/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import * as browser from '../../../vs/base/browser/browser';
import * as platform from '../../../vs/base/common/platform';

export const enum KeyboardSupport {
  Always,
  FullScreen,
  None,
}

/**
 * Browser feature we can support in current platform, browser and environment.
 */
export const BrowserFeatures = {
  clipboard: {
    writeText:
      platform.isNative ||
      (document.queryCommandSupported &&
        document.queryCommandSupported('copy')) ||
      !!(navigator && navigator.clipboard && navigator.clipboard.writeText),
    readText:
      platform.isNative ||
      !!(navigator && navigator.clipboard && navigator.clipboard.readText),
  },
  keyboard: (() => {
    if (platform.isNative || browser.isStandalone) {
      return KeyboardSupport.Always;
    }

    if ((<any>navigator).keyboard || browser.isSafari) {
      return KeyboardSupport.FullScreen;
    }

    return KeyboardSupport.None;
  })(),

  // 'ontouchstart' in window always evaluates to true with typescript's modern typings. This causes `window` to be
  // `never` later in `window.navigator`. That's why we need the explicit `window as Window` cast
  touch:
    'ontouchstart' in window ||
    navigator.maxTouchPoints > 0 ||
    (window as Window).navigator.msMaxTouchPoints > 0,
  pointerEvents:
    window.PointerEvent &&
    ('ontouchstart' in window ||
      (window as Window).navigator.maxTouchPoints > 0 ||
      navigator.maxTouchPoints > 0 ||
      (window as Window).navigator.msMaxTouchPoints > 0),
};