/**
 * DeskHub Service Worker – Mitarbeiterbereich (scope: /staff/)
 */
const CACHE      = 'deskhub-staff-v2';
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))
  );
});

// ── Push Notifications ────────────────────────────────────────────────────────
self.addEventListener('push', e => {
  let data = { title: 'DeskHub', body: 'Neue Benachrichtigung', url: '/staff/', icon: '/assets/icons/icon-192.png' };
  try { data = Object.assign(data, e.data.json()); } catch {}
  e.waitUntil(
    self.registration.showNotification(data.title, {
      body:    data.body,
      icon:    data.icon,
      badge:   data.badge || '/assets/icons/icon-192.png',
      data:    { url: data.url },
      vibrate: [150, 50, 150],
      tag:     'deskhub-' + (data.url || ''),
      renotify: true,
    })
  );
});

self.addEventListener('notificationclick', e => {
  e.notification.close();
  const url = e.notification.data?.url || '/staff/';
  e.waitUntil(
    clients.matchAll({ type: 'window', includeUncontrolled: true }).then(list => {
      for (const c of list) {
        if (c.url.includes('/staff/') && 'focus' in c) {
          c.navigate(url);
          return c.focus();
        }
      }
      return clients.openWindow(url);
    })
  );
});