/* public/service-worker.js

   Listens to 'push' events and shows a notification.
   This file MUST be served via HTTPS or on localhost.
*/

self.addEventListener('push', function(event) {
    if (!event.data) {
        return;
    }
    const payload = event.data.json(); // {title, body}
    const title = payload.title || 'Timer Notification';
    const body = payload.body || 'Time is up!';

    const options = {
        body: body,
        icon: '/icon.png',  // optional
        badge: '/badge.png' // optional
        // any other notification options
    };

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

// Handle notification click
self.addEventListener('notificationclick', function(event) {
    event.notification.close();
    // Focus or open the site
    event.waitUntil(
        clients.matchAll({ type:'window' }).then( windowClients => {
            // if we already have a window open, focus it
            for (let client of windowClients) {
                if (client.url.includes('/PointTracker') && 'focus' in client) {
                    return client.focus();
                }
            }
            // otherwise, open a new one
            if (clients.openWindow) {
                return clients.openWindow('/');
            }
        })
    );
});