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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 nsIFile;
interface nsIURI;
interface nsITransaction;
interface nsINavHistoryBatchCallback;

/**
 * Observer for bookmarks changes.
 */
[scriptable, uuid(4d00c221-2c4a-47ab-a617-abb324110492)]
interface nsINavBookmarkObserver : nsISupports
{
  /*
   * This observer should not be called for items that are tags.
   */
  readonly attribute boolean skipTags;

  /*
   * This observer should not be called for descendants when the parent is removed.
   * For example when revmoing a folder containing bookmarks.
   */
  readonly attribute boolean skipDescendantsOnItemRemoval;

  /**
   * Notifies that a batch transaction has started.
   * Other notifications will be sent during the batch, but the observer is
   * guaranteed that onEndUpdateBatch() will be called at its completion.
   * During a batch the observer should do its best to reduce the work done to
   * handle notifications, since multiple changes are going to happen in a short
   * timeframe.
   */
  void onBeginUpdateBatch();

  /**
   * Notifies that a batch transaction has ended.
   */
  void onEndUpdateBatch();

  /**
   * Notifies that an item was removed.  Called after the actual remove took
   * place.
   * When an item is removed, all the items following it in the same folder
   * will have their index shifted down, but no additional notifications will
   * be sent.
   *
   * @param aItemId
   *        The id of the item that was removed.
   * @param aParentId
   *        The id of the folder from which the item was removed.
   * @param aIndex
   *        The bookmark's index in the folder.
   * @param aItemType
   *        The type of the item to be removed (see TYPE_* constants below).
   * @param aURI
   *        The URI of the added item if it was TYPE_BOOKMARK, null otherwise.
   * @param aGuid
   *        The unique ID associated with the item.
   * @param aParentGuid
   *        The unique ID associated with the item's parent.
   * @param aSource
   *        A change source constant from nsINavBookmarksService::SOURCE_*,
   *        passed to the method that notifies the observer.
   */
  void onItemRemoved(in long long aItemId,
                     in long long aParentId,
                     in long aIndex,
                     in unsigned short aItemType,
                     in nsIURI aURI,
                     in ACString aGuid,
                     in ACString aParentGuid,
                     in unsigned short aSource);

  /**
   * Notifies that an item's information has changed.  This will be called
   * whenever any attributes like "title" are changed.
   *
   * @param aItemId
   *        The id of the item that was changed.
   * @param aProperty
   *        The property which changed.  Can be null for the removal of all of
   *        the annotations, in this case aIsAnnotationProperty is true.
   * @param aIsAnnotationProperty
   *        Whether or not aProperty is the name of an annotation.  If true
   *        aNewValue is always an empty string.
   * @param aNewValue
   *        For certain properties, this is set to the new value of the
   *        property (see the list below).
   * @param aLastModified
   *        The updated last-modified value.
   * @param aItemType
   *        The type of the item to be removed (see TYPE_* constants below).
   * @param aParentId
   *        The id of the folder containing the item.
   * @param aGuid
   *        The unique ID associated with the item.
   * @param aParentGuid
   *        The unique ID associated with the item's parent.
   * @param aOldValue
   *        For certain properties, this is set to the new value of the
   *        property (see the list below).
   * @param aSource
   *        A change source constant from nsINavBookmarksService::SOURCE_*,
   *        passed to the method that notifies the observer.
   *
   * @note List of values that may be associated with properties:
   *       aProperty     | aNewValue
   *       =====================================================================
   *       guid          | The new bookmark guid.
   *       cleartime     | Empty string (all visits to this item were removed).
   *       title         | The new title.
   *       favicon       | The "moz-anno" URL of the new favicon.
   *       uri           | new URL.
   *       tags          | Empty string (tags for this item changed)
   *       dateAdded     | PRTime (as string) when the item was first added.
   *       lastModified  | PRTime (as string) when the item was last modified.
   *
   *       aProperty     | aOldValue
   *       =====================================================================
   *       guid          | The old bookmark guid.
   *       cleartime     | Empty string (currently unused).
   *       title         | Empty string (currently unused).
   *       favicon       | Empty string (currently unused).
   *       uri           | old URL.
   *       tags          | Empty string (currently unused).
   *       dateAdded     | Empty string (currently unused).
   *       lastModified  | Empty string (currently unused).
   */
  void onItemChanged(in long long aItemId,
                     in ACString aProperty,
                     in boolean aIsAnnotationProperty,
                     in AUTF8String aNewValue,
                     in PRTime aLastModified,
                     in unsigned short aItemType,
                     in long long aParentId,
                     in ACString aGuid,
                     in ACString aParentGuid,
                     in AUTF8String aOldValue,
                     in unsigned short aSource);

  /**
   * Notifies that the item was visited.  Can be invoked only for TYPE_BOOKMARK
   * items.
   *
   * @param aItemId
   *        The id of the bookmark that was visited.
   * @param aVisitId
   *        The id of the visit.
   * @param aTime
   *        The time of the visit.
   * @param aTransitionType
   *        The transition for the visit.  See nsINavHistoryService::TRANSITION_*
   *        constants for a list of possible values.
   * @param aURI
   *        The nsIURI for this bookmark.
   * @param aParentId
   *        The id of the folder containing the item.
   * @param aGuid
   *        The unique ID associated with the item.
   * @param aParentGuid
   *        The unique ID associated with the item's parent.
   *
   * @see onItemChanged with property = "cleartime" for when all visits to an
   *      item are removed.
   *
   * @note The reported time is the time of the visit that was added, which may
   *       be well in the past since the visit time can be specified.  This
   *       means that the visit the observer is told about may not be the most
   *       recent visit for that page.
   */
  void onItemVisited(in long long aItemId,
                     in long long aVisitId,
                     in PRTime aTime,
                     in unsigned long aTransitionType,
                     in nsIURI aURI,
                     in long long aParentId,
                     in ACString aGuid,
                     in ACString aParentGuid);

  /**
   * Notifies that an item has been moved.
   *
   * @param aItemId
   *        The id of the item that was moved.
   * @param aOldParentId
   *        The id of the old parent.
   * @param aOldIndex
   *        The old index inside the old parent.
   * @param aNewParentId
   *        The id of the new parent.
   * @param aNewIndex
   *        The index inside the new parent.
   * @param aItemType
   *        The type of the item to be removed (see TYPE_* constants below).
   * @param aGuid
   *        The unique ID associated with the item.
   * @param aOldParentGuid
   *        The unique ID associated with the old item's parent.
   * @param aNewParentGuid
   *        The unique ID associated with the new item's parent.
   * @param aSource
   *        A change source constant from nsINavBookmarksService::SOURCE_*,
   *        passed to the method that notifies the observer.
   * @param aURI
   *        The URI for this bookmark.
   */
  void onItemMoved(in long long aItemId,
                   in long long aOldParentId,
                   in long aOldIndex,
                   in long long aNewParentId,
                   in long aNewIndex,
                   in unsigned short aItemType,
                   in ACString aGuid,
                   in ACString aOldParentGuid,
                   in ACString aNewParentGuid,
                   in unsigned short aSource,
                   in AUTF8String aURI);
};

/**
 * The BookmarksService interface provides methods for managing bookmarked
 * history items.  Bookmarks consist of a set of user-customizable
 * folders.  A URI in history can be contained in one or more such folders.
 */

[scriptable, uuid(24533891-afa6-4663-b72d-3143d03f1b04)]
interface nsINavBookmarksService : nsISupports
{
  /**
   * The item ID of the Places root.
   */
  readonly attribute long long placesRoot;

  /**
   * The item ID of the bookmarks menu folder.
   */
  readonly attribute long long bookmarksMenuFolder;

  /**
   * The item ID of the top-level folder that contain the tag "folders".
   */
  readonly attribute long long tagsFolder;

  /**
   * The item ID of the personal toolbar folder.
   */
  readonly attribute long long toolbarFolder;

  /**
   * The total number of Sync changes (inserts, updates, deletes, merges, and
   * uploads) recorded since Places startup for all bookmarks.
   *
   * Note that this is *not* the number of bookmark syncs. It's a monotonically
   * increasing counter incremented for every change that affects a bookmark's
   * `syncChangeCounter`.
   *
   * The counter can be used to avoid keeping an exclusive transaction open for
   * time-consuming work. One way to do that is to store the current value of
   * the counter, do the work, start a transaction, check the current value
   * again, and compare it to the stored value to determine if the database
   * changed during the work.
   *
   * The bookmarks mirror does this to check for changes between building and
   * applying a merged tree. This avoids blocking the main Places connection
   * during the merge, and ensures that the new tree still applies cleanly.
   */
  readonly attribute long long totalSyncChanges;

  /**
   * This value should be used for APIs that allow passing in an index
   * where an index is not known, or not required to be specified.
   * e.g.: When appending an item to a folder.
   */
  const short DEFAULT_INDEX = -1;

  const unsigned short TYPE_BOOKMARK = 1;
  const unsigned short TYPE_FOLDER = 2;
  const unsigned short TYPE_SEPARATOR = 3;
  // Dynamic containers are deprecated and unsupported.
  // This const exists just to avoid reusing the value.
  const unsigned short TYPE_DYNAMIC_CONTAINER = 4;

  // Change source constants. These are used to distinguish changes made by
  // Sync and bookmarks import from other Places consumers, though they can
  // be extended to support other callers. Sources are passed as optional
  // parameters to methods used by Sync, and forwarded to observers.
  const unsigned short SOURCE_DEFAULT = 0;
  const unsigned short SOURCE_SYNC = 1;
  const unsigned short SOURCE_IMPORT = 2;
  const unsigned short SOURCE_SYNC_REPARENT_REMOVED_FOLDER_CHILDREN = 4;
  const unsigned short SOURCE_RESTORE = 5;
  const unsigned short SOURCE_RESTORE_ON_STARTUP = 6;

  /**
   * Sync status flags, stored in Places for each item. These affect conflict
   * resolution, when an item is changed both locally and remotely; deduping,
   * when a local item matches a remote item with similar contents and different
   * GUIDs; and whether we write a tombstone when an item is deleted locally.
   *
   * Status  | Description               | Conflict   | Can     | Needs
   *         |                           | resolution | dedupe? | tombstone?
   * -----------------------------------------------------------------------
   * UNKNOWN | Automatically restored    | Prefer     | No      | No
   *         | on startup to recover     | deletion   |         |
   *         | from database corruption, |            |         |
   *         | or sync ID change on      |            |         |
   *         | server.                   |            |         |
   * -----------------------------------------------------------------------
   * NEW     | Item not uploaded to      | Prefer     | Yes     | No
   *         | server yet, or Sync       | newer      |         |
   *         | disconnected.             |            |         |
   * -----------------------------------------------------------------------
   * NORMAL  | Item uploaded to server.  | Prefer     | No      | Yes
   *         |                           | newer      |         |
   */
  const unsigned short SYNC_STATUS_UNKNOWN = 0;
  const unsigned short SYNC_STATUS_NEW = 1;
  const unsigned short SYNC_STATUS_NORMAL = 2;

  /**
   * Inserts a child bookmark into the given folder.
   *
   *  @param aParentId
   *         The id of the parent folder
   *  @param aURI
   *         The URI to insert
   *  @param aIndex
   *         The index to insert at, or DEFAULT_INDEX to append
   *  @param aTitle
   *         The title for the new bookmark
   *  @param [optional] aGuid
   *         The GUID to be set for the new item.  If not set, a new GUID is
   *         generated.  Unless you've a very sound reason, such as an undo
   *         manager implementation, do not pass this argument.
   *  @param [optional] aSource
   *         The change source. This is forwarded to all bookmark observers,
   *         allowing them to distinguish between insertions from different
   *         callers. Defaults to SOURCE_DEFAULT if omitted.
   *  @return The ID of the newly-created bookmark.
   *
   *  @note aTitle will be truncated to TITLE_LENGTH_MAX and
   *        aURI will be truncated to URI_LENGTH_MAX.
   *  @throws if aGuid is malformed.
   */
  long long insertBookmark(in long long aParentId, in nsIURI aURI,
                           in long aIndex, in AUTF8String aTitle,
                           [optional] in ACString aGuid,
                           [optional] in unsigned short aSource);

  /**
   * Removes a child item. Used to delete a bookmark or separator.
   *  @param aItemId
   *         The child item to remove
   *  @param [optional] aSource
   *         The change source, forwarded to all bookmark observers. Defaults
   *         to SOURCE_DEFAULT.
   */
  void removeItem(in long long aItemId, [optional] in unsigned short aSource);

  /**
   * Creates a new child folder and inserts it under the given parent.
   *  @param aParentFolder
   *         The id of the parent folder
   *  @param aName
   *         The name of the new folder
   *  @param aIndex
   *         The index to insert at, or DEFAULT_INDEX to append
   *  @param [optional] aGuid
   *         The GUID to be set for the new item.  If not set, a new GUID is
   *         generated.  Unless you've a very sound reason, such as an undo
   *         manager implementation, do not pass this argument.
   *  @param [optional] aSource
   *         The change source, forwarded to all bookmark observers. Defaults
   *         to SOURCE_DEFAULT.
   *  @return The ID of the newly-inserted folder.
   *  @throws if aGuid is malformed.
   */
  long long createFolder(in long long aParentFolder, in AUTF8String name,
                         in long index,
                         [optional] in ACString aGuid,
                         [optional] in unsigned short aSource);

  /**
   * Set the title for an item.
   *  @param aItemId
   *         The id of the item whose title should be updated.
   *  @param aTitle
   *         The new title for the bookmark.
   *  @param [optional] aSource
   *         The change source, forwarded to all bookmark observers. Defaults
   *         to SOURCE_DEFAULT.
   *
   *  @note  aTitle will be truncated to TITLE_LENGTH_MAX.
   */
  void setItemTitle(in long long aItemId, in AUTF8String aTitle,
                    [optional] in unsigned short aSource);

  /**
   * Get the title for an item.
   *
   * If no item title is available it will return a void string (null in JS).
   *
   *  @param aItemId
   *         The id of the item whose title should be retrieved
   *  @return The title of the item.
   */
  AUTF8String getItemTitle(in long long aItemId);

  /**
   * Set the last modified time for an item.
   *
   * @param aItemId
   *        the id of the item whose last modified time should be updated.
   * @param aLastModified
   *        the new last modified value in microseconds.  Note that it is
   *        rounded down to milliseconds precision.
   * @param [optional] aSource
   *        The change source, forwarded to all bookmark observers. Defaults
   *        to SOURCE_DEFAULT.
   *
   * @note This is the only method that will send an itemChanged notification
   *       for the property.  lastModified will still be updated in
   *       any other method that changes an item property, but we will send
   *       the corresponding itemChanged notification instead.
   */
  void setItemLastModified(in long long aItemId,
                           in PRTime aLastModified,
                           [optional] in unsigned short aSource);

  /**
   * Get the parent folder's id for an item.
   */
  long long getFolderIdForItem(in long long aItemId);

  /**
   * Adds a bookmark observer. If ownsWeak is false, the bookmark service will
   * keep an owning reference to the observer.  If ownsWeak is true, then
   * aObserver must implement nsISupportsWeakReference, and the bookmark
   * service will keep a weak reference to the observer.
   */
  void addObserver(in nsINavBookmarkObserver observer,
                   [optional] in boolean ownsWeak);

  /**
   * Removes a bookmark observer.
   */
  void removeObserver(in nsINavBookmarkObserver observer);

  /**
   * Gets an array of registered nsINavBookmarkObserver objects.
   */
  void getObservers([optional] out unsigned long count,
                    [retval, array, size_is(count)] out nsINavBookmarkObserver observers);
};