service-worker.js

const CACHE_VERSION = 'scout-v1';
const CACHE_NAME = `${CACHE_VERSION}`;

// Files to cache on install
const urlsToCache = [
  './',
  './logIn.html',
  './auto.html',
  './game.html',
  './Func.js',
  './manifest.json',
  './icons/icon-192.png',
  './icons/icon-512.png'
];

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

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

// Fetch event - cache-first strategy
self.addEventListener('fetch', event => {
  // Only handle GET requests
  if (event.request.method !== 'GET') {
    return;
  }

  event.respondWith(
    caches.match(event.request)
      .then(response => {
        // Return cached version if available
        if (response) {
          return response;
        }

        // Otherwise, try to fetch from network
        return fetch(event.request)
          .then(response => {
            // Don't cache non-successful responses
            if (!response || response.status !== 200 || response.type === 'error') {
              return response;
            }

            // Clone the response before caching
            const responseToCache = response.clone();
            caches.open(CACHE_NAME)
              .then(cache => {
                cache.put(event.request, responseToCache);
              });

            return response;
          })
          .catch(err => {
            console.error('Fetch failed:', err);
            // Return offline page if needed
            return caches.match('./logIn.html');
          });
      })
  );
});