'''
const CACHE_NAME = 'opulent-pos-cache-v1';
const urlsToCache = [
    '/dashboard.php?view=cashier_checkout',
    '/assets/css/custom.css',
    '/assets/js/main.js',
    'https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css',
    'https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.1/font/bootstrap-icons.css'
];

self.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then(cache => {
                console.log('Opened cache');
                // Add all the assets to the cache
                return cache.addAll(urlsToCache);
            })
    );
});

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

                // Clone the request because it's a stream and can only be consumed once.
                const fetchRequest = event.request.clone();

                return fetch(fetchRequest).then(
                    response => {
                        // Check if we received a valid response
                        if (!response || response.status !== 200 || response.type !== 'basic') {
                            return response;
                        }

                        // Clone the response because it also is a stream
                        const responseToCache = response.clone();

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

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

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);
                    }
                })
            );
        })
    );
});
'''