var hyEM = {
  log: function(){
    if(this.config.debug) {
      console.log.apply(console, arguments);
    }
  },
  
  pushToDataLayer: function (h) {
    window.dataLayer = window.dataLayer || [];
    
    if (h.event == "hyly_interaction") {
      if (this.config.interaction_events) {
        dataLayer.push(h);
      }
    } else {
      dataLayer.push(h);
    }
    
    // for extension
    this.events.push({
      eventTime: (new Date()).toLocaleTimeString(),
      eventData: h
    });
    
    window.postMessage({ type: "FROM_PAGE", events: this.events}, "*");
  },
  
  setupEventListener: function () {
    var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent",
      eventer = window[eventMethod],
      messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
    
    eventer(messageEvent, function(e) {
      try {
        var eventHash = JSON.parse(e.message || e.data); // eventHash was stringified
      } catch(ex) {
        var eventHash = {}; // ignore unknown event
      }
      
      var appName = eventHash.appName;
        
      if (eventHash.originEvent) {
        eventHash.event = eventHash.originEvent;
        delete eventHash["originEvent"];
        delete eventHash["appName"];
      }
      if (eventHash.eventCategory) {
        if (appName == "Hy.ly hyTours" && hyEM.config.hytours_events || appName == "Hy.ly hyForms" && hyEM.config.hyforms_events || appName == "Hy.ly Tour Site" && hyEM.config.toursite_events) {
          hyEM.pushToDataLayer(eventHash);
        }
      }
      
    }, false);
  },
  
  // GTM template tag will pass the configuration like
  // hyEM.init({env: 'dev', 'debug': true, ...});
  init: function(data){
    this.config = data || {};
    this.events = [];
    
    if (self!=top) {
      // iframe
    } else {
      this.setupEventListener(); 
    }
  }
}