// 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 html;

/// @domName $DOMNAME
class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {

  IDBTransaction transaction(storeName_OR_storeNames, String mode) {
    if (mode != 'readonly' && mode != 'readwrite') {
      throw new ArgumentError(mode);
    }

    // TODO(sra): Ensure storeName_OR_storeNames is a string or List<String>,
    // and copy to JavaScript array if necessary.

    if (_transaction_fn != null) {
      return _transaction_fn(this, storeName_OR_storeNames, mode);
    }

    // Try and create a transaction with a string mode.  Browsers that expect a
    // numeric mode tend to convert the string into a number.  This fails
    // silently, resulting in zero ('readonly').
    var txn = _transaction(storeName_OR_storeNames, mode);
    if (_hasNumericMode(txn)) {
      _transaction_fn = _transaction_numeric_mode;
      txn = _transaction_fn(this, storeName_OR_storeNames, mode);
    } else {
      _transaction_fn = _transaction_string_mode;
    }
    return txn;
  }

  static IDBTransaction _transaction_string_mode($CLASSNAME db, stores, mode) {
    return db._transaction(stores, mode);
  }

  static IDBTransaction _transaction_numeric_mode($CLASSNAME db, stores, mode) {
    int intMode;
    if (mode == 'readonly') intMode = IDBTransaction.READ_ONLY;
    if (mode == 'readwrite') intMode = IDBTransaction.READ_WRITE;
    return db._transaction(stores, intMode);
  }

  @JSName('transaction')
  IDBTransaction _transaction(stores, mode) native;

  static bool _hasNumericMode(txn) =>
      JS('bool', 'typeof(#.mode) === "number"', txn);

$!MEMBERS}

// TODO(sra): This should be a static member of IDBTransaction but dart2js
// can't handle that.  Move it back after dart2js is completely done.
var _transaction_fn;  // Assigned one of the static methods.