// Service Worker für iPhone Notifications
const CACHE_NAME = 'ninjacross-v1';
const urlsToCache = [
    '/',
    '/test-push.html',
    '/sw.js'
];

// Install event
self.addEventListener('install', function(event) {
    console.log('Service Worker installing...');
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then(function(cache) {
                // Add files one by one to handle failures gracefully
                return Promise.allSettled(
                    urlsToCache.map(url => 
                        cache.add(url).catch(err => {
                            console.warn(`Failed to cache ${url}:`, err);
                            return null; // Continue with other files
                        })
                    )
                );
            })
            .then(() => {
                console.log('Service Worker installation completed');
                // Skip waiting to activate immediately
                return self.skipWaiting();
            })
            .catch(err => {
                console.error('Service Worker installation failed:', err);
                // Still try to skip waiting
                return self.skipWaiting();
            })
    );
});

// Activate event
self.addEventListener('activate', function(event) {
    console.log('Service Worker activating...');
    event.waitUntil(
        caches.keys().then(function(cacheNames) {
            return Promise.all(
                cacheNames.map(function(cacheName) {
                    if (cacheName !== CACHE_NAME) {
                        return caches.delete(cacheName);
                    }
                })
            );
        }).then(() => {
            // Take control of all clients immediately
            return self.clients.claim();
        })
    );
});

// Listen for skip waiting message
self.addEventListener('message', function(event) {
    if (event.data && event.data.type === 'SKIP_WAITING') {
        self.skipWaiting();
    }
});

// Fetch event
self.addEventListener('fetch', function(event) {
    event.respondWith(
        caches.match(event.request)
            .then(function(response) {
                // Return cached version or fetch from network
                return response || fetch(event.request);
            }
        )
    );
});

// Push event (für iPhone Notifications)
self.addEventListener('push', function(event) {
    console.log('Push received:', event);
    
    const options = {
        body: 'Du hast eine neue Notification!',
        icon: '/pictures/icon-192.png',
        badge: '/pictures/icon-192.png',
        vibrate: [100, 50, 100],
        data: {
            dateOfArrival: Date.now(),
            primaryKey: 1
        },
        actions: [
            {
                action: 'explore',
                title: 'Dashboard öffnen',
                icon: '/pictures/icon-192.png'
            },
            {
                action: 'close',
                title: 'Schließen',
                icon: '/pictures/icon-192.png'
            }
        ]
    };
    
    if (event.data) {
        const data = event.data.json();
        options.body = data.body || options.body;
        options.title = data.title || 'Ninja Cross';
    }
    
    event.waitUntil(
        self.registration.showNotification('Ninja Cross', options)
    );
});

// Notification click event
self.addEventListener('notificationclick', function(event) {
    console.log('Notification clicked:', event);
    
    event.notification.close();
    
    if (event.action === 'explore') {
        event.waitUntil(
            clients.openWindow('/dashboard.html')
        );
    }
});

// Background sync (für offline functionality)
self.addEventListener('sync', function(event) {
    if (event.tag === 'background-sync') {
        event.waitUntil(doBackgroundSync());
    }
});

async function doBackgroundSync() {
    // Sync data when back online
    console.log('Background sync triggered');
}