using CSCore;
using CSCore.Codecs.OGG;
using CSCore.CoreAudioAPI;
using CSCore.SoundOut;
using System;
using System.IO;

namespace BeatLyrics.Tool.Utils
{
    internal static class OggAudioPlayer
    {
        private static readonly ISoundOut SoundOut;
        private static IWaveSource _waveSource;

        static OggAudioPlayer()
        {
            using var mmDeviceEnumerator = new MMDeviceEnumerator();
            SoundOut = new WasapiOut { Latency = 1, Device = mmDeviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia) };
        }

        public static void LoadOggFile(string path)
        {
            Unload();
            var ms = new MemoryStream(File.ReadAllBytes(path));
            _waveSource = new OggSource(ms).ToWaveSource();
            SoundOut.Initialize(_waveSource);
        }

        public static void Play() => SoundOut.Play();

        public static void Stop() => SoundOut.Stop();

        public static void Unload()
        {
            if (_waveSource != null)
            {
                if (SoundOut.PlaybackState != PlaybackState.Stopped) SoundOut.Stop();
                _waveSource?.Dispose();
                _waveSource = null;
            }
        }

        public static TimeSpan Position
        {
            get => _waveSource.GetPosition();
            set
            {
                if (value <= TimeSpan.Zero) _waveSource.SetPosition(TimeSpan.Zero);
                else
                {
                    var len = _waveSource.GetLength();
                    _waveSource.SetPosition(value > len ? len.Add(TimeSpan.FromMilliseconds(-1)) : value.Add(TimeSpan.FromMilliseconds(-1)));
                }
            }
        }

        public static TimeSpan Length => _waveSource.GetLength();

        public static bool IsPlaying => SoundOut.PlaybackState == PlaybackState.Playing;
    }
}