ANTOOZA-BACKEND/Application/Features/Admin/Store/Order/RejectRefund/Handler.cs

using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Domain.Entities.Store.ValueObject;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;

namespace Application.Features.Admin.Store.Order.RejectRefund;

public sealed class Handler(IAppDbContext db) : ICommandHandler<Command, Result>
{
    public async Task<Result> Handle(Command request, CancellationToken ct)
    {
        var refund = await db.OrderRefund.FirstOrDefaultAsync(r => r.ID == request.RefundID, ct);

        if (refund is null)
        {
            return Result.Failure(Error.NotFound("Refund.NotFound", "환불 요청을 찾을 수 없습니다."));
        }

        if (refund.Status != RefundStatus.Requested)
        {
            return Result.Failure(Error.Problem("Refund.NotPending", "처리 대기 중인 환불 요청만 거부 가능합니다."));
        }

        if (string.IsNullOrWhiteSpace(request.AdminMemo))
        {
            return Result.Failure(Error.Problem("Refund.MemoRequired", "거부 시 사유(AdminMemo)는 필수입니다."));
        }

        refund.Reject(request.AdminUserId, request.AdminEmail, request.AdminMemo);
        await db.SaveChangesAsync(ct);

        return Result.Success();
    }
}