'use strict'

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp(functions.config().firebase);

exports.sendNotification = functions.database.ref('/Notifications/{notification_id}').onWrite(event =>
{
    const notification_id = event.params.notification_id;

    if(!event.data.val())
    {
        return console.log('A Notification has been deleted from the database : ', notification_id);
    }

    const notification_data = admin.database().ref('/Notifications/${notification_id}').once('value');

    return notification_data.then(dataResult =>
    {
        const id = dataResult.val().id;
        const about = dataResult.val().about;
        const title = dataResult.val().title;
        const name = dataResult.val().name;
        const date = dataResult.val().date;

        const message =
        {
            data:
            {
                id: '${id}',
                about: '${about}',
                title: '${title}',
                name: '${name}',
                date: '${date}',
                click_action: 'gr.teithe.it.it_app_TARGET_NOTIFICATION'
            },
            topic: 'notifications'
        };

        return admin.messaging().send(message).then(response =>
        {
            console.log('${name} upload an announcement  on ${about}');
        });
    }
});