var Wix = (function () {
    var _w = {
        /**
         * Constants
         */

        TPA_INTENT : "TPA",
        firstAddEventListenerCall: true,

        MessageTypes:{
            HEIGHT_CHANGED          :   "heightChanged",
            APP_SETTINGS_CHANGED    :   "appSettingsChanged",
            APP_IS_ALIVE            :   "appIsAlive",
            APP_SETTINGS_CLOSE      :   "appSettingsClose",
            APP_STATE_CHANGED       :   "appStateChanged",
            APP_SHOW_POPUP          :   "appShowPopup",
            SM_REQUEST_LOGIN        :   "pingpong:smRequestLogin",
            SM_CURRENT_MEMBER       :   "pingpong:smCurrentMember",
            SITE_INFO               :   "pingpong:siteInfo",
            EVENT_LISTENER_ADDED    :   "pingpong:addEventListener"
        },

        Events:{
            EDIT_MODE_CHANGE        : [],
            PAGE_NAVIGATION_CHANGE  : []
        },


        //FULL_VIEWPORT: 'fullViewport',

        /**
         * Functions
         */

        sendMessageInternal:function (type, data) {
            var target = parent.postMessage ? parent : (parent.document.postMessage ? parent.document : undefined);
            if (target && typeof target != "undefined") {
                target.postMessage(JSON.stringify({
                    intent: _w.TPA_INTENT,
                    compId: window.Wix.compId,
                    type:type,
                    data:data
                }), "*");
            }
        },

        /** Function sendPingPongMessage
         *  sends a post message to TPAManager (viewer) with message type and invokes the callback
         * @param type - a property of MessageTypes
         * @param callback
         * @param runMultipleTimes - optional, if set to true the post message callback isn't removed
         */
        sendPingPongMessage: function(type, callback, runMultipleTimes) {
            this.sendMessageInternal( type );

            var onMessageCallback = function ( evt ) {
                var postMessageData = JSON.parse( evt.data );
                if (postMessageData.intent == _w.TPA_INTENT) {
                    if (postMessageData.type == type && callback ) {
                        callback ( postMessageData.data );
                        if (!runMultipleTimes) {
                            this._removePostMessageCallback ( onMessageCallback );
                        }
                    }
                }
            }.bind(this);

            this.addPostMessageCallback( onMessageCallback );
        },

        addPostMessageCallback: function ( callback ) {
            var func = "addEventListener";
            var event = "message";
            if (window.attachEvent) {
                func = "attachEvent";
                event = "onmessage";
            }

            window[func](event, callback, false);
        },

        _removePostMessageCallback: function (callback) {
           var func = "removeEventListener";
           var event = "message";
           if (window.attachEvent) {
               func = "detachEvent";
               event = "onmessage";
           }

           window[func](event, callback, false);
        },

        getQueryParameter:function (parameterName) {
            var queryString = location.search.substring(1);
            parameterName += "=";
            if (queryString.length > 0) {
                var begin = queryString.indexOf(parameterName);
                if (begin != -1) {
                    begin += parameterName.length;
                    var end = queryString.indexOf("&", begin);
                    if (end == -1) {
                        end = queryString.length
                    }
                        return unescape(queryString.substring(begin, end));
                    }
                }
            return null;
        },

        receiver: function(event) {
            var data = JSON.parse(event.data);
            if (data.intent === "addEventListener") {
                this.Events[data.eventType].forEach(
                        function(callback) {
                            callback.apply(this, [data.params])
                        }
                );
            }
        }
    };

    var compId = _w.getQueryParameter("compId");

    return {

        Events:{
               EDIT_MODE_CHANGE: 'EDIT_MODE_CHANGE',
               PAGE_NAVIGATION_CHANGE: 'PAGE_NAVIGATION_CHANGE'
        },


        init: function (initObj) {
          window.Wix.compId = _w.getQueryParameter("compId") || (initObj ? initObj.compId : "[UNKNOWN]");
          _w.sendMessageInternal(_w.MessageTypes.APP_IS_ALIVE); // Send isAlive message
        },

        reportHeightChange:function (height) {
            _w.sendMessageInternal(_w.MessageTypes.HEIGHT_CHANGED, height);
        },

        pushState:function (state) {
           _w.sendMessageInternal(_w.MessageTypes.APP_STATE_CHANGED, state);
        },

        refreshApp:function ( queryParams ) {
            this.refreshAppByCompIds(null, queryParams);
        },

        refreshAppByCompIds: function (compIds, queryParams) {
            _w.sendMessageInternal(_w.MessageTypes.APP_SETTINGS_CHANGED, {'queryParams' : queryParams, 'compIds' : compIds});
        },

        isAlive:function () {
            _w.sendMessageInternal(_w.MessageTypes.APP_IS_ALIVE);
        },

        closeSettings: function() {
          _w.sendMessageInternal(_w.MessageTypes.APP_SETTINGS_CLOSE);
        },

        requestLogin: function( onSuccess ) {
            _w.sendPingPongMessage(_w.MessageTypes.SM_REQUEST_LOGIN, onSuccess);
        },

        getSiteInfo: function( onSuccess ) {
           _w.sendPingPongMessage(_w.MessageTypes.SITE_INFO, onSuccess);
        },

        currentMember: function (onSuccess) {
           _w.sendPingPongMessage(_w.MessageTypes.SM_CURRENT_MEMBER, onSuccess);
        },

        openPopup: function(url, size, minSize){
            var args = {
                url    : url,
                size   : size,
                minSize: minSize
            };
            _w.sendMessageInternal(_w.MessageTypes.APP_SHOW_POPUP, args);
        },
        
        addEventListener: function(eventName, callBack) {
            var callbacks = _w.Events[eventName] || [];
            callbacks.push(callBack);
            if (_w.firstAddEventListenerCall) {
                _w.addPostMessageCallback(_w.receiver.bind(_w));
                _w.firstAddEventListenerCall = false;
            }
        }
        
    }
})();

if (window.wixInit) {
  window.wixInit();
}
else {
  Wix.init();
}