namespace YLErp.DBModels
{
    /// <summary>
    /// 保证金配置期限常量定义（利率债TRS）
    /// </summary>
    public static class ConsMarginTerm
    {
        /// <summary>
        /// 5年以下（同时也是兜底默认期限）
        /// </summary>
        public const string UnderFiveYear = "<5y";

        /// <summary>
        /// 5年-10年
        /// </summary>
        public const string FiveToTenYear = "5y-10y";

        /// <summary>
        /// 10年-30年
        /// </summary>
        public const string TenToThirtyYear = "10y-30y";

        /// <summary>
        /// 30年以上
        /// </summary>
        public const string OverThirtyYear = ">30y";

        /// <summary>
        /// 所有允许的期限值
        /// </summary>
        public static readonly List<string> AllowedTerms = new List<string>
        {
            UnderFiveYear,
            FiveToTenYear,
            TenToThirtyYear,
            OverThirtyYear
        };

        /// <summary>
        /// 验证期限是否有效
        /// </summary>
        public static bool IsValidTerm(string term)
        {
            return AllowedTerms.Contains(term ?? string.Empty);
        }

        /// <summary>
        /// 获取期限的显示名称
        /// </summary>
        public static string GetDisplayName(string term)
        {
            return term switch
            {
                UnderFiveYear => "<5y",
                FiveToTenYear => "5y-10y",
                TenToThirtyYear => "10y-30y",
                OverThirtyYear => ">30y",
                _ => term ?? "<5y"
            };
        }
    }
}