text: /* Magic Mirror
   * Node Helper: Calendar
   *
   * By Michael Teeuw http://michaelteeuw.nl
   * MIT Licensed.
   */
  
  var NodeHelper = require("node_helper");
  var validUrl = require("valid-url");
  var CalendarFetcher = require("./calendarfetcher.js");
  
  module.exports = NodeHelper.create({
  	// Override start method.
  	start: function() {
  		var events = [];
  
  		this.fetchers = [];
  
  		console.log("Starting node helper for: " + this.name);
  
  	},
  
  	// Override socketNotificationReceived method.
  	socketNotificationReceived: function(notification, payload) {
  		if (notification === "ADD_CALENDAR") {
  			//console.log('ADD_CALENDAR: ');
  			this.createFetcher(payload.url, payload.fetchInterval, payload.maximumEntries, payload.maximumNumberOfDays, payload.auth);
  		}
  	},
  
  	/* createFetcher(url, reloadInterval)
  	 * Creates a fetcher for a new url if it doesn't exist yet.
  	 * Otherwise it reuses the existing one.
  	 *
  	 * attribute url string - URL of the news feed.
  	 * attribute reloadInterval number - Reload interval in milliseconds.
  	 */
  
  	createFetcher: function(url, fetchInterval, maximumEntries, maximumNumberOfDays, auth) {
  		var self = this;
  /*
  		if (!validUrl.isUri(url)) {
  			console.log("INCORRECT_URL");
  			self.sendSocketNotification("INCORRECT_URL", {url: url});
  			return;
  		}
  */
  		var fetcher;
  		if (typeof self.fetchers[url] === "undefined") {
  			console.log("Create new calendar fetcher for url: " + url + " - Interval: " + fetchInterval);
  			fetcher = new CalendarFetcher(url, fetchInterval, maximumEntries, maximumNumberOfDays, auth);
  
  			fetcher.onReceive(function(fetcher) {
  				//console.log('Broadcast events.');
  				//console.log(fetcher.events());
  
  				self.sendSocketNotification("CALENDAR_EVENTS", {
  					url: fetcher.url(),
  					events: fetcher.events()
  				});
  			});
  
  			fetcher.onError(function(fetcher, error) {
  				self.sendSocketNotification("FETCH_ERROR", {
  					url: fetcher.url(),
  					error: error
  				});
  			});
  
  			self.fetchers[url] = fetcher;
  		} else {
  			//console.log('Use existing news fetcher for url: ' + url);
  			fetcher = self.fetchers[url];
  			fetcher.broadcastEvents();
  		}
  
  		fetcher.startFetch();
  	}
  });
  