using System.IO;
// using DirectShowLib;
using LibVLCSharp;

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

        public MediaService()
        {
            Core.Initialize();
            _libVLC = new LibVLC(
                //  "--reset-plugins-cache",    //產生libvlc plugins設定cache,加快初次啟動速度,生成快取後註解關閉此設定。
                 "--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.Stopped)
            {
                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;
        }


        public void LoadMedia(string filePath, int audioTrackIndex = 0)
        {
            try
            {
                _mediaPlayer.Stop();
                _media?.Dispose();
                _media = new Media(filePath, FromType.FromPath);
                _mediaPlayer.Media = addMediaOption(_media, audioTrackIndex);
                _mediaPlayer.Play();
                _mediaPlayer.Fullscreen = true;
                _mediaPlayer.Mute = false;
                // _mediaPlayer.Stopped += (s, e) => Console.WriteLine("Player Stopped");
            }
            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(":audio-output=directsound");
            media.AddOption(":drop-late-frames");
            media.AddOption(":network-caching=300");
            media.AddOption(":live-caching=300");
            media.AddOption(":file-caching=300");
            // media.AddOption(":clock-jitter=0");
            // media.AddOption(":clock-synchro=0");
            media.AddOption($":audio-track={audioTrackIndex}");
            return media;
        }

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

        #region Volume
        public void SetVolume(int volume) => _mediaPlayer.SetVolume(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;
    }
    
    
}