src/Services/Ordering/Ordering.Domain/AggregatesModel/OrderAggregate/OrderItem.cs

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namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.OrderAggregate;

public class OrderItem
    : Entity
{
    // DDD Patterns comment
    // Using private fields, allowed since EF Core 1.1, is a much better encapsulation
    // aligned with DDD Aggregates and Domain Entities (Instead of properties and property collections)
    private string _productName;
    private string _pictureUrl;
    private decimal _unitPrice;
    private decimal _discount;
    private int _units;

    public int ProductId { get; private set; }

    protected OrderItem() { }

    public OrderItem(int productId, string productName, decimal unitPrice, decimal discount, string PictureUrl, int units = 1)
    {
        if (units <= 0)
        {
            throw new OrderingDomainException("Invalid number of units");
        }

        if ((unitPrice * units) < discount)
        {
            throw new OrderingDomainException("The total of order item is lower than applied discount");
        }

        ProductId = productId;

        _productName = productName;
        _unitPrice = unitPrice;
        _discount = discount;
        _units = units;
        _pictureUrl = PictureUrl;
    }

    public string GetPictureUri() => _pictureUrl;

    public decimal GetCurrentDiscount()
    {
        return _discount;
    }

    public int GetUnits()
    {
        return _units;
    }

    public decimal GetUnitPrice()
    {
        return _unitPrice;
    }

    public string GetOrderItemProductName() => _productName;

    public void SetNewDiscount(decimal discount)
    {