const CACHE_NAME = 'eur-dzd-calculator-v1';

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(function(cache) {
        return cache.addAll([
          '/index.html',
          '/manifest.json',
          '/icon.png',
          '/style.css',
          '/script.js',
        ]);
      })
  );
});

self.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request)
      .then(function(response) {
        if (response) {
          return response;
        }
        
        let fetchRequest = event.request.clone();

        return fetch(fetchRequest)
          .then(function(response) {
            if (!response || response.status !== 200 || response.type !== 'basic') {
              return response;
            }

            let responseToCache = response.clone();

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

            return response;
          })
          .catch(function(error) {
            console.error('Error fetching and caching:', error);
          });
      })
  );
});