sw.js

const CACHE_NAME = 'bluetooth-scanner-v1';
const ASSETS_TO_CACHE = [
    '/',
    '/index.html',
    '/styles.css',
    '/app.js',
    '/manifest.json',
    '/icon-192.png',
    '/icon-512.png'
];

self.addEventListener('install', (event) => {
    console.log('Service Worker: Installing...');
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then((cache) => {
                console.log('Service Worker: Caching files');
                return cache.addAll(ASSETS_TO_CACHE);
            })
            .catch((err) => {
                console.error('Service Worker: Cache failed', err);
            })
    );
    self.skipWaiting();
});

self.addEventListener('activate', (event) => {
    console.log('Service Worker: Activating...');
    event.waitUntil(
        caches.keys().then((cacheNames) => {
            return Promise.all(
                cacheNames.map((cache) => {
                    if (cache !== CACHE_NAME) {
                        console.log('Service Worker: Clearing old cache');
                        return caches.delete(cache);
                    }
                })
            );
        })
    );
    return self.clients.claim();
});

self.addEventListener('fetch', (event) => {
    event.respondWith(
        caches.match(event.request)
            .then((response) => {
                return response || fetch(event.request)
                    .then((fetchResponse) => {
                        return caches.open(CACHE_NAME).then((cache) => {
                            cache.put(event.request, fetchResponse.clone());
                            return fetchResponse;
                        });
                    });
            })
            .catch(() => {
                return caches.match('/index.html');
            })
    );
});