sw.js

/* ─── Service Worker · Chomp Snake PWA ─── */
const CACHE_NAME = 'chomp-snake-v1';

const ASSETS = [
  '/',
  '/index.html',
  '/manifest.json',
  '/styles/main.css',
  '/js/constants.js',
  '/js/security.js',
  '/js/audio.js',
  '/js/ranks.js',
  '/js/dashboard.js',
  '/js/game.js',
  '/js/main.js',
  '/icons/icon-192.svg',
  '/icons/icon-512.svg'
];

/* ── Install: pre-cache all static assets ── */
self.addEventListener('install', e => {
  e.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => cache.addAll(ASSETS))
      .then(() => self.skipWaiting())
  );
});

/* ── Activate: purge old caches ── */
self.addEventListener('activate', e => {
  e.waitUntil(
    caches.keys().then(keys =>
      Promise.all(keys
        .filter(k => k !== CACHE_NAME)
        .map(k => caches.delete(k))
      )
    ).then(() => self.clients.claim())
  );
});

/* ── Fetch: cache-first, fallback to network ── */
self.addEventListener('fetch', e => {
  // Only handle GET requests
  if (e.request.method !== 'GET') return;

  e.respondWith(
    caches.match(e.request).then(cached => {
      if (cached) return cached;
      return fetch(e.request).then(response => {
        // Don't cache bad responses
        if (!response || response.status !== 200 || response.type !== 'basic') {
          return response;
        }
        // Clone and cache
        const toCache = response.clone();
        caches.open(CACHE_NAME).then(cache => cache.put(e.request, toCache));
        return response;
      });
    }).catch(() => caches.match('/index.html'))
  );
});