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+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is Mozilla.
+ * Portions created by the Initial Developer are Copyright (C) 2007
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Atul Varma <atul@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+"use strict";
+
+const {Cc,Ci} = require("chrome");
+
+var errors = require("./errors");
+
+var gWindowWatcher = Cc["@mozilla.org/embedcomp/window-watcher;1"]
+                     .getService(Ci.nsIWindowWatcher);
+
+const { EventEmitter } = require('./events'),
+      { Trait } = require('./traits');
+
+/**
+ * An iterator for XUL windows currently in the application.
+ * 
+ * @return A generator that yields XUL windows exposing the
+ *         nsIDOMWindow interface.
+ */
+var windowIterator = exports.windowIterator = function windowIterator() {
+  let winEnum = gWindowWatcher.getWindowEnumerator();
+  while (winEnum.hasMoreElements())
+    yield winEnum.getNext().QueryInterface(Ci.nsIDOMWindow);
+};
+
+/**
+ * An iterator for browser windows currently open in the application.
+ * @returns {Function}
+ *    A generator that yields browser windows exposing the `nsIDOMWindow`
+ *    interface.
+ */
+function browserWindowIterator() {
+  for each (let window in windowIterator()) {
+    if (isBrowser(window))
+      yield window;
+  }
+}
+exports.browserWindowIterator = browserWindowIterator;
+
+var WindowTracker = exports.WindowTracker = function WindowTracker(delegate) {
+  this.delegate = delegate;
+  this._loadingWindows = [];
+  for (let window in windowIterator())
+    this._regWindow(window);
+  gWindowWatcher.registerNotification(this);
+  require("./unload").ensure(this);
+};
+
+WindowTracker.prototype = {
+  _regLoadingWindow: function _regLoadingWindow(window) {
+    this._loadingWindows.push(window);
+    window.addEventListener("load", this, true);
+  },
+
+  _unregLoadingWindow: function _unregLoadingWindow(window) {
+    var index = this._loadingWindows.indexOf(window);
+
+    if (index != -1) {
+      this._loadingWindows.splice(index, 1);
+      window.removeEventListener("load", this, true);
+    }
+  },
+
+  _regWindow: function _regWindow(window) {
+    if (window.document.readyState == "complete") {
+      this._unregLoadingWindow(window);
+      this.delegate.onTrack(window);
+    } else
+      this._regLoadingWindow(window);
+  },
+
+  _unregWindow: function _unregWindow(window) {
+    if (window.document.readyState == "complete") {
+      if (this.delegate.onUntrack)
+        this.delegate.onUntrack(window);
+    } else {
+      this._unregLoadingWindow(window);
+    }
+  },
+
+  unload: function unload() {
+    gWindowWatcher.unregisterNotification(this);
+    for (let window in windowIterator())
+      this._unregWindow(window);
+  },
+
+  handleEvent: function handleEvent(event) {
+    if (event.type == "load" && event.target) {
+      var window = event.target.defaultView;
+      if (window)
+        this._regWindow(window);
+    }
+  },
+
+  observe: function observe(subject, topic, data) {
+    var window = subject.QueryInterface(Ci.nsIDOMWindow);
+    if (topic == "domwindowopened")
+      this._regWindow(window);
+    else
+      this._unregWindow(window);
+  }
+};
+
+errors.catchAndLogProps(WindowTracker.prototype, ["handleEvent", "observe"]);
+
+const WindowTrackerTrait = Trait.compose({
+  _onTrack: Trait.required,
+  _onUntrack: Trait.required,
+  constructor: function WindowTrackerTrait() {
+    new WindowTracker({
+      onTrack: this._onTrack.bind(this),
+      onUntrack: this._onUntrack.bind(this)
+    });
+  }
+});
+exports.WindowTrackerTrait = WindowTrackerTrait;
+
+var gDocsToClose = [];
+
+function onDocUnload(event) {
+  var index = gDocsToClose.indexOf(event.target);
+  if (index == -1)
+    throw new Error("internal error: unloading document not found");
+  var document = gDocsToClose.splice(index, 1)[0];
+  // Just in case, let's remove the event listener too.
+  document.defaultView.removeEventListener("unload", onDocUnload, false);
+}
+
+onDocUnload = require("./errors").catchAndLog(onDocUnload);
+
+exports.closeOnUnload = function closeOnUnload(window) {
+  window.addEventListener("unload", onDocUnload, false);
+  gDocsToClose.push(window.document);
+};
+
+exports.__defineGetter__("activeWindow", function() {
+  return Cc["@mozilla.org/appshell/window-mediator;1"]
+         .getService(Ci.nsIWindowMediator)
+         .getMostRecentWindow(null);
+});
+exports.__defineSetter__("activeWindow", function(window) {
+  try {
+    window.focus();
+  }
+  catch (e) { }
+});
+
+exports.__defineGetter__("activeBrowserWindow", function() {
+  return Cc["@mozilla.org/appshell/window-mediator;1"]
+         .getService(Ci.nsIWindowMediator)
+         .getMostRecentWindow("navigator:browser");
+});
+
+/**
+ * Returns the ID of the window's current inner window.
+ */
+exports.getInnerId = function getInnerId(window) {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor).
+                getInterface(Ci.nsIDOMWindowUtils).currentInnerWindowID;
+};
+
+/**
+ * Returns the ID of the window's outer window.
+ */
+exports.getOuterId = function getOuterId(window) {
+  return window.QueryInterface(Ci.nsIInterfaceRequestor).
+                getInterface(Ci.nsIDOMWindowUtils).outerWindowID;
+};
+
+function isBrowser(window) {
+  return window.document.documentElement.getAttribute("windowtype") ===
+         "navigator:browser";
+};
+exports.isBrowser = isBrowser;
+
+require("./unload").when(
+  function() {
+    gDocsToClose.slice().forEach(
+      function(doc) { doc.defaultView.close(); });
+  });