using Avalonia;
using Avalonia.OpenGL.Egl;

using System.CommandLine;

namespace GSS2.Test;

public partial class Program
{
    private enum RenderingMode
    {
        X11,
        DRM
    }

    private static List<string>? _args = null;
    private static readonly RootCommand _rootCommand = new("Run UI application");
    private static readonly Option<bool> _fullscreen = new("--fullscreen")
    {
        Description = "Run in fullscreen mode"
    };
    private static readonly Option<RenderingMode> _renderingMode = new("--rendering-mode")
    {
        Description = "Rendering mode to use",
        DefaultValueFactory = (_) => RenderingMode.X11
    };
    private static readonly Option<bool> _hideConsole = new("--hide-console")
    {
        Description = "Suppress console output",
        DefaultValueFactory = (result) => result.GetRequiredValue(_renderingMode) == RenderingMode.DRM
    };

    private static readonly Command _cameraTuningCommand = new("camera-tuning")
    {
        Description = "Tune camera parameters"
    };
    private static readonly Option<FileInfo> _cameraTuningOutputFile = new("--output")
    {
        Description = "Output image file",
        Required = false
    };
    private static readonly Option<double> _cameraTuningGainR = new("--gain-r")
    {
        Description = "Color gain (red channel) to start from",
        DefaultValueFactory = (_) => 1
    };
    private static readonly Option<double> _cameraTuningGainG = new("--gain-g")
    {
        Description = "Color gain (green channel) to start from",
        DefaultValueFactory = (_) => 1
    };
    private static readonly Option<double> _cameraTuningGainB = new("--gain-b")
    {
        Description = "Color gain (blue channel) to start from",
        DefaultValueFactory = (_) => 1
    };
    private static readonly Option<double> _cameraTuningThreshold = new("--threshold")
    {
        Description = "Threshold to stop on",
        DefaultValueFactory = (_) => 0.1
    };
    private static readonly Option<uint> _cameraTuningSteps = new("--steps")
    {
        Description = "Maximum steps count",
        DefaultValueFactory = (_) => 10
    };

    private static readonly Command _captureCommand = new("capture")
    {
        Description = "Capture image from camera"
    };
    private static readonly Option<FileInfo> _captureOutputFile = new("--output")
    {
        Description = "Output image file",
        DefaultValueFactory = (_) => new FileInfo("image.png")
    };
    private static readonly Option<double> _captureIntensityWhite = new("--intensity-white")
    {
        Description = "Illuminator intensity for white (from 0 to 1)",
        DefaultValueFactory = (_) => 1
    };
    private static readonly Option<double> _captureIntensityUv365nm = new("--intensity-uv365nm")
    {
        Description = "Illuminator intensity for UV 365 nm (from 0 to 1)",
        DefaultValueFactory = (_) => 0
    };
    private static readonly Option<double> _captureIntensityUv254nm = new("--intensity-uv254nm")
    {
        Description = "Illuminator intensity for UV 254 nm (from 0 to 1)",
        DefaultValueFactory = (_) => 0
    };

    private static readonly Command _imageStorageClear = new("image-storage-clear")
    {
        Description = "Clear image storage from unused images"
    };


    public static event ConsoleCancelEventHandler? ShutdownRequested;

    [STAThread]
    public static int Main(string[] args)
    {
        _args = args.ToList();

#if DEBUG
        WaitDebuggerIfNeeded();
#endif

        _rootCommand.SetAction(Ui);
        _rootCommand.Add(_fullscreen);
        _rootCommand.Add(_renderingMode);
        _rootCommand.Add(_hideConsole);

        _rootCommand.Add(_cameraTuningCommand);
        _cameraTuningCommand.SetAction(CameraTuning);
        _cameraTuningCommand.Add(_cameraTuningOutputFile);
        _cameraTuningCommand.Add(_cameraTuningGainR);
        _cameraTuningCommand.Add(_cameraTuningGainG);
        _cameraTuningCommand.Add(_cameraTuningGainB);
        _cameraTuningCommand.Add(_cameraTuningThreshold);
        _cameraTuningCommand.Add(_cameraTuningSteps);

        _rootCommand.Add(_captureCommand);
        _captureCommand.SetAction(Capture);
        _captureCommand.Add(_captureOutputFile);
        _captureCommand.Add(_captureIntensityWhite);
        _captureCommand.Add(_captureIntensityUv365nm);
        _captureCommand.Add(_captureIntensityUv254nm);

        _rootCommand.Add(_imageStorageClear);
        _imageStorageClear.SetAction(ImageStorageClear);

        Console.CancelKeyPress += new ConsoleCancelEventHandler(OnProgramShutdown);
        Console.WriteLine("Press Ctrl+C to shut down.");

        var parseResult = _rootCommand.Parse(_args);
        if (parseResult.Errors.Count() != 0)
        {
            foreach (var parseError in parseResult.Errors)
                Console.Error.WriteLine(parseError.Message);
            return 1;
        }

        return parseResult.Invoke();
    }

    private static void OnProgramShutdown(object? sender, ConsoleCancelEventArgs ea)
    {
        ShutdownRequested?.Invoke(sender, ea);
        ea.Cancel = true;
    }

    private static void WaitDebuggerIfNeeded()
    {
        if (System.Diagnostics.Debugger.IsAttached)
            return;

        if (_args is null || !_args.Contains("--debug"))
            return;

        _args.Remove("--debug");

        bool keepWaiting = true;

        void CancelHandle(object? sender, ConsoleCancelEventArgs e)
        {
            e.Cancel = true;
            keepWaiting = false;
            Console.WriteLine("\nWait cancelled by user.");
            Environment.Exit(0);
        }
        Console.CancelKeyPress += CancelHandle;

        Console.WriteLine("Waiting debugger attach (Press Ctrl+C to cancel)");
        Console.WriteLine($"Process Id: {Environment.ProcessId}");
        Console.WriteLine($"Process Name: {Environment.ProcessPath}");
        Console.WriteLine($"Thread Id: {Thread.CurrentThread.ManagedThreadId}");
        Console.WriteLine($"Thread Name: {Thread.CurrentThread.Name}");

        while (!System.Diagnostics.Debugger.IsAttached && keepWaiting)
            Thread.Sleep(100);

        if (System.Diagnostics.Debugger.IsAttached)
            System.Diagnostics.Debugger.Break();

        Console.CancelKeyPress -= CancelHandle;
    }
}