/// <summary>
/// Methood to apply discount
/// </summary>
/// <param name="items">Product basket for which discount is applied</param>
/// <returns><see cref="DiscountOutput"/></returns>
public override IEnumerable <DiscountOutput> ApplyDiscount(IEnumerable <ProductInCart> items)
{
List <DiscountOutput> discountOutputs = new List <DiscountOutput>();
var discountApplicable = items.FirstOrDefault(x => x.Product.Name == _productQualifiesForDiscount && x.Quantity >= _quantityX);
if (discountApplicable != null)
{
foreach (var item in items)
{
if (item.Product.Name == ProductName)
{
var discountFactor = Math.Min((discountApplicable.Quantity / _quantityX), item.Quantity);
var amount = Math.Round((item.Product.UnitPrice * discountFactor) * _percentage, 2);
var dicountOutput = new DiscountOutput()
{
DisplayText = $"Buy {_quantityX} {_productQualifiesForDiscount} Get {item.Product.Name} {_percentage:P0} OFF:",
DiscountAmount = amount
};
discountOutputs.Add(dicountOutput);
}
}
}
return(discountOutputs);
}
/// <summary>
/// Methood to apply discount
/// </summary>
/// <param name="items">Product basket for which discount is applied</param>
/// <returns><see cref="DiscountOutput"/></returns>
public override IEnumerable <DiscountOutput> ApplyDiscount(IEnumerable <ProductInCart> items)
{
List <DiscountOutput> discountOutputs = new List <DiscountOutput>();
foreach (var item in items)
{
if (item.Product.Name == ProductName)
{
var amount = Math.Round((item.Product.UnitPrice * item.Quantity) * _percentage, 2);
var dicountOutput = new DiscountOutput()
{
DisplayText = $"{item.Product.Name} {_percentage:P0} OFF:",
DiscountAmount = amount
};
discountOutputs.Add(dicountOutput);
}
}
return(discountOutputs);
}