// Service Worker for FlockRadar Offline Driving & Caching
const CACHE_NAME = 'flockradar-v2';
const ASSETS_TO_CACHE = [
  './',
  './index.html',
  './css/styles.css',
  './js/app.js',
  './js/auth.js',
  './js/radar.js',
  './data/portals.js',
  './manifest.json'
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(ASSETS_TO_CACHE))
  );
  self.skipWaiting();
});

self.addEventListener('activate', event => {
  event.waitUntil(
    caches.keys().then(keys => Promise.all(
      keys.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))
    ))
  );
  self.clients.claim();
});

self.addEventListener('fetch', event => {
  // Network first, fallback to cache
  event.respondWith(
    fetch(event.request).catch(() => caches.match(event.request))
  );
});