// Recap Studio — Service Worker (PWA)
const CACHE = 'recap-v1';
const STATIC = [
  '/',
  '/manifest.json',
];

// Install: cache static shell
self.addEventListener('install', e => {
  e.waitUntil(
    caches.open(CACHE).then(c => c.addAll(STATIC))
  );
  self.skipWaiting();
});

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

// Fetch: network-first for API, cache-first for shell
self.addEventListener('fetch', e => {
  const url = new URL(e.request.url);

  // API calls — always network, no cache
  if (url.pathname.startsWith('/api/') ||
      url.pathname.startsWith('/outputs/') ||
      url.pathname.startsWith('/auth/')) {
    return;
  }

  // Navigation (HTML pages) — network first, fallback to cache
  if (e.request.mode === 'navigate') {
    e.respondWith(
      fetch(e.request)
        .then(r => {
          const clone = r.clone();
          caches.open(CACHE).then(c => c.put(e.request, clone));
          return r;
        })
        .catch(() => caches.match('/'))
    );
    return;
  }

  // Static assets — cache first
  e.respondWith(
    caches.match(e.request).then(cached => {
      if (cached) return cached;
      return fetch(e.request).then(r => {
        if (r && r.status === 200 && r.type !== 'opaque') {
          const clone = r.clone();
          caches.open(CACHE).then(c => c.put(e.request, clone));
        }
        return r;
      });
    })
  );
});