package com.flaremicro.audio;

import java.net.URL;
import java.util.Random;

public class AudioPlaylist implements AudioFinishedListener{
	
	
	private final AgnosticAudioSystem aas;
	
	public AudioPlaylist(AgnosticAudioSystem aas)
	{
		this.aas = aas;
	}
	
	String currentKey = null;
	int currentPlaylistIndex = 0;
	URL[] playlist = null;
	
	float currVol = 1F;
	private boolean stopped = true;
	
	public void setPlaylist(URL[] url)
	{
		this.playlist = url;
		this.currentPlaylistIndex = 0;
	}
	
	public void shuffle(){
		Random rand = new Random();
		
		for (int i = 0; i < playlist.length; i++) {
			int randomIndexToSwap = rand.nextInt(playlist.length);
			URL temp = playlist[randomIndexToSwap];
			playlist[randomIndexToSwap] = playlist[i];
			playlist[i] = temp;
		}
	}
	
	public void start()
	{
		stopped = false;
		currentPlaylistIndex = 0;
		aas.addAudioFinishedListener(this);
		if(currentKey == null && playlist != null && playlist.length > 0)
		{
			currentKey = aas.play(playlist[0]);
			aas.setVolume(currVol, currentKey);
		}
	}
	
	public void next()
	{
		if(playlist != null && playlist.length > 0)
		{
			currentPlaylistIndex = (currentPlaylistIndex + 1 ) % playlist.length;
			currentKey = aas.play(playlist[currentPlaylistIndex]);
			aas.setVolume(currVol, currentKey);
		}
	}
	
	public void audioFinished(String key, URL resource) {
		if(!stopped && key == currentKey)
		{
			next();
		}
	}

	public void setVolume(float volume) {
		currVol = volume;
		aas.setVolume(currVol, currentKey);
	}

	public void stop() {
		stopped = true;
		aas.stop(currentKey);
	}

	public float getVolume() {
		return currVol;
	}

}