'use client';

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

type UseAuthGuardOptions = {
  required?: boolean;
};

export function useAuthGuard(options: UseAuthGuardOptions = {}) {
  const { required = true } = options;
  const pathname = usePathname();
  const router = useRouter();
  const { data: rawSession, isPending } = authClient.useSession();
  const session = (rawSession ?? null) as {
    user?: {
      id?: string;
      name?: string | null;
      email?: string | null;
      image?: string | null;
    };
  } | null;

  const isAuthenticated = Boolean(session?.user?.id);

  useEffect(() => {
    if (!required || isPending || isAuthenticated || pathname.startsWith('/auth')) {
      return;
    }

    const currentPath = typeof window === 'undefined'
      ? pathname
      : `${window.location.pathname}${window.location.search}`;
    const query = currentPath && currentPath !== '/'
      ? `?next=${encodeURIComponent(currentPath)}`
      : '';

    router.replace(`/auth/signin${query}`);
  }, [required, isPending, isAuthenticated, pathname, router]);

  return {
    session,
    isPending,
    isAuthenticated
  };
}