using System.IO;
using LibVLCSharp.Shared;

namespace DualScreenDemo.Services
{
    public static class ControlExtensions
    {
        public static Task InvokeAsync(this Control control, Func<Task> func)
        {
            var tcs = new TaskCompletionSource<object>();
            control.BeginInvoke(new Action(async () =>
            {
                try
                {
                    await func();
                    tcs.SetResult(null);
                }
                catch (Exception ex)
                {
                    tcs.SetException(ex);
                }
            }));
            return tcs.Task;
        }
    }

    public class MediaService : IDisposable
    {
        private LibVLC _libVLC;
        private MediaPlayer _mediaPlayer;
        private Media? _media;
        private bool _disposed;

        public MediaService()
        {
            Core.Initialize();
            _libVLC = new LibVLC(
                //  "--verbose=-1",
                 enableDebugLogs: true,
                "--audio-time-stretch",
                "--vout=automatic",
                "--h264-fps=30",
                "--aout=directsound",
                //  "--network-caching=300",
                //  "--file-caching=300",
                "--audio-time-stretch"
            );

            _libVLC.Log += (sender, args) =>
            {
                Console.WriteLine($"[{args.Level}] {args.Message}");
            };

            _mediaPlayer = new MediaPlayer(_libVLC);
            _mediaPlayer.AspectRatio = "16:9";
            _mediaPlayer.EnableHardwareDecoding = true;
        }

        #region Player Setup
        public void SetVideoOutput(nint handle, int width, int height)
        {
            try
            {
                _mediaPlayer.Hwnd = handle;
                _mediaPlayer.AspectRatio = $"{width}:{height}";
                _mediaPlayer.Scale = 0;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Program.WriteLog(ex.ToString());
            }
        }
        #endregion

        #region Playback
        public MediaPlayer Player => _mediaPlayer;
        public bool IsPlaying => _mediaPlayer.IsPlaying;


        public bool IsAtEnd()
        {
            if (_mediaPlayer.State == VLCState.Ended)
            {
                return true;
            }
            return false;
        }
        
        public bool IsAtEndTime()
        {
            var duration = _mediaPlayer.Media?.Duration ?? 0;
            var time = _mediaPlayer.Time;
            return duration > 0 && Math.Abs(duration - time) < 1000;
        }

        private bool _isTransitioning = false;




        public void LoadMedia(string filePath, int audioTrackIndex = 0)
        {
            try
            {
                // _mediaPlayer.Stop();
                _media?.Dispose();
                _media = new Media(_libVLC, filePath, FromType.FromPath);
                _mediaPlayer.Play(addMediaOption(_media, audioTrackIndex));
                _mediaPlayer.Stopped += (s, e) => Console.WriteLine("Player Stopped");

                // _mediaPlayer.EndReached += async(s, e) =>
                // {
                //     if (_isTransitioning) return;
                //     _isTransitioning = true;

                //     try
                //     {
                //         await VideoPlayerForm.Instance.InvokeAsync(async () =>
                //         {
                //             await VideoPlayerForm.Instance.PlayNextSong();
                //             await Task.Delay(2000); // Optional delay
                //         });
                //     }
                //     catch (Exception ex)
                //     {
                //         Console.WriteLine($"Error during transition: {ex.Message}");
                //     }
                //     finally
                //     {
                //         _isTransitioning = false;
                //     }
                // };
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Program.WriteLog(ex.ToString());
            }
        }

        private Media addMediaOption(Media media, int audioTrackIndex)
        {
            media.AddOption(":avcodec-hw=dxva2");
            media.AddOption($":drop-late-frames");
            media.AddOption(":audio-output=directsound");
            media.AddOption(":network-caching=300");
            media.AddOption(":live-caching=300");
            media.AddOption(":file-caching=300");
            media.AddOption($":audio-track={audioTrackIndex}");
            return media;
        }

        public void Play() => _mediaPlayer.Play();
        public void Pause() => _mediaPlayer.Pause();
        public void Stop() => _mediaPlayer.Stop();
        #endregion

        #region Audio
        public List<TrackDescription> GetAudioTracks()
        {
            var result = new List<TrackDescription>();
            var media = _mediaPlayer.Media;

            if (media == null) return result;

            if (!media.IsParsed)
                media.Parse(MediaParseOptions.ParseLocal);

            var tracks = media.Tracks;
            if (tracks == null) return result;

            foreach (var track in tracks.Where(t => t.TrackType == TrackType.Audio))
            {
                result.Add(new TrackDescription
                {
                    Id = track.Id,
                    Name = !string.IsNullOrEmpty(track.Language) ? track.Language : $"Audio Track {track.Id}"
                });
            }
            return result;
        }

        public void SetAudioTrack(int trackIndex)
        {
            var audioTracks = GetAudioTracks();
            if (trackIndex < 0 || trackIndex >= audioTracks.Count) return;
            _mediaPlayer.SetAudioTrack(audioTracks[trackIndex].Id);
        }
        #endregion

        #region Volume
        public void SetVolume(int volume) => _mediaPlayer.Volume = volume;
        public int GetVolume() => _mediaPlayer.Volume;
        public bool Mute(bool isMuted)
        {
            _mediaPlayer.Mute = isMuted;
            return _mediaPlayer.Mute;
        }
            
        #endregion

        #region Dispose
        public void Dispose()
        {
            if (_disposed) return;

            _mediaPlayer.Dispose();
            _media?.Dispose();
            _libVLC.Dispose();

            _media = null;
            _disposed = true;
        }
        #endregion
    }

    public class TrackDescription
    {
        public int Id { get; set; }
        public string Name { get; set; } = string.Empty;
    }
}