using YLErp.BLL;
using YLErp.Modules;

namespace YLErp.CustomizedBizLogic
{
    public class BizLogicZL : BizLogicDefault
    {
        public override string GenerateTradeNumberBeforeConfirm(TradeNumberReqModel reqModel, YLContext db)
        {
            if (reqModel is null)
            {
                throw new ArgumentNullException(nameof(reqModel));
            }

            if (reqModel.trade.TradeDate == null)
            {
                throw new Exception("生成合同编号失败，请先确认该交易成交日期!");
            }

            var client = DataCacheProvider.GetClientDataSource().GetData(reqModel.clientId);
            if (client == null)
            {
                throw new Exception("未找到客户!");
            }
            var code = "";

            var trade = reqModel.trade;
            var prefix = "";
            var um = DataCacheProvider.GetUnderlyingDataSource().GetData(trade.UnderlyingCode);

            if (trade.TradeType == "收益互换")
            {
                prefix = "SW-" + client.Number + "-" + trade.TradeDate?.ToString("yyyyMMdd") + "-" + um.UnderlyingCode + "-";

                var tradeNumbers = db.trade.Where(O =>
                                   O.TradeNumber.StartsWith(prefix)
                                   && O.ValidState != "InValid").Select(O => O.TradeNumber).OrderByDescending(O => O);
                var tradeNumber = tradeNumbers.FirstOrDefault();
                var tradeCount = 1;
                if (string.IsNullOrWhiteSpace(tradeNumber) || !int.TryParse(tradeNumber.Substring(prefix.Length), out tradeCount))
                {
                    tradeCount = 1;
                }
                do
                {
                    code = $"{prefix}{tradeCount}";
                    tradeCount++;
                } while (tradeNumbers.Contains(code));
            }
            else
            {
                //期权累交易编号包含客户编号，但是序号在同一个交易日不区分客户，也就是同一个交易日，不同客户的序号也不能相同
                var dataCode = "";
                var tradeDateString = trade.TradeDate?.ToString("yyyyMMdd");
                prefix = client.Number + "-" + tradeDateString;

                var tradeNumbers = db.trade.Where(O =>
                                   O.TradeNumber.Contains(tradeDateString)
                                   && O.ValidState != "InValid").Select(O => O.TradeNumber).ToList();
                var numberStrings = tradeNumbers.Where(x => x.Contains(tradeDateString)).Select(x => new { number = x.Substring(x.Length - 4), preString = x.Substring(0, x.Length - 4) }).Where(x => int.TryParse(x.number, out var num) && x.preString.Contains(tradeDateString));
                var numberString = numberStrings.OrderByDescending(x => x.number).FirstOrDefault();
                var number = 1;
                if (string.IsNullOrWhiteSpace(numberString?.number) || !int.TryParse(numberString?.number, out number))
                {
                    number = 1;
                }
                do
                {
                    code = $"{prefix}{number.ToString().PadLeft(4, '0')}";
                    dataCode = $"{tradeDateString}{number.ToString().PadLeft(4, '0')}";
                    number++;
                } while (tradeNumbers.Any(x => x.Contains(dataCode)));
            }

            return code;
        }
    }
}