/* -*- 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/. */

/**
 * 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(91d104bb-17ef-404b-9f9a-d9ed8de6824c)]
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

  // Visit nodes are deprecated and unsupported.
  // This line exists just to avoid reusing the value:
  // const unsigned long RESULT_TYPE_VISIT = 1;

  // Full visit nodes are deprecated and unsupported.
  // This line exists just to avoid reusing the value:
  // const unsigned long RESULT_TYPE_FULL_VISIT = 2;

  // Dynamic containers are deprecated and unsupported.
  // This const exists just to avoid reusing the value:
  // 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;

  /**
   * The unique ID associated with the page. It my return an empty string
   * if the result node is a non-URI node.
   */
  readonly attribute ACString pageGuid;

  /**
   * The unique ID associated with the bookmark. It returns an empty string
   * if the result node is not associated with a bookmark, a folder or a
   * separator.
   */
  readonly attribute ACString bookmarkGuid;

  /**
   * The unique ID associated with the history visit. For node types other than
   * history visit nodes, this value is -1.
   */
  readonly attribute long long visitId;

  /**
   * The unique ID associated with visit node which was the referrer of this
   * history visit. For node types other than history visit nodes, or visits
   * without any known referrer, this value is -1.
   */
  readonly attribute long long fromVisitId;

  /**
   * The transition type associated with this visit. For node types other than
   * history visit nodes, this value is 0.
   */
  readonly attribute unsigned long visitType;
};


/**
 * 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(3E9CC95F-0D93-45F1-894F-908EEB9866D7)]
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);
};


/**
 * 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(62817759-4FEE-44A3-B58C-3E2F5AFC9D0A)]
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 queries and folder shortcut queries, this is set to
   * the concrete itemId of the folder (i.e. for folder shortcuts it's the
   * target folder id).  Otherwise, this is set to -1.
   */
  readonly attribute long long folderItemId;

  /**
   * For both simple folder queries and folder shortcut queries, this is set to
   * the concrete guid of the folder (i.e. for folder shortcuts it's the target
   * folder guid). Otherwise, this is set to an empty string.
   */
  readonly attribute ACString targetFolderGuid;
};


/**
 * 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(f62d8b6b-3c4e-4a9f-a897-db605d0b7a0f)]
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 old uri
   */
  void nodeURIChanged(in nsINavHistoryResultNode aNode,
                      in AUTF8String aOldURI);

  /**
   * 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 aOldVisitDate
   *        the old visit date
   * @param aOldAccessCount
   *        the old access-count
   */
  void nodeHistoryDetailsChanged(in nsINavHistoryResultNode aNode,
                                 in PRTime aOldVisitDate,
                                 in unsigned long aOldAccessCount);

  /**
   * 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 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,
                   [optional] 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(0f0f45b0-13a1-44ae-a0ab-c6046ec6d4da)]
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 everytime a URI is visited.
   *
   * @note TRANSITION_EMBED visits (corresponding to images in a page, for
   *       example) are not displayed in history results. Most observers can
   *       ignore TRANSITION_EMBED visit 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
   *        No longer supported and always set to 0.
   * @param aReferrerVisitId
   *        The id of the visit the user came from, defaults to 0 for no referrer.
   * @param aTransitionType
   *        One of nsINavHistory.TRANSITION_*
   * @param aGuid
   *        The unique id associated with the page.
   * @param aHidden
   *        Whether the visited page is marked as hidden.
   * @param aVisitCount
   *        Number of visits (included this one) for this URI.
   * @param aTyped
   *        Whether the URI has been typed or not.
   *        TODO (Bug 1271801): This will become a count, rather than a boolean.
   *        For future compatibility, always compare it with "> 0".
   * @param aLastKnownTitle
   *        The last known title of the page. Might not be from the current visit,
   *        and might be null if it is not known.
   */
  void onVisit(in nsIURI aURI,
               in long long aVisitId,
               in PRTime aTime,
               in long long aSessionId,
               in long long aReferrerVisitId,
               in unsigned long aTransitionType,
               in ACString aGuid,
               in boolean aHidden,
               in unsigned long aVisitCount,
               in unsigned long aTyped,
               in AString aLastKnownTitle);

  /**
   * 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);

  /**
   * Called when an individual page's frecency has changed.
   *
   * This is not called for pages whose frecencies change as the result of some
   * large operation where some large or unknown number of frecencies change at
   * once.  Use onManyFrecenciesChanged to detect such changes.
   *
   * @param aURI
   *        The page's URI.
   * @param aNewFrecency
   *        The page's new frecency.
   * @param aGUID
   *        The page's GUID.
   * @param aHidden
   *        True if the page is marked as hidden.
   * @param aVisitDate
   *        The page's last visit date.
   */
  void onFrecencyChanged(in nsIURI aURI,
                         in long aNewFrecency,
                         in ACString aGUID,
                         in boolean aHidden,
                         in PRTime aVisitDate);

  /**
   * Called when the frecencies of many pages have changed at once.
   *
   * onFrecencyChanged is not called for each of those pages.
   */
  void onManyFrecenciesChanged();

  /**
   * 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 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.
   * @param aTransitionType
   *        If it's a valid TRANSITION_* value, all visits of the specified type
   *        have been removed.
   */
  void onDeleteVisits(in nsIURI aURI,
                      in PRTime aVisitTime,
                      in ACString aGUID,
                      in unsigned short aReason,
                      in unsigned long aTransitionType);
};


/**
 * 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;

  /**
   * This is a URI to match, to, for example, find out every time you visited
   * a given URI. 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(8198dfa7-8061-4766-95cb-fa86b3c00a47)]
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;

  /**
   * DO NOT USE THIS API. IT'LL BE REMOVED IN BUG 1072833.
   *
   * Set to true to exclude live bookmarks from the query results.
   */
  attribute boolean excludeReadOnlyFolders;

  /**
   * 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;

  /**
   * Some pages in history are marked "hidden" and thus don't appear by default
   * in queries.  These include automatic framed visits and redirects.  Setting
   * this attribute will return all pages, even hidden ones.  Does nothing for
   * bookmark queries. Defaults to false.
   */
  attribute boolean includeHidden;

  /**
   * 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(8a1f527e-c9d7-4a51-bf0c-d86f0379b701)]
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;

  /**
   * This transition type means the page has been reloaded.
   */
  const unsigned long TRANSITION_RELOAD = 9;

  /**
   * 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 with a new one.
   */
  const unsigned short DATABASE_STATUS_CORRUPT = 2;

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

  /**
   * Set when database couldn't be opened.
   */
  const unsigned short DATABASE_STATUS_LOCKED = 4;

  /**
   * 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.
   * @deprecated use PlacesUtils.history.fetch instead.
   */
  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);

  /**
   * Designates the url as having been explicitly typed in by the user.
   *
   * @param aURI
   *        URI of the page to be marked.
   */
  void markPageAsTyped(in nsIURI aURI);

  /**
   * Designates the url as coming from a link explicitly followed by
   * the user (for example by clicking on it).
   *
   * @param aURI
   *        URI of the page to be marked.
   */
  void markPageAsFollowedLink(in nsIURI aURI);

  /**
   * Returns true if this URI would be added to the history. You don't have to
   * worry about calling this, adding a visit 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);

  /**
   * 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,
                   [optional] in boolean ownsWeak);

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

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

  /**
   * 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;

  /**
   * Clear all TRANSITION_EMBED visits.
   */
  void clearEmbedVisits();

  /**
   * Generate a guid.
   * Guids can be used for any places purposes (history, bookmarks, etc.)
   * Returns null if the generation of the guid failed.
   */
  ACString makeGuid();

  /**
   * Returns a 48-bit hash for a URI spec.
   *
   * @param aSpec
   *        The URI spec to hash.
   * @param aMode
   *        The hash mode: `""` (default), `"prefix_lo"`, or `"prefix_hi"`.
   */
  unsigned long long hashURL(in ACString aSpec, [optional] in ACString aMode);
};

/**
 * @see runInBatchMode of nsINavHistoryService/nsINavBookmarksService
 */
[scriptable, function, uuid(5a5a9154-95ac-4e3d-90df-558816297407)]
interface nsINavHistoryBatchCallback : nsISupports {
  void runBatched(in nsISupports aUserData);
};
