public void Calculate_SingleOrderItem_ShouldAddCorrectCharge()
{
// Arrange
var orderItem = _orderItemBuilder.Build();
var order = _orderBuilder.WithOrderItems(new List <OrderItem> {
orderItem
}).Build();
var expectedChargeName = ChargeName.FromBaseChargeName(_chargeName, ChargeNames.Item);
var sut = new FixedChargeCalculator(_chargeName, new Price(CurrencyFakes.EUR, 10));
// Act
sut.Calculate(order);
// Assert
orderItem.Charges.Should()
.HaveCount(3).And
.ContainSingle(c => c.ChargeName.Value == expectedChargeName && c.ChargeAmount.Value == 10);
}
/// <summary>
/// Creates the specified range.
/// </summary>
/// <param name="range">The range.</param>
/// <param name="includeFixedCalculators">if set to <c>true</c> [include fixed calculators]. Should not be included when forward calculator is running
/// as part of the reverse calculator as the fixed charge will have already been added by the reverse calculator.</param>
/// <returns></returns>
/// <exception cref="InvalidChargeConfigurationException">Unknown charge configuration - can't create calculator delegate.</exception>
public static Calculator?Create(CalculationRange range, bool includeFixedCalculators = true)
{
Calculator?calculatorDelegate = null;
// Loop through each charge configuration (which are in order of execution) - and add the required
// calculator to the delegate.
foreach (var config in range.ChargeConfigurations)
{
IChargeCalculator?calculator = default;
switch (config)
{
// FIXED RATE CONFIGURATIONS
case FixedRateChargeConfiguration fixedChargeConfig when config is FixedRateChargeConfiguration:
{
if (includeFixedCalculators)
{
calculator = new FixedChargeCalculator(fixedChargeConfig.ChargeName, fixedChargeConfig.FixedChargeAmount);
}
break;
}
// WEIGHT BASED CONFIGURATIONS
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && weightBasedChargeConfig.Rate != null:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => weightBasedChargeConfig.Rate);
break;
}
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && config.ChargeName.Value is ChargeNames.Duty:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => oi.DutyRate);
break;
}
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && config.ChargeName.Value is ChargeNames.Vat:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => oi.VatRate);
break;
}
// RATE BASED CONFIGURATIONS
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.Rate != null:
{
calculator = new RateBasedChargeCalculator(rateBasedChargeConfig.ChargeName, (oi) => rateBasedChargeConfig.Rate, rateBasedChargeConfig.BaseCharges);
break;
}
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.ChargeName.Value is ChargeNames.Duty:
{
calculator = new RateBasedChargeCalculator(rateBasedChargeConfig.ChargeName, (oi) => oi.DutyRate, rateBasedChargeConfig.BaseCharges);
break;
}
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.ChargeName.Value is ChargeNames.Vat:
{
calculator = new RateBasedChargeCalculator(rateBasedChargeConfig.ChargeName, (oi) => oi.VatRate, rateBasedChargeConfig.BaseCharges);
break;
}
default:
throw new InvalidChargeConfigurationException("Unknown charge configuration - can't create calculator delegate.");
}
if (calculator != null)
{
// Add constraints
if (config.MinimumPayable != null)
{
calculator = new MinimumPayableConstraint(calculator, config.ChargeName, config.MinimumPayable);
}
if (config.MinimumCollectible != null)
{
calculator = new MinimumCollectibleConstraint(calculator, config.ChargeName, config.MinimumCollectible);
}
// Add created calculator to delegate
calculatorDelegate += calculator.Calculate;
}
}
return(calculatorDelegate);
}
public static Calculator?Create(CalculationRange range, IEnumerable <ChargeName> deminimisBaseCharges)
{
Calculator?calculatorDelegate = null;
foreach (var config in range.ChargeConfigurations)
{
IChargeCalculator calculator;
switch (config)
{
// FIXED RATE CONFIGURATIONS
case FixedRateChargeConfiguration fixedChargeConfig when config is FixedRateChargeConfiguration:
{
calculator = new FixedChargeCalculator(fixedChargeConfig.ChargeName, fixedChargeConfig.FixedChargeAmount);
break;
}
// WEIGHT BASED CONFIGURATIONS
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && weightBasedChargeConfig.Rate != null:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => weightBasedChargeConfig.Rate);
break;
}
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && config.ChargeName.Value is ChargeNames.Duty:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => oi.DutyRate);
break;
}
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && config.ChargeName.Value is ChargeNames.Vat:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => oi.VatRate);
break;
}
// RATE BASED CONFIGURATIONS
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.Rate != null:
{
calculator = new ReverseRateCalculator(rateBasedChargeConfig.ChargeName, (oi) => rateBasedChargeConfig.Rate, rateBasedChargeConfig.BaseCharges);
break;
}
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.ChargeName.Value is ChargeNames.Duty:
{
calculator = new ReverseRateCalculator(rateBasedChargeConfig.ChargeName, (oi) => oi.DutyRate, rateBasedChargeConfig.BaseCharges);
break;
}
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.ChargeName.Value is ChargeNames.Vat:
{
calculator = new ReverseRateCalculator(rateBasedChargeConfig.ChargeName, (oi) => oi.VatRate, rateBasedChargeConfig.BaseCharges);
break;
}
default:
throw new InvalidChargeConfigurationException("Unknown charge configuration - can't create calculator delegate.");
}
// Add created calculator to delegate
calculatorDelegate += calculator.Calculate;
}
foreach (var deminimisBaseCharge in deminimisBaseCharges)
{
// Add the item price calculator last
calculatorDelegate += new ReversePriceCalculator(deminimisBaseCharge, $"Input{deminimisBaseCharge}").Calculate;
}
return(calculatorDelegate);
}
