/**
 * @author mikael emtinger / http://gomo.se/
 */

THREE.Sound3D = function( sources, radius, volume, loop ) {
	
	THREE.Object3D.call( this );
	
	// flags
	
	this.isLoaded     = false;
	this.isAddedToDOM = false;
	this.isPlaying    = false;
	this.duration     = -1;
	this.radius       = radius !== undefined ? Math.abs( radius ) : 100;
	this.volume       = Math.min( 1, Math.max( 0, volume !== undefined ? volume : 1 ) );

	
	// dom

	this.domElement        = document.createElement( "audio" );
	this.domElement.volume = 0;
	this.domElement.pan    = 0;
	this.domElement.loop   = loop !== undefined ? loop : true;
		
	
	// init sources
		
	this.sources = sources instanceof Array ? sources : [ sources ];
	
	var element, source, type,
		s, sl = this.sources.length;
	
	for( s = 0; s < sl; s++ ) {
		
		source = this.sources[ s ];
		source.toLowerCase();
		
			 if( source.indexOf( ".mp3" ) !== -1 ) type = "audio/mpeg";	
		else if( source.indexOf( ".ogg" ) !== -1 ) type = "audio/ogg";
		else if( source.indexOf( ".wav" ) !== -1 ) type = "audio/wav";

		if( this.domElement.canPlayType( type ) ) {
			
			element     = document.createElement( "source" );
			element.src = this.sources[ s ];
			
			this.domElement.THREESound3D = this;
			this.domElement.appendChild( element );
			this.domElement.addEventListener( "canplay", this.onLoad, true );
			this.domElement.load();

			break;

		}

	}

};


THREE.Sound3D.prototype             = new THREE.Object3D();
THREE.Sound3D.prototype.constructor = THREE.Sound3D;
THREE.Sound3D.prototype.supr        = THREE.Object3D.prototype;


/*
 * OnLoad
 */

THREE.Sound3D.prototype.onLoad = function( ) {
	
	var sound3D = this.THREESound3D;
	
	if( sound3D.isLoaded )
		return;
	
	this.removeEventListener( "canplay", this.onLoad, true );
	
	sound3D.isLoaded = true;
	sound3D.duration = this.duration;
	
	if( sound3D.isPlaying )
		sound3D.play();

};

/*
 * Add To DOM
 */

THREE.Sound3D.prototype.addToDOM = function( parent ) {
	
	this.isAddedToDOM = true;
	parent.appendChild( this.domElement );

};


/*
 * Play
 */

THREE.Sound3D.prototype.play = function( startTime ) {
	
	this.isPlaying = true;
	
	if( this.isLoaded ) {
		
		this.domElement.play();
		
		if( startTime )
			this.domElement.currentTime = startTime % this.duration;

	}

};


/*
 * Pause
 */

THREE.Sound3D.prototype.pause = function() {
	
	this.isPlaying = false;
	this.domElement.pause();

};


/*
 * Stop
 */

THREE.Sound3D.prototype.stop = function(){

	this.isPlaying = false;
	this.domElement.pause();
	this.domElement.currentTime = 0;

};

/*
 * Calculate Volume and Pan
 */

THREE.Sound3D.prototype.calculateVolumeAndPan = function( cameraRelativePosition ) {
	
	var distance = cameraRelativePosition.length();	
	
	if( distance <= this.radius )
		this.domElement.volume = this.volume * ( 1 - distance / this.radius );
	else 
		this.domElement.volume = 0;

};


/*
 * Update
 */

THREE.Sound3D.prototype.update = function( parentGlobalMatrix, forceUpdate, camera ) {

	// update local (rotation/scale is not used)

	if( this.matrixAutoUpdate ) {
		
		this.localMatrix.setPosition( this.position );
		forceUpdate = true;

	}


	// update global

	if( forceUpdate || this.matrixNeedsUpdate ) {

		if( parentGlobalMatrix )
			this.globalMatrix.multiply( parentGlobalMatrix, this.localMatrix );
		else
			this.globalMatrix.copy( this.localMatrix );

		this.matrixNeedsUpdate = false;
		forceUpdate            = true;

	}


	// update children

	var i, l = this.children.length;

	for( i = 0; i < l; i++ )
		this.children[ i ].update( this.globalMatrix, forceUpdate, camera );

};