using YLErp.BLL;

namespace YLErp.CustomizedBizLogic
{
    public class BizLogicSywg : BizLogicDefault
    {
        /// <summary>
        /// 在交易确认前生成交易编号
        /// </summary>
        /// <returns></returns>
        public override string GenerateTradeNumberBeforeConfirm(TradeNumberReqModel reqModel, YLContext db)
        {
            return null;
        }

        /// <summary>
        /// 生成客户编号
        /// 生成规则：例如 IAM7， IAM为固定字符，7是序列编号，每增加一个客户自动加1
        /// </summary>
        /// <param name="initialCode">客户创建时的初始编号，如果没有传null</param>
        /// <param name="db"></param>
        public override void GenerateClientCode(Client clentObj, IQueryable<Client> clientDbQuery)
        {
            if (string.IsNullOrWhiteSpace(clentObj.Number))
            {
                const string PREFIX = "IAM";
                lock (_clientCodeLock)
                {
                    var existingClientCodes = clientDbQuery.Where(x => x.Number.Contains(PREFIX)).Select(x => x.Number).ToList();
                    //如果当前没有IAM开头的，从1开始计数
                    if (existingClientCodes.Count == 0)
                    {
                        clentObj.Number = "IAM1";
                    }
                    else
                    {
                        var maxNumber = existingClientCodes.Max(x => parseNumber(x.Substring(PREFIX.Length)));
                        var nextNum = maxNumber + 1;
                        clentObj.Number = PREFIX + nextNum.ToString();
                    }
                }
            }
        }

        private int parseNumber(string clientNumber)
        {
            var number = 0;
            int.TryParse(clientNumber, out number);
            return number;
        }
    }
}