public CheckoutBasket CheckoutBasket()
{
var distinctBooks = _bookBasket.BooksInBasket.Select(x => x.Quantity).Where(x => x > 0).ToArray();
var checkoutBasket = new CheckoutBasket()
{
BooksPurchased = _bookBasket, UndiscountedBooks = distinctBooks, DiscountedPriceTotal = 0
};
var potentialCheckoutBaskets = GeneratePossibleCheckoutValues(new List <CheckoutBasket>()
{
checkoutBasket
});
var lowestPricedBasket = potentialCheckoutBaskets.OrderBy(x => x.DiscountedPriceTotal).First();
return(lowestPricedBasket);
}
private List <CheckoutBasket> IteratePossibleDiscounts(List <CheckoutBasket> updatedBaskets, CheckoutBasket basket, int[] booksToProcess)
{
for (int booksInDiscount = 2; booksInDiscount <= booksToProcess.Count(); booksInDiscount++)
{
var discount = _discounts.Where(x => x.NumberOfBooks == booksInDiscount).FirstOrDefault();
var discountsApplied = new List <Discount>(basket.DiscountsApplied);
discountsApplied.Add(discount);
var updatedBasket = new CheckoutBasket()
{
BooksPurchased = basket.BooksPurchased,
UndiscountedBooks = UpdateUndiscountedBooksRecord(booksToProcess, booksInDiscount),
DiscountedPriceTotal = basket.DiscountedPriceTotal + discount.TotalCost,
DiscountsApplied = discountsApplied
};
updatedBaskets.Add(updatedBasket);
}
return(updatedBaskets);
}