/* 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 "nsISupports.idl"

interface nsIInputStream;
interface nsIPresentationAvailabilityListener;
interface nsIPresentationRespondingListener;
interface nsIPresentationSessionListener;

%{C++
#define PRESENTATION_SERVICE_CID \
  { 0x1d9bb10c, 0xc0ab, 0x4fe8, \
    { 0x9e, 0x4f, 0x40, 0x58, 0xb8, 0x51, 0x98, 0x32 } }
#define PRESENTATION_SERVICE_CONTRACTID \
  "@mozilla.org/presentation/presentationservice;1"
%}

[scriptable, uuid(12073206-0065-4b10-9488-a6eb9b23e65b)]
interface nsIPresentationServiceCallback : nsISupports
{
  /*
   * Called when the operation succeeds.
   */
  void notifySuccess();

  /*
   * Called when the operation fails.
   *
   * @param error: error message.
   */
  void notifyError(in nsresult error);
};

[scriptable, uuid(5a254519-45c3-4229-9b16-f58c05b78fc6)]
interface nsIPresentationService : nsISupports
{
  /*
   * Start a new presentation session and display a prompt box which asks users
   * to select a device.
   *
   * @param url: The url of presenting page.
   * @param sessionId: An ID to identify presentation session.
   * @param origin: The url of requesting page.
   * @param callback: Invoke the callback when the operation is completed.
   *                  NotifySuccess() is called with |id| if a session is
   *                  established successfully with the selected device.
   *                  Otherwise, NotifyError() is called with a error message.
   */
  void startSession(in DOMString url,
                    in DOMString sessionId,
                    in DOMString origin,
                    in nsIPresentationServiceCallback callback);

  /*
   * Send the message wrapped with an input stream to the session.
   *
   * @param sessionId: An ID to identify presentation session.
   * @param stream: The message is converted to an input stream.
   */
  void sendSessionMessage(in DOMString sessionId,
                          in nsIInputStream stream);

  /*
   * Terminate the session.
   *
   * @param sessionId: An ID to identify presentation session.
   */
  void terminate(in DOMString sessionId);

  /*
   * Register an availability listener. Must be called from the main thread.
   *
   * @param listener: The listener to register.
   */
  void registerAvailabilityListener(in nsIPresentationAvailabilityListener listener);

  /*
   * Unregister an availability listener. Must be called from the main thread.
   * @param listener: The listener to unregister.
   */
  void unregisterAvailabilityListener(in nsIPresentationAvailabilityListener listener);

  /*
   * Register a session listener. Must be called from the main thread.
   *
   * @param sessionId: An ID to identify presentation session.
   * @param listener: The listener to register.
   */
  void registerSessionListener(in DOMString sessionId,
                               in nsIPresentationSessionListener listener);

  /*
   * Unregister a session listener. Must be called from the main thread.
   *
   * @param sessionId: An ID to identify presentation session.
   */
  void unregisterSessionListener(in DOMString sessionId);

  /*
   * Register a responding listener. Must be called from the main thread.
   *
   * @param windowId: The window ID associated with the listener.
   * @param listener: The listener to register.
   */
  void registerRespondingListener(in uint64_t windowId,
                                  in nsIPresentationRespondingListener listener);

  /*
   * Unregister a responding listener. Must be called from the main thread.
   * @param windowId: The window ID associated with the listener.
   */
  void unregisterRespondingListener(in uint64_t windowId);

  /*
   * Check if the presentation instance has an existent session ID at launch.
   * An empty string is always returned at sender side. Whereas at receiver side
   * the associated session ID is returned if the window ID and URI are matched;
   * otherwise an empty string is returned.
   *
   * @param windowId: The inner window ID used to look up the session ID.
   */
  DOMString getExistentSessionIdAtLaunch(in uint64_t windowId);

  /*
   * Notify the receiver page is ready for presentation use.
   *
   * @param sessionId: An ID to identify presentation session.
   * @param windowId: The inner window ID associated with the presentation
   *                  session. (0 implies no window ID since no actual window
   *                  uses 0 as its ID.)
   */
  void notifyReceiverReady(in DOMString sessionId,
                           [optional] in uint64_t windowId);

  /*
   * Untrack the relevant info about the presentation session if there's any.
   *
   * @param sessionId: An ID to identify presentation session.
   */
  void untrackSessionInfo(in DOMString sessionId);
};