public decimal CalculateBasketTotal()
{
var basketTotal = 0m;
var grouper = new BookGrouper();
var distinctProductGroups = grouper.SortBooksIntoDistinctGroups(this.basket.Books);
var productDiscounter = new PriceDiscountCalculator();
foreach (var distinctProductGroup in distinctProductGroups)
{
var totalGroupPrice = GetGroupPrice(distinctProductGroup.Count, this.fullProductPrice);
basketTotal += productDiscounter.TotalDiscountAppliedToDistinctBookCollection(
distinctProductGroup.Count,
totalGroupPrice);
}
return(basketTotal);
}
private decimal GetDicountedPrice(int numberOfBooks, decimal bookCollectionPrice)
{
var discountCalculator = new PriceDiscountCalculator();
return(discountCalculator.TotalDiscountAppliedToDistinctBookCollection(numberOfBooks, bookCollectionPrice));
}