self.addEventListener('install', () => self.skipWaiting());
self.addEventListener('activate', (event) => event.waitUntil(self.clients.claim()));

async function broadcastToClients(payload) {
  const clients = await self.clients.matchAll({ type: 'window', includeUncontrolled: true });
  clients.forEach((client) => {
    client.postMessage({
      type: 'SHINE_WEB_PUSH_EVENT',
      payload,
    });
  });
}

self.addEventListener('push', (event) => {
  let body = '';
  let rawText = '';
  let kind = '';
  let fromLogin = '';
  let title = '';
  try {
    if (event.data) {
      const text = event.data.text();
      rawText = text || '';
      try {
        const json = JSON.parse(rawText || '{}');
        kind = String(json.kind || '');
        title = String(json.title || '');
        body = String(json.text || '');
        fromLogin = String(json.fromLogin || '');
      } catch {
        body = rawText || '';
      }
    }
  } catch {
    // ignore
  }

  const shouldNotify = kind === 'new_message' || kind === 'test_push' || (!kind && body);
  const notificationTitle = kind === 'test_push'
    ? (title || 'SHiNE: тестовый push')
    : 'SHiNE: входящее сообщение';
  const notifyPromise = shouldNotify
    ? self.registration.showNotification(notificationTitle, {
      body: body || (fromLogin ? `Вам пришло сообщение от ${fromLogin}` : 'Вам пришло сообщение'),
      tag: kind === 'test_push' ? 'shine-test-push' : 'shine-direct-message',
      renotify: true,
    })
    : Promise.resolve();

  event.waitUntil(Promise.all([
    notifyPromise,
    broadcastToClients({
      kind,
      body,
      fromLogin,
      rawText,
      receivedAt: Date.now(),
    }),
  ]));
});

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

  event.waitUntil((async () => {
    const allClients = await self.clients.matchAll({ type: 'window', includeUncontrolled: true });
    const existing = allClients.find((client) => {
      try {
        return client.url.includes('/index.html') || client.url.endsWith('/');
      } catch {
        return false;
      }
    });

    if (existing) {
      await existing.focus();
      return;
    }

    await self.clients.openWindow('./index.html');
  })());
});