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

namespace Store.Users.Services;

/// <summary>User 服务共用的手动参数检查。DTO 只保留非空规则，其余检查在服务层执行。</summary>
internal static class UserInputChecks
{
    public static void Length(string? value, int max, string name, int min = 0)
    {
        if (value != null && (value.Length < min || value.Length > max))
            throw new ValidationException(min > 0 ? $"{name}长度必须为{min}-{max}个字符" : $"{name}长度不能超过{max}个字符");
    }

    public static void PositiveId(long id)
    {
        if (id <= 0) throw new ValidationException("ID必须大于0");
    }

    private static void Group(byte? group)
    {
        if (group.HasValue && group.Value is not (3 or 4 or 5 or 8 or 9 or 10 or 11))
            throw new ValidationException("用户分组必须为3、4、5、8、9、10或11");
    }

    public static void Edit(UserEditRequest request)
    {
        Length(request.NickName, 50, "昵称");
        Length(request.Mobile, 30, "手机号");
        Length(request.CompanyName, 100, "公司名称");
        Length(request.Notes, 255, "备注");
        Length(request.CardId, 50, "卡号");
        Length(request.Authority, 1000, "权限");
        Length(request.ForbiddenPage, 1000, "禁止页面");
        Length(request.OemId, 50, "OEM编号");
        Group(request.GroupId);
        if (request.SaLevel.HasValue && request.SaLevel.Value is not (0 or 1))
            throw new ValidationException("管理员级别只能为0或1");
        if (request.ShopPointsPerMonth < 30) throw new ValidationException("每月续费积分不能低于30");
        if (request.PostagePerOrder is < 2.2m or > 999999m) throw new ValidationException("每单费用必须为2.2-999999元");
        if (request.RefundPostagePerOrder is < 2.5m or > 999999m) throw new ValidationException("退货费用必须为2.5-999999元");
        if (request.GiftOemAmountPerOrder is < 0m or > 999999m) throw new ValidationException("礼物附加费用必须为0-999999元");
        if (request.SyncLogisticsPerOrder is < 0m or > 999999m) throw new ValidationException("物流同步费用必须为0-999999元");
    }

    public static void Search(UserSearchRequest request)
    {
        if (request.Page is < 1 or > 1000000) throw new ValidationException("页码必须为1-1000000");
        if (request.PageSize is < 1 or > 200) throw new ValidationException("每页条数必须为1-200");
        Length(request.Keyword, 100, "查询关键字");
        Group(request.GroupId);
    }

    public static void Records(UserRecordSearchRequest request)
    {
        Search(request);
        Length(request.Operation, 20, "操作类型");
        Length(request.ShopId, 50, "店铺ID");
        Length(request.OrderId, 100, "订单ID");
        if (request.StartTime.HasValue && request.EndTime.HasValue && request.StartTime > request.EndTime)
            throw new ValidationException("开始时间不能晚于结束时间");
    }

    public static void Renew(ShopRenewRequest request)
    {
        Length(request.ShopId.Trim(), 50, "店铺ID");
        if (request.RenewDuration is < 1 or > 120) throw new ValidationException("续费时长必须为1-120个月");
        Length(request.Remark?.Trim(), 255, "备注");
    }

    public static void Qrcode(UserTopUpQrcodeRequest request)
    {
        Length(request.AgentCode, 50, "代理编码");
        Length(request.QrcodeBase64, 2 * 1024 * 1024, "二维码");
        var content = request.QrcodeBase64;
        if (content.StartsWith("data:image/", StringComparison.OrdinalIgnoreCase))
        {
            int comma = content.IndexOf(',');
            if (comma < 0 || !content[..comma].EndsWith(";base64", StringComparison.OrdinalIgnoreCase))
                throw new ValidationException("二维码格式错误");
            content = content[(comma + 1)..];
        }
        bool valid;
        try { valid = Convert.FromBase64String(content).Length > 0; }
        catch (FormatException) { valid = false; }
        if (!valid) throw new ValidationException("二维码必须为有效的Base64数据");
    }
}