// public/sw.js

const APP_VERSION = '__APP_VERSION__';
const CACHE_NAME = `timepulse-${APP_VERSION}`;
const filesToCache = [
  '/', '/index.html', '/style/style.css', '/js/main.js', '/js/ui.js',
  '/js/api.js', '/js/utils.js', '/manifest.json',
  '/icons/icon-192x192.webp', '/icons/icon-512x512.webp'
];

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

// --- Activate Event ---
self.addEventListener('activate', event => {
  event.waitUntil(
    caches.keys().then(keys => Promise.all(
      keys.map(key => {
        if (key !== CACHE_NAME) {
          return caches.delete(key);
        }
      })
    ))
  );
  self.clients.claim();
});

// --- Fetch Event ---
self.addEventListener('fetch', event => {
  if (event.request.method !== 'GET' || event.request.url.includes('/api/')) {
    return;
  }

  const url = new URL(event.request.url);

  if (event.request.mode === 'navigate' || url.pathname === '/' || url.pathname.endsWith('/index.html')) {
    event.respondWith(
      fetch(event.request)
        .then(response => {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then(cache => cache.put(event.request, responseClone));
          return response;
        })
        .catch(() => caches.match(event.request))
    );
    return;
  }

  event.respondWith(
    caches.match(event.request).then(cached => {
      const fetchPromise = fetch(event.request).then(response => {
        if (response && response.ok) {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then(cache => cache.put(event.request, responseClone));
        }
        return response;
      });
      return cached || fetchPromise;
    })
  );
});

// --- Push Event (The missing part!) ---
self.addEventListener('push', e => {
  try {
    const data = e.data.json();
    self.registration.showNotification(data.title, {
      body: data.body,
      icon: '/icons/icon-192x192.webp'
    });
  } catch (error) {
    console.error('Error in push event:', error);
    self.registration.showNotification('New Notification', {
      body: 'You have a new update.'
    });
  }
});