// Copyright (c) Meta Platforms, Inc. and affiliates.

/**
 * @file isApplePlatform.ts
 * @input Reads navigator.userAgentData.platform and navigator.platform
 * @output Exports isApplePlatform
 * @position Internal util; the single platform detection behind useHotkeys and Kbd
 *
 * Deliberately absent from utils/index.ts: packages/core/src/index.ts does
 * `export * from './utils'`, so naming it there would publish it as API.
 * Import it by path, as interactionModality is imported.
 */

/**
 * Detects whether the current platform is macOS/iOS.
 * Prefers the User-Agent Client Hints API when it names a platform (modern
 * Chrome/Edge), falls back to navigator.platform (deprecated but universally
 * supported) when it names none.
 */
export function isApplePlatform(): boolean {
  if (typeof navigator === 'undefined') {
    return false;
  }
  const uaData = 'userAgentData' in navigator ? navigator.userAgentData : null;
  if (uaData && typeof uaData === 'object' && 'platform' in uaData) {
    const uaPlatform = (uaData as {
      platform?: unknown;
    }).platform;
    const named = typeof uaPlatform === 'string' ? uaPlatform.trim() : '';
    // A value that names nothing is no answer, not a negative one: builds that
    // rewrite their client-hints identity ship '', and 'Unknown' is the spec's
    // own sentinel for "cannot say". Both fall through rather than reading as
    // "not Apple".
    if (named !== '' && named.toLowerCase() !== 'unknown') {
      return /mac/i.test(named);
    }
  }
  return /Mac|iPhone|iPad|iPod/.test(navigator.platform ?? '');
}