stack/apps/web/src/components/guest-guard.tsx

'use client';

import { useRouter } from 'next/navigation';
import { useEffect } from 'react';
import { useSession } from '@/lib/auth-client';

interface GuestGuardProps {
  children: React.ReactNode;
}

/** Redirects authenticated users away from auth pages. */
export function GuestGuard({ children }: GuestGuardProps): React.ReactElement | null {
  const { data: session, isPending } = useSession();
  const router = useRouter();

  useEffect(() => {
    if (!isPending && session) {
      router.replace('/chat');
    }
  }, [isPending, session, router]);

  if (isPending) {
    return (
      <div className="flex min-h-screen items-center justify-center">
        <div className="text-sm text-text-muted">Loading...</div>
      </div>
    );
  }

  if (session) {
    return null;
  }

  return <>{children}</>;
}