sw.js

const CACHE_NAME = 'nuke-modules-cache-v1';
const APP_SHELL = [
  './',
  './index.html',
  './styles.css',
  './app.js',
  './assets/logo.png'
];

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

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

// Network-first for HTML; cache-first for static assets
self.addEventListener('fetch', (event) => {
  const { request } = event;
  const isHTML = request.headers.get('accept')?.includes('text/html');

  if (isHTML) {
    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).then((res) => res || caches.match('./index.html')))
    );
    return;
  }

  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) return cached;
      return fetch(request).then((response) => {
        const copy = response.clone();
        caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
        return response;
      });
    })
  );
});