const CACHE_NAME = 'adonis-v1';
const OFFLINE_URL = '/pages/offline';

const PRECACHE = [
  '/',
  OFFLINE_URL,
];

// Cache-first file extensions
const CACHE_FIRST_EXT = ['.css', '.woff', '.woff2', '.ttf', '.otf'];

self.addEventListener('install', (e) => {
  e.waitUntil(
    caches.open(CACHE_NAME)
      .then((c) => c.addAll(PRECACHE))
      .then(() => self.skipWaiting())
  );
});

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())
  );
});

self.addEventListener('fetch', (e) => {
  const req = e.request;
  const url = new URL(req.url);

  // Only handle GET; skip cross-origin non-asset requests
  if (req.method !== 'GET') return;

  const isSameOrigin = url.origin === self.location.origin;
  const isCDN = url.hostname.includes('cdn.shopify.com');
  const isStaticExt = CACHE_FIRST_EXT.some((ext) => url.pathname.endsWith(ext));

  if (isStaticExt || isCDN) {
    // Cache-first for static/CDN assets
    e.respondWith(
      caches.match(req).then((hit) => {
        if (hit) return hit;
        return fetch(req).then((res) => {
          if (res.ok) {
            const clone = res.clone();
            caches.open(CACHE_NAME).then((c) => c.put(req, clone));
          }
          return res;
        });
      })
    );
    return;
  }

  if (isSameOrigin) {
    // Network-first for pages — fall back to offline page
    e.respondWith(
      fetch(req).catch(() =>
        caches.match(req).then((hit) => hit || caches.match(OFFLINE_URL))
      )
    );
  }
});