public void ReturnCar(Guid rentalId, Guid carId, Guid driverId, DateTime finished)
{
Car car = this._unitOfWork.CarRepository.Get(carId)
?? throw new Exception($"Could not find the car: '{carId}'");
Driver driver = this._unitOfWork.DriverRepository.Get(driverId)
?? throw new Exception($"Could not find the driver: '{driverId}'");
Rental rental = this._unitOfWork.RentalRepository.Get(rentalId)
?? throw new Exception($"Could not find rental '{rentalId}'");
//change position of car
this._positionService.CarPosition(car);
//end rental (set finished time value, calculate cost and amount of free minutes)
rental.ReturnCar(finished);
//set car status to "free"
car.MakeCarFree();
//add calculated amount of free miutes to driver's account
driver.AddFreeMinutes(rental.FreeMinutes);
//change driver's balance
driver.ChangeBalance(false, rental.Total);
this._unitOfWork.Commit();
}