/* ***** 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 the userChrome.js component.
 *
 * The Initial Developer of the Original Code is
 * Simon Bünzli <zeniko@gmail.com>
 *
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * alta88 <alta88@gmail.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 ***** */

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;

const UserChrome_js = {
  mCID: Components.ID("{8DEB3B5E-7585-4029-B6D0-4733CE8DED50}"),
  mContractID: "@userChromeJS;1",
  mClassName: "userChromeJS Loading Component",
  mCategory: "m-userChromeJS",

/* ........ nsIModule ....................................................... */

  getClassObject: function(aCompMgr, aCID, aIID) {
    if (!aCID.equals(this.mCID)) {
      Components.returnCode = Cr.NS_ERROR_FACTORY_NOT_REGISTERED;
      return null;
    }

    return this.QueryInterface(aIID);
  },

  registerSelf: function(aCompMgr, aFileSpec, aLocation, aType) {
    aCompMgr.QueryInterface(Ci.nsIComponentRegistrar).
             registerFactoryLocation(this.mCID,
                                     this.mCategory,
                                     this.mContractID,
                                     aFileSpec,
                                     aLocation,
                                     aType);

    Cc["@mozilla.org/categorymanager;1"].
    getService(Ci.nsICategoryManager).
    addCategoryEntry("app-startup",
                     this.mClassName,
                     "service," + this.mContractID,
                     true,
                     true);
  },

  unregisterSelf: function(aCompMgr, aLocation, aType) {
    aCompMgr.QueryInterface(Ci.nsIComponentRegistrar).
    unregisterFactoryLocation(this.mCID,
                              aLocation);

    Cc["@mozilla.org/categorymanager;1"].
    getService(Ci.nsICategoryManager).
    deleteCategoryEntry("app-startup",
                        "service," + this.mContractID,
                        true);
  },

  canUnload: function(aCompMgr) {
    return true;
  },

/* ........ nsIFactory ...................................................... */

  createInstance: function(aOuter, aIID) {
    if (aOuter != null) {
      Components.returnCode = Cr.NS_ERROR_NO_AGGREGATION;
      return null;
    }

    return this.QueryInterface(aIID);
  },

  lockFactory: function(aLock) { },

/* ........ nsIObserver ..................................................... */

  observe: function(aSubject, aTopic, aData) {
    var os = Cc["@mozilla.org/observer-service;1"].
             getService(Ci.nsIObserverService);

    switch (aTopic) {
    case "app-startup":
      os.addObserver(this, "final-ui-startup", false);
      break;
    case "final-ui-startup":
      var file = Cc["@mozilla.org/file/directory_service;1"].
                 getService(Ci.nsIProperties).
                 get("UChrm", Ci.nsILocalFile);
      file.append("userChrome.js");

      if (!file.exists()) {
        var componentFile = __LOCATION__;
        var componentsDir = componentFile.parent;
        var extensionDir = componentsDir.parent;
        extensionDir.append("README.txt");
        if (extensionDir.exists())
          extensionDir.copyTo(file.parent, "userChrome.js");
      }

      if (file.exists() && file.isFile() &&
          !Cc["@mozilla.org/xre/app-info;1"].
          getService(Ci.nsIXULRuntime).
          inSafeMode) {
        this.mFileURL = Cc["@mozilla.org/network/io-service;1"].
                        getService(Ci.nsIIOService).
                        getProtocolHandler("file").
                        QueryInterface(Ci.nsIFileProtocolHandler).
                        getURLSpecFromFile(file);

        os.addObserver(this, "domwindowopened", false);
      }
      break;
    case "domwindowopened":
      aSubject.addEventListener("load", this, true);
      break;
    }
  },

/* ........ nsIDOMEventListener ............................................. */

  handleEvent: function(aEvent) {
    var document = aEvent.originalTarget;
    if (document.location && document.location.protocol == "chrome:") {
      try {
        let loader = Cc["@mozilla.org/moz/jssubscript-loader;1"].
                     getService(Ci.mozIJSSubScriptLoader);

        loader.loadSubScript("chrome://userChromeJS/content/userChromeJS.js",
            document.defaultView);

        loader.loadSubScript(this.mFileURL, document.defaultView);
      }
      catch (ex) {
        // script execution can be stopped with |throw "stop";|
        if (ex !== "stop") {
          Cu.reportError(ex);
        }
      }
    }
  },

/* ........ QueryInterface .................................................. */

  QueryInterface: function(aIID) {
    if (!aIID.equals(Ci.nsISupports) && !aIID.equals(Ci.nsIModule) &&
        !aIID.equals(Ci.nsIFactory) && !aIID.equals(Ci.nsIObserver) &&
        !aIID.equals(Ci.nsIDOMEventListener)) {
      Components.returnCode = Cr.NS_ERROR_NO_INTERFACE;
      return null;
    }

    return this;
  },

};

function NSGetModule(aComMgr, aFileSpec) {
  return UserChrome_js;
}
