/// <summary>
/// Calculates total price for the booking when the car is returned, an returns the updated
/// booking with the updated total price as well as updated "enddate" according to which date
/// the car was actually returned.
/// </summary>
/// <param name="bookingNumber">Booking id connected to the reservation that is now ending (car is returned).</param>
/// <param name="returnDate">Date of the actual return of the car.</param>
/// <param name="currentCarMilage">The current car milage when the car is returned.</param>
/// <returns>The booking object with upddated totalprice for the rental after the car is returned.</returns>
public Booking ReturnRentedCar(int bookingNumber, DateTime returnDate, int currentCarMilage)
{
var theBooking = repos.DataSet <Booking>().Include(c => c.Car).SingleOrDefault(b => b.Id == bookingNumber);
if (theBooking == null)
{
throw new DBItemNotFoundException("There is no booking with the given bookingnumber, please check entered number.");
}
if (returnDate < theBooking.RentalDate)
{
throw new DateOutOfRangeException("ReturnDate for the car can not be before startdate of the booking/reservation.");
}
if (theBooking.TotalCostOfRent != null)
{
throw new CarAlreadyReturnedException("Car has already been registered as returned in the system.");
}
if (currentCarMilage < theBooking.Car.TotalCarMilage)
{
throw new ArgumentException("Can not set total car milage to a lower value than it was in the start of the rental period.");
}
var numberOfDrivenKilometers = currentCarMilage - theBooking.Car.TotalCarMilage;
theBooking.DateOfRentalEnd = returnDate;
theBooking.KmDrivenWithinReservation = numberOfDrivenKilometers;
var totalRentalPrice = CalculatePriceOfCarRental(theBooking);
theBooking.TotalCostOfRent = totalRentalPrice;
repos.SaveChanges();
return(theBooking);
}