/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict
 * @emails oncall+draft_js
 */
'use strict';

const UserAgent = require("fbjs/lib/UserAgent");

const isSoftNewlineEvent = require("./isSoftNewlineEvent");

const isOSX = UserAgent.isPlatform('Mac OS X');
const KeyBindingUtil = {
  /**
   * Check whether the ctrlKey modifier is *not* being used in conjunction with
   * the altKey modifier. If they are combined, the result is an `altGraph`
   * key modifier, which should not be handled by this set of key bindings.
   */
  isCtrlKeyCommand: function (e: SyntheticKeyboardEvent<>): boolean {
    return !!e.ctrlKey && !e.altKey;
  },
  isOptionKeyCommand: function (e: SyntheticKeyboardEvent<>): boolean {
    return isOSX && e.altKey;
  },
  usesMacOSHeuristics: function (): boolean {
    return isOSX;
  },
  hasCommandModifier: function (e: SyntheticKeyboardEvent<>): boolean {
    return isOSX ? !!e.metaKey && !e.altKey : KeyBindingUtil.isCtrlKeyCommand(e);
  },
  isSoftNewlineEvent
};
module.exports = KeyBindingUtil;