// Service Worker — generado automaticamente
// Estrategia: cache-first para assets, network-first para API

const CACHE_NAME = 'voice-guide-v1';

const PRECACHE_URLS = [
    '/',
    '/index.html',
    '/manifest.json',
  ];

const NETWORK_FIRST_PATTERNS = [
    '/api/',
  ];

// ── install ──────────────────────────────────────────────────────────────────
// Pre-cachea los assets estaticos esenciales al instalar el SW.
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      return cache.addAll(PRECACHE_URLS);
    })
  );
  self.skipWaiting();
});

// ── activate ─────────────────────────────────────────────────────────────────
// Limpia caches de versiones anteriores al activar la nueva version del SW.
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames
          .filter((name) => name !== CACHE_NAME)
          .map((name) => caches.delete(name))
      );
    })
  );
  self.clients.claim();
});

// ── fetch ─────────────────────────────────────────────────────────────────────
// Intercepta peticiones:
//   - URLs que coinciden con NETWORK_FIRST_PATTERNS → network-first con fallback a cache
//   - El resto → cache-first con fallback a network (y guarda en cache la respuesta)
self.addEventListener('fetch', (event) => {
  const url = event.request.url;

  const isNetworkFirst = url.includes('/api/');

  if (isNetworkFirst) {
    // Network-first: intenta red, si falla usa cache
    event.respondWith(
      fetch(event.request)
        .then((response) => {
          if (response && response.status === 200) {
            const responseClone = response.clone();
            caches.open(CACHE_NAME).then((cache) => {
              cache.put(event.request, responseClone);
            });
          }
          return response;
        })
        .catch(() => caches.match(event.request))
    );
  } else {
    // Cache-first: sirve desde cache, si no existe va a red y guarda en cache
    event.respondWith(
      caches.match(event.request).then((cached) => {
        if (cached) {
          return cached;
        }
        return fetch(event.request).then((response) => {
          if (response && response.status === 200) {
            const responseClone = response.clone();
            caches.open(CACHE_NAME).then((cache) => {
              cache.put(event.request, responseClone);
            });
          }
          return response;
        });
      })
    );
  }
});