sw.js

/* ═══════════════════════════════════════════════
   sw.js — NoteOS Service Worker
   Cache-first for app shell assets.
   Notes data lives in localStorage — always available offline.
═══════════════════════════════════════════════ */
'use strict';

const CACHE  = 'noteos-v1';
const ASSETS = [
  './',
  './index.html',
  './css/style.css',
  './js/app.js',
  './manifest.json',
  'https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap',
];

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

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();
});

self.addEventListener('fetch', e => {
  if (e.request.method !== 'GET') return;
  e.respondWith(
    caches.match(e.request).then(cached => {
      if (cached) return cached;
      return fetch(e.request).then(res => {
        const clone = res.clone();
        caches.open(CACHE).then(c => c.put(e.request, clone));
        return res;
      }).catch(() => {
        if (e.request.headers.get('accept')?.includes('text/html')) {
          return caches.match('./index.html');
        }
      });
    })
  );
});