const ARTIKEL_QUERY_KEY = 'dashfront:artikel-query';

export function queryFromParams(searchParams) {
  return {
    target: searchParams.get('target') ?? '',
    filter: searchParams.get('filter') ?? '',
    offset: Math.max(0, Number(searchParams.get('offset')) || 0),
  };
}

export function buildSearchUrl(target, filter = '', offset = 0) {
  const params = new URLSearchParams();
  if (target) params.set('target', target);
  if (filter) params.set('filter', filter);
  if (offset > 0) params.set('offset', String(offset));
  const qs = params.toString();
  return qs ? `/artikel?${qs}` : '/artikel';
}

export function readArtikelQuery() {
  try {
    const raw = localStorage.getItem(ARTIKEL_QUERY_KEY);
    return raw ? JSON.parse(raw) : null;
  } catch {
    return null;
  }
}

export function writeArtikelQuery({ target, filter = '', offset = 0 }) {
  try {
    if (!target || target.trim().length < 3) {
      localStorage.removeItem(ARTIKEL_QUERY_KEY);
      return;
    }
    localStorage.setItem(
      ARTIKEL_QUERY_KEY,
      JSON.stringify({ target, filter, offset }),
    );
  } catch {
    // ignore quota / private mode
  }
}

export function clearArtikelQuery() {
  try {
    localStorage.removeItem(ARTIKEL_QUERY_KEY);
  } catch {
    // ignore
  }
}

/** Build `/artikel?target=…` from the last stored query, or plain `/artikel`. */
export function artikelQueryPath() {
  const query = readArtikelQuery();
  if (!query?.target || query.target.trim().length < 3) return '/artikel';
  return buildSearchUrl(query.target, query.filter ?? '', query.offset ?? 0);
}