// KOL Manager Service Worker
// Provides basic offline support and caches static assets

const CACHE_NAME = 'kol-manager-v1';
const STATIC_ASSETS = [
    '/',
    '/manifest.json',
];

// Install — pre-cache shell
self.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE_NAME).then(cache => cache.addAll(STATIC_ASSETS))
    );
    self.skipWaiting();
});

// Activate — clean up old caches
self.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(keys =>
            Promise.all(keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k)))
        )
    );
    self.clients.claim();
});

// Fetch — network-first for HTML/API, cache-first for static assets
self.addEventListener('fetch', event => {
    const { request } = event;
    const url = new URL(request.url);

    // Skip non-GET and cross-origin requests
    if (request.method !== 'GET' || url.origin !== location.origin) return;

    // Cache-first for Vite build assets (hashed filenames)
    if (url.pathname.startsWith('/build/')) {
        event.respondWith(
            caches.match(request).then(cached => cached || fetch(request).then(response => {
                const clone = response.clone();
                caches.open(CACHE_NAME).then(cache => cache.put(request, clone));
                return response;
            }))
        );
        return;
    }

    // Network-first for everything else (app routes)
    event.respondWith(
        fetch(request)
            .then(response => {
                // Cache successful HTML responses
                if (response.ok && request.headers.get('Accept')?.includes('text/html')) {
                    const clone = response.clone();
                    caches.open(CACHE_NAME).then(cache => cache.put(request, clone));
                }
                return response;
            })
            .catch(() => caches.match(request))
    );
});