// Copyright: Hiroshi Ichikawa <http://gimite.net/en/>
  // License: New BSD License
  // Reference: http://dev.w3.org/html5/websockets/
  // Reference: http://tools.ietf.org/html/rfc6455
  
  (function() {
    
    if (window.WEB_SOCKET_FORCE_FLASH) {
      // Keeps going.
    } else if (window.WebSocket) {
      return;
    } else if (window.MozWebSocket) {
      // Firefox.
      window.WebSocket = MozWebSocket;
      return;
    }
    
    var logger;
    if (window.WEB_SOCKET_LOGGER) {
      logger = WEB_SOCKET_LOGGER;
    } else if (window.console && window.console.log && window.console.error) {
      // In some environment, console is defined but console.log or console.error is missing.
      logger = window.console;
    } else {
      logger = {log: function(){ }, error: function(){ }};
    }
    
    // swfobject.hasFlashPlayerVersion("10.0.0") doesn't work with Gnash.
    if (swfobject.getFlashPlayerVersion().major < 10) {
      logger.error("Flash Player >= 10.0.0 is required.");
      return;
    }
    if (location.protocol == "file:") {
      logger.error(
        "WARNING: web-socket-js doesn't work in file:///... URL " +
        "unless you set Flash Security Settings properly. " +
        "Open the page via Web server i.e. http://...");
    }
  
    /**
     * Our own implementation of WebSocket class using Flash.
     * @param {string} url
     * @param {array or string} protocols
     * @param {string} proxyHost
     * @param {int} proxyPort
     * @param {string} headers
     */
    window.WebSocket = function(url, protocols, proxyHost, proxyPort, headers) {
      var self = this;
      self.__id = WebSocket.__nextId++;
      WebSocket.__instances[self.__id] = self;
      self.readyState = WebSocket.CONNECTING;
      self.bufferedAmount = 0;
      self.__events = {};
      if (!protocols) {
        protocols = [];
      } else if (typeof protocols == "string") {
        protocols = [protocols];
      }
      // Uses setTimeout() to make sure __createFlash() runs after the caller sets ws.onopen etc.
      // Otherwise, when onopen fires immediately, onopen is called before it is set.
      self.__createTask = setTimeout(function() {
        WebSocket.__addTask(function() {
          self.__createTask = null;
          WebSocket.__flash.create(
              self.__id, url, protocols, proxyHost || null, proxyPort || 0, headers || null);
        });
      }, 0);
    };
  
    /**
     * Send data to the web socket.
     * @param {string} data  The data to send to the socket.
     * @return {boolean}  True for success, false for failure.
     */
    WebSocket.prototype.send = function(data) {
      if (this.readyState == WebSocket.CONNECTING) {
        throw "INVALID_STATE_ERR: Web Socket connection has not been established";
      }
      // We use encodeURIComponent() here, because FABridge doesn't work if
      // the argument includes some characters. We don't use escape() here
      // because of this:
      // https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Functions#escape_and_unescape_Functions
      // But it looks decodeURIComponent(encodeURIComponent(s)) doesn't
      // preserve all Unicode characters either e.g. "\uffff" in Firefox.
      // Note by wtritch: Hopefully this will not be necessary using ExternalInterface.  Will require
      // additional testing.
      var result = WebSocket.__flash.send(this.__id, encodeURIComponent(data));
      if (result < 0) { // success
        return true;
      } else {
        this.bufferedAmount += result;
        return false;
      }
    };
  
    /**
     * Close this web socket gracefully.
     */
    WebSocket.prototype.close = function() {
      if (this.__createTask) {
        clearTimeout(this.__createTask);
        this.__createTask = null;
        this.readyState = WebSocket.CLOSED;
        return;
      }
      if (this.readyState == WebSocket.CLOSED || this.readyState == WebSocket.CLOSING) {
        return;
      }
      this.readyState = WebSocket.CLOSING;
      WebSocket.__flash.close(this.__id);
    };
  
    /**
     * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
     *
     * @param {string} type
     * @param {function} listener
     * @param {boolean} useCapture
     * @return void
     */
    WebSocket.prototype.addEventListener = function(type, listener, useCapture) {
      if (!(type in this.__events)) {
        this.__events[type] = [];
      }
      this.__events[type].push(listener);
    };
  
    /**
     * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
     *
     * @param {string} type
     * @param {function} listener
     * @param {boolean} useCapture
     * @return void
     */
    WebSocket.prototype.removeEventListener = function(type, listener, useCapture) {
      if (!(type in this.__events)) return;
      var events = this.__events[type];
      for (var i = events.length - 1; i >= 0; --i) {
        if (events[i] === listener) {
          events.splice(i, 1);
          break;
        }
      }
    };
  
    /**
     * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
     *
     * @param {Event} event
     * @return void
     */
    WebSocket.prototype.dispatchEvent = function(event) {
      var events = this.__events[event.type] || [];
      for (var i = 0; i < events.length; ++i) {
        events[i](event);
      }
      var handler = this["on" + event.type];
      if (handler) handler.apply(this, [event]);
    };
  
    /**
     * Handles an event from Flash.
     * @param {Object} flashEvent
     */
    WebSocket.prototype.__handleEvent = function(flashEvent) {
      
      if ("readyState" in flashEvent) {
        this.readyState = flashEvent.readyState;
      }
      if ("protocol" in flashEvent) {
        this.protocol = flashEvent.protocol;
      }
      
      var jsEvent;
      if (flashEvent.type == "open" || flashEvent.type == "error") {
        jsEvent = this.__createSimpleEvent(flashEvent.type);
      } else if (flashEvent.type == "close") {
        jsEvent = this.__createSimpleEvent("close");
        jsEvent.wasClean = flashEvent.wasClean ? true : false;
        jsEvent.code = flashEvent.code;
        jsEvent.reason = flashEvent.reason;
      } else if (flashEvent.type == "message") {
        var data = decodeURIComponent(flashEvent.message);
        jsEvent = this.__createMessageEvent("message", data);
      } else {
        throw "unknown event type: " + flashEvent.type;
      }
      
      this.dispatchEvent(jsEvent);
      
    };
    
    WebSocket.prototype.__createSimpleEvent = function(type) {
      if (document.createEvent && window.Event) {
        var event = document.createEvent("Event");
        event.initEvent(type, false, false);
        return event;
      } else {
        return {type: type, bubbles: false, cancelable: false};
      }
    };
    
    WebSocket.prototype.__createMessageEvent = function(type, data) {
      if (document.createEvent && window.MessageEvent && !window.opera) {
        var event = document.createEvent("MessageEvent");
        event.initMessageEvent("message", false, false, data, null, null, window, null);
        return event;
      } else {
        // IE and Opera, the latter one truncates the data parameter after any 0x00 bytes.
        return {type: type, data: data, bubbles: false, cancelable: false};
      }
    };
    
    /**
     * Define the WebSocket readyState enumeration.
     */
    WebSocket.CONNECTING = 0;
    WebSocket.OPEN = 1;
    WebSocket.CLOSING = 2;
    WebSocket.CLOSED = 3;
  
    // Field to check implementation of WebSocket.
    WebSocket.__isFlashImplementation = true;
    WebSocket.__initialized = false;
    WebSocket.__flash = null;
    WebSocket.__instances = {};
    WebSocket.__tasks = [];
    WebSocket.__nextId = 0;
    
    /**
     * Load a new flash security policy file.
     * @param {string} url
     */
    WebSocket.loadFlashPolicyFile = function(url){
      WebSocket.__addTask(function() {
        WebSocket.__flash.loadManualPolicyFile(url);
      });
    };
  
    /**
     * Loads WebSocketMain.swf and creates WebSocketMain object in Flash.
     */
    WebSocket.__initialize = function() {
      
      if (WebSocket.__initialized) return;
      WebSocket.__initialized = true;
      
      if (WebSocket.__swfLocation) {
        // For backword compatibility.
        window.WEB_SOCKET_SWF_LOCATION = WebSocket.__swfLocation;
      }
      if (!window.WEB_SOCKET_SWF_LOCATION) {
        logger.error("[WebSocket] set WEB_SOCKET_SWF_LOCATION to location of WebSocketMain.swf");
        return;
      }
      if (!window.WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR &&
          !WEB_SOCKET_SWF_LOCATION.match(/(^|\/)WebSocketMainInsecure\.swf(\?.*)?$/) &&
          WEB_SOCKET_SWF_LOCATION.match(/^\w+:\/\/([^\/]+)/)) {
        var swfHost = RegExp.$1;
        if (location.host != swfHost) {
          logger.error(
              "[WebSocket] You must host HTML and WebSocketMain.swf in the same host " +
              "('" + location.host + "' != '" + swfHost + "'). " +
              "See also 'How to host HTML file and SWF file in different domains' section " +
              "in README.md. If you use WebSocketMainInsecure.swf, you can suppress this message " +
              "by WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR = true;");
        }
      }
      var container = document.createElement("div");
      container.id = "webSocketContainer";
      // Hides Flash box. We cannot use display: none or visibility: hidden because it prevents
      // Flash from loading at least in IE. So we move it out of the screen at (-100, -100).
      // But this even doesn't work with Flash Lite (e.g. in Droid Incredible). So with Flash
      // Lite, we put it at (0, 0). This shows 1x1 box visible at left-top corner but this is
      // the best we can do as far as we know now.
      container.style.position = "absolute";
      if (WebSocket.__isFlashLite()) {
        container.style.left = "0px";
        container.style.top = "0px";
      } else {
        container.style.left = "-100px";
        container.style.top = "-100px";
      }
      var holder = document.createElement("div");
      holder.id = "webSocketFlash";
      container.appendChild(holder);
      document.body.appendChild(container);
      // See this article for hasPriority:
      // http://help.adobe.com/en_US/as3/mobile/WS4bebcd66a74275c36cfb8137124318eebc6-7ffd.html
      swfobject.embedSWF(
        WEB_SOCKET_SWF_LOCATION,
        "webSocketFlash",
        "1" /* width */,
        "1" /* height */,
        "10.0.0" /* SWF version */,
        null,
        null,
        {hasPriority: true, swliveconnect : true, allowScriptAccess: "always"},
        null,
        function(e) {
          if (!e.success) {
            logger.error("[WebSocket] swfobject.embedSWF failed");
          }
        }
      );
      
    };
    
    /**
     * Called by Flash to notify JS that it's fully loaded and ready
     * for communication.
     */
    WebSocket.__onFlashInitialized = function() {
      // We need to set a timeout here to avoid round-trip calls
      // to flash during the initialization process.
      setTimeout(function() {
        WebSocket.__flash = document.getElementById("webSocketFlash");
        WebSocket.__flash.setCallerUrl(location.href);
        WebSocket.__flash.setDebug(!!window.WEB_SOCKET_DEBUG);
        for (var i = 0; i < WebSocket.__tasks.length; ++i) {
          WebSocket.__tasks[i]();
        }
        WebSocket.__tasks = [];
      }, 0);
    };
    
    /**
     * Called by Flash to notify WebSockets events are fired.
     */
    WebSocket.__onFlashEvent = function() {
      setTimeout(function() {
        try {
          // Gets events using receiveEvents() instead of getting it from event object
          // of Flash event. This is to make sure to keep message order.
          // It seems sometimes Flash events don't arrive in the same order as they are sent.
          var events = WebSocket.__flash.receiveEvents();
          for (var i = 0; i < events.length; ++i) {
            WebSocket.__instances[events[i].webSocketId].__handleEvent(events[i]);
          }
        } catch (e) {
          logger.error(e);
        }
      }, 0);
      return true;
    };
    
    // Called by Flash.
    WebSocket.__log = function(message) {
      logger.log(decodeURIComponent(message));
    };
    
    // Called by Flash.
    WebSocket.__error = function(message) {
      logger.error(decodeURIComponent(message));
    };
    
    WebSocket.__addTask = function(task) {
      if (WebSocket.__flash) {
        task();
      } else {
        WebSocket.__tasks.push(task);
      }
    };
    
    /**
     * Test if the browser is running flash lite.
     * @return {boolean} True if flash lite is running, false otherwise.
     */
    WebSocket.__isFlashLite = function() {
      if (!window.navigator || !window.navigator.mimeTypes) {
        return false;
      }
      var mimeType = window.navigator.mimeTypes["application/x-shockwave-flash"];
      if (!mimeType || !mimeType.enabledPlugin || !mimeType.enabledPlugin.filename) {
        return false;
      }
      return mimeType.enabledPlugin.filename.match(/flashlite/i) ? true : false;
    };
    
    if (!window.WEB_SOCKET_DISABLE_AUTO_INITIALIZATION) {
      // NOTE:
      //   This fires immediately if web_socket.js is dynamically loaded after
      //   the document is loaded.
      swfobject.addDomLoadEvent(function() {
        WebSocket.__initialize();
      });
    }
    
  })();