public async Task ReserverAsync(IdVoyage idVoyage, IReadOnlyCollection <Passager> passagers)
{
var train = await _trainRepository.GetTrainDuVoyageAsync(idVoyage);
if (train == null)
{
throw new VoyageSansTrainException(idVoyage);
}
if (!train.PeutReserver(passagers.Count, SeuilCapacite))
{
throw new TrainPleinException();
}
var reservation = train.Reserver(passagers, SeuilCapacite);
await _reservationRepository.SaveAsync(reservation);
await _notifieur.NotifierReservationValideeAsync(reservation);
}
