sw.js

// Service Worker for Bird Watcher PWA

const CACHE_NAME = 'birdwatcher-v16';

const STATIC_ASSETS = [
  '/',
  '/index.html',
  '/style.css',
  '/src/app.js',
  '/src/config.js',
  '/src/camera.js',
  '/src/motion-detector.js',
  '/src/bird-detector.js',
  '/src/recorder.js',
  '/src/storage.js',
  '/src/ui.js',
  '/manifest.json',
  '/icons/icon-192.png',
  '/icons/icon-512.png',
  '/icons/favicon.ico',
];

// Install event - cache static assets
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      console.log('Caching static assets');
      return cache.addAll(STATIC_ASSETS);
    })
  );
  // Activate immediately
  self.skipWaiting();
});

// Activate event - clean up old caches
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames
          .filter((name) => name !== CACHE_NAME)
          .map((name) => caches.delete(name))
      );
    })
  );
  // Claim clients immediately
  self.clients.claim();
});

// Fetch event - serve from cache, fallback to network
self.addEventListener('fetch', (event) => {
  // Skip non-GET requests
  if (event.request.method !== 'GET') {
    return;
  }

  // Skip CDN requests (TensorFlow.js)
  if (event.request.url.includes('cdn.jsdelivr.net') ||
      event.request.url.includes('unpkg.com') ||
      event.request.url.includes('tfhub.dev')) {
    return;
  }

  event.respondWith(
    fetch(event.request)
      .then((response) => {
        // Got network response - cache it and return
        if (response && response.status === 200) {
          const responseToCache = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(event.request, responseToCache);
          });
        }
        return response;
      })
      .catch(() => {
        // Network failed - fall back to cache (offline support)
        return caches.match(event.request);
      })
  );
});