// Basic service worker for PWA installability and future caching
// Generated by Copilot — you can extend with runtime caching if needed.

const CACHE_NAME = 'cvl-cache-v1';
const APP_SHELL = [
  '/',
  '/index.html',
  '/icon.png',
  // Vite will handle asset hashing; we keep shell minimal to avoid stale caches.
];

self.addEventListener('install', (event) => {
  // Skip waiting so updates activate faster.
  self.skipWaiting();
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => cache.addAll(APP_SHELL)).catch(() => void 0)
  );
});

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((keys) =>
      Promise.all(
        keys.map((k) => (k === CACHE_NAME ? undefined : caches.delete(k)))
      )
    )
  );
  // Take control of uncontrolled clients as soon as possible.
  self.clients.claim();
});

self.addEventListener('fetch', (event) => {
  const { request } = event;
  // Only handle GET requests and same-origin.
  if (request.method !== 'GET' || new URL(request.url).origin !== self.location.origin) {
    return;
  }
  // Network-first for HTML navigations; cache-first for others.
  if (request.mode === 'navigate') {
    event.respondWith(
      fetch(request)
        .then((resp) => {
          const copy = resp.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put('/', copy)).catch(() => void 0);
          return resp;
        })
        .catch(() => caches.match('/') || caches.match('/index.html'))
    );
  } else {
    event.respondWith(
      caches.match(request).then((cached) =>
        cached ||
        fetch(request).then((resp) => {
          const copy = resp.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, copy)).catch(() => void 0);
          return resp;
        }).catch(() => cached)
      )
    );
  }
});