/// <summary>
/// Add a <see cref="Discount" /> which is mapped to a specific <see cref="Item" />.
/// </summary>
/// <param name="item">The <see cref="Item" />.</param>
/// <param name="discount">The mapped <see cref="Discount" />.</param>
public void Add(Item item, Discount discount)
{
Checks.CheckArgumentNotNull(item, "Item can't be null.");
Checks.CheckArgumentNotNull(discount, "Discount can't be null.");
discountItems[item] = discount;
}
public CheckoutItem(Item item, Discount discount)
{
Checks.CheckArgumentNotNull(item, "Item is null.");
Checks.CheckArgumentNotNull(discount, "Discount is null.");
Item = item;
Discount = discount;
}
/// <summary>
/// Add items to checkout.
/// </summary>
/// <param name="amount">The item amount.</param>
/// <param name="item">The item for checkout.</param>
public void AddItem(int amount, Item item)
{
Checks.CheckArgumentNotNull(item, "Item can't be null.");
Checks.CheckArgument(amount > 0, "Amount must be > 0.");
if (items.TryGetValue(item, out var currentAmount))
{
items[item] = currentAmount + amount;
}
else
{
items.Add(item, amount);
}
}