/* 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/. */

#include "domstubs.idl"

interface nsIURI;
interface nsIDOMWindow;
interface nsIMessageSender;

// Implemented by the contract id @mozilla.org/system-message-internal;1

[scriptable, uuid(59b6beda-f911-4d47-a296-8c81e6abcfb9)]
interface nsISystemMessagesInternal : nsISupports
{
  /*
   * Allow any internal user to send a message of a given type to a given page
   * of an app. The message will be sent to all the registered pages of the app
   * when |pageURI| is not specified.
   * @param type        The type of the message to be sent.
   * @param message     The message payload.
   * @param pageURI     The URI of the page that will be opened. Nullable.
   * @param manifestURI The webapp's manifest URI.
   * @param extra       Extra opaque information that will be passed around in the observer
   *                    notification to open the page.
   * returns a Promise
   */
  nsISupports sendMessage(in DOMString type, in jsval message,
                          in nsIURI pageURI, in nsIURI manifestURI,
                          [optional] in jsval extra);

  /*
   * Allow any internal user to broadcast a message of a given type.
   * The application that registers the message will be launched.
   * @param type        The type of the message to be sent.
   * @param message     The message payload.
   * @param extra       Extra opaque information that will be passed around in the observer
   *                    notification to open the page.
   * returns a Promise
   */
  nsISupports broadcastMessage(in DOMString type, in jsval message,
                               [optional] in jsval extra);

  /*
   * Registration of a page that wants to be notified of a message type.
   * @param type          The message type.
   * @param pageURI       The URI of the page that will be opened.
   * @param manifestURI   The webapp's manifest URI.
   */
  void registerPage(in DOMString type, in nsIURI pageURI, in nsIURI manifestURI);
};