using System.Text.RegularExpressions;
using YLErp.BLL;
using YLErp.Modules;

namespace YLErp.CustomizedBizLogic
{
    public class BizLogicGldh : 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)
        {
            if (reqModel is null)
            {
                throw new ArgumentNullException(nameof(reqModel));
            }

            var client = DataCacheProvider.GetClientDataSource().GetData(reqModel.clientId);
            if (!reqModel.valueDate.HasValue)
            {
                reqModel.valueDate = valuedateBLL.ValueDate;
            }
            if (string.IsNullOrEmpty(client.Code))
            {
                throw new Exception("该客户客户代码为空，生成交易编号失败");
            }
            string preTag = $"{client.Code}-{reqModel.valueDate.Value.ToString("yyMMdd")}";

            //获取数据库该用户当天最大的交易编号记录
            var tradeNumber = db.trade.Where(x => x.ClientId == reqModel.clientId && reqModel.valueDate.Value == x.TradeDate && x.TradeNumber.StartsWith(preTag))
                .OrderByDescending(x => x.TradeNumber).Select(n => n.TradeNumber).FirstOrDefault() ?? string.Empty;

            if (reqModel.importTrades != null && reqModel.importTrades.Count > 0)
            {
                //获取导入交易中该客户当天最大的交易编号记录
                var importTradeNumber = reqModel.importTrades.Where(x => x.ClientId == reqModel.clientId && reqModel.valueDate.Value == x.TradeDate && x.TradeNumber.Contains(preTag))
                    .OrderByDescending(x => x.TradeNumber).Select(n => n.TradeNumber).FirstOrDefault() ?? string.Empty;
                tradeNumber = tradeNumber.CompareTo(importTradeNumber) > 0 ? tradeNumber : importTradeNumber;
            }

            //获取总的该用户当天最大的交易编号记录
            int newNumber = 1;

            if (!string.IsNullOrWhiteSpace(tradeNumber) && tradeNumber.Length > preTag.Length)
            {
                var tradeNumStr = tradeNumber.Substring(preTag.Length);
                if (!string.IsNullOrEmpty(tradeNumStr) && tradeNumStr.IndexOf("-") > 0)
                {
                    tradeNumStr = tradeNumStr.Substring(0, tradeNumStr.IndexOf("-"));
                }
                if (!string.IsNullOrEmpty(tradeNumStr))
                {
                    if (!int.TryParse(tradeNumStr, out newNumber))
                    {
                        throw new ServiceFaultException("生成交易编号出错,未能从已存在的交易编号中解析出最大序号，此交易编号为:" + tradeNumber);
                    }
                    newNumber++;
                }
            }

            if (newNumber <= 999)
            {
                return preTag + newNumber.ToString("00");
            }
            else
            {
                throw new Exception("该客户存在最大交易编号" + (newNumber - 1) + "，超出了限制规则999，生成交易编号失败");
            }
        }

        public override void GenerateClientCode(Client clientObj, IQueryable<Client> clientDbQuery)
        {
            if (string.IsNullOrWhiteSpace(clientObj.Number))
            {
                lock (_clientCodeLock)
                {
                    var existClient = clientDbQuery.Where(x => x.Number.Length == 6).OrderByDescending(x => x.Number).FirstOrDefault();
                    int.TryParse(existClient?.Number, out var nextNum);
                    nextNum += 1;
                    if (nextNum < 1000000)
                    {
                        clientObj.Number = nextNum.ToString("D6");
                    }
                    else
                    {
                        throw new Exception("系统中已存在最大客户编号999999，生成客户编号失败");
                    }
                }
            }
        }
    }
}