private void EnqueueIfRemained(Lesson lesson, bool isUsed = true)
{
if (!isUsed)
{
this.CurrentDailyHours -= lesson.Hour;
lesson.SetHour(0);
}
lesson.SumUsed(lesson.Hour);
if (lesson.Used == lesson.TotalHour)
{
return;
}
lesson.SetHour(lesson.TotalHour - lesson.Used);
Lessons.Enqueue(lesson);
}