public UsageCost(Tariff tariff, decimal?gasPrice, decimal?powerPrice, TaxedValue total)
{
GasPrice = gasPrice;
PowerPrice = powerPrice;
Tariff = tariff;
Total = total;
}
private static UsageCost CostForTariff(Tariff tariff, Kwh <Power>?powerUsage, Kwh <Gas>?gasUsage)
{
var g = tariff.GasRate * gasUsage + tariff.StandingCharge * 12;
var p = tariff.PowerRate * powerUsage + tariff.StandingCharge * 12;
var total = TaxedValue.FromPreTaxValue((g ?? 0) + (p ?? 0), TaxHelper.ApplyTax);
return(new UsageCost(tariff, g, p, total));
}
private static Kwh <TFuel>?AnnualFuelUsage <TFuel>(decimal?rate, decimal standingCharge, TaxedValue monthlyBudget) =>
!rate.HasValue
? new Kwh <TFuel>?()
: new Kwh <TFuel>((monthlyBudget.PreTax - standingCharge) * 12 * rate.Value);
public static Kwh <Power>?AnnualPowerUsage(Tariff tariff, TaxedValue monthlyBudget) => AnnualFuelUsage <Power>(tariff.PowerRate, tariff.StandingCharge, monthlyBudget);
public static Kwh <Gas>?AnnualGasUsage(Tariff tariff, TaxedValue monthlyBudget) => AnnualFuelUsage <Gas>(tariff.GasRate, tariff.StandingCharge, monthlyBudget);
