service-worker.js

const CACHE_NAME = 'dieta-piano-v2';
const APP_ASSETS = [
  './',
  './index.html',
  './manifest.webmanifest',
  './icons/icon-192.svg',
  './icons/icon-512.svg',
  './icons/icon-180.svg'
];

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

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

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

  const requestUrl = new URL(event.request.url);
  const isHtmlNavigation = event.request.mode === 'navigate' || requestUrl.pathname.endsWith('/index.html');

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