// MacroPad PWA Service Worker
const CACHE_NAME = 'macropad-v3';
const ASSETS_TO_CACHE = [
    '/',
    '/static/css/styles.css',
    '/static/js/app.js',
    '/static/icons/icon-192.png',
    '/static/icons/icon-512.png',
    '/manifest.json'
];

// Install event - cache assets
self.addEventListener('install', (event) => {
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then((cache) => {
                console.log('Caching app assets');
                return cache.addAll(ASSETS_TO_CACHE);
            })
            .then(() => self.skipWaiting())
    );
});

// Activate event - clean old caches
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())
    );
});

// Fetch event - serve from cache, fallback to network
self.addEventListener('fetch', (event) => {
    const url = new URL(event.request.url);

    // Always fetch API requests from network
    if (url.pathname.startsWith('/api/') || url.pathname.startsWith('/ws')) {
        event.respondWith(fetch(event.request));
        return;
    }

    // For other requests, try cache first, then network
    event.respondWith(
        caches.match(event.request)
            .then((response) => {
                if (response) {
                    return response;
                }
                return fetch(event.request).then((networkResponse) => {
                    // Cache successful responses
                    if (networkResponse && networkResponse.status === 200) {
                        const responseClone = networkResponse.clone();
                        caches.open(CACHE_NAME).then((cache) => {
                            cache.put(event.request, responseClone);
                        });
                    }
                    return networkResponse;
                });
            })
            .catch(() => {
                // Return offline fallback for navigation requests
                if (event.request.mode === 'navigate') {
                    return caches.match('/');
                }
            })
    );
});