// ponytail: minimal runtime-cache SW. enough to make the app installable
// (Chrome needs a fetch handler) + offline shell. no precache list — Vite
// hashes bundle names at build, so we cache on first fetch instead.
const CACHE = 'sf-v1'

self.addEventListener('install', () => self.skipWaiting())

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

self.addEventListener('fetch', (e) => {
  const req = e.request
  if (req.method !== 'GET' || new URL(req.url).origin !== self.location.origin) return
  // network-first: always try fresh, fall back to cache offline
  e.respondWith(
    fetch(req)
      .then((res) => {
        const copy = res.clone()
        caches.open(CACHE).then((c) => c.put(req, copy))
        return res
      })
      .catch(() => caches.match(req).then((hit) => hit || caches.match('/')))
  )
})