// public/sw.js
const CACHE_NAME = 'app-cache-v1';
const ASSETS_TO_CACHE = [
    '/',
    '/manifest.json',
    // Add paths to your main CSS and JS files here
    // e.g., '/build/app.css', '/build/app.js'
];

// Install Event: Cache core static assets
self.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE_NAME)
        .then(cache => {
            return cache.addAll(ASSETS_TO_CACHE);
        })
    );
    self.skipWaiting();
});

// Activate Event: Clean up old caches if you change the CACHE_NAME version
self.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return Promise.all(
                cacheNames.map(cache => {
                    if (cache !== CACHE_NAME) {
                        return caches.delete(cache);
                    }
                })
            );
        })
    );
    self.clients.claim();
});

// Fetch Event: Network First, Fallback to Cache
self.addEventListener('fetch', event => {
    // Only cache GET requests
    if (event.request.method !== 'GET') return;

    event.respondWith(
        fetch(event.request)
            .then(networkResponse => {
                // If the network request succeeds, clone it and put it in the cache
                return caches.open(CACHE_NAME).then(cache => {
                    cache.put(event.request, networkResponse.clone());
                    return networkResponse;
                });
            })
            .catch(() => {
                // If the network fails (offline), try to serve from cache
                return caches.match(event.request);
            })
    );
});