/**
 * Service Worker für Finanz Flow Mobile PWA
 */

const CACHE_NAME = 'finanz-flow-v1';
const urlsToCache = [
    '/',
    '/index.html',
    '/app.js',
    '/manifest.json',
    '/icon-192.png',
    '/icon-512.png'
];

// Install event - Cache wichtige Dateien
self.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then(cache => {
                console.log('Cache geöffnet');
                return cache.addAll(urlsToCache);
            })
    );
    self.skipWaiting();
});

// Activate event - Alte Caches löschen
self.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(cacheNames => {
            return Promise.all(
                cacheNames.map(cacheName => {
                    if (cacheName !== CACHE_NAME) {
                        console.log('Alter Cache löschen:', cacheName);
                        return caches.delete(cacheName);
                    }
                })
            );
        })
    );
    self.clients.claim();
});

// Fetch event - Cache-first Strategie
self.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request)
            .then(response => {
                // Cache hit - return response
                if (response) {
                    return response;
                }
                return fetch(event.request);
            })
    );
});