// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

part of $LIBRARYNAME;

$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
  /**
   * Checks to see if Indexed DB is supported on the current platform.
   */
  static bool get supported {
    return JS('bool',
        '!!(window.indexedDB || '
        'window.webkitIndexedDB || '
        'window.mozIndexedDB)');
  }

  Future<Database> open(String name,
      {int$NULLABLE version,
      void onUpgradeNeeded(VersionChangeEvent event)$NULLABLE,
      void onBlocked(Event event)$NULLABLE}) {
    if ((version == null) != (onUpgradeNeeded == null)) {
      return new Future.error(new ArgumentError(
          'version and onUpgradeNeeded must be specified together'));
    }
    try {
      OpenDBRequest request;
      if (version != null) {
        request = _open(name, version);
      } else {
        request = _open(name);
      }

      if (onUpgradeNeeded != null) {
        request.onUpgradeNeeded.listen(onUpgradeNeeded);
      }
      if (onBlocked != null) {
        request.onBlocked.listen(onBlocked);
      }
      return _completeRequest(request);
    } catch (e, stacktrace) {
      return new Future.error(e, stacktrace);
    }
  }

  Future<IdbFactory> deleteDatabase(String name,
      {void onBlocked(Event e)$NULLABLE}) {
    try {
      var request = _deleteDatabase(name);

      if (onBlocked != null) {
        request.onBlocked.listen(onBlocked);
      }
      var completer = new Completer<IdbFactory>.sync();
      request.onSuccess.listen((e) {
        completer.complete(this);
      });
      request.onError.listen(completer.completeError);
      return completer.future;
    } catch (e, stacktrace) {
      return new Future.error(e, stacktrace);
    }
  }

  /**
   * Checks to see if getDatabaseNames is supported by the current platform.
   * TODO(terry): Should be able to always return false?
   */
  bool get supportsDatabaseNames {
    return supported && JS('bool',
        '!!(#.getDatabaseNames || #.webkitGetDatabaseNames)', this, this);
  }

$!MEMBERS
}


/**
 * Ties a request to a completer, so the completer is completed when it succeeds
 * and errors out when the request errors.
 */
Future<T> _completeRequest<T>(Request request) {
  var completer = new Completer<T>.sync();
  // TODO: make sure that completer.complete is synchronous as transactions
  // may be committed if the result is not processed immediately.
  request.onSuccess.listen((e) {
    T result = request.result;
    completer.complete(result);
  });
  request.onError.listen(completer.completeError);
  return completer.future;
}