'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2015, 2017
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
/**
 * This class creates EventChannelRouter object by Channel type.
 *
 * SAME_PAGE channel is supported meaning that widgets on same page will be notified.
 */
define(['underscore', '../lib/@waca/core-client/js/core-client/ui/core/Class', '../app/EventChannelRouter'], function (_, Class, EventChannelRouter) {

	// private members
	var CHANNEL_TYPE = {
		SAME_PAGE: 1, //A channel is established with a single page
		Page2Page: 2, //For future, Channel is established between explicit two pages
		Widget2Widget: 3 //For future, Channel is established between explicit two widgets
	};

	// list event names that will go through channel
	var EVENT_NAMES = {
		SAME_PAGE: ['dw:filters'],
		Page2Page: [], //For future
		Widget2Widget: [] //For future
	};

	var EventChannelRouterHelper = null;
	EventChannelRouterHelper = Class.extend({

		//Channel type
		TYPE: CHANNEL_TYPE,
		widgetAndPageMap: null, //Id (string) map - pairs of widgetId and pageId.
		pageAndChannelRouterMap: null, //pageId and EventChannelRouter object map
		eventRouter: null,

		init: function init(options) {
			EventChannelRouterHelper.inherited('init', this, arguments);
			this.eventRouter = options.eventRouter;
			this.pageAndChannelRouterMap = {};
		},

		destroy: function destroy() {
			for (var containerPageId in this.pageAndChannelRouterMap) {
				if (this.pageAndChannelRouterMap.hasOwnProperty(containerPageId)) {
					delete this.pageAndChannelRouterMap[containerPageId];
				}
			}
			delete this.topLayoutModel;
			delete this.pageAndChannelRouterMap;
			delete this.eventRouter;
		},

		/**
   * Create SamePage type EventChannelRouter for given containerPageId and store in the map
   */
		createSamePageEventChannelRouter: function createSamePageEventChannelRouter(containerPageId) {
			var channelOptoins = {
				channelId: containerPageId,
				eventNames: EVENT_NAMES.SAME_PAGE,
				globalEventRouter: this.eventRouter,
				alias: _.unique('tabPageECR_')
			};

			var pageEventRouter = new EventChannelRouter(channelOptoins);
			this.pageAndChannelRouterMap[containerPageId] = pageEventRouter;

			return pageEventRouter;
		},

		/**
   * @returns eventChannelRouter for the given pageId. Create and save one if does not exist
   */
		getChannelRouter: function getChannelRouter(containerPageId) {
			if (this.pageAndChannelRouterMap[containerPageId]) {
				return this.pageAndChannelRouterMap[containerPageId];
			}
			return this.createSamePageEventChannelRouter(containerPageId);
		}
	});

	return EventChannelRouterHelper;
});
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