/*
 * HTMLAudioPlugin
 * Visit http://createjs.com/ for documentation, updates and examples.
 *
 *
 * Copyright (c) 2012 gskinner.com, inc.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * @module SoundJS
 */

// namespace:
this.createjs = this.createjs || {};

(function () {

	"use strict";

	/**
	 * Play sounds using HTML <audio> tags in the browser. This plugin is the second priority plugin installed
	 * by default, after the {{#crossLink "WebAudioPlugin"}}{{/crossLink}}.  For older browsers that do not support html
	 * audio, include and install the {{#crossLink "FlashAudioPlugin"}}{{/crossLink}}.
	 *
	 * <h4>Known Browser and OS issues for HTML Audio</h4>
	 * <b>All browsers</b><br />
	 * Testing has shown in all browsers there is a limit to how many audio tag instances you are allowed.  If you exceed
	 * this limit, you can expect to see unpredictable results. Please use {{#crossLink "Sound.MAX_INSTANCES"}}{{/crossLink}} as
	 * a guide to how many total audio tags you can safely use in all browsers.  This issue is primarily limited to IE9.
	 *
     * <b>IE html limitations</b><br />
     * <ul><li>There is a delay in applying volume changes to tags that occurs once playback is started. So if you have
     * muted all sounds, they will all play during this delay until the mute applies internally. This happens regardless of
     * when or how you apply the volume change, as the tag seems to need to play to apply it.</li>
     * <li>MP3 encoding will not always work for audio tags if it's not default.  We've found default encoding with
     * 64kbps works.</li>
	 * <li>Occasionally very short samples will get cut off.</li>
	 * <li>There is a limit to how many audio tags you can load or play at once, which appears to be determined by
	 * hardware and browser settings.  See {{#crossLink "HTMLAudioPlugin.MAX_INSTANCES"}}{{/crossLink}} for a safe estimate.
	 * Note that audio sprites can be used as a solution to this issue.</li></ul>
	 *
	 * <b>Safari limitations</b><br />
	 * <ul><li>Safari requires Quicktime to be installed for audio playback.</li></ul>
	 *
	 * <b>iOS 6 limitations</b><br />
	 * <ul><li>can only have one &lt;audio&gt; tag</li>
	 * 		<li>can not preload or autoplay the audio</li>
	 * 		<li>can not cache the audio</li>
	 * 		<li>can not play the audio except inside a user initiated event.</li>
	 *		<li>Note it is recommended to use {{#crossLink "WebAudioPlugin"}}{{/crossLink}} for iOS (6+)</li>
	 * 		<li>audio sprites can be used to mitigate some of these issues and are strongly recommended on iOS</li>
	 * </ul>
	 *
	 * <b>Android Native Browser limitations</b><br />
	 * <ul><li>We have no control over audio volume. Only the user can set volume on their device.</li>
	 *      <li>We can only play audio inside a user event (touch/click).  This currently means you cannot loop sound or use a delay.</li></ul>
	 * <b> Android Chrome 26.0.1410.58 specific limitations</b><br />
	 * <ul> <li>Can only play 1 sound at a time.</li>
	 *      <li>Sound is not cached.</li>
	 *      <li>Sound can only be loaded in a user initiated touch/click event.</li>
	 *      <li>There is a delay before a sound is played, presumably while the src is loaded.</li>
	 * </ul>
	 *
	 * See {{#crossLink "Sound"}}{{/crossLink}} for general notes on known issues.
	 *
	 * @class HTMLAudioPlugin
	 * @extends AbstractPlugin
	 * @constructor
	 */
	function HTMLAudioPlugin() {
		this.AbstractPlugin_constructor();


	// Public Properties
		this._capabilities = s._capabilities;

		this._loaderClass = createjs.SoundLoader;
		this._soundInstanceClass = createjs.HTMLAudioSoundInstance;
	}

	var p = createjs.extend(HTMLAudioPlugin, createjs.AbstractPlugin);
	var s = HTMLAudioPlugin;

// Static Properties
	/**
	 * The maximum number of instances that can be loaded or played. This is a browser limitation, primarily limited to IE9.
	 * The actual number varies from browser to browser (and is largely hardware dependant), but this is a safe estimate.
	 * Audio sprites work around this limitation.
	 * @property MAX_INSTANCES
	 * @type {Number}
	 * @default 30
	 * @static
	 */
	s.MAX_INSTANCES = 30;

	/**
	 * Event constant for the "canPlayThrough" event for cleaner code.
	 * @property _AUDIO_READY
	 * @type {String}
	 * @default canplaythrough
	 * @static
	 * @private
	 */
	s._AUDIO_READY = "canplaythrough";

	/**
	 * Event constant for the "ended" event for cleaner code.
	 * @property _AUDIO_ENDED
	 * @type {String}
	 * @default ended
	 * @static
	 * @private
	 */
	s._AUDIO_ENDED = "ended";

	/**
	 * Event constant for the "seeked" event for cleaner code.  We utilize this event for maintaining loop events.
	 * @property _AUDIO_SEEKED
	 * @type {String}
	 * @default seeked
	 * @static
	 * @private
	 */
	s._AUDIO_SEEKED = "seeked";

	/**
	 * Event constant for the "stalled" event for cleaner code.
	 * @property _AUDIO_STALLED
	 * @type {String}
	 * @default stalled
	 * @static
	 * @private
	 */
	s._AUDIO_STALLED = "stalled";

	/**
	 * Event constant for the "timeupdate" event for cleaner code.  Utilized for looping audio sprites.
	 * This event callsback ever 15 to 250ms and can be dropped by the browser for performance.
	 * @property _TIME_UPDATE
	 * @type {String}
	 * @default timeupdate
	 * @static
	 * @private
	 */
	s._TIME_UPDATE = "timeupdate";

	/**
	 * The capabilities of the plugin. This is generated via the {{#crossLink "HTMLAudioPlugin/_generateCapabilities"}}{{/crossLink}}
	 * method. Please see the Sound {{#crossLink "Sound/capabilities:property"}}{{/crossLink}} method for an overview of all
	 * of the available properties.
	 * @property _capabilities
	 * @type {Object}
	 * @private
	 * @static
	 */
	s._capabilities = null;


// Static Methods
	/**
	 * Determine if the plugin can be used in the current browser/OS. Note that HTML audio is available in most modern
	 * browsers, but is disabled in iOS because of its limitations.
	 * @method isSupported
	 * @return {Boolean} If the plugin can be initialized.
	 * @static
	 */
	s.isSupported = function () {
		s._generateCapabilities();
		return (s._capabilities != null);
	};

	/**
	 * Determine the capabilities of the plugin. Used internally. Please see the Sound API {{#crossLink "Sound/capabilities:property"}}{{/crossLink}}
	 * method for an overview of plugin capabilities.
	 * @method _generateCapabilities
	 * @static
	 * @private
	 */
	s._generateCapabilities = function () {
		if (s._capabilities != null) {return;}
		var t = document.createElement("audio");
		if (t.canPlayType == null) {return null;}

		s._capabilities = {
			panning:false,
			volume:true,
			tracks:-1
		};

		// determine which extensions our browser supports for this plugin by iterating through Sound.SUPPORTED_EXTENSIONS
		var supportedExtensions = createjs.Sound.SUPPORTED_EXTENSIONS;
		var extensionMap = createjs.Sound.EXTENSION_MAP;
		for (var i = 0, l = supportedExtensions.length; i < l; i++) {
			var ext = supportedExtensions[i];
			var playType = extensionMap[ext] || ext;
			s._capabilities[ext] = (t.canPlayType("audio/" + ext) != "no" && t.canPlayType("audio/" + ext) != "") || (t.canPlayType("audio/" + playType) != "no" && t.canPlayType("audio/" + playType) != "");
		}  // OJR another way to do this might be canPlayType:"m4a", codex: mp4
	};


// public methods
	p.register = function (loadItem) {
		var tag = createjs.HTMLAudioTagPool.get(loadItem.src);
		var loader = this.AbstractPlugin_register(loadItem);
		loader.setTag(tag);

		return loader;
	};

	p.removeSound = function (src) {
		this.AbstractPlugin_removeSound(src);
		createjs.HTMLAudioTagPool.remove(src);
	};

	p.create = function (src, startTime, duration) {
		var si = this.AbstractPlugin_create(src, startTime, duration);
		si.playbackResource = null;
		return si;
	};

	p.toString = function () {
		return "[HTMLAudioPlugin]";
	};

	// plugin does not support these
	p.setVolume = p.getVolume = p.setMute = null;


	createjs.HTMLAudioPlugin = createjs.promote(HTMLAudioPlugin, "AbstractPlugin");
}());