/// <summary>
/// Calculates all of the discount lines for the transactions.
/// </summary>
/// <param name="pricingDataManager">Provides data access to the calculation.</param>
/// <param name="transaction">The sales transaction.</param>
/// <param name="shouldTotalLines">True if discount lines should be totaled for each line. False if they should be left as raw discount lines.</param>
/// <param name="priceContext">Price context.</param>
/// <remarks>Each sales line will have a collection of DiscountLines and a net discount total in DiscountAmount property (if totaling is enabled).</remarks>
public static void CalculateDiscountsForLines(
IPricingDataAccessor pricingDataManager,
SalesTransaction transaction,
bool shouldTotalLines,
PriceContext priceContext)
{
if (transaction == null)
{
throw new ArgumentNullException("transaction");
}
List <SalesLine> existingSalesLines = new List <SalesLine>();
List <SalesLine> newSalesLines = new List <SalesLine>();
if (priceContext.CalculateForNewSalesLinesOnly)
{
foreach (SalesLine salesLine in transaction.SalesLines)
{
if (priceContext.NewSalesLineIdSet.Contains(salesLine.LineId))
{
newSalesLines.Add(salesLine);
}
else
{
existingSalesLines.Add(salesLine);
}
}
// Calculate for new sales lines only.
transaction.SalesLines.Clear();
transaction.SalesLines.AddRange(newSalesLines);
}
Discount discountEngine = InitializeDiscountEngine(pricingDataManager);
discountEngine.CalculateDiscount(pricingDataManager, transaction, priceContext);
if (priceContext.CalculateForNewSalesLinesOnly)
{
// Add existing sales lines back after calculating for new sales lines only.
List <SalesLine> newSalesLinesFromCalculation = new List <SalesLine>();
foreach (SalesLine salesLine in transaction.SalesLines)
{
if (!priceContext.NewSalesLineIdSet.Contains(salesLine.LineId))
{
newSalesLinesFromCalculation.Add(salesLine);
}
}
transaction.SalesLines.Clear();
transaction.SalesLines.AddRange(existingSalesLines);
transaction.SalesLines.AddRange(newSalesLines);
transaction.SalesLines.AddRange(newSalesLinesFromCalculation);
}
if (shouldTotalLines)
{
// Consider calculable lines only. Ignore voided or return-by-receipt lines.
foreach (var salesLine in transaction.PriceCalculableSalesLines)
{
SalesLineTotaller.CalculateLine(transaction, salesLine, d => priceContext.CurrencyAndRoundingHelper.Round(d)); // technically rounding rule should be "sales rounding" rule
}
}
}