/*
  $Id$
  */

AudioCaptchaAudioManager = function (context) {
    this.context = context;
    this.bufferList = {};
    this.playingSounds = {};
};


AudioCaptchaAudioManager.prototype = {
     addSound: function (url, callback) {
        // Load buffer asynchronously
        var request = new XMLHttpRequest();
        request.open("GET", url, true);//No I18N
        request.responseType = "arraybuffer";//No I18N

        var self = this;

        request.onload = function () {
            // Asynchronously decode the audio file data in request.response
            self.context.decodeAudioData(
                request.response,

                function (buffer) {
                   if (!buffer) {
                        return;
                    }

                    self.bufferList[url] = buffer;

                    if(callback) {
                        callback();
                    }
                });
        };

       

        request.send();
    },
    stopSoundWithUrl: function(url) {
        if(this.playingSounds.hasOwnProperty(url)){
            for(var i in this.playingSounds[url]){
                if(this.playingSounds[url].hasOwnProperty(i))
                    this.playingSounds[url][i].stop(0);
            }
        }
        
        
    }
};

/*
 * WebAudioAPISound Constructor
 */
 AudioCaptchaAudio = function (url, onLoadCallBack) {    
    this.url = url;
    window.audioCaptchaAudioManager = window.audioCaptchaAudioManager || new AudioCaptchaAudioManager(window.audioContext);
    this.manager = window.audioCaptchaAudioManager;

	// Safari suspends the audioContext once created. So, manuall resuming it once created.
	if(window.audioContext && window.audioContext.resume)
	{
	    window.audioContext.resume();
	}

    this.manager.addSound(this.url, onLoadCallBack);
};

/*
 * WebAudioAPISound Prototype
 */
AudioCaptchaAudio.prototype = {
    play: function () {
        var buffer = this.manager.bufferList[this.url];
        //Only play if it's loaded yet
        if (typeof buffer !== "undefined") {
            var source = this.makeSource(buffer);
            source.start(0);
            if(!this.manager.playingSounds.hasOwnProperty(this.url))
                this.manager.playingSounds[this.url] = [];
            this.manager.playingSounds[this.url].push(source);
        }
    },
    stop: function () {
        this.manager.stopSoundWithUrl(this.url);
    },
    getVolume: function () {
        return this.translateVolume(this.volume, true);
    },
    //Expect to receive in range 0-100
    setVolume: function (volume) {
        this.volume = this.translateVolume(volume);
    },
    translateVolume: function(volume, inverse){
        return inverse ? volume * 100 : volume / 100;
    },
    makeSource: function (buffer) {
        var source = this.manager.context.createBufferSource();
        var gainNode = this.manager.context.createGain();
        this.gainNode = gainNode;
        this.gainNode.gain.value = this.volume;
        source.buffer = buffer;
        source.connect(this.gainNode);
        this.gainNode.connect(this.manager.context.destination);
        return source;
    },
    disconnectSrc: function(){
	   if(this.gainNode != null)
	   {
			this.gainNode.disconnect(this.manager.context.destination);
	   }
    }
};