// Calculates the rental price for a reservation when car has been returned
/// <summary>
/// The formula for calculating the rental cost is:
/// baseDayRentalPrice * numberOfDays * baseDayRentalModifier + kmPrice * numberOfKm * kmPriceModifier
/// Preconditions: The given ActivatedReservation must be deactivated before calling this method.
/// Calculates the rental price for a reservation.
/// </summary>
/// <param name="activatedReservationId"></param>
/// <returns>The total cost of the rental</returns>
public async Task <double> calculateCost(int activatedReservationId)
{
await checkRentalRates();
service = new DatabaseAccessService(context);
var activatedReservation = await service.getActivatedReservation(activatedReservationId);
if (activatedReservation == null)
{
throw new ArgumentException("No ActivatedReservation with given id exists");
}
var rentedCar = await service.getRentalCar(activatedReservation.rentedCar.carNumber);
var carType = rentedCar.rentalCarType;
var dayDiff = (activatedReservation.reservation.expectedReturnDate
- activatedReservation.reservation.rentalDate).Days;
var mileage = activatedReservation.endMileage - activatedReservation.startMileage;
double price = baseDayRental * dayDiff * carType.basePriceModifier
+ kmPrice * mileage * carType.kmPriceModifier;
return(price);
}
/// <summary>
/// Precondition: The given ActivatedReservation must be currently active.
/// Deactivates the given ActivatedReservation. This means the rented car has been
/// returned.
/// </summary>
/// <param name="activatedReservationId"></param>
/// <returns>Returns the deactivated ActivatedReservation.</returns>
public async Task <ActivatedReservation> deactivateActivatedReservation(int activatedReservationId)
{
var activatedReservation = await db.getActivatedReservation(activatedReservationId);
if (!activatedReservation.isCurrentlyActive)
{
throw new InvalidOperationException("Cannot deactivate an already deactivated ActivatedReservation");
}
activatedReservation.endMileage = activatedReservation.rentedCar.currentMileage;
activatedReservation.isCurrentlyActive = false;
activatedReservation.actualReturnDate = DateTime.Now;
await context.SaveChangesAsync();
return(activatedReservation);
}
