import { useEffect, useState } from 'react';
import { getCurrentUser, type CurrentUser } from '../api/endpoints';

/**
 * Returns the currently-logged-in dashboard user, or null if not logged in /
 * not yet loaded. Useful for conditionally showing admin-only UI bits.
 *
 * Fetches `/me` once on mount. Cheap — the endpoint just decodes the
 * session cookie and returns {username, is_admin}.
 */
export function useCurrentUser(): { user: CurrentUser | null; loading: boolean } {
  const [user, setUser] = useState<CurrentUser | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    let cancelled = false;
    getCurrentUser()
      .then(u => { if (!cancelled) setUser(u); })
      .catch(() => { if (!cancelled) setUser(null); })
      .finally(() => { if (!cancelled) setLoading(false); });
    return () => { cancelled = true; };
  }, []);

  return { user, loading };
}