/**
 * VERSION: 1.2
 * DATE: 2010-07-22
 * AS3
 * UPDATES AND DOCS AT: http://www.greensock.com/loadermax/
 **/
package com.greensock.loading {
	import com.greensock.events.LoaderEvent;
	import com.greensock.loading.core.LoaderItem;
	
	import flash.events.Event;
	import flash.events.ProgressEvent;
	import flash.media.Sound;
	import flash.media.SoundLoaderContext;
/**
 * Loads an MP3 audio file. <br /><br />
 * 
 * <strong>OPTIONAL VARS PROPERTIES</strong><br />
 * The following special properties can be passed into the MP3Loader constructor via its <code>vars</code> parameter:<br />
 * <ul>
 * 		<li><strong> name : String</strong> - A name that is used to identify the MP3Loader instance. This name can be fed to the <code>find()</code> method or traced at any time. Each loader's name should be unique. If you don't define one, a unique name will be created automatically, like "loader21".</li>
 * 		<li><strong> autoPlay : Boolean</strong> - If <code>autoPlay</code> is <code>true</code>, the MP3 will begin playing immediately when the <code>COMPLETE</code> event fires. The default value is <code>false</code>.</li>
 * 		<li><strong> repeat : int</strong> - Number of times that the mp3 should repeat. To repeat indefinitely, use -1. Default is 0.</li>
 * 		<li><strong> alternateURL : String</strong> - If you define an <code>alternateURL</code>, the loader will initially try to load from its original <code>url</code> and if it fails, it will automatically (and permanently) change the loader's <code>url</code> to the <code>alternateURL</code> and try again. Think of it as a fallback or backup <code>url</code>. It is perfectly acceptable to use the same <code>alternateURL</code> for multiple loaders (maybe a default image for various ImageLoaders for example).</li>
 * 		<li><strong> context : SoundLoaderContext</strong> - To control things like the buffer time and whether or not a policy file is checked, define a <code>SoundLoaderContext</code> object. The default context is null. See Adobe's SoundLoaderContext documentation for details.</li>
 * 		<li><strong> noCache : Boolean</strong> - If <code>noCache</code> is <code>true</code>, a "cacheBusterID" parameter will be appended to the url with a random set of numbers to prevent caching (don't worry, this info is ignored when you <code>getLoader()</code> or <code>getContent()</code> by url and when you're running locally)</li>
 * 		<li><strong> estimatedBytes : uint</strong> - Initially, the loader's <code>bytesTotal</code> is set to the <code>estimatedBytes</code> value (or <code>LoaderMax.defaultEstimatedBytes</code> if one isn't defined). Then, when the loader begins loading and it can accurately determine the bytesTotal, it will do so. Setting <code>estimatedBytes</code> is optional, but the more accurate the value, the more accurate your loaders' overall progress will be initially. If the loader will be inserted into a LoaderMax instance (for queue management), its <code>auditSize</code> feature can attempt to automatically determine the <code>bytesTotal</code> at runtime (there is a slight performance penalty for this, however - see LoaderMax's documentation for details).</li>
 * 		<li><strong> requireWithRoot : DisplayObject</strong> - LoaderMax supports <i>subloading</i>, where an object can be factored into a parent's loading progress. If you want LoaderMax to require this MP3Loader as part of its parent SWFLoader's progress, you must set the <code>requireWithRoot</code> property to your swf's <code>root</code>. For example, <code>var loader:MP3Loader = new MP3Loader("audio.mp3", {name:"audio", requireWithRoot:this.root});</code></li>
 * 		<li><strong> autoDispose : Boolean</strong> - When <code>autoDispose</code> is <code>true</code>, the loader will be disposed immediately after it completes (it calls the <code>dispose()</code> method internally after dispatching its <code>COMPLETE</code> event). This will remove any listeners that were defined in the vars object (like onComplete, onProgress, onError, onInit). Once a loader is disposed, it can no longer be found with <code>LoaderMax.getLoader()</code> or <code>LoaderMax.getContent()</code> - it is essentially destroyed but its content is not unloaded (you must call <code>unload()</code> or <code>dispose(true)</code> to unload its content). The default <code>autoDispose</code> value is <code>false</code>.
 * 		
 * 		<br /><br />----EVENT HANDLER SHORTCUTS----</li>
 * 		<li><strong> onOpen : Function</strong> - A handler function for <code>LoaderEvent.OPEN</code> events which are dispatched when the loader begins loading. Make sure your onOpen function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * 		<li><strong> onInit : Function</strong> - A handler function for <code>Event.INIT</code> events which will be dispatched when the MP3 has streamed enough of its content to identify the ID3 meta data. Make sure your onInit function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * 		<li><strong> onProgress : Function</strong> - A handler function for <code>LoaderEvent.PROGRESS</code> events which are dispatched whenever the <code>bytesLoaded</code> changes. Make sure your onProgress function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>). You can use the LoaderEvent's <code>target.progress</code> to get the loader's progress value or use its <code>target.bytesLoaded</code> and <code>target.bytesTotal</code>.</li>
 * 		<li><strong> onComplete : Function</strong> - A handler function for <code>LoaderEvent.COMPLETE</code> events which are dispatched when the loader has finished loading successfully. Make sure your onComplete function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * 		<li><strong> onCancel : Function</strong> - A handler function for <code>LoaderEvent.CANCEL</code> events which are dispatched when loading is aborted due to either a failure or because another loader was prioritized or <code>cancel()</code> was manually called. Make sure your onCancel function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * 		<li><strong> onError : Function</strong> - A handler function for <code>LoaderEvent.ERROR</code> events which are dispatched whenever the loader experiences an error (typically an IO_ERROR or SECURITY_ERROR). An error doesn't necessarily mean the loader failed, however - to listen for when a loader fails, use the <code>onFail</code> special property. Make sure your onError function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * 		<li><strong> onFail : Function</strong> - A handler function for <code>LoaderEvent.FAIL</code> events which are dispatched whenever the loader fails and its <code>status</code> changes to <code>LoaderStatus.FAILED</code>. Make sure your onFail function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * 		<li><strong> onIOError : Function</strong> - A handler function for <code>LoaderEvent.IO_ERROR</code> events which will also call the onError handler, so you can use that as more of a catch-all whereas <code>onIOError</code> is specifically for LoaderEvent.IO_ERROR events. Make sure your onIOError function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
 * </ul><br />
 * 
 * <code>content</code> data type: <strong><code>flash.media.Sound</code></strong><br /><br />
 * 
 * <strong>NOTE:</strong> To avoid garbage collection issues in the Flash player, the <code>Sound</code> 
 * object that MP3Loader employs must get recreated internally anytime the MP3Loader is unloaded or its loading 
 * is cancelled, so it is best to access the <code>content</code> after the <code>COMPLETE</code>
 * event has been dispatched. Otherwise, if you store a reference to the MP3Loader's <code>content</code>
 * before or during a load and it gets cancelled or unloaded for some reason, the <code>Sound</code> object 
 * won't be the one into which the MP3 is eventually loaded.<br /><br />
 * 
 * @example Example AS3 code:<listing version="3.0">
 import com.greensock.loading.~~;
 import com.greensock.events.LoaderEvent;
 
 //create a MP3Loader that will begin playing immediately when it loads
 var loader:MP3Loader = new MP3Loader("mp3/audio.mp3", {name:"audio", autoPlay:true, repeat:3, estimatedBytes:9500});
 
 //begin loading
 loader.load();
 
 //Or you could put the MP3Loader into a LoaderMax. Create one first...
 var queue:LoaderMax = new LoaderMax({name:"mainQueue", onProgress:progressHandler, onComplete:completeHandler, onError:errorHandler});
 
 //append the MP3Loader and several other loaders
 queue.append( loader );
 queue.append( new XMLLoader("xml/doc.xml", {name:"xmlDoc", estimatedBytes:425}) );
 queue.append( new ImageLoader("img/photo1.jpg", {name:"photo1", estimatedBytes:3500}) );
 
 //start loading
 queue.load();
 
 //pause loading
 queue.pause();
 
 //resume loading
 queue.resume();
 
 function progressHandler(event:LoaderEvent):void {
 		trace("progress: " + event.target.progress);
 }
 
 function completeHandler(event:LoaderEvent):void {
 		trace(event.target + " is complete!");
 }
 
 function errorHandler(event:LoaderEvent):void {
 		trace("error occured with " + event.target + ": " + event.text);
 }
 </listing>
 * 
 * <b>Copyright 2010, GreenSock. All rights reserved.</b> This work is subject to the terms in <a href="http://www.greensock.com/terms_of_use.html">http://www.greensock.com/terms_of_use.html</a> or for corporate Club GreenSock members, the software agreement that was issued with the corporate membership.
 * 
 * @author Jack Doyle, jack@greensock.com
 */	
	public class MP3Loader extends LoaderItem {
		/** @private **/
		private static var _classActivated:Boolean = _activateClass("MP3Loader", MP3Loader, "mp3");
		/** @private **/
		protected var _sound:Sound;
		/** @private **/
		protected var _context:SoundLoaderContext;
		
		/**
		 * Constructor.
		 * 
		 * @param urlOrRequest The url (<code>String</code>) or <code>URLRequest</code> from which the loader should get its content
		 * @param vars An object containing optional configuration details. For example: <code>new MP3Loader("mp3/audio.mp3", {name:"audio", autoPlay:true, onComplete:completeHandler, onProgress:progressHandler})</code>.<br /><br />
		 * 
		 * The following special properties can be passed into the constructor via the <code>vars</code> parameter:<br />
		 * <ul>
		 * 		<li><strong> name : String</strong> - A name that is used to identify the MP3Loader instance. This name can be fed to the <code>find()</code> method or traced at any time. Each loader's name should be unique. If you don't define one, a unique name will be created automatically, like "loader21".</li>
		 * 		<li><strong> autoPlay : Boolean</strong> - If <code>autoPlay</code> is <code>true</code>, the MP3 will begin playing immediately when the <code>COMPLETE</code> event fires. The default value is <code>false</code>.</li>
		 * 		<li><strong> repeat : int</strong> - Number of times that the mp3 should repeat. To repeat indefinitely, use -1. Default is 0.</li>
		 * 		<li><strong> alternateURL : String</strong> - If you define an <code>alternateURL</code>, the loader will initially try to load from its original <code>url</code> and if it fails, it will automatically (and permanently) change the loader's <code>url</code> to the <code>alternateURL</code> and try again. Think of it as a fallback or backup <code>url</code>. It is perfectly acceptable to use the same <code>alternateURL</code> for multiple loaders (maybe a default image for various ImageLoaders for example).</li>
		 * 		<li><strong> context : SoundLoaderContext</strong> - To control things like the buffer time and whether or not a policy file is checked, define a <code>SoundLoaderContext</code> object. The default context is null. See Adobe's SoundLoaderContext documentation for details.</li>
		 * 		<li><strong> noCache : Boolean</strong> - If <code>noCache</code> is <code>true</code>, a "cacheBusterID" parameter will be appended to the url with a random set of numbers to prevent caching (don't worry, this info is ignored when you <code>getLoader()</code> or <code>getContent()</code> by url and when you're running locally)</li>
		 * 		<li><strong> estimatedBytes : uint</strong> - Initially, the loader's <code>bytesTotal</code> is set to the <code>estimatedBytes</code> value (or <code>LoaderMax.defaultEstimatedBytes</code> if one isn't defined). Then, when the loader begins loading and it can accurately determine the bytesTotal, it will do so. Setting <code>estimatedBytes</code> is optional, but the more accurate the value, the more accurate your loaders' overall progress will be initially. If the loader will be inserted into a LoaderMax instance (for queue management), its <code>auditSize</code> feature can attempt to automatically determine the <code>bytesTotal</code> at runtime (there is a slight performance penalty for this, however - see LoaderMax's documentation for details).</li>
		 * 		<li><strong> requireWithRoot : DisplayObject</strong> - LoaderMax supports <i>subloading</i>, where an object can be factored into a parent's loading progress. If you want LoaderMax to require this MP3Loader as part of its parent SWFLoader's progress, you must set the <code>requireWithRoot</code> property to your swf's <code>root</code>. For example, <code>var loader:MP3Loader = new MP3Loader("audio.mp3", {name:"audio", requireWithRoot:this.root});</code></li>
		 * 		<li><strong> autoDispose : Boolean</strong> - When <code>autoDispose</code> is <code>true</code>, the loader will be disposed immediately after it completes (it calls the <code>dispose()</code> method internally after dispatching its <code>COMPLETE</code> event). This will remove any listeners that were defined in the vars object (like onComplete, onProgress, onError, onInit). Once a loader is disposed, it can no longer be found with <code>LoaderMax.getLoader()</code> or <code>LoaderMax.getContent()</code> - it is essentially destroyed but its content is not unloaded (you must call <code>unload()</code> or <code>dispose(true)</code> to unload its content). The default <code>autoDispose</code> value is <code>false</code>.
		 * 		
		 * 		<br /><br />----EVENT HANDLER SHORTCUTS----</li>
		 * 		<li><strong> onOpen : Function</strong> - A handler function for <code>LoaderEvent.OPEN</code> events which are dispatched when the loader begins loading. Make sure your onOpen function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * 		<li><strong> onInit : Function</strong> - A handler function for <code>Event.INIT</code> events which will be dispatched when the MP3 has streamed enough of its content to identify the ID3 meta data. Make sure your onInit function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * 		<li><strong> onProgress : Function</strong> - A handler function for <code>LoaderEvent.PROGRESS</code> events which are dispatched whenever the <code>bytesLoaded</code> changes. Make sure your onProgress function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>). You can use the LoaderEvent's <code>target.progress</code> to get the loader's progress value or use its <code>target.bytesLoaded</code> and <code>target.bytesTotal</code>.</li>
		 * 		<li><strong> onComplete : Function</strong> - A handler function for <code>LoaderEvent.COMPLETE</code> events which are dispatched when the loader has finished loading successfully. Make sure your onComplete function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * 		<li><strong> onCancel : Function</strong> - A handler function for <code>LoaderEvent.CANCEL</code> events which are dispatched when loading is aborted due to either a failure or because another loader was prioritized or <code>cancel()</code> was manually called. Make sure your onCancel function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * 		<li><strong> onError : Function</strong> - A handler function for <code>LoaderEvent.ERROR</code> events which are dispatched whenever the loader experiences an error (typically an IO_ERROR or SECURITY_ERROR). An error doesn't necessarily mean the loader failed, however - to listen for when a loader fails, use the <code>onFail</code> special property. Make sure your onError function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * 		<li><strong> onFail : Function</strong> - A handler function for <code>LoaderEvent.FAIL</code> events which are dispatched whenever the loader fails and its <code>status</code> changes to <code>LoaderStatus.FAILED</code>. Make sure your onFail function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * 		<li><strong> onIOError : Function</strong> - A handler function for <code>LoaderEvent.IO_ERROR</code> events which will also call the onError handler, so you can use that as more of a catch-all whereas <code>onIOError</code> is specifically for LoaderEvent.IO_ERROR events. Make sure your onIOError function accepts a single parameter of type <code>LoaderEvent</code> (<code>com.greensock.events.LoaderEvent</code>).</li>
		 * </ul>
		 */
		public function MP3Loader(urlOrRequest:*, vars:Object=null) {
			super(urlOrRequest, vars);
			_type = "MP3Loader";
			_initSound();
		}
		
		/** @private **/
		protected function _initSound():void {
			if (_sound != null) {
				try {
					_sound.close();
				} catch (error:Error) {
					
				}
				_sound.removeEventListener(ProgressEvent.PROGRESS, _progressHandler);
				_sound.removeEventListener(Event.COMPLETE, _completeHandler);
				_sound.removeEventListener("ioError", _failHandler);
				_sound.removeEventListener(Event.ID3, _id3Handler);
			}
			_sound = _content = new Sound();
			_sound.addEventListener(ProgressEvent.PROGRESS, _progressHandler, false, 0, true);
			_sound.addEventListener(Event.COMPLETE, _completeHandler, false, 0, true);
			_sound.addEventListener("ioError", _failHandler, false, 0, true);
			_sound.addEventListener(Event.ID3, _id3Handler, false, 0, true);
		}
		
		/** @private **/
		override protected function _load():void {
			_context = (this.vars.context is SoundLoaderContext) ? this.vars.context : null;
			_prepRequest();
			_sound.load(_request, _context);
		}
		
		/** @private scrubLevel: 0 = cancel, 1 = unload, 2 = dispose, 3 = flush **/
		override protected function _dump(scrubLevel:int=0, newStatus:int=0, suppressEvents:Boolean=false):void {
			_initSound();
			super._dump(scrubLevel, newStatus);
			_content = _sound;
		}
		
//---- EVENT HANDLERS ------------------------------------------------------------------------------------
		
		/** @private **/
		protected function _id3Handler(event:Event):void {
			dispatchEvent(new LoaderEvent(LoaderEvent.INIT, this));
		}
		
		/** @private **/
		override protected function _completeHandler(event:Event=null):void {
			if (this.vars.autoPlay) {
				_sound.play(0, ((this.vars.repeat == -1) ? 9999999 : uint(this.vars.repeat) + 1));
			}
			super._completeHandler(event);
		}
		
		
//---- GETTERS / SETTERS -------------------------------------------------------------------------
		
		
	}
}