using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Forms;
using Flowframes.Forms.Main;
using Flowframes.IO;
using Flowframes.Ui;

namespace Flowframes.Os
{
    class StartupChecks
    {
        static bool IsWin10Or11()
        {
            string winVer = OsUtils.GetWindowsVer();

            if (winVer.IsEmpty())
                return true;    // If it fails, return true for future-proofing

            return winVer.Lower().Contains("windows 10") || winVer.Lower().Contains("windows 11");
        }

        public static void CheckOs()
        {
            if (!File.Exists(Paths.GetVerPath()) && Paths.GetExeDir().Lower().Contains("\\temp"))
            {
                UiUtils.ShowMessageBox("You seem to be running Flowframes out of a compressed archive.\nPlease extract the whole archive first!", UiUtils.MessageType.Error);
                IoUtils.TryDeleteIfExists(Paths.GetDataPath());
                Application.Exit();
            }

            // Attempt to create an empty new folder in exe dir to check if we have permissions
            try
            {
                string testDir = Path.Combine(Paths.GetExeDir(), "test.tmp");
                Directory.CreateDirectory(Path.Combine(Paths.GetExeDir(), testDir));
                Directory.Delete(Path.Combine(Paths.GetExeDir(), testDir));
            }
            catch (Exception e)
            {
                UiUtils.ShowMessageBox($"Flowframes does not have permission to write to its own directory!\nPlease move it to a different folder.\n\nCurrent install directory: {Paths.GetExeDir()}", UiUtils.MessageType.Error);
                Application.Exit();
            }

            string winVer = OsUtils.GetWindowsVer();
            Logger.Log($"Running {winVer}", true);

            if (!Environment.Is64BitOperatingSystem && !Config.GetBool("allow32Bit", false))
            {
                UiUtils.ShowMessageBox("This application is not compatible with 32-bit operating systems!", UiUtils.MessageType.Error);
                Application.Exit();
            }

            if (winVer.IsEmpty())
                return;

            if (!winVer.Lower().Contains("windows 10") && !winVer.Lower().Contains("windows 11") && !Config.GetBool("ignoreIncompatibleOs", false))
            {
                UiUtils.ShowMessageBox($"This application was made for Windows 10/11 and is not officially compatible with {winVer}.\n\n" +
                                $"Use it at your own risk and do NOT ask for support as long as your are on {winVer}.", UiUtils.MessageType.Warning);
            }
        }

        public static async Task SymlinksCheck()
        {
            if (!IsWin10Or11())
                return;

            bool silent = Config.GetBool("silentDevmodeCheck", true);
            string ver = Updater.GetInstalledVer().ToString();
            bool symlinksAllowed = Symlinks.SymlinksAllowed();
            Logger.Log($"Symlinks allowed: {symlinksAllowed}", true);

            if (!symlinksAllowed && Config.Get(Config.Key.askedForDevModeVersion) != ver)
            {
                if (!silent)
                {
                    UiUtils.ShowMessageBox("Flowframes will now enable Windows' Developer Mode which is required for video encoding improvements.\n\n" +
                                    "This requires administrator privileges once.", UiUtils.MessageType.Message);
                }

                Logger.Log($"Trying to enable dev mode.", true);

                string devmodeBatchPath = Path.Combine(Paths.GetDataPath(), "devmode.bat");
                File.WriteAllText(devmodeBatchPath, Properties.Resources.devmode);

                Process devmodeProc = OsUtils.NewProcess(true);
                devmodeProc.StartInfo.Arguments = $"/C {devmodeBatchPath.Wrap()}";
                devmodeProc.Start();
                while (!devmodeProc.HasExited) await Task.Delay(100);

                bool symlinksWorksNow = false;

                for (int retries = 8; retries > 0; retries--)
                {
                    symlinksWorksNow = Symlinks.SymlinksAllowed();

                    if (symlinksWorksNow)
                        break;

                    await Task.Delay(500);
                }

                if (!symlinksWorksNow)
                {
                    if (!silent)
                    {
                        UiUtils.ShowMessageBox("Failed to enable developer mode - Perhaps you do not have sufficient privileges.\n\n" +
                                        "Without Developer Mode, video encoding will be noticably slower.\n\nYou can still try enabling " +
                                        "it manually in the Windows 10 Settings:\nSettings -> Update & security -> For developers -> Developer mode.", UiUtils.MessageType.Message);
                    }

                    Logger.Log("Failed to enable dev mode.", true);
                    Config.Set("askedForDevModeVersion", ver);
                }
                else
                {
                    Logger.Log("Enabled Windows Developer Mode.", silent);
                }

                IoUtils.TryDeleteIfExists(devmodeBatchPath);
            }
        }

        public static void GpuCheck(bool exit = true)
        {
            bool anyGpu = OsUtils.HasGpu();

            if (!anyGpu)
            {
                if (exit)
                {
                    Form1.CloseAllSplashForms();
                }

                UiUtils.ShowMessageBox("No GPU detected!\n\nFlowframes requires a GPU (graphics card or integrated) with Vulkan support to run AI interpolation models.\n\nRecommended:" +
                    "\n- Nvidia GeForce GTX 1000 series or newer\n- AMD Radeon RX 5000 series or newer", UiUtils.MessageType.Error);

                if (exit)
                {
                    Application.Exit();
                }
            }
        }
    }
}