// Service Worker for PWA
const CACHE_NAME = 'sportbuddy-v1';
const urlsToCache = [
  '/',
  '/manifest.json',
  '/icon-192x192.png',
  '/icon-512x512.png',
];

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

// Fetch from cache
self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      // Cache hit - return response
      if (response) {
        return response;
      }

      return fetch(event.request).then((response) => {
        // Check if valid response
        if (!response || response.status !== 200 || response.type !== 'basic') {
          return response;
        }

        // Clone the response
        const responseToCache = response.clone();

        caches.open(CACHE_NAME).then((cache) => {
          cache.put(event.request, responseToCache);
        });

        return response;
      });
    })
  );
});

// Activate and clean old caches
self.addEventListener('activate', (event) => {
  const cacheWhitelist = [CACHE_NAME];
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});