const CACHE_NAME = 'jama-v1';
const STATIC_ASSETS = ['/'];

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

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

self.addEventListener('fetch', (event) => {
  const url = event.request.url;
  if (url.includes('/api/') || url.includes('/socket.io/') || url.includes('/manifest.json')) {
    return;
  }
  event.respondWith(
    fetch(event.request).catch(() => caches.match(event.request))
  );
});

// Track badge count in SW scope
let badgeCount = 0;

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

  let data = {};
  try { data = event.data.json(); } catch (e) { return; }

  badgeCount++;

  // Update app badge
  if (self.navigator && self.navigator.setAppBadge) {
    self.navigator.setAppBadge(badgeCount).catch(() => {});
  }

  // Check if app is currently visible — if so, skip the notification
  const showNotification = clients.matchAll({
    type: 'window',
    includeUncontrolled: true,
  }).then((clientList) => {
    const appVisible = clientList.some(
      (c) => c.visibilityState === 'visible'
    );
    // Still show if app is open but hidden (minimized), skip only if truly visible
    if (appVisible) return;

    return self.registration.showNotification(data.title || 'New Message', {
      body: data.body || '',
      icon: '/icons/icon-192.png',
      badge: '/icons/icon-192-maskable.png',
      data: { url: data.url || '/' },
      // Use unique tag per group so notifications group by conversation
      tag: data.groupId ? `jama-group-${data.groupId}` : 'jama-message',
      renotify: true,
    });
  });

  event.waitUntil(showNotification);
});

self.addEventListener('notificationclick', (event) => {
  event.notification.close();
  badgeCount = 0;
  if (self.navigator && self.navigator.clearAppBadge) {
    self.navigator.clearAppBadge().catch(() => {});
  }
  event.waitUntil(
    clients.matchAll({ type: 'window', includeUncontrolled: true }).then((clientList) => {
      const url = event.notification.data?.url || '/';
      for (const client of clientList) {
        if (client.url.includes(self.location.origin) && 'focus' in client) {
          client.focus();
          return;
        }
      }
      return clients.openWindow(url);
    })
  );
});

// Clear badge when app signals it
self.addEventListener('message', (event) => {
  if (event.data?.type === 'CLEAR_BADGE') {
    badgeCount = 0;
    if (self.navigator && self.navigator.clearAppBadge) {
      self.navigator.clearAppBadge().catch(() => {});
    }
  }
  if (event.data?.type === 'SET_BADGE') {
    badgeCount = event.data.count || 0;
    if (self.navigator && self.navigator.setAppBadge) {
      if (badgeCount > 0) {
        self.navigator.setAppBadge(badgeCount).catch(() => {});
      } else {
        self.navigator.clearAppBadge().catch(() => {});
      }
    }
  }
});