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/* 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"

[scriptable, uuid(775edbf5-b4a9-400c-b0ad-ea3c3a027097)]
interface nsISystemUpdateListener : nsISupports
{
  /**
   * callback for notifying an update package is available for download.
   */
  void onUpdateAvailable(in DOMString type,
                         in DOMString version,
                         in DOMString description,
                         in unsigned long long buildDate,
                         in unsigned long long size);

  /**
   * callback for notifying the download progress.
   */
  void onProgress(in unsigned long long loaded, in unsigned long long total);

  /**
   * callback for notifying an update package is ready to apply.
   */
  void onUpdateReady();

  /**
   * callback for notifying any error while
   * checking/downloading/applying an update package.
   */
  void onError(in DOMString errMsg);
};

[scriptable, uuid(c9b7c166-b9cf-4396-a6de-39275e1c0a36)]
interface nsISystemUpdateProvider : nsISupports
{
  void checkForUpdate();
  void startDownload();
  void stopDownload();
  void applyUpdate();

  /**
   * Set the available parameter to the update provider.
   * The available parameter is implementation-dependent.
   * e.g. "update-url", "last-update-date", "update-status", "update-interval"
   *
   * @param  name      The number of languages.
   * @param  languages An array of languages.
   * @return true when setting an available parameter,
   *         false when setting an unavailable parameter.
   */
  bool setParameter(in DOMString name, in DOMString value);
  /**
   * Get the available parameter from the update provider.
   * The available parameter is implementation-dependent.
   *
   * @param  name The available parameter.
   * @return The corresponding value to the name.
   *         Return null if try to get unavailable parameter.
   */
  DOMString getParameter(in DOMString name);

  /**
   * NOTE TO IMPLEMENTORS:
   *   Need to consider if it is necessary to fire the pending event when 
   *   registering the listener.
   *   (E.g. UpdateAvailable or UpdateReady event.)
   */
  void setListener(in nsISystemUpdateListener listener);
  void unsetListener();
};