const CACHE_NAME = 'listify-shell-v3';
const SHELL_ASSETS = ['/', '/index.html', '/manifest.webmanifest', '/pwa-icon.svg'];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches
      .open(CACHE_NAME)
      .then((cache) => cache.addAll(SHELL_ASSETS))
      .then(() => self.skipWaiting()),
  );
});

self.addEventListener('activate', (event) => {
  event.waitUntil(
    caches
      .keys()
      .then((keys) =>
        Promise.all(keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))),
      )
      .then(() => self.clients.claim()),
  );
});

self.addEventListener('fetch', (event) => {
  const request = event.request;
  const url = new URL(request.url);

  if (url.origin !== self.location.origin || url.pathname.startsWith('/api/')) {
    return;
  }

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

  event.respondWith(
    caches.match(request).then((cached) => {
      if (cached) {
        return cached;
      }

      return fetch(request).then((response) => {
        if (request.method === 'GET' && response.ok) {
          const responseClone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(request, responseClone));
        }

        return response;
      });
    }),
  );
});

self.addEventListener('push', (event) => {
  let payload = {};

  try {
    payload = event.data ? event.data.json() : {};
  } catch {
    payload = {};
  }

  const title = payload.title || 'Listify Tasks';
  const options = {
    body: payload.body || 'Du hast offene Tasks.',
    tag: payload.tag || 'listify-task-digest',
    renotify: true,
    timestamp: Date.now(),
    vibrate: [120, 80, 120],
    icon: '/pwa-icon.svg',
    badge: '/pwa-icon.svg',
    data: {
      url: payload.url || '/tasks',
    },
  };

  event.waitUntil(self.registration.showNotification(title, options));
});

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

  const targetUrl = event.notification.data?.url || '/tasks';
  const absoluteUrl = new URL(targetUrl, self.location.origin).href;

  event.waitUntil(
    self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then((clients) => {
      for (const client of clients) {
        if (client.url === absoluteUrl && 'focus' in client) {
          return client.focus();
        }
      }

      return self.clients.openWindow(absoluteUrl);
    }),
  );
});