sw.js

const CACHE_NAME = "btc-tracker-cache-v1";
const urlsToCache = [
  "/",
  "/index.html",
  "/styles.css", // Add your CSS file path
  "/script.js",  // Add your JavaScript file path
  "/icons/icon-192x192.png",
  "/icons/icon-512x512.png"
];

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

// Fetch resources from cache or network
self.addEventListener("fetch", (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      return response || fetch(event.request);
    })
  );
});

// Update the service worker
self.addEventListener("activate", (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cache) => {
          if (cache !== CACHE_NAME) {
            return caches.delete(cache);
          }
        })
      );
    })
  );
});