package me.despawningbone.discordbot.command.music;

import java.nio.ByteBuffer;

import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
import com.sedmelluq.discord.lavaplayer.track.playback.AudioFrame;
import net.dv8tion.jda.api.audio.AudioSendHandler;

/**
 * Boilerplate class entirely from https://github.com/sedmelluq/lavaplayer/tree/master/demo-jda/src/main/java/com/sedmelluq/discord/lavaplayer/demo/jda
 * <p>
 * This is a wrapper around AudioPlayer which makes it behave as an AudioSendHandler for JDA. As JDA calls canProvide
 * before every call to provide20MsAudio(), we pull the frame in canProvide() and use the frame we already pulled in
 * provide20MsAudio().
 */
public class AudioPlayerSendHandler implements AudioSendHandler {
  private final AudioPlayer audioPlayer;
  private AudioFrame lastFrame;

  /**
   * @param audioPlayer Audio player to wrap.
   */
  public AudioPlayerSendHandler(AudioPlayer audioPlayer) {
    this.audioPlayer = audioPlayer;
  }
  
  @Override
  public boolean canProvide() {
    lastFrame = audioPlayer.provide();
    return lastFrame != null;
  }
  
  @Override
  public ByteBuffer provide20MsAudio() {
    return ByteBuffer.wrap(lastFrame.getData());
  }

  @Override
  public boolean isOpus() {
    return true;
  }
}