectory>

src/settings-ui/Settings.UI/SerializationContext/SourceGenerationContextContext.cs

@@ -10,6 +10,7 @@ using System.Text.Json.Serialization;
 using System.Threading.Tasks;
 using Microsoft.PowerToys.Settings.UI.Helpers;
 using Microsoft.PowerToys.Settings.UI.Library;
+using Settings.UI.Library;
 
 namespace Microsoft.PowerToys.Settings.UI.SerializationContext;
 
@@ -19,6 +20,7 @@ namespace Microsoft.PowerToys.Settings.UI.SerializationContext;
 [JsonSerializable(typeof(ColorPickerSettings))]
 [JsonSerializable(typeof(CropAndLockSettings))]
 [JsonSerializable(typeof(Dictionary<string, List<string>>))]
+[JsonSerializable(typeof(LightSwitchSettings))]
 [JsonSerializable(typeof(FileLocksmithSettings))]
 [JsonSerializable(typeof(FindMyMouseSettings))]
 [JsonSerializable(typeof(IList<PowerToysReleaseInfo>))]

src/settings-ui/Settings.UI/SettingsXAML/App.xaml

@@ -17,6 +17,7 @@
                 <ResourceDictionary Source="/SettingsXAML/Styles/InfoBadge.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Themes/Colors.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Themes/Generic.xaml" />
+                <ResourceDictionary Source="/SettingsXAML/Controls/Timeline/TimelineStyles.xaml" />
 
                 <!--  Other merged dictionaries here  -->
             </ResourceDictionary.MergedDictionaries>

src/settings-ui/Settings.UI/SettingsXAML/App.xaml.cs

@@ -417,6 +417,7 @@ namespace Microsoft.PowerToys.Settings.UI
                 case "Awake": return typeof(AwakePage);
                 case "CmdNotFound": return typeof(CmdNotFoundPage);
                 case "ColorPicker": return typeof(ColorPickerPage);
+                case "LightSwitch": return typeof(LightSwitchPage);
                 case "FancyZones": return typeof(FancyZonesPage);
                 case "FileLocksmith": return typeof(FileLocksmithPage);
                 case "Run": return typeof(PowerLauncherPage);

src/settings-ui/Settings.UI/SettingsXAML/Controls/Timeline/Timeline.xaml

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<UserControl
+    x:Class="Microsoft.PowerToys.Settings.UI.Controls.Timeline"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:local="using:Microsoft.PowerToys.Settings.UI.Controls"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+
+        <Canvas
+            x:Name="HeaderCanvas"
+            Grid.Row="0"
+            Height="24" />
+
+        <!--  Timeline (bands + ticks + labels)  -->
+        <Border
+            Grid.Row="1"
+            BorderBrush="{ThemeResource CardStrokeColorDefaultBrush}"
+            BorderThickness="1"
+            CornerRadius="{ThemeResource OverlayCornerRadius}">
+            <Canvas
+                x:Name="TimelineCanvas"
+                Height="36"
+                Loaded="TimelineCanvas_Loaded" />
+        </Border>
+
+        <!--  Below-chart annotations (sunrise/sunset panels + major labels)  -->
+        <Canvas
+            x:Name="AnnotationCanvas"
+            Grid.Row="2"
+            Height="32" />
+    </Grid>
+</UserControl>

src/settings-ui/Settings.UI/SettingsXAML/Controls/Timeline/Timeline.xaml.cs

@@ -0,0 +1,672 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Shapes;
+using Windows.Foundation;
+
+namespace Microsoft.PowerToys.Settings.UI.Controls
+{
+    public sealed partial class Timeline : UserControl
+    {
+        public TimeSpan StartTime
+        {
+            get => (TimeSpan)GetValue(StartTimeProperty);
+            set => SetValue(StartTimeProperty, value);
+        }
+
+        public static readonly DependencyProperty StartTimeProperty = DependencyProperty.Register(nameof(StartTime), typeof(TimeSpan), typeof(Timeline), new PropertyMetadata(defaultValue: new TimeSpan(22, 0, 0), OnTimeChanged));
+
+        public TimeSpan EndTime
+        {
+            get => (TimeSpan)GetValue(EndTimeProperty);
+            set => SetValue(EndTimeProperty, value);
+        }
+
+        public static readonly DependencyProperty EndTimeProperty = DependencyProperty.Register(nameof(EndTime), typeof(TimeSpan), typeof(Timeline), new PropertyMetadata(defaultValue: new TimeSpan(7, 0, 0), OnTimeChanged));
+
+        public TimeSpan? Sunrise
+        {
+            get => (TimeSpan?)GetValue(SunriseProperty);
+            set => SetValue(SunriseProperty, value);
+        }
+
+        public static readonly DependencyProperty SunriseProperty = DependencyProperty.Register(nameof(Sunrise), typeof(TimeSpan), typeof(Timeline), new PropertyMetadata(defaultValue: null, OnTimeChanged));
+
+        public TimeSpan? Sunset
+        {
+            get => (TimeSpan?)GetValue(SunsetProperty);
+            set => SetValue(SunsetProperty, value);
+        }
+
+        public static readonly DependencyProperty SunsetProperty = DependencyProperty.Register(nameof(Sunset), typeof(TimeSpan), typeof(Timeline), new PropertyMetadata(defaultValue: null, OnTimeChanged));
+
+        private readonly List<int> _tickHours = new();
+
+        // Locale 24h/12h
+        private readonly bool _is24h = CultureInfo.CurrentCulture.DateTimeFormat.ShortTimePattern.Contains('H');
+
+        // Visuals
+        private readonly List<Line> _ticks = new();
+        private readonly List<TextBlock> _majorTickBottomLabels = new(); // 00,06,12,18,24 (below)
+
+        private readonly List<Border> _darkRects = new(); // up to 2 (wrap)
+        private readonly List<Border> _lightRects = new(); // up to 2 (complement)
+
+        private TextBlock _startEdgeLabel; // top-of-chart
+        private TextBlock _endEdgeLabel;
+
+        private Line _sunriseTick;
+        private Line _sunsetTick;
+
+        // Add/replace these constants (top of your class)
+        private const int TickHourStep = 2; // <-- every 2 hours
+
+        private StackPanel _sunrisePanel;  // icon + time (below chart)
+        private StackPanel _sunsetPanel;
+
+        public Timeline()
+        {
+            this.InitializeComponent();
+            this.Loaded += Timeline_Loaded;
+            this.IsEnabledChanged += Timeline_IsEnabledChanged;
+        }
+
+        private void Timeline_Loaded(object sender, RoutedEventArgs e)
+        {
+            CheckEnabledState();
+        }
+
+        private void Timeline_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
+        {
+            CheckEnabledState();
+        }
+
+        private void CheckEnabledState()
+        {
+            if (IsEnabled)
+            {
+                this.Opacity = 1.0;
+            }
+            else
+            {
+                this.Opacity = 0.4;
+            }
+        }
+
+        private static void OnTimeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            ((Timeline)d).Setup();
+        }
+
+        private void Setup()
+        {
+            EnsureBands();
+            EnsureTicks();
+            EnsureStartEndEdgeLabels();
+            EnsureSunriseSunsetTicks();
+            EnsureSunPanels();
+            EnsureMajorTickLabels();
+            UpdateAll();
+        }
+
+        private void TimelineCanvas_Loaded(object sender, RoutedEventArgs e)
+        {
+            // SizeChanged wiring here (as requested)
+            HeaderCanvas.SizeChanged += (_, __) => UpdateAll();
+            TimelineCanvas.SizeChanged += (_, __) => UpdateAll();
+            AnnotationCanvas.SizeChanged += (_, __) => UpdateAll();
+            Setup();
+        }
+
+        private void UpdateAll()
+        {
+            UpdateBandsLayout();
+            UpdateTicksLayout();
+            UpdateStartEndEdgeLabelsLayout();
+            UpdateSunriseSunsetTicksLayout();
+            UpdateSunPanelsLayout();
+            UpdateMajorTickLabelsLayout();
+        }
+
+        // ===== Ticks =====
+        private void EnsureTicks()
+        {
+            if (_ticks.Count > 0)
+            {
+                return;
+            }
+
+            _tickHours.Clear();
+
+            // Build ticks at 0,2,4,...,24 but skip the first/last MAJOR ticks (0 and 24)
+            for (int hour = 0; hour <= 24; hour += TickHourStep)
+            {
+                bool isMajor = hour % 6 == 0;
+                if (isMajor && (hour == 0 || hour == 24))
+                {
+                    continue; // skip first/last major ticks
+                }
+
+                var line = new Line
+                {
+                    Style = (Style)Application.Current.Resources[isMajor ? "MajorHourTickStyle" : "HourTickStyle"],
+                };
+
+                Canvas.SetZIndex(line, 0); // above bands (adjust if needed)
+
+                _ticks.Add(line);
+                _tickHours.Add(hour);
+
+                // If you actually want these IN the chart, use TimelineCanvas instead:
+                AnnotationCanvas.Children.Add(line); // or TimelineCanvas.Children.Add(line);
+            }
+        }
+
+        private void UpdateTicksLayout()
+        {
+            double w = TimelineCanvas.ActualWidth;
+            double h = TimelineCanvas.ActualHeight; // keeping your offset
+            if (w <= 0 || h <= 0)
+            {
+                return;
+            }
+
+            double minorLen = h * 0.1;
+            double majorLen = h * 0.2;
+
+            for (int i = 0; i < _ticks.Count; i++)
+            {
+                int hour = _tickHours[i];
+                double x = Math.Round((hour / 24.0) * w);
+
+                var line = _ticks[i];
+                double len = (hour % 6 == 0) ? majorLen : minorLen;
+
+                line.X1 = x;
+                line.Y1 = 0;
+                line.X2 = x;
+                line.Y2 = len;
+            }
+        }
+
+        // ===== Bands (Dark + Light) =====
+        private void EnsureBands()
+        {
+            if (_darkRects.Count == 0)
+            {
+                _darkRects.Add(MakeBandRect(isDark: true));
+                _darkRects.Add(MakeBandRect(isDark: true));
+            }
+
+            if (_lightRects.Count == 0)
+            {
+                _lightRects.Add(MakeBandRect(isDark: false));
+                _lightRects.Add(MakeBandRect(isDark: false));
+            }
+        }
+
+        private Border MakeBandRect(bool isDark)
+        {
+            var r = new Border();
+            if (isDark)
+            {
+                r.Style = (Style)Application.Current.Resources["DarkBandStyle"];
+                FontIcon icon = new FontIcon();
+                icon.Style = (Style)Application.Current.Resources["DarkBandIconStyle"];
+                r.Child = icon;
+            }
+            else
+            {
+                r.Style = (Style)Application.Current.Resources["LightBandStyle"];
+            }
+
+            Canvas.SetZIndex(r, 5); // below ticks/labels
+            TimelineCanvas.Children.Add(r);
+            return r;
+        }
+
+        private void UpdateBandsLayout()
+        {
+            double w = TimelineCanvas.ActualWidth;
+            double h = TimelineCanvas.ActualHeight;
+            if (w <= 0 || h <= 0)
+            {
+                return;
+            }
+
+            foreach (var r in _darkRects)
+            {
+                r.Height = h;
+                Canvas.SetTop(r, 0);
+            }
+
+            foreach (var r in _lightRects)
+            {
+                r.Height = h;
+                Canvas.SetTop(r, 0);
+            }
+
+            var darkRanges = ToRanges(StartTime, EndTime);       // 1 or 2 segments
+            var lightRanges = ComplementRanges(darkRanges);       // 0..2
+
+            LayoutRangeRects(_darkRects, darkRanges, w);
+            LayoutRangeRects(_lightRects, lightRanges, w);
+        }
+
+        private static void LayoutRangeRects(List<Border> rects, List<(TimeSpan Start, TimeSpan End)> ranges, double width)
+        {
+            for (int i = 0; i < rects.Count; i++)
+            {
+                if (i < ranges.Count)
+                {
+                    var (start, end) = ranges[i];
+                    double x = Math.Round((start.TotalHours / 24.0) * width);
+                    double x2 = Math.Round((end.TotalHours / 24.0) * width);
+
+                    var r = rects[i];
+                    Canvas.SetLeft(r, x);
+                    r.Width = Math.Max(0, x2 - x);
+                    r.Visibility = Visibility.Visible;
+                }
+                else
+                {
+                    rects[i].Visibility = Visibility.Collapsed;
+                }
+            }
+        }
+
+        private static List<(TimeSpan Start, TimeSpan End)> ToRanges(TimeSpan start, TimeSpan end)
+        {
+            // Full day
+            if (start == end)
+            {
+                return new() { (TimeSpan.Zero, TimeSpan.FromHours(24)) };
+            }
+
+            if (start < end)
+            {
+                return new() { (start, end) };
+            }
+
+            // Wraps midnight
+            return new()
+        {
+            (start, TimeSpan.FromHours(24)),
+            (TimeSpan.Zero, end),
+        };
+        }
+
+        private static List<(TimeSpan Start, TimeSpan End)> ComplementRanges(List<(TimeSpan Start, TimeSpan End)> dark)
+        {
+            var res = new List<(TimeSpan, TimeSpan)>();
+
+            // If dark covers the full day, there is no light
+            if (dark.Count == 1 && dark[0].Start == TimeSpan.Zero && dark[0].End == TimeSpan.FromHours(24))
+            {
+                return res;
+            }
+
+            if (dark.Count == 1)
+            {
+                var (ds, de) = dark[0];
+                if (ds > TimeSpan.Zero)
+                {
+                    res.Add((TimeSpan.Zero, ds));
+                }
+
+                if (de < TimeSpan.FromHours(24))
+                {
+                    res.Add((de, TimeSpan.FromHours(24)));
+                }
+            }
+            else
+            {
+                // dark[0] = [a,24), dark[1] = [0,b) => single light [b,a)
+                var a = dark[0].Start;
+                var b = dark[1].End;
+                res.Add((b, a));
+            }
+
+            return res;
+        }
+
+        // ===== Start & End labels (TOP of chart, ABOVE rectangles) =====
+        private void EnsureStartEndEdgeLabels()
+        {
+            if (_startEdgeLabel == null)
+            {
+                _startEdgeLabel = new TextBlock { Style = (Style)Application.Current.Resources["EdgeLabelStyle"] };
+                HeaderCanvas.Children.Add(_startEdgeLabel);
+                Canvas.SetZIndex(_startEdgeLabel, 25);
+            }
+
+            if (_endEdgeLabel == null)
+            {
+                _endEdgeLabel = new TextBlock { Style = (Style)Application.Current.Resources["EdgeLabelStyle"] };
+                HeaderCanvas.Children.Add(_endEdgeLabel);
+                Canvas.SetZIndex(_endEdgeLabel, 25);
+            }
+        }
+
+        private void UpdateStartEndEdgeLabelsLayout()
+        {
+            double w = TimelineCanvas.ActualWidth;
+            if (w <= 0)
+            {
+                return;
+            }
+
+            _startEdgeLabel.Text = FormatTime(StartTime);
+            _endEdgeLabel.Text = FormatTime(EndTime);
+
+            PlaceTopLabelAtTime(_startEdgeLabel, StartTime, w);
+            PlaceTopLabelAtTime(_endEdgeLabel, EndTime, w);
+        }
+
+        private void PlaceTopLabelAtTime(TextBlock tb, TimeSpan t, double timelineWidth)
+        {
+            double x = Math.Round((t.TotalHours / 24.0) * timelineWidth);
+            double textW = MeasureTextWidth(tb);
+            double desiredLeft = x - (textW / 2.0);
+
+            Canvas.SetLeft(tb, Clamp(desiredLeft, 0, timelineWidth - textW));
+            Canvas.SetTop(tb, 0);
+            tb.Visibility = Visibility.Visible;
+        }
+
+        // ===== Sunrise/Sunset ticks on chart =====
+        private void EnsureSunriseSunsetTicks()
+        {
+            if (_sunriseTick == null)
+            {
+                _sunriseTick = new Line { Style = (Style)Application.Current.Resources["SunRiseMarkerTickStyle"] };
+                TimelineCanvas.Children.Add(_sunriseTick);
+                Canvas.SetZIndex(_sunriseTick, 12);
+            }
+
+            if (_sunsetTick == null)
+            {
+                _sunsetTick = new Line { Style = (Style)Application.Current.Resources["SunSetMarkerTickStyle"] };
+                TimelineCanvas.Children.Add(_sunsetTick);
+                Canvas.SetZIndex(_sunsetTick, 12);
+            }
+        }
+
+        private void UpdateSunriseSunsetTicksLayout()
+        {
+            double w = TimelineCanvas.ActualWidth;
+            double h = TimelineCanvas.ActualHeight + 24;
+            if (w <= 0 || h <= 0)
+            {
+                return;
+            }
+
+            void Place(Line tick, TimeSpan t)
+            {
+                double x = Math.Round((t.TotalHours / 24.0) * w);
+                tick.X1 = x;
+                tick.X2 = x;
+                tick.Y1 = 0;
+                tick.Y2 = h;
+            }
+
+            if (_sunriseTick != null)
+            {
+                if (Sunrise.HasValue)
+                {
+                    Place(_sunriseTick, Sunrise.Value);
+                    _sunriseTick.Visibility = Visibility.Visible;
+                }
+                else
+                {
+                    _sunriseTick.Visibility = Visibility.Collapsed;
+                }
+            }
+
+            if (_sunsetTick != null)
+            {
+                if (Sunset.HasValue)
+                {
+                    Place(_sunsetTick, Sunset.Value);
+                    _sunsetTick.Visibility = Visibility.Visible;
+                }
+                else
+                {
+                    _sunsetTick.Visibility = Visibility.Collapsed;
+                }
+            }
+        }
+
+        // ===== Sunrise/Sunset panels (below chart) =====
+        private void EnsureSunPanels()
+        {
+            if (_sunrisePanel == null)
+            {
+                _sunrisePanel = MakeSunPanel("\uEC8A");
+                AnnotationCanvas.Children.Add(_sunrisePanel);
+            }
+
+            if (_sunsetPanel == null)
+            {
+                _sunsetPanel = MakeSunPanel("\uED3A");
+                AnnotationCanvas.Children.Add(_sunsetPanel);
+            }
+        }
+
+        private StackPanel MakeSunPanel(string iconEmoji)
+        {
+            var icon = new FontIcon { Glyph = iconEmoji, Style = (Style)Application.Current.Resources["SunIconStyle"] };
+            var sp = new StackPanel { Orientation = Orientation.Vertical, Spacing = 2 };
+            sp.Children.Add(icon);
+            return sp;
+        }
+
+        private void UpdateSunPanelsLayout()
+        {
+            double timelineW = TimelineCanvas.ActualWidth;
+            double annotationW = AnnotationCanvas.ActualWidth;
+            if (annotationW <= 0)
+            {
+                annotationW = timelineW;
+            }
+
+            if (timelineW <= 0 || annotationW <= 0)
+            {
+                return;
+            }
+
+            void Place(StackPanel sp, TimeSpan t)
+            {
+                double panelW = MeasureElementWidth(sp);
+                double xTimeline = Math.Round((t.TotalHours / 24.0) * timelineW);
+                double left = Clamp(xTimeline - (panelW / 2.0), 0, annotationW - panelW);
+                Canvas.SetLeft(sp, left);
+                Canvas.SetTop(sp, 8);
+            }
+
+            if (_sunrisePanel != null)
+            {
+                if (Sunrise.HasValue)
+                {
+                    ToolTipService.SetToolTip(_sunrisePanel, $"Sunrise: {FormatTime(Sunrise.Value)}");
+                    _sunrisePanel.Visibility = Visibility.Visible;
+                    Place(_sunrisePanel, Sunrise.Value);
+                }
+                else
+                {
+                    ToolTipService.SetToolTip(_sunrisePanel, null);
+                    _sunrisePanel.Visibility = Visibility.Collapsed;
+                }
+            }
+
+            if (_sunsetPanel != null)
+            {
+                if (Sunset.HasValue)
+                {
+                    ToolTipService.SetToolTip(_sunsetPanel, $"Sunset: {FormatTime(Sunset.Value)}");
+                    _sunsetPanel.Visibility = Visibility.Visible;
+                    Place(_sunsetPanel, Sunset.Value);
+                }
+                else
+                {
+                    ToolTipService.SetToolTip(_sunsetPanel, null);
+                    _sunsetPanel.Visibility = Visibility.Collapsed;
+                }
+            }
+        }
+
+        // ===== Major labels BELOW chart (00,06,12,18,24) =====
+        private void EnsureMajorTickLabels()
+        {
+            if (_majorTickBottomLabels.Count > 0)
+            {
+                return;
+            }
+
+            // Includes 24:00 at end
+            for (int i = 0; i < 5; i++)
+            {
+                var tb = new TextBlock { Style = (Style)Application.Current.Resources["MajorTickLabelStyle"] };
+                Canvas.SetZIndex(tb, 5); // on annotation canvas
+                _majorTickBottomLabels.Add(tb);
+                AnnotationCanvas.Children.Add(tb);
+            }
+        }
+
+        private void UpdateMajorTickLabelsLayout()
+        {
+            double timelineW = TimelineCanvas.ActualWidth;
+            double annotationW = AnnotationCanvas.ActualWidth;
+            if (annotationW <= 0)
+            {
+                annotationW = timelineW;
+            }
+
+            if (timelineW <= 0 || annotationW <= 0)
+            {
+                return;
+            }
+
+            int[] hours = { 0, 6, 12, 18, 24 };
+
+            // 1) Place labels first
+            for (int i = 0; i < hours.Length; i++)
+            {
+                var tb = _majorTickBottomLabels[i];
+                var t = TimeSpan.FromHours(hours[i]);
+                tb.Text = FormatTime(t);
+
+                double xTimeline = Math.Round((t.TotalHours / 24.0) * timelineW);
+                double textW = MeasureTextWidth(tb);
+                double left = xTimeline - (textW / 2.0);
+
+                // Middle ones (06, 12) exact center; edges clamp inside canvas
+                if (i == 1 || i == 2)
+                {
+                    Canvas.SetLeft(tb, left);
+                }
+                else
+                {
+                    Canvas.SetLeft(tb, Clamp(left, 0, annotationW - textW));
+                }
+
+                Canvas.SetTop(tb, 8); // your existing baseline below chart
+                tb.Visibility = Visibility.Visible;
+            }
+
+            // 2) Compute sunrise/sunset occupied horizontal ranges (if present)
+            (double Left, double Right)? sunriseBounds = null;
+            (double Left, double Right)? sunsetBounds = null;
+
+            if (Sunrise.HasValue && _sunrisePanel != null)
+            {
+                sunriseBounds = GetAnnotationBoundsForTime(Sunrise.Value, timelineW, annotationW, _sunrisePanel);
+            }
+
+            if (Sunset.HasValue && _sunsetPanel != null)
+            {
+                sunsetBounds = GetAnnotationBoundsForTime(Sunset.Value, timelineW, annotationW, _sunsetPanel);
+            }
+
+            // 3) Hide any label that intersects the sunrise/sunset panel bounds
+            for (int i = 0; i < hours.Length; i++)
+            {
+                var tb = _majorTickBottomLabels[i];
+                if (tb.Visibility != Visibility.Visible)
+                {
+                    continue;
+                }
+
+                var lbl = GetLabelBounds(tb);
+
+                bool hide =
+                    (sunriseBounds.HasValue && Intersects(lbl, sunriseBounds.Value)) ||
+                    (sunsetBounds.HasValue && Intersects(lbl, sunsetBounds.Value)); // include sunset too; remove if you only want sunrise
+
+                tb.Visibility = hide ? Visibility.Collapsed : Visibility.Visible;
+            }
+        }
+
+        // ===== Utilities =====
+        private string FormatTime(TimeSpan ts)
+        {
+            var dt = DateTime.Today.Add(ts);
+            if (_is24h)
+            {
+                if (ts.TotalHours >= 24)
+                {
+                    dt = DateTime.Today; // show 24:00 as 00:00
+                }
+
+                return dt.ToString("HH:mm", CultureInfo.CurrentCulture);
+            }
+            else
+            {
+                return dt.ToString("h:mm", CultureInfo.CurrentCulture)
+                       + dt.ToString("tt", CultureInfo.CurrentCulture).ToUpper(CultureInfo.CurrentCulture);
+            }
+        }
+
+        private static double Clamp(double v, double min, double max) => Math.Max(min, Math.Min(max, v));
+
+        private static double MeasureElementWidth(FrameworkElement el)
+        {
+            el.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+            return el.DesiredSize.Width;
+        }
+
+        private static double MeasureTextWidth(TextBlock tb)
+        {
+            tb.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+            return tb.DesiredSize.Width;
+        }
+
+        private static bool Intersects((double Left, double Right) a, (double Left, double Right) b, double pad = 4)
+        {
+            // Horizontal overlap with padding
+            return !(a.Right + pad <= b.Left || b.Right + pad <= a.Left);
+        }
+
+        private (double Left, double Right) GetAnnotationBoundsForTime(TimeSpan t, double timelineW, double annotationW, FrameworkElement element)
+        {
+            // Compute the *actual* left/right the panel will occupy in AnnotationCanvas
+            double panelW = MeasureElementWidth(element);
+            double xTimeline = Math.Round((t.TotalHours / 24.0) * timelineW);
+            double left = Clamp(xTimeline - (panelW / 2.0), 0, annotationW - panelW);
+            return (left, left + panelW);
+        }
+
+        private (double Left, double Right) GetLabelBounds(TextBlock tb)
+        {
+            double w = MeasureTextWidth(tb);
+            double left = Canvas.GetLeft(tb);
+            return (left, left + w);
+        }
+    }
+}

src/settings-ui/Settings.UI/SettingsXAML/Controls/Timeline/TimelineStyles.xaml

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <Style x:Key="HourTickStyle" TargetType="Line">
+        <Setter Property="Stroke" Value="{ThemeResource TextFillColorTertiaryBrush}" />
+        <Setter Property="StrokeThickness" Value="1" />
+    </Style>
+
+    <Style
+        x:Key="MajorHourTickStyle"
+        BasedOn="{StaticResource HourTickStyle}"
+        TargetType="Line">
+        <Setter Property="StrokeThickness" Value="2" />
+        <Setter Property="Stroke" Value="{ThemeResource TextFillColorTertiaryBrush}" />
+    </Style>
+
+    <Style x:Key="SunRiseMarkerTickStyle" TargetType="Line">
+        <Setter Property="Stroke" Value="{ThemeResource TextFillColorTertiaryBrush}" />
+        <Setter Property="StrokeThickness" Value="1" />
+        <Setter Property="StrokeDashArray" Value="2,2" />
+    </Style>
+
+
+    <Style x:Key="SunSetMarkerTickStyle" TargetType="Line">
+        <Setter Property="Stroke" Value="{ThemeResource TextFillColorTertiaryBrush}" />
+        <Setter Property="StrokeThickness" Value="1" />
+        <Setter Property="StrokeDashArray" Value="2,2" />
+    </Style>
+
+    <!--  ===== Text / Labels =====  -->
+    <Style x:Key="EdgeLabelStyle" TargetType="TextBlock">
+        <Setter Property="FontSize" Value="14" />
+        <Setter Property="FontWeight" Value="SemiBold" />
+        <Setter Property="Foreground" Value="{ThemeResource AccentTextFillColorPrimaryBrush}" />
+        <Setter Property="IsHitTestVisible" Value="False" />
+    </Style>
+
+    <!--  Below-chart labels for 00/06/12/18/24  -->
+    <Style x:Key="MajorTickLabelStyle" TargetType="TextBlock">
+        <Setter Property="FontSize" Value="12" />
+        <Setter Property="Foreground" Value="{ThemeResource TextFillColorTertiaryBrush}" />
+        <Setter Property="IsHitTestVisible" Value="False" />
+    </Style>
+
+    <!--  Sunrise/Sunset panel styles  -->
+    <Style x:Key="SunIconStyle" TargetType="FontIcon">
+        <Setter Property="FontSize" Value="18" />
+        <Setter Property="Foreground" Value="{ThemeResource TextFillColorTertiaryBrush}" />
+        <Setter Property="HorizontalAlignment" Value="Center" />
+    </Style>
+
+    <!--  ===== Bands =====  -->
+    <Style x:Key="DarkBandStyle" TargetType="Border">
+        <Setter Property="Background" Value="{ThemeResource AccentFillColorDefaultBrush}" />
+        <Setter Property="CornerRadius" Value="8" />
+        <Setter Property="Padding" Value="4" />
+        <Setter Property="ToolTipService.ToolTip" Value="Dark mode" />
+    </Style>
+
+    <Style x:Key="LightBandStyle" TargetType="Border">
+        <Setter Property="Background" Value="{ThemeResource CardBackgroundFillColorDefaultBrush}" />
+        <Setter Property="ToolTipService.ToolTip" Value="Light mode" />
+    </Style>
+
+    <Style x:Key="DarkBandIconStyle" TargetType="FontIcon">
+        <Setter Property="FontSize" Value="14" />
+        <Setter Property="Glyph" Value="&#xE793;" />
+        <Setter Property="Foreground" Value="{ThemeResource TextOnAccentFillColorPrimaryBrush}" />
+        <Setter Property="HorizontalAlignment" Value="Center" />
+    </Style>
+    <Style
+        x:Key="LightBandIconStyle"
+        BasedOn="{StaticResource DarkBandIconStyle}"
+        TargetType="FontIcon">
+        <Setter Property="Glyph" Value="&#xE706;" />
+        <Setter Property="Foreground" Value="{ThemeResource TextFillColorSecondaryBrush}" />
+    </Style>
+
+</ResourceDictionary>

src/settings-ui/Settings.UI/SettingsXAML/Views/LightSwitchPage.xaml

@@ -0,0 +1,301 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<Page
+    x:Class="Microsoft.PowerToys.Settings.UI.Views.LightSwitchPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:ViewModel="using:Microsoft.PowerToys.Settings.UI.ViewModels"
+    xmlns:animations="using:CommunityToolkit.WinUI.Animations"
+    xmlns:controls="using:Microsoft.PowerToys.Settings.UI.Controls"
+    xmlns:converters="using:Microsoft.PowerToys.Settings.UI.Converters"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:helpers="using:Settings.UI.Library.Helpers"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
+    xmlns:tkconverters="using:CommunityToolkit.WinUI.Converters"
+    xmlns:ui="using:CommunityToolkit.WinUI"
+    d:DataContext="{d:DesignInstance Type=ViewModel:LightSwitchViewModel}"
+    AutomationProperties.LandmarkType="Main"
+    mc:Ignorable="d">
+  <Page.Resources>
+    <converters:EnumToVisibilityConverter x:Key="EnumToVisibilityConverter" />
+    <animations:ImplicitAnimationSet x:Name="ShowTransitions">
+      <animations:OffsetAnimation
+                EasingMode="EaseOut"
+                From="0,24,0"
+                To="0"
+                Duration="0:0:0.4" />
+      <animations:OpacityAnimation
+                EasingMode="EaseOut"
+                From="0"
+                To="1"
+                Duration="0:0:0.2" />
+    </animations:ImplicitAnimationSet>
+    <animations:ImplicitAnimationSet x:Name="HideTransitions">
+      <animations:OffsetAnimation
+                EasingMode="EaseOut"
+                From="0"
+                To="0,24,0"
+                Duration="0:0:0.2" />
+      <animations:OpacityAnimation
+                EasingMode="EaseOut"
+                From="1"
+                To="0"
+                Duration="0:0:0.1" />
+    </animations:ImplicitAnimationSet>
+  </Page.Resources>
+
+  <controls:SettingsPageControl
+        x:Uid="LightSwitch"
+        IsTabStop="False"
+        ModuleImageSource="ms-appx:///Assets/Settings/Modules/Awake.png">
+    <controls:SettingsPageControl.ModuleContent>
+      <StackPanel Orientation="Vertical">
+        <tkcontrols:SettingsCard
+                    Header="Enable LightSwitch"
+                    HeaderIcon="{ui:BitmapIcon Source=/Assets/Settings/Icons/LightSwitch.png}"
+                    IsEnabled="{x:Bind ViewModel.IsEnabledGpoConfigured, Mode=OneWay, Converter={StaticResource BoolNegationConverter}}">
+          <ToggleSwitch IsOn="{x:Bind ViewModel.IsEnabled, Mode=TwoWay}" />
+        </tkcontrols:SettingsCard>
+
+        <InfoBar
+                    x:Uid="GPO_SettingIsManaged"
+                    IsClosable="False"
+                    IsOpen="{x:Bind ViewModel.IsEnabledGpoConfigured, Mode=OneWay}"
+                    IsTabStop="{x:Bind ViewModel.IsEnabledGpoConfigured, Mode=OneWay}"
+                    Severity="Informational" />
+
+        <controls:SettingsGroup Header="Shortcuts" IsEnabled="{x:Bind ViewModel.IsEnabled, Mode=OneWay}">
+          <tkcontrols:SettingsCard x:Uid="LightSwitch_ThemeToggle_Shortcut" HeaderIcon="{ui:FontIcon Glyph=&#xE708;}">
+            <controls:ShortcutControl
+             MinWidth="{StaticResource SettingActionControlMinWidth}"
+             AllowDisable="True"
+             HotkeySettings="{x:Bind Path=ViewModel.ToggleThemeActivationShortcut, Mode=TwoWay}" />
+          </tkcontrols:SettingsCard>
+        </controls:SettingsGroup>
+
+        <controls:SettingsGroup Header="Schedule" IsEnabled="{x:Bind ViewModel.IsEnabled, Mode=OneWay}">
+          <tkcontrols:SettingsCard
+                        HorizontalContentAlignment="Stretch"
+                        ContentAlignment="Vertical"
+                        Description="See when dark mode and light mode kick in"
+                        Header="Schedule preview">
+            <controls:Timeline
+                            Margin="0,48,0,48"
+                            EndTime="{x:Bind ViewModel.DarkTimeTimeSpan, Mode=OneWay}"
+                            StartTime="{x:Bind ViewModel.LightTimeTimeSpan, Mode=OneWay}"
+                            Sunrise="07:00"
+                            Sunset="21:00" />
+          </tkcontrols:SettingsCard>
+
+          <tkcontrols:SettingsExpander
+                        Description="Determine when dark mode should be turned on"
+                        Header="Set schedule"
+                        HeaderIcon="{ui:FontIcon Glyph=&#xE823;}"
+                        IsExpanded="True">
+            <ComboBox
+                            SelectedValue="{x:Bind ViewModel.ScheduleMode, Mode=TwoWay}"
+                            SelectedValuePath="Tag"
+                            SelectionChanged="ScheduleMode_SelectionChanged">
+              <ComboBoxItem Content="Manual" Tag="FixedHours" />
+              <ComboBoxItem Content="Sunset to sunrise" Tag="SunsetToSunriseGeo" />
+            </ComboBox>
+            <tkcontrols:SettingsExpander.Items>
+              <tkcontrols:SettingsCard Header="Turn off dark mode" Visibility="{x:Bind ViewModel.ScheduleMode, Mode=OneWay, Converter={StaticResource EnumToVisibilityConverter}, ConverterParameter=FixedHours}">
+                <TimePicker ClockIdentifier="24HourClock" Time="{x:Bind ViewModel.LightTimeTimeSpan, Mode=TwoWay}" />
+              </tkcontrols:SettingsCard>
+              <tkcontrols:SettingsCard Header="Turn on dark mode" Visibility="{x:Bind ViewModel.ScheduleMode, Mode=OneWay, Converter={StaticResource EnumToVisibilityConverter}, ConverterParameter=FixedHours}">
+                <TimePicker ClockIdentifier="24HourClock" Time="{x:Bind ViewModel.DarkTimeTimeSpan, Mode=TwoWay}" />
+              </tkcontrols:SettingsCard>
+              <tkcontrols:SettingsCard Header="Sunrise and sunset times" Description="Calculated by the selected location" Visibility="{x:Bind ViewModel.ScheduleMode, Mode=OneWay, Converter={StaticResource EnumToVisibilityConverter}, ConverterParameter=SunsetToSunriseGeo}">
+                <StackPanel Orientation="Horizontal" Spacing="8">
+                  <TextBlock
+                                        VerticalAlignment="Center"
+                                        Foreground="{ThemeResource TextFillColorSecondaryBrush}"
+                                        Text="Please sync your location" />
+                  <Button Click="SyncLocationButton_Click" Content="Sync" />
+                </StackPanel>
+              </tkcontrols:SettingsCard>
+              <tkcontrols:SettingsCard
+                                Description="Adjust the trigger time by starting earlier or later than the actual sunrise or sunset"
+                                Header="Sunrise or sunset offset"
+                                Visibility="{x:Bind ViewModel.ScheduleMode, Mode=OneWay, Converter={StaticResource EnumToVisibilityConverter}, ConverterParameter=SunsetToSunriseGeo}">
+                <Grid VerticalAlignment="Center" ColumnSpacing="8">
+                  <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="Auto" />
+                  </Grid.ColumnDefinitions>
+                  <Slider
+                                        x:Name="geoOffsetSlider"
+                                        MinWidth="132"
+                                        Maximum="60"
+                                        Minimum="-60"
+                                        SnapsTo="StepValues"
+                                        TickFrequency="15"
+                                        TickPlacement="Outside"
+                                        Value="{x:Bind ViewModel.Offset, Mode=TwoWay}" />
+
+                  <TextBlock
+                                        Grid.Column="1"
+                                        MinWidth="78"
+                                        VerticalAlignment="Center"
+                                        Foreground="{ThemeResource TextFillColorSecondaryBrush}"
+                                        TextAlignment="Right">
+                                        <Run x:Name="geoOffsetValue" Text="{x:Bind ViewModel.Offset, Mode=OneWay}" />
+                                        <Run Text="minutes" />
+                  </TextBlock>
+
+                </Grid>
+              </tkcontrols:SettingsCard>
+
+              <tkcontrols:SettingsCard Header="Apply an offset in minutes" Visibility="{x:Bind ViewModel.ScheduleMode, Mode=OneWay, Converter={StaticResource EnumToVisibilityConverter}, ConverterParameter=SunsetToSunriseUser}">
+                <Grid VerticalAlignment="Center">
+                  <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="Auto" />
+                  </Grid.ColumnDefinitions>
+                  <Slider
+                                        x:Name="useroffsetSlider"
+                                        Grid.Column="0"
+                                        Maximum="60"
+                                        Minimum="-60"
+                                        SnapsTo="StepValues"
+                                        TickFrequency="15"
+                                        TickPlacement="Outside"
+                                        Value="{x:Bind ViewModel.Offset, Mode=TwoWay}" />
+                  <TextBlock
+                                        x:Name="userOffsetValue"
+                                        Grid.Column="1"
+                                        Margin="10,0,0,0"
+                                        VerticalAlignment="Center"
+                                        FontSize="12"
+                                        Foreground="{ThemeResource TextFillColorSecondaryBrush}"
+                                        Text="{x:Bind ViewModel.Offset, Mode=OneWay}" />
+                </Grid>
+              </tkcontrols:SettingsCard>
+            </tkcontrols:SettingsExpander.Items>
+          </tkcontrols:SettingsExpander>
+
+          <controls:SettingsGroup Header="Behavior" IsEnabled="{x:Bind ViewModel.IsEnabled, Mode=OneWay}">
+            <tkcontrols:SettingsExpander
+                            Description="Pick which parts of your PC should follow Light Switch"
+                            Header="Apply dark mode to"
+                            HeaderIcon="{ui:FontIcon Glyph=&#xE790;}"
+                            IsExpanded="True">
+              <tkcontrols:SettingsExpander.Items>
+                <tkcontrols:SettingsCard HorizontalContentAlignment="Stretch" ContentAlignment="Left">
+                  <controls:CheckBoxWithDescriptionControl
+                                        Description="Taskbar, Start, and other system UI"
+                                        Header="System"
+                                        IsChecked="{x:Bind ViewModel.ChangeSystem, Mode=TwoWay}" />
+                </tkcontrols:SettingsCard>
+                <tkcontrols:SettingsCard HorizontalContentAlignment="Stretch" ContentAlignment="Left">
+                  <controls:CheckBoxWithDescriptionControl
+                                        Description="Supported applications"
+                                        Header="Apps"
+                                        IsChecked="{x:Bind ViewModel.ChangeApps, Mode=TwoWay}" />
+                </tkcontrols:SettingsCard>
+              </tkcontrols:SettingsExpander.Items>
+            </tkcontrols:SettingsExpander>
+          </controls:SettingsGroup>
+          <!--  Force mode buttons  -->
+          <!--<tkcontrols:SettingsCard
+        Header="Force mode now"
+        HeaderIcon="{ui:FontIcon Glyph=&#xE706;}"
+        Description="Apply light or dark mode immediately">
+            <StackPanel Orientation="Horizontal" Spacing="12">
+              <Button
+        Content="Force Light"
+        Command="{x:Bind ViewModel.ForceLightCommand}" />
+              <Button
+        Content="Force Dark"
+        Command="{x:Bind ViewModel.ForceDarkCommand}" />
+            </StackPanel>
+          </tkcontrols:SettingsCard>-->
+
+          <ContentDialog
+                        x:Name="LocationDialog"
+                        Title="Select a location"
+                        IsPrimaryButtonEnabled="True"
+                        IsSecondaryButtonEnabled="True"
+                        PrimaryButtonStyle="{StaticResource AccentButtonStyle}"
+                        PrimaryButtonText="Select"
+                        SecondaryButtonText="Cancel">
+            <Grid MinHeight="268">
+              <Grid.RowDefinitions>
+                <RowDefinition Height="Auto" />
+                <RowDefinition Height="Auto" />
+                <RowDefinition Height="*" />
+              </Grid.RowDefinitions>
+              <TextBlock Foreground="{ThemeResource TextFillColorSecondaryBrush}" Text="To calculate the sunrise and sunset, enter a location to be used." />
+              <tkcontrols:Segmented
+                                x:Name="locationSegmented"
+                                Grid.Row="1"
+                                Margin="0,16,0,12"
+                                HorizontalAlignment="Stretch"
+                                SelectedIndex="0">
+                <tkcontrols:SegmentedItem Content="Find my location" Tag="Auto" />
+                <tkcontrols:SegmentedItem Content="Select a city" Tag="Selection" />
+              </tkcontrols:Segmented>
+              <tkcontrols:SwitchPresenter Grid.Row="2" Value="{Binding SelectedItem.Tag, ElementName=locationSegmented}">
+                <tkcontrols:Case Value="Auto">
+                  <Grid animations:Implicit.HideAnimations="{StaticResource HideTransitions}" animations:Implicit.ShowAnimations="{StaticResource ShowTransitions}">
+                    <Grid.RowDefinitions>
+                      <RowDefinition Height="*" />
+                      <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+                    <StackPanel
+                      Grid.Row="0"
+                                                HorizontalAlignment="Center"
+                                                VerticalAlignment="Center"
+                                                Orientation="Horizontal"
+                                                Spacing="8">
+                      <ProgressRing
+                                                    x:Name="SyncLoader"
+                                                    Width="16"
+                                                    Height="16"
+                                                    IsActive="False"
+                                                    Visibility="Collapsed" />
+                      <Button
+                                                    x:Name="SyncButton"
+                                                    HorizontalAlignment="Right"
+                                                    Click="GetLocation_Click"
+                                                    Content="Sync" />
+                    </StackPanel>
+                    <TextBlock Grid.Row="1">
+                      <Run Text="{x:Bind ViewModel.CityTimesText, Mode=OneWay}" />
+                    </TextBlock>
+                  </Grid>
+                </tkcontrols:Case>
+                <tkcontrols:Case Value="Selection">
+                  <Grid animations:Implicit.HideAnimations="{StaticResource HideTransitions}" animations:Implicit.ShowAnimations="{StaticResource ShowTransitions}">
+                    <Grid.RowDefinitions>
+                      <RowDefinition Height="*" />
+                      <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+                    <ComboBox
+                                            x:Name="CityComboBox"
+                                            Margin="0,0,0,8"
+                                            HorizontalAlignment="Stretch"
+                                            DisplayMemberPath="Display"
+                                            Header="Search for a city"
+                                            ItemsSource="{x:Bind ViewModel.Cities, Mode=OneWay}"
+                                            PlaceholderText="Select city"
+                                            SelectedItem="{x:Bind ViewModel.SelectedCity, Mode=TwoWay}">
+                    </ComboBox>
+                    <TextBlock Grid.Row="1">
+                      <Run Text="{x:Bind ViewModel.CityTimesText, Mode=OneWay}" />
+                    </TextBlock>
+                  </Grid>
+                </tkcontrols:Case>
+              </tkcontrols:SwitchPresenter>
+            </Grid>
+          </ContentDialog>
+        </controls:SettingsGroup>
+      </StackPanel>
+    </controls:SettingsPageControl.ModuleContent>
+
+    <controls:SettingsPageControl.PrimaryLinks>
+      <controls:PageLink x:Uid="LearnMore_LightSwitch" Link="https://aka.ms/PowerToysOverview_ZoomIt" />
+    </controls:SettingsPageControl.PrimaryLinks>
+  </controls:SettingsPageControl>
+</Page>

src/settings-ui/Settings.UI/SettingsXAML/Views/LightSwitchPage.xaml.cs

@@ -0,0 +1,277 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Globalization;
+using System.IO;
+using System.IO.Abstractions;
+using System.Linq;
+using ManagedCommon;
+using Microsoft.PowerToys.Settings.UI.Helpers;
+using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.Library.Helpers;
+using Microsoft.PowerToys.Settings.UI.Library.Interfaces;
+using Microsoft.PowerToys.Settings.UI.ViewModels;
+using Microsoft.UI.Dispatching;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using PowerToys.GPOWrapper;
+using Settings.UI.Library;
+using Windows.Devices.Geolocation;
+
+namespace Microsoft.PowerToys.Settings.UI.Views
+{
+    public sealed partial class LightSwitchPage : Page
+    {
+        private readonly string _appName = "LightSwitch";
+        private readonly SettingsUtils _settingsUtils;
+        private readonly Func<string, int> _sendConfigMsg = ShellPage.SendDefaultIPCMessage;
+
+        private readonly ISettingsRepository<GeneralSettings> _generalSettingsRepository;
+        private readonly ISettingsRepository<LightSwitchSettings> _moduleSettingsRepository;
+
+        private readonly IFileSystem _fileSystem;
+        private readonly IFileSystemWatcher _fileSystemWatcher;
+        private readonly DispatcherQueue _dispatcherQueue;
+
+        private LightSwitchViewModel ViewModel { get; set; }
+
+        public LightSwitchPage()
+        {
+            _settingsUtils = new SettingsUtils();
+            _sendConfigMsg = ShellPage.SendDefaultIPCMessage;
+
+            _generalSettingsRepository = SettingsRepository<GeneralSettings>.GetInstance(_settingsUtils);
+            _moduleSettingsRepository = SettingsRepository<LightSwitchSettings>.GetInstance(_settingsUtils);
+
+            // Get settings from JSON (or defaults if JSON missing)
+            var darkSettings = _moduleSettingsRepository.SettingsConfig;
+
+            // Pass them into the ViewModel
+            ViewModel = new LightSwitchViewModel(darkSettings, ShellPage.SendDefaultIPCMessage);
+            ViewModel.PropertyChanged += ViewModel_PropertyChanged;
+
+            LoadSettings(_generalSettingsRepository, _moduleSettingsRepository);
+
+            DataContext = ViewModel;
+
+            var settingsPath = _settingsUtils.GetSettingsFilePath(_appName);
+
+            _dispatcherQueue = DispatcherQueue.GetForCurrentThread();
+            _fileSystem = new FileSystem();
+
+            _fileSystemWatcher = _fileSystem.FileSystemWatcher.New();
+            _fileSystemWatcher.Path = _fileSystem.Path.GetDirectoryName(settingsPath);
+            _fileSystemWatcher.Filter = _fileSystem.Path.GetFileName(settingsPath);
+            _fileSystemWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.CreationTime;
+            _fileSystemWatcher.Changed += Settings_Changed;
+            _fileSystemWatcher.EnableRaisingEvents = true;
+
+            this.InitializeComponent();
+            this.Loaded += LightSwitchPage_Loaded;
+        }
+
+        private void LightSwitchPage_Loaded(object sender, RoutedEventArgs e)
+        {
+            if (ViewModel.Cities.Count == 0)
+            {
+                string csvPath = Path.Combine(AppContext.BaseDirectory, "Assets/world_cities.csv");
+                System.Diagnostics.Debug.WriteLine($"Looking for world_cities.csv at: {csvPath}");
+                if (File.Exists(csvPath))
+                {
+                    foreach (var city in CityLoader.LoadCities(csvPath))
+                    {
+                        ViewModel.Cities.Add(city);
+                    }
+                }
+                else
+                {
+                    System.Diagnostics.Debug.WriteLine("world_cities.csv not found.");
+                }
+            }
+
+            if (ViewModel.ScheduleMode == "SunsetToSunriseUser" &&
+                double.TryParse(ViewModel.Latitude, NumberStyles.Float, CultureInfo.InvariantCulture, out double savedLat) &&
+                double.TryParse(ViewModel.Longitude, NumberStyles.Float, CultureInfo.InvariantCulture, out double savedLng))
+            {
+                var match = ViewModel.Cities.FirstOrDefault(c =>
+                    Math.Abs(c.Latitude - savedLat) < 0.0001 &&
+                    Math.Abs(c.Longitude - savedLng) < 0.0001);
+
+                if (match != null)
+                {
+                    ViewModel.SelectedCity = match;
+                }
+            }
+        }
+
+        private async void GetLocation_Click(object sender, RoutedEventArgs e)
+        {
+            SyncButton.IsEnabled = false;
+            SyncLoader.IsActive = true;
+            SyncLoader.Visibility = Visibility.Visible;
+
+            try
+            {
+                // Request access
+                var accessStatus = await Geolocator.RequestAccessAsync();
+                if (accessStatus != GeolocationAccessStatus.Allowed)
+                {
+                    // User denied location or it's not available
+                    return;
+                }
+
+                var geolocator = new Geolocator { DesiredAccuracy = PositionAccuracy.Default };
+
+                Geoposition pos = await geolocator.GetGeopositionAsync();
+
+                double latitude = Math.Round(pos.Coordinate.Point.Position.Latitude);
+                double longitude = Math.Round(pos.Coordinate.Point.Position.Longitude);
+
+                SunTimes result = SunCalc.CalculateSunriseSunset(
+                    latitude,
+                    longitude,
+                    DateTime.Now.Year,
+                    DateTime.Now.Month,
+                    DateTime.Now.Day);
+
+                ViewModel.LightTime = (result.SunriseHour * 60) + result.SunriseMinute;
+                ViewModel.DarkTime = (result.SunsetHour * 60) + result.SunsetMinute;
+
+                ViewModel.CityTimesText = $"Sunrise: {result.SunriseHour}:{result.SunriseMinute:D2}\n" +
+                            $"Sunset: {result.SunsetHour}:{result.SunsetMinute:D2}";
+
+                SyncButton.IsEnabled = true;
+                SyncLoader.IsActive = false;
+                SyncLoader.Visibility = Visibility.Collapsed;
+            }
+            catch (Exception ex)
+            {
+                SyncButton.IsEnabled = true;
+                SyncLoader.IsActive = false;
+                System.Diagnostics.Debug.WriteLine("Location error: " + ex.Message);
+            }
+        }
+
+        private void ScheduleMode_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            var combo = (ComboBox)sender;
+            var selectedTag = (combo.SelectedItem as ComboBoxItem)?.Tag?.ToString();
+
+            if (selectedTag == "FixedHours")
+            {
+                ViewModel.LightTime = 360;
+                ViewModel.DarkTime = 1080;
+            }
+        }
+
+        private void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == "IsEnabled")
+            {
+                if (ViewModel.IsEnabled != _generalSettingsRepository.SettingsConfig.Enabled.LightSwitch)
+                {
+                    _generalSettingsRepository.SettingsConfig.Enabled.LightSwitch = ViewModel.IsEnabled;
+
+                    var generalSettingsMessage = new OutGoingGeneralSettings(_generalSettingsRepository.SettingsConfig).ToString();
+                    Logger.LogInfo($"Saved general settings from Light Switch page.");
+
+                    _sendConfigMsg?.Invoke(generalSettingsMessage);
+                }
+            }
+            else
+            {
+                if (ViewModel.ModuleSettings != null)
+                {
+                    SndLightSwitchSettings currentSettings = new(_moduleSettingsRepository.SettingsConfig);
+                    SndModuleSettings<SndLightSwitchSettings> csIpcMessage = new(currentSettings);
+
+                    SndLightSwitchSettings outSettings = new(ViewModel.ModuleSettings);
+                    SndModuleSettings<SndLightSwitchSettings> outIpcMessage = new(outSettings);
+
+                    string csMessage = csIpcMessage.ToJsonString();
+                    string outMessage = outIpcMessage.ToJsonString();
+
+                    if (!csMessage.Equals(outMessage, StringComparison.Ordinal))
+                    {
+                        Logger.LogInfo($"Saved Light Switch settings from Light Switch page.");
+
+                        _sendConfigMsg?.Invoke(outMessage);
+                    }
+                }
+            }
+        }
+
+        private void LoadSettings(ISettingsRepository<GeneralSettings> generalSettingsRepository, ISettingsRepository<LightSwitchSettings> moduleSettingsRepository)
+        {
+            if (generalSettingsRepository != null)
+            {
+                if (moduleSettingsRepository != null)
+                {
+                    UpdateViewModelSettings(moduleSettingsRepository.SettingsConfig, generalSettingsRepository.SettingsConfig);
+                }
+                else
+                {
+                    throw new ArgumentNullException(nameof(moduleSettingsRepository));
+                }
+            }
+            else
+            {
+                throw new ArgumentNullException(nameof(generalSettingsRepository));
+            }
+        }
+
+        private void UpdateViewModelSettings(LightSwitchSettings lightSwitchSettings, GeneralSettings generalSettings)
+        {
+            if (lightSwitchSettings != null)
+            {
+                if (generalSettings != null)
+                {
+                    ViewModel.IsEnabled = generalSettings.Enabled.LightSwitch;
+                    ViewModel.ModuleSettings = (LightSwitchSettings)lightSwitchSettings.Clone();
+
+                    UpdateEnabledState(generalSettings.Enabled.LightSwitch);
+                }
+                else
+                {
+                    throw new ArgumentNullException(nameof(generalSettings));
+                }
+            }
+            else
+            {
+                throw new ArgumentNullException(nameof(lightSwitchSettings));
+            }
+        }
+
+        private void Settings_Changed(object sender, FileSystemEventArgs e)
+        {
+            _dispatcherQueue.TryEnqueue(() =>
+            {
+                _moduleSettingsRepository.ReloadSettings();
+                LoadSettings(_generalSettingsRepository, _moduleSettingsRepository);
+            });
+        }
+
+        private void UpdateEnabledState(bool recommendedState)
+        {
+            var enabledGpoRuleConfiguration = GPOWrapper.GetConfiguredLightSwitchEnabledValue();
+
+            if (enabledGpoRuleConfiguration == GpoRuleConfigured.Disabled || enabledGpoRuleConfiguration == GpoRuleConfigured.Enabled)
+            {
+                // Get the enabled state from GPO.
+                ViewModel.IsEnabledGpoConfigured = true;
+                ViewModel.EnabledGPOConfiguration = enabledGpoRuleConfiguration == GpoRuleConfigured.Enabled;
+            }
+            else
+            {
+                ViewModel.IsEnabled = recommendedState;
+            }
+        }
+
+        private async void SyncLocationButton_Click(object sender, RoutedEventArgs e)
+        {
+            await LocationDialog.ShowAsync();
+        }
+    }
+}

src/settings-ui/Settings.UI/SettingsXAML/Views/RegistryPreviewPage.xaml

@@ -49,10 +49,8 @@
                         <ToggleSwitch x:Uid="RegistryPreview_DefaultRegApp_ToggleSwitch" IsOn="{x:Bind ViewModel.IsRegistryPreviewDefaultRegApp, Mode=TwoWay}" />
                     </tkcontrols:SettingsCard>
                 </controls:SettingsGroup>
-
             </StackPanel>
         </controls:SettingsPageControl.ModuleContent>
-
         <controls:SettingsPageControl.PrimaryLinks>
             <controls:PageLink x:Uid="LearnMore_RegistryPreview" Link="https://aka.ms/PowerToysOverview_RegistryPreview" />
         </controls:SettingsPageControl.PrimaryLinks>

src/settings-ui/Settings.UI/SettingsXAML/Views/ShellPage.xaml

@@ -18,91 +18,91 @@
     HighContrastAdjustment="None"
     Loaded="ShellPage_Loaded"
     mc:Ignorable="d">
-    <UserControl.Resources>
-        <converters:IconConverter x:Key="IconConverter" />
-        <converters:SearchSuggestionTemplateSelector
+  <UserControl.Resources>
+    <converters:IconConverter x:Key="IconConverter" />
+    <converters:SearchSuggestionTemplateSelector
             x:Key="SearchSuggestionTemplateSelector"
             DefaultSuggestionTemplate="{StaticResource DefaultSearchResultTemplate}"
             NoResultsSuggestionTemplate="{StaticResource NoResultSearchResultTemplate}"
             ShowAllSuggestionTemplate="{StaticResource ShowAllSearchResultTemplate}" />
-        <DataTemplate x:Key="DefaultSearchResultTemplate" x:DataType="models:SuggestionItem">
-            <Grid Padding="16,8">
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="Auto" />
-                    <ColumnDefinition Width="*" />
-                </Grid.ColumnDefinitions>
-                <Viewbox
+    <DataTemplate x:Key="DefaultSearchResultTemplate" x:DataType="models:SuggestionItem">
+      <Grid Padding="16,8">
+        <Grid.ColumnDefinitions>
+          <ColumnDefinition Width="Auto" />
+          <ColumnDefinition Width="*" />
+        </Grid.ColumnDefinitions>
+        <Viewbox
                     Width="16"
                     Height="16"
                     HorizontalAlignment="Center"
                     VerticalAlignment="Center"
                     Stretch="Uniform">
-                    <ContentPresenter
+          <ContentPresenter
                         HorizontalAlignment="Center"
                         VerticalAlignment="Center"
                         Content="{x:Bind Icon, Converter={StaticResource IconConverter}, ConverterParameter=&#xE713;}" />
-                </Viewbox>
-                <StackPanel
+        </Viewbox>
+        <StackPanel
                     Grid.Column="1"
                     Margin="12,0,0,0"
                     VerticalAlignment="Center">
-                    <TextBlock Text="{x:Bind Header}" />
-                    <TextBlock
+          <TextBlock Text="{x:Bind Header}" />
+          <TextBlock
                         FontSize="12"
                         Foreground="{ThemeResource TextFillColorSecondaryBrush}"
                         Text="{x:Bind Subtitle}"
                         Visibility="{x:Bind Subtitle, Converter={StaticResource StringVisibilityConverter}}" />
-                </StackPanel>
-            </Grid>
-        </DataTemplate>
-        <DataTemplate x:Key="NoResultSearchResultTemplate" x:DataType="models:SuggestionItem">
-            <Grid>
-                <TextBlock
+        </StackPanel>
+      </Grid>
+    </DataTemplate>
+    <DataTemplate x:Key="NoResultSearchResultTemplate" x:DataType="models:SuggestionItem">
+      <Grid>
+        <TextBlock
                     Margin="8"
                     HorizontalAlignment="Center"
                     Text="{x:Bind Header}"
                     TextAlignment="Center" />
-            </Grid>
-        </DataTemplate>
-        <DataTemplate x:Key="ShowAllSearchResultTemplate" x:DataType="models:SuggestionItem">
-            <Grid>
-                <Rectangle
+      </Grid>
+    </DataTemplate>
+    <DataTemplate x:Key="ShowAllSearchResultTemplate" x:DataType="models:SuggestionItem">
+      <Grid>
+        <Rectangle
                     Height="1"
                     Margin="0,-12,0,0"
                     HorizontalAlignment="Stretch"
                     VerticalAlignment="Top"
                     Fill="{ThemeResource DividerStrokeColorDefaultBrush}" />
-                <TextBlock
+        <TextBlock
                     x:Uid="Shell_Search_ShowAll"
                     HorizontalAlignment="Stretch"
                     VerticalAlignment="Center"
                     Text="Show all results"
                     TextAlignment="Center" />
-            </Grid>
-        </DataTemplate>
-    </UserControl.Resources>
-    <i:Interaction.Behaviors>
-        <ic:EventTriggerBehavior EventName="Loaded">
-            <ic:InvokeCommandAction Command="{x:Bind ViewModel.LoadedCommand}" />
-        </ic:EventTriggerBehavior>
-    </i:Interaction.Behaviors>
-    <Grid x:Name="RootGrid">
-        <Grid.RowDefinitions>
-            <RowDefinition Height="48" />
-            <RowDefinition Height="*" />
-        </Grid.RowDefinitions>
-        <controls:TitleBar
+      </Grid>
+    </DataTemplate>
+  </UserControl.Resources>
+  <i:Interaction.Behaviors>
+    <ic:EventTriggerBehavior EventName="Loaded">
+      <ic:InvokeCommandAction Command="{x:Bind ViewModel.LoadedCommand}" />
+    </ic:EventTriggerBehavior>
+  </i:Interaction.Behaviors>
+  <Grid x:Name="RootGrid">
+    <Grid.RowDefinitions>
+      <RowDefinition Height="48" />
+      <RowDefinition Height="*" />
+    </Grid.RowDefinitions>
+    <controls:TitleBar
             x:Name="AppTitleBar"
             AutoConfigureCustomTitleBar="True"
             PaneButtonClick="PaneToggleBtn_Click">
-            <controls:TitleBar.Resources>
-                <x:Double x:Key="TitleBarContentMinWidth">516</x:Double>
-            </controls:TitleBar.Resources>
-            <controls:TitleBar.Icon>
-                <BitmapIcon ShowAsMonochrome="False" UriSource="/Assets/Settings/icon.ico" />
-            </controls:TitleBar.Icon>
-            <controls:TitleBar.Content>
-                <AutoSuggestBox
+      <controls:TitleBar.Resources>
+        <x:Double x:Key="TitleBarContentMinWidth">516</x:Double>
+      </controls:TitleBar.Resources>
+      <controls:TitleBar.Icon>
+        <BitmapIcon ShowAsMonochrome="False" UriSource="/Assets/Settings/icon.ico" />
+      </controls:TitleBar.Icon>
+      <controls:TitleBar.Content>
+        <AutoSuggestBox
                     x:Name="SearchBox"
                     x:Uid="Shell_SearchBox"
                     HorizontalAlignment="Stretch"
@@ -115,16 +115,16 @@
                     TextChanged="SearchBox_TextChanged"
                     TextMemberPath="Header"
                     UpdateTextOnSelect="False">
-                    <AutoSuggestBox.KeyboardAccelerators>
-                        <KeyboardAccelerator
+          <AutoSuggestBox.KeyboardAccelerators>
+            <KeyboardAccelerator
                             Key="F"
                             Invoked="CtrlF_Invoked"
                             Modifiers="Control" />
-                    </AutoSuggestBox.KeyboardAccelerators>
-                </AutoSuggestBox>
-            </controls:TitleBar.Content>
-        </controls:TitleBar>
-        <NavigationView
+          </AutoSuggestBox.KeyboardAccelerators>
+        </AutoSuggestBox>
+      </controls:TitleBar.Content>
+    </controls:TitleBar>
+    <NavigationView
             x:Name="navigationView"
             Grid.Row="1"
             Canvas.ZIndex="0"
@@ -140,298 +140,302 @@
             PaneOpened="NavigationView_PaneOpened"
             SelectedItem="{x:Bind ViewModel.Selected, Mode=OneWay}"
             SelectionChanged="NavigationView_SelectionChanged">
-            <NavigationView.Resources>
-                <SolidColorBrush x:Key="NavigationViewContentBackground" Color="Transparent" />
-                <SolidColorBrush x:Key="NavigationViewContentGridBorderBrush" Color="Transparent" />
-            </NavigationView.Resources>
-            <NavigationView.MenuItems>
-                <NavigationViewItem
+      <NavigationView.Resources>
+        <SolidColorBrush x:Key="NavigationViewContentBackground" Color="Transparent" />
+        <SolidColorBrush x:Key="NavigationViewContentGridBorderBrush" Color="Transparent" />
+      </NavigationView.Resources>
+      <NavigationView.MenuItems>
+        <NavigationViewItem
                     x:Name="DashboardNavigationItem"
                     x:Uid="Shell_Dashboard"
                     helpers:NavHelper.NavigateTo="views:DashboardPage"
                     AutomationProperties.AutomationId="DashboardNavItem"
                     Icon="{ui:FontIcon Glyph=&#xE80F;}" />
 
-                <NavigationViewItem
+        <NavigationViewItem
                     x:Name="GeneralNavigationItem"
                     x:Uid="Shell_General"
                     helpers:NavHelper.NavigateTo="views:GeneralPage"
                     AutomationProperties.AutomationId="GeneralNavItem">
-                    <NavigationViewItem.Icon>
-                        <AnimatedIcon>
-                            <AnimatedIcon.Source>
-                                <animatedVisuals:AnimatedSettingsVisualSource />
-                            </AnimatedIcon.Source>
-                            <AnimatedIcon.FallbackIconSource>
-                                <SymbolIconSource Symbol="Setting" />
-                            </AnimatedIcon.FallbackIconSource>
-                        </AnimatedIcon>
-                    </NavigationViewItem.Icon>
-                </NavigationViewItem>
-                <NavigationViewItemSeparator />
+          <NavigationViewItem.Icon>
+            <AnimatedIcon>
+              <AnimatedIcon.Source>
+                <animatedVisuals:AnimatedSettingsVisualSource />
+              </AnimatedIcon.Source>
+              <AnimatedIcon.FallbackIconSource>
+                <SymbolIconSource Symbol="Setting" />
+              </AnimatedIcon.FallbackIconSource>
+            </AnimatedIcon>
+          </NavigationViewItem.Icon>
+        </NavigationViewItem>
+        <NavigationViewItemSeparator />
 
-                <!--  System Tools  -->
-                <NavigationViewItem
+        <!--  System Tools  -->
+        <NavigationViewItem
                     x:Name="SystemToolsNavigationItem"
                     x:Uid="Shell_TopLevelSystemTools"
                     AutomationProperties.AutomationId="SystemToolsNavItem"
                     Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/SystemTools.png}"
                     SelectsOnInvoked="False">
-                    <NavigationViewItem.MenuItems>
-                        <NavigationViewItem
+          <NavigationViewItem.MenuItems>
+            <NavigationViewItem
                             x:Name="AdvancedPasteNavigationItem"
                             x:Uid="Shell_AdvancedPaste"
                             helpers:NavHelper.NavigateTo="views:AdvancedPastePage"
                             AutomationProperties.AutomationId="AdvancedPasteNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/AdvancedPaste.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="AwakeNavigationItem"
                             x:Uid="Shell_Awake"
                             helpers:NavHelper.NavigateTo="views:AwakePage"
                             AutomationProperties.AutomationId="AwakeNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/Awake.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="CmdPalNavigationItem"
                             x:Uid="Shell_CmdPal"
                             helpers:NavHelper.NavigateTo="views:CmdPalPage"
                             AutomationProperties.AutomationId="CmdPalNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/CmdPal.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="ColorPickerNavigationItem"
                             x:Uid="Shell_ColorPicker"
                             helpers:NavHelper.NavigateTo="views:ColorPickerPage"
                             AutomationProperties.AutomationId="ColorPickerNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/ColorPicker.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="PowerLauncherNavigationItem"
                             x:Uid="Shell_PowerLauncher"
                             helpers:NavHelper.NavigateTo="views:PowerLauncherPage"
                             AutomationProperties.AutomationId="PowerLauncherNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/PowerToysRun.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
+                    x:Uid="Shell_LightSwitch"
+                    helpers:NavHelper.NavigateTo="views:LightSwitchPage"
+                    Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/LightSwitch.png}" />
+            <NavigationViewItem
                             x:Name="MeasureToolNavigationItem"
                             x:Uid="Shell_MeasureTool"
                             helpers:NavHelper.NavigateTo="views:MeasureToolPage"
                             AutomationProperties.AutomationId="MeasureToolNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/ScreenRuler.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="ShortcutGuideNavigationItem"
                             x:Uid="Shell_ShortcutGuide"
                             helpers:NavHelper.NavigateTo="views:ShortcutGuidePage"
                             AutomationProperties.AutomationId="ShortcutGuideNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/ShortcutGuide.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="TextExtractorNavigationItem"
                             x:Uid="Shell_TextExtractor"
                             helpers:NavHelper.NavigateTo="views:PowerOcrPage"
                             AutomationProperties.AutomationId="TextExtractorNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/TextExtractor.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="ZoomItNavigationItem"
                             x:Uid="Shell_ZoomIt"
                             helpers:NavHelper.NavigateTo="views:ZoomItPage"
                             AutomationProperties.AutomationId="ZoomItNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/ZoomIt.png}" />
-                    </NavigationViewItem.MenuItems>
-                </NavigationViewItem>
+          </NavigationViewItem.MenuItems>
+        </NavigationViewItem>
 
-                <!--  Windowing & Layouts  -->
-                <NavigationViewItem
+        <!--  Windowing & Layouts  -->
+        <NavigationViewItem
                     x:Name="WindowingAndLayoutsNavigationItem"
                     x:Uid="Shell_TopLevelWindowsAndLayouts "
                     AutomationProperties.AutomationId="WindowingAndLayoutsNavItem"
                     Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/WindowingAndLayouts.png}"
                     SelectsOnInvoked="False">
-                    <NavigationViewItem.MenuItems>
-                        <NavigationViewItem
+          <NavigationViewItem.MenuItems>
+            <NavigationViewItem
                             x:Name="AlwaysOnTopNavigationItem"
                             x:Uid="Shell_AlwaysOnTop"
                             helpers:NavHelper.NavigateTo="views:AlwaysOnTopPage"
                             AutomationProperties.AutomationId="AlwaysOnTopNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/AlwaysOnTop.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="CropAndLockNavigationItem"
                             x:Uid="Shell_CropAndLock"
                             helpers:NavHelper.NavigateTo="views:CropAndLockPage"
                             AutomationProperties.AutomationId="CropAndLockNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/CropAndLock.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="FancyZonesNavigationItem"
                             x:Uid="Shell_FancyZones"
                             helpers:NavHelper.NavigateTo="views:FancyZonesPage"
                             AutomationProperties.AutomationId="FancyZonesNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/FancyZones.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="WorkspacesNavigationItem"
                             x:Uid="Shell_Workspaces"
                             helpers:NavHelper.NavigateTo="views:WorkspacesPage"
                             AutomationProperties.AutomationId="WorkspacesNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/Workspaces.png}" />
-                    </NavigationViewItem.MenuItems>
-                </NavigationViewItem>
+          </NavigationViewItem.MenuItems>
+        </NavigationViewItem>
 
-                <!--  Input / Output  -->
-                <NavigationViewItem
+        <!--  Input / Output  -->
+        <NavigationViewItem
                     x:Name="InputOutputNavigationItem"
                     x:Uid="Shell_TopLevelInputOutput"
                     AutomationProperties.AutomationId="InputOutputNavItem"
                     Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/InputOutput.png}"
                     SelectsOnInvoked="False">
-                    <NavigationViewItem.MenuItems>
-                        <NavigationViewItem
+          <NavigationViewItem.MenuItems>
+            <NavigationViewItem
                             x:Name="KeyboardManagerNavigationItem"
                             x:Uid="Shell_KeyboardManager"
                             helpers:NavHelper.NavigateTo="views:KeyboardManagerPage"
                             AutomationProperties.AutomationId="KeyboardManagerNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/KeyboardManager.png}" />
-                        <!--  Find my mouse  -->
-                        <!--  Mouse Highlighter  -->
-                        <NavigationViewItem
+            <!--  Find my mouse  -->
+            <!--  Mouse Highlighter  -->
+            <NavigationViewItem
                             x:Name="MouseUtilitiesNavigationItem"
                             x:Uid="Shell_MouseUtilities"
                             helpers:NavHelper.NavigateTo="views:MouseUtilsPage"
                             AutomationProperties.AutomationId="MouseUtilitiesNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/MouseUtils.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="MouseWithoutBordersNavigationItem"
                             x:Uid="Shell_MouseWithoutBorders"
                             helpers:NavHelper.NavigateTo="views:MouseWithoutBordersPage"
                             AutomationProperties.AutomationId="MouseWithoutBordersNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/MouseWithoutBorders.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="QuickAccentNavigationItem"
                             x:Uid="Shell_QuickAccent"
                             helpers:NavHelper.NavigateTo="views:PowerAccentPage"
                             AutomationProperties.AutomationId="QuickAccentNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/QuickAccent.png}" />
-                    </NavigationViewItem.MenuItems>
-                </NavigationViewItem>
+          </NavigationViewItem.MenuItems>
+        </NavigationViewItem>
 
-                <!--  File Management  -->
-                <NavigationViewItem
+        <!--  File Management  -->
+        <NavigationViewItem
                     x:Name="FileManagementNavigationItem"
                     x:Uid="Shell_TopLevelFileManagement"
                     AutomationProperties.AutomationId="FileManagementNavItem"
                     Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/FileManagement.png}"
                     SelectsOnInvoked="False">
-                    <NavigationViewItem.MenuItems>
-                        <NavigationViewItem
+          <NavigationViewItem.MenuItems>
+            <NavigationViewItem
                             x:Name="PowerPreviewNavigationItem"
                             x:Uid="Shell_PowerPreview"
                             helpers:NavHelper.NavigateTo="views:PowerPreviewPage"
                             AutomationProperties.AutomationId="PowerPreviewNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/FileExplorerPreview.png}" />
-                        <!--  File Explorer Thumbnails  -->
-                        <NavigationViewItem
+            <!--  File Explorer Thumbnails  -->
+            <NavigationViewItem
                             x:Name="FileLocksmithNavigationItem"
                             x:Uid="Shell_FileLocksmith"
                             helpers:NavHelper.NavigateTo="views:FileLocksmithPage"
                             AutomationProperties.AutomationId="FileLocksmithNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/FileLocksmith.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="ImageResizerNavigationItem"
                             x:Uid="Shell_ImageResizer"
                             helpers:NavHelper.NavigateTo="views:ImageResizerPage"
                             AutomationProperties.AutomationId="ImageResizerNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/ImageResizer.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="NewPlusNavigationItem"
                             x:Uid="NewPlus_Product_Name"
                             helpers:NavHelper.NavigateTo="views:NewPlusPage"
                             AutomationProperties.AutomationId="NewPlusNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/NewPlus.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="PeekNavigationItem"
                             x:Uid="Shell_Peek"
                             helpers:NavHelper.NavigateTo="views:PeekPage"
                             AutomationProperties.AutomationId="PeekNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/Peek.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="PowerRenameNavigationItem"
                             x:Uid="Shell_PowerRename"
                             helpers:NavHelper.NavigateTo="views:PowerRenamePage"
                             AutomationProperties.AutomationId="PowerRenameNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/PowerRename.png}" />
-                    </NavigationViewItem.MenuItems>
-                </NavigationViewItem>
+          </NavigationViewItem.MenuItems>
+        </NavigationViewItem>
 
-                <!--  Advanced  -->
-                <NavigationViewItem
+        <!--  Advanced  -->
+        <NavigationViewItem
                     x:Name="AdvancedNavigationItem"
                     x:Uid="Shell_TopLevelAdvanced"
                     AutomationProperties.AutomationId="AdvancedNavItem"
                     Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/Advanced.png}"
                     SelectsOnInvoked="False">
-                    <NavigationViewItem.MenuItems>
-                        <NavigationViewItem
+          <NavigationViewItem.MenuItems>
+            <NavigationViewItem
                             x:Name="CmdNotFoundNavigationItem"
                             x:Uid="Shell_CmdNotFound"
                             helpers:NavHelper.NavigateTo="views:CmdNotFoundPage"
                             AutomationProperties.AutomationId="CmdNotFoundNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/CommandNotFound.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="EnvironmentVariablesNavigationItem"
                             x:Uid="Shell_EnvironmentVariables"
                             helpers:NavHelper.NavigateTo="views:EnvironmentVariablesPage"
                             AutomationProperties.AutomationId="EnvironmentVariablesNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/EnvironmentVariables.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="HostsNavigationItem"
                             x:Uid="Shell_Hosts"
                             helpers:NavHelper.NavigateTo="views:HostsPage"
                             AutomationProperties.AutomationId="HostsNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/Hosts.png}" />
-                        <NavigationViewItem
+            <NavigationViewItem
                             x:Name="RegistryPreviewNavigationItem"
                             x:Uid="Shell_RegistryPreview"
                             helpers:NavHelper.NavigateTo="views:RegistryPreviewPage"
                             AutomationProperties.AutomationId="RegistryPreviewNavItem"
                             Icon="{ui:BitmapIcon Source=/Assets/Settings/Icons/RegistryPreview.png}" />
-                    </NavigationViewItem.MenuItems>
-                </NavigationViewItem>
-            </NavigationView.MenuItems>
-            <NavigationView.PaneFooter>
-                <StackPanel Orientation="Vertical">
-                    <NavigationViewItem
+          </NavigationViewItem.MenuItems>
+        </NavigationViewItem>
+      </NavigationView.MenuItems>
+      <NavigationView.PaneFooter>
+        <StackPanel Orientation="Vertical">
+          <NavigationViewItem
                         x:Name="OOBENavigationItem"
                         x:Uid="OOBE_NavViewItem"
                         AutomationProperties.AutomationId="OOBENavItem"
                         Icon="{ui:FontIcon Glyph=&#xF133;}"
                         Tapped="OOBEItem_Tapped" />
-                    <NavigationViewItem
+          <NavigationViewItem
                         x:Name="WhatIsNewNavigationItem"
                         x:Uid="WhatIsNew_NavViewItem"
                         AutomationProperties.AutomationId="WhatIsNewNavItem"
                         Icon="{ui:FontIcon Glyph=&#xE789;}"
                         Tapped="WhatIsNewItem_Tapped" />
-                    <NavigationViewItem
+          <NavigationViewItem
                         x:Name="FeedbackNavigationItem"
                         x:Uid="Feedback_NavViewItem"
                         AutomationProperties.AutomationId="FeedbackNavItem"
                         Icon="{ui:FontIcon Glyph=&#xED15;}"
                         Tapped="FeedbackItem_Tapped" />
-                    <NavigationViewItem
+          <NavigationViewItem
                         x:Name="CloseNavigationItem"
                         x:Uid="Close_NavViewItem"
                         AutomationProperties.AutomationId="CloseNavItem"
                         Icon="{ui:FontIcon Glyph=&#xE7E8;}"
                         Tapped="Close_Tapped"
                         Visibility="{x:Bind ViewModel.ShowCloseMenu, Mode=OneWay}" />
-                </StackPanel>
-            </NavigationView.PaneFooter>
-            <i:Interaction.Behaviors>
-                <ic:EventTriggerBehavior EventName="ItemInvoked">
-                    <ic:InvokeCommandAction Command="{x:Bind ViewModel.ItemInvokedCommand}" />
-                </ic:EventTriggerBehavior>
-            </i:Interaction.Behaviors>
-            <Frame x:Name="shellFrame" />
-        </NavigationView>
-        <ContentDialog
+        </StackPanel>
+      </NavigationView.PaneFooter>
+      <i:Interaction.Behaviors>
+        <ic:EventTriggerBehavior EventName="ItemInvoked">
+          <ic:InvokeCommandAction Command="{x:Bind ViewModel.ItemInvokedCommand}" />
+        </ic:EventTriggerBehavior>
+      </i:Interaction.Behaviors>
+      <Frame x:Name="shellFrame" />
+    </NavigationView>
+    <ContentDialog
             x:Name="CloseDialog"
             x:Uid="CloseDialog"
             IsPrimaryButtonEnabled="True"
             IsSecondaryButtonEnabled="True"
             PrimaryButtonClick="CloseDialog_Click"
             PrimaryButtonStyle="{StaticResource AccentButtonStyle}" />
-    </Grid>
+  </Grid>
 </UserControl>

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -3239,6 +3239,15 @@ Activate by holding the key for the character you want to add an accent to, then
   <data name="AlwaysOnTop_ShortDescription" xml:space="preserve">
     <value>Pin a window</value>
   </data>
+  <data name="LightSwitch_ThemeToggle_Shortcut.Header" xml:space="preserve">
+    <value>Toggle theme shortcut</value>
+  </data>
+	<data name="LightSwitch_ThemeToggle_Shortcut.Description" xml:space="preserve">
+    <value>Toggle between light and dark mode</value>
+  </data>
+  <data name="LightSwitch_ForceDarkMode" xml:space="preserve">
+    <value>Toggle theme</value>
+  </data>
   <data name="ColorPicker_ShortDescription" xml:space="preserve">
     <value>Pick a color</value>
   </data>
@@ -5219,6 +5228,24 @@ To record a specific window, enter the hotkey with the Alt key in the opposite m
   <data name="CloseDialog.SecondaryButtonText" xml:space="preserve">
     <value>No</value>
   </data>
+  <data name="Shell_LightSwitch.Content" xml:space="preserve">
+    <value>LightSwitch</value>
+  </data>
+  <data name="LightSwitch_EnableToggleControl_HeaderText.Header" xml:space="preserve">
+    <value>Enable Light Switch</value>
+  </data>
+  <data name="LightSwitch.ModuleDescription" xml:space="preserve">
+    <value>This is a module that allows you to control light/dark theming via set times, sun rise, or directly invoking the change.</value>
+  </data>
+  <data name="LightSwitch.ModuleTitle" xml:space="preserve">
+    <value>Light Switch</value>
+  </data>
+  <data name="LearnMore_LightSwitch.Text" xml:space="preserve">
+    <value>Learn more about Light Switch</value>
+  </data>
+  <data name="LightSwitch_BehaviorSettingsGroup.Header" xml:space="preserve">
+    <value>Behavior</value>
+  </data>
   <data name="KeyBack" xml:space="preserve">
     <value>Back key</value>
   </data>

src/settings-ui/Settings.UI/ViewModels/DashboardViewModel.cs

@@ -22,6 +22,7 @@ using Microsoft.PowerToys.Settings.UI.Services;
 using Microsoft.PowerToys.Settings.UI.Views;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Settings.UI.Library;
 
 namespace Microsoft.PowerToys.Settings.UI.ViewModels
 {
@@ -208,6 +209,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
                 ModuleType.CmdPal => GetModuleItemsCmdPal(),
                 ModuleType.ColorPicker => GetModuleItemsColorPicker(),
                 ModuleType.CropAndLock => GetModuleItemsCropAndLock(),
+                ModuleType.LightSwitch => GetModuleItemsLightSwitch(),
                 ModuleType.EnvironmentVariables => GetModuleItemsEnvironmentVariables(),
                 ModuleType.FancyZones => GetModuleItemsFancyZones(),
                 ModuleType.FindMyMouse => GetModuleItemsFindMyMouse(),
@@ -260,6 +262,17 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             return new ObservableCollection<DashboardModuleItem>(list);
         }
 
+        private ObservableCollection<DashboardModuleItem> GetModuleItemsLightSwitch()
+        {
+            ISettingsRepository<LightSwitchSettings> moduleSettingsRepository = SettingsRepository<LightSwitchSettings>.GetInstance(new SettingsUtils());
+            var settings = moduleSettingsRepository.SettingsConfig;
+            var list = new List<DashboardModuleItem>
+            {
+                new DashboardModuleShortcutItem() { Label = resourceLoader.GetString("LightSwitch_ForceDarkMode"), Shortcut = settings.Properties.ToggleThemeHotkey.Value.GetKeysList() },
+            };
+            return new ObservableCollection<DashboardModuleItem>(list);
+        }
+
         private ObservableCollection<DashboardModuleItem> GetModuleItemsCropAndLock()
         {
             ISettingsRepository<CropAndLockSettings> moduleSettingsRepository = SettingsRepository<CropAndLockSettings>.GetInstance(new SettingsUtils());

src/settings-ui/Settings.UI/ViewModels/LightSwitchViewModel.cs

@@ -0,0 +1,391 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.ObjectModel;
+using System.Globalization;
+using System.Runtime.CompilerServices;
+using System.Text.Json;
+using System.Windows.Input;
+using ManagedCommon;
+using Microsoft.PowerToys.Settings.UI.Helpers;
+using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.Library.Helpers;
+using Microsoft.PowerToys.Settings.UI.SerializationContext;
+using Settings.UI.Library;
+using Settings.UI.Library.Helpers;
+
+namespace Microsoft.PowerToys.Settings.UI.ViewModels
+{
+    public partial class LightSwitchViewModel : Observable
+    {
+        private Func<string, int> SendConfigMSG { get; }
+
+        public ObservableCollection<City> Cities { get; } = new();
+
+        public LightSwitchViewModel(LightSwitchSettings initialSettings = null, Func<string, int> ipcMSGCallBackFunc = null)
+        {
+            _moduleSettings = initialSettings ?? new LightSwitchSettings();
+            SendConfigMSG = ipcMSGCallBackFunc;
+
+            ForceLightCommand = new RelayCommand(ForceLightNow);
+            ForceDarkCommand = new RelayCommand(ForceDarkNow);
+
+            AvailableScheduleModes = new ObservableCollection<string>
+        {
+            "FixedHours",
+            "SunsetToSunriseGeo",
+            "SunsetToSunriseUser",
+        };
+
+            _toggleThemeHotkey = _moduleSettings.Properties.ToggleThemeHotkey.Value;
+        }
+
+        private void ForceLightNow()
+        {
+            Logger.LogInfo("Sending custom action: forceLight");
+            SendCustomAction("forceLight");
+        }
+
+        private void ForceDarkNow()
+        {
+            Logger.LogInfo("Sending custom action: forceDark");
+            SendCustomAction("forceDark");
+        }
+
+        private void SendCustomAction(string actionName)
+        {
+            SendConfigMSG("{\"action\":{\"LightSwitch\":{\"action_name\":\"" + actionName + "\", \"value\":\"\"}}}");
+        }
+
+        public LightSwitchSettings ModuleSettings
+        {
+            get => _moduleSettings;
+            set
+            {
+                if (_moduleSettings != value)
+                {
+                    _moduleSettings = value;
+
+                    OnPropertyChanged(nameof(ModuleSettings));
+                    RefreshModuleSettings();
+                    RefreshEnabledState();
+                }
+            }
+        }
+
+        public bool IsEnabled
+        {
+            get
+            {
+                if (_enabledStateIsGPOConfigured)
+                {
+                    return _enabledGPOConfiguration;
+                }
+                else
+                {
+                    return _isEnabled;
+                }
+            }
+
+            set
+            {
+                if (_isEnabled != value)
+                {
+                    if (_enabledStateIsGPOConfigured)
+                    {
+                        // If it's GPO configured, shouldn't be able to change this state.
+                        return;
+                    }
+
+                    _isEnabled = value;
+
+                    RefreshEnabledState();
+
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public bool IsEnabledGpoConfigured
+        {
+            get => _enabledStateIsGPOConfigured;
+            set
+            {
+                if (_enabledStateIsGPOConfigured != value)
+                {
+                    _enabledStateIsGPOConfigured = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public bool EnabledGPOConfiguration
+        {
+            get => _enabledGPOConfiguration;
+            set
+            {
+                if (_enabledGPOConfiguration != value)
+                {
+                    _enabledGPOConfiguration = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public string ScheduleMode
+        {
+            get => ModuleSettings.Properties.ScheduleMode.Value;
+            set
+            {
+                if (ModuleSettings.Properties.ScheduleMode.Value != value)
+                {
+                    ModuleSettings.Properties.ScheduleMode.Value = value;
+                    OnPropertyChanged(nameof(ScheduleMode));
+                }
+            }
+        }
+
+        public ObservableCollection<string> AvailableScheduleModes { get; }
+
+        public bool ChangeSystem
+        {
+            get => ModuleSettings.Properties.ChangeSystem.Value;
+            set
+            {
+                if (ModuleSettings.Properties.ChangeSystem.Value != value)
+                {
+                    ModuleSettings.Properties.ChangeSystem.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public bool ChangeApps
+        {
+            get => ModuleSettings.Properties.ChangeApps.Value;
+            set
+            {
+                if (ModuleSettings.Properties.ChangeApps.Value != value)
+                {
+                    ModuleSettings.Properties.ChangeApps.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public int LightTime
+        {
+            get => ModuleSettings.Properties.LightTime.Value;
+            set
+            {
+                if (ModuleSettings.Properties.LightTime.Value != value)
+                {
+                    ModuleSettings.Properties.LightTime.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public int DarkTime
+        {
+            get => ModuleSettings.Properties.DarkTime.Value;
+            set
+            {
+                if (ModuleSettings.Properties.DarkTime.Value != value)
+                {
+                    ModuleSettings.Properties.DarkTime.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public int Offset
+        {
+            get => ModuleSettings.Properties.Offset.Value;
+            set
+            {
+                if (ModuleSettings.Properties.Offset.Value != value)
+                {
+                    ModuleSettings.Properties.Offset.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public TimeSpan LightTimeTimeSpan
+        {
+            get => TimeSpan.FromMinutes(LightTime);
+            set
+            {
+                int minutes = (int)value.TotalMinutes;
+                if (LightTime != minutes)
+                {
+                    LightTime = minutes;
+                    NotifyPropertyChanged();
+                    OnPropertyChanged(nameof(LightTimeTimeSpan));
+                }
+            }
+        }
+
+        public TimeSpan DarkTimeTimeSpan
+        {
+            get => TimeSpan.FromMinutes(DarkTime);
+            set
+            {
+                int minutes = (int)value.TotalMinutes;
+                if (DarkTime != minutes)
+                {
+                    DarkTime = minutes;
+                    NotifyPropertyChanged();
+                    OnPropertyChanged(nameof(DarkTimeTimeSpan));
+                }
+            }
+        }
+
+        public string Latitude
+        {
+            get => ModuleSettings.Properties.Latitude.Value;
+            set
+            {
+                if (ModuleSettings.Properties.Latitude.Value != value)
+                {
+                    ModuleSettings.Properties.Latitude.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public string Longitude
+        {
+            get => ModuleSettings.Properties.Longitude.Value;
+            set
+            {
+                if (ModuleSettings.Properties.Longitude.Value != value)
+                {
+                    ModuleSettings.Properties.Longitude.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        private City _selectedCity;
+
+        public City SelectedCity
+        {
+            get => _selectedCity;
+            set
+            {
+                if (_selectedCity != value)
+                {
+                    _selectedCity = value;
+                    NotifyPropertyChanged();
+
+                    UpdateSunTimesForSelectedCity();
+                }
+            }
+        }
+
+        private string _cityTimesText = "Please sync your location";
+
+        public string CityTimesText
+        {
+            get => _cityTimesText;
+            set
+            {
+                if (_cityTimesText != value)
+                {
+                    _cityTimesText = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
+        public HotkeySettings ToggleThemeActivationShortcut
+        {
+            get => _toggleThemeHotkey;
+
+            set
+            {
+                if (value != _toggleThemeHotkey)
+                {
+                    if (value == null)
+                    {
+                        _toggleThemeHotkey = LightSwitchProperties.DefaultToggleThemeHotkey;
+                    }
+                    else
+                    {
+                        _toggleThemeHotkey = value;
+                    }
+
+                    _moduleSettings.Properties.ToggleThemeHotkey.Value = _toggleThemeHotkey;
+                    NotifyPropertyChanged();
+
+                    SendConfigMSG(
+                        string.Format(
+                            CultureInfo.InvariantCulture,
+                            "{{ \"powertoys\": {{ \"{0}\": {1} }} }}",
+                            LightSwitchSettings.ModuleName,
+                            JsonSerializer.Serialize(_moduleSettings, (System.Text.Json.Serialization.Metadata.JsonTypeInfo<LightSwitchSettings>)SourceGenerationContextContext.Default.LightSwitchSettings)));
+                }
+            }
+        }
+
+        public void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            Logger.LogInfo($"Changed the property {propertyName}");
+            OnPropertyChanged(propertyName);
+        }
+
+        public void RefreshEnabledState()
+        {
+            OnPropertyChanged(nameof(IsEnabled));
+        }
+
+        public void RefreshModuleSettings()
+        {
+            OnPropertyChanged(nameof(ChangeSystem));
+            OnPropertyChanged(nameof(ChangeApps));
+            OnPropertyChanged(nameof(LightTime));
+            OnPropertyChanged(nameof(DarkTime));
+            OnPropertyChanged(nameof(Offset));
+            OnPropertyChanged(nameof(Latitude));
+            OnPropertyChanged(nameof(Longitude));
+            OnPropertyChanged(nameof(ScheduleMode));
+        }
+
+        public void UpdateSunTimesForSelectedCity()
+        {
+            if (SelectedCity == null)
+            {
+                return;
+            }
+
+            SunTimes result = SunCalc.CalculateSunriseSunset(
+                SelectedCity.Latitude,
+                SelectedCity.Longitude,
+                DateTime.Now.Year,
+                DateTime.Now.Month,
+                DateTime.Now.Day);
+
+            LightTime = (result.SunriseHour * 60) + result.SunriseMinute;
+            DarkTime = (result.SunsetHour * 60) + result.SunsetMinute;
+            Latitude = SelectedCity.Latitude.ToString(CultureInfo.InvariantCulture);
+            Longitude = SelectedCity.Longitude.ToString(CultureInfo.InvariantCulture);
+
+            CityTimesText = $"Sunrise: {result.SunriseHour}:{result.SunriseMinute:D2}\n" +
+                            $"Sunset: {result.SunsetHour}:{result.SunsetMinute:D2}";
+        }
+
+        private bool _enabledStateIsGPOConfigured;
+        private bool _enabledGPOConfiguration;
+        private LightSwitchSettings _moduleSettings;
+        private bool _isEnabled;
+        private HotkeySettings _toggleThemeHotkey;
+
+        public ICommand ForceLightCommand { get; }
+
+        public ICommand ForceDarkCommand { get; }
+    }
+}