public ParcelOrderOutput BuildOrder(ParcelOrder parcelOrder)
{
if (!parcelOrder.ParcelOrderItems.HaveValidParcelItems())
{
throw new Exception("Invalid Process.");
}
var parcelOrderOutput = new ParcelOrderOutput
{
IsSpeedy = parcelOrder.Speedy
};
var parcelBySize = parcelOrder.ParcelOrderItems.Where(p => p.CalculationType.Equals(CalculationType.BySize));
var parcelByWeight = parcelOrder.ParcelOrderItems.Where(p => p.CalculationType.Equals(CalculationType.ByWeight));
if (parcelBySize.Any())
{
var(lineItems, totalCost) = ComposeLineItems(parcelBySize, ParcelBySizeSelector());
parcelOrderOutput.LineItems.AddRange(lineItems);
parcelOrderOutput.TotalCost += totalCost;
}
if (parcelByWeight.Any())
{
var(lineItems, totalCost) = ComposeLineItems(parcelByWeight, ParcelByWeightSelector());
parcelOrderOutput.LineItems.AddRange(lineItems);
parcelOrderOutput.TotalCost += totalCost;
}
// apply discounts
if (parcelOrder.DiscountToApply.Any())
{
AppliedDiscount discount;
if (parcelOrder.DiscountToApply.Contains(DiscountTypes.Mixed))
{
discount = _discountCalculator.CalculateMixedDiscount(parcelOrderOutput.LineItems);
}
else
{
discount = _discountCalculator.CalculateDiscount(parcelOrderOutput.LineItems);
}
parcelOrderOutput.TotalCost = discount.TotalCost;
parcelOrderOutput.TotalSaved = discount.SavedCost;
}
if (parcelOrder.Speedy)
{
parcelOrderOutput.TotalCost *= 2;
}
return(parcelOrderOutput);
}