init geek calc

service-worker.js

@@ -0,0 +1,57 @@
+// Service Worker for Geek Calculator - enables offline functionality
+
+const CACHE_NAME = 'geek-calculator-v1';
+const urlsToCache = [
+  '/',
+  '/index.html',
+  '/styles.css',
+  '/app.js',
+  '/calculator.js',
+  '/rpn-calculator.js',
+  '/ui.js',
+  '/state.js',
+  '/utils.js',
+  '/manifest.webmanifest'
+];
+
+// Install event - cache resources
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME)
+      .then(cache => {
+        console.log('Opened cache');
+        return cache.addAll(urlsToCache);
+      })
+  );
+});
+
+// Fetch event - serve from cache or network
+self.addEventListener('fetch', event => {
+  event.respondWith(
+    caches.match(event.request)
+      .then(response => {
+        // Return cached version if available, otherwise fetch from network
+        if (response) {
+          return response;
+        }
+        return fetch(event.request);
+      }
+    )
+  );
+});
+
+// Activate event - clean up old caches
+self.addEventListener('activate', event => {
+  event.waitUntil(
+    caches.keys().then(cacheNames => {
+      return Promise.all(
+        cacheNames.map(cacheName => {
+          if (cacheName !== CACHE_NAME) {
+            console.log('Deleting old cache:', cacheName);
+            return caches.delete(cacheName);
+          }
+        })
+      );
+    })
+  );
+});