using System;
using System.Diagnostics;
using UnityEngine;
using VirtualNes.Core;

public class AudioProvider : MonoBehaviour
{
    [SerializeField]
    private AudioSource m_as;

    private SoundBuffer _buffer = new SoundBuffer(4096);

    public void Initialize()
    {
        var dummy = AudioClip.Create("dummy", 1, 1, AudioSettings.outputSampleRate, false);

        dummy.SetData(new float[] { 1 }, 0);
        m_as.clip = dummy; //just to let unity play the audiosource
        m_as.loop = true;
        m_as.spatialBlend = 1;
        m_as.Play();
    }

    void OnAudioFilterRead(float[] data, int channels)
    {
        int step = channels;

        var bufferCount = _buffer.Available();

        for (int i = 0; i < data.Length; i += step)
        {
            float rawFloat = 0;
            if (_buffer.TryRead(out byte rawData))
                rawFloat = rawData / 255f;

            data[i] = rawFloat;
            for (int fill = 1; fill < step; fill++)
                data[i + fill] = rawFloat;

        }
    }

    public void ProcessSound(NES nes)
    {
        nes.apu.Process(_buffer, (uint)(Supporter.Config.sound.nRate * Time.deltaTime));
    }
}