using System.ComponentModel.DataAnnotations;
namespace Store.Users.Contracts.Dtos;

/// <summary>资金请求；DTO 检查输入，服务区分积分/余额操作并校验权限。</summary>
public sealed class UserFundsRequest : IValidatableObject
{
    [Required(ErrorMessage = "目标账户不能为空"), StringLength(20)] public string UserName { get; set; } = "";
    [Required(ErrorMessage = "请求号不能为空"), StringLength(64)] public string RequestId { get; set; } = "";
    [Range(typeof(decimal), "0.01", "1000000")]
    public decimal Amount { get; set; }
    /// <summary>积分支持充值、转移；余额支持充值、消费。</summary>
    [Required(ErrorMessage = "操作类型不能为空"), StringLength(20)] public string Operation { get; set; } = "";
    [StringLength(255)]
    public string? Remark { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (decimal.Round(Amount, 2) != Amount)
            yield return new ValidationResult("金额最多保留两位小数", [nameof(Amount)]);
    }
}

public sealed record UserFundsResponse(string UserName, decimal Value, string RequestId);