using NAudio.Wave;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Resources;
using System.Text;
using System.Threading.Tasks;
using CDSAE3_Lian_Lian_Kan.Properties;
using NAudio.Wave.SampleProviders;
namespace CDSAE3_Lian_Lian_Kan.Sound
{
    public class SongFinishedEventArgs : EventArgs
    {
        public string SongName { get; set; }
        public SongFinishedEventArgs(string songName) => SongName = songName;
    }

    public delegate void SongFinishedEventHandler(Song_Audio_processer s, SongFinishedEventArgs e);
    public class Song_Audio_processer:IDisposable
    {
        AudioPlayer? audioPlayer;
        private List<string> audioFiles = new List<string>();
        public event SongFinishedEventHandler? SongFinished;
        int next_song = 1;
        private void OnPlaybackStopped(string s,object? obj)
        {
            SongFinished?.Invoke(this, new SongFinishedEventArgs(s));
            set_song(get_next_song());
        }
        public void pause_song()=> audioPlayer?.pause_song();
        public void resume_song()=> audioPlayer?.resume_song();
        public string get_last_song()
        {
            next_song+=audioFiles.Count-2;
            next_song %= audioFiles.Count;
            string name = audioFiles[next_song];
            next_song++;
            return name;
        }
        public string get_next_song()
        {
            string name = audioFiles[next_song];
            next_song++;
            next_song %= audioFiles.Count;
            return name;
        }

        /// <summary>
        /// 调整音乐音量
        /// </summary>
        /// <param name="val">音量大小 1-100</param>
        public void volume_change(int val)=> audioPlayer?.volume_change(val);
        public void set_albums(string s)
        {
            next_song = 0;
            var result = Etcs.musics.Where(x => x.Key == s).ToList();
            if (result.Count == 0)
                throw new Exception("no such album");
            audioFiles = result.First().Value;
            Etcs.setting.SetAlbum(result.First().Key);
        }
        internal void set_song(string s,int volume = -1,Action<string,AudioPlayer>? finished = null)
        {
            Etcs.setting.SetSongInfo(s);
            audioPlayer?.Dispose();
            try
            {
                audioPlayer = new AudioPlayer(s, volume == -1 ? Etcs.Song_Volume : volume, finished ?? OnPlaybackStopped);
            }
            catch (Exception e)
            {
                MessageBox.Show($"failed to play {s}\n{e.Message}");
                return;
            }
            audioPlayer.resume_song();
        }
        public void Dispose()
        {
            audioPlayer?.Dispose();
            GC.SuppressFinalize(this);
        }
        ~Song_Audio_processer() => Dispose();
    }
}