/**
 * DeskHub Service Worker – Mitarbeiterbereich (scope: /staff/)
 */
const CACHE      = 'deskhub-staff-v1';
const OFFLINE_URL = '/offline.html';
const PRECACHE   = ['/offline.html', '/assets/css/style.css'];

self.addEventListener('install', e => {
  e.waitUntil(caches.open(CACHE).then(c => c.addAll(PRECACHE)));
  self.skipWaiting();
});

self.addEventListener('activate', e => {
  e.waitUntil(
    caches.keys().then(keys =>
      Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k)))
    )
  );
  self.clients.claim();
});

self.addEventListener('fetch', e => {
  if (e.request.method !== 'GET') return;

  if (e.request.url.match(/\.(css|js|woff2?|png|svg|ico|webp)(\?.*)?$/)) {
    e.respondWith(
      caches.match(e.request).then(cached =>
        cached || fetch(e.request).then(resp => {
          caches.open(CACHE).then(c => c.put(e.request, resp.clone()));
          return resp;
        })
      )
    );
    return;
  }

  e.respondWith(
    fetch(e.request).catch(() => caches.match(OFFLINE_URL))
  );
});