// 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 web_audio;

$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
$!MEMBERS
  factory AudioContext() => JS('AudioContext',
      'new (window.AudioContext || window.webkitAudioContext)()');

  GainNode createGain() {
    if (JS('bool', '#.createGain !== undefined', this)) {
      return JS('GainNode', '#.createGain()', this);
    } else {
      return JS('GainNode', '#.createGainNode()', this);
    }
  }

  ScriptProcessorNode createScriptProcessor([int$NULLABLE bufferSize,
      int$NULLABLE numberOfInputChannels,
      int$NULLABLE numberOfOutputChannels]) {
    var function = JS(
        '=Object',
        '#.createScriptProcessor || '
        '#.createJavaScriptNode',
        this,
        this);
    if (numberOfOutputChannels != null) {
      return JS('ScriptProcessorNode', '#.call(#, #, #, #)', function, this,
          bufferSize, numberOfInputChannels, numberOfOutputChannels);
    } else if (numberOfInputChannels != null) {
      return JS('ScriptProcessorNode', '#.call(#, #, #)', function, this,
          bufferSize, numberOfInputChannels);
    } else if (bufferSize != null) {
      return JS(
          'ScriptProcessorNode', '#.call(#, #)', function, this, bufferSize);
    } else {
      return JS(
          'ScriptProcessorNode', '#.call(#)', function, this);
    }
  }

  @JSName('decodeAudioData')
  Future$#NULLSAFECAST(<AudioBuffer>) _decodeAudioData(ByteBuffer audioData,
      [DecodeSuccessCallback$NULLABLE successCallback,
      DecodeErrorCallback$NULLABLE errorCallback]) native;

  Future<AudioBuffer> decodeAudioData(ByteBuffer audioData,
      [DecodeSuccessCallback$NULLABLE successCallback,
      DecodeErrorCallback$NULLABLE errorCallback]) {
    if (successCallback != null &&  errorCallback != null) {
      return _decodeAudioData(audioData, successCallback, errorCallback);
    }

    var completer = new Completer<AudioBuffer>();
    _decodeAudioData(audioData, (value) {
      completer.complete(value);
    }, (error) {
      if (error == null) {
        completer.completeError('');
      } else {
        completer.completeError(error);
      }
    });
    return completer.future;
  }
}