const updateFromTam = async (courses) =>
{
    const currentCourses = await getCurrentCourses();

    for (let [id, course] of Object.entries(currentCourses))
    {
        if (!(id in courses))
        {
            course.arrivalTime = now() + course.eta;
            console.log(`${displayNow(now())} - New course ${id} @ ${course.line} departing from stop ${course.stop} at ${displayNow(course.arrivalTime)}`);
            courses[id] = course;
        }
        else
        {
            course.arrivalTime = now() + course.eta;
            console.log(`${displayNow(now())} - Course ${id} @ ${course.line} will arrive to stop ${course.stop} at ${displayNow(course.arrivalTime)} (previously to stop ${courses[id].stop} at ${displayNow(courses[id].arrivalTime)})`);
            courses[id] = course;
        }
    }
};

const sleep = time => new Promise(res => setTimeout(res, time));
const courses = {};

const loop = async (courses = {}) =>
{
    await updateFromTam(courses);
    await sleep(30000);
    return loop(courses);
};

loop();