public virtual async Task <DeliveryChargeEntity> CalculateAsync(int addressId, int deliveryScheduleId, float subtotal, bool hasPromotion = false)
{
var addrE = await AddressRepository.FindAsync(addressId) ?? throw new EntityNotFoundException();
var dScheduleE = await DeliveryScheduleRepository.FindAsync(deliveryScheduleId) ?? throw new EntityNotFoundException();
var riderEs = await RiderRepository.GetRidersForTheCity(addrE.CityID);
var meanDistance = GetMeanDistance(addrE, riderEs);
var distanceChargeE = await AsyncExecutor.LastOrDefaultAsync(DistanceChargeRepository
.Where(e => e.From < meanDistance)
.OrderBy(e => e.From));
var subtotalPercentageE = await AsyncExecutor.LastOrDefaultAsync(SubtotalPercentageRepository.Where(e => e.From < subtotal)
.OrderBy(e => e.From));
var charge = subtotal * subtotalPercentageE.Percentage;
charge += (hasPromotion)? 0 : distanceChargeE.Charge;
charge += charge * dScheduleE.CostIncreasePercentage;
return(new DeliveryChargeEntity(charge, distanceChargeE.Id, subtotalPercentageE.Id, dScheduleE.Id));
}
