// 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.Runtime.InteropServices;

namespace Microsoft.PowerToys.Settings.UI.Helpers;

internal static class NativeKeyboardHelper
{
    [StructLayout(LayoutKind.Sequential)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1307:Accessible fields should begin with upper-case letter", Justification = "Matching Native Structure")]
    internal struct INPUT
    {
        internal INPUTTYPE type;
        internal InputUnion data;

        internal static int Size
        {
            get { return Marshal.SizeOf<INPUT>(); }
        }
    }

    [StructLayout(LayoutKind.Explicit)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1307:Accessible fields should begin with upper-case letter", Justification = "Matching Native Structure")]
    internal struct InputUnion
    {
        [FieldOffset(0)]
        internal MOUSEINPUT mi;
        [FieldOffset(0)]
        internal KEYBDINPUT ki;
        [FieldOffset(0)]
        internal HARDWAREINPUT hi;
    }

    [StructLayout(LayoutKind.Sequential)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1307:Accessible fields should begin with upper-case letter", Justification = "Matching Native Structure")]
    internal struct MOUSEINPUT
    {
        internal int dx;
        internal int dy;
        internal int mouseData;
        internal uint dwFlags;
        internal uint time;
        internal UIntPtr dwExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1307:Accessible fields should begin with upper-case letter", Justification = "Matching Native Structure")]
    internal struct KEYBDINPUT
    {
        internal short wVk;
        internal short wScan;
        internal uint dwFlags;
        internal int time;
        internal UIntPtr dwExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1307:Accessible fields should begin with upper-case letter", Justification = "Matching Native Structure")]
    internal struct HARDWAREINPUT
    {
        internal int uMsg;
        internal short wParamL;
        internal short wParamH;
    }

    internal enum INPUTTYPE : uint
    {
        INPUT_MOUSE = 0,
        INPUT_KEYBOARD = 1,
        INPUT_HARDWARE = 2,
    }

    [Flags]
    internal enum KeyEventF
    {
        KeyDown = 0x0000,
        ExtendedKey = 0x0001,
        KeyUp = 0x0002,
        Unicode = 0x0004,
        Scancode = 0x0008,
    }
}