var pbs = [];
function PB(iframe) {
    if (typeof(iframe) == 'string') {
        iframe = document.querySelector(iframe);
    }

    if (!iframe){
        throw new Error('Not found player iframe');
    }

    this._iframe = iframe;
    pbs.push(this);

    this.eventListeners = {};
}

function searchInPBs(win) {
    for (var i in pbs) {
        if (pbs[i]._iframe.contentWindow == win) {
            return i;
        }
    }

    return -1;
}


PB.prototype.bind = function (event, callback) {
    if (!(this.eventListeners[event] instanceof Array)) {
        this.eventListeners[event] = [];
    }

    this.eventListeners[event].push(callback);
    this._iframe.addEventListener(event, callback,false);
};
PB.prototype.unbind = function (event,callback) {
    if(callback){
        var index = this.eventListeners[event].indexOf(callback);
        this._iframe.removeEventListener(event, callback,false);
        if(index !== -1){
            this.eventListeners[event].pop(index);
        }
    }else{
        if (this.eventListeners[event] instanceof Array) {
            for (var i in this.eventListeners[event]) {
                this._iframe.removeEventListener(event, this.eventListeners[event][i],false);
            }
            this.eventListeners[event] = [];
        }
    }

};

PB.prototype.reload = function (url, options) {
    //check url is player url
    if(url.search('/media/player') === -1 && url.search('/player-v2/') === -1){
        throw new Error("url is not active Podbean player");
    }

    if (typeof(options) === 'object'){
        var urlSplit = url.split('?');
        var urlParamsOrig = urlSplit[1].split('&');
        var urlParams = {};
        for(var k in urlParamsOrig){
            var kv = urlParamsOrig[k].split('=');
            urlParams[kv[0]] = kv[1];
        }

        for(k in options){
            urlParams[k] = options[k];
        }
        var queryString = '?api=1';
        for(k in urlParams){
            queryString += ('&' + k + '=' + urlParams[k]);
        }

        queryString = queryString.trim('&');
        url = urlSplit[0] + queryString;
    }
    this._iframe.src = url;
};

PB.prototype.play = function () {
    this._post({action: "PB.Widget.API.PLAY"});
};
PB.prototype.pause = function () {
    this._post({action: "PB.Widget.API.PAUSE"});
};
PB.prototype.next = function () {
    this._post({action: "PB.Widget.API.NEXT"});
};
PB.prototype.prev = function () {
    this._post({action: "PB.Widget.API.PREV"});
};

PB.prototype.toggle = function () {
    this._post({action: "PB.Widget.API.TOGGLE"});
};

PB.prototype.seekTo = function (millisecond) {
    this._post({action: "PB.Widget.API.SEEK_TO",value:millisecond});
};
PB.prototype.setVolume = function (volumnNumber) {
    this._post({action: "PB.Widget.API.SET_VOLUME",value:volumnNumber});
};
PB.prototype.skip = function (index) {
    this._post({action: "PB.Widget.API.SKIP",value:index});
};







//getter
//returns the current volume, in the range of [0, 100].
PB.prototype.getVolume = function(callback){
    this._getter('GET_VOLUME',callback);
};
//returns current sound duration in milliseconds.
PB.prototype.getDuration = function(callback){
    this._getter('GET_DURATION',callback);
};
//returns current sound position in milliseconds.
PB.prototype.getPosition = function(callback){
    this._getter('GET_POSITION',callback);
};
//whether the widget is paused.
PB.prototype.isPaused = function(callback) {
    this._getter('GET_PAUSED',callback);
};
//returns the list of sound objects.
PB.prototype.getSources = function(callback){
    this._getter('GET_SOURCES',callback);
};
//returns current sound object.
PB.prototype.getCurrentSource = function(callback){
    this._getter('GET_CURRENTSOURCE',callback);
};
//returns the index of current sound.
PB.prototype.getCurrentSourceIndex = function(callback){
    this._getter('GET_CURRENTSOURCEINDEX',callback);
};



PB.prototype._post = function (msg) {
    this._iframe.contentWindow.postMessage(msg, '*');
};

PB.prototype._getter = function (eventName,callback) {
    var self = this;
    var cb = function(event){
        callback(event.data);
        self.unbind('PB.Widget.API.CALLBACK.'+eventName,cb);
    }
    this.bind('PB.Widget.API.CALLBACK.'+eventName,cb);

    this._post({action:'PB.Widget.API.'+eventName});
};

window.addEventListener('message', function (event) {
    if (event.data.event && event.data.event.search('PB.Widget.') != -1
    ) {
        var index = searchInPBs(event.source);
        if (index != -1) {
            var e = new Event(event.data.event);
            e.data = event.data.data;
            pbs[index]._iframe.dispatchEvent(e);
        }
    }
});