const CACHE_NAME = 'dgray-v50';
const STATIC_ASSETS = [
    '/',
    '/index.html',
    '/favicon.png',
    '/manifest.json',

    // CSS
    '/css/components.css',
    '/css/animate.custom.css',
    '/css/vendor/cropper.min.css',

    // Core JS
    '/js/app.js',
    '/js/router.js',
    '/js/i18n.js',
    '/js/utils/helpers.js',

    // Services
    '/js/services/directus.js',
    '/js/services/auth.js',
    '/js/services/listings.js',
    '/js/services/categories.js',
    '/js/services/locations.js',
    '/js/services/conversations.js',
    '/js/services/crypto.js',
    '/js/services/currency.js',
    '/js/services/pow-captcha.js',
    '/js/services/btcpay.js',
    '/js/services/favorites.js',
    '/js/services/notifications.js',

    // Components
    '/js/components/app-shell.js',
    '/js/components/app-header.js',
    '/js/components/app-footer.js',
    '/js/components/auth-modal.js',
    '/js/components/chat-widget.js',
    '/js/components/listing-card.js',
    '/js/components/skeleton-card.js',
    '/js/components/search-box.js',
    '/js/components/error-boundary.js',
    '/js/components/image-cropper.js',
    '/js/components/location-picker.js',
    '/js/components/location-map.js',
    '/js/components/pow-captcha.js',

    // Pages (critical only — lazy-loaded pages are runtime-cached via stale-while-revalidate)
    '/js/components/pages/page-home.js',
    '/js/components/pages/page-not-found.js',

    // Vendor
    '/js/vendor/cropper.min.js',
    '/js/vendor/nacl-fast.min.js',
    '/js/vendor/nacl-util.min.js',

    // Locales
    '/locales/de.json',
    '/locales/en.json',
    '/locales/fr.json',
    '/locales/it.json',
    '/locales/es.json',
    '/locales/pt.json',
    '/locales/ru.json',

    // Fonts
    '/assets/fonts/Inter-Regular.woff2',
    '/assets/fonts/Inter-Medium.woff2',
    '/assets/fonts/Inter-SemiBold.woff2',
    '/assets/fonts/Inter-Bold.woff2',
    '/assets/fonts/SpaceGrotesk-Medium.woff2',
    '/assets/fonts/SpaceGrotesk-Bold.woff2'
];

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

self.addEventListener('activate', (event) => {
    event.waitUntil(
        caches.keys()
            .then((cacheNames) => {
                return Promise.all(
                    cacheNames
                        .filter((name) => name !== CACHE_NAME)
                        .map((name) => caches.delete(name))
                );
            })
            .then(() => self.clients.claim())
    );
});

self.addEventListener('fetch', (event) => {
    const { request } = event;
    const url = new URL(request.url);
    
    if (request.method !== 'GET') return;
    
    // API calls: Network First (external API domain)
    if (url.hostname === 'api.dgray.io') {
        event.respondWith(networkFirst(request));
        return;
    }
    
    // Legacy: API calls via path
    if (url.pathname.includes('/api/')) {
        event.respondWith(networkFirst(request));
        return;
    }
    
    // HTML and JS: Stale-While-Revalidate (show cached, update in background)
    if (url.pathname.endsWith('.html') || url.pathname.endsWith('.js') || url.pathname === '/') {
        event.respondWith(staleWhileRevalidate(request));
        return;
    }
    
    // Everything else: Cache First
    event.respondWith(cacheFirst(request));
});

async function cacheFirst(request) {
    const cached = await caches.match(request);
    if (cached) return cached;
    
    try {
        const response = await fetch(request);
        if (response.ok) {
            const cache = await caches.open(CACHE_NAME);
            cache.put(request, response.clone());
        }
        return response;
    } catch {
        return new Response('Offline', { status: 503 });
    }
}

async function networkFirst(request) {
    try {
        const response = await fetch(request);
        if (response.ok) {
            const cache = await caches.open(CACHE_NAME);
            cache.put(request, response.clone());
        }
        return response;
    } catch {
        const cached = await caches.match(request);
        if (cached) return cached;
        return new Response(JSON.stringify({ error: 'Offline' }), {
            status: 503,
            headers: { 'Content-Type': 'application/json' }
        });
    }
}

async function staleWhileRevalidate(request) {
    const cache = await caches.open(CACHE_NAME);
    const cached = await cache.match(request);
    
    const fetchPromise = fetch(request).then((response) => {
        if (response.ok) {
            cache.put(request, response.clone());
        }
        return response;
    }).catch(() => cached || new Response('Offline', { status: 503 }));
    
    return cached || fetchPromise;
}