ANTOOZA-BACKEND/Domain/Entities/Store/GameProductCatalog.cs

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Domain.Entities.Store;

/// <summary>
/// 게임별 인앱 상품 SKU 정가 카탈로그. 파트너 결제 보고(ApiPurchase) 금액 검증용 —
/// 보고가가 정가와 다르면 ApiPurchase.PriceMismatched flag (등록은 통과, Admin 검토).
/// 카탈로그 미등록 SKU 는 검증 없이 통과.
/// </summary>
public class GameProductCatalog
{
    [ForeignKey(nameof(GameID))]
    public virtual Game? Game { get; private set; }

    [Key]
    public int ID { get; private set; }

    public int GameID { get; private set; }

    /// <summary>인앱 상품 SKU (예: "diamond_100"). (GameID, ProductID) UNIQUE.</summary>
    public string ProductID { get; private set; } = default!;

    /// <summary>정가 (KRW)</summary>
    public int Price { get; private set; }

    public bool IsActive { get; private set; } = true;

    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;

    public DateTime? UpdatedAt { get; private set; }

    private GameProductCatalog() { }

    public static GameProductCatalog Create(int gameID, string productID, int price)
    {
        if (gameID <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(gameID));
        }

        ValidateProductID(productID);
        ValidatePrice(price);

        return new GameProductCatalog
        {
            GameID = gameID,
            ProductID = productID.Trim(),
            Price = price
        };
    }

    public void Update(int price, bool isActive)
    {
        ValidatePrice(price);

        Price = price;
        IsActive = isActive;
        UpdatedAt = DateTime.UtcNow;
    }

    private static void ValidateProductID(string productID)
    {
        if (string.IsNullOrWhiteSpace(productID))
        {
            throw new ArgumentException("ProductID is required.", nameof(productID));
        }

        if (productID.Length > 100)
        {
            throw new ArgumentOutOfRangeException(nameof(productID), "ProductID 는 100자 이하로 입력하세요.");
        }
    }

    private static void ValidatePrice(int price)
    {
        if (price <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(price), "Price must be positive.");
        }
    }
}