public async Task AddCustomerToTripAsync(Guid tripId, Guid customerId)
{
var trip = await _tripRepository.GetTripAsync(tripId);
if (trip.TripStatus == TripStatus.Cancelled)
{
throw new DomainException(DomainErrorCodes.AddingCustomerToCancelledTrip, null,
"Cannot add customer to cancelled trip");
}
var customer = await _customerRepository.GetCustomerAsync(customerId);
CheckTripNullOrFail(trip);
if (customer == null)
{
throw new DomainException(DomainErrorCodes.CustomerDoesNotExist, null, "Customer does not exist!");
}
await _tripRepository.AddCustomerToTripAsync(trip, customer);
}