using YLErp.BLL;

namespace YLErp.CustomizedBizLogic
{
    public class BizLogicFD : BizLogicDefault
    {
        /// <summary>
        /// 生成客户编号
        /// 生成规则：例如 SAC-0001 ， SAC-为固定字符，最后四位是序列编号，从0001开始，每增加一个客户自动加1，序号最大值9999
        /// </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 clientObj, IQueryable<Client> clientDbQuery)
        {
            var prefix = "SAC-";
            if (string.IsNullOrWhiteSpace(clientObj.Number) || !clientObj.Number.StartsWith(prefix))
            {
                lock (_clientCodeLock)
                {
                    string result;
                    var existingClientCodes = clientDbQuery.Where(x => x.Number.Contains(prefix)).Select(x => x.Number).ToList();
                    if (existingClientCodes.Count == 0)
                    {
                        result = "0001";
                    }
                    else
                    {
                        var maxNumber = existingClientCodes.Max(x => parseNumber(x.Substring(4)));
                        var nextNum = maxNumber + 1;

                        if (nextNum < 10000)
                        {
                            result = nextNum.ToString("D4");
                        }
                        else
                        {
                            //如果大于9999，将生成SAC-10000等字符串，需求是说不会大于10000的
                            result = nextNum.ToString();
                        }
                    }

                    clientObj.Number = prefix + result;
                }
            }
        }

        /// <summary>
        /// 在交易确认前生成交易编号
        /// </summary>
        public override string GenerateTradeNumberBeforeConfirm(TradeNumberReqModel reqModel, YLContext db)
        {
            if (reqModel is null)
            {
                throw new ArgumentNullException(nameof(reqModel));
            }
            var maxNumber = reqModel.trade.TradeDate?.ToString("yyyyMMdd") + DateTime.Now.ToString("HHmmss");
            return maxNumber;
        }

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