// TODO: Create abstraction
private void DetectGreyZones(CalculatorConfiguration configuration, Order order)
{
var boundaries = new List <Tuple <Price, CalculationRange> >();
foreach (var range in configuration.CalculationRanges.Where(x => x.DeminimisThreshold.Value != 0))
{
boundaries.Add(new Tuple <Price, CalculationRange>(new Price(order.Currency, range.DeminimisThreshold.Value - .01m), range));
boundaries.Add(new Tuple <Price, CalculationRange>(new Price(order.Currency, range.DeminimisThreshold.Value), range));
}
var greyZonePrices = new List <Tuple <Price, CalculationRange> >();
foreach (var boundary in boundaries)
{
// Create forward calc
var range = configuration.GetRangeForBasePrice(boundary.Item1);
var forwardCalculator = ForwardCalculatorFactory.Create(range);
var orderItems = order.OrderItems.Select(oi => new OrderItem(oi.Quantity, oi.Weight, oi.VatRate, oi.DutyRate, new Price(order.Currency, order.RelativeOrderItemValue(oi) * boundary.Item1.Value))).ToList();
orderItems.ForEach(oi => { var c = oi.GetChargeAmount(ChargeNames.InputItem, order.Currency); oi.AddCharge(new OrderCharge(ChargeNames.Item, c, ChargeNames.Item)); });
var detectionOrder = new Order(order.Country, order.Currency, orderItems, new Price(order.Currency, 0));
forwardCalculator?.Invoke(detectionOrder);
var greyZonePrice = detectionOrder.Charges
.Where(x => !x.InputCharge)
.Where(x => x.ChargeName.Value.EndsWith(ChargeNames.Item))
.Select(x => x.ChargeAmount.Value)
.Sum();
greyZonePrices.Add(new Tuple <Price, CalculationRange>(new Price(order.Currency, greyZonePrice), boundary.Item2));
}
if (greyZonePrices.Count % 2 != 0)
{
throw new ArgumentException("Invalid grey zones, should be in pairs!");
}
for (int x = 0; x < greyZonePrices.Count; x++)
{
configuration.AddGreyZone(new GreyZone(greyZonePrices[x].Item1, greyZonePrices[x + 1].Item1, greyZonePrices[x].Item2));
x++;
}
}
public void GetCalculationRange_MultipleRanges_ShouldReturnCorrectRegions(string price, string expectedThreshold)
{
// Arrange
var deminimisBaseCharges = new List <ChargeName> {
"Item"
};
var chargeConfigurations = new List <ChargeConfiguration>
{
new FixedRateChargeConfiguration("Duty", "EUR0", "EUR10"),
new FixedRateChargeConfiguration("Duty", "EUR100", "EUR20"),
new FixedRateChargeConfiguration("Duty", "EUR200", "EUR30")
};
var calculationRanges = new CalculatorConfiguration(chargeConfigurations, deminimisBaseCharges);
// Act
var range = calculationRanges.GetRangeForBasePrice(new Price(price));
// Assert
range.DeminimisThreshold.Should().Be(new Price(expectedThreshold));
}