self.addEventListener('push', function (event) {
    if (!(self.Notification && self.Notification.permission === 'granted')) {
        return;
    }

    let data = {};
    if (event.data) {
        try {
            data = event.data.json();
        } catch (e) {
            data = { title: 'QuitTraq', body: event.data.text() };
        }
    }

    const title = data.title || 'QuitTraq Update';
    const options = {
        body: data.body || 'Check in on your progress!',
        icon: '/icon-192.png',
        badge: '/icon-192.png',
        tag: data.tag || 'generic-notification',
        data: data.data || {},
        requireInteraction: true
    };

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

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

    // This looks to see if the current is already open and focuses if it is
    event.waitUntil(
        clients.matchAll({
            type: "window"
        })
            .then(function (clientList) {
                for (var i = 0; i < clientList.length; i++) {
                    var client = clientList[i];
                    if (client.url == '/' && 'focus' in client)
                        return client.focus();
                }
                if (clients.openWindow) {
                    return clients.openWindow('/');
                }
            })
    );
});