// Minimal service worker: exists only to satisfy PWA installability criteria
// and give a usable offline fallback. Deliberately not a full offline-first
// cache — this app shows live financial data, so navigations always go to
// the network first; only the built Vite assets and the offline page are
// cached, never HTML page content.
const CACHE = 'suivicpt-shell-v1';
const OFFLINE_URL = '/offline.html';

self.addEventListener('install', (event) => {
    event.waitUntil(
        caches.open(CACHE).then((cache) => cache.add(OFFLINE_URL))
    );
    self.skipWaiting();
});

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

self.addEventListener('fetch', (event) => {
    if (event.request.mode !== 'navigate') {
        return;
    }

    event.respondWith(
        fetch(event.request).catch(() => caches.match(OFFLINE_URL))
    );
});