// Service Worker for NeuroMorph Gallery PWA
const CACHE_NAME = 'neuromorph-gallery-v1.0.0';
const urlsToCache = [
    '/',
    '/style.css',
    '/script.js',
    '/components/navbar.js',
    '/components/footer.js',
    '/components/artwork-card.js',
    '/gallery.html',
    '/upload.html',
    '/manifest.json'
];

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

// Activate event
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
self.addEventListener('fetch', (event) => {
    event.respondWith(
        caches.match(event.request)
            .then((response) => {
                // Return cached version or fetch from network
                return response || fetch(event.request);
            })
    );
});

// Background sync for offline uploads
self.addEventListener('sync', (event) => {
    if (event.tag === 'background-upload') {
        event.waitUntil(doBackgroundUpload());
    }
});

async function doBackgroundUpload() {
    // Handle background uploads when connection is restored
    const db = await openDB();
    const pendingUploads = await db.getAll('pendingUploads');
    
    for (const upload of pendingUploads) {
        try {
            await fetch('/api/upload', {
                method: 'POST',
                body: upload.data
            });
            await db.delete('pendingUploads', upload.id);
        } catch (error) {
            console.error('Background upload failed:', error);
        }
    }
}

// IndexedDB for offline storage
function openDB() {
    return new Promise((resolve, reject) => {
        const request = indexedDB.open('NeuroMorphGallery', 1);
        
        request.onerror = () => reject(request.error);
        request.onsuccess = () => resolve(request.result);
        
        request.onupgradeneeded = (event) => {
            const db = event.target.result;
            
            // Create object store for artworks
            if (!db.objectStoreNames.contains('artworks')) {
                const store = db.createObjectStore('artworks', { keyPath: 'id' });
            store.createIndex('title', 'title', { unique: false });
            store.createIndex('artist', 'artist.name', { unique: false });
        };
    });
}