private MotFee GetApplicableMotFee(InvoiceCalculationValues invoiceCalculationValues)
{
return(invoiceCalculationValues.MotFees
.Where(mf => JobDate >= mf.ApplicableFrom)
.OrderByDescending(mf => mf.ApplicableFrom)
.FirstOrDefault());
}
private VatRate GetApplicableVatRate(InvoiceCalculationValues invoiceCalculationValues)
{
return(invoiceCalculationValues.VatRates
.Where(vr => JobDate >= vr.ApplicableFrom)
.OrderByDescending(vr => vr.ApplicableFrom)
.FirstOrDefault());
}
private LabourRate GetApplicableLabourRate(InvoiceCalculationValues invoiceCalculationValues)
{
return(invoiceCalculationValues.LabourRates
.Where(lr => JobDate >= lr.ApplicableFrom)
.OrderByDescending(lr => lr.ApplicableFrom)
.FirstOrDefault());
}
public InvoiceCosts CalculateInvoiceCosts(InvoiceCalculationValues invoiceCalculationValues)
{
var applicableVatRate = GetApplicableVatRate(invoiceCalculationValues);
var applicableLabourRate = GetApplicableLabourRate(invoiceCalculationValues);
var applicableMotFee = GetApplicableMotFee(invoiceCalculationValues);
applicableVatRate.ShouldNotBeNull($"No historic VAT rate available for {JobDate}");
applicableLabourRate.ShouldNotBeNull($"No historic Labour rate available for {JobDate}");
applicableMotFee.ShouldNotBeNull($"No historic MOT fee available for {JobDate}");
var partsCost = Parts.Sum(p => p.Cost);
var labourCost = LabourHours * applicableLabourRate.Rate;
var vatCost = (partsCost + labourCost) / 100 * applicableVatRate.Rate;
var motCost = IsMotTest ? applicableMotFee.Fee : 0;
var totalCost = partsCost + labourCost + vatCost + motCost;
return(new InvoiceCosts(labourCost, partsCost, vatCost, motCost, totalCost));
}