// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import '../common.dart';
import '../web_driver.dart';

class Keyboard {
  static const String nullChar = '\uE000';
  static const String cancel = '\uE001';
  static const String help = '\uE002';
  static const String backSpace = '\uE003';
  static const String tab = '\uE004';
  static const String clear = '\uE005';
  static const String returnChar = '\uE006';
  static const String enter = '\uE007';
  static const String shift = '\uE008';
  static const String control = '\uE009';
  static const String alt = '\uE00A';
  static const String pause = '\uE00B';
  static const String escape = '\uE00C';
  static const String space = '\uE00D';
  static const String pageUp = '\uE00E';
  static const String pageDown = '\uE00F';
  static const String end = '\uE010';
  static const String home = '\uE011';
  static const String left = '\uE012';
  static const String up = '\uE013';
  static const String right = '\uE014';
  static const String down = '\uE015';
  static const String insert = '\uE016';
  static const String deleteChar = '\uE017';
  static const String semicolon = '\uE018';
  static const String equals = '\uE019';
  static const String numpad0 = '\uE01A';
  static const String numpad1 = '\uE01B';
  static const String numpad2 = '\uE01C';
  static const String numpad3 = '\uE01D';
  static const String numpad4 = '\uE01E';
  static const String numpad5 = '\uE01F';
  static const String numpad6 = '\uE020';
  static const String numpad7 = '\uE021';
  static const String numpad8 = '\uE022';
  static const String numpad9 = '\uE023';
  static const String multiply = '\uE024';
  static const String add = '\uE025';
  static const String separator = '\uE026';
  static const String subtract = '\uE027';
  static const String decimal = '\uE028';
  static const String divide = '\uE029';
  static const String f1 = '\uE031';
  static const String f2 = '\uE032';
  static const String f3 = '\uE033';
  static const String f4 = '\uE034';
  static const String f5 = '\uE035';
  static const String f6 = '\uE036';
  static const String f7 = '\uE037';
  static const String f8 = '\uE038';
  static const String f9 = '\uE039';
  static const String f10 = '\uE03A';
  static const String f11 = '\uE03B';
  static const String f12 = '\uE03C';
  static const String command = '\uE03D';
  static const String meta = command;

  final WebDriver _driver;
  final Resolver _resolver;

  Keyboard(this._driver) : _resolver = new Resolver(_driver, '');

  /// Simulate pressing many keys at once as a 'chord'.
  void sendChord(Iterable<String> chordToSend) {
    sendKeys(createChord(chordToSend));
  }

  /// Creates a string representation of a chord suitable for use in WebDriver.
  String createChord(Iterable<String> chord) {
    StringBuffer chordString = new StringBuffer();
    for (String s in chord) {
      chordString.write(s);
    }
    chordString.write(nullChar);

    return chordString.toString();
  }

  /// Send [keysToSend] to the active element.
  void sendKeys(String keysToSend) {
    _resolver.post('keys', {
      'value': [keysToSend]
    });
  }

  @override
  String toString() => '$_driver.keyboard';

  @override
  int get hashCode => _driver.hashCode;

  @override
  bool operator ==(other) => other is Keyboard && other._driver == _driver;
}