sw.js

const CACHE_NAME = 'workouttrackr-v11';

// Install event - skip waiting to activate immediately
self.addEventListener('install', event => {
  self.skipWaiting();
});

// Activate event - claim clients and clean up old caches
self.addEventListener('activate', event => {
  event.waitUntil(
    Promise.all([
      // Take control of all clients immediately
      self.clients.claim(),
      // Clean up old caches
      caches.keys().then(cacheNames => {
        return Promise.all(
          cacheNames.map(cacheName => {
            if (cacheName !== CACHE_NAME) {
              return caches.delete(cacheName);
            }
          })
        );
      })
    ])
  );
});

// Fetch event - network-first for everything (prioritizes fresh content)
self.addEventListener('fetch', event => {
  event.respondWith(
    fetch(event.request)
      .then(response => {
        // Cache successful responses for offline fallback
        if (response && response.status === 200) {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then(cache => {
            cache.put(event.request, responseClone);
          });
        }
        return response;
      })
      .catch(() => {
        // Network failed - try cache as fallback
        return caches.match(event.request);
      })
  );
});