using Microsoft.Extensions.Logging;

using LibCameraSharp;

using GSS2.Core.Hardware;

using CommunityToolkit.Mvvm.ComponentModel;

using Avalonia.Media;

namespace GSS2.UI.Core.ViewModels;

public partial class CameraViewModel : ViewModelBase, IDisposable
{
    private bool _disposedValue;
    private readonly CameraService _cameraService;
    private readonly ILogger<CameraViewModel> _logger;
    private readonly System.Timers.Timer _renderTimer;

    public event EventHandler? RenderReqested;

    [ObservableProperty] private Color _background = Colors.Transparent;
    [ObservableProperty] private Stretch _stretchMode = Stretch.Uniform;
    [ObservableProperty] private TileMode _tileMode = TileMode.None;

    public CameraViewModel(CameraService cameraService, ILogger<CameraViewModel> logger)
    {
        _cameraService = cameraService;
        _logger = logger;
        _renderTimer = new System.Timers.Timer(33);
        _renderTimer.Elapsed += (_, _) =>
        {
            if (!_cameraService.IsImageCapturing)
                RenderReqested?.Invoke(this, new EventArgs());
        };
        _logger.LogInformation("{} initialized", nameof(CameraViewModel));
    }

    public void StartViewFinder()
    {
        _cameraService.StartViewFinder();
        _renderTimer.Start();
    }
    public void StopViewFinder()
    {
        _renderTimer.Stop();
        _cameraService.StopViewFinder();
    }
    public bool CanGrabViewFinderFrame() => !_cameraService.IsImageCapturing;
    public (FrameBuffer, StreamConfiguration)? GrabViewFinderFrame() => _cameraService.GrabViewFinderFrame();
    public void ReturnViewFinderFrame(FrameBuffer frameBuffer) => _cameraService.ReturnViewFinderFrame(frameBuffer);

    protected virtual void Dispose(bool disposing)
    {
        if (!_disposedValue)
        {
            if (disposing)
            {
                _renderTimer.Stop();
                _renderTimer.Dispose();
            }
            _disposedValue = true;
        }
    }
    public void Dispose()
    {
        Dispose(disposing: true);
        GC.SuppressFinalize(this);
    }
}