// Bambuddy Service Worker
const CACHE_NAME = 'bambuddy-v4';
const STATIC_CACHE = 'bambuddy-static-v4';

// Static assets to cache on install
const STATIC_ASSETS = [
  '/',
  '/manifest.json',
  '/img/favicon.png',
  '/img/favicon-16x16.png',
  '/img/favicon-32x32.png',
  '/img/android-chrome-192x192.png',
  '/img/android-chrome-512x512.png',
  '/img/apple-touch-icon.png',
  '/img/bambuddy_logo_dark.png',
];

// Install event - cache static assets
self.addEventListener('install', (event) => {
  console.log('[SW] Installing service worker...');
  event.waitUntil(
    caches.open(STATIC_CACHE).then((cache) => {
      console.log('[SW] Caching static assets');
      return cache.addAll(STATIC_ASSETS);
    })
  );
  // Activate immediately
  self.skipWaiting();
});

// Activate event - clean up old caches
self.addEventListener('activate', (event) => {
  console.log('[SW] Activating service worker...');
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames
          .filter((name) => name !== CACHE_NAME && name !== STATIC_CACHE)
          .map((name) => {
            console.log('[SW] Deleting old cache:', name);
            return caches.delete(name);
          })
      );
    })
  );
  // Take control immediately
  self.clients.claim();
});

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

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

  // Skip WebSocket connections
  if (url.protocol === 'ws:' || url.protocol === 'wss:') {
    return;
  }

  // API requests - network first, no cache (real-time data is critical)
  if (url.pathname.startsWith('/api/')) {
    event.respondWith(
      fetch(request).catch(() => {
        // Return offline response for API failures
        return new Response(
          JSON.stringify({ error: 'offline', message: 'You are currently offline' }),
          {
            status: 503,
            headers: { 'Content-Type': 'application/json' },
          }
        );
      })
    );
    return;
  }

  // Static assets - cache first, then network
  if (
    url.pathname.startsWith('/img/') ||
    url.pathname.startsWith('/icons/') ||
    url.pathname.endsWith('.png') ||
    url.pathname.endsWith('.jpg') ||
    url.pathname.endsWith('.svg') ||
    url.pathname.endsWith('.ico')
  ) {
    event.respondWith(
      caches.match(request).then((cached) => {
        if (cached) {
          return cached;
        }
        return fetch(request).then((response) => {
          // Cache successful responses
          if (response.ok) {
            const clone = response.clone();
            caches.open(STATIC_CACHE).then((cache) => {
              cache.put(request, clone);
            });
          }
          return response;
        });
      })
    );
    return;
  }

  // JS/CSS assets - stale-while-revalidate
  if (
    url.pathname.startsWith('/assets/') ||
    url.pathname.endsWith('.js') ||
    url.pathname.endsWith('.css')
  ) {
    event.respondWith(
      caches.match(request).then((cached) => {
        const fetchPromise = fetch(request).then((response) => {
          if (response.ok) {
            const clone = response.clone();
            caches.open(CACHE_NAME).then((cache) => {
              cache.put(request, clone);
            });
          }
          return response;
        });
        return cached || fetchPromise;
      })
    );
    return;
  }

  // HTML pages - network first, fall back to cache
  event.respondWith(
    fetch(request)
      .then((response) => {
        if (response.ok) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then((cache) => {
            cache.put(request, clone);
          });
        }
        return response;
      })
      .catch(() => {
        return caches.match(request).then((cached) => {
          if (cached) {
            return cached;
          }
          // Return cached index for SPA navigation
          return caches.match('/');
        });
      })
  );
});

// Handle push notifications (for future use)
self.addEventListener('push', (event) => {
  if (!event.data) return;

  const data = event.data.json();
  const options = {
    body: data.body || 'New notification from Bambuddy',
    icon: '/img/android-chrome-192x192.png',
    badge: '/img/favicon-32x32.png',
    vibrate: [100, 50, 100],
    data: {
      url: data.url || '/',
    },
  };

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

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

  const url = event.notification.data?.url || '/';

  event.waitUntil(
    clients.matchAll({ type: 'window', includeUncontrolled: true }).then((windowClients) => {
      // Check if there's already a window open
      for (const client of windowClients) {
        if (client.url.includes(self.location.origin) && 'focus' in client) {
          client.navigate(url);
          return client.focus();
        }
      }
      // Open a new window if none exists
      if (clients.openWindow) {
        return clients.openWindow(url);
      }
    })
  );
});