package com.DanceAssassin 
{
	///////////////////////////////////////////////////////////////////////////
	// Doug Macdonald
	// http://www.dougwillsave.us
	//
	// Music engine: Contains a short song, split into 6 clips of 4 seconds
	// each. Keeps track of how much time has passed and, when necessary,
	// beings playing the next clip of the song. Additionally, this class
	// keeps track of what 'beat' of the song is currently playing; other parts
	// of the game logic reads this value in order to determine when actions
	// are performed in according with the beat.
	//
	// Because the song is split into short clips, the music will never be
	// out of sync with the gameplay for any longer than 4 seconds at a time,
	// eliminating a potential major problem when creating a rhythm game
	// in Flash.
	//
	// Created as part of a flash prototype developed for a class at DigiPen
	// Institute of Technology.
	//
	// © 2010 DigiPen (USA) Corporation
	///////////////////////////////////////////////////////////////////////////
	
	import org.flixel.*;

	public class Music extends FlxSprite
	{
		[Embed(source = '../../data/beat_1.mp3')] private var MusBeat1:Class;
		[Embed(source = '../../data/beat_2.mp3')] private var MusBeat2:Class;
		[Embed(source = '../../data/beat_3.mp3')] private var MusBeat3:Class;
		[Embed(source = '../../data/beat_4.mp3')] private var MusBeat4:Class;
		[Embed(source = '../../data/beat_5.mp3')] private var MusBeat5:Class;
		[Embed(source = '../../data/beat_6.mp3')] private var MusBeat6:Class;

		private var Song:Array = [1, 1, 2, 3, 2, 3, 4, 5, 4, 5, 6, 6, 4, 5, 4, 5];
		
		private var _time:Number;
		public var _ttb:Number;
		private var _index:int;
		
		public var _beat:int;
		
		public function Music() : void
		{
			_time = 0;
			_ttb = 0;
			_index = 0;
			_beat = 0;
			
		}
		
		override public function update() : void
		{
			_time += FlxG.elapsed;
			if (_time >= 4.0)
			{
				_time = 0;
				_ttb = 0;
				_beat = 0;
				_index++;
				if (_index == Song.length)
					_index = 0;
				
				StartTrack(Song[_index]);
			}
			else if (_ttb > 0.5)
			{
				_ttb -= 0.5;
			}
			else if (_time > 3.4)
				_beat = 7;
			else if (_time > 2.9)
				_beat = 6;
			else if (_time > 2.4)
				_beat = 5;
			else if (_time > 1.9)
				_beat = 4;
			else if (_time > 1.4)
				_beat = 3;
			else if (_time > 0.9)
				_beat = 2;
			else if (_time > 0.4)
				_beat = 1;
			
		}
		
		public function StartTrack(index:int): void
		{
			switch (index)
			{
				case 1:
				FlxG.play(MusBeat1);
				break;
				
				case 2:
				FlxG.play(MusBeat2);
				break;
				
				case 3:
				FlxG.play(MusBeat3);
				break;
				
				case 4:
				FlxG.play(MusBeat4);
				break;
				
				case 5:
				FlxG.play(MusBeat5);
				break;
				
				case 6:
				FlxG.play(MusBeat6);
				break;
			}
			
			
		}
		
	}

}