sw.js

const CACHE_NAME = 'augmentlab-cache-v1';
const ASSETS = [
  '/',
  '/index.html',
  '/styles.css',
  '/script.js',
  '/manifest.json'
];

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

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

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

  // Network-first for HTML, cache-first for others
  if (request.headers.get('accept')?.includes('text/html')) {
    event.respondWith(
      fetch(request).then((response) => {
        const copy = response.clone();
        caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
        return response;
      }).catch(() => caches.match(request))
    );
  } else {
    event.respondWith(
      caches.match(request).then((cached) =>
        cached || fetch(request).then((response) => {
          const copy = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
          return response;
        })
      )
    );
  }
});