const CACHE_NAME = 'whisky-vault-v3'; // Increment version to apply new strategy
const ASSETS_TO_CACHE = [
    '/manifest.json',
    '/icon-192.png',
    '/icon-512.png',
    '/favicon.ico',
];

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

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

// Helper for Network-First with Timeout
function fetchWithTimeout(request, timeoutMs = 3000) {
    return new Promise((resolve, reject) => {
        const timeoutId = setTimeout(() => {
            reject(new Error('Network timeout'));
        }, timeoutMs);

        fetch(request).then(
            (response) => {
                clearTimeout(timeoutId);
                resolve(response);
            },
            (err) => {
                clearTimeout(timeoutId);
                reject(err);
            }
        );
    });
}

self.addEventListener('fetch', (event) => {
    const url = new URL(event.request.url);

    // CRITICAL: Always bypass cache for auth, api, and supabase requests
    const isAuthRequest = url.pathname.includes('/auth/') ||
        url.pathname.includes('/v1/auth/') ||
        url.pathname.includes('/v1/token');
    const isApiRequest = url.pathname.includes('/api/');
    const isSupabaseRequest = url.hostname.includes('supabase.co');

    if (isAuthRequest || isApiRequest || isSupabaseRequest) {
        return;
    }

    // 1. ASSETS & APP SHELL: Stale-While-Revalidate
    const isAsset = event.request.destination === 'style' ||
        event.request.destination === 'script' ||
        event.request.destination === 'worker' ||
        event.request.destination === 'font' ||
        event.request.destination === 'image' ||
        url.pathname.startsWith('/_next/static');

    if (isAsset) {
        event.respondWith(
            caches.match(event.request).then((cachedResponse) => {
                const fetchPromise = fetch(event.request).then((networkResponse) => {
                    if (networkResponse && networkResponse.status === 200) {
                        const responseClone = networkResponse.clone();
                        caches.open(CACHE_NAME).then((cache) => {
                            cache.put(event.request, responseClone);
                        });
                    }
                    return networkResponse;
                });
                return cachedResponse || fetchPromise;
            })
        );
        return;
    }

    // 2. NAVIGATION: Network-First with 3s Timeout
    if (event.request.mode === 'navigate') {
        event.respondWith(
            fetchWithTimeout(event.request, 3000)
                .catch(() => {
                    console.log('[SW] Navigation network failure or timeout, falling back to cache');
                    return caches.match(event.request);
                })
        );
        return;
    }

    // Default: Network-Only or default fetch
    return;
});