using YLErp.BLL;

namespace YLErp.CustomizedBizLogic
{
    public class BizLogicXingYe : BizLogicDefault
    {
        //-------------------------------------------------------
        //交易编号优化：CIFDYYYYMMDDXX
        //前四个字母是CIFD，然后8位是开仓时间的年月日，最后两位是序号;
        //如果是一个组合，如牛市价差的话，两腿共用一个交易确认书编号，如：两腿分别是 CIFD2021090104-1 CIFD2021090104-2
        //-------------------------------------------------------

        /// <summary>
        /// 生成客户编号
        /// 生成规则：例如 CW20180001 ， CW为固定字符，加上4位年份， 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>
        public override void GenerateClientCode(Client clientObj, IQueryable<Client> clientDbQuery)
        {
            const string prefix = "CW";

            const int leftPartSize = 6;//CW+year

            if (string.IsNullOrWhiteSpace(clientObj.Number) || clientObj.Number.IndexOf(prefix) != 0)
            {
                lock (_clientCodeLock)
                {
                    var leftPart = prefix + DateTime.Now.Year.ToString();
                    var existingNumbers = clientDbQuery.Where(x => x.Number.StartsWith(leftPart)).Select(x => x.Number).ToArray();
                    var maxNumber = 0;
                    if (existingNumbers.Any())
                    {
                        maxNumber = existingNumbers.Max(x => int.TryParse(x.Substring(leftPartSize), out var number) ? number : 0);
                    }
                    clientObj.Number = leftPart + (maxNumber + 1).ToString().PadLeft(4, '0');
                }
            }
        }

        /// <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));
            }

            //对于对冲交易、场内交易等没有设置客户的
            if (reqModel.clientId == 0)
            {
                return DateTime.Now.ToString("yyyyMMddHHmmssfff");
            }

            //合并起来作为获取递增序号的取值条件
            var leftPart = "CIFD" + reqModel.trade.TradeDate?.ToString("yyyyMMdd");

            //获取数据库该用户最大的交易编号记录
            var tradeNumber = db.trade.Where(x => x.TradeNumber.StartsWith(leftPart) && x.ParentTradeId == 0).OrderByDescending(x => x.TradeNumber).Select(n => n.TradeNumber).FirstOrDefault() ?? string.Empty;

            if (reqModel.importTrades != null && reqModel.importTrades.Any())
            {
                //获取导入交易中该客户最大的交易编号记录
                var importTradeNumber = reqModel.importTrades.Where(x => x.TradeNumber.StartsWith(leftPart))
                    .OrderByDescending(x => x.TradeNumber).Select(n => n.TradeNumber).FirstOrDefault() ?? string.Empty;
                tradeNumber = tradeNumber.CompareTo(importTradeNumber) > 0 ? tradeNumber : importTradeNumber;
            }

            //获取总的该用户最大的交易编号记录
            int newNumber = string.IsNullOrWhiteSpace(tradeNumber) ? 1 : (int.Parse(tradeNumber.Substring(leftPart.Length)) + 1);

            return getTradeNumber(newNumber, leftPart, db);
        }

        private string getTradeNumber(int newNumber, string leftPart, YLContext db)
        {
            if (newNumber < 100)
            {
                var childTradeNumberPart = leftPart + newNumber.ToString("D2");
                if (db.trade.Any(x => x.TradeNumber.Contains(childTradeNumberPart) && x.ValidState != "InValid"))
                {
                    return getTradeNumber(newNumber + 1, leftPart, db);
                }
                else
                {
                    return leftPart + newNumber.ToString("D2");
                }
            }
            else
            {
                throw new Exception("该交易日最大交易编号" + (newNumber - 1) + "，超出了限制规则99，生成交易编号失败");
            }
        }
    }
}