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/* Punto de Pan - Service Worker (PWA)
   Estrategias:
   - Navegaciones: Network-first con fallback a offline.html
   - Estáticos (CSS/JS/IMG/WEBMANIFEST): Stale-while-revalidate
*/

const CACHE_VERSION = 'pp-v1.0.0';
const RUNTIME_CACHE = `pp-runtime-${CACHE_VERSION}`;
const STATIC_CACHE = `pp-static-${CACHE_VERSION}`;

// Archivos base a precachear (shell mínimo)
const CORE_ASSETS = [
  'offline.html',
  'manifest.webmanifest',
  'styles/styles.css',
  'css/style.css',
  'js/script.js',
  'assets/js/main.js',
  'img/cuerno.png',
  'img/logo.png',
  'images/background1.png'
];

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

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

// Utilidades
const isHtmlNavigation = (request) => request.mode === 'navigate' || (request.method === 'GET' && request.headers.get('accept')?.includes('text/html'));
const isStaticAsset = (request) => {
  const url = new URL(request.url);
  // Sólo mismo origen
  if (url.origin !== location.origin) return false;
  return /\.(?:css|js|mjs|png|jpg|jpeg|svg|gif|webp|ico|avif|ttf|woff2?|mp3|mp4|webm|json)$/i.test(url.pathname) || url.pathname.endsWith('manifest.webmanifest');
};

self.addEventListener('fetch', (event) => {
  const { request } = event;

  // Navegaciones: network-first -> offline
  if (isHtmlNavigation(request)) {
    event.respondWith(
      (async () => {
        try {
          const fresh = await fetch(request);
          return fresh;
        } catch (err) {
          const cache = await caches.open(STATIC_CACHE);
          const offline = await cache.match('offline.html');
          return offline || new Response('Estás offline.', { headers: { 'Content-Type': 'text/plain; charset=utf-8' } });
        }
      })()
    );
    return;
  }

  // Estáticos: stale-while-revalidate
  if (isStaticAsset(request)) {
    event.respondWith(
      (async () => {
        const cache = await caches.open(STATIC_CACHE);
        const cached = await cache.match(request);
        const networkFetch = fetch(request)
          .then((resp) => {
            if (resp && resp.ok) cache.put(request, resp.clone());
            return resp;
          })
          .catch(() => undefined);
        return cached || networkFetch || new Response('', { status: 504 });
      })()
    );
    return;
  }

  // Otros: pasar directo
  return;
});
User / IP	: 216.73.217.33
Host / Server	: 45.84.207.204 / aircan.me
System	: Linux lt-bnk-web1726.main-hosting.eu 5.14.0-611.36.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Mar 3 11:23:52 EST 2026 x86_64