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 Song_Audio_processer:IDisposable
    {
        //class Audio_File_Processor
        //{
        //    private Wave16ToFloatProvider? wave16ToFloatProvider;
        //    private List<string> audioFiles = new List<string>();
        //    int next_song = 0;
        //    int volume = 90;
        //    internal void set_Albums(string s)=>audioFiles = Settings.musics.TryGetValue(s, out List<string>? val) ? val : new List<string>();
        //    internal Wave16ToFloatProvider get_next_song()
        //    {
        //        string name = audioFiles[next_song];
        //        next_song++;
        //        next_song %= audioFiles.Count;
        //        name = name.Split('.').First().Replace(" ","_").Replace("-","_");
        //        object obj = Settings.res_Manager.GetObject(name, Settings.res_Culture)!;
        //        MemoryStream sound = new MemoryStream((byte[])obj);
        //        MemoryStream ms = new MemoryStream(StreamToBytes(sound));
        //        var ws = new Mp3FileReader(ms);
        //        BlockAlignReductionStream blockAlignReductionStream = new BlockAlignReductionStream(ws);
        //        wave16ToFloatProvider = new Wave16ToFloatProvider(blockAlignReductionStream);
        //        wave16ToFloatProvider.Volume = volume / 100f;
        //        return wave16ToFloatProvider;
        //    }
        //    internal Wave16ToFloatProvider get_last_song()
        //    {
        //        next_song = (next_song - 2 + audioFiles.Count) % audioFiles.Count;
        //        return get_next_song();
        //    }
        //    internal void volume_change(int val)
        //    {
        //        volume = val;
        //        if(wave16ToFloatProvider != null)
        //            wave16ToFloatProvider.Volume = volume / 100f;
        //    }
        //    internal static byte[] StreamToBytes(Stream stream)
        //    {
        //        long originalPosition = 0;

        //        if (stream.CanSeek)
        //        {
        //            originalPosition = stream.Position;
        //            stream.Position = 0;
        //        }

        //        try
        //        {
        //            byte[] readBuffer = new byte[4096];

        //            int totalBytesRead = 0;
        //            int bytesRead;

        //            while ((bytesRead = stream.Read(readBuffer, totalBytesRead, readBuffer.Length - totalBytesRead)) > 0)
        //            {
        //                totalBytesRead += bytesRead;

        //                if (totalBytesRead == readBuffer.Length)
        //                {
        //                    int nextByte = stream.ReadByte();
        //                    if (nextByte != -1)
        //                    {
        //                        byte[] temp = new byte[readBuffer.Length * 2];
        //                        Buffer.BlockCopy(readBuffer, 0, temp, 0, readBuffer.Length);
        //                        Buffer.SetByte(temp, totalBytesRead, (byte)nextByte);
        //                        readBuffer = temp;
        //                        totalBytesRead++;
        //                    }
        //                }
        //            }

        //            byte[] buffer = readBuffer;
        //            if (readBuffer.Length != totalBytesRead)
        //            {
        //                buffer = new byte[totalBytesRead];
        //                Buffer.BlockCopy(readBuffer, 0, buffer, 0, totalBytesRead);
        //            }
        //            return buffer;
        //        }
        //        finally
        //        {
        //            if (stream.CanSeek)
        //            {
        //                stream.Position = originalPosition;
        //            }
        //        }
        //    }

        //}
        AudioPlayer? audioPlayer;
        private List<string> audioFiles = new List<string>();
        int next_song = 1;
        private void OnPlaybackStopped(string s,object? obj)
        {
            set_song(get_next_song());
        }
        public void pause_song()=> audioPlayer?.pause_song();
        public void resume_song()=> audioPlayer?.resume_song();
        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)
        {
            var result = Etcs.musics.Where(x => x.Key == s).ToList();
            if (result.Count == 0)
                throw new Exception("no such album");
            audioFiles = result.First().Value;
        }
        public void set_song(string s)
        {
            audioPlayer?.Dispose();
            try
            {
                audioPlayer = new AudioPlayer(s, Etcs.Song_Volume, OnPlaybackStopped);
            }
            catch (Exception e)
            {
                MessageBox.Show($"failed to play {s}\n{e.Message}");
                return;
            }
            audioPlayer.resume_song();
        }
        public void Dispose()=> audioPlayer?.Dispose();
        ~Song_Audio_processer() => Dispose();
    }
}