/** 是否微信内置浏览器 */
export function isWechatBrowser(): boolean {
  if (typeof navigator === 'undefined') return false;
  return /MicroMessenger/i.test(navigator.userAgent);
}

/** 是否微信小程序 web-view 或独立小程序环境 */
export function isMiniProgram(): boolean {
  if (typeof window === 'undefined') return false;
  const ua = navigator.userAgent.toLowerCase();
  return ua.includes('miniprogram') || (window as Window & { __wxjs_environment?: string }).__wxjs_environment === 'miniprogram';
}

export function getRuntimePlatform(): 'mini' | 'wechat-h5' | 'browser' {
  if (isMiniProgram()) return 'mini';
  if (isWechatBrowser()) return 'wechat-h5';
  return 'browser';
}