/**
 * 浏览器 / WebView 检测
 */
export const BrowserDetector = {
  /** 当前是否在 Facebook 内嵌浏览器 */
  isFacebookInAppBrowser(ua: string | null = null): boolean {
    if (typeof navigator === "undefined" && !ua) return false;
    const userAgent = ua ?? (typeof navigator !== "undefined" ? navigator.userAgent : "");
    return /FBAN|FBAV|Instagram/i.test(userAgent);
  },

  /** 当前是否在微信内嵌浏览器 */
  isWeChatInAppBrowser(ua: string | null = null): boolean {
    if (typeof navigator === "undefined" && !ua) return false;
    const userAgent = ua ?? (typeof navigator !== "undefined" ? navigator.userAgent : "");
    return /MicroMessenger/i.test(userAgent);
  },

  /** 当前是否在 WebView（不通用；仅作 best-effort 判断） */
  isInAppBrowser(ua: string | null = null): boolean {
    if (typeof navigator === "undefined" && !ua) return false;
    const userAgent = ua ?? (typeof navigator !== "undefined" ? navigator.userAgent : "");
    return /WebView|; wv\)|FBAN|FBAV|MicroMessenger|Instagram|Line\//i.test(userAgent);
  },

};