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

namespace Domain.Entities.Developers;

/// <summary>
/// API 결제 취소 감사 기록. ApiPurchase 1:1 (PurchaseID UNIQUE — 중복 취소 방지).
/// WasConfirmed=false → 보류 중 취소 (지갑 무관, Recovered/Shortfall 0).
/// WasConfirmed=true → 확정 후 취소 (StoreRevenue 회수, 잔액 부족분은 ShortfallAmount 에 기록).
/// </summary>
public class ApiPurchaseCancel
{
    [ForeignKey(nameof(PurchaseID))]
    public virtual ApiPurchase? Purchase { get; private set; }

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

    public int PurchaseID { get; private set; }

    public int ApplicationID { get; private set; }

    public int ChannelID { get; private set; }

    public int CreditedMemberID { get; private set; }

    /// <summary>확정(지갑 적립) 후의 취소였는지</summary>
    public bool WasConfirmed { get; private set; }

    /// <summary>실제 회수액 (KRW). 보류 중 취소면 0.</summary>
    public int RecoveredAmount { get; private set; }

    /// <summary>잔액 부족으로 회수하지 못한 금액 (KRW). 0 이면 완전 회수.</summary>
    public int ShortfallAmount { get; private set; }

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

    private ApiPurchaseCancel() { }

    public static ApiPurchaseCancel Create(ApiPurchase purchase, bool wasConfirmed, int recoveredAmount, int shortfallAmount)
    {
        if (purchase.ID <= 0)
        {
            throw new ArgumentException("Purchase must be persisted.", nameof(purchase));
        }

        if (recoveredAmount < 0)
        {
            throw new ArgumentOutOfRangeException(nameof(recoveredAmount));
        }

        if (shortfallAmount < 0)
        {
            throw new ArgumentOutOfRangeException(nameof(shortfallAmount));
        }

        return new ApiPurchaseCancel
        {
            PurchaseID = purchase.ID,
            ApplicationID = purchase.ApplicationID,
            ChannelID = purchase.ChannelID,
            CreditedMemberID = purchase.CreditedMemberID,
            WasConfirmed = wasConfirmed,
            RecoveredAmount = recoveredAmount,
            ShortfallAmount = shortfallAmount
        };
    }
}