public List <InvalidVoucher> Validate(
List <Product> products, List <OfferVoucher> vouchers)
{
var groupedProducts = products.GroupBy(product => product.Category)
.Select(grouping => new
{
category = grouping.Key,
totalValue = grouping.Sum(g => g.Value)
}).ToList();
var invalidVouchers = new List <InvalidVoucher>();
var validVouchers = new List <OfferVoucher>();
foreach (var offerVoucher in vouchers)
{
if (offerVoucher.CategoryRestriction != null)
{
var productsInCaegory = groupedProducts.SingleOrDefault(
p => p.category == offerVoucher.CategoryRestriction);
if (productsInCaegory == null)
{
invalidVouchers.Add(new InvalidVoucher(offerVoucher,
"There are no products in your basket applicable to this voucher."));
continue;
}
}
validVouchers.Add(offerVoucher);
}
invalidVouchers.AddRange(_offerThresholdValidator.Validate(products, validVouchers));
return(invalidVouchers);
}
public List <InvalidVoucher> Validate(List <Product> products, List <OfferVoucher> vouchers)
{
var productsWithoutGiftVouchers = products
.Where(p => p.Category != ProductCategory.GiftVoucher).ToList();
var basketTotal = productsWithoutGiftVouchers.Sum(v => v.Value);
var invalidVouchers = new List <InvalidVoucher>();
var validVouchers = new List <OfferVoucher>();
foreach (var offerVoucher in vouchers)
{
if (offerVoucher.Threshold > basketTotal)
{
invalidVouchers.Add(new InvalidVoucher(offerVoucher,
"You have not reached the spend threshold. " +
$"Spend another {((offerVoucher.Threshold - basketTotal) + 0.01m).ToString("C")} " +
$"to receive {offerVoucher.Value.ToString("C")} discount."));
continue;
}
validVouchers.Add(offerVoucher);
}
invalidVouchers.AddRange(_singleOfferVoucherValidator.Validate(products, validVouchers));
return(invalidVouchers);
}
public List <InvalidVoucher> Validate(List <Product> products, List <Voucher> vouchers)
{
var offerVouchers = vouchers.OfType <OfferVoucher>().ToList();
return(_offerVoucherValidator.Validate(products, offerVouchers));
}