Order klasa

K1SR

Jun 18th, 2025

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public class Order // Ovo je AGGREGATE ROOT
{
public Guid Id { get; private set; } // Identitet agregatnog korena
public DateTime CreatedOn { get; private set; }
public Address ShippingAddress { get; private set; } // Value Object
public OrderStatus Status { get; private set; } // Stanje porudžbine
// Kolekcija OrderItem-a (interni entiteti ili value objekti)
// Pristup ovoj kolekciji je samo preko metoda Order agregata
private List<OrderItem> _orderItems;
public IReadOnlyCollection<OrderItem> OrderItems => _orderItems.AsReadOnly();
public Money TotalPrice { get; private set; } // Izračunata vrednost, Value Object
public Order(Guid id, DateTime createdOn, Address shippingAddress)
{
Id = id;
CreatedOn = createdOn;
ShippingAddress = shippingAddress ?? throw new ArgumentNullException(nameof(shippingAddress));
Status = OrderStatus.Created;
_orderItems = new List<OrderItem>();
TotalPrice = new Money(0, "EUR"); // Inicijalna vrednost
}
// Sva interakcija sa agregatom ide kroz koren (Order klasu)
public void AddItem(Product product, int quantity)
{
// Poslovno pravilo: ne dozvoliti negativnu količinu
if (quantity <= 0)
{
throw new ArgumentException("Quantity must be positive.");
}
// Provera da li proizvod već postoji u porudžbini
var existingItem = _orderItems.FirstOrDefault(item => item.ProductId == product.Id);
if (existingItem != null)
{
// Ažuriranje postojeće stavke
existingItem.IncreaseQuantity(quantity); // Ova metoda bi bila definisana unutar OrderItem
}
else
{
// Dodavanje nove stavke
_orderItems.Add(new OrderItem(Guid.NewGuid(), product.Id, product.Name, product.Price, quantity));
}
// Izračunavanje ukupne cene (poslovno pravilo, konzistentnost agregata)
CalculateTotalPrice();
}
public void RemoveItem(Guid orderItemId)
{
var itemToRemove = _orderItems.FirstOrDefault(item => item.Id == orderItemId);
if (itemToRemove == null)
{
throw new InvalidOperationException("Order item not found.");
}
_orderItems.Remove(itemToRemove);
CalculateTotalPrice();
}
public void UpdateShippingAddress(Address newAddress)
{
// Validacija za promenu adrese ako je potrebno (npr. samo pre isporuke)
if (Status != OrderStatus.Created)
{
throw new InvalidOperationException("Shipping address can only be updated for new orders.");
}
ShippingAddress = newAddress;
}
private void CalculateTotalPrice()
{
decimal totalAmount = 0;
string currency = "EUR"; // Pretpostavka jedne valute za TotalPrice
foreach (var item in _orderItems)
{
totalAmount += item.ProductPrice.Amount * item.Quantity;
// Provera valute ako su stavke u različitim valutama
if (currency != item.ProductPrice.Currency)
{
// Možda kompleksnija logika za konverziju ili bacanje izuzetka
throw new InvalidOperationException("Mixed currencies in order items.");
}
}
TotalPrice = new Money(totalAmount, currency);
}
// Mogući unutrašnji entitet (OrderItem)
public class OrderItem // Ovo je entitet unutar agregata, nema sopstveni repozitorijum
{
public Guid Id { get; private set; } // Identitet unutar agregata
public Guid ProductId { get; private set; }
public string ProductName { get; private set; }
public Money ProductPrice { get; private set; } // Value Object
public int Quantity { get; private set; }
public OrderItem(Guid id, Guid productId, string productName, Money productPrice, int quantity)
{
Id = id;
ProductId = productId;
ProductName = productName;
ProductPrice = productPrice;
Quantity = quantity;
}
public void IncreaseQuantity(int amount)
{
if (amount <= 0)
{
throw new ArgumentException("Amount must be positive.");
}
Quantity += amount;
}
}
}
public enum OrderStatus
{
Created,
Paid,
Shipped,
Delivered,
Cancelled
}

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