sw2.js

const CACHE_NAME = "ghar-manager-v2";
const ASSETS = [
  "./",
  "./index.html",
  "./style.css",
  "./app.js",
  "./manifest.json"
];

/* =========================
   INSTALL
========================= */
self.addEventListener("install", event => {
  self.skipWaiting();
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => cache.addAll(ASSETS))
      .catch(err => console.log("Cache error:", err))
  );
});

/* =========================
   ACTIVATE (Delete old cache)
========================= */
self.addEventListener("activate", event => {
  event.waitUntil(
    caches.keys().then(keys => {
      return Promise.all(
        keys.map(key => {
          if (key !== CACHE_NAME) {
            return caches.delete(key);
          }
        })
      );
    })
  );
  self.clients.claim();
});

/* =========================
   FETCH (Network First + Safe Fallback)
========================= */
self.addEventListener("fetch", event => {
  if (event.request.method !== "GET") return;

  event.respondWith(
    fetch(event.request)
      .then(response => {
        const clone = response.clone();
        caches.open(CACHE_NAME).then(cache => {
          cache.put(event.request, clone);
        });
        return response;
      })
      .catch(() => {
        return caches.match(event.request)
          .then(res => res || caches.match("./index.html"));
      })
  );
});