sw.js

const CACHE_NAME = 'huddle-cache-v2';
const APP_SHELL = [
  '/',
  '/index.html',
  '/manifest.json',
  '/icon-192.png',
  '/icon-512.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.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key)))
    )
  );
  self.clients.claim();
});

self.addEventListener('fetch', (event) => {
  if (!event.request.url.startsWith('http')) return;

  event.respondWith(
    caches.match(event.request).then((cached) => {
      if (cached) return cached;

      return fetch(event.request)
        .then((response) => {
          const copy = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(event.request, copy));
          return response;
        })
        .catch(() => caches.match('/index.html'));
    })
  );
});