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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsIDOMWindow;
interface nsIRequest;
interface nsIRequestObserver;
interface nsISimpleEnumerator;
interface nsIFile;

webidl Element;
webidl Document;

/**
 * An interface that describes an object representing a patch file that can
 * be downloaded and applied to a version of this application so that it
 * can be updated.
 */
[scriptable, uuid(dc8fb8a9-3a53-4031-9469-2a5197ea30e7)]
interface nsIUpdatePatch : nsISupports
{
  /**
   * The type of this patch:
   * "partial"      A binary difference between two application versions
   * "complete"     A complete patch containing all of the replacement files
   *                to update to the new version
   */
  readonly attribute AString type;

  /**
   * The URL this patch was being downloaded from
   */
  readonly attribute AString URL;

  /**
   * The final URL this patch was being downloaded from
   */
  attribute AString finalURL;

  /**
   * The size of this file, in bytes.
   */
  readonly attribute unsigned long size;

  /**
   * The state of this patch
   */
  attribute AString state;

  /**
   * A numeric error code that conveys additional information about the state of
   * a failed update. If the update is not in the "failed" state the value is
   * zero. The possible values are located in common/updatererrors.h and values between
   * 80 and 99 are in nsUpdateService.js.
   */
  attribute long errorCode;

  /**
   * true if this patch is currently selected as the patch to be downloaded and
   * installed for this update transaction, false if another patch from this
   * update has been selected.
   */
  attribute boolean selected;

  /**
   * Serializes this patch object into a DOM Element
   * @param   updates
   *          The document to serialize into
   * @returns The DOM Element created by the serialization process
   */
  Element serialize(in Document updates);
};

/**
 * An interface that describes an object representing an available update to
 * the current application - this update may have several available patches
 * from which one must be selected to download and install, for example we
 * might select a binary difference patch first and attempt to apply that,
 * then if the application process fails fall back to downloading a complete
 * file-replace patch. This object also contains information about the update
 * that the front end and other application services can use to learn more
 * about what is going on.
 */
[scriptable, uuid(e094c045-f4ff-41fd-92da-cd2effd2c7c9)]
interface nsIUpdate : nsISupports
{
  /**
   * The type of update:
   *   "major"  A major new version of the Application
   *   "minor"  A minor update to the Application (e.g. security update)
   */
  readonly attribute AString type;

  /**
   * The name of the update, or "<Application Name> <Update Version>"
   */
  readonly attribute AString name;

  /**
   * The string to display in the user interface for the version. If you want
   * a real version number use appVersion.
   */
  readonly attribute AString displayVersion;

  /**
   * The Application version of this update.
   */
  readonly attribute AString appVersion;

  /**
   * The Application version prior to the application being updated.
   */
  readonly attribute AString previousAppVersion;

  /**
   * The Build ID of this update. Used to determine a particular build, down
   * to the hour, minute and second of its creation. This allows the system
   * to differentiate between several nightly builds with the same |version|
   * for example.
   */
  readonly attribute AString buildID;

  /**
   * The URL to a page which offers details about the content of this
   * update. Ideally, this page is not the release notes but some other page
   * that summarizes the differences between this update and the previous,
   * which also links to the release notes.
   */
  readonly attribute AString detailsURL;

  /**
   * The URL to the Update Service that supplied this update.
   */
  readonly attribute AString serviceURL;

  /**
   * The channel used to retrieve this update from the Update Service.
   */
  readonly attribute AString channel;

  /**
   * Whether the update is no longer supported on this system.
   */
  readonly attribute boolean unsupported;

  /**
   * Allows overriding the default amount of time in seconds before prompting the
   * user to apply an update. If not specified, the value of
   * app.update.promptWaitTime will be used.
   */
  attribute long long promptWaitTime;

  /**
   * Whether or not the update being downloaded is a complete replacement of
   * the user's existing installation or a patch representing the difference
   * between the new version and the previous version.
   */
  attribute boolean isCompleteUpdate;

  /**
   * When the update was installed.
   */
  attribute long long installDate;

  /**
   * A message associated with this update, if any.
   */
  attribute AString statusText;

  /**
   * The currently selected patch for this update.
   */
  readonly attribute nsIUpdatePatch selectedPatch;

  /**
   * The state of the selected patch:
   *   "downloading"        The update is being downloaded.
   *   "pending"            The update is ready to be applied.
   *   "pending-service"    The update is ready to be applied with the service.
   *   "pending-elevate"    The update is ready to be applied but requires elevation.
   *   "applying"           The update is being applied.
   *   "applied"            The update is ready to be switched to.
   *   "applied-os"         The update is OS update and to be installed.
   *   "applied-service"    The update is ready to be switched to with the service.
   *   "succeeded"          The update was successfully applied.
   *   "download-failed"    The update failed to be downloaded.
   *   "failed"             The update failed to be applied.
   */
  attribute AString state;

  /**
   * A numeric error code that conveys additional information about the state of
   * a failed update. If the update is not in the "failed" state the value is
   * zero. The possible values are located in common/updatererrors.h and values between
   * 80 and 99 are in nsUpdateService.js.
   */
  attribute long errorCode;

  /**
   * Whether an elevation failure has been encountered for this update.
   */
  attribute boolean elevationFailure;

  /**
   * The number of patches supplied by this update.
   */
  readonly attribute unsigned long patchCount;

  /**
   * Retrieves a patch.
   * @param   index
   *          The index of the patch to retrieve.
   * @returns The nsIUpdatePatch at the specified index.
   */
  nsIUpdatePatch getPatchAt(in unsigned long index);

  /**
   * Serializes this update object into a DOM Element
   * @param   updates
   *          The document to serialize into
   * @returns The DOM Element created by the serialization process
   */
  Element serialize(in Document updates);
};

/**
 * An interface describing an object that listens to the progress of an update
 * check operation. This object is notified as the check continues, finishes
 * and if it has an error.
 */
[scriptable, uuid(4aa2b4bb-39ea-407b-98ff-89f19134d4c0)]
interface nsIUpdateCheckListener : nsISupports
{
  /**
   * The update check was completed.
   * @param   request
   *          The XMLHttpRequest handling the update check.
   * @param   updates
   *          An array of nsIUpdate objects listing available updates.
   */
  void onCheckComplete(in jsval request, in Array<nsIUpdate> updates);

  /**
   * An error occurred while loading the remote update service file.
   * @param   request
   *          The XMLHttpRequest handling the update check.
   * @param   update
   *          A nsIUpdate object that contains details about the
   *          error in its |statusText| property.
   */
  void onError(in jsval request,
               in nsIUpdate update);
};

/**
 * An interface describing an object that knows how to check for updates.
 */
[scriptable, uuid(877ace25-8bc5-452a-8586-9c1cf2871994)]
interface nsIUpdateChecker : nsISupports
{
  /**
   * Checks for available updates, notifying a listener of the results.
   * @param   listener
   *          An object implementing nsIUpdateCheckListener which is notified
   *          of the results of an update check.
   * @param   force
   *          Forces the checker to check for updates, regardless of the
   *          current value of the user's update settings. This is used by
   *          any piece of UI that offers the user the imperative option to
   *          check for updates now, regardless of their update settings.
   *          However, if updates are disabled by policy, setting force to true
   *          will not override the the policy.
   */
  void checkForUpdates(in nsIUpdateCheckListener listener, in boolean force);

  /**
   * Ends any pending update check.
   */
  void stopCurrentCheck();
};

/**
 * An interface describing a global application service that handles performing
 * background update checks and provides utilities for selecting and
 * downloading update patches.
 */
[scriptable, uuid(1107d207-a263-403a-b268-05772ec10757)]
interface nsIApplicationUpdateService : nsISupports
{
  /**
   * Checks for available updates in the background using the listener provided
   * by the application update service for background checks.
   */
  void checkForBackgroundUpdates();

  /**
   * The Update Checker used for background update checking.
   */
  readonly attribute nsIUpdateChecker backgroundChecker;

  /**
   * Selects the best update to install from a list of available updates.
   * @param   updates
   *          An array of updates that are available
   */
  nsIUpdate selectUpdate(in Array<nsIUpdate> updates);

  /**
   * Adds a listener that receives progress and state information about the
   * update that is currently being downloaded, e.g. to update a user
   * interface.
   * @param   listener
   *          An object implementing nsIRequestObserver and optionally
   *          nsIProgressEventSink that is to be notified of state and
   *          progress information as the update is downloaded.
   */
  void addDownloadListener(in nsIRequestObserver listener);

  /**
   * Removes a listener that is receiving progress and state information
   * about the update that is currently being downloaded.
   * @param   listener
   *          The listener object to remove.
   */
  void removeDownloadListener(in nsIRequestObserver listener);

  /**
   *
   */
  AString downloadUpdate(in nsIUpdate update, in boolean background);

  /**
   * Get the Active Updates directory
   * @returns An nsIFile for the active updates directory.
   */
  nsIFile getUpdatesDirectory();

  /**
   * Stop the active update download process. This is the equivalent of
   * calling nsIRequest::Cancel on the download's nsIRequest. When downloading
   * with nsIIncrementalDownload, this will leave the partial download in place.
   * When downloading with BITS, any partial download progress will be removed.
   */
  void stopDownload();

  /**
   * Whether or not there is an download happening at the moment.
   */
  readonly attribute boolean isDownloading;

  /**
   * Whether or not the Update Service can check for updates. This is a function
   * of whether or not application update is disabled by the application and the
   * platform the application is running on.
   */
  readonly attribute boolean canCheckForUpdates;

  /**
   * Whether or not the installation requires elevation. Currently only
   * implemented on OSX, returns false on other platforms.
   */
  readonly attribute boolean elevationRequired;

  /**
   * Whether or not the Update Service can download and install updates.
   * On Windows, this is a function of whether or not the maintenance service
   * is installed and enabled. On other systems, and as a fallback on Windows,
   * this depends on whether the current user has write access to the install
   * directory.
   */
  readonly attribute boolean canApplyUpdates;

  /**
   * Whether or not a different instance is handling updates of this
   * installation.  This currently only ever returns true on Windows
   * when 2 instances of an application are open. Only one of the instances
   * will actually handle updates for the installation.
   */
  readonly attribute boolean isOtherInstanceHandlingUpdates;

  /**
   * Whether the Update Service is able to stage updates.
   */
  readonly attribute boolean canStageUpdates;
};

/**
 * An interface describing a component which handles the job of processing
 * an update after it's been downloaded.
 */
[scriptable, uuid(74439497-d796-4915-8cef-3dfe43027e4d)]
interface nsIUpdateProcessor : nsISupports
{
  /**
   * Stages an update while the application is running.
   */
  void processUpdate();

  /**
   * Attempts to fix the permissions of the update directory. This can be done
   * in two ways. Firefox can attempt to fix the permissions itself, or it can
   * call into the maintenance service to request that it attempt to fix the
   * permissions.
   *
   * Fixing the permissions can take some time, so this work is all done off of
   * the main thread.
   *
   * Currently, this function only has a Windows implementation. On other
   * operating systems, it will throw NS_ERROR_NOT_IMPLEMENTED.
   *
   * Since this function does its work off of the main thread and does not
   * block, it will only throw if it was unable to dispatch to another thread.
   *
   * @param useServiceOnFailure
   *        If set to false, Firefox will attempt to fix the permissions itself,
   *        but the maintenance service will not be used. If set to true and
   *        Firefox is unable to fix the permissions itself, it will attempt to
   *        call into the maintenance service to request that it attempt to fix
   *        the permissions.
   */
  void fixUpdateDirectoryPerms(in boolean useServiceOnFailure);
};

/**
 * An interface describing a global application service that maintains a list
 * of updates previously performed as well as the current active update.
 */
[scriptable, uuid(0f1098e9-a447-4af9-b030-6f8f35c85f89)]
interface nsIUpdateManager : nsISupports
{
  /**
   * Gets the update at the specified index
   * @param   index
   *          The index within the updates array
   * @returns The nsIUpdate object at the specified index
   */
  nsIUpdate getUpdateAt(in long index);

  /**
   * Gets the total number of updates in the history list.
   */
  readonly attribute long updateCount;

  /**
   * The active (current) update. The active update is not in the history list.
   */
  attribute nsIUpdate activeUpdate;

  /**
   * Saves all updates to disk.
   */
  void saveUpdates();

  /**
   * Refresh the update status based on the information in update.status.
   */
  void refreshUpdateStatus();

  /**
   * The user agreed to proceed with an elevated update and we are now
   * permitted to show an elevation prompt.
   */
  void elevationOptedIn();

  /**
   * Clean up and remove the active update without applying it.
   */
  void cleanupActiveUpdate();
};