/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Places code.
 *
 * The Initial Developer of the Original Code is
 * Google Inc.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brett Wilson <brett@gmail.com>
 *   Dietrich Ayala <dietrich@mozilla.com>
 *   Marco Bonardo <mak77@bonardo.net>
 *   Asaf Romano <mano@mozilla.com>
 *   Drew Willcoxon <adw@mozilla.com>
 *   Philipp von Weitershausen <philipp@weitershausen.de>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/**
 * Using Places services after quit-application is not reliable, so make
 * sure to do any shutdown work on quit-application, or history
 * synchronization could fail, losing latest changes.
 */

#include "nsISupports.idl"

interface nsIArray;
interface nsIURI;
interface nsIVariant;
interface nsIFile;

interface nsINavHistoryContainerResultNode;
interface nsINavHistoryQueryResultNode;
interface nsINavHistoryQuery;
interface nsINavHistoryQueryOptions;
interface nsINavHistoryResult;
interface nsINavHistoryBatchCallback;

[scriptable, uuid(081452e5-be5c-4038-a5ea-f1f34cb6fd81)]
interface nsINavHistoryResultNode : nsISupports
{
  /**
   * Indentifies the parent result node in the result set. This is null for
   * top level nodes.
   */
  readonly attribute nsINavHistoryContainerResultNode parent;

  /**
   * The history-result to which this node belongs.
   */
  readonly attribute nsINavHistoryResult parentResult;

  /**
   * URI of the resource in question. For visits and URLs, this is the URL of
   * the page. For folders and queries, this is the place: URI of the
   * corresponding folder or query. This may be empty for other types of
   * objects like host containers.
   */
  readonly attribute AUTF8String uri;

  /**
   * Identifies the type of this node. This node can then be QI-ed to the
   * corresponding specialized result node interface.
   */
  const unsigned long RESULT_TYPE_URI = 0;               // nsINavHistoryResultNode
  const unsigned long RESULT_TYPE_VISIT = 1;             // nsINavHistoryVisitResultNode
  const unsigned long RESULT_TYPE_FULL_VISIT = 2;        // nsINavHistoryFullVisitResultNode
  const unsigned long RESULT_TYPE_DYNAMIC_CONTAINER = 4; // nsINavHistoryContainerResultNode
  const unsigned long RESULT_TYPE_QUERY = 5;             // nsINavHistoryQueryResultNode
  const unsigned long RESULT_TYPE_FOLDER = 6;            // nsINavHistoryQueryResultNode
  const unsigned long RESULT_TYPE_SEPARATOR = 7;         // nsINavHistoryResultNode
  const unsigned long RESULT_TYPE_FOLDER_SHORTCUT = 9;   // nsINavHistoryQueryResultNode
  readonly attribute unsigned long type;

  /**
   * Title of the web page, or of the node's query (day, host, folder, etc)
   */
  readonly attribute AUTF8String title;

  /**
   * Total number of times the URI has ever been accessed. For hosts, this
   * is the total of the children under it, NOT the total times the host has
   * been accessed (this would require an additional query, so is not given
   * by default when most of the time it is never needed).
   */
  readonly attribute unsigned long accessCount;

  /**
   * This is the time the user accessed the page.
   *
   * If this is a visit, it is the exact time that the page visit occurred.
   *
   * If this is a URI, it is the most recent time that the URI was visited.
   * Even if you ask for all URIs for a given date range long ago, this might
   * contain today's date if the URI was visited today.
   *
   * For hosts, or other node types with children, this is the most recent
   * access time for any of the children.
   *
   * For days queries this is the respective endTime - a maximum possible
   * visit time to fit in the day range.
   */
  readonly attribute PRTime time;

  /**
   * This URI can be used as an image source URI and will give you the favicon
   * for the page. It is *not* the URI of the favicon, but rather something
   * that will resolve to the actual image.
   *
   * In most cases, this is an annotation URI that will query the favicon
   * service. If the entry has no favicon, this is the chrome URI of the
   * default favicon. If the favicon originally lived in chrome, this will
   * be the original chrome URI of the icon.
   */
  readonly attribute AUTF8String icon;

  /**
   * This is the number of levels between this node and the top of the
   * hierarchy. The members of result.children have indentLevel = 0, their
   * children have indentLevel = 1, etc. The indent level of the root node is
   * set to -1.
   */
  readonly attribute long indentLevel;

  /**
   * When this item is in a bookmark folder (parent is of type folder), this is
   * the index into that folder of this node. These indices start at 0 and
   * increase in the order that they appear in the bookmark folder. For items
   * that are not in a bookmark folder, this value is -1.
   */
  readonly attribute long bookmarkIndex;

  /**
   * If the node is an item (bookmark, folder or a separator) this value is the
   * row ID of that bookmark in the database. For other nodes, this value is
   * set to -1.
   */
  readonly attribute long long itemId;

  /**
   * If the node is an item (bookmark, folder or a separator) this value is the 
   * time that the item was created. For other nodes, this value is 0.
   */
  readonly attribute PRTime dateAdded;

  /**
   * If the node is an item (bookmark, folder or a separator) this value is the 
   * time that the item was last modified. For other nodes, this value is 0.
   *
   *  @note When an item is added lastModified is set to the same value as
   *        dateAdded.
   */
  readonly attribute PRTime lastModified;

  /**
   * For uri nodes, this is a sorted list of the tags, delimited with commans,
   * for the uri represented by this node. Otherwise this is an empty string.
   */
  readonly attribute AString tags;
};


/**
 * When you request RESULT_TYPE_VISIT from query options, you will get this
 * interface for each item, which includes the session ID so that we can
 * group items from the same session together.
 */
[scriptable, uuid(8e2c5a86-b33d-4fa6-944b-559af7e95fcd)]
interface nsINavHistoryVisitResultNode : nsINavHistoryResultNode
{
  /**
   * This indicates the session ID of the * visit. This is used for session
   * grouping when a tree view is sorted by date.
   */
  readonly attribute long long sessionId;
};


/**
 * This structure will be returned when you request RESULT_TYPE_FULL_VISIT in
 * the query options. This includes uncommonly used information about each
 * visit.
 */
[scriptable, uuid(c49fd9d5-56e2-43eb-932c-f933f28cba85)]
interface nsINavHistoryFullVisitResultNode : nsINavHistoryVisitResultNode
{
  /**
   * This indicates the visit ID of the visit.
   */
  readonly attribute long long visitId;

  /**
   * This indicates the referring visit ID of the visit. The referrer should
   * have the same sessionId.
   */
  readonly attribute long long referringVisitId;

  /**
   * Indicates the transition type of the visit.
   * One of nsINavHistoryService.TRANSITION_*
   */
  readonly attribute long transitionType;
};


/**
 * Base class for container results. This includes all types of groupings.
 * Bookmark folders and places queries will be QueryResultNodes which extends
 * these items.
 */
[scriptable, uuid(55829318-0f6c-4503-8739-84231f3a6793)]
interface nsINavHistoryContainerResultNode : nsINavHistoryResultNode
{

  /**
   * Set this to allow descent into the container. When closed, attempting
   * to call getChildren or childCount will result in an error. You should
   * set this to false when you are done reading.
   *
   * For HOST and DAY groupings, doing this is free since the children have
   * been precomputed. For queries and bookmark folders, being open means they
   * will keep themselves up-to-date by listening for updates and re-querying
   * as needed.
   */
  attribute boolean containerOpen;

  /**
   * Indicates whether the container is closed, loading, or opened.  Loading
   * implies that the container has been opened asynchronously and has not yet
   * fully opened.
   */
  readonly attribute unsigned short state;
  const unsigned short STATE_CLOSED = 0;
  const unsigned short STATE_LOADING = 1;
  const unsigned short STATE_OPENED = 2;

  /**
   * This indicates whether this node "may" have children, and can be used
   * when the container is open or closed. When the container is closed, it
   * will give you an exact answer if the node can easily be populated (for
   * example, a bookmark folder). If not (for example, a complex history query),
   * it will return true. When the container is open, it will always be
   * accurate. It is intended to be used to see if we should draw the "+" next
   * to a tree item.
   */
  readonly attribute boolean hasChildren;

  /**
   * This gives you the children of the nodes. It is preferrable to use this
   * interface over the array one, since it avoids creating an nsIArray object
   * and the interface is already the correct type.
   *
   * @throws NS_ERROR_NOT_AVAILABLE if containerOpen is false.
   */
  readonly attribute unsigned long childCount;
  nsINavHistoryResultNode getChild(in unsigned long aIndex);

  /**
   * Get the index of a direct child in this container.
   *
   * @param aNode
   *        a result node.
   *
   * @return aNode's index in this container.
   * @throws NS_ERROR_NOT_AVAILABLE if containerOpen is false.
   * @throws NS_ERROR_INVALID_ARG if aNode isn't a direct child of this
   * container.
   */
  unsigned long getChildIndex(in nsINavHistoryResultNode aNode);

  /**
   * Look for a node in the container by some of its details.  Does not search
   * closed containers.
   *
   * @param aURI
   *        the node's uri attribute value
   * @param aTime
   *        the node's time attribute value.
   * @param aItemId
   *        the node's itemId attribute value.
   * @param aRecursive
   *        whether or not to search recursively.
   *
   * @throws NS_ERROR_NOT_AVAILABLE if this container is closed.
   * @return a result node that matches the given details if any, null
   *         otherwise.
   */
  nsINavHistoryResultNode findNodeByDetails(in AUTF8String aURIString,
                                            in PRTime aTime,
                                            in long long aItemId,
                                            in boolean aRecursive);

  /**
   * Returns false if this node's list of children can be modified
   * (adding or removing children, or reordering children), or true if
   * the UI should not allow the list of children to be modified.
   * This is false for bookmark folder nodes unless setFolderReadOnly() has
   * been called to override it, and true for non-folder nodes.
   */
  readonly attribute boolean childrenReadOnly;

  // --------------------------------------------------------------------------
  // Dynamic container

  /**
   * This is a string representing the dynamic container API service that is
   * responsible for this container. This throws if if the node is not a dynamic
   * container.
   */
  readonly attribute AUTF8String dynamicContainerType;

  /**
   * Appends a full visit node to this container and returns it. For the dynamic
   * container API. TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening()
   * ONLY, and only for non-bookmark-folder containers.
   *
   * @see nsINavHistoryURIResultNode for parameters.
   */
  nsINavHistoryResultNode appendURINode(
      in AUTF8String aURI, in AUTF8String aTitle, in PRUint32 aAccessCount,
      in PRTime aTime, in AUTF8String aIconURI);

  /**
   * Appends a full visit node to this container and returns it. For the dynamic
   * container API. TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening()
   * ONLY, and only for non-bookmark-folder containers.
   *
   * @see nsINavHistoryVisitResultNode for parameters.
   *
   * UNTESTED: Container API functions are commented out until we can test
   */
  /*nsINavHistoryVisitResultNode appendVisitNode(
      in AUTF8String aURI, in AUTF8String aTitle, in PRUint32 aAccessCount,
      in PRTime aTime, in AUTF8String aIconURI, in PRInt64 aSession);*/

  /**
   * Appends a full visit node to this container and returns it. For the dynamic
   * container API. TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening()
   * ONLY, and only for non-bookmark-folder containers.
   *
   * @see nsINavHistoryFullVisitResultNode for parameters.
   *
   * UNTESTED: Container API functions are commented out until we can test
   */
  /*nsINavHistoryFullVisitResultNode appendFullVisitNode(
      in AUTF8String aURI, in AUTF8String aTitle, in PRUint32 aAccessCount,
      in PRTime aTime, in AUTF8String aIconURI, in PRInt64 aSession,
      in PRInt64 aVisitId, in PRInt64 aReferringVisitId,
      in PRInt32 aTransitionType);*/

  /**
   * Appends a container node to this container and returns it. For the dynamic
   * container API. TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening()
   * ONLY, and only for non-bookmark-folder containers.
   *
   * aContainerType should be RESULT_TYPE_DYNAMIC_CONTAINER.
   * When type is dynamic container you must
   * specify a dynamic container type, otherwise, the dynamic container type must
   * be null. Use appendQueryNode and appendFolderNode for the other container
   * types.
   *
   * UNTESTED: Container API functions are commented out until we can test
   */
  /*nsINavHistoryContainerResultNode appendContainerNode(
      in AUTF8String aTitle, in AUTF8String aIconURI, in PRUint32 aContainerType,
      in AUTF8String aDynamicContainerType);*/

  /**
   * Appends a query node to this container and returns it. For the dynamic
   * container API. TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening()
   * ONLY, and only for non-bookmark-folder containers.
   *
   * Normally you should supply an empty string for IconURI and it will take
   * the default query icon for the current theme.
   *
   * UNTESTED: Container API functions are commented out until we can test
   */
  /*nsINavHistoryQueryResultNode appendQueryNode(
      in AUTF8String aQueryURI, in AUTF8String aTitle, in AUTF8String aIconURI);*/

  /**
   * Appends a bookmark folder node to this container and returns it. For the
   * dynamic container API. TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening()
   * ONLY, and only for non-bookmark-folder containers.
   *
   * All container attributes will come from the boomkarks service for this
   * folder.
   */
  nsINavHistoryContainerResultNode appendFolderNode(in PRInt64 aFolderId);

  /**
   * Clears all children of this container. For the dynamic container API.
   * TO BE CALLED FROM nsIDynamicContainer::OnContainerOpening and
   * nsIDynamicContainer::OnContainerClosed ONLY, and valid only for
   * non-bookmark-folder containers.
   *
   * UNTESTED: Container API functions are commented out until we can test
   */
  /*void clearContents();*/
};


/**
 * Used for places queries and as a base for bookmark folders.
 *
 * Note that if you request places to *not* be expanded in the options that
 * generated this node, this item will report it has no children and never try
 * to populate itself.
 */
[scriptable, uuid(ea17745a-1852-4155-a98f-d1dd1763b3df)]
interface nsINavHistoryQueryResultNode : nsINavHistoryContainerResultNode
{
  /**
   * Get the queries which build this node's children.
   * Only valid for RESULT_TYPE_QUERY nodes.
   */
  void getQueries([optional] out unsigned long queryCount,
                  [retval,array,size_is(queryCount)] out nsINavHistoryQuery queries);

  /**
   * Get the options which group this node's children.
   * Only valid for RESULT_TYPE_QUERY nodes.
   */
  readonly attribute nsINavHistoryQueryOptions queryOptions;

  /**
   * For both simple folder nodes and simple-folder-query nodes, this is set
   * to the concrete itemId of the folder. Otherwise, this is set to -1.
   */
  readonly attribute long long folderItemId;
};


/**
 * Allows clients to observe what is happening to a result as it updates itself
 * according to history and bookmark system events. Register this observer on a
 * result using nsINavHistoryResult::addObserver.
 */
[scriptable, uuid(9ea86387-6a30-4ee2-b70d-26fbb718902f)]
interface nsINavHistoryResultObserver : nsISupports
{
  /**
   * Called when 'aItem' is inserted into 'aParent' at index 'aNewIndex'.
   * The item previously at index (if any) and everything below it will have
   * been shifted down by one. The item may be a container or a leaf.
   */
  void nodeInserted(in nsINavHistoryContainerResultNode aParent,
                    in nsINavHistoryResultNode aNode,
                    in unsigned long aNewIndex);

  /**
   * Called whan 'aItem' is removed from 'aParent' at 'aOldIndex'. The item
   * may be a container or a leaf. This function will be called after the item
   * has been removed from its parent list, but before anything else (including
   * NULLing out the item's parent) has happened.
   */
  void nodeRemoved(in nsINavHistoryContainerResultNode aParent,
                   in nsINavHistoryResultNode aItem,
                   in unsigned long aOldIndex);

  /**
   * Called whan 'aItem' is moved from 'aOldParent' at 'aOldIndex' to
   * aNewParent at aNewIndex. The item may be a container or a leaf.
   *
   * XXX: at the moment, this method is called only when an item is moved
   * within the same container. When an item is moved between containers,
   * a new node is created for the item, and the itemRemoved/itemAdded methods
   * are used.
   */
  void nodeMoved(in nsINavHistoryResultNode aNode,
                 in nsINavHistoryContainerResultNode aOldParent,
                 in unsigned long aOldIndex,
                 in nsINavHistoryContainerResultNode aNewParent,
                 in unsigned long aNewIndex);

  /**
   * Called right after aNode's title has changed.
   * 
   * @param aNode
   *        a result node
   * @param aNewTitle
   *        the new title
   */
  void nodeTitleChanged(in nsINavHistoryResultNode aNode,
                        in AUTF8String aNewTitle);

  /**
   * Called right after aNode's uri property has changed.
   * 
   * @param aNode
   *        a result node
   * @param aNewURI
   *        the new uri
   */
  void nodeURIChanged(in nsINavHistoryResultNode aNode,
                      in AUTF8String aNewURI);

  /**
   * Called right after aNode's icon property has changed.
   *
   * @param aNode
   *        a result node
   *
   * @note: The new icon is accessible through aNode.icon.
   */
  void nodeIconChanged(in nsINavHistoryResultNode aNode);

  /**
   * Called right after aNode's time property or accessCount property, or both,
   * have changed.
   *
   * @param aNode
   *        a uri result node
   * @param aNewVisitDate
   *        the new visit date
   * @param aNewAccessCount
   *        the new access-count
   */
  void nodeHistoryDetailsChanged(in nsINavHistoryResultNode aNode,
                                 in PRTime aNewVisitDate,
                                 in unsigned long aNewAccessCount);

  /**
   * Called when the tags set on the uri represented by aNode have changed.
   *
   * @param aNode
   *        a uri result node
   *
   * @note: The new tags list is accessible through aNode.tags.
   */
  void nodeTagsChanged(in nsINavHistoryResultNode aNode);

  /**
   * Called right after the aNode's keyword property has changed.
   * 
   * @param aNode
   *        a uri result node
   * @param aNewKeyword
   *        the new keyword
   */
  void nodeKeywordChanged(in nsINavHistoryResultNode aNode,
                          in AUTF8String aNewKeyword);

  /**
   * Called right after an annotation of aNode's has changed (set, altered, or
   * unset).
   * 
   * @param aNode
   *        a result node
   * @param aAnnoName
   *        the name of the annotation that changed
   */
  void nodeAnnotationChanged(in nsINavHistoryResultNode aNode,
                             in AUTF8String aAnnoName);

  /**
   * Called right after aNode's dateAdded property has changed.
   *
   * @param aNode
   *        a result node
   * @param aNewValue
   *        the new value of the dateAdded property
   */
  void nodeDateAddedChanged(in nsINavHistoryResultNode aNode,
                            in PRTime aNewValue);

  /**
   * Called right after aNode's dateModified property has changed.
   *
   * @param aNode
   *        a result node
   * @param aNewValue
   *        the new value of the dateModified property
   */
  void nodeLastModifiedChanged(in nsINavHistoryResultNode aNode,
                               in PRTime aNewValue);

  /**
   * Called when an item is being replaced with another item at the exact
   * same position.
   *
   * @param aParentNode
   *        the parent node of the node which is being replaced
   * @param aOldNode
   *        the node which is being replaced
   * @param aNewNode
   *        the new node
   * @param aParentNode
   *        the index in aParentNode, at which a node is being replaced
   */
  void nodeReplaced(in nsINavHistoryContainerResultNode aParentNode,
                    in nsINavHistoryResultNode aOldNode,
                    in nsINavHistoryResultNode aNewNode,
                    in unsigned long aIndex);

  /**
   * Called after a container node went from closed to opened.
   *
   * @note  This method is DEPRECATED.  In the future only containerStateChanged
   *        will notify when a container is opened.
   *
   * @param aContainerNode
   *        the container node which was opened
   */
  void containerOpened(in nsINavHistoryContainerResultNode aContainerNode);

  /**
   * Called after a container node went from opened to closed. This will be
   * called for the topmost container that is closing, and implies that any
   * child containers have closed as well.
   *
   * @note  This method is DEPRECATED.  In the future only containerStateChanged
   *        will notify when a container is closed.
   *
   * @param aContainerNode
   *        the container node which was closed
   */
  void containerClosed(in nsINavHistoryContainerResultNode aContainerNode);

  /**
   * Called after a container changes state.
   *
   * @param aContainerNode
   *        The container that has changed state.
   * @param aOldState
   *        The state that aContainerNode has transitioned out of.
   * @param aNewState
   *        The state that aContainerNode has transitioned into.
   */
  void containerStateChanged(in nsINavHistoryContainerResultNode aContainerNode,
                             in unsigned long aOldState,
                             in unsigned long aNewState);

  /**
   * Called when something significant has happened within the container. The
   * contents of the container should be re-built.
   *
   * @param aContainerNode
   *        the container node to invalidate
   */
  void invalidateContainer(in nsINavHistoryContainerResultNode aContainerNode);

  /**
   * This is called to indicate to the UI that the sort has changed to the
   * given mode. For trees, for example, this would update the column headers
   * to reflect the sorting. For many other types of views, this won't be
   * applicable.
   *
   * @param sortingMode  One of nsINavHistoryQueryOptions.SORT_BY_* that
   *                     indicates the new sorting mode.
   *
   * This only is expected to update the sorting UI. invalidateAll() will also
   * get called if the sorting changes to update everything.
   */
  void sortingChanged(in unsigned short sortingMode);

  /**
   * This is called to indicate that a batch operation is about to start or end.
   * The observer could want to disable some events or updates during batches,
   * since multiple operations are packed in a short time.
   * For example treeviews could temporarily suppress select notifications.
   *
   * @param aToggleMode
   *        true if a batch is starting, false if it's ending.
   */
  void batching(in boolean aToggleMode);

  /**
   * Called by the result when this observer is added.
   */
  attribute nsINavHistoryResult result;
};


/**
 * TODO: Bug 517719.
 *
 * A predefined view adaptor for interfacing results with an nsITree. This
 * object will remove itself from its associated result when the tree has been
 * detached. This prevents circular references. Users should be aware of this,
 * if you want to re-use the same viewer, you will need to keep your own
 * reference to it and re-initialize it when the tree changes. If you use this
 * object, attach it to a result, never attach it to a tree, and forget about
 * it, it will leak!
 */
[scriptable, uuid(f8b518c0-1faf-11df-8a39-0800200c9a66)]
interface nsINavHistoryResultTreeViewer : nsINavHistoryResultObserver
{
  /**
   * This allows you to get at the real node for a given row index. This is
   * only valid when a tree is attached.
   */
  nsINavHistoryResultNode nodeForTreeIndex(in unsigned long aIndex);

  /**
   * Reverse of nodeForFlatIndex, returns the row index for a given result node.
   * Returns INDEX_INVISIBLE if the item is not visible (for example, its
   * parent is collapsed). This is only valid when a tree is attached. The
   * the result will always be INDEX_INVISIBLE if not.
   * 
   * Note: This sounds sort of obvious, but it got me: aNode must be a node
   *       retrieved from the same result that this viewer is for. If you 
   *       execute another query and get a node from a _different_ result, this 
   *       function will always return the index of that node in the tree that
   *       is attached to that result.
   */
  const unsigned long INDEX_INVISIBLE = 0xffffffff;
  unsigned long treeIndexForNode(in nsINavHistoryResultNode aNode);
};


/**
 * The result of a history/bookmark query.
 */
[scriptable, uuid(c2229ce3-2159-4001-859c-7013c52f7619)]
interface nsINavHistoryResult : nsISupports
{
  /**
   * Sorts all nodes recursively by the given parameter, one of
   * nsINavHistoryQueryOptions.SORT_BY_*  This will update the corresponding
   * options for this result, so that re-using the current options/queries will
   * always give you the current view.
   */
  attribute unsigned short sortingMode;

  /**
   * The annotation to use in SORT_BY_ANNOTATION_* sorting modes, set this
   * before setting the sortingMode attribute.
   */
  attribute AUTF8String sortingAnnotation;

  /**
   * Whether or not notifications on result changes are suppressed.
   * Initially set to false.
   *
   * Use this to avoid flickering and to improve performance when you
   * do temporary changes to the result structure (e.g. when searching for a
   * node recursively).
   */
  attribute boolean suppressNotifications;

  /**
   * Adds an observer for changes done in the result.
   *
   * @param aObserver
   *        a result observer.
   * @param aOwnsWeak
   *        If false, the result will keep an owning reference to the observer,
   *        which must be removed using removeObserver.
   *        If true, the result will keep a weak reference to the observer, which
   *        must implement nsISupportsWeakReference.
   *
   * @see nsINavHistoryResultObserver
   */
  void addObserver(in nsINavHistoryResultObserver aObserver, in boolean aOwnsWeak);

  /**
   * Removes an observer that was added by addObserver.
   *
   * @param aObserver
   *        a result observer that was added by addObserver.
   */
  void removeObserver(in nsINavHistoryResultObserver aObserver);

  /**
   * This is the root of the results. Remember that you need to open all
   * containers for their contents to be valid.
   *
   * When a result goes out of scope it will continue to observe changes till
   * it is cycle collected.  While the result waits to be collected it will stay
   * in memory, and continue to update itself, potentially causing unwanted
   * additional work.  When you close the root node the result will stop
   * observing changes, so it is good practice to close the root node when you
   * are done with a result, since that will avoid unwanted performance hits.
   */
  readonly attribute nsINavHistoryContainerResultNode root;
};


/**
 * Similar to nsIRDFObserver for history. Note that we don't pass the data
 * source since that is always the global history.
 *
 * DANGER! If you are in the middle of a batch transaction, there may be a
 * database transaction active. You can still access the DB, but be careful.
 */
[scriptable, uuid(c837f6ba-6ad7-4810-a425-8ce29e05d17e)]
interface nsINavHistoryObserver : nsISupports
{
  /**
   * Notifies you that a bunch of things are about to change, don't do any
   * heavy-duty processing until onEndUpdateBatch is called.
   */
  void onBeginUpdateBatch();

  /**
   * Notifies you that we are done doing a bunch of things and you should go
   * ahead and update UI, etc.
   */
  void onEndUpdateBatch();

  /**
   * Called when a resource is visited. This is called the first time a
   * resource (page, image, etc.) is seen as well as every subsequent time.
   *
   * Normally, transition types of TRANSITION_EMBED (corresponding to images in
   * a page, for example) are not displayed in history results (unless
   * includeHidden is set). Many observers can ignore _EMBED notifications
   * (which will comprise the majority of visit notifications) to save work.
   *
   * @param aVisitID        ID of the visit that was just created.
   * @param aTime           Time of the visit
   * @param aSessionID      The ID of one connected sequence of visits.
   * @param aReferringID    The ID of the visit the user came from. 0 if empty.
   * @param aTransitionType One of nsINavHistory.TRANSITION_*
   * @param aGUID           The unique ID associated with the page.
   * @param aAdded          Incremented by query nodes when the visited uri
   *                        belongs to them. If no such query exists, the 
   *                        history result creates a new query node dynamically.
   *                        It is used in places views only and can be ignored.
   */
  void onVisit(in nsIURI aURI,
               in long long aVisitID,
               in PRTime aTime,
               in long long aSessionID,
               in long long aReferringID,
               in unsigned long aTransitionType,
               in ACString aGUID,
               out unsigned long aAdded);

  /**
   * Called whenever either the "real" title or the custom title of the page
   * changed. BOTH TITLES ARE ALWAYS INCLUDED in this notification, even though
   * only one will change at a time. Often, consumers will want to display the
   * user title if it is available, and fall back to the page title (the one
   * specified in the <title> tag of the page).
   *
   * Note that there is a difference between an empty title and a NULL title.
   * An empty string means that somebody specifically set the title to be
   * nothing. NULL means nobody set it. From C++: use IsVoid() and SetIsVoid()
   * to see whether an empty string is "null" or not (it will always be an
   * empty string in either case).
   *
   * @param aURI
   *        The URI of the page.
   * @param aPageTitle
   *        The new title of the page.
   * @param aGUID
   *        The unique ID associated with the page.
   */
  void onTitleChanged(in nsIURI aURI,
                      in AString aPageTitle,
                      in ACString aGUID);

  /**
   * Removed by the user.
   */
  const unsigned short REASON_DELETED = 0;
  /**
   * Removed by automatic expiration.
   */
  const unsigned short REASON_EXPIRED = 1;

  /**
   * This page and all of its visits are about to be deleted.  Note: the page
   * may not necessarily have actually existed for this function to be called.
   *
   * @param aURI
   *        The URI being deleted.
   * @param aGUID
   *        The unique ID associated with the page.
   * @param aReason
   *        Indicates the reason for the removal.  See REASON_* constants.
   */
  void onBeforeDeleteURI(in nsIURI aURI,
                         in ACString aGUID,
                         in unsigned short aReason);

  /**
   * This page and all of its visits are being deleted. Note: the page may not
   * necessarily have actually existed for this function to be called.
   *
   * Delete notifications are only 99.99% accurate. Batch delete operations
   * must be done in two steps, so first come notifications, then a bulk
   * delete. If there is some error in the middle (for example, out of memory)
   * then you'll get a notification and it won't get deleted. There's no easy
   * way around this.
   *
   * @param aURI
   *        The URI that was deleted.
   * @param aGUID
   *        The unique ID associated with the page.
   * @param aReason
   *        Indicates the reason for the removal.  see REASON_* constants.
   */
  void onDeleteURI(in nsIURI aURI,
                   in ACString aGUID,
                   in unsigned short aReason);

  /**
   * Notification that all of history is being deleted.
   */
  void onClearHistory();

  /**
   * onPageChanged attribute indicating that favicon has been updated.
   * aNewValue parameter will be set to the new favicon URI string.
   */
  const unsigned long ATTRIBUTE_FAVICON = 3;

  /**
   * An attribute of this page changed.
   *
   * @param aURI
   *        The URI of the page on which an attribute changed.
   * @param aChangedAttribute
   *        The attribute whose value changed.  See ATTRIBUTE_* constants.
   * @param aNewValue
   *        The attribute's new value.
   * @param aGUID
   *        The unique ID associated with the page.
   */
  void onPageChanged(in nsIURI aURI,
                     in unsigned long aChangedAttribute,
                     in AString aNewValue,
                     in ACString aGUID);

  /**
   * Called when some visits of an history entry are expired.
   *
   * @param aURI
   *        The page whose visits have been expired.
   * @param aVisitTime
   *        The largest visit time in microseconds that has been expired.  We
   *        guarantee that we don't have any visit older than this date.
   * @param aGUID
   *        The unique ID associated with the page.
   *
   * @note: when all visits for a page are expired and also the full page entry
   *        is expired, you will only get an onDeleteURI notification.  If a
   *        page entry is removed, then you can be sure that we don't have
   *        anymore visits for it.
   * @param aReason
   *        Indicates the reason for the removal.  see REASON_* constants.
   */
  void onDeleteVisits(in nsIURI aURI,
                      in PRTime aVisitTime,
                      in ACString aGUID,
                      in unsigned short aReason);
};


/**
 * This object encapsulates all the query parameters you're likely to need
 * when building up history UI. All parameters are ANDed together.
 *
 * This is not intended to be a super-general query mechanism. This was designed
 * so that most queries can be done in only one SQL query. This is important
 * because, if the user has their profile on a networked drive, query latency
 * can be non-negligible.
 */

[scriptable, uuid(dc87ae79-22f1-4dcf-975b-852b01d210cb)]
interface nsINavHistoryQuery : nsISupports
{
  /**
   * Time range for results (INCLUSIVE). The *TimeReference is one of the
   * constants TIME_RELATIVE_* which indicates how to interpret the
   * corresponding time value.
   *   TIME_RELATIVE_EPOCH (default):
   *     The time is relative to Jan 1 1970 GMT, (this is a normal PRTime)
   *   TIME_RELATIVE_TODAY:
   *     The time is relative to this morning at midnight. Normally used for
   *     queries relative to today. For example, a "past week" query would be
   *     today-6 days -> today+1 day
   *   TIME_RELATIVE_NOW:
   *     The time is relative to right now.
   *
   * Note: PRTime is in MICROseconds since 1 Jan 1970. Javascript date objects
   * are expressed in MILLIseconds since 1 Jan 1970.
   *
   * As a special case, a 0 time relative to TIME_RELATIVE_EPOCH indicates that
   * the time is not part of the query. This is the default, so an empty query
   * will match any time. The has* functions return whether the corresponding
   * time is considered.
   *
   * You can read absolute*Time to get the time value that the currently loaded
   * reference points + offset resolve to.
   */
  const unsigned long TIME_RELATIVE_EPOCH = 0;
  const unsigned long TIME_RELATIVE_TODAY = 1;
  const unsigned long TIME_RELATIVE_NOW = 2;

  attribute PRTime beginTime;
  attribute unsigned long beginTimeReference;
  readonly attribute boolean hasBeginTime;
  readonly attribute PRTime absoluteBeginTime;

  attribute PRTime endTime;
  attribute unsigned long endTimeReference;
  readonly attribute boolean hasEndTime;
  readonly attribute PRTime absoluteEndTime;

  /**
   * Text search terms.
   */
  attribute AString searchTerms;
  readonly attribute boolean hasSearchTerms;

  /**
   * Set lower or upper limits for how many times an item has been
   * visited.  The default is -1, and in that case all items are
   * matched regardless of their visit count.
   */
  attribute long minVisits;
  attribute long maxVisits;

  /**
   * When the set of transitions is nonempty, results are limited to pages which
   * have at least one visit for each of the transition types.
   * @note: For searching on more than one transition this can be very slow.
   *
   * Limit results to the specified list of transition types.
   */
  void setTransitions([const,array, size_is(count)] in unsigned long transitions,
                      in unsigned long count);

  /**
   * Get the transitions set for this query.
   */
  void getTransitions([optional] out unsigned long count,
                      [retval,array,size_is(count)] out unsigned long transitions);

  /**
   * Get the count of the set query transitions.
   */
  readonly attribute unsigned long transitionCount;

  /**
   * When set, returns only bookmarked items, when unset, returns anything. Setting this
   * is equivalent to listing all bookmark folders in the 'folders' parameter.
   */
  attribute boolean onlyBookmarked;

  /**
   * This controls the meaning of 'domain', and whether it is an exact match
   * 'domainIsHost' = true, or hierarchical (= false).
   */
  attribute boolean domainIsHost;

  /**
   * This is the host or domain name (controlled by domainIsHost). When
   * domainIsHost, domain only does exact matching on host names. Otherwise,
   * it will return anything whose host name ends in 'domain'.
   *
   * This one is a little different than most. Setting it to an empty string
   * is a real query and will match any URI that has no host name (local files
   * and such). Set this to NULL (in C++ use SetIsVoid) if you don't want
   * domain matching.
   */
  attribute AUTF8String domain;
  readonly attribute boolean hasDomain;

  /**
   * Controls the interpretation of 'uri'. When unset (default), the URI will
   * request an exact match of the specified URI. When set, any history entry
   * beginning in 'uri' will match. For example "http://bar.com/foo" will match
   * "http://bar.com/foo" as well as "http://bar.com/foo/baz.gif".
   */
  attribute boolean uriIsPrefix;

  /**
   * This is a URI to match, to, for example, find out every time you visited
   * a given URI. Use uriIsPrefix to control whether this is an exact match.
   */
  attribute nsIURI uri;
  readonly attribute boolean hasUri;

  /**
   * Test for existence or non-existence of a given annotation. We don't
   * currently support >1 annotation name per query. If 'annotationIsNot' is
   * true, we test for the non-existence of the specified annotation.
   *
   * Testing for not annotation will do the same thing as a normal query and
   * remove everything that doesn't have that annotation. Asking for things
   * that DO have a given annotation is a little different. It also includes
   * things that have never been visited. This allows place queries to be
   * returned as well as anything else that may have been tagged with an
   * annotation. This will only work for RESULTS_AS_URI since there will be
   * no visits for these items.
   */
  attribute boolean annotationIsNot;
  attribute AUTF8String annotation;
  readonly attribute boolean hasAnnotation;

  /**
   * Limit results to items that are tagged with all of the given tags.  This
   * attribute must be set to an array of strings.  When called as a getter it
   * will return an array of strings sorted ascending in lexicographical order.
   * The array may be empty in either case.  Duplicate tags may be specified
   * when setting the attribute, but the getter returns only unique tags.
   *
   * To search for items that are tagged with any given tags rather than all,
   * multiple queries may be passed to nsINavHistoryService.executeQueries().
   */
  attribute nsIVariant tags;

  /**
   * If 'tagsAreNot' is true, the results are instead limited to items that
   * are not tagged with any of the given tags.  This attribute is used in
   * conjunction with the 'tags' attribute.
   */
  attribute boolean tagsAreNot;

  /**
   * Limit results to items that are in all of the given folders.
   */
  void getFolders([optional] out unsigned long count,
                  [retval,array,size_is(count)] out long long folders);
  readonly attribute unsigned long folderCount;

  /**
   * For the special result type RESULTS_AS_TAG_CONTENTS we can define only
   * one folder that must be a tag folder. This is not recursive so results
   * will be returned from the first level of that folder.
   */
  void setFolders([const,array, size_is(folderCount)] in long long folders,
                  in unsigned long folderCount);

  /**
   * Creates a new query item with the same parameters of this one.
   */
  nsINavHistoryQuery clone();
};

/**
 * This object represents the global options for executing a query.
 */
[scriptable, uuid(2d8ff86b-f8c2-451c-8a1a-1ff0749a074e)]
interface nsINavHistoryQueryOptions : nsISupports
{
  /**
   * You can ask for the results to be pre-sorted. Since the DB has indices
   * of many items, it can produce sorted results almost for free. These should
   * be self-explanatory.
   *
   * Note: re-sorting is slower, as is sorting by title or when you have a
   * host name.
   *
   * For bookmark items, SORT_BY_NONE means sort by the natural bookmark order.
   */
  const unsigned short SORT_BY_NONE = 0;
  const unsigned short SORT_BY_TITLE_ASCENDING = 1;
  const unsigned short SORT_BY_TITLE_DESCENDING = 2;
  const unsigned short SORT_BY_DATE_ASCENDING = 3;
  const unsigned short SORT_BY_DATE_DESCENDING = 4;
  const unsigned short SORT_BY_URI_ASCENDING = 5;
  const unsigned short SORT_BY_URI_DESCENDING = 6;
  const unsigned short SORT_BY_VISITCOUNT_ASCENDING = 7;
  const unsigned short SORT_BY_VISITCOUNT_DESCENDING = 8;
  const unsigned short SORT_BY_KEYWORD_ASCENDING = 9;
  const unsigned short SORT_BY_KEYWORD_DESCENDING = 10;
  const unsigned short SORT_BY_DATEADDED_ASCENDING = 11;
  const unsigned short SORT_BY_DATEADDED_DESCENDING = 12;
  const unsigned short SORT_BY_LASTMODIFIED_ASCENDING = 13;
  const unsigned short SORT_BY_LASTMODIFIED_DESCENDING = 14;
  const unsigned short SORT_BY_TAGS_ASCENDING = 17;
  const unsigned short SORT_BY_TAGS_DESCENDING = 18;
  const unsigned short SORT_BY_ANNOTATION_ASCENDING = 19;
  const unsigned short SORT_BY_ANNOTATION_DESCENDING = 20;
  const unsigned short SORT_BY_FRECENCY_ASCENDING = 21;
  const unsigned short SORT_BY_FRECENCY_DESCENDING = 22;

  /**
   * "URI" results, one for each URI visited in the range. Individual result
   * nodes will be of type "URI".
   */
  const unsigned short RESULTS_AS_URI = 0;

  /**
   * "Visit" results, with one for each time a page was visited (this will
   * often give you multiple results for one URI). Individual result nodes will
   * have type "Visit"
   *
   * @note This result type is only supported by QUERY_TYPE_HISTORY.
   */
  const unsigned short RESULTS_AS_VISIT = 1;

  /**
   * This is identical to RESULT_TYPE_VISIT except that individual result nodes
   * will have type "FullVisit".  This is used for the attributes that are not
   * commonly accessed to save space in the common case (the lists can be very
   * long).
   *
   * @note Not yet implemented. See bug 409662.
   * @note This result type is only supported by QUERY_TYPE_HISTORY.
   */
  const unsigned short RESULTS_AS_FULL_VISIT = 2;

  /**
   * This returns query nodes for each predefined date range where we 
   * had visits. The node contains information how to load its content:
   * - visits for the given date range will be loaded.
   *
   * @note This result type is only supported by QUERY_TYPE_HISTORY.
   */
  const unsigned short RESULTS_AS_DATE_QUERY = 3;

  /**
   * This returns nsINavHistoryQueryResultNode nodes for each site where we 
   * have visits. The node contains information how to load its content:
   * - last visit for each url in the given host will be loaded.
   *
   * @note This result type is only supported by QUERY_TYPE_HISTORY.
   */
  const unsigned short RESULTS_AS_SITE_QUERY = 4;

  /**
   * This returns nsINavHistoryQueryResultNode nodes for each day where we 
   * have visits. The node contains information how to load its content:
   * - list of hosts visited in the given period will be loaded.
   *
   * @note This result type is only supported by QUERY_TYPE_HISTORY.
   */
  const unsigned short RESULTS_AS_DATE_SITE_QUERY = 5;

  /**
   * This returns nsINavHistoryQueryResultNode nodes for each tag.
   * The node contains information how to load its content:
   * - list of bookmarks with the given tag will be loaded.
   *
   * @note Setting this resultType will force queryType to QUERY_TYPE_BOOKMARKS.
   */
  const unsigned short RESULTS_AS_TAG_QUERY = 6;

  /**
   * This is a container with an URI result type that contains the last
   * modified bookmarks for the given tag.
   * Tag folder id must be defined in the query.
   *
   * @note Setting this resultType will force queryType to QUERY_TYPE_BOOKMARKS.
   */
  const unsigned short RESULTS_AS_TAG_CONTENTS = 7;

  /**
   * The sorting mode to be used for this query.
   * mode is one of SORT_BY_*
   */
  attribute unsigned short sortingMode;

  /**
   * The annotation to use in SORT_BY_ANNOTATION_* sorting modes.
   */
  attribute AUTF8String sortingAnnotation;

  /**
   * Sets the result type. One of RESULT_TYPE_* which includes how URIs are
   * represented.
   */
  attribute unsigned short resultType;

  /**
   * This option excludes all URIs and separators from a bookmarks query.
   * This would be used if you just wanted a list of bookmark folders and
   * queries (such as the left pane of the places page).
   * Defaults to false.
   */
  attribute boolean excludeItems;

  /**
   * Set to true to exclude queries ("place:" URIs) from the query results.
   * Simple folder queries (bookmark folder symlinks) will still be included.
   * Defaults to false.
   */
  attribute boolean excludeQueries;

  /**
   * Set to true to exclude read-only folders from the query results. This is
   * designed for cases where you want to give the user the option of filing
   * something into a list of folders. It only affects cases where the actual
   * folder result node would appear in its parent folder and filters it out.
   * It doesn't affect the query at all, and doesn't affect more complex
   * queries (such as "folders with annotation X").
   */
  attribute boolean excludeReadOnlyFolders;

  /**
   * This option excludes items from a bookmarks query
   * if the parent of the item has this annotation.
   * An example is to exclude livemark items
   * (parent folders have the "livemark/feedURI" annotation)
   * Ignored for queries over history.
   */
  attribute AUTF8String excludeItemIfParentHasAnnotation;

  /**
   * When set, allows items with "place:" URIs to appear as containers,
   * with the container's contents filled in from the stored query.
   * If not set, these will appear as normal items. Doesn't do anything if
   * excludeQueries is set. Defaults to false.
   *
   * Note that this has no effect on folder links, which are place: URIs
   * returned by nsINavBookmarkService.GetFolderURI. These are always expanded
   * and will appear as bookmark folders.
   */
  attribute boolean expandQueries;

  /**
   * Most items in history are marked "hidden." Only toplevel pages that the
   * user sees in the URL bar are not hidden. Hidden things include the content
   * of iframes and all images on web pages. Normally, you don't want these
   * things. If you do, set this flag and you'll get all items, even hidden
   * ones. Does nothing for bookmark queries. Defaults to false.
   */
  attribute boolean includeHidden;

  /**
   * Include both redirected-from and redirected-to pages into results.
   */
  const unsigned short REDIRECTS_MODE_ALL = 0;
  /**
   * Query results will not include redirected-to pages, but will include
   * redirected-from pages.
   */
  const unsigned short REDIRECTS_MODE_SOURCE = 1;
  /**
   * Query results will not include redirected-from pages but will include
   * redirected-to pages.
   */
  const unsigned short REDIRECTS_MODE_TARGET = 2;

  /**
   * Defines how redirects should be handled, see REDIRECTS_MODE_* constants
   * above.
   * Defaults to REDIRECTS_MODE_ALL.
   * Note: this option is effective only on QUERY_TYPE_HISTORY.
   */
  attribute unsigned short redirectsMode;

  /**
   * This is the maximum number of results that you want. The query is exeucted,
   * the results are sorted, and then the top 'maxResults' results are taken
   * and returned. Set to 0 (the default) to get all results.
   *
   * THIS DOES NOT WORK IN CONJUNCTION WITH SORTING BY TITLE. This is because
   * sorting by title requires us to sort after using locale-sensetive sorting
   * (as opposed to letting the database do it for us).
   *
   * Instead, we get the result ordered by date, pick the maxResult most recent
   * ones, and THEN sort by title.
   */
  attribute unsigned long maxResults;

  const unsigned short QUERY_TYPE_HISTORY = 0;
  const unsigned short QUERY_TYPE_BOOKMARKS = 1;
  /* Unified queries are not yet implemented. See bug 378798 */
  const unsigned short QUERY_TYPE_UNIFIED = 2;

  /**
   * The type of search to use when querying the DB; This attribute is only
   * honored by query nodes. It is silently ignored for simple folder queries.
   */
  attribute unsigned short queryType;

  /**
   * When this is true, the root container node generated by these options and
   * its descendant containers will be opened asynchronously if they support it.
   * This is false by default.
   *
   * @note Currently only bookmark folder containers support being opened
   *       asynchronously.
   */
  attribute boolean asyncEnabled;

  /**
   * Creates a new options item with the same parameters of this one.
   */
  nsINavHistoryQueryOptions clone();
};

[scriptable, uuid(562e698d-04f0-4df1-bd5d-1f1e5b84d7ef)]
interface nsINavHistoryService : nsISupports
{
  /**
   * System Notifications:
   *
   * places-init-complete - Sent once the History service is completely
   *                        initialized successfully.
   * places-database-locked - Sent if initialization of the History service
   *                          failed due to the inability to open the places.sqlite
   *                          for access reasons.
   */

  /**
   * This transition type means the user followed a link and got a new toplevel
   * window.
   */
  const unsigned long TRANSITION_LINK = 1;

  /**
   * This transition type means that the user typed the page's URL in the
   * URL bar or selected it from URL bar autocomplete results, clicked on
   * it from a history query (from the History sidebar, History menu, 
   * or history query in the personal toolbar or Places organizer.
   */
  const unsigned long TRANSITION_TYPED = 2;

  /**
   * This transition is set when the user followed a bookmark to get to the
   * page.
   */
  const unsigned long TRANSITION_BOOKMARK = 3;

  /**
   * This transition type is set when some inner content is loaded. This is
   * true of all images on a page, and the contents of the iframe. It is also
   * true of any content in a frame if the user did not explicitly follow
   * a link to get there.
   */
  const unsigned long TRANSITION_EMBED = 4;

  /**
   * Set when the transition was a permanent redirect.
   */
  const unsigned long TRANSITION_REDIRECT_PERMANENT = 5;

  /**
   * Set when the transition was a temporary redirect.
   */
  const unsigned long TRANSITION_REDIRECT_TEMPORARY = 6;

  /**
   * Set when the transition is a download.
   */
  const unsigned long TRANSITION_DOWNLOAD = 7;

  /**
   * This transition type means the user followed a link and got a visit in
   * a frame.
   */
  const unsigned long TRANSITION_FRAMED_LINK = 8;

  /**
   * Set when database is coherent
   */
  const unsigned short DATABASE_STATUS_OK = 0;

  /**
   * Set when database did not exist and we created a new one
   */
  const unsigned short DATABASE_STATUS_CREATE = 1;

  /**
   * Set when database was corrupt and we replaced it
   */
  const unsigned short DATABASE_STATUS_CORRUPT = 2;

  /**
   * Set when database schema has been upgraded
   */
  const unsigned short DATABASE_STATUS_UPGRADED = 3;

  /**
   * Returns the current database status
   */
  readonly attribute unsigned short databaseStatus;

  /**
   * True if there is any history. This can be used in UI to determine whether
   * the "clear history" button should be enabled or not. This is much better
   * than using BrowserHistory.count since that can be very slow if there is
   * a lot of history (it must enumerate each item). This is pretty fast.
   */
  readonly attribute boolean hasHistoryEntries;

  /**
   * Gets the original title of the page.
   */
  AString getPageTitle(in nsIURI aURI);

  /**
   * This is just like markPageAsTyped (in nsIBrowserHistory, also implemented
   * by the history service), but for bookmarks. It declares that the given URI
   * is being opened as a result of following a bookmark. If this URI is loaded
   * soon after this message has been received, that transition will be marked
   * as following a bookmark.
   */
  void markPageAsFollowedBookmark(in nsIURI aURI);

  /**
   * Gets the stored character-set for an URI.
   *
   * @param aURI
   *        URI to retrieve character-set for
   * @return character-set, empty string if not found
   */
  AString getCharsetForURI(in nsIURI aURI);

  /**
   * Sets the character-set for an URI.
   *
   * @param aURI
   *        URI to set the character-set for
   * @param aCharset
   *        character-set to be set
   */
  void setCharsetForURI(in nsIURI aURI, in AString aCharset);

  /**
   * Returns true if this URI would be added to the history. You don't have to
   * worry about calling this, addPageToSession/addURI will always check before
   * actually adding the page. This function is public because some components
   * may want to check if this page would go in the history (i.e. for
   * annotations).
   */
  boolean canAddURI(in nsIURI aURI);

  /**
   * Call to manually add a visit for a specific page. This will probably not
   * be commonly used other than for backup/restore type operations. If the URI
   * does not have an entry in the history database already, one will be created
   * with no visits, no title, hidden, not typed.  Adding a visit will
   * automatically increment the visit count for the visited page and will unhide
   * it and/or mark it typed according to the transition type.
   *
   * @param aURI             Visited page
   * @param aTime            Time page was visited (microseconds)
   * @param aReferringURI    The URI of the visit that generated this one. Use
   *                         null for no referrer.
   * @param aTranstitionType Type of transition: one of TRANSITION_* above
   * @param aIsRedirect      True if the given visit redirects to somewhere else.
   *                         (ie you will create an visit out of here that is a
   *                         redirect transition). This causes this page to be
   *                         hidden in normal history views (unless it has been
   *                         unhidden by visiting it with a non-redirect).
   * @param aSessionID       The session ID that this page belongs to. Use 0 for
   *                         no session.
   * @return The ID of the created visit. This will be 0 if the URI cannot
   *         be added to history (canAddURI = false) or the visit is session
   *         persistent (TRANSITION_EMBED).
   */
  long long addVisit(in nsIURI aURI, in PRTime aTime,
                     in nsIURI aReferringURI, in long aTransitionType,
                     in boolean aIsRedirect, in long long aSessionID);

  /**
   * This returns a new query object that you can pass to executeQuer[y/ies].
   * It will be initialized to all empty (so using it will give you all history).
   */
  nsINavHistoryQuery getNewQuery();

  /**
   * This returns a new options object that you can pass to executeQuer[y/ies]
   * after setting the desired options.
   */
  nsINavHistoryQueryOptions getNewQueryOptions();

  /**
   * Executes a single query.
   */
  nsINavHistoryResult executeQuery(in nsINavHistoryQuery aQuery,
                                   in nsINavHistoryQueryOptions options);

  /**
   * Executes an array of queries. All of the query objects are ORed
   * together. Within a query, all the terms are ANDed together as in
   * executeQuery. See executeQuery()
   */
  nsINavHistoryResult executeQueries(
    [array,size_is(aQueryCount)] in nsINavHistoryQuery aQueries,
    in unsigned long aQueryCount,
    in nsINavHistoryQueryOptions options);

  /**
   * Converts a query URI-like string to an array of actual query objects for
   * use to executeQueries(). The output query array may be empty if there is
   * no information. However, there will always be an options structure returned
   * (if nothing is defined, it will just have the default values).
   */
  void queryStringToQueries(in AUTF8String aQueryString,
    [array, size_is(aResultCount)] out nsINavHistoryQuery aQueries,
    out unsigned long aResultCount,
    out nsINavHistoryQueryOptions options);

  /**
   * Converts a query into an equivalent string that can be persisted. Inverse
   * of queryStringToQueries()
   */
  AUTF8String queriesToQueryString(
    [array, size_is(aQueryCount)] in nsINavHistoryQuery aQueries,
    in unsigned long aQueryCount,
    in nsINavHistoryQueryOptions options);

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

  /**
   * Removes a history observer.
   */
  void removeObserver(in nsINavHistoryObserver observer);

  /**
   * Runs the passed callback in batch mode. Use this when a lot of things
   * are about to change. Calls can be nested, observers will only be
   * notified when all batches begin/end.
   *
   * @param aCallback
   *        nsINavHistoryBatchCallback interface to call.
   * @param aUserData
   *        Opaque parameter passed to nsINavBookmarksBatchCallback
   */
  void runInBatchMode(in nsINavHistoryBatchCallback aCallback,
                      in nsISupports aClosure);

  /** 
   * True if history is disabled. currently, 
   * history is disabled if the places.history.enabled pref is false.
   */
  readonly attribute boolean historyDisabled;
};

/**
 * @see runInBatchMode of nsINavHistoryService/nsINavBookmarksService
 */
[scriptable, uuid(5143f2bb-be0a-4faf-9acb-b0ed3f82952c)]
interface nsINavHistoryBatchCallback : nsISupports {
  void runBatched(in nsISupports aUserData);
};
