using NAudio.Wave;
using NAudio.Wave.SampleProviders;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows;

namespace QuikDawEditor.EditingClasses;

public class ClipStream
{
    public WaveStream clipWaveStreamNormal;
    public WaveStream clipWaveStreamReversed;

    public string baseFileName = "";

    public ClipStream(string fileName)
    {
        switch (Path.GetExtension(fileName))
        {
            case ".mp3":
                clipWaveStreamNormal = new Mp3FileReader(fileName);
                break;

            case ".wav":
                clipWaveStreamNormal = new WaveFileReader(fileName);
                break;
        }

        baseFileName = Path.GetFileName(fileName);

    }

    public void CreateReversedWaveStream()
    {
        WaveFormat createWaveFormat = clipWaveStreamNormal.WaveFormat;
        //Reverse the stream
        List<float> revbufferlist = new List<float>();
        clipWaveStreamNormal.Position = 0;
        float[] revBuffer = new float[createWaveFormat.SampleRate];

        //ISampleProvider sourceProvider = new WdlResamplingSampleProvider(clipWaveStreamNormal.ToSampleProvider(), 44100);
        ISampleProvider sourceProvider = null;

        //Force resample to 44100 
        switch (createWaveFormat.SampleRate)
        {
            case 44100:
                sourceProvider = new WdlResamplingSampleProvider(clipWaveStreamNormal.ToSampleProvider(), 44100);
                break;
            case 48000:
                sourceProvider = new WdlResamplingSampleProvider(clipWaveStreamNormal.ToSampleProvider(), 48000);
                break;
        }


        int read;
        do
        {
            Array.Clear(revBuffer, 0, revBuffer.Length);
            read = sourceProvider.Read(revBuffer, 0, revBuffer.Length);
            revbufferlist.AddRange(revBuffer);
        }
        while (read > 0);

        revbufferlist.Reverse();
        //revBuffer = revbufferlist.Skip(44100).ToArray();  // Remove 1 sec of silence at end which is moved to front when reversed
        revBuffer = revbufferlist.Skip(createWaveFormat.SampleRate * 2 / createWaveFormat.Channels).ToArray();  // Remove 1 sec of silence at end which is moved to front when reversed

        MemoryStream mstream = new MemoryStream();
        WaveFileWriter recordingWFWriter = new WaveFileWriter(mstream, createWaveFormat);
        mstream.Position = 0;
        recordingWFWriter.WriteSamples(revBuffer, 0, revBuffer.Length);
        mstream.Position = 0;

        //myClipStream.clipWaveStream = new WaveFileReader(mstream);  //Error because "no riff wave header";
        clipWaveStreamReversed = new RawSourceWaveStream(mstream, createWaveFormat);
        clipWaveStreamReversed.Position = 0;
        //Don't close the new stream
        //recordingWFWriter.Close(); can't do this
    }

    //public void Close()
    //{
    //    clipWuseWaveStream.Close();
    //    useWaveStream.Dispose();
    //}
}