/*
 * This file is part of Adblock Plus <https://adblockplus.org/>,
 * Copyright (C) 2006-2017 eyeo GmbH
 *
 * Adblock Plus is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * Adblock Plus is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 */

(function(global)
{
  const Cc = Components.classes;
  const Ci = Components.interfaces;
  const Cu = Components.utils;

  var Services = Cu.import("resource://gre/modules/Services.jsm", {}).Services;

  function require(/**String*/ module)
  {
    var result = {};
    result.wrappedJSObject = result;
    Services.obs.notifyObservers(result, "adblockplus-require", module);
    return result.exports;
  }

  function getOuterWindowID()
  {
    if (!getOuterWindowID.result)
    {
      getOuterWindowID.result = window.QueryInterface(Ci.nsIInterfaceRequestor)
                                      .getInterface(Ci.nsIDOMWindowUtils)
                                      .outerWindowID;
    }
    return getOuterWindowID.result;
  }

  const Port = require("messaging").Port;

  if (!global.ext)
    global.ext = {};

  /* Message passing */
  var port = new Port(Cc["@mozilla.org/childprocessmessagemanager;1"]
                        .getService(Ci.nsIMessageSender));
  window.addEventListener("unload", function()
  {
    try
    {
      port.emit("ext_disconnect", getOuterWindowID());
    }
    catch (e)
    {
      // This is expected to fail if Adblock Plus was disabled/uninstalled with
      // the page still open.
    }
    port.disconnect();
  }, false);

  global.ext.onMessage = new global.ext._EventTarget(port, getOuterWindowID());
  global.ext.backgroundPage = {
    sendMessage: function(payload, responseCallback)
    {
      var message = {
        senderID: getOuterWindowID(),
        payload
      };
      if (typeof responseCallback == "function")
        port.emitWithResponse("ext_message", message).then(responseCallback);
      else
        port.emit("ext_message", message);
    }
  };

})(this);