/* Slim Uiltjies AfterCare — Service Worker
   Offline-first caching for the entire app shell + vendor libs.
*/

const CACHE = 'slimuiltjies-v11';
const PRECACHE = [
  './',
  './index.html',
  './manifest.webmanifest',
  './css/styles.css',
  './js/app.js',
  './js/db.js',
  './js/seed.js',
  './js/icons.js',
  './js/invoice.js',
  './js/pdf.js',
  './js/share.js',
  './js/views.js',
  './vendor/jspdf.umd.min.js',
  './vendor/html2canvas.min.js',
  './icons/icon.svg',
  './icons/icon-192.png',
  './icons/icon-512.png',
  './icons/apple-touch-icon.png',
  './icons/favicon-32.png'
];

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

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

self.addEventListener('fetch', (event) => {
  const req = event.request;
  // Only handle GET
  if (req.method !== 'GET') return;

  const url = new URL(req.url);
  // Same-origin only
  if (url.origin !== self.location.origin) return;

  event.respondWith(
    caches.match(req).then((cached) => {
      const networkFetch = fetch(req).then((res) => {
        // Cache successful basic responses for next time
        if (res && res.status === 200 && res.type === 'basic') {
          const copy = res.clone();
          caches.open(CACHE).then((c) => c.put(req, copy));
        }
        return res;
      }).catch(() => cached);

      // Cache-first with network fallback
      return cached || networkFetch;
    })
  );
});