/*
 * Licensed Materials - Property of IBM
 *
 * IBM Cognos Products: SHARE
 *
 * (C) Copyright IBM Corp. 2015, 2019
 *
 * US Government Users Restricted Rights - Use, duplication or disclosure
 * restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define([
	'underscore',
	'bi/glass/core/Events',
	'jquery',
	'bi/sharecommon/utils/translator'
], function(_,Events, $, t) {

	var SERVER_URI = 'v1/reports/';
	var SERVICE_URL = 'v1/notifications';
	var DISPLAY_DEFAULT = 20;
	var OFFSET_DEFAULT = 0;
	var POLLING_INTERVAL = 60000; // 1 minute

	var NOTIFICATION_STATE_ENDPOINT = '/notification_state';

	var NotificationService = Events.extend({
		/**
		 * @classdesc Notification service class giving access to events related
		 *            to notifications
		 * @constructs
		 * @public
		 * @param {Object} options - set of initial properties
		 */
		init: function(options) {
			NotificationService.inherited('init', this, arguments);

			$.extend(true, this, options);

			this.unreadIds = [];

			// These are for the 'ajax-hijack polling'
			this.canRun = true;
			this.excludeUrlsRegEx = /login/;
		},

		/**
		 * Called by glass when service is registered
		 */
		initialize: function(glassContext) {
			this.glassContext = glassContext;
		},

		/**
		 * This function is used to know whether or not the ajax service can do
		 * a poll for new messages. If the (canRun) flag is true, set it to
		 * false, create a timer that will automatically set it to true again
		 * and return true. Otherwise (the flag is false) return false
		 *
		 * @returns boolean
		 */
		allowedToRun: function() {
			if (this.canRun) {
				this.canRun = false;
				this._resetCanRun();
				return true;
			}
			return false;
		},

		_resetCanRun: function() {
			setTimeout(function() {
				this.canRun = true;
			}.bind(this), POLLING_INTERVAL);
		},

		pollForNewNotifications: function(options) {
			if (typeof options !== 'undefined') {
				var noNotificationPoll = options.noNotificationPoll;
				var url = options.url;
				var foundRegEx = this.excludeUrlsRegEx.exec(url);
				if (foundRegEx === null && this.allowedToRun() && (typeof noNotificationPoll == 'undefined' || (typeof noNotificationPoll != 'undefined' && noNotificationPoll !== true))) {
					return this.getNewNotifications();
				}
			}
		},

		/**
		 * Get a list of unread notifications starting from the newest for a
		 * maximum amount
		 *
		 * @param maxFetch max number of notifications to get
		 * @returns promise
		 */
		getNewNotifications: function(maxFetch) {

			var max = maxFetch || DISPLAY_DEFAULT;
			var url = SERVICE_URL + '?unread-only=true&max=' + max + '&offset=0';

			return this.glassContext.getCoreSvc('.Ajax').ajax({
				type: 'GET',
				url: url,
				contentType: 'application/json; charset=utf-8',
				dataType: 'json',
				noNotificationPoll: true
			}).then(function(response) {
				var data = response.data;
				this._updateUnreadIds(data);
				this.trigger('notifications:new', data);
				return data;
			}.bind(this)).catch(function(err) {
				var error = {
					message: this.retrieveErrorMessage({
						result: err.error,
						defaultMessage: t.translate('error_get_notifications')
					})
				};
				throw error;
			}.bind(this));

		},

		/**
		 * Get a list of notifications starting from an offset amount for a
		 * maximum amount
		 *
		 * @param maxFetch The maximum number of notifications to be returned
		 * @param offsetFetch The offset number to have a new starting point
		 *        instead of at zero (0)
		 * @returns promise
		 */
		getNotifications: function(maxFetch, offsetFetch) {
			var max = maxFetch || DISPLAY_DEFAULT;
			var offset = offsetFetch || OFFSET_DEFAULT;
			var url = SERVICE_URL + '?max=' + max + '&offset=' + offset;

			return this.glassContext.getCoreSvc('.Ajax').ajax({
				type: 'GET',
				url: url,
				contentType: 'application/json; charset=utf-8',
				dataType: 'json',
				noNotificationPoll: true
			}).then(function(response) {
				var data = response.data;
				this._updateUnreadIds(data);
				this.trigger('notifications:received', data);
				return data;
			}.bind(this)).catch(function(err) {
				var error = {
					message: this.retrieveErrorMessage({ result: err, defaultMessage: t.translate('error_get_notifications') })
				};
				this.glassContext.appController.showErrorMessage(error.message, t.translate('error_label_share'));
				throw error;
			}.bind(this));
		},

		/**
		 * Mark a notification as read
		 *
		 * @param messageId The id of the message being marked as read
		 * @returns promise
		 */
		markRead: function(messageId) {
			var url = SERVICE_URL + '/' + messageId;

			return this.glassContext.getCoreSvc('.Ajax').ajax({
				type: 'PUT',
				url: url,
				contentType: 'application/json; charset=utf-8',
				dataType: 'json',
				noNotificationPoll: true
			}).then(function(response) {
				var data = response.data;
				this._updateUnreadIds([data]);
				this.trigger('notifications:read', data);
				return data;
			}.bind(this))
				.catch(function(err) {
					var error = {
						message: this.retrieveErrorMessage({ result: err, defaultMessage: t.translate('error_put_notification') })
					};
					this.glassContext.appController.showErrorMessage(error.message, t.translate('error_label_share'));
					throw error;
				}.bind(this));
		},

		/**
		 * Retrieves information for the specified notification
		 *
		 * @param messageId The id of the message
		 * @returns promise
		 */
		getSpecificNotification: function(messageId) {
			var url = SERVICE_URL + '/' + messageId;
			return this.glassContext.getCoreSvc('.Ajax').ajax({
				type: 'GET',
				url: url,
				contentType: 'application/json; charset=utf-8',
				dataType: 'json'
			}).then(function(response) {
				return response.data;
			}).catch(function(err) {
				var error = {
					message: this.retrieveErrorMessage({ result: err, defaultMessage: t.translate('error_get_notification') })
				};
				this.glassContext.appController.showErrorMessage(error.message, t.translate('error_label_share'));
				throw error;
			}.bind(this));
		},

		/**
		 * Deletes the specified notification
		 *
		 * @param context The id of the message to delete
		 * @returns promise
		 */
		deleteNotification: function(messageId) {
			var url = SERVICE_URL + '/' + messageId;
			return this.glassContext.getCoreSvc('.Ajax').ajax({
				type: 'DELETE',
				url: url,
				contentType: 'application/json; charset=utf-8',
				dataType: 'json',
				noNotificationPoll: true
			}).then(function(response) {
				var data = response.data;
				var deleted = {
					id: messageId,
					result: data
				};
				this._updateUnreadIds([deleted], true);
				this.trigger('notifications:deleted', deleted);
				return data;
			}.bind(this)).catch(function(err) {
				var error = {
					message: this.retrieveErrorMessage({ result: err, defaultMessage: t.translate('error_delete_notification') })
				};
				this.glassContext.appController.showErrorMessage(error.message, t.translate('error_label_share'));
				throw error;
			}.bind(this));
		},

		retrieveErrorMessage: function(input) {
			input = input || {};
			var message = input.defaultMessage;
			try {
				var text = $.parseJSON(input.result.responseText);
				message = text.error || text.message;
			} catch (e) { /*continue*/ }
			return message;
		},

		getNotificationState: function(reportId) {
			var server_URL = SERVER_URI + reportId + NOTIFICATION_STATE_ENDPOINT;

			return this.glassContext.getCoreSvc('.Ajax').ajax({
				type: 'GET',
				url: server_URL,
				contentType: 'application/json; charset=utf-8',
				dataType: 'json'
			}).then(function(response) {
				return response.data;
			}).catch(function(err) {
				var error = {
					message: this.retrieveErrorMessage({ result: err, defaultMessage: t.translate('error_get_report_notification_state') })
				};
				//NotificationService should not be presenting an error message.  It throws an error, which should be handled appropriately by a calling View component.
				//this.glassContext.appController.showErrorMessage(error.message, t.translate('error_label_share'));
				throw error;
			}.bind(this));
		},

		updateNotificationState: function(descriptor) {
			var server_URL = SERVER_URI + descriptor.reportId + NOTIFICATION_STATE_ENDPOINT;
			var jsonData = {
				'state': descriptor.state
			};

			return this.glassContext.getCoreSvc('.Ajax').ajax({
				url: server_URL,
				type: 'PUT',
				headers: {
					Accept: 'application/vnd.ibm.bi.notification-state+json',
					'Content-Type': 'application/vnd.ibm.bi.notification-state+json'
				},
				dataType: 'json',
				data: JSON.stringify(jsonData)
			}).then(function(response) {
				return response.data;
			}).catch(function(err) {
				var error = {
					message: this.retrieveErrorMessage({ result: err, defaultMessage: t.translate('error_update_report_notification_state') })
				};
				this.glassContext.appController.showErrorMessage(error.message, t.translate('error_label_share'));
				throw err;
			}.bind(this));
		},

		/**
				 * Function to update the unreadIds array and then trigger an update
				 * event to update the notification button badge
				 *
				 * @param data an array of data objects to use to update the array of
				 *        unreadIds
				 * @param remove flag to force the removal of an id in the unreadIds
				 *        array
				 */
		_updateUnreadIds: function(data, remove) {
			if (Array.isArray(data)) {
				var dataLength = data.length;
				var forceRemove = remove || false;
				for (var i = 0; i < dataLength; i++) {
					if (forceRemove || (!data[i].unread && _.contains(this.unreadIds, data[i].id))) {
						this._removeUnreadId(data[i].id);
					} else if (data[i].unread && !_.contains(this.unreadIds, data[i].id)) {
						this.unreadIds.push(data[i].id);
					}
				}

				this.trigger('notifications:newCount', this.unreadIds.length);
			}
		},

		_removeUnreadId: function(messageId) {
			var index = this.unreadIds.indexOf(messageId);
			if (index >= 0) {
				this.unreadIds.splice(index, 1);
			}
		}

	});

	return NotificationService;
});