/**
 * A few screens, so no router dependency — just enough hash handling that the
 * Android back button behaves inside an installed PWA.
 *
 * `route === null` means "wherever the day state says", which is the default the
 * worker should land on.
 */

const ROUTES = ['resume', 'today', 'settings', 'stats', 'details', 'automations', 'non-working', 'data'];

function fromHash() {
  const [path, query = ''] = location.hash.replace(/^#\/?/, '').split('?');
  const date = new URLSearchParams(query).get('date');
  return { route: ROUTES.includes(path) ? path : null,
    selectedDate: date && /^\d{4}-\d{2}-\d{2}$/.test(date) ? date : '' };
}

export const router = $state(fromHash());

window.addEventListener('hashchange', () => {
  const next = fromHash();
  router.route = next.route;
  if (next.selectedDate) router.selectedDate = next.selectedDate;
});

export function go(route) {
  const date = ['resume', 'details'].includes(route) && router.selectedDate ? `?date=${router.selectedDate}` : '';
  location.hash = route ? `#/${route}${date}` : '';
}

export function back() {
  if (history.length > 1) history.back();
  else go(null);
}