using BaseOUDAL;
using YLErp.DBModels.Enums;
using YLErp.DBModels.Helpers;
using YLErp.Model.Enum;

namespace YLErp.Modules.ExchangeTradeModule
{
    /// <summary>
    /// 标的交易保存服务
    /// </summary>
    public class ExchangeTradeSaveService : ExchangeTradeSaveServiceBase
    {
        public ExchangeTradeSaveService(YLBaseService baseService) : base(baseService)
        {

        }

        public ExchangeTradeSaveService(OptUserInfo userInfo) : base(userInfo)
        {

        }

        public ExchangeTrade Save(ExchangeTrade req, TradeSourceEnum source)
        {
            var isAddNew = req.id == 0;

            Prepare(req, source, isAddNew);

            if (isAddNew)
            {
                DbContext.ExchangeTrade.Add(req);
                SaveExchangeTradePosition(req, null);
                DbContext.SaveChanges();
                return req;
            }
            else
            {
                var dbTrade = DbContext.ExchangeTrade.Find(req.id);

                if (dbTrade == null)
                {
                    throw new ServiceException("保存失败,数据不存在");
                }

                req.CreateTime = dbTrade.CreateTime;
                req.TradeNumber = dbTrade.TradeNumber;
                if (req.IsValid)
                {
                    SaveExchangeTradePosition(req, dbTrade);
                }
                else
                {
                    InValidTrade(req.id);
                }


                UpdateEntity(dbTrade, req);
                DbContext.SaveChanges();

                return dbTrade;
            }
        }

        private void Prepare(ExchangeTrade req, TradeSourceEnum source, bool isAddNew)
        {
            if (string.IsNullOrWhiteSpace(req.TradeType))
            {
                throw new ServiceException("交易类型 必须填写");
            }

            if (!ConsTrade.TradeTypesForHedge.Contains(req.TradeType)&&!ConsTrade.BondTypeList.Contains(req.TradeType))
            {
                throw new ServiceException("程序错误,标的交易类型不支持:" + req.TradeType);
            }

            //准备交易保存
            PrepareSave(req);

            req.OptId = UserId;
            req.OptName = UserName;
            req.OptDate = OptDate;

            if (isAddNew)
            {
                req.TradeSource = source.ToString();

                if (string.IsNullOrWhiteSpace(req.TradeNumber))
                {
                    req.TradeNumber = DateTime.Now.ToString("yyyyMMddHHmmssfff");
                }

                req.IsValid = true;
                req.CreateTime = DateTime.Now;
            }
        }

        //准备交易基础信息(标的、簿记、交易日期)
        private void PrepareSave(ExchangeTrade req)
        {
            if (req.TradeDate.Year < 2000)
            {
                throw new ServiceException("交易日期 填写错误:" + req.TradeDate.ToString("yyyy-MM-dd"));
            }

            ExchangeListOption exOption = null;

            if (req.TradeType == "场内期权")
            {
                SetTradeOptionInfo(req, req.OptionCode, out exOption);
            }

            //标的信息
            SetTradeUnderlyingInfo(req, req.UnderlyingCode, out var um);

            //--------------------------------------
            // 簿记帐户
            //--------------------------------------
            if (req.AssetBookId < 1)
            {
                throw new ServiceException("请选择簿记账户");
            }

            var assetUnit = DbContext.assetunit.Where(n => n.id == req.AssetBookId)
                   .Select(n => new AssetUnitDto { id = n.id, Name = n.Name, BookCategory = n.BookCategory, TraderIds = n.TraderIds, UserGroup = n.UserGroup }).FirstOrDefault();

            if (assetUnit == null)
            {
                throw new ServiceException("簿记账户不存在");
            }

            //--------------------------------------
            // 交易员信息
            //--------------------------------------

            //有交易员id，通过id查名字
            if (req.TraderId > 0)
            {
                req.TraderName = UserBLL.GetNameById(req.TraderId);
            }
            else
            {
                //当前登录用户作为交易员
                req.TraderId = UserId;
                req.TraderName = UserName;
            }

            //--------------------------------------
            // 对冲帐户
            //--------------------------------------
            if (req.ExchangeAccountId > 0)
            {
                req.ExchangeAccountCode = DbContext.exchange_account.Where(n => n.id == req.ExchangeAccountId).Select(n => n.AccountCode).FirstOrDefault();
            }

            //--------------------------------------
            // 检查交易权限
            //--------------------------------------
            if (req.TraderId < 1)
            {
                throw new ServiceException("请选择交易员");
            }

            //不检查:必须是交易员角色
            //不检查:交易用户组必须和簿记账户一致
            //不检查:交易员不在所选簿记中,请重新选择簿记
            //不检查:交易员具有交易标的的交易权限

            //--------------------------------------
            // 手续费
            //--------------------------------------
            switch (req.CommissionType)
            {
                case CommissionType.不收取:
                case CommissionType.系统计算:
                    req.Commission = 0;
                    break;
                default:
                    if (req.Commission < 0)
                    {
                        throw new ServiceException("请填写有效的交易手续费");
                    }
                    break;
            }

            //2020-09-11 改为以TradeAmount为主

            if (req.TradeAmount < 1e-5)
            {
                throw new ServiceException("交易数量必须大于0");
            }

            if (req.TradeType != "场内期权")
            {
                req.Notional = req.TradeAmount * um.CountRatio;
                req.TradeLots = req.Notional / um.ContractSize;
            }
            else
            {
                req.Notional = req.TradeAmount;
                req.TradeLots = req.Notional / (exOption.ContractSize < 1 ? um.ContractSize : exOption.ContractSize);
            }

            //验证股票结构类型，只能股票标的，商品期货只能期货
            switch (req.TradeType)
            {
                case "股票":
                    if (!um.CalcTypeIsStock())
                    {
                        throw new ServiceException("股票交易类型必须使用股票标的");
                    }
                    break;
                case "商品期货":
                    if (!um.IsFutures())
                    {
                        throw new ServiceException("商品期货交易类型必须填写期货标的");
                    }
                    break;
                case "商品现货":
                    if (!um.IsCommoditySpot())
                    {
                        throw new ServiceException("商品现货交易类型必须填写商品现货标的");
                    }
                    break;
                case "场内期权":
                    break;
            }

            if (req.TradeType != "场内期权")
            {
                req.OptionType = string.Empty;
            }
        }

        /// <summary>
        /// 删除交易
        /// </summary>
        public void InValidTrade(int id)
        {
            var dbTrade = DbContext.ExchangeTrade.Find(id);

            if (dbTrade == null)
            {
                throw new ServiceException("找不到交易信息");
            }

            dbTrade.IsValid = false;

            //清除对冲交易持仓
            var para = PrepareTradePositionParam(dbTrade);
            var dbPosition = DbContext.TradePosition.FirstOrDefault(para.predicate);
            if (dbPosition != null)
            {
                var dbNotional = TradeHelper.GetPositionNotional(para.tradeSide, dbTrade.Notional);
                dbPosition.Position -= dbNotional;
                dbPosition.PositionCost -= dbNotional * dbTrade.TradeSinglePrice;
                dbPosition.UpdateTime = OptDate;
            }

            DbContext.SaveChanges();
        }
    }
}