sw.js

const CACHE_NAME = 'symbiosis-v5.2';
const urlsToCache = [
  '/',
  '/index.html',
  '/styles.css',
  '/script.js',
  '/icon.png',
  '/manifest.json'
];


// Install service worker
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then((cache) => cache.addAll(urlsToCache))
  );
  self.skipWaiting();
});

// Activate and clean old caches
self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
  self.clients.claim();
});

// Fetch with network-first strategy for API calls, cache-first for static assets
self.addEventListener('fetch', (event) => {
  const url = new URL(event.request.url);

  // Network-first for API calls
  if (url.hostname.includes('finance.yahoo') || url.hostname.includes('allorigins')) {
    event.respondWith(
      fetch(event.request)
        .catch(() => caches.match(event.request))
    );
    return;
  }

  // Cache-first for static assets
  event.respondWith(
    caches.match(event.request)
      .then((response) => {
        if (response) {
          return response;
        }
        return fetch(event.request);
      })
  );
});