const { classes: Cc, interfaces: Ci, utils: Cu } = Components;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");

const HELPERAPP_DIALOG_CONTRACT = "@mozilla.org/helperapplauncherdialog;1";
const HELPERAPP_DIALOG_CID =
  Components.ID(Cc[HELPERAPP_DIALOG_CONTRACT].number);

const FAKE_CID = Cc["@mozilla.org/uuid-generator;1"].
                   getService(Ci.nsIUUIDGenerator).generateUUID();

function HelperAppLauncherDialog() {}
HelperAppLauncherDialog.prototype = {
  show: function(aLauncher, aWindowContext, aReason) {
    sendAsyncMessage("suggestedFileName", aLauncher.suggestedFileName);
  },
  QueryInterface: XPCOMUtils.generateQI([Ci.nsIHelperAppLauncherDialog])
};

var registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
registrar.registerFactory(FAKE_CID, "", HELPERAPP_DIALOG_CONTRACT,
                          XPCOMUtils._getFactory(HelperAppLauncherDialog));

addMessageListener("unregister", function() {
  registrar.registerFactory(HELPERAPP_DIALOG_CID, "",
                            HELPERAPP_DIALOG_CONTRACT, null);
  sendAsyncMessage("unregistered");
});