// Beszel Service Worker
const CACHE_NAME = 'beszel-v1';
const STATIC_ASSETS = [
  '/',
  '/index.html',
  '/manifest.json',
  '/favicon.ico',
  '/favicon.svg',
];

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

// Activate event - clean up 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 or network
self.addEventListener('fetch', (event) => {
  const { request } = event;
  const url = new URL(request.url);

  // Skip non-GET requests
  if (request.method !== 'GET') {
    return;
  }

  // Skip API requests
  if (url.pathname.startsWith('/api/')) {
    return;
  }

  // Skip PocketBase API
  if (url.pathname.startsWith('/_/')) {
    return;
  }

  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) {
        // Return cached version and update in background
        fetch(request).then((response) => {
          if (response.ok) {
            caches.open(CACHE_NAME).then((cache) => {
              cache.put(request, response);
            });
          }
        });
        return cached;
      }

      // Fetch from network
      return fetch(request).then((response) => {
        if (!response || response.status !== 200 || response.type !== 'basic') {
          return response;
        }

        const responseToCache = response.clone();
        caches.open(CACHE_NAME).then((cache) => {
          cache.put(request, responseToCache);
        });

        return response;
      });
    }).catch(() => {
      // Return offline page if available
      return caches.match('/offline.html');
    })
  );
});

// Push notification event
self.addEventListener('push', (event) => {
  if (!event.data) {
    return;
  }

  const data = event.data.json();
  const options = {
    body: data.body || 'New notification',
    icon: data.icon || '/favicon-192x192.png',
    badge: data.badge || '/favicon-72x72.png',
    tag: data.tag || 'default',
    requireInteraction: data.requireInteraction || false,
    data: data.data || {},
    actions: data.actions || [
      { action: 'open', title: 'Open' },
      { action: 'close', title: 'Dismiss' }
    ]
  };

  event.waitUntil(
    self.registration.showNotification(
      data.title || 'Beszel Alert',
      options
    )
  );
});

// Notification click event
self.addEventListener('notificationclick', (event) => {
  event.notification.close();

  const { action, data } = event.notification;
  const urlToOpen = data?.url || '/';

  event.waitUntil(
    clients.matchAll({ type: 'window', includeUncontrolled: true })
      .then((clientList) => {
        // Check if there's already a window open
        for (const client of clientList) {
          if (client.url === urlToOpen && 'focus' in client) {
            return client.focus();
          }
        }
        
        // Open new window if not found
        if (clients.openWindow) {
          return clients.openWindow(urlToOpen);
        }
      })
  );
});

// Background sync for offline support
self.addEventListener('sync', (event) => {
  if (event.tag === 'background-sync') {
    event.waitUntil(doBackgroundSync());
  }
});

async function doBackgroundSync() {
  // Retry any pending API requests stored in IndexedDB
  // This is a placeholder - implement with actual pending request logic
  console.log('Background sync executed');
}

// Periodic background sync (if supported)
self.addEventListener('periodicsync', (event) => {
  if (event.tag === 'update-check') {
    event.waitUntil(checkForUpdates());
  }
});

async function checkForUpdates() {
  // Check for new data and show notifications if needed
  console.log('Periodic sync executed');
}