'use client';

import { useEffect } from 'react';
import { usePathname, useRouter } from 'next/navigation';

import { useUser } from '@/contexts/user-context';

/** Redirects unauthenticated users to login while allowing the shell to render first. */
export function useAuthRedirect() {
  const router = useRouter();
  const pathname = usePathname();
  const { user, loading } = useUser();

  useEffect(() => {
    if (loading || user) {
      return;
    }

    const queryString = window.location.search;
    const callbackUrl = queryString ? `${pathname}${queryString}` : pathname;
    const loginUrl = new URL('/login', window.location.origin);

    loginUrl.searchParams.set('callbackUrl', callbackUrl);
    sessionStorage.setItem('redirect_after_login', callbackUrl);
    router.replace(loginUrl.toString());
  }, [loading, pathname, router, user]);
}