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

/// <summary>用户提交的充值备注。</summary>
public sealed class UserTopUpMessageRequest
{
    /// <summary>目标账户；省略时为本人，指定时检查管理权限。</summary>
    [StringLength(20)]
    public string? UserName { get; set; }
    [Required(ErrorMessage = "充值备注不能为空"), StringLength(1000)] public string Message { get; set; } = "";
}

public sealed class UserTopUpResultRequest
{
    [Range(1, long.MaxValue, ErrorMessage = "ID必须大于0")]
    public long Id { get; set; }
    [Required(ErrorMessage = "处理结果不能为空"), StringLength(1000)] public string Result { get; set; } = "";
}

/// <summary>充值二维码；非空、长度与 Base64 格式由 DTO 检查。</summary>
public sealed class UserTopUpQrcodeRequest : IValidatableObject
{
    [Required(ErrorMessage = "代理编码不能为空"), StringLength(50)] public string AgentCode { get; set; } = "";
    [Required(ErrorMessage = "二维码不能为空"), StringLength(2097152)] public string QrcodeBase64 { get; set; } = "";

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var content = QrcodeBase64;
        if (content.StartsWith("data:image/", StringComparison.OrdinalIgnoreCase))
        {
            int comma = content.IndexOf(',');
            if (comma < 0 || !content[..comma].EndsWith(";base64", StringComparison.OrdinalIgnoreCase))
            {
                yield return new ValidationResult("二维码格式错误", [nameof(QrcodeBase64)]);
                yield break;
            }
            content = content[(comma + 1)..];
        }
        bool valid;
        try { valid = Convert.FromBase64String(content).Length > 0; }
        catch (FormatException) { valid = false; }
        if (!valid) yield return new ValidationResult("二维码必须为有效的Base64数据", [nameof(QrcodeBase64)]);
    }
}