/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*jshint evil: true, nomen: false, onevar: false, regexp: false, strict: true, boss: true, undef: true, maxlen: 160, curly: true, eqeqeq: true */
/*global document: false, jQuery:false, DOMParser: true, window: false, Wicket: true */

;(function (undefined) {

	'use strict';

	if (typeof(Wicket) === 'undefined' || typeof(Wicket.Ajax) === 'undefined') {
		throw 'Wicket.WebSocket needs wicket-ajax.js as prerequisite.';
	}

	jQuery.extend(Wicket.Event.Topic, {
		WebSocket: {
			Opened:       '/websocket/open',
			Message:      '/websocket/message',
			Closed:       '/websocket/closed',
			Error:        '/websocket/error',
			NotSupported: '/websocket/notsupported'
		}
	});

	Wicket.WebSocket = Wicket.Class.create();

	Wicket.WebSocket.MESSAGE_CHANNEL = 'websocketMessage|s';

	Wicket.WebSocket.prototype = {

		ws: null,

		initialize: function () {
			var topics = Wicket.Event.Topic.WebSocket;

			if (('WebSocket' in window)) {

				var self = this,
					url,
					protocol,
					WWS = Wicket.WebSocket,
					port = WWS.port || document.location.port,
					securePort = WWS.securePort || document.location.port,
					_port;

				protocol = document.location.protocol
					.replace('https:', 'wss:')
					.replace('http:', 'ws:');

				if ('wss:' === protocol) {
					_port = securePort ? ':' + securePort : '';
				} else {
					_port = port ? ':' + port : '';
				}
				url = protocol + '//' + document.location.hostname + _port + WWS.contextPath + WWS.filterPrefix + '/wicket/websocket';

				if (WWS.sessionId !== '') {
					url += ';jsessionid=' + encodeURIComponent(WWS.sessionId);
				}

				if (WWS.pageId !== false) {
					url += '?pageId=' + encodeURIComponent(WWS.pageId);
				} else if (WWS.resourceName) {
					url += '?resourceName=' + encodeURIComponent(WWS.resourceName);
				}

				url += '&wicket-ajax-baseurl=' + encodeURIComponent(WWS.baseUrl);
				url += '&wicket-app-name=' + encodeURIComponent(WWS.appName);

				self.ws = new WebSocket(url);

				self.ws.onopen = function (evt) {
					Wicket.Event.publish(topics.Opened, evt);
				};

				self.ws.onmessage = function (event) {

					var message = event.data;
					if (typeof(message) === 'string' && message.indexOf('<ajax-response>') > -1) {
						Wicket.channelManager.schedule(Wicket.WebSocket.MESSAGE_CHANNEL, Wicket.bind(function () {
							var context = {
								attrs: {},
								steps: []
							};
							var xmlDocument = Wicket.Xml.parse(message);
							this.loadedCallback(xmlDocument, context);
							context.steps.push(function () {
								Wicket.channelManager.done(Wicket.WebSocket.MESSAGE_CHANNEL);
								return Wicket.ChannelManager.FunctionsExecuter.DONE;
							});
							var executer = new Wicket.ChannelManager.FunctionsExecuter(context.steps);
							executer.start();
						}, new Wicket.Ajax.Call()));
					} else {
						Wicket.Event.publish(topics.Message, message);
					}
				};

				self.ws.onclose = function (evt) {
					if (self.ws) {
						self.ws.close();
						self.ws = null;
						Wicket.Event.publish(topics.Closed, evt);
					}
				};

				self.ws.onerror = function (evt) {
					if (self.ws) {
						self.ws.close();
						self.ws = null;
						Wicket.Event.publish(topics.Error, evt);
					}
				};
			} else {
				var errMessage = '[WebSocket.initialize] WebSocket is not supported in your browser!';
				Wicket.Log.error(errMessage);
				Wicket.Event.publish(topics.NotSupported, errMessage);
			}
		},

		send: function (text) {
			if (this.ws && text) {
				Wicket.Log.info('[WebSocket.send] Sending: ' + text);
				this.ws.send(text);
			} else if (!text) {
				Wicket.Log.error('[WebSocket.send] Cannot send an empty text message!');
			} else {
				Wicket.Log.error('[WebSocket.send] No open WebSocket connection! Cannot send text message: ' + text);
			}
		},

		close: function () {
			if (this.ws) {
				this.ws.close();
				Wicket.Log.info('[WebSocket.close] Connection closed.');
			} else {
				Wicket.Log.info('[WebSocket.close] Connection already closed.');
			}
		}
	};

	Wicket.WebSocket.createDefaultConnection = function () {
		if (!Wicket.WebSocket.INSTANCE) {
			Wicket.WebSocket.INSTANCE = new Wicket.WebSocket();
		}
	};

	Wicket.WebSocket.send = function (text) {
		if (Wicket.WebSocket.INSTANCE) {
			Wicket.WebSocket.INSTANCE.send(text);
		} else {
			Wicket.Log.error('[WebSocket.send] No default connection available!');
		}
	};

	Wicket.WebSocket.close = function () {
		if (Wicket.WebSocket.INSTANCE) {
			Wicket.WebSocket.INSTANCE.close();
			delete Wicket.WebSocket.INSTANCE;
		} else {
			Wicket.Log.info('[WebSocket.close] No default connection to close.');
		}
	};

})();
