/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsNavBookmarks.h"

#include "nsNavHistory.h"
#include "nsAnnotationService.h"
#include "nsPlacesMacros.h"
#include "Helpers.h"

#include "nsAppDirectoryServiceDefs.h"
#include "nsNetUtil.h"
#include "nsUnicharUtils.h"
#include "nsPrintfCString.h"
#include "prprf.h"
#include "mozilla/storage.h"
#include "mozilla/FunctionTimer.h"
#include "mozilla/Util.h"

#include "sampler.h"

#define BOOKMARKS_TO_KEYWORDS_INITIAL_CACHE_SIZE 64
#define RECENT_BOOKMARKS_INITIAL_CACHE_SIZE 10
// Threashold to expire old bookmarks if the initial cache size is exceeded.
#define RECENT_BOOKMARKS_THRESHOLD PRTime((int64_t)1 * 60 * PR_USEC_PER_SEC)

#define BEGIN_CRITICAL_BOOKMARK_CACHE_SECTION(_itemId_) \
  mUncachableBookmarks.PutEntry(_itemId_); \
  mRecentBookmarksCache.RemoveEntry(_itemId_)

#define END_CRITICAL_BOOKMARK_CACHE_SECTION(_itemId_) \
  MOZ_ASSERT(!mRecentBookmarksCache.GetEntry(_itemId_)); \
  MOZ_ASSERT(mUncachableBookmarks.GetEntry(_itemId_)); \
  mUncachableBookmarks.RemoveEntry(_itemId_)

#define ADD_TO_BOOKMARK_CACHE(_itemId_, _data_) \
  PR_BEGIN_MACRO \
  ExpireNonrecentBookmarks(&mRecentBookmarksCache); \
  if (!mUncachableBookmarks.GetEntry(_itemId_)) { \
    BookmarkKeyClass* key = mRecentBookmarksCache.PutEntry(_itemId_); \
    if (key) { \
      key->bookmark = _data_; \
    } \
  } \
  PR_END_MACRO

#define TOPIC_PLACES_MAINTENANCE "places-maintenance-finished"

using namespace mozilla;

// These columns sit to the right of the kGetInfoIndex_* columns.
const int32_t nsNavBookmarks::kGetChildrenIndex_Position = 14;
const int32_t nsNavBookmarks::kGetChildrenIndex_Type = 15;
const int32_t nsNavBookmarks::kGetChildrenIndex_PlaceID = 16;
const int32_t nsNavBookmarks::kGetChildrenIndex_Guid = 17;

using namespace mozilla::places;

PLACES_FACTORY_SINGLETON_IMPLEMENTATION(nsNavBookmarks, gBookmarksService)

#define BOOKMARKS_ANNO_PREFIX "bookmarks/"
#define BOOKMARKS_TOOLBAR_FOLDER_ANNO NS_LITERAL_CSTRING(BOOKMARKS_ANNO_PREFIX "toolbarFolder")
#define READ_ONLY_ANNO NS_LITERAL_CSTRING("placesInternal/READ_ONLY")


namespace {

struct keywordSearchData
{
  int64_t itemId;
  nsString keyword;
};

PLDHashOperator
SearchBookmarkForKeyword(nsTrimInt64HashKey::KeyType aKey,
                         const nsString aValue,
                         void* aUserArg)
{
  keywordSearchData* data = reinterpret_cast<keywordSearchData*>(aUserArg);
  if (data->keyword.Equals(aValue)) {
    data->itemId = aKey;
    return PL_DHASH_STOP;
  }
  return PL_DHASH_NEXT;
}

template<typename Method, typename DataType>
class AsyncGetBookmarksForURI : public AsyncStatementCallback
{
public:
  AsyncGetBookmarksForURI(nsNavBookmarks* aBookmarksSvc,
                          Method aCallback,
                          const DataType& aData)
  : mBookmarksSvc(aBookmarksSvc)
  , mCallback(aCallback)
  , mData(aData)
  {
  }

  void Init()
  {
    nsRefPtr<Database> DB = Database::GetDatabase();
    if (DB) {
      nsCOMPtr<mozIStorageAsyncStatement> stmt = DB->GetAsyncStatement(
        "SELECT b.id, b.guid, b.parent, b.lastModified, t.guid, t.parent "
        "FROM moz_bookmarks b "
        "JOIN moz_bookmarks t on t.id = b.parent "
        "WHERE b.fk = (SELECT id FROM moz_places WHERE url = :page_url) "
        "ORDER BY b.lastModified DESC, b.id DESC "
      );
      if (stmt) {
        (void)URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"),
                              mData.bookmark.url);
        nsCOMPtr<mozIStoragePendingStatement> pendingStmt;
        (void)stmt->ExecuteAsync(this, getter_AddRefs(pendingStmt));
      }
    }
  }

  NS_IMETHOD HandleResult(mozIStorageResultSet* aResultSet)
  {
    nsCOMPtr<mozIStorageRow> row;
    while (NS_SUCCEEDED(aResultSet->GetNextRow(getter_AddRefs(row))) && row) {
      // Skip tags, for the use-cases of this async getter they are useless.
      int64_t grandParentId, tagsFolderId;
      nsresult rv = row->GetInt64(5, &grandParentId);
      NS_ENSURE_SUCCESS(rv, rv);
      rv = mBookmarksSvc->GetTagsFolder(&tagsFolderId);
      NS_ENSURE_SUCCESS(rv, rv);
      if (grandParentId == tagsFolderId) {
        continue;
      }

      mData.bookmark.grandParentId = grandParentId;
      rv = row->GetInt64(0, &mData.bookmark.id);
      NS_ENSURE_SUCCESS(rv, rv);
      rv = row->GetUTF8String(1, mData.bookmark.guid);
      NS_ENSURE_SUCCESS(rv, rv);
      rv = row->GetInt64(2, &mData.bookmark.parentId);
      NS_ENSURE_SUCCESS(rv, rv);
      // lastModified (3) should not be set for the use-cases of this getter.
      rv = row->GetUTF8String(4, mData.bookmark.parentGuid);
      NS_ENSURE_SUCCESS(rv, rv);

      if (mCallback) {
        ((*mBookmarksSvc).*mCallback)(mData);
      }
    }
    return NS_OK;
  }

private:
  nsRefPtr<nsNavBookmarks> mBookmarksSvc;
  Method mCallback;
  DataType mData;
};

static PLDHashOperator
ExpireNonrecentBookmarksCallback(BookmarkKeyClass* aKey,
                                 void* userArg)
{
  int64_t* threshold = reinterpret_cast<int64_t*>(userArg);
  if (aKey->creationTime < *threshold) {
    return PL_DHASH_REMOVE;
  }
  return PL_DHASH_NEXT;
}

static void
ExpireNonrecentBookmarks(nsTHashtable<BookmarkKeyClass>* hashTable)
{
  if (hashTable->Count() > RECENT_BOOKMARKS_INITIAL_CACHE_SIZE) {
    int64_t threshold = PR_Now() - RECENT_BOOKMARKS_THRESHOLD;
    (void)hashTable->EnumerateEntries(ExpireNonrecentBookmarksCallback,
                                      reinterpret_cast<void*>(&threshold));
  }
}

static PLDHashOperator
ExpireRecentBookmarksByParentCallback(BookmarkKeyClass* aKey,
                                      void* userArg)
{
  int64_t* parentId = reinterpret_cast<int64_t*>(userArg);
  if (aKey->bookmark.parentId == *parentId) {
    return PL_DHASH_REMOVE;
  }
  return PL_DHASH_NEXT;
}

static void
ExpireRecentBookmarksByParent(nsTHashtable<BookmarkKeyClass>* hashTable,
                              int64_t aParentId)
{
  (void)hashTable->EnumerateEntries(ExpireRecentBookmarksByParentCallback,
                                    reinterpret_cast<void*>(&aParentId));
}

} // Anonymous namespace.


nsNavBookmarks::nsNavBookmarks() : mItemCount(0)
                                 , mRoot(0)
                                 , mMenuRoot(0)
                                 , mTagsRoot(0)
                                 , mUnfiledRoot(0)
                                 , mToolbarRoot(0)
                                 , mCanNotify(false)
                                 , mCacheObservers("bookmark-observers")
                                 , mBatching(false)
{
  NS_ASSERTION(!gBookmarksService,
               "Attempting to create two instances of the service!");
  gBookmarksService = this;
}


nsNavBookmarks::~nsNavBookmarks()
{
  NS_ASSERTION(gBookmarksService == this,
               "Deleting a non-singleton instance of the service");
  if (gBookmarksService == this)
    gBookmarksService = nullptr;
}


NS_IMPL_ISUPPORTS5(nsNavBookmarks
, nsINavBookmarksService
, nsINavHistoryObserver
, nsIAnnotationObserver
, nsIObserver
, nsISupportsWeakReference
)


nsresult
nsNavBookmarks::Init()
{
  NS_TIME_FUNCTION;

  mDB = Database::GetDatabase();
  NS_ENSURE_STATE(mDB);

  mRecentBookmarksCache.Init(RECENT_BOOKMARKS_INITIAL_CACHE_SIZE);
  mUncachableBookmarks.Init(RECENT_BOOKMARKS_INITIAL_CACHE_SIZE);

  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
  if (os) {
    (void)os->AddObserver(this, TOPIC_PLACES_MAINTENANCE, true);
    (void)os->AddObserver(this, TOPIC_PLACES_SHUTDOWN, true);
    (void)os->AddObserver(this, TOPIC_PLACES_CONNECTION_CLOSED, true);
  }

  nsresult rv = ReadRoots();
  NS_ENSURE_SUCCESS(rv, rv);

  mCanNotify = true;

  // Observe annotations.
  nsAnnotationService* annosvc = nsAnnotationService::GetAnnotationService();
  NS_ENSURE_TRUE(annosvc, NS_ERROR_OUT_OF_MEMORY);
  annosvc->AddObserver(this);

  // Allows us to notify on title changes. MUST BE LAST so it is impossible
  // to fail after this call, or the history service will have a reference to
  // us and we won't go away.
  nsNavHistory* history = nsNavHistory::GetHistoryService();
  NS_ENSURE_STATE(history);
  history->AddObserver(this, true);

  // DO NOT PUT STUFF HERE that can fail. See observer comment above.

  return NS_OK;
}

nsresult
nsNavBookmarks::ReadRoots()
{
  nsCOMPtr<mozIStorageStatement> stmt;
  nsresult rv = mDB->MainConn()->CreateStatement(NS_LITERAL_CSTRING(
    "SELECT root_name, folder_id FROM moz_bookmarks_roots"
  ), getter_AddRefs(stmt));
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasResult;
  while (NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
    nsCAutoString rootName;
    rv = stmt->GetUTF8String(0, rootName);
    NS_ENSURE_SUCCESS(rv, rv);
    int64_t rootId;
    rv = stmt->GetInt64(1, &rootId);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ABORT_IF_FALSE(rootId != 0, "Root id is 0, that is an invalid value.");

    if (rootName.EqualsLiteral("places")) {
      mRoot = rootId;
    }
    else if (rootName.EqualsLiteral("menu")) {
      mMenuRoot = rootId;
    }
    else if (rootName.EqualsLiteral("toolbar")) {
      mToolbarRoot = rootId;
    }
    else if (rootName.EqualsLiteral("tags")) {
      mTagsRoot = rootId;
    }
    else if (rootName.EqualsLiteral("unfiled")) {
      mUnfiledRoot = rootId;
    }
  }

  if (!mRoot || !mMenuRoot || !mToolbarRoot || !mTagsRoot || !mUnfiledRoot)
    return NS_ERROR_FAILURE;

  return NS_OK;
}

// nsNavBookmarks::IsBookmarkedInDatabase
//
//    This checks to see if the specified place_id is actually bookmarked.

nsresult
nsNavBookmarks::IsBookmarkedInDatabase(int64_t aPlaceId,
                                       bool* aIsBookmarked)
{
  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT 1 FROM moz_bookmarks WHERE fk = :page_id"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("page_id"), aPlaceId);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->ExecuteStep(aIsBookmarked);
  NS_ENSURE_SUCCESS(rv, rv);
  return NS_OK;
}


nsresult
nsNavBookmarks::AdjustIndices(int64_t aFolderId,
                              int32_t aStartIndex,
                              int32_t aEndIndex,
                              int32_t aDelta)
{
  NS_ASSERTION(aStartIndex >= 0 && aEndIndex <= PR_INT32_MAX &&
               aStartIndex <= aEndIndex, "Bad indices");

  // Expire all cached items for this parent, since all positions are going to
  // change.
  ExpireRecentBookmarksByParent(&mRecentBookmarksCache, aFolderId);

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "UPDATE moz_bookmarks SET position = position + :delta "
      "WHERE parent = :parent "
        "AND position BETWEEN :from_index AND :to_index"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("delta"), aDelta);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("from_index"), aStartIndex);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("to_index"), aEndIndex);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);
 
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetPlacesRoot(int64_t* aRoot)
{
  *aRoot = mRoot;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetBookmarksMenuFolder(int64_t* aRoot)
{
  *aRoot = mMenuRoot;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetToolbarFolder(int64_t* aFolderId)
{
  *aFolderId = mToolbarRoot;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetTagsFolder(int64_t* aRoot)
{
  *aRoot = mTagsRoot;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetUnfiledBookmarksFolder(int64_t* aRoot)
{
  *aRoot = mUnfiledRoot;
  return NS_OK;
}


nsresult
nsNavBookmarks::InsertBookmarkInDB(int64_t aPlaceId,
                                   enum ItemType aItemType,
                                   int64_t aParentId,
                                   int32_t aIndex,
                                   const nsACString& aTitle,
                                   PRTime aDateAdded,
                                   PRTime aLastModified,
                                   const nsACString& aParentGuid,
                                   int64_t aGrandParentId,
                                   nsIURI* aURI,
                                   int64_t* _itemId,
                                   nsACString& _guid)
{
  // Check for a valid itemId.
  MOZ_ASSERT(_itemId && (*_itemId == -1 || *_itemId > 0));
  // Check for a valid placeId.
  MOZ_ASSERT(aPlaceId && (aPlaceId == -1 || aPlaceId > 0));

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "INSERT INTO moz_bookmarks "
      "(id, fk, type, parent, position, title, "
       "dateAdded, lastModified, guid) "
    "VALUES (:item_id, :page_id, :item_type, :parent, :item_index, "
            ":item_title, :date_added, :last_modified, "
            "GENERATE_GUID())"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv;
  if (*_itemId != -1)
    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), *_itemId);
  else
    rv = stmt->BindNullByName(NS_LITERAL_CSTRING("item_id"));
  NS_ENSURE_SUCCESS(rv, rv);

  if (aPlaceId != -1)
    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("page_id"), aPlaceId);
  else
    rv = stmt->BindNullByName(NS_LITERAL_CSTRING("page_id"));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("item_type"), aItemType);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aParentId);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("item_index"), aIndex);
  NS_ENSURE_SUCCESS(rv, rv);

  // Support NULL titles.
  if (aTitle.IsVoid())
    rv = stmt->BindNullByName(NS_LITERAL_CSTRING("item_title"));
  else
    rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("item_title"), aTitle);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("date_added"), aDateAdded);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aLastModified) {
    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("last_modified"),
                               aLastModified);
  }
  else {
    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("last_modified"), aDateAdded);
  }
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  if (*_itemId == -1) {
    // Get the newly inserted item id and GUID.
    nsCOMPtr<mozIStorageStatement> lastInsertIdStmt = mDB->GetStatement(
      "SELECT id, guid "
      "FROM moz_bookmarks "
      "ORDER BY ROWID DESC "
      "LIMIT 1"
    );
    NS_ENSURE_STATE(lastInsertIdStmt);
    mozStorageStatementScoper lastInsertIdScoper(lastInsertIdStmt);

    bool hasResult;
    rv = lastInsertIdStmt->ExecuteStep(&hasResult);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_TRUE(hasResult, NS_ERROR_UNEXPECTED);
    rv = lastInsertIdStmt->GetInt64(0, _itemId);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = lastInsertIdStmt->GetUTF8String(1, _guid);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (aParentId > 0) {
    // Update last modified date of the ancestors.
    // TODO (bug 408991): Doing this for all ancestors would be slow without a
    //                    nested tree, so for now update only the parent.
    rv = SetItemDateInternal(LAST_MODIFIED, aParentId, aDateAdded);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Add a cache entry since we know everything about this bookmark.
  BookmarkData bookmark;
  bookmark.id = *_itemId;
  bookmark.guid.Assign(_guid);
  if (aTitle.IsVoid()) {
    bookmark.title.SetIsVoid(true);
  }
  else {
    bookmark.title.Assign(aTitle);
  }
  bookmark.position = aIndex;
  bookmark.placeId = aPlaceId;
  bookmark.parentId = aParentId;
  bookmark.type = aItemType;
  bookmark.dateAdded = aDateAdded;
  if (aLastModified)
    bookmark.lastModified = aLastModified;
  else
    bookmark.lastModified = aDateAdded;
  if (aURI) {
    rv = aURI->GetSpec(bookmark.url);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  bookmark.parentGuid = aParentGuid;
  bookmark.grandParentId = aGrandParentId;

  ADD_TO_BOOKMARK_CACHE(*_itemId, bookmark);

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::InsertBookmark(int64_t aFolder,
                               nsIURI* aURI,
                               int32_t aIndex,
                               const nsACString& aTitle,
                               int64_t* aNewBookmarkId)
{
  NS_ENSURE_ARG(aURI);
  NS_ENSURE_ARG_POINTER(aNewBookmarkId);
  NS_ENSURE_ARG_MIN(aIndex, nsINavBookmarksService::DEFAULT_INDEX);

  mozStorageTransaction transaction(mDB->MainConn(), false);

  nsNavHistory* history = nsNavHistory::GetHistoryService();
  NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
  int64_t placeId;
  nsCAutoString placeGuid;
  nsresult rv = history->GetOrCreateIdForPage(aURI, &placeId, placeGuid);
  NS_ENSURE_SUCCESS(rv, rv);

  // Get the correct index for insertion.  This also ensures the parent exists.
  int32_t index, folderCount;
  int64_t grandParentId;
  nsCAutoString folderGuid;
  rv = FetchFolderInfo(aFolder, &folderCount, folderGuid, &grandParentId);
  NS_ENSURE_SUCCESS(rv, rv);
  if (aIndex == nsINavBookmarksService::DEFAULT_INDEX ||
      aIndex >= folderCount) {
    index = folderCount;
  }
  else {
    index = aIndex;
    // Create space for the insertion.
    rv = AdjustIndices(aFolder, index, PR_INT32_MAX, 1);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  *aNewBookmarkId = -1;
  PRTime dateAdded = PR_Now();
  nsCAutoString guid;
  nsCString title;
  TruncateTitle(aTitle, title);

  rv = InsertBookmarkInDB(placeId, BOOKMARK, aFolder, index, title, dateAdded,
                          0, folderGuid, grandParentId, aURI,
                          aNewBookmarkId, guid);
  NS_ENSURE_SUCCESS(rv, rv);

  // If not a tag, recalculate frecency for this entry, since it changed.
  if (grandParentId != mTagsRoot) {
    rv = history->UpdateFrecency(placeId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemAdded(*aNewBookmarkId, aFolder, index, TYPE_BOOKMARK,
                               aURI, title, dateAdded, guid, folderGuid));

  // If the bookmark has been added to a tag container, notify all
  // bookmark-folder result nodes which contain a bookmark for the new
  // bookmark's url.
  if (grandParentId == mTagsRoot) {
    // Notify a tags change to all bookmarks for this URI.
    nsTArray<BookmarkData> bookmarks;
    rv = GetBookmarksForURI(aURI, bookmarks);
    NS_ENSURE_SUCCESS(rv, rv);

    for (uint32_t i = 0; i < bookmarks.Length(); ++i) {
      // Check that bookmarks doesn't include the current tag itemId.
      MOZ_ASSERT(bookmarks[i].id != *aNewBookmarkId);

      NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                       nsINavBookmarkObserver,
                       OnItemChanged(bookmarks[i].id,
                                     NS_LITERAL_CSTRING("tags"),
                                     false,
                                     EmptyCString(),
                                     bookmarks[i].lastModified,
                                     TYPE_BOOKMARK,
                                     bookmarks[i].parentId,
                                     bookmarks[i].guid,
                                     bookmarks[i].parentGuid));
    }
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::RemoveItem(int64_t aItemId)
{
  SAMPLE_LABEL("bookmarks", "RemoveItem");
  NS_ENSURE_ARG(!IsRoot(aItemId));

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnBeforeItemRemoved(bookmark.id,
                                       bookmark.type,
                                       bookmark.parentId,
                                       bookmark.guid,
                                       bookmark.parentGuid));

  mozStorageTransaction transaction(mDB->MainConn(), false);

  // First, if not a tag, remove item annotations.
  if (bookmark.parentId != mTagsRoot &&
      bookmark.grandParentId != mTagsRoot) {
    nsAnnotationService* annosvc = nsAnnotationService::GetAnnotationService();
    NS_ENSURE_TRUE(annosvc, NS_ERROR_OUT_OF_MEMORY);
    rv = annosvc->RemoveItemAnnotations(bookmark.id);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (bookmark.type == TYPE_FOLDER) {
    // Remove all of the folder's children.
    rv = RemoveFolderChildren(bookmark.id);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  BEGIN_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "DELETE FROM moz_bookmarks WHERE id = :item_id"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), bookmark.id);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  // Fix indices in the parent.
  if (bookmark.position != DEFAULT_INDEX) {
    rv = AdjustIndices(bookmark.parentId,
                       bookmark.position + 1, PR_INT32_MAX, -1);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  bookmark.lastModified = PR_Now();
  rv = SetItemDateInternal(LAST_MODIFIED, bookmark.parentId,
                           bookmark.lastModified);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  END_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  nsCOMPtr<nsIURI> uri;
  if (bookmark.type == TYPE_BOOKMARK) {
    // If not a tag, recalculate frecency for this entry, since it changed.
    if (bookmark.grandParentId != mTagsRoot) {
      nsNavHistory* history = nsNavHistory::GetHistoryService();
      NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
      rv = history->UpdateFrecency(bookmark.placeId);
      NS_ENSURE_SUCCESS(rv, rv);
    }

    rv = UpdateKeywordsHashForRemovedBookmark(aItemId);
    NS_ENSURE_SUCCESS(rv, rv);

    // A broken url should not interrupt the removal process.
    (void)NS_NewURI(getter_AddRefs(uri), bookmark.url);
  }

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemRemoved(bookmark.id,
                                 bookmark.parentId,
                                 bookmark.position,
                                 bookmark.type,
                                 uri,
                                 bookmark.guid,
                                 bookmark.parentGuid));

  if (bookmark.type == TYPE_BOOKMARK && bookmark.grandParentId == mTagsRoot &&
      uri) {
    // If the removed bookmark was child of a tag container, notify a tags
    // change to all bookmarks for this URI.
    nsTArray<BookmarkData> bookmarks;
    rv = GetBookmarksForURI(uri, bookmarks);
    NS_ENSURE_SUCCESS(rv, rv);

    for (uint32_t i = 0; i < bookmarks.Length(); ++i) {
      NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                       nsINavBookmarkObserver,
                       OnItemChanged(bookmarks[i].id,
                                     NS_LITERAL_CSTRING("tags"),
                                     false,
                                     EmptyCString(),
                                     bookmarks[i].lastModified,
                                     TYPE_BOOKMARK,
                                     bookmarks[i].parentId,
                                     bookmarks[i].guid,
                                     bookmarks[i].parentGuid));
    }

  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::CreateFolder(int64_t aParent, const nsACString& aName,
                             int32_t aIndex, int64_t* aNewFolder)
{
  // NOTE: aParent can be null for root creation, so not checked
  NS_ENSURE_ARG_POINTER(aNewFolder);

  // CreateContainerWithID returns the index of the new folder, but that's not
  // used here.  To avoid any risk of corrupting data should this function
  // be changed, we'll use a local variable to hold it.  The true argument
  // will cause notifications to be sent to bookmark observers.
  int32_t localIndex = aIndex;
  nsresult rv = CreateContainerWithID(-1, aParent, aName, true, &localIndex,
                                      aNewFolder);
  NS_ENSURE_SUCCESS(rv, rv);
  return NS_OK;
}

NS_IMETHODIMP
nsNavBookmarks::GetFolderReadonly(int64_t aFolder, bool* aResult)
{
  NS_ENSURE_ARG_MIN(aFolder, 1);
  NS_ENSURE_ARG_POINTER(aResult);

  nsAnnotationService* annosvc = nsAnnotationService::GetAnnotationService();
  NS_ENSURE_TRUE(annosvc, NS_ERROR_OUT_OF_MEMORY);
  nsresult rv = annosvc->ItemHasAnnotation(aFolder, READ_ONLY_ANNO, aResult);
  NS_ENSURE_SUCCESS(rv, rv);
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::SetFolderReadonly(int64_t aFolder, bool aReadOnly)
{
  NS_ENSURE_ARG_MIN(aFolder, 1);

  nsAnnotationService* annosvc = nsAnnotationService::GetAnnotationService();
  NS_ENSURE_TRUE(annosvc, NS_ERROR_OUT_OF_MEMORY);
  nsresult rv;
  if (aReadOnly) {
    rv = annosvc->SetItemAnnotationInt32(aFolder, READ_ONLY_ANNO, 1, 0,
                                         nsAnnotationService::EXPIRE_NEVER);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  else {
    bool hasAnno;
    rv = annosvc->ItemHasAnnotation(aFolder, READ_ONLY_ANNO, &hasAnno);
    NS_ENSURE_SUCCESS(rv, rv);
    if (hasAnno) {
      rv = annosvc->RemoveItemAnnotation(aFolder, READ_ONLY_ANNO);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }
  return NS_OK;
}


nsresult
nsNavBookmarks::CreateContainerWithID(int64_t aItemId,
                                      int64_t aParent,
                                      const nsACString& aTitle,
                                      bool aIsBookmarkFolder,
                                      int32_t* aIndex,
                                      int64_t* aNewFolder)
{
  NS_ENSURE_ARG_MIN(*aIndex, nsINavBookmarksService::DEFAULT_INDEX);

  // Get the correct index for insertion.  This also ensures the parent exists.
  int32_t index, folderCount;
  int64_t grandParentId;
  nsCAutoString folderGuid;
  nsresult rv = FetchFolderInfo(aParent, &folderCount, folderGuid, &grandParentId);
  NS_ENSURE_SUCCESS(rv, rv);

  mozStorageTransaction transaction(mDB->MainConn(), false);

  if (*aIndex == nsINavBookmarksService::DEFAULT_INDEX ||
      *aIndex >= folderCount) {
    index = folderCount;
  } else {
    index = *aIndex;
    // Create space for the insertion.
    rv = AdjustIndices(aParent, index, PR_INT32_MAX, 1);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  *aNewFolder = aItemId;
  PRTime dateAdded = PR_Now();
  nsCAutoString guid;
  nsCString title;
  TruncateTitle(aTitle, title);

  rv = InsertBookmarkInDB(-1, FOLDER, aParent, index,
                          title, dateAdded, 0, folderGuid, grandParentId,
                          nullptr, aNewFolder, guid);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemAdded(*aNewFolder, aParent, index, FOLDER,
                               nullptr, title, dateAdded, guid, folderGuid));

  *aIndex = index;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::InsertSeparator(int64_t aParent,
                                int32_t aIndex,
                                int64_t* aNewItemId)
{
  NS_ENSURE_ARG_MIN(aParent, 1);
  NS_ENSURE_ARG_MIN(aIndex, nsINavBookmarksService::DEFAULT_INDEX);
  NS_ENSURE_ARG_POINTER(aNewItemId);

  // Get the correct index for insertion.  This also ensures the parent exists.
  int32_t index, folderCount;
  int64_t grandParentId;
  nsCAutoString folderGuid;
  nsresult rv = FetchFolderInfo(aParent, &folderCount, folderGuid, &grandParentId);
  NS_ENSURE_SUCCESS(rv, rv);

  mozStorageTransaction transaction(mDB->MainConn(), false);

  if (aIndex == nsINavBookmarksService::DEFAULT_INDEX ||
      aIndex >= folderCount) {
    index = folderCount;
  }
  else {
    index = aIndex;
    // Create space for the insertion.
    rv = AdjustIndices(aParent, index, PR_INT32_MAX, 1);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  *aNewItemId = -1;
  // Set a NULL title rather than an empty string.
  nsCString voidString;
  voidString.SetIsVoid(true);
  nsCAutoString guid;
  PRTime dateAdded = PR_Now();
  rv = InsertBookmarkInDB(-1, SEPARATOR, aParent, index, voidString, dateAdded,
                          0, folderGuid, grandParentId, nullptr,
                          aNewItemId, guid);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemAdded(*aNewItemId, aParent, index, TYPE_SEPARATOR,
                               nullptr, voidString, dateAdded, guid, folderGuid));

  return NS_OK;
}


nsresult
nsNavBookmarks::GetLastChildId(int64_t aFolderId, int64_t* aItemId)
{
  NS_ASSERTION(aFolderId > 0, "Invalid folder id");
  *aItemId = -1;

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT id FROM moz_bookmarks WHERE parent = :parent "
    "ORDER BY position DESC LIMIT 1"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
  NS_ENSURE_SUCCESS(rv, rv);
  bool found;
  rv = stmt->ExecuteStep(&found);
  NS_ENSURE_SUCCESS(rv, rv);
  if (found) {
    rv = stmt->GetInt64(0, aItemId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetIdForItemAt(int64_t aFolder,
                               int32_t aIndex,
                               int64_t* aItemId)
{
  NS_ENSURE_ARG_MIN(aFolder, 1);
  NS_ENSURE_ARG_POINTER(aItemId);

  *aItemId = -1;

  nsresult rv;
  if (aIndex == nsINavBookmarksService::DEFAULT_INDEX) {
    // Get last item within aFolder.
    rv = GetLastChildId(aFolder, aItemId);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  else {
    // Get the item in aFolder with position aIndex.
    nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
      "SELECT id, fk, type FROM moz_bookmarks "
      "WHERE parent = :parent AND position = :item_index"
    );
    NS_ENSURE_STATE(stmt);
    mozStorageStatementScoper scoper(stmt);

    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolder);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("item_index"), aIndex);
    NS_ENSURE_SUCCESS(rv, rv);

    bool found;
    rv = stmt->ExecuteStep(&found);
    NS_ENSURE_SUCCESS(rv, rv);
    if (found) {
      rv = stmt->GetInt64(0, aItemId);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }
  return NS_OK;
}

NS_IMPL_ISUPPORTS1(nsNavBookmarks::RemoveFolderTransaction, nsITransaction)

NS_IMETHODIMP
nsNavBookmarks::GetRemoveFolderTransaction(int64_t aFolderId, nsITransaction** aResult)
{
  NS_ENSURE_ARG_MIN(aFolderId, 1);
  NS_ENSURE_ARG_POINTER(aResult);

  // Create and initialize a RemoveFolderTransaction object that can be used to
  // recreate the folder safely later. 

  RemoveFolderTransaction* rft = 
    new RemoveFolderTransaction(aFolderId);
  if (!rft)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aResult = rft);
  return NS_OK;
}


nsresult
nsNavBookmarks::GetDescendantFolders(int64_t aFolderId,
                                     nsTArray<int64_t>& aDescendantFoldersArray) {
  nsresult rv;
  // New descendant folders will be added from this index on.
  uint32_t startIndex = aDescendantFoldersArray.Length();
  {
    nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
      "SELECT id "
      "FROM moz_bookmarks "
      "WHERE parent = :parent "
      "AND type = :item_type "
    );
    NS_ENSURE_STATE(stmt);
    mozStorageStatementScoper scoper(stmt);

    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("item_type"), TYPE_FOLDER);
    NS_ENSURE_SUCCESS(rv, rv);

    bool hasMore = false;
    while (NS_SUCCEEDED(stmt->ExecuteStep(&hasMore)) && hasMore) {
      int64_t itemId;
      rv = stmt->GetInt64(0, &itemId);
      NS_ENSURE_SUCCESS(rv, rv);
      aDescendantFoldersArray.AppendElement(itemId);
    }
  }

  // Recursively call GetDescendantFolders for added folders.
  // We start at startIndex since previous folders are checked
  // by previous calls to this method.
  uint32_t childCount = aDescendantFoldersArray.Length();
  for (uint32_t i = startIndex; i < childCount; ++i) {
    GetDescendantFolders(aDescendantFoldersArray[i], aDescendantFoldersArray);
  }

  return NS_OK;
}


nsresult
nsNavBookmarks::GetDescendantChildren(int64_t aFolderId,
                                      const nsACString& aFolderGuid,
                                      int64_t aGrandParentId,
                                      nsTArray<BookmarkData>& aFolderChildrenArray) {
  // New children will be added from this index on.
  uint32_t startIndex = aFolderChildrenArray.Length();
  nsresult rv;
  {
    // Collect children informations.
    // Select all children of a given folder, sorted by position.
    // This is a LEFT JOIN because not all bookmarks types have a place.
    // We construct a result where the first columns exactly match
    // kGetInfoIndex_* order, and additionally contains columns for position,
    // item_child, and folder_child from moz_bookmarks.
    nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
      "SELECT h.id, h.url, IFNULL(b.title, h.title), h.rev_host, h.visit_count, "
             "h.last_visit_date, f.url, null, b.id, b.dateAdded, b.lastModified, "
             "b.parent, null, h.frecency, b.position, b.type, b.fk, b.guid "
      "FROM moz_bookmarks b "
      "LEFT JOIN moz_places h ON b.fk = h.id "
      "LEFT JOIN moz_favicons f ON h.favicon_id = f.id "
      "WHERE b.parent = :parent "
      "ORDER BY b.position ASC"
    );
    NS_ENSURE_STATE(stmt);
    mozStorageStatementScoper scoper(stmt);

    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
    NS_ENSURE_SUCCESS(rv, rv);

    bool hasMore;
    while (NS_SUCCEEDED(stmt->ExecuteStep(&hasMore)) && hasMore) {
      BookmarkData child;
      rv = stmt->GetInt64(nsNavHistory::kGetInfoIndex_ItemId, &child.id);
      NS_ENSURE_SUCCESS(rv, rv);
      child.parentId = aFolderId;
      child.grandParentId = aGrandParentId;
      child.parentGuid = aFolderGuid;
      rv = stmt->GetInt32(kGetChildrenIndex_Type, &child.type);
      NS_ENSURE_SUCCESS(rv, rv);
      rv = stmt->GetInt64(kGetChildrenIndex_PlaceID, &child.placeId);
      NS_ENSURE_SUCCESS(rv, rv);
      rv = stmt->GetInt32(kGetChildrenIndex_Position, &child.position);
      NS_ENSURE_SUCCESS(rv, rv);
      rv = stmt->GetUTF8String(kGetChildrenIndex_Guid, child.guid);
      NS_ENSURE_SUCCESS(rv, rv);

      if (child.type == TYPE_BOOKMARK) {
        rv = stmt->GetUTF8String(nsNavHistory::kGetInfoIndex_URL, child.url);
        NS_ENSURE_SUCCESS(rv, rv);
      }

      // Append item to children's array.
      aFolderChildrenArray.AppendElement(child);
    }
  }

  // Recursively call GetDescendantChildren for added folders.
  // We start at startIndex since previous folders are checked
  // by previous calls to this method.
  uint32_t childCount = aFolderChildrenArray.Length();
  for (uint32_t i = startIndex; i < childCount; ++i) {
    if (aFolderChildrenArray[i].type == TYPE_FOLDER) {
      // nsTarray assumes that all children can be memmove()d, thus we can't
      // just pass aFolderChildrenArray[i].guid to a method that will change
      // the array itself.  Otherwise, since it's passed by reference, after a
      // memmove() it could point to garbage and cause intermittent crashes.
      nsCString guid = aFolderChildrenArray[i].guid;
      GetDescendantChildren(aFolderChildrenArray[i].id,
                            guid,
                            aFolderId,
                            aFolderChildrenArray);
    }
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::RemoveFolderChildren(int64_t aFolderId)
{
  SAMPLE_LABEL("bookmarks", "RemoveFolderChilder");
  NS_ENSURE_ARG_MIN(aFolderId, 1);
  NS_ENSURE_ARG(aFolderId != mRoot);

  BookmarkData folder;
  nsresult rv = FetchItemInfo(aFolderId, folder);
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_ARG(folder.type == TYPE_FOLDER);

  // Fill folder children array recursively.
  nsTArray<BookmarkData> folderChildrenArray;
  rv = GetDescendantChildren(folder.id, folder.guid, folder.parentId,
                             folderChildrenArray);
  NS_ENSURE_SUCCESS(rv, rv);

  // Build a string of folders whose children will be removed.
  nsCString foldersToRemove;
  for (uint32_t i = 0; i < folderChildrenArray.Length(); ++i) {
    BookmarkData& child = folderChildrenArray[i];

    // Notify observers that we are about to remove this child.
    NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                     nsINavBookmarkObserver,
                     OnBeforeItemRemoved(child.id,
                                         child.type,
                                         child.parentId,
                                         child.guid,
                                         child.parentGuid));

    if (child.type == TYPE_FOLDER) {
      foldersToRemove.AppendLiteral(",");
      foldersToRemove.AppendInt(child.id);
    }

    BEGIN_CRITICAL_BOOKMARK_CACHE_SECTION(child.id);
  }

  // Delete items from the database now.
  mozStorageTransaction transaction(mDB->MainConn(), false);

  nsCOMPtr<mozIStorageStatement> deleteStatement = mDB->GetStatement(
    NS_LITERAL_CSTRING(
      "DELETE FROM moz_bookmarks "
      "WHERE parent IN (:parent") + foldersToRemove + NS_LITERAL_CSTRING(")")
  );
  NS_ENSURE_STATE(deleteStatement);
  mozStorageStatementScoper deleteStatementScoper(deleteStatement);

  rv = deleteStatement->BindInt64ByName(NS_LITERAL_CSTRING("parent"), folder.id);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = deleteStatement->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  // Clean up orphan items annotations.
  rv = mDB->MainConn()->ExecuteSimpleSQL(
    NS_LITERAL_CSTRING(
      "DELETE FROM moz_items_annos "
      "WHERE id IN ("
        "SELECT a.id from moz_items_annos a "
        "LEFT JOIN moz_bookmarks b ON a.item_id = b.id "
        "WHERE b.id ISNULL)"));
  NS_ENSURE_SUCCESS(rv, rv);

  // Set the lastModified date.
  rv = SetItemDateInternal(LAST_MODIFIED, folder.id, PR_Now());
  NS_ENSURE_SUCCESS(rv, rv);

  for (uint32_t i = 0; i < folderChildrenArray.Length(); i++) {
    BookmarkData& child = folderChildrenArray[i];
    if (child.type == TYPE_BOOKMARK) {
      // If not a tag, recalculate frecency for this entry, since it changed.
      if (child.grandParentId != mTagsRoot) {
        nsNavHistory* history = nsNavHistory::GetHistoryService();
        NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
        rv = history->UpdateFrecency(child.placeId);
        NS_ENSURE_SUCCESS(rv, rv);
      }

      rv = UpdateKeywordsHashForRemovedBookmark(child.id);
      NS_ENSURE_SUCCESS(rv, rv);
    }
    END_CRITICAL_BOOKMARK_CACHE_SECTION(child.id);
  }

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  // Call observers in reverse order to serve children before their parent.
  for (int32_t i = folderChildrenArray.Length() - 1; i >= 0; --i) {
    BookmarkData& child = folderChildrenArray[i];
    nsCOMPtr<nsIURI> uri;
    if (child.type == TYPE_BOOKMARK) {
      // A broken url should not interrupt the removal process.
      (void)NS_NewURI(getter_AddRefs(uri), child.url);
    }

    NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                     nsINavBookmarkObserver,
                     OnItemRemoved(child.id,
                                   child.parentId,
                                   child.position,
                                   child.type,
                                   uri,
                                   child.guid,
                                   child.parentGuid));

    if (child.type == TYPE_BOOKMARK && child.grandParentId == mTagsRoot &&
        uri) {
      // If the removed bookmark was a child of a tag container, notify all
      // bookmark-folder result nodes which contain a bookmark for the removed
      // bookmark's url.
      nsTArray<BookmarkData> bookmarks;
      rv = GetBookmarksForURI(uri, bookmarks);
      NS_ENSURE_SUCCESS(rv, rv);

      for (uint32_t i = 0; i < bookmarks.Length(); ++i) {
        NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                         nsINavBookmarkObserver,
                         OnItemChanged(bookmarks[i].id,
                                       NS_LITERAL_CSTRING("tags"),
                                       false,
                                       EmptyCString(),
                                       bookmarks[i].lastModified,
                                       TYPE_BOOKMARK,
                                       bookmarks[i].parentId,
                                       bookmarks[i].guid,
                                       bookmarks[i].parentGuid));
      }
    }
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::MoveItem(int64_t aItemId, int64_t aNewParent, int32_t aIndex)
{
  NS_ENSURE_ARG(!IsRoot(aItemId));
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_MIN(aNewParent, 1);
  // -1 is append, but no other negative number is allowed.
  NS_ENSURE_ARG_MIN(aIndex, -1);
  // Disallow making an item its own parent.
  NS_ENSURE_ARG(aItemId != aNewParent);

  mozStorageTransaction transaction(mDB->MainConn(), false);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  // if parent and index are the same, nothing to do
  if (bookmark.parentId == aNewParent && bookmark.position == aIndex)
    return NS_OK;

  // Make sure aNewParent is not aFolder or a subfolder of aFolder.
  // TODO: make this performant, maybe with a nested tree (bug 408991).
  if (bookmark.type == TYPE_FOLDER) {
    int64_t ancestorId = aNewParent;

    while (ancestorId) {
      if (ancestorId == bookmark.id) {
        return NS_ERROR_INVALID_ARG;
      }
      rv = GetFolderIdForItem(ancestorId, &ancestorId);
      if (NS_FAILED(rv)) {
        break;
      }
    }
  }

  // calculate new index
  int32_t newIndex, folderCount;
  int64_t grandParentId;
  nsCAutoString newParentGuid;
  rv = FetchFolderInfo(aNewParent, &folderCount, newParentGuid, &grandParentId);
  NS_ENSURE_SUCCESS(rv, rv);
  if (aIndex == nsINavBookmarksService::DEFAULT_INDEX ||
      aIndex >= folderCount) {
    newIndex = folderCount;
    // If the parent remains the same, then the folder is really being moved
    // to count - 1 (since it's being removed from the old position)
    if (bookmark.parentId == aNewParent) {
      --newIndex;
    }
  } else {
    newIndex = aIndex;

    if (bookmark.parentId == aNewParent && newIndex > bookmark.position) {
      // when an item is being moved lower in the same folder, the new index
      // refers to the index before it was removed. Removal causes everything
      // to shift up.
      --newIndex;
    }
  }

  // this is like the previous check, except this covers if
  // the specified index was -1 (append), and the calculated
  // new index is the same as the existing index
  if (aNewParent == bookmark.parentId && newIndex == bookmark.position) {
    // Nothing to do!
    return NS_OK;
  }

  // adjust indices to account for the move
  // do this before we update the parent/index fields
  // or we'll re-adjust the index for the item we are moving
  if (bookmark.parentId == aNewParent) {
    // We can optimize the updates if moving within the same container.
    // We only shift the items between the old and new positions, since the
    // insertion will offset the deletion.
    if (bookmark.position > newIndex) {
      rv = AdjustIndices(bookmark.parentId, newIndex, bookmark.position - 1, 1);
    }
    else {
      rv = AdjustIndices(bookmark.parentId, bookmark.position + 1, newIndex, -1);
    }
    NS_ENSURE_SUCCESS(rv, rv);
  }
  else {
    // We're moving between containers, so this happens in two steps.
    // First, fill the hole from the removal from the old parent.
    rv = AdjustIndices(bookmark.parentId, bookmark.position + 1, PR_INT32_MAX, -1);
    NS_ENSURE_SUCCESS(rv, rv);
    // Now, make room in the new parent for the insertion.
    rv = AdjustIndices(aNewParent, newIndex, PR_INT32_MAX, 1);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  BEGIN_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  {
    // Update parent and position.
    nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
      "UPDATE moz_bookmarks SET parent = :parent, position = :item_index "
      "WHERE id = :item_id "
    );
    NS_ENSURE_STATE(stmt);
    mozStorageStatementScoper scoper(stmt);

    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aNewParent);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("item_index"), newIndex);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), bookmark.id);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->Execute();
    NS_ENSURE_SUCCESS(rv, rv);
  }

  PRTime now = PR_Now();
  rv = SetItemDateInternal(LAST_MODIFIED, bookmark.parentId, now);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = SetItemDateInternal(LAST_MODIFIED, aNewParent, now);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  END_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemMoved(bookmark.id,
                               bookmark.parentId,
                               bookmark.position,
                               aNewParent,
                               newIndex,
                               bookmark.type,
                               bookmark.guid,
                               bookmark.parentGuid,
                               newParentGuid));
  return NS_OK;
}

nsresult
nsNavBookmarks::FetchItemInfo(int64_t aItemId,
                              BookmarkData& _bookmark)
{
  // Check if the requested id is in the recent cache and avoid the database
  // lookup if so.  Invalidate the cache after getting data if requested.
  BookmarkKeyClass* key = mRecentBookmarksCache.GetEntry(aItemId);
  if (key) {
    _bookmark = key->bookmark;
    return NS_OK;
  }

  // LEFT JOIN since not all bookmarks have an associated place.
  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT b.id, h.url, b.title, b.position, b.fk, b.parent, b.type, "
           "b.dateAdded, b.lastModified, b.guid, t.guid, t.parent "
    "FROM moz_bookmarks b "
    "LEFT JOIN moz_bookmarks t ON t.id = b.parent "
    "LEFT JOIN moz_places h ON h.id = b.fk "
    "WHERE b.id = :item_id"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), aItemId);
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasResult;
  rv = stmt->ExecuteStep(&hasResult);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!hasResult) {
    return NS_ERROR_INVALID_ARG;
  }

  _bookmark.id = aItemId;
  rv = stmt->GetUTF8String(1, _bookmark.url);
  NS_ENSURE_SUCCESS(rv, rv);
  bool isNull;
  rv = stmt->GetIsNull(2, &isNull);
  NS_ENSURE_SUCCESS(rv, rv);
  if (isNull) {
    _bookmark.title.SetIsVoid(true);
  }
  else {
    rv = stmt->GetUTF8String(2, _bookmark.title);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  rv = stmt->GetInt32(3, &_bookmark.position);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetInt64(4, &_bookmark.placeId);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetInt64(5, &_bookmark.parentId);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetInt32(6, &_bookmark.type);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetInt64(7, reinterpret_cast<int64_t*>(&_bookmark.dateAdded));
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetInt64(8, reinterpret_cast<int64_t*>(&_bookmark.lastModified));
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetUTF8String(9, _bookmark.guid);
  NS_ENSURE_SUCCESS(rv, rv);
  // Getting properties of the root would show no parent.
  rv = stmt->GetIsNull(10, &isNull);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!isNull) {
    rv = stmt->GetUTF8String(10, _bookmark.parentGuid);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->GetInt64(11, &_bookmark.grandParentId);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  else {
    _bookmark.grandParentId = -1;
  }

  ADD_TO_BOOKMARK_CACHE(aItemId, _bookmark);

  return NS_OK;
}

nsresult
nsNavBookmarks::SetItemDateInternal(enum BookmarkDate aDateType,
                                    int64_t aItemId,
                                    PRTime aValue)
{
  nsCOMPtr<mozIStorageStatement> stmt;
  if (aDateType == DATE_ADDED) {
    // lastModified is set to the same value as dateAdded.  We do this for
    // performance reasons, since it will allow us to use an index to sort items
    // by date.
    stmt = mDB->GetStatement(
      "UPDATE moz_bookmarks SET dateAdded = :date, lastModified = :date "
      "WHERE id = :item_id"
    );
  }
  else {
    stmt = mDB->GetStatement(
      "UPDATE moz_bookmarks SET lastModified = :date WHERE id = :item_id"
    );
  }
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("date"), aValue);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), aItemId);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  // Update the cache entry, if needed.
  BookmarkKeyClass* key = mRecentBookmarksCache.GetEntry(aItemId);
  if (key) {
    if (aDateType == DATE_ADDED) {
      key->bookmark.dateAdded = aValue;
    }
    // Set lastModified in both cases.
    key->bookmark.lastModified = aValue;
  }

  // note, we are not notifying the observers
  // that the item has changed.

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::SetItemDateAdded(int64_t aItemId, PRTime aDateAdded)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);
  bookmark.dateAdded = aDateAdded;

  rv = SetItemDateInternal(DATE_ADDED, bookmark.id, bookmark.dateAdded);
  NS_ENSURE_SUCCESS(rv, rv);

  // Note: mDBSetItemDateAdded also sets lastModified to aDateAdded.
  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(bookmark.id,
                                 NS_LITERAL_CSTRING("dateAdded"),
                                 false,
                                 nsPrintfCString("%lld", bookmark.dateAdded),
                                 bookmark.dateAdded,
                                 bookmark.type,
                                 bookmark.parentId,
                                 bookmark.guid,
                                 bookmark.parentGuid));
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetItemDateAdded(int64_t aItemId, PRTime* _dateAdded)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_POINTER(_dateAdded);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  *_dateAdded = bookmark.dateAdded;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::SetItemLastModified(int64_t aItemId, PRTime aLastModified)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);
  bookmark.lastModified = aLastModified;

  rv = SetItemDateInternal(LAST_MODIFIED, bookmark.id, bookmark.lastModified);
  NS_ENSURE_SUCCESS(rv, rv);

  // Note: mDBSetItemDateAdded also sets lastModified to aDateAdded.
  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(bookmark.id,
                                 NS_LITERAL_CSTRING("lastModified"),
                                 false,
                                 nsPrintfCString("%lld", bookmark.lastModified),
                                 bookmark.lastModified,
                                 bookmark.type,
                                 bookmark.parentId,
                                 bookmark.guid,
                                 bookmark.parentGuid));
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetItemLastModified(int64_t aItemId, PRTime* _lastModified)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_POINTER(_lastModified);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  *_lastModified = bookmark.lastModified;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::SetItemTitle(int64_t aItemId, const nsACString& aTitle)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<mozIStorageStatement> statement = mDB->GetStatement(
    "UPDATE moz_bookmarks SET title = :item_title, lastModified = :date "
    "WHERE id = :item_id "
  );
  NS_ENSURE_STATE(statement);
  mozStorageStatementScoper scoper(statement);

  nsCString title;
  TruncateTitle(aTitle, title);

  // Support setting a null title, we support this in insertBookmark.
  if (title.IsVoid()) {
    rv = statement->BindNullByName(NS_LITERAL_CSTRING("item_title"));
  }
  else {
    rv = statement->BindUTF8StringByName(NS_LITERAL_CSTRING("item_title"),
                                         title);
  }
  NS_ENSURE_SUCCESS(rv, rv);
  bookmark.lastModified = PR_Now();
  rv = statement->BindInt64ByName(NS_LITERAL_CSTRING("date"),
                                  bookmark.lastModified);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = statement->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), bookmark.id);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = statement->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  // Update the cache entry, if needed.
  BookmarkKeyClass* key = mRecentBookmarksCache.GetEntry(aItemId);
  if (key) {
    if (title.IsVoid()) {
      key->bookmark.title.SetIsVoid(true);
    }
    else {
      key->bookmark.title.Assign(title);
    }
    key->bookmark.lastModified = bookmark.lastModified;
  }

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(bookmark.id,
                                 NS_LITERAL_CSTRING("title"),
                                 false,
                                 title,
                                 bookmark.lastModified,
                                 bookmark.type,
                                 bookmark.parentId,
                                 bookmark.guid,
                                 bookmark.parentGuid));
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetItemTitle(int64_t aItemId,
                             nsACString& _title)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  _title = bookmark.title;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetBookmarkURI(int64_t aItemId,
                               nsIURI** _URI)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_POINTER(_URI);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = NS_NewURI(_URI, bookmark.url);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetItemType(int64_t aItemId, uint16_t* _type)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_POINTER(_type);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  *_type = static_cast<uint16_t>(bookmark.type);
  return NS_OK;
}


nsresult
nsNavBookmarks::ResultNodeForContainer(int64_t aItemId,
                                       nsNavHistoryQueryOptions* aOptions,
                                       nsNavHistoryResultNode** aNode)
{
  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  if (bookmark.type == TYPE_FOLDER) { // TYPE_FOLDER
    *aNode = new nsNavHistoryFolderResultNode(bookmark.title,
                                              aOptions,
                                              bookmark.id);
  }
  else {
    return NS_ERROR_INVALID_ARG;
  }

  (*aNode)->mDateAdded = bookmark.dateAdded;
  (*aNode)->mLastModified = bookmark.lastModified;

  NS_ADDREF(*aNode);
  return NS_OK;
}


nsresult
nsNavBookmarks::QueryFolderChildren(
  int64_t aFolderId,
  nsNavHistoryQueryOptions* aOptions,
  nsCOMArray<nsNavHistoryResultNode>* aChildren)
{
  NS_ENSURE_ARG_POINTER(aOptions);
  NS_ENSURE_ARG_POINTER(aChildren);

  // Select all children of a given folder, sorted by position.
  // This is a LEFT JOIN because not all bookmarks types have a place.
  // We construct a result where the first columns exactly match those returned
  // by mDBGetURLPageInfo, and additionally contains columns for position,
  // item_child, and folder_child from moz_bookmarks.
  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT h.id, h.url, IFNULL(b.title, h.title), h.rev_host, h.visit_count, "
           "h.last_visit_date, f.url, null, b.id, b.dateAdded, b.lastModified, "
           "b.parent, null, h.frecency, b.position, b.type, b.fk, "
           "b.guid "
    "FROM moz_bookmarks b "
    "LEFT JOIN moz_places h ON b.fk = h.id "
    "LEFT JOIN moz_favicons f ON h.favicon_id = f.id "
    "WHERE b.parent = :parent "
    "ORDER BY b.position ASC"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<mozIStorageValueArray> row = do_QueryInterface(stmt, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  int32_t index = -1;
  bool hasResult;
  while (NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
    rv = ProcessFolderNodeRow(row, aOptions, aChildren, index);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return NS_OK;
}


nsresult
nsNavBookmarks::ProcessFolderNodeRow(
  mozIStorageValueArray* aRow,
  nsNavHistoryQueryOptions* aOptions,
  nsCOMArray<nsNavHistoryResultNode>* aChildren,
  int32_t& aCurrentIndex)
{
  NS_ENSURE_ARG_POINTER(aRow);
  NS_ENSURE_ARG_POINTER(aOptions);
  NS_ENSURE_ARG_POINTER(aChildren);

  // The results will be in order of aCurrentIndex. Even if we don't add a node
  // because it was excluded, we need to count its index, so do that before
  // doing anything else.
  aCurrentIndex++;

  int32_t itemType;
  nsresult rv = aRow->GetInt32(kGetChildrenIndex_Type, &itemType);
  NS_ENSURE_SUCCESS(rv, rv);
  int64_t id;
  rv = aRow->GetInt64(nsNavHistory::kGetInfoIndex_ItemId, &id);
  NS_ENSURE_SUCCESS(rv, rv);

  nsRefPtr<nsNavHistoryResultNode> node;

  if (itemType == TYPE_BOOKMARK) {
    nsNavHistory* history = nsNavHistory::GetHistoryService();
    NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
    rv = history->RowToResult(aRow, aOptions, getter_AddRefs(node));
    NS_ENSURE_SUCCESS(rv, rv);

    uint32_t nodeType;
    node->GetType(&nodeType);
    if ((nodeType == nsINavHistoryResultNode::RESULT_TYPE_QUERY &&
         aOptions->ExcludeQueries()) ||
        (nodeType != nsINavHistoryResultNode::RESULT_TYPE_QUERY &&
         nodeType != nsINavHistoryResultNode::RESULT_TYPE_FOLDER_SHORTCUT &&
         aOptions->ExcludeItems())) {
      return NS_OK;
    }
  }
  else if (itemType == TYPE_FOLDER) {
    if (aOptions->ExcludeReadOnlyFolders()) {
      // If the folder is read-only, skip it.
      bool readOnly = false;
      GetFolderReadonly(id, &readOnly);
      if (readOnly)
        return NS_OK;
    }

    nsCAutoString title;
    rv = aRow->GetUTF8String(nsNavHistory::kGetInfoIndex_Title, title);
    NS_ENSURE_SUCCESS(rv, rv);

    node = new nsNavHistoryFolderResultNode(title, aOptions, id);

    rv = aRow->GetInt64(nsNavHistory::kGetInfoIndex_ItemDateAdded,
                        reinterpret_cast<int64_t*>(&node->mDateAdded));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = aRow->GetInt64(nsNavHistory::kGetInfoIndex_ItemLastModified,
                        reinterpret_cast<int64_t*>(&node->mLastModified));
    NS_ENSURE_SUCCESS(rv, rv);
  }
  else {
    // This is a separator.
    if (aOptions->ExcludeItems()) {
      return NS_OK;
    }
    node = new nsNavHistorySeparatorResultNode();

    node->mItemId = id;
    rv = aRow->GetInt64(nsNavHistory::kGetInfoIndex_ItemDateAdded,
                        reinterpret_cast<int64_t*>(&node->mDateAdded));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = aRow->GetInt64(nsNavHistory::kGetInfoIndex_ItemLastModified,
                        reinterpret_cast<int64_t*>(&node->mLastModified));
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Store the index of the node within this container.  Note that this is not
  // moz_bookmarks.position.
  node->mBookmarkIndex = aCurrentIndex;

  NS_ENSURE_TRUE(aChildren->AppendObject(node), NS_ERROR_OUT_OF_MEMORY);

  return NS_OK;
}


nsresult
nsNavBookmarks::QueryFolderChildrenAsync(
  nsNavHistoryFolderResultNode* aNode,
  int64_t aFolderId,
  mozIStoragePendingStatement** _pendingStmt)
{
  NS_ENSURE_ARG_POINTER(aNode);
  NS_ENSURE_ARG_POINTER(_pendingStmt);

  // Select all children of a given folder, sorted by position.
  // This is a LEFT JOIN because not all bookmarks types have a place.
  // We construct a result where the first columns exactly match those returned
  // by mDBGetURLPageInfo, and additionally contains columns for position,
  // item_child, and folder_child from moz_bookmarks.
  nsCOMPtr<mozIStorageAsyncStatement> stmt = mDB->GetAsyncStatement(
    "SELECT h.id, h.url, IFNULL(b.title, h.title), h.rev_host, h.visit_count, "
           "h.last_visit_date, f.url, null, b.id, b.dateAdded, b.lastModified, "
           "b.parent, null, h.frecency, b.position, b.type, b.fk, "
           "b.guid "
    "FROM moz_bookmarks b "
    "LEFT JOIN moz_places h ON b.fk = h.id "
    "LEFT JOIN moz_favicons f ON h.favicon_id = f.id "
    "WHERE b.parent = :parent "
    "ORDER BY b.position ASC"
  );
  NS_ENSURE_STATE(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<mozIStoragePendingStatement> pendingStmt;
  rv = stmt->ExecuteAsync(aNode, getter_AddRefs(pendingStmt));
  NS_ENSURE_SUCCESS(rv, rv);

  NS_IF_ADDREF(*_pendingStmt = pendingStmt);
  return NS_OK;
}


nsresult
nsNavBookmarks::FetchFolderInfo(int64_t aFolderId,
                                int32_t* _folderCount,
                                nsACString& _guid,
                                int64_t* _parentId)
{
  *_folderCount = 0;
  *_parentId = -1;

  // This query has to always return results, so it can't be written as a join,
  // though a left join of 2 subqueries would have the same cost.
  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT count(*), "
            "(SELECT guid FROM moz_bookmarks WHERE id = :parent), "
            "(SELECT parent FROM moz_bookmarks WHERE id = :parent) "
    "FROM moz_bookmarks "
    "WHERE parent = :parent"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("parent"), aFolderId);
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasResult;
  rv = stmt->ExecuteStep(&hasResult);
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_TRUE(hasResult, NS_ERROR_UNEXPECTED);

  // Ensure that the folder we are looking for exists.
  // Can't rely only on parent, since the root has parent 0, that doesn't exist.
  bool isNull;
  rv = stmt->GetIsNull(2, &isNull);
  NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && (!isNull || aFolderId == 0),
                 NS_ERROR_INVALID_ARG);

  rv = stmt->GetInt32(0, _folderCount);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!isNull) {
    rv = stmt->GetUTF8String(1, _guid);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->GetInt64(2, _parentId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::IsBookmarked(nsIURI* aURI, bool* aBookmarked)
{
  NS_ENSURE_ARG(aURI);
  NS_ENSURE_ARG_POINTER(aBookmarked);

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT 1 FROM moz_bookmarks b "
    "JOIN moz_places h ON b.fk = h.id "
    "WHERE h.url = :page_url"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"), aURI);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->ExecuteStep(aBookmarked);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetBookmarkedURIFor(nsIURI* aURI, nsIURI** _retval)
{
  NS_ENSURE_ARG(aURI);
  NS_ENSURE_ARG_POINTER(_retval);

  *_retval = nullptr;

  nsNavHistory* history = nsNavHistory::GetHistoryService();
  NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
  int64_t placeId;
  nsCAutoString placeGuid;
  nsresult rv = history->GetIdForPage(aURI, &placeId, placeGuid);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!placeId) {
    // This URI is unknown, just return null.
    return NS_OK;
  }

  // Check if a bookmark exists in the redirects chain for this URI.
  // The query will also check if the page is directly bookmarked, and return
  // the first found bookmark in case.  The check is directly on moz_bookmarks
  // without special filtering.
  // The next query finds the bookmarked ancestors in a redirects chain.
  // It won't go further than 3 levels of redirects (a->b->c->your_place_id).
  // To make this path 100% correct (up to any level) we would need either:
  //  - A separate hash, build through recursive querying of the database.
  //    This solution was previously implemented, but it had a negative effect
  //    on startup since at each startup we have to recursively query the
  //    database to rebuild a hash that is always the same across sessions.
  //    It must be updated at each visit and bookmarks change too.  The code to
  //    manage it is complex and prone to errors, sometimes causing incorrect
  //    data fetches (for example wrong favicon for a redirected bookmark).
  //  - A better way to track redirects for a visit.
  //    We would need a separate table to track redirects, in the table we would
  //    have visit_id, redirect_session.  To get all sources for
  //    a visit then we could just join this table and get all visit_id that
  //    are in the same redirect_session as our visit.  This has the drawback
  //    that we can't ensure data integrity in the downgrade -> upgrade path,
  //    since an old version would not update the table on new visits.
  //
  // For most cases these levels of redirects should be fine though, it's hard
  // to hit a page that is 4 or 5 levels of redirects below a bookmarked page.
  //
  // As a bonus the query also checks first if place_id is already a bookmark,
  // so you don't have to check that apart.

  nsCString query = nsPrintfCString(
    "SELECT url FROM moz_places WHERE id = ( "
      "SELECT :page_id FROM moz_bookmarks WHERE fk = :page_id "
      "UNION ALL "
      "SELECT COALESCE(grandparent.place_id, parent.place_id) AS r_place_id "
      "FROM moz_historyvisits dest "
      "LEFT JOIN moz_historyvisits parent ON parent.id = dest.from_visit " 
                                        "AND dest.visit_type IN (%d, %d) "
      "LEFT JOIN moz_historyvisits grandparent ON parent.from_visit = grandparent.id "
                                             "AND parent.visit_type IN (%d, %d) "
      "WHERE dest.place_id = :page_id "
      "AND EXISTS(SELECT 1 FROM moz_bookmarks WHERE fk = r_place_id) "
      "LIMIT 1 "
    ")",
    nsINavHistoryService::TRANSITION_REDIRECT_PERMANENT,
    nsINavHistoryService::TRANSITION_REDIRECT_TEMPORARY,
    nsINavHistoryService::TRANSITION_REDIRECT_PERMANENT,
    nsINavHistoryService::TRANSITION_REDIRECT_TEMPORARY
  );

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(query);
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("page_id"), placeId);
  NS_ENSURE_SUCCESS(rv, rv);
  bool hasBookmarkedOrigin;
  if (NS_SUCCEEDED(stmt->ExecuteStep(&hasBookmarkedOrigin)) &&
      hasBookmarkedOrigin) {
    nsCAutoString spec;
    rv = stmt->GetUTF8String(0, spec);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = NS_NewURI(_retval, spec);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // If there is no bookmarked origin, we will just return null.
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::ChangeBookmarkURI(int64_t aBookmarkId, nsIURI* aNewURI)
{
  NS_ENSURE_ARG_MIN(aBookmarkId, 1);
  NS_ENSURE_ARG(aNewURI);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aBookmarkId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_ARG(bookmark.type == TYPE_BOOKMARK);

  mozStorageTransaction transaction(mDB->MainConn(), false);

  nsNavHistory* history = nsNavHistory::GetHistoryService();
  NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
  int64_t newPlaceId;
  nsCAutoString newPlaceGuid;
  rv = history->GetOrCreateIdForPage(aNewURI, &newPlaceId, newPlaceGuid);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!newPlaceId)
    return NS_ERROR_INVALID_ARG;

  BEGIN_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  nsCOMPtr<mozIStorageStatement> statement = mDB->GetStatement(
    "UPDATE moz_bookmarks SET fk = :page_id, lastModified = :date "
    "WHERE id = :item_id "
  );
  NS_ENSURE_STATE(statement);
  mozStorageStatementScoper scoper(statement);

  rv = statement->BindInt64ByName(NS_LITERAL_CSTRING("page_id"), newPlaceId);
  NS_ENSURE_SUCCESS(rv, rv);
  bookmark.lastModified = PR_Now();
  rv = statement->BindInt64ByName(NS_LITERAL_CSTRING("date"),
                                  bookmark.lastModified);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = statement->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), bookmark.id);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = statement->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  END_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  rv = history->UpdateFrecency(newPlaceId);
  NS_ENSURE_SUCCESS(rv, rv);

  // Upon changing the URI for a bookmark, update the frecency for the old
  // place as well.
  rv = history->UpdateFrecency(bookmark.placeId);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCAutoString spec;
  rv = aNewURI->GetSpec(spec);
  NS_ENSURE_SUCCESS(rv, rv);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(bookmark.id,
                                 NS_LITERAL_CSTRING("uri"),
                                 false,
                                 spec,
                                 bookmark.lastModified,
                                 bookmark.type,
                                 bookmark.parentId,
                                 bookmark.guid,
                                 bookmark.parentGuid));
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetFolderIdForItem(int64_t aItemId, int64_t* _parentId)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_POINTER(_parentId);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  // this should not happen, but see bug #400448 for details
  NS_ENSURE_TRUE(bookmark.id != bookmark.parentId, NS_ERROR_UNEXPECTED);

  *_parentId = bookmark.parentId;
  return NS_OK;
}


nsresult
nsNavBookmarks::GetBookmarkIdsForURITArray(nsIURI* aURI,
                                           nsTArray<int64_t>& aResult,
                                           bool aSkipTags)
{
  NS_ENSURE_ARG(aURI);

  // Double ordering covers possible lastModified ties, that could happen when
  // importing, syncing or due to extensions.
  // Note: not using a JOIN is cheaper in this case.
  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT b.id, b.guid, b.parent, b.lastModified, t.guid, t.parent "
    "FROM moz_bookmarks b "
    "JOIN moz_bookmarks t on t.id = b.parent "
    "WHERE b.fk = (SELECT id FROM moz_places WHERE url = :page_url) "
    "ORDER BY b.lastModified DESC, b.id DESC "
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"), aURI);
  NS_ENSURE_SUCCESS(rv, rv);

  bool more;
  while (NS_SUCCEEDED((rv = stmt->ExecuteStep(&more))) && more) {
    if (aSkipTags) {
      // Skip tags, for the use-cases of this async getter they are useless.
      int64_t grandParentId;
      nsresult rv = stmt->GetInt64(5, &grandParentId);
      NS_ENSURE_SUCCESS(rv, rv);
      if (grandParentId == mTagsRoot) {
        continue;
      }
    }
    int64_t bookmarkId;
    rv = stmt->GetInt64(0, &bookmarkId);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_TRUE(aResult.AppendElement(bookmarkId), NS_ERROR_OUT_OF_MEMORY);
  }
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

nsresult
nsNavBookmarks::GetBookmarksForURI(nsIURI* aURI,
                                   nsTArray<BookmarkData>& aBookmarks)
{
  NS_ENSURE_ARG(aURI);

  // Double ordering covers possible lastModified ties, that could happen when
  // importing, syncing or due to extensions.
  // Note: not using a JOIN is cheaper in this case.
  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT b.id, b.guid, b.parent, b.lastModified, t.guid, t.parent "
    "FROM moz_bookmarks b "
    "JOIN moz_bookmarks t on t.id = b.parent "
    "WHERE b.fk = (SELECT id FROM moz_places WHERE url = :page_url) "
    "ORDER BY b.lastModified DESC, b.id DESC "
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"), aURI);
  NS_ENSURE_SUCCESS(rv, rv);

  bool more;
  nsAutoString tags;
  while (NS_SUCCEEDED((rv = stmt->ExecuteStep(&more))) && more) {
    // Skip tags.
    int64_t grandParentId;
    nsresult rv = stmt->GetInt64(5, &grandParentId);
    NS_ENSURE_SUCCESS(rv, rv);
    if (grandParentId == mTagsRoot) {
      continue;
    }

    BookmarkData bookmark;
    bookmark.grandParentId = grandParentId;
    rv = stmt->GetInt64(0, &bookmark.id);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->GetUTF8String(1, bookmark.guid);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->GetInt64(2, &bookmark.parentId);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->GetInt64(3, reinterpret_cast<int64_t*>(&bookmark.lastModified));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = stmt->GetUTF8String(4, bookmark.parentGuid);
    NS_ENSURE_SUCCESS(rv, rv);

    NS_ENSURE_TRUE(aBookmarks.AppendElement(bookmark), NS_ERROR_OUT_OF_MEMORY);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsNavBookmarks::GetBookmarkIdsForURI(nsIURI* aURI, uint32_t* aCount,
                                     int64_t** aBookmarks)
{
  NS_ENSURE_ARG(aURI);
  NS_ENSURE_ARG_POINTER(aCount);
  NS_ENSURE_ARG_POINTER(aBookmarks);

  *aCount = 0;
  *aBookmarks = nullptr;
  nsTArray<int64_t> bookmarks;

  // Get the information from the DB as a TArray
  // TODO (bug 653816): make this API skip tags by default.
  nsresult rv = GetBookmarkIdsForURITArray(aURI, bookmarks, false);
  NS_ENSURE_SUCCESS(rv, rv);

  // Copy the results into a new array for output
  if (bookmarks.Length()) {
    *aBookmarks =
      static_cast<int64_t*>(nsMemory::Alloc(sizeof(int64_t) * bookmarks.Length()));
    if (!*aBookmarks)
      return NS_ERROR_OUT_OF_MEMORY;
    for (uint32_t i = 0; i < bookmarks.Length(); i ++)
      (*aBookmarks)[i] = bookmarks[i];
  }

  *aCount = bookmarks.Length();
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetItemIndex(int64_t aItemId, int32_t* _index)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_POINTER(_index);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  // With respect to the API.
  if (NS_FAILED(rv)) {
    *_index = -1;
    return NS_OK;
  }

  *_index = bookmark.position;
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::SetItemIndex(int64_t aItemId, int32_t aNewIndex)
{
  NS_ENSURE_ARG_MIN(aItemId, 1);
  NS_ENSURE_ARG_MIN(aNewIndex, 0);

  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  // Ensure we are not going out of range.
  int32_t folderCount;
  int64_t grandParentId;
  nsCAutoString folderGuid;
  rv = FetchFolderInfo(bookmark.parentId, &folderCount, folderGuid, &grandParentId);
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_TRUE(aNewIndex < folderCount, NS_ERROR_INVALID_ARG);
  // Check the parent's guid is the expected one.
  MOZ_ASSERT(bookmark.parentGuid == folderGuid);

  BEGIN_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "UPDATE moz_bookmarks SET position = :item_index WHERE id = :item_id"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"), aItemId);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("item_index"), aNewIndex);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  END_CRITICAL_BOOKMARK_CACHE_SECTION(bookmark.id);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemMoved(bookmark.id,
                               bookmark.parentId,
                               bookmark.position,
                               bookmark.parentId,
                               aNewIndex,
                               bookmark.type,
                               bookmark.guid,
                               bookmark.parentGuid,
                               bookmark.parentGuid));

  return NS_OK;
}


nsresult
nsNavBookmarks::UpdateKeywordsHashForRemovedBookmark(int64_t aItemId)
{
  nsAutoString keyword;
  if (NS_SUCCEEDED(GetKeywordForBookmark(aItemId, keyword)) &&
      !keyword.IsEmpty()) {
    nsresult rv = EnsureKeywordsHash();
    NS_ENSURE_SUCCESS(rv, rv);
    mBookmarkToKeywordHash.Remove(aItemId);

    // If the keyword is unused, remove it from the database.
    keywordSearchData searchData;
    searchData.keyword.Assign(keyword);
    searchData.itemId = -1;
    mBookmarkToKeywordHash.EnumerateRead(SearchBookmarkForKeyword, &searchData);
    if (searchData.itemId == -1) {
      nsCOMPtr<mozIStorageAsyncStatement> stmt = mDB->GetAsyncStatement(
        "DELETE FROM moz_keywords "
        "WHERE keyword = :keyword "
        "AND NOT EXISTS ( "
          "SELECT id "
          "FROM moz_bookmarks "
          "WHERE keyword_id = moz_keywords.id "
        ")"
      );
      NS_ENSURE_STATE(stmt);

      rv = stmt->BindStringByName(NS_LITERAL_CSTRING("keyword"), keyword);
      NS_ENSURE_SUCCESS(rv, rv);
      nsCOMPtr<mozIStoragePendingStatement> pendingStmt;
      rv = stmt->ExecuteAsync(nullptr, getter_AddRefs(pendingStmt));
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::SetKeywordForBookmark(int64_t aBookmarkId,
                                      const nsAString& aUserCasedKeyword)
{
  NS_ENSURE_ARG_MIN(aBookmarkId, 1);

  // This also ensures the bookmark is valid.
  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aBookmarkId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = EnsureKeywordsHash();
  NS_ENSURE_SUCCESS(rv, rv);

  // Shortcuts are always lowercased internally.
  nsAutoString keyword(aUserCasedKeyword);
  ToLowerCase(keyword);

  // Check if bookmark was already associated to a keyword.
  nsAutoString oldKeyword;
  rv = GetKeywordForBookmark(bookmark.id, oldKeyword);
  NS_ENSURE_SUCCESS(rv, rv);

  // Trying to set the same value or to remove a nonexistent keyword is a no-op.
  if (keyword.Equals(oldKeyword) || (keyword.IsEmpty() && oldKeyword.IsEmpty()))
    return NS_OK;

  mozStorageTransaction transaction(mDB->MainConn(), false);

  nsCOMPtr<mozIStorageStatement> updateBookmarkStmt = mDB->GetStatement(
    "UPDATE moz_bookmarks "
    "SET keyword_id = (SELECT id FROM moz_keywords WHERE keyword = :keyword), "
        "lastModified = :date "
    "WHERE id = :item_id "
  );
  NS_ENSURE_STATE(updateBookmarkStmt);
  mozStorageStatementScoper updateBookmarkScoper(updateBookmarkStmt);

  if (keyword.IsEmpty()) {
    // Remove keyword association from the hash.
    mBookmarkToKeywordHash.Remove(bookmark.id);
    rv = updateBookmarkStmt->BindNullByName(NS_LITERAL_CSTRING("keyword"));
  }
   else {
    // We are associating bookmark to a new keyword. Create a new keyword
    // record if needed.
    nsCOMPtr<mozIStorageStatement> newKeywordStmt = mDB->GetStatement(
      "INSERT OR IGNORE INTO moz_keywords (keyword) VALUES (:keyword)"
    );
    NS_ENSURE_STATE(newKeywordStmt);
    mozStorageStatementScoper newKeywordScoper(newKeywordStmt);

    rv = newKeywordStmt->BindStringByName(NS_LITERAL_CSTRING("keyword"),
                                          keyword);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = newKeywordStmt->Execute();
    NS_ENSURE_SUCCESS(rv, rv);

    // Add new keyword association to the hash, removing the old one if needed.
    if (!oldKeyword.IsEmpty())
      mBookmarkToKeywordHash.Remove(bookmark.id);
    mBookmarkToKeywordHash.Put(bookmark.id, keyword);
    rv = updateBookmarkStmt->BindStringByName(NS_LITERAL_CSTRING("keyword"), keyword);
  }
  NS_ENSURE_SUCCESS(rv, rv);
  bookmark.lastModified = PR_Now();
  rv = updateBookmarkStmt->BindInt64ByName(NS_LITERAL_CSTRING("date"),
                                           bookmark.lastModified);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = updateBookmarkStmt->BindInt64ByName(NS_LITERAL_CSTRING("item_id"),
                                           bookmark.id);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = updateBookmarkStmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  rv = transaction.Commit();
  NS_ENSURE_SUCCESS(rv, rv);

  // Update the cache entry, if needed.
  BookmarkKeyClass* key = mRecentBookmarksCache.GetEntry(aBookmarkId);
  if (key) {
    key->bookmark.lastModified = bookmark.lastModified;
  }

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(bookmark.id,
                                 NS_LITERAL_CSTRING("keyword"),
                                 false,
                                 NS_ConvertUTF16toUTF8(keyword),
                                 bookmark.lastModified,
                                 bookmark.type,
                                 bookmark.parentId,
                                 bookmark.guid,
                                 bookmark.parentGuid));

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetKeywordForURI(nsIURI* aURI, nsAString& aKeyword)
{
  NS_ENSURE_ARG(aURI);
  aKeyword.Truncate(0);

  nsCOMPtr<mozIStorageStatement> stmt = mDB->GetStatement(
    "SELECT k.keyword "
    "FROM moz_places h "
    "JOIN moz_bookmarks b ON b.fk = h.id "
    "JOIN moz_keywords k ON k.id = b.keyword_id "
    "WHERE h.url = :page_url "
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"), aURI);
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasMore = false;
  rv = stmt->ExecuteStep(&hasMore);
  if (NS_FAILED(rv) || !hasMore) {
    aKeyword.SetIsVoid(true);
    return NS_OK; // not found: return void keyword string
  }

  // found, get the keyword
  rv = stmt->GetString(0, aKeyword);
  NS_ENSURE_SUCCESS(rv, rv);
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetKeywordForBookmark(int64_t aBookmarkId, nsAString& aKeyword)
{
  NS_ENSURE_ARG_MIN(aBookmarkId, 1);
  aKeyword.Truncate(0);

  nsresult rv = EnsureKeywordsHash();
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoString keyword;
  if (!mBookmarkToKeywordHash.Get(aBookmarkId, &keyword)) {
    aKeyword.SetIsVoid(true);
  }
  else {
    aKeyword.Assign(keyword);
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::GetURIForKeyword(const nsAString& aUserCasedKeyword,
                                 nsIURI** aURI)
{
  NS_ENSURE_ARG_POINTER(aURI);
  NS_ENSURE_TRUE(!aUserCasedKeyword.IsEmpty(), NS_ERROR_INVALID_ARG);
  *aURI = nullptr;

  // Shortcuts are always lowercased internally.
  nsAutoString keyword(aUserCasedKeyword);
  ToLowerCase(keyword);

  nsresult rv = EnsureKeywordsHash();
  NS_ENSURE_SUCCESS(rv, rv);

  keywordSearchData searchData;
  searchData.keyword.Assign(keyword);
  searchData.itemId = -1;
  mBookmarkToKeywordHash.EnumerateRead(SearchBookmarkForKeyword, &searchData);

  if (searchData.itemId == -1) {
    // Not found.
    return NS_OK;
  }

  rv = GetBookmarkURI(searchData.itemId, aURI);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}


nsresult
nsNavBookmarks::EnsureKeywordsHash() {
  if (mBookmarkToKeywordHash.IsInitialized())
    return NS_OK;

  mBookmarkToKeywordHash.Init(BOOKMARKS_TO_KEYWORDS_INITIAL_CACHE_SIZE);

  nsCOMPtr<mozIStorageStatement> stmt;
  nsresult rv = mDB->MainConn()->CreateStatement(NS_LITERAL_CSTRING(
    "SELECT b.id, k.keyword "
    "FROM moz_bookmarks b "
    "JOIN moz_keywords k ON k.id = b.keyword_id "
  ), getter_AddRefs(stmt));
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasMore;
  while (NS_SUCCEEDED(stmt->ExecuteStep(&hasMore)) && hasMore) {
    int64_t itemId;
    rv = stmt->GetInt64(0, &itemId);
    NS_ENSURE_SUCCESS(rv, rv);
    nsAutoString keyword;
    rv = stmt->GetString(1, keyword);
    NS_ENSURE_SUCCESS(rv, rv);

    mBookmarkToKeywordHash.Put(itemId, keyword);
  }

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::RunInBatchMode(nsINavHistoryBatchCallback* aCallback,
                               nsISupports* aUserData) {
  SAMPLE_LABEL("bookmarks", "RunInBatchMode");
  NS_ENSURE_ARG(aCallback);

  mBatching = true;

  // Just forward the request to history.  History service must exist for
  // bookmarks to work and we are observing it, thus batch notifications will be
  // forwarded to bookmarks observers.
  nsNavHistory* history = nsNavHistory::GetHistoryService();
  NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
  nsresult rv = history->RunInBatchMode(aCallback, aUserData);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::AddObserver(nsINavBookmarkObserver* aObserver,
                            bool aOwnsWeak)
{
  NS_ENSURE_ARG(aObserver);
  return mObservers.AppendWeakElement(aObserver, aOwnsWeak);
}


NS_IMETHODIMP
nsNavBookmarks::RemoveObserver(nsINavBookmarkObserver* aObserver)
{
  return mObservers.RemoveWeakElement(aObserver);
}

void
nsNavBookmarks::NotifyItemVisited(const ItemVisitData& aData)
{
  nsCOMPtr<nsIURI> uri;
  (void)NS_NewURI(getter_AddRefs(uri), aData.bookmark.url);
  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemVisited(aData.bookmark.id,
                                 aData.visitId,
                                 aData.time,
                                 aData.transitionType,
                                 uri,
                                 aData.bookmark.parentId,
                                 aData.bookmark.guid,
                                 aData.bookmark.parentGuid));
}

void
nsNavBookmarks::NotifyItemChanged(const ItemChangeData& aData)
{
  // A guid must always be defined.
  MOZ_ASSERT(!aData.bookmark.guid.IsEmpty());
  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(aData.bookmark.id,
                                 aData.property,
                                 aData.isAnnotation,
                                 aData.newValue,
                                 aData.bookmark.lastModified,
                                 aData.bookmark.type,
                                 aData.bookmark.parentId,
                                 aData.bookmark.guid,
                                 aData.bookmark.parentGuid));
}

////////////////////////////////////////////////////////////////////////////////
//// nsIObserver

NS_IMETHODIMP
nsNavBookmarks::Observe(nsISupports *aSubject, const char *aTopic,
                        const PRUnichar *aData)
{
  NS_ASSERTION(NS_IsMainThread(), "This can only be called on the main thread");

  if (strcmp(aTopic, TOPIC_PLACES_MAINTENANCE) == 0) {
    // Maintenance can execute direct writes to the database, thus clear all
    // the cached bookmarks.
    mRecentBookmarksCache.Clear();
  }
  else if (strcmp(aTopic, TOPIC_PLACES_SHUTDOWN) == 0) {
    // Stop Observing annotations.
    nsAnnotationService* annosvc = nsAnnotationService::GetAnnotationService();
    if (annosvc) {
      annosvc->RemoveObserver(this);
    }
  }
  else if (strcmp(aTopic, TOPIC_PLACES_CONNECTION_CLOSED) == 0) {
    // Don't even try to notify observers from this point on, the category
    // cache would init services that could try to use our APIs.
    mCanNotify = false;
  }

  return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
//// nsINavHistoryObserver

NS_IMETHODIMP
nsNavBookmarks::OnBeginUpdateBatch()
{
  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver, OnBeginUpdateBatch());
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnEndUpdateBatch()
{
  if (mBatching) {
    mBatching = false;
  }

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver, OnEndUpdateBatch());
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnVisit(nsIURI* aURI, int64_t aVisitId, PRTime aTime,
                        int64_t aSessionID, int64_t aReferringID,
                        uint32_t aTransitionType, const nsACString& aGUID,
                        uint32_t* aAdded)
{
  // If the page is bookmarked, notify observers for each associated bookmark.
  ItemVisitData visitData;
  nsresult rv = aURI->GetSpec(visitData.bookmark.url);
  NS_ENSURE_SUCCESS(rv, rv);
  visitData.visitId = aVisitId;
  visitData.time = aTime;
  visitData.transitionType = aTransitionType;

  nsRefPtr< AsyncGetBookmarksForURI<ItemVisitMethod, ItemVisitData> > notifier =
    new AsyncGetBookmarksForURI<ItemVisitMethod, ItemVisitData>(this, &nsNavBookmarks::NotifyItemVisited, visitData);
  notifier->Init();
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnBeforeDeleteURI(nsIURI* aURI,
                                  const nsACString& aGUID,
                                  uint16_t aReason)
{
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnDeleteURI(nsIURI* aURI,
                            const nsACString& aGUID,
                            uint16_t aReason)
{
#ifdef DEBUG
  nsNavHistory* history = nsNavHistory::GetHistoryService();
  int64_t placeId;
  nsCAutoString placeGuid;
  NS_ABORT_IF_FALSE(
    history && NS_SUCCEEDED(history->GetIdForPage(aURI, &placeId, placeGuid)) && !placeId,
    "OnDeleteURI was notified for a page that still exists?"
  );
#endif
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnClearHistory()
{
  // TODO(bryner): we should notify on visited-time change for all URIs
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnTitleChanged(nsIURI* aURI,
                               const nsAString& aPageTitle,
                               const nsACString& aGUID)
{
  // NOOP. We don't consume page titles from moz_places anymore.
  // Title-change notifications are sent from SetItemTitle.
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnPageChanged(nsIURI* aURI,
                              uint32_t aChangedAttribute,
                              const nsAString& aNewValue,
                              const nsACString& aGUID)
{
  nsresult rv;
  if (aChangedAttribute == nsINavHistoryObserver::ATTRIBUTE_FAVICON) {
    ItemChangeData changeData;
    rv = aURI->GetSpec(changeData.bookmark.url);
    NS_ENSURE_SUCCESS(rv, rv);
    changeData.property = NS_LITERAL_CSTRING("favicon");
    changeData.isAnnotation = false;
    changeData.newValue = NS_ConvertUTF16toUTF8(aNewValue);
    changeData.bookmark.lastModified = 0;
    changeData.bookmark.type = TYPE_BOOKMARK;

    // Favicons may be set to either pure URIs or to folder URIs
    bool isPlaceURI;
    rv = aURI->SchemeIs("place", &isPlaceURI);
    NS_ENSURE_SUCCESS(rv, rv);
    if (isPlaceURI) {
      nsNavHistory* history = nsNavHistory::GetHistoryService();
      NS_ENSURE_TRUE(history, NS_ERROR_OUT_OF_MEMORY);
  
      nsCOMArray<nsNavHistoryQuery> queries;
      nsCOMPtr<nsNavHistoryQueryOptions> options;
      rv = history->QueryStringToQueryArray(changeData.bookmark.url,
                                            &queries, getter_AddRefs(options));
      NS_ENSURE_SUCCESS(rv, rv);

      if (queries.Count() == 1 && queries[0]->Folders().Length() == 1) {
        // Fetch missing data.
        rv = FetchItemInfo(queries[0]->Folders()[0], changeData.bookmark);
        NS_ENSURE_SUCCESS(rv, rv);        
        NotifyItemChanged(changeData);
      }
    }
    else {
      nsRefPtr< AsyncGetBookmarksForURI<ItemChangeMethod, ItemChangeData> > notifier =
        new AsyncGetBookmarksForURI<ItemChangeMethod, ItemChangeData>(this, &nsNavBookmarks::NotifyItemChanged, changeData);
      notifier->Init();
    }
  }
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnDeleteVisits(nsIURI* aURI, PRTime aVisitTime,
                               const nsACString& aGUID,
                               uint16_t aReason)
{
  // Notify "cleartime" only if all visits to the page have been removed.
  if (!aVisitTime) {
    // If the page is bookmarked, notify observers for each associated bookmark.
    ItemChangeData changeData;
    nsresult rv = aURI->GetSpec(changeData.bookmark.url);
    NS_ENSURE_SUCCESS(rv, rv);
    changeData.property = NS_LITERAL_CSTRING("cleartime");
    changeData.isAnnotation = false;
    changeData.bookmark.lastModified = 0;
    changeData.bookmark.type = TYPE_BOOKMARK;

    nsRefPtr< AsyncGetBookmarksForURI<ItemChangeMethod, ItemChangeData> > notifier =
      new AsyncGetBookmarksForURI<ItemChangeMethod, ItemChangeData>(this, &nsNavBookmarks::NotifyItemChanged, changeData);
    notifier->Init();
  }
  return NS_OK;
}


// nsIAnnotationObserver

NS_IMETHODIMP
nsNavBookmarks::OnPageAnnotationSet(nsIURI* aPage, const nsACString& aName)
{
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnItemAnnotationSet(int64_t aItemId, const nsACString& aName)
{
  BookmarkData bookmark;
  nsresult rv = FetchItemInfo(aItemId, bookmark);
  NS_ENSURE_SUCCESS(rv, rv);

  bookmark.lastModified = PR_Now();
  rv = SetItemDateInternal(LAST_MODIFIED, bookmark.id, bookmark.lastModified);
  NS_ENSURE_SUCCESS(rv, rv);

  NOTIFY_OBSERVERS(mCanNotify, mCacheObservers, mObservers,
                   nsINavBookmarkObserver,
                   OnItemChanged(bookmark.id,
                                 aName,
                                 true,
                                 EmptyCString(),
                                 bookmark.lastModified,
                                 bookmark.type,
                                 bookmark.parentId,
                                 bookmark.guid,
                                 bookmark.parentGuid));
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnPageAnnotationRemoved(nsIURI* aPage, const nsACString& aName)
{
  return NS_OK;
}


NS_IMETHODIMP
nsNavBookmarks::OnItemAnnotationRemoved(int64_t aItemId, const nsACString& aName)
{
  // As of now this is doing the same as OnItemAnnotationSet, so just forward
  // the call.
  nsresult rv = OnItemAnnotationSet(aItemId, aName);
  NS_ENSURE_SUCCESS(rv, rv);
  return NS_OK;
}
