/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

Cu.import('resource://gre/modules/ContactService.jsm');
Cu.import('resource://gre/modules/SettingsChangeNotifier.jsm');
Cu.import('resource://gre/modules/DataStoreChangeNotifier.jsm');
Cu.import('resource://gre/modules/AlarmService.jsm');
Cu.import('resource://gre/modules/ActivitiesService.jsm');
Cu.import('resource://gre/modules/PermissionPromptHelper.jsm');
Cu.import('resource://gre/modules/NotificationDB.jsm');
Cu.import('resource://gre/modules/Payment.jsm');
Cu.import("resource://gre/modules/AppsUtils.jsm");
Cu.import('resource://gre/modules/UserAgentOverrides.jsm');
Cu.import('resource://gre/modules/Keyboard.jsm');
Cu.import('resource://gre/modules/ErrorPage.jsm');
#ifdef MOZ_WIDGET_GONK
Cu.import('resource://gre/modules/NetworkStatsService.jsm');
#endif

// Identity
Cu.import('resource://gre/modules/SignInToWebsite.jsm');
SignInToWebsiteController.init();
Cu.import('resource://gre/modules/FxAccountsMgmtService.jsm');

Cu.import('resource://gre/modules/DownloadsAPI.jsm');

Cu.import('resource://gre/modules/Webapps.jsm');
DOMApplicationRegistry.allAppsLaunchable = true;

XPCOMUtils.defineLazyServiceGetter(Services, 'env',
                                   '@mozilla.org/process/environment;1',
                                   'nsIEnvironment');

XPCOMUtils.defineLazyServiceGetter(Services, 'ss',
                                   '@mozilla.org/content/style-sheet-service;1',
                                   'nsIStyleSheetService');

XPCOMUtils.defineLazyServiceGetter(this, 'gSystemMessenger',
                                   '@mozilla.org/system-message-internal;1',
                                   'nsISystemMessagesInternal');

XPCOMUtils.defineLazyServiceGetter(Services, 'fm',
                                   '@mozilla.org/focus-manager;1',
                                   'nsIFocusManager');

XPCOMUtils.defineLazyGetter(this, 'DebuggerServer', function() {
  Cu.import('resource://gre/modules/devtools/dbg-server.jsm');
  return DebuggerServer;
});

XPCOMUtils.defineLazyGetter(this, "ppmm", function() {
  return Cc["@mozilla.org/parentprocessmessagemanager;1"]
         .getService(Ci.nsIMessageListenerManager);
});

#ifdef MOZ_WIDGET_GONK
XPCOMUtils.defineLazyGetter(this, "libcutils", function () {
  Cu.import("resource://gre/modules/systemlibs.js");
  return libcutils;
});
#endif

#ifdef MOZ_CAPTIVEDETECT
XPCOMUtils.defineLazyServiceGetter(Services, 'captivePortalDetector',
                                  '@mozilla.org/toolkit/captive-detector;1',
                                  'nsICaptivePortalDetector');
#endif

function getContentWindow() {
  return shell.contentBrowser.contentWindow;
}

function debug(str) {
  dump(' -*- Shell.js: ' + str + '\n');
}

#ifdef MOZ_CRASHREPORTER
function debugCrashReport(aStr) {
  dump('Crash reporter : ' + aStr);
}
#else
function debugCrashReport(aStr) {}
#endif

var shell = {

  get CrashSubmit() {
    delete this.CrashSubmit;
#ifdef MOZ_CRASHREPORTER
    Cu.import("resource://gre/modules/CrashSubmit.jsm", this);
    return this.CrashSubmit;
#else
    dump('Crash reporter : disabled at build time.');
    return this.CrashSubmit = null;
#endif
  },

  onlineForCrashReport: function shell_onlineForCrashReport() {
    let wifiManager = navigator.mozWifiManager;
    let onWifi = (wifiManager &&
                  (wifiManager.connection.status == 'connected'));
    return !Services.io.offline && onWifi;
  },

  reportCrash: function shell_reportCrash(isChrome, aCrashID) {
    let crashID = aCrashID;
    try {
      // For chrome crashes, we want to report the lastRunCrashID.
      if (isChrome) {
        crashID = Cc["@mozilla.org/xre/app-info;1"]
                    .getService(Ci.nsIXULRuntime).lastRunCrashID;
      }
    } catch(e) {
      debugCrashReport('Failed to fetch crash id. Crash ID is "' + crashID
                       + '" Exception: ' + e);
    }

    // Bail if there isn't a valid crashID.
    if (!this.CrashSubmit || !crashID && !this.CrashSubmit.pendingIDs().length) {
      return;
    }

    // purge the queue.
    this.CrashSubmit.pruneSavedDumps();

    try {
      // Check if we should automatically submit this crash.
      if (Services.prefs.getBoolPref('app.reportCrashes')) {
        this.submitCrash(crashID);
      } else {
        this.deleteCrash(crashID);
      }
    } catch (e) {
      debugCrashReport('Can\'t fetch app.reportCrashes. Exception: ' + e);
    }

    // We can get here if we're just submitting old pending crashes.
    // Check that there's a valid crashID so that we only notify the
    // user if a crash just happened and not when we OOM. Bug 829477
    if (crashID) {
      this.sendChromeEvent({
        type: "handle-crash",
        crashID: crashID,
        chrome: isChrome
      });
    }
  },

  deleteCrash: function shell_deleteCrash(aCrashID) {
    if (aCrashID) {
      debugCrashReport('Deleting pending crash: ' + aCrashID);
      shell.CrashSubmit.delete(aCrashID);
    }
  },

  // this function submit the pending crashes.
  // make sure you are online.
  submitQueuedCrashes: function shell_submitQueuedCrashes() {
    // submit the pending queue.
    let pending = shell.CrashSubmit.pendingIDs();
    for (let crashid of pending) {
      debugCrashReport('Submitting crash: ' + crashid);
      shell.CrashSubmit.submit(crashid);
    }
  },

  // This function submits a crash when we're online.
  submitCrash: function shell_submitCrash(aCrashID) {
    if (this.onlineForCrashReport()) {
      this.submitQueuedCrashes();
      return;
    }

    debugCrashReport('Not online, postponing.');

    Services.obs.addObserver(function observer(subject, topic, state) {
      let network = subject.QueryInterface(Ci.nsINetworkInterface);
      if (network.state == Ci.nsINetworkInterface.NETWORK_STATE_CONNECTED
          && network.type == Ci.nsINetworkInterface.NETWORK_TYPE_WIFI) {
        shell.submitQueuedCrashes();

        Services.obs.removeObserver(observer, topic);
      }
    }, "network-interface-state-changed", false);
  },

  get contentBrowser() {
    delete this.contentBrowser;
    return this.contentBrowser = document.getElementById('systemapp');
  },

  get homeURL() {
    try {
      let homeSrc = Services.env.get('B2G_HOMESCREEN');
      if (homeSrc)
        return homeSrc;
    } catch (e) {}

    return Services.prefs.getCharPref('browser.homescreenURL');
  },

  get manifestURL() {
    return Services.prefs.getCharPref('browser.manifestURL');
  },

  _started: false,
  hasStarted: function shell_hasStarted() {
    return this._started;
  },

  start: function shell_start() {
    this._started = true;

    // This forces the initialization of the cookie service before we hit the
    // network.
    // See bug 810209
    let cookies = Cc["@mozilla.org/cookieService;1"];

    try {
      let cr = Cc["@mozilla.org/xre/app-info;1"]
                 .getService(Ci.nsICrashReporter);
      // Dogfood id. We might want to remove it in the future.
      // see bug 789466
      try {
        let dogfoodId = Services.prefs.getCharPref('prerelease.dogfood.id');
        if (dogfoodId != "") {
          cr.annotateCrashReport("Email", dogfoodId);
        }
      }
      catch (e) { }

#ifdef MOZ_WIDGET_GONK
      // Annotate crash report
      let annotations = [ [ "Android_Hardware",     "ro.hardware" ],
                          [ "Android_Device",       "ro.product.device" ],
                          [ "Android_CPU_ABI2",     "ro.product.cpu.abi2" ],
                          [ "Android_CPU_ABI",      "ro.product.cpu.abi" ],
                          [ "Android_Manufacturer", "ro.product.manufacturer" ],
                          [ "Android_Brand",        "ro.product.brand" ],
                          [ "Android_Model",        "ro.product.model" ],
                          [ "Android_Board",        "ro.product.board" ],
        ];

      annotations.forEach(function (element) {
          cr.annotateCrashReport(element[0], libcutils.property_get(element[1]));
        });

      let androidVersion = libcutils.property_get("ro.build.version.sdk") +
                           "(" + libcutils.property_get("ro.build.version.codename") + ")";
      cr.annotateCrashReport("Android_Version", androidVersion);

      SettingsListener.observe("deviceinfo.os", "", function(value) {
        try {
          let cr = Cc["@mozilla.org/xre/app-info;1"]
                     .getService(Ci.nsICrashReporter);
          cr.annotateCrashReport("B2G_OS_Version", value);
        } catch(e) { }
      });
#endif
    } catch(e) {
      debugCrashReport('exception: ' + e);
    }

    let homeURL = this.homeURL;
    if (!homeURL) {
      let msg = 'Fatal error during startup: No homescreen found: try setting B2G_HOMESCREEN';
      alert(msg);
      return;
    }
    let manifestURL = this.manifestURL;
    // <html:iframe id="systemapp"
    //              mozbrowser="true" allowfullscreen="true"
    //              style="overflow: hidden; height: 100%; width: 100%; border: none;"
    //              src="data:text/html;charset=utf-8,%3C!DOCTYPE html>%3Cbody style='background:black;'>"/>
    let systemAppFrame =
      document.createElementNS('http://www.w3.org/1999/xhtml', 'html:iframe');
    systemAppFrame.setAttribute('id', 'systemapp');
    systemAppFrame.setAttribute('mozbrowser', 'true');
    systemAppFrame.setAttribute('mozapp', manifestURL);
    systemAppFrame.setAttribute('allowfullscreen', 'true');
    systemAppFrame.setAttribute('style', "overflow: hidden; height: 100%; width: 100%; border: none;");
    systemAppFrame.setAttribute('src', "data:text/html;charset=utf-8,%3C!DOCTYPE html>%3Cbody style='background:black;");
    let container = document.getElementById('container');
#ifdef MOZ_WIDGET_COCOA
    container.removeChild(document.getElementById('placeholder'));
#endif
    container.appendChild(systemAppFrame);

    systemAppFrame.contentWindow
                  .QueryInterface(Ci.nsIInterfaceRequestor)
                  .getInterface(Ci.nsIWebNavigation)
                  .sessionHistory = Cc["@mozilla.org/browser/shistory;1"]
                                      .createInstance(Ci.nsISHistory);

    // On firefox mulet, shell.html is loaded in a tab
    // and we have to listen on the chrome event handler
    // to catch key events
    let chromeEventHandler = window.QueryInterface(Ci.nsIInterfaceRequestor)
                                   .getInterface(Ci.nsIWebNavigation)
                                   .QueryInterface(Ci.nsIDocShell)
                                   .chromeEventHandler || window;
    // Capture all key events so we can filter out hardware buttons
    // And send them to Gaia via mozChromeEvents.
    // Ideally, hardware buttons wouldn't generate key events at all, or
    // if they did, they would use keycodes that conform to DOM 3 Events.
    // See discussion in https://bugzilla.mozilla.org/show_bug.cgi?id=762362
    chromeEventHandler.addEventListener('keydown', this, true);
    chromeEventHandler.addEventListener('keypress', this, true);
    chromeEventHandler.addEventListener('keyup', this, true);

    window.addEventListener('MozApplicationManifest', this);
    window.addEventListener('mozfullscreenchange', this);
    window.addEventListener('MozAfterPaint', this);
    window.addEventListener('sizemodechange', this);
    window.addEventListener('unload', this);
    this.contentBrowser.addEventListener('mozbrowserloadstart', this, true);

    CustomEventManager.init();
    WebappsHelper.init();
    UserAgentOverrides.init();
    IndexedDBPromptHelper.init();
    CaptivePortalLoginHelper.init();

    this.contentBrowser.src = homeURL;
    this.isHomeLoaded = false;

    ppmm.addMessageListener("content-handler", this);
    ppmm.addMessageListener("dial-handler", this);
    ppmm.addMessageListener("sms-handler", this);
    ppmm.addMessageListener("mail-handler", this);
    ppmm.addMessageListener("app-notification-send", AlertsHelper);
    ppmm.addMessageListener("file-picker", this);
    ppmm.addMessageListener("getProfD", function(message) {
      return Services.dirsvc.get("ProfD", Ci.nsIFile).path;
    });
  },

  stop: function shell_stop() {
    window.removeEventListener('unload', this);
    window.removeEventListener('keydown', this, true);
    window.removeEventListener('keypress', this, true);
    window.removeEventListener('keyup', this, true);
    window.removeEventListener('MozApplicationManifest', this);
    window.removeEventListener('mozfullscreenchange', this);
    window.removeEventListener('sizemodechange', this);
    this.contentBrowser.removeEventListener('mozbrowserloadstart', this, true);
    ppmm.removeMessageListener("content-handler", this);
    if (this.timer) {
      this.timer.cancel();
      this.timer = null;
    }

    UserAgentOverrides.uninit();
    IndexedDBPromptHelper.uninit();
  },

  // If this key event actually represents a hardware button, filter it here
  // and send a mozChromeEvent with detail.type set to xxx-button-press or
  // xxx-button-release instead.
  filterHardwareKeys: function shell_filterHardwareKeys(evt) {
    var type;
    switch (evt.keyCode) {
      case evt.DOM_VK_HOME:         // Home button
        type = 'home-button';
        break;
      case evt.DOM_VK_SLEEP:        // Sleep button
      case evt.DOM_VK_END:          // On desktop we don't have a sleep button
        type = 'sleep-button';
        break;
      case evt.DOM_VK_PAGE_UP:      // Volume up button
        type = 'volume-up-button';
        break;
      case evt.DOM_VK_PAGE_DOWN:    // Volume down button
        type = 'volume-down-button';
        break;
      case evt.DOM_VK_ESCAPE:       // Back button (should be disabled)
        type = 'back-button';
        break;
      case evt.DOM_VK_CONTEXT_MENU: // Menu button
        type = 'menu-button';
        break;
      case evt.DOM_VK_F1: // headset button
        type = 'headset-button';
        break;
    }

    let mediaKeys = {
      'MediaNextTrack': 'media-next-track-button',
      'MediaPreviousTrack': 'media-previous-track-button',
      'MediaPause': 'media-pause-button',
      'MediaPlay': 'media-play-button',
      'MediaPlayPause': 'media-play-pause-button',
      'MediaStop': 'media-stop-button',
      'MediaRewind': 'media-rewind-button',
      'FastFwd': 'media-fast-forward-button'
    };

    let isMediaKey = false;
    if (mediaKeys[evt.key]) {
      isMediaKey = true;
      type = mediaKeys[evt.key];
    }

    if (!type) {
      return;
    }

    // If we didn't return, then the key event represents a hardware key
    // and we need to prevent it from propagating to Gaia
    evt.stopImmediatePropagation();
    evt.preventDefault(); // Prevent keypress events (when #501496 is fixed).

    // If it is a key down or key up event, we send a chrome event to Gaia.
    // If it is a keypress event we just ignore it.
    switch (evt.type) {
      case 'keydown':
        type = type + '-press';
        break;
      case 'keyup':
        type = type + '-release';
        break;
      case 'keypress':
        return;
    }

    // Let applications receive the headset button key press/release event.
    if (evt.keyCode == evt.DOM_VK_F1 && type !== this.lastHardwareButtonEventType) {
      this.lastHardwareButtonEventType = type;
      gSystemMessenger.broadcastMessage('headset-button', type);
      return;
    }

    if (isMediaKey) {
      this.lastHardwareButtonEventType = type;
      gSystemMessenger.broadcastMessage('media-button', type);
      return;
    }

    // On my device, the physical hardware buttons (sleep and volume)
    // send multiple events (press press release release), but the
    // soft home button just sends one.  This hack is to manually
    // "debounce" the keys. If the type of this event is the same as
    // the type of the last one, then don't send it.  We'll never send
    // two presses or two releases in a row.
    // FIXME: https://bugzilla.mozilla.org/show_bug.cgi?id=761067
    if (type !== this.lastHardwareButtonEventType) {
      this.lastHardwareButtonEventType = type;
      this.sendChromeEvent({type: type});
    }
  },

  lastHardwareButtonEventType: null, // property for the hack above
  needBufferOpenAppReq: true,
  bufferedOpenAppReqs: [],
  timer: null,
  visibleNormalAudioActive: false,

  handleEvent: function shell_handleEvent(evt) {
    let content = this.contentBrowser.contentWindow;
    switch (evt.type) {
      case 'keydown':
      case 'keyup':
      case 'keypress':
        this.filterHardwareKeys(evt);
        break;
      case 'mozfullscreenchange':
        // When the screen goes fullscreen make sure to set the focus to the
        // main window so noboby can prevent the ESC key to get out fullscreen
        // mode
        if (document.mozFullScreen)
          Services.fm.focusedWindow = window;
        break;
      case 'sizemodechange':
        if (window.windowState == window.STATE_MINIMIZED && !this.visibleNormalAudioActive) {
          this.contentBrowser.setVisible(false);
        } else {
          this.contentBrowser.setVisible(true);
        }
        break;
      case 'mozbrowserloadstart':
        if (content.document.location == 'about:blank') {
          this.contentBrowser.addEventListener('mozbrowserlocationchange', this, true);
          return;
        }

        this.notifyContentStart();
        break;
      case 'mozbrowserlocationchange':
        if (content.document.location == 'about:blank') {
          return;
        }

        this.notifyContentStart();
       break;

      case 'MozApplicationManifest':
        try {
          if (!Services.prefs.getBoolPref('browser.cache.offline.enable'))
            return;

          let contentWindow = evt.originalTarget.defaultView;
          let documentElement = contentWindow.document.documentElement;
          if (!documentElement)
            return;

          let manifest = documentElement.getAttribute('manifest');
          if (!manifest)
            return;

          let principal = contentWindow.document.nodePrincipal;
          if (Services.perms.testPermissionFromPrincipal(principal, 'offline-app') == Ci.nsIPermissionManager.UNKNOWN_ACTION) {
            if (Services.prefs.getBoolPref('browser.offline-apps.notify')) {
              // FIXME Bug 710729 - Add a UI for offline cache notifications
              return;
            }
            return;
          }

          Services.perms.addFromPrincipal(principal, 'offline-app',
                                          Ci.nsIPermissionManager.ALLOW_ACTION);

          let documentURI = Services.io.newURI(contentWindow.document.documentURI,
                                               null,
                                               null);
          let manifestURI = Services.io.newURI(manifest, null, documentURI);
          let updateService = Cc['@mozilla.org/offlinecacheupdate-service;1']
                              .getService(Ci.nsIOfflineCacheUpdateService);
          updateService.scheduleUpdate(manifestURI, documentURI, window);
        } catch (e) {
          dump('Error while creating offline cache: ' + e + '\n');
        }
        break;
      case 'MozAfterPaint':
        window.removeEventListener('MozAfterPaint', this);
        this.sendChromeEvent({
          type: 'system-first-paint'
        });
        break;
      case 'unload':
        this.stop();
        break;
    }
  },

  sendEvent: function shell_sendEvent(content, type, details) {
    let event = content.document.createEvent('CustomEvent');
    event.initCustomEvent(type, true, true, details ? details : {});
    content.dispatchEvent(event);
  },

  sendCustomEvent: function shell_sendCustomEvent(type, details) {
    let content = getContentWindow();
    let event = content.document.createEvent('CustomEvent');
    let payload = details ? Cu.cloneInto(details, content) : {};
    event.initCustomEvent(type, true, true, payload);
    content.dispatchEvent(event);
  },

  sendChromeEvent: function shell_sendChromeEvent(details) {
    if (!this.isHomeLoaded) {
      if (!('pendingChromeEvents' in this)) {
        this.pendingChromeEvents = [];
      }

      this.pendingChromeEvents.push(details);
      return;
    }

    this.sendEvent(getContentWindow(), "mozChromeEvent",
                   Cu.cloneInto(details, getContentWindow()));
  },

  openAppForSystemMessage: function shell_openAppForSystemMessage(msg) {
    let origin = Services.io.newURI(msg.manifest, null, null).prePath;
    let payload = {
      url: msg.uri,
      manifestURL: msg.manifest,
      isActivity: (msg.type == 'activity'),
      onlyShowApp: msg.onlyShowApp,
      showApp: msg.showApp,
      target: msg.target,
      expectingSystemMessage: true,
      extra: msg.extra
    }
    this.sendCustomEvent('open-app', payload);
  },

  receiveMessage: function shell_receiveMessage(message) {
    var activities = { 'content-handler': { name: 'view', response: null },
                       'dial-handler':    { name: 'dial', response: null },
                       'mail-handler':    { name: 'new',  response: null },
                       'sms-handler':     { name: 'new',  response: null },
                       'file-picker':     { name: 'pick', response: 'file-picked' } };

    if (!(message.name in activities))
      return;

    let data = message.data;
    let activity = activities[message.name];

    let a = new MozActivity({
      name: activity.name,
      data: data
    });

    if (activity.response) {
      a.onsuccess = function() {
        let sender = message.target.QueryInterface(Ci.nsIMessageSender);
        sender.sendAsyncMessage(activity.response, { success: true,
                                                     result:  a.result });
      }
      a.onerror = function() {
        let sender = message.target.QueryInterface(Ci.nsIMessageSender);
        sender.sendAsyncMessage(activity.response, { success: false });
      }
    }
  },

  notifyContentStart: function shell_notifyContentStart() {
    this.contentBrowser.removeEventListener('mozbrowserloadstart', this, true);
    this.contentBrowser.removeEventListener('mozbrowserlocationchange', this, true);

    let content = this.contentBrowser.contentWindow;

    this.reportCrash(true);

    this.sendEvent(window, 'ContentStart');

    Services.obs.notifyObservers(null, 'content-start', null);

#ifdef MOZ_WIDGET_GONK
    Cu.import('resource://gre/modules/OperatorApps.jsm');
#endif

    content.addEventListener('load', function shell_homeLoaded() {
      content.removeEventListener('load', shell_homeLoaded);
      shell.isHomeLoaded = true;

#ifdef MOZ_WIDGET_GONK
      libcutils.property_set('sys.boot_completed', '1');
#endif

      Services.obs.notifyObservers(null, "browser-ui-startup-complete", "");

      if ('pendingChromeEvents' in shell) {
        shell.pendingChromeEvents.forEach((shell.sendChromeEvent).bind(shell));
      }
      delete shell.pendingChromeEvents;
    });
  }
};

// Listen for the request of opening app and relay them to Gaia.
Services.obs.addObserver(function onSystemMessageOpenApp(subject, topic, data) {
  let msg = JSON.parse(data);
  // Buffer non-activity request until content starts to load for 10 seconds.
  // We'll revisit this later if new kind of requests don't need to be cached.
  if (shell.needBufferOpenAppReq && msg.type !== 'activity') {
    shell.bufferedOpenAppReqs.push(msg);
    return;
  }
  shell.openAppForSystemMessage(msg);
}, 'system-messages-open-app', false);

Services.obs.addObserver(function onInterAppCommConnect(subject, topic, data) {
  data = JSON.parse(data);
  shell.sendChromeEvent({ type: "inter-app-comm-permission",
                          chromeEventID: data.callerID,
                          manifestURL: data.manifestURL,
                          keyword: data.keyword,
                          peers: data.appsToSelect });
}, 'inter-app-comm-select-app', false);

Services.obs.addObserver(function onFullscreenOriginChange(subject, topic, data) {
  shell.sendChromeEvent({ type: "fullscreenoriginchange",
                          fullscreenorigin: data });
}, "fullscreen-origin-change", false);

DOMApplicationRegistry.registryStarted.then(function () {
  shell.sendChromeEvent({ type: 'webapps-registry-start' });
});
DOMApplicationRegistry.registryReady.then(function () {
  shell.sendChromeEvent({ type: 'webapps-registry-ready' });
});

Services.obs.addObserver(function onBluetoothVolumeChange(subject, topic, data) {
  shell.sendChromeEvent({
    type: "bluetooth-volumeset",
    value: data
  });
}, 'bluetooth-volume-change', false);

Services.obs.addObserver(function(subject, topic, data) {
  shell.sendCustomEvent('mozmemorypressure');
}, 'memory-pressure', false);

var CustomEventManager = {
  init: function custevt_init() {
    window.addEventListener("ContentStart", (function(evt) {
      let content = shell.contentBrowser.contentWindow;
      content.addEventListener("mozContentEvent", this, false, true);

      // After content starts to load for 10 seconds, send and
      // clean up the buffered open-app requests if there is any.
      //
      // TODO: Bug 793420 - Remove the waiting timer for the 'open-app'
      //                    mozChromeEvents requested by System Message
      shell.timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
      shell.timer.initWithCallback(function timerCallback() {
        shell.bufferedOpenAppReqs.forEach(function bufferOpenAppReq(msg) {
          shell.openAppForSystemMessage(msg);
        });
        shell.bufferedOpenAppReqs.length = 0;
        shell.needBufferOpenAppReq = false;
        shell.timer = null;
      }, 10000, Ci.nsITimer.TYPE_ONE_SHOT);
    }).bind(this), false);
  },

  handleEvent: function custevt_handleEvent(evt) {
    let detail = evt.detail;
    dump('XXX FIXME : Got a mozContentEvent: ' + detail.type + "\n");

    switch(detail.type) {
      case 'desktop-notification-show':
      case 'desktop-notification-click':
      case 'desktop-notification-close':
        AlertsHelper.handleEvent(detail);
        break;
      case 'webapps-install-granted':
      case 'webapps-install-denied':
        WebappsHelper.handleEvent(detail);
        break;
      case 'select-choicechange':
        FormsHelper.handleEvent(detail);
        break;
      case 'system-message-listener-ready':
        Services.obs.notifyObservers(null, 'system-message-listener-ready', null);
        break;
      case 'remote-debugger-prompt':
        RemoteDebugger.handleEvent(detail);
        break;
      case 'captive-portal-login-cancel':
        CaptivePortalLoginHelper.handleEvent(detail);
        break;
      case 'inter-app-comm-permission':
        Services.obs.notifyObservers(null, 'inter-app-comm-select-app-result',
          JSON.stringify({ callerID: detail.chromeEventID,
                           keyword: detail.keyword,
                           manifestURL: detail.manifestURL,
                           selectedApps: detail.peers }));
        break;
      case 'inputmethod-update-layouts':
        KeyboardHelper.handleEvent(detail);
        break;
      case 'nfc-hardware-state-change':
        Services.obs.notifyObservers(null, 'nfc-hardware-state-change',
          JSON.stringify({ nfcHardwareState: detail.nfcHardwareState }));
        break;
    }
  }
}

var AlertsHelper = {
  _listeners: {},
  _count: 0,

  handleEvent: function alert_handleEvent(detail) {
    if (!detail || !detail.id)
      return;

    let uid = detail.id;
    let listener = this._listeners[uid];
    if (!listener)
     return;

    let topic;
    if (detail.type == "desktop-notification-click") {
      topic = "alertclickcallback";
    } else if (detail.type == "desktop-notification-show") {
      topic = "alertshow";
    } else {
      /* desktop-notification-close */
      topic = "alertfinished";
    }

    if (uid.startsWith("alert")) {
      try {
        listener.observer.observe(null, topic, listener.cookie);
      } catch (e) { }
    } else {
      try {
        listener.mm.sendAsyncMessage("app-notification-return", {
          uid: uid,
          topic: topic,
          target: listener.target
        });
      } catch (e) {
        // we get an exception if the app is not launched yet
        gSystemMessenger.sendMessage("notification", {
            clicked: (detail.type === "desktop-notification-click"),
            title: listener.title,
            body: listener.text,
            imageURL: listener.imageURL,
            lang: listener.lang,
            dir: listener.dir,
            id: listener.id,
            tag: listener.tag
          },
          Services.io.newURI(listener.target, null, null),
          Services.io.newURI(listener.manifestURL, null, null)
        );
      }
    }

    // we're done with this notification
    if (topic === "alertfinished") {
      delete this._listeners[uid];
    }
  },

  registerListener: function alert_registerListener(alertId, cookie, alertListener) {
    this._listeners[alertId] = { observer: alertListener, cookie: cookie };
  },

  registerAppListener: function alert_registerAppListener(uid, listener) {
    this._listeners[uid] = listener;

    let app = DOMApplicationRegistry.getAppByManifestURL(listener.manifestURL);
    DOMApplicationRegistry.getManifestFor(app.manifestURL).then((manifest) => {
      let helper = new ManifestHelper(manifest, app.origin);
      let getNotificationURLFor = function(messages) {
        if (!messages)
          return null;

        for (let i = 0; i < messages.length; i++) {
          let message = messages[i];
          if (message === "notification") {
            return helper.fullLaunchPath();
          } else if (typeof message == "object" && "notification" in message) {
            return helper.resolveFromOrigin(message["notification"]);
          }
        }

        // No message found...
        return null;
      }

      listener.target = getNotificationURLFor(manifest.messages);

      // Bug 816944 - Support notification messages for entry_points.
    });
  },

  showNotification: function alert_showNotification(imageUrl,
                                                    title,
                                                    text,
                                                    textClickable,
                                                    cookie,
                                                    uid,
                                                    bidi,
                                                    lang,
                                                    manifestUrl) {
    function send(appName, appIcon) {
      shell.sendChromeEvent({
        type: "desktop-notification",
        id: uid,
        icon: imageUrl,
        title: title,
        text: text,
        bidi: bidi,
        lang: lang,
        appName: appName,
        appIcon: appIcon,
        manifestURL: manifestUrl
      });
    }

    if (!manifestUrl || !manifestUrl.length) {
      send(null, null);
      return;
    }

    // If we have a manifest URL, get the icon and title from the manifest
    // to prevent spoofing.
    let app = DOMApplicationRegistry.getAppByManifestURL(manifestUrl);
    DOMApplicationRegistry.getManifestFor(manifestUrl).then((aManifest) => {
      let helper = new ManifestHelper(aManifest, app.origin);
      send(helper.name, helper.iconURLForSize(128));
    });
  },

  showAlertNotification: function alert_showAlertNotification(imageUrl,
                                                              title,
                                                              text,
                                                              textClickable,
                                                              cookie,
                                                              alertListener,
                                                              name,
                                                              bidi,
                                                              lang) {
    let currentListener = this._listeners[name];
    if (currentListener) {
      currentListener.observer.observe(null, "alertfinished", currentListener.cookie);
    }

    this.registerListener(name, cookie, alertListener);
    this.showNotification(imageUrl, title, text, textClickable, cookie,
                          name, bidi, lang, null);
  },

  closeAlert: function alert_closeAlert(name) {
    shell.sendChromeEvent({
      type: "desktop-notification-close",
      id: name
    });
  },

  receiveMessage: function alert_receiveMessage(aMessage) {
    if (!aMessage.target.assertAppHasPermission("desktop-notification")) {
      Cu.reportError("Desktop-notification message " + aMessage.name +
                     " from a content process with no desktop-notification privileges.");
      return;
    }

    let data = aMessage.data;
    let details = data.details;
    let listener = {
      mm: aMessage.target,
      title: data.title,
      text: data.text,
      manifestURL: details.manifestURL,
      imageURL: data.imageURL,
      lang: details.lang || undefined,
      id: details.id || undefined,
      dir: details.dir || undefined,
      tag: details.tag || undefined
    };
    this.registerAppListener(data.uid, listener);

    this.showNotification(data.imageURL, data.title, data.text,
                          details.textClickable, null,
                          data.uid, details.dir,
                          details.lang, details.manifestURL);
  },
}

var WebappsHelper = {
  _installers: {},
  _count: 0,

  init: function webapps_init() {
    Services.obs.addObserver(this, "webapps-launch", false);
    Services.obs.addObserver(this, "webapps-ask-install", false);
    Services.obs.addObserver(this, "webapps-close", false);
  },

  registerInstaller: function webapps_registerInstaller(data) {
    let id = "installer" + this._count++;
    this._installers[id] = data;
    return id;
  },

  handleEvent: function webapps_handleEvent(detail) {
    if (!detail || !detail.id)
      return;

    let installer = this._installers[detail.id];
    delete this._installers[detail.id];
    switch (detail.type) {
      case "webapps-install-granted":
        DOMApplicationRegistry.confirmInstall(installer);
        break;
      case "webapps-install-denied":
        DOMApplicationRegistry.denyInstall(installer);
        break;
    }
  },

  observe: function webapps_observe(subject, topic, data) {
    let json = JSON.parse(data);
    json.mm = subject;

    switch(topic) {
      case "webapps-launch":
        DOMApplicationRegistry.getManifestFor(json.manifestURL).then((aManifest) => {
          if (!aManifest)
            return;

          let manifest = new ManifestHelper(aManifest, json.origin);
          let payload = {
            __exposedProps__: {
              timestamp: "r",
              url: "r",
              manifestURL: "r"
            },
            timestamp: json.timestamp,
            url: manifest.fullLaunchPath(json.startPoint),
            manifestURL: json.manifestURL
          }
          shell.sendEvent(getContentWindow(), "webapps-launch", payload);
        });
        break;
      case "webapps-ask-install":
        let id = this.registerInstaller(json);
        shell.sendChromeEvent({
          type: "webapps-ask-install",
          id: id,
          app: json.app
        });
        break;
      case "webapps-close":
        shell.sendEvent(getContentWindow(), "webapps-close",
          {
            __exposedProps__: { "manifestURL": "r" },
            "manifestURL": json.manifestURL
          });
        break;
    }
  }
}

let IndexedDBPromptHelper = {
  _quotaPrompt: "indexedDB-quota-prompt",
  _quotaResponse: "indexedDB-quota-response",

  init:
  function IndexedDBPromptHelper_init() {
    Services.obs.addObserver(this, this._quotaPrompt, false);
  },

  uninit:
  function IndexedDBPromptHelper_uninit() {
    Services.obs.removeObserver(this, this._quotaPrompt);
  },

  observe:
  function IndexedDBPromptHelper_observe(subject, topic, data) {
    if (topic != this._quotaPrompt) {
      throw new Error("Unexpected topic!");
    }

    let observer = subject.QueryInterface(Ci.nsIInterfaceRequestor)
                          .getInterface(Ci.nsIObserver);
    let responseTopic = this._quotaResponse;

    setTimeout(function() {
      observer.observe(null, responseTopic,
                       Ci.nsIPermissionManager.DENY_ACTION);
    }, 0);
  }
}

let RemoteDebugger = {
  _promptDone: false,
  _promptAnswer: false,
  _running: false,

  prompt: function debugger_prompt() {
    this._promptDone = false;

    shell.sendChromeEvent({
      "type": "remote-debugger-prompt"
    });

    while(!this._promptDone) {
      Services.tm.currentThread.processNextEvent(true);
    }

    return this._promptAnswer;
  },

  handleEvent: function debugger_handleEvent(detail) {
    this._promptAnswer = detail.value;
    this._promptDone = true;
  },

  get isDebugging() {
    if (!this._running) {
      return false;
    }

    return DebuggerServer._connections &&
           Object.keys(DebuggerServer._connections).length > 0;
  },

  // Start the debugger server.
  start: function debugger_start() {
    if (this._running) {
      return;
    }

    if (!DebuggerServer.initialized) {
      // Ask for remote connections.
      DebuggerServer.init(this.prompt.bind(this));

      // Add Firefox-specific actors, but prevent tab actors to be loaded in
      // the parent process, unless we enable certified apps debugging.
      let restrictPrivileges = Services.prefs.getBoolPref("devtools.debugger.forbid-certified-apps");
      DebuggerServer.addBrowserActors("navigator:browser", restrictPrivileges);
      DebuggerServer.addActors('chrome://b2g/content/dbg-browser-actors.js');

#ifdef MOZ_WIDGET_GONK
      DebuggerServer.onConnectionChange = function(what) {
        AdbController.updateState();
      }
#endif
    }

    let path = Services.prefs.getCharPref("devtools.debugger.unix-domain-socket") ||
               "/data/local/debugger-socket";
    try {
      DebuggerServer.openListener(path);
      // Temporary event, until bug 942756 lands and offers a way to know
      // when the server is up and running.
      Services.obs.notifyObservers(null, 'debugger-server-started', null);
      this._running = true;
    } catch (e) {
      dump('Unable to start debugger server: ' + e + '\n');
    }
  },

  stop: function debugger_stop() {
    if (!this._running) {
      return;
    }

    if (!DebuggerServer.initialized) {
      // Can this really happen if we are running?
      this._running = false;
      return;
    }

    try {
      DebuggerServer.closeListener();
    } catch (e) {
      dump('Unable to stop debugger server: ' + e + '\n');
    }
    this._running = false;
  }
}

let KeyboardHelper = {
  handleEvent: function keyboard_handleEvent(detail) {
    Keyboard.setLayouts(detail.layouts);
  }
};

// This is the backend for Gaia's screenshot feature.  Gaia requests a
// screenshot by sending a mozContentEvent with detail.type set to
// 'take-screenshot'.  Then we take a screenshot and send a
// mozChromeEvent with detail.type set to 'take-screenshot-success'
// and detail.file set to the an image/png blob
window.addEventListener('ContentStart', function ss_onContentStart() {
  let content = shell.contentBrowser.contentWindow;
  content.addEventListener('mozContentEvent', function ss_onMozContentEvent(e) {
    if (e.detail.type !== 'take-screenshot')
      return;

    try {
      var canvas = document.createElementNS('http://www.w3.org/1999/xhtml',
                                            'canvas');
      var width = window.innerWidth;
      var height = window.innerHeight;
      var scale = window.devicePixelRatio;
      canvas.setAttribute('width', width * scale);
      canvas.setAttribute('height', height * scale);

      var context = canvas.getContext('2d');
      var flags =
        context.DRAWWINDOW_DRAW_CARET |
        context.DRAWWINDOW_DRAW_VIEW |
        context.DRAWWINDOW_USE_WIDGET_LAYERS;
      context.scale(scale, scale);
      context.drawWindow(window, 0, 0, width, height,
                         'rgb(255,255,255)', flags);

      // I can't use sendChromeEvent() here because it doesn't wrap
      // the blob in the detail object correctly. So I use __exposedProps__
      // instead to safely send the chrome detail object to content.
      shell.sendEvent(getContentWindow(), 'mozChromeEvent', {
        __exposedProps__: { type: 'r', file: 'r' },
        type: 'take-screenshot-success',
        file: canvas.mozGetAsFile('screenshot', 'image/png')
      });
    } catch (e) {
      dump('exception while creating screenshot: ' + e + '\n');
      shell.sendChromeEvent({
        type: 'take-screenshot-error',
        error: String(e)
      });
    }
  });
});

(function contentCrashTracker() {
  Services.obs.addObserver(function(aSubject, aTopic, aData) {
      let props = aSubject.QueryInterface(Ci.nsIPropertyBag2);
      if (props.hasKey("abnormal") && props.hasKey("dumpID")) {
        shell.reportCrash(false, props.getProperty("dumpID"));
      }
    },
    "ipc:content-shutdown", false);
})();

var CaptivePortalLoginHelper = {
  init: function init() {
    Services.obs.addObserver(this, 'captive-portal-login', false);
    Services.obs.addObserver(this, 'captive-portal-login-abort', false);
  },
  handleEvent: function handleEvent(detail) {
    Services.captivePortalDetector.cancelLogin(detail.id);
  },
  observe: function observe(subject, topic, data) {
    shell.sendChromeEvent(JSON.parse(data));
  }
}

// Listen for crashes submitted through the crash reporter UI.
window.addEventListener('ContentStart', function cr_onContentStart() {
  let content = shell.contentBrowser.contentWindow;
  content.addEventListener("mozContentEvent", function cr_onMozContentEvent(e) {
    if (e.detail.type == "submit-crash" && e.detail.crashID) {
      debugCrashReport("submitting crash at user request ", e.detail.crashID);
      shell.submitCrash(e.detail.crashID);
    } else if (e.detail.type == "delete-crash" && e.detail.crashID) {
      debugCrashReport("deleting crash at user request ", e.detail.crashID);
      shell.deleteCrash(e.detail.crashID);
    }
  });
});

window.addEventListener('ContentStart', function update_onContentStart() {
  Cu.import('resource://gre/modules/WebappsUpdater.jsm');
  WebappsUpdater.handleContentStart(shell);

  let promptCc = Cc["@mozilla.org/updates/update-prompt;1"];
  if (!promptCc) {
    return;
  }

  let updatePrompt = promptCc.createInstance(Ci.nsIUpdatePrompt);
  if (!updatePrompt) {
    return;
  }

  updatePrompt.wrappedJSObject.handleContentStart(shell);
});

(function geolocationStatusTracker() {
  let gGeolocationActive = false;

  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    let oldState = gGeolocationActive;
    if (aData == "starting") {
      gGeolocationActive = true;
    } else if (aData == "shutdown") {
      gGeolocationActive = false;
    }

    if (gGeolocationActive != oldState) {
      shell.sendChromeEvent({
        type: 'geolocation-status',
        active: gGeolocationActive
      });
    }
}, "geolocation-device-events", false);
})();

(function headphonesStatusTracker() {
  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    shell.sendChromeEvent({
      type: 'headphones-status-changed',
      state: aData
    });
}, "headphones-status-changed", false);
})();

(function audioChannelChangedTracker() {
  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    shell.sendChromeEvent({
      type: 'audio-channel-changed',
      channel: aData
    });
}, "audio-channel-changed", false);
})();

(function defaultVolumeChannelChangedTracker() {
  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    shell.sendChromeEvent({
      type: 'default-volume-channel-changed',
      channel: aData
    });
}, "default-volume-channel-changed", false);
})();

(function visibleAudioChannelChangedTracker() {
  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    shell.sendChromeEvent({
      type: 'visible-audio-channel-changed',
      channel: aData
    });
    shell.visibleNormalAudioActive = (aData == 'normal');
}, "visible-audio-channel-changed", false);
})();

(function recordingStatusTracker() {
  // Recording status is tracked per process with following data structure:
  // {<processId>: {<requestURL>: {isApp: <isApp>,
  //                               count: <N>,
  //                               audioCount: <N>,
  //                               videoCount: <N>}}
  let gRecordingActiveProcesses = {};

  let recordingHandler = function(aSubject, aTopic, aData) {
    let props = aSubject.QueryInterface(Ci.nsIPropertyBag2);
    let processId = (props.hasKey('childID')) ? props.get('childID')
                                              : 'main';
    if (processId && !gRecordingActiveProcesses.hasOwnProperty(processId)) {
      gRecordingActiveProcesses[processId] = {};
    }

    let commandHandler = function (requestURL, command) {
      let currentProcess = gRecordingActiveProcesses[processId];
      let currentActive = currentProcess[requestURL];
      let wasActive = (currentActive['count'] > 0);
      let wasAudioActive = (currentActive['audioCount'] > 0);
      let wasVideoActive = (currentActive['videoCount'] > 0);

      switch (command.type) {
        case 'starting':
          currentActive['count']++;
          currentActive['audioCount'] += (command.isAudio) ? 1 : 0;
          currentActive['videoCount'] += (command.isVideo) ? 1 : 0;
          break;
        case 'shutdown':
          currentActive['count']--;
          currentActive['audioCount'] -= (command.isAudio) ? 1 : 0;
          currentActive['videoCount'] -= (command.isVideo) ? 1 : 0;
          break;
        case 'content-shutdown':
          currentActive['count'] = 0;
          currentActive['audioCount'] = 0;
          currentActive['videoCount'] = 0;
          break;
      }

      if (currentActive['count'] > 0) {
        currentProcess[requestURL] = currentActive;
      } else {
        delete currentProcess[requestURL];
      }

      // We need to track changes if any active state is changed.
      let isActive = (currentActive['count'] > 0);
      let isAudioActive = (currentActive['audioCount'] > 0);
      let isVideoActive = (currentActive['videoCount'] > 0);
      if ((isActive != wasActive) ||
          (isAudioActive != wasAudioActive) ||
          (isVideoActive != wasVideoActive)) {
        shell.sendChromeEvent({
          type: 'recording-status',
          active: isActive,
          requestURL: requestURL,
          isApp: currentActive['isApp'],
          isAudio: isAudioActive,
          isVideo: isVideoActive
        });
      }
    };

    switch (aData) {
      case 'starting':
      case 'shutdown':
        // create page record if it is not existed yet.
        let requestURL = props.get('requestURL');
        if (requestURL &&
            !gRecordingActiveProcesses[processId].hasOwnProperty(requestURL)) {
          gRecordingActiveProcesses[processId][requestURL] = {isApp: props.get('isApp'),
                                                              count: 0,
                                                              audioCount: 0,
                                                              videoCount: 0};
        }
        commandHandler(requestURL, { type: aData,
                                     isAudio: props.get('isAudio'),
                                     isVideo: props.get('isVideo')});
        break;
      case 'content-shutdown':
        // iterate through all the existing active processes
        Object.keys(gRecordingActiveProcesses[processId]).forEach(function(requestURL) {
          commandHandler(requestURL, { type: aData,
                                       isAudio: true,
                                       isVideo: true});
        });
        break;
    }

    // clean up process record if no page record in it.
    if (Object.keys(gRecordingActiveProcesses[processId]).length == 0) {
      delete gRecordingActiveProcesses[processId];
    }
  };
  Services.obs.addObserver(recordingHandler, 'recording-device-events', false);
  Services.obs.addObserver(recordingHandler, 'recording-device-ipc-events', false);

  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    // send additional recording events if content process is being killed
    let processId = aSubject.QueryInterface(Ci.nsIPropertyBag2).get('childID');
    if (gRecordingActiveProcesses.hasOwnProperty(processId)) {
      Services.obs.notifyObservers(aSubject, 'recording-device-ipc-events', 'content-shutdown');
    }
  }, 'ipc:content-shutdown', false);
})();

(function volumeStateTracker() {
  Services.obs.addObserver(function(aSubject, aTopic, aData) {
    shell.sendChromeEvent({
      type: 'volume-state-changed',
      active: (aData == 'Shared')
    });
}, 'volume-state-changed', false);
})();

#ifdef MOZ_WIDGET_GONK
// Devices don't have all the same partition size for /cache where we
// store the http cache.
(function setHTTPCacheSize() {
  let path = Services.prefs.getCharPref("browser.cache.disk.parent_directory");
  let volumeService = Cc["@mozilla.org/telephony/volume-service;1"]
                        .getService(Ci.nsIVolumeService);

  let stats = volumeService.createOrGetVolumeByPath(path).getStats();

  // We must set the size in KB, and keep a bit of free space.
  let size = Math.floor(stats.totalBytes / 1024) - 1024;
  Services.prefs.setIntPref("browser.cache.disk.capacity", size);
}) ()
#endif

#ifdef MOZ_WIDGET_GONK
let SensorsListener = {
  sensorsListenerDevices: ['crespo'],
  device: libcutils.property_get("ro.product.device"),

  deviceNeedsWorkaround: function SensorsListener_deviceNeedsWorkaround() {
    return (this.sensorsListenerDevices.indexOf(this.device) != -1);
  },

  handleEvent: function SensorsListener_handleEvent(evt) {
    switch(evt.type) {
      case 'devicemotion':
        // Listener that does nothing, we need this to have the sensor being
        // able to report correct values, as explained in bug 753245, comment 6
        // and in bug 871916
        break;

      default:
        break;
    }
  },

  observe: function SensorsListener_observe(subject, topic, data) {
    // We remove the listener when the screen is off, otherwise sensor will
    // continue to bother us with data and we won't be able to get the
    // system into suspend state, thus draining battery.
    if (data === 'on') {
      window.addEventListener('devicemotion', this);
    } else {
      window.removeEventListener('devicemotion', this);
    }
  },

  init: function SensorsListener_init() {
    if (this.deviceNeedsWorkaround()) {
      // On boot, enable the listener, screen will be on.
      window.addEventListener('devicemotion', this);

      // Then listen for further screen state changes
      Services.obs.addObserver(this, 'screen-state-changed', false);
    }
  }
}

SensorsListener.init();
#endif

// Calling this observer will cause a shutdown an a profile reset.
// Use eg. : Services.obs.notifyObservers(null, 'b2g-reset-profile', null);
Services.obs.addObserver(function resetProfile(subject, topic, data) {
  Services.obs.removeObserver(resetProfile, topic);

  // Listening for 'profile-before-change2' which is late in the shutdown
  // sequence, but still has xpcom access.
  Services.obs.addObserver(function clearProfile(subject, topic, data) {
    Services.obs.removeObserver(clearProfile, topic);
#ifdef MOZ_WIDGET_GONK
    let json = Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsIFile);
    json.initWithPath('/system/b2g/webapps/webapps.json');
    let toRemove = json.exists()
      // This is a user build, just rm -r /data/local /data/b2g/mozilla
      ? ['/data/local', '/data/b2g/mozilla']
      // This is an eng build. We clear the profile and a set of files
      // under /data/local.
      : ['/data/b2g/mozilla',
         '/data/local/permissions.sqlite',
         '/data/local/storage',
         '/data/local/OfflineCache'];

    toRemove.forEach(function(dir) {
      try {
        let file = Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsIFile);
        file.initWithPath(dir);
        file.remove(true);
      } catch(e) { dump(e); }
    });
#else
    // Desktop builds.
    let profile = Services.dirsvc.get('ProfD', Ci.nsIFile);

    // We don't want to remove everything from the profile, since this
    // would prevent us from starting up.
    let whitelist = ['defaults', 'extensions', 'settings.json',
                     'user.js', 'webapps'];
    let enumerator = profile.directoryEntries;
    while (enumerator.hasMoreElements()) {
      let file = enumerator.getNext().QueryInterface(Ci.nsIFile);
      if (whitelist.indexOf(file.leafName) == -1) {
        file.remove(true);
      }
    }
#endif
  },
  'profile-before-change2', false);

  let appStartup = Cc['@mozilla.org/toolkit/app-startup;1']
                     .getService(Ci.nsIAppStartup);
  appStartup.quit(Ci.nsIAppStartup.eForceQuit);
}, 'b2g-reset-profile', false);

/**
  * CID of our implementation of nsIDownloadManagerUI.
  */
const kTransferCid = Components.ID("{1b4c85df-cbdd-4bb6-b04e-613caece083c}");

/**
  * Contract ID of the service implementing nsITransfer.
  */
const kTransferContractId = "@mozilla.org/transfer;1";

// Override Toolkit's nsITransfer implementation with the one from the
// JavaScript API for downloads.  This will eventually be removed when
// nsIDownloadManager will not be available anymore (bug 851471).  The
// old code in this module will be removed in bug 899110.
Components.manager.QueryInterface(Ci.nsIComponentRegistrar)
                  .registerFactory(kTransferCid, "",
                                   kTransferContractId, null);