const CACHE_NAME = 'leibovitz-cache-v1';
const urlsToCache = [
    '/',
    './',
    'index.html',
    'leibovitz.js',
    'blur.js',
    'contrast.js',
    'color.js',
    'balance.js',
    'dither.js',
    'service-worker.js',
    'ChicagoFLF.ttf',
    'manifest.json',
    // Icons
    'android-icon-192x192.png',
    'android-icon-512x512.png',
    'favicon.ico',
    'favicon-16x16.png',
    'favicon-32x32.png',
    'favicon-96x96.png',
    'apple-icon-57x57.png',
    'apple-icon-60x60.png',
    'apple-icon-72x72.png',
    'apple-icon-76x76.png',
    'apple-icon-114x114.png',
    'apple-icon-120x120.png',
    'apple-icon-144x144.png',
    'apple-icon-152x152.png'
];

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

// 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) {
                        return caches.delete(cacheName);
                    }
                })
            );
        })
    );
});

// Fetch event - serve from cache, fallback to network
self.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request)
            .then(response => {
                // Return cached response if found
                if (response) {
                    return response;
                }
                
                // Clone the request because it can only be used once
                const fetchRequest = event.request.clone();
                
                // Try to fetch from network
                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 can only be used once
                    const responseToCache = response.clone();
                    
                    // Cache the fetched response
                    caches.open(CACHE_NAME)
                        .then(cache => {
                            cache.put(event.request, responseToCache);
                        });
                    
                    return response;
                });
            })
    );
});