private decimal DiscountForSetSize(List <Book> books, int evaluationSetSize)
{
var discountAmount = 0m;
var splitterOptions = new SetSplitterOptions
{
MaximumSetSize = evaluationSetSize
};
var splitter = new SetSplitter(splitterOptions);
var setsOfBooks = splitter.Split(books);
foreach (var setOfBooks in setsOfBooks)
{
var quantityOfBooks = setOfBooks.Books.Count;
var basePriceOfSet = setOfBooks.Books.Sum(x => x.Price);
switch (quantityOfBooks)
{
case 1:
discountAmount += 0;
break;
case 2:
discountAmount += basePriceOfSet * 0.05m;
break;
case 3:
discountAmount += basePriceOfSet * 0.1m;
break;
case 4:
discountAmount += basePriceOfSet * 0.2m;
break;
case 5:
discountAmount += basePriceOfSet * 0.25m;
break;
default:
throw new Exception($"Not sure how to handle this amount of books in the set: {quantityOfBooks}");
}
}
return(discountAmount);
}
public SetSplitter(SetSplitterOptions splitterOptions)
{
options = splitterOptions;
}