/// <summary>
/// Adding a product into order for customer can order multiple items
/// </summary>
/// <param name="product"> The customer product purchase </param>
/// <param name="amount"> The number of product to be purchased </param>
public bool AddProduct(Product product, int amount)
{
// SPECIAL CASE TO CONSIDER: IF THE RESTRICTED AMOUNT IS LESS THAN OR EQUAL TO 0, IT MEANS THERE IS NO LIMIT.
if (product == null || amount <= 0 || (product.RestrictedAmount > 0 && product.RestrictedAmount < amount))
{
return(false);
}
ProductDetail.Add(product.Name, amount);
ProductPrice.Add(product.Name, Math.Round(product.Price, 2));
return(true);
}