const CACHE_NAME = 'nexus-timer-cache-v3'; // Increment cache version
const URLS_TO_CACHE = [
    'index.html',
    'style.css',
    'script.js',
    'manifest.json',
    'assets/default-avatar.svg',
    // MP3 files removed as they are no longer used
    'assets/icon-192x192.png',
    'assets/icon-512x512.png'
];

self.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then(cache => {
                console.log('Opened cache');
                return cache.addAll(URLS_TO_CACHE);
            })
    );
});

self.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request)
            .then(response => {
                if (response) {
                    return response;
                }
                return fetch(event.request);
            }
        )
    );
});

self.addEventListener('activate', event => {
    const cacheWhitelist = [CACHE_NAME];
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return Promise.all(
                cacheNames.map(cacheName => {
                    if (cacheWhitelist.indexOf(cacheName) === -1) {
                        console.log('Deleting old cache:', cacheName);
                        return caches.delete(cacheName);
                    }
                })
            );
        })
    );
});