// Service worker: only shows push notifications. It deliberately caches
// nothing, so the app always loads fresh from the server.
self.addEventListener("install", () => self.skipWaiting());
self.addEventListener("activate", event => event.waitUntil(self.clients.claim()));

self.addEventListener("push", event => {
  let message = { title: "Flowtrack", body: "" };
  try {
    message = { ...message, ...event.data.json() };
  } catch {
    // An empty or unreadable push still has to show something on iOS.
  }
  event.waitUntil(self.registration.showNotification(message.title, {
    body: message.body,
    icon: "/icon-192.png",
    badge: "/icon-192.png",
    tag: message.tag,
    data: { url: message.url || "/" }
  }));
});

self.addEventListener("notificationclick", event => {
  event.notification.close();
  event.waitUntil((async () => {
    const windows = await self.clients.matchAll({ type: "window", includeUncontrolled: true });
    if (windows.length) return windows[0].focus();
    return self.clients.openWindow(event.notification.data.url);
  })());
});