using MoreLinq.Extensions;
using Newtonsoft.Json;
using YLErp.BLL;
using YLErp.BLL.Eod;
using YLErp.DBModels.Enums;
using YLErp.Derivatives.Interest;
using YLErp.Helpers;
using YLErp.Modules.DataProviderModule;
using YLErp.Modules.EodModule;
using YLErp.Modules.SwapModule.Accrual;
using YLErp.Modules.SwapModule.FundingLegs;
using YLErp.Modules.SwapModule.Margin;
using YLErp.Modules.SwapModule.ReturnLegs;
using YLErp.Modules.TradeModule;
using YLErp.Modules.TradeModule.DealModule;
using YLErp.QdpModule;

namespace YLErp.Modules.SwapModule
{
    public class SwapDealService : SwapTradeBaseService
    {
        private static readonly IYcLogger Logger = LogFactory.GetLogger(nameof(SwapDealService));
        protected virtual bool TryGetFloatRate(DateTime valueDate, string underlyingCode, out double rate)
        {
            return EodPriceQueryService.TryGetPrice(valueDate, underlyingCode, out rate);
        }

        private IIndexFixer _indexFixer;
        /// <summary>FR007 取价器，委托 TryGetFloatRate（保留 virtual 接缝供测试 stub）。</summary>
        protected virtual IIndexFixer IndexFixer
            => _indexFixer ??= new SwapDealIndexFixer((d, c) =>
                TryGetFloatRate(d, c, out double r) ? (true, r) : (false, 0d));

        #region 可测试化接缝（Seams）——override 这些虚方法可在测试中替换 DB/外部调用，生产代码行为不变

        // FindTrade 已上提到基类 SwapTradeBaseService（三子类实现一致，消除重复）

        /// <summary>添加资金记录（生产: AddClientCashInCashOut；测试: 计数并记录金额）</summary>
        protected virtual int AddClientCash(trade td, double amount, string action, DateTime valueDate)
        {
            return AddClientCashInCashOut(td, amount, action, valueDate);
        }

        /// <summary>保存互换/平仓事件（生产: 落库+建事件；测试: 收集 unwindData 入内存列表）。
        /// 原 private 改 protected virtual，使测试 stub 可整体 override，规避内部 new SwapEventService 连库。</summary>
        protected virtual long SaveSwapDeal(UnwindData unwindData, int eventType, int clientCashId, string eventResason = "", bool approve = false)
        {
            UnwindNormalizer.NormalizeNotionalValues(unwindData);
            return SaveSwapDealInternal(unwindData, eventType, clientCashId, eventResason, approve);
        }

        // 待实现利息会进入 decimal(30,12) 日终快照；精度常量统一引用 InterestMath.FundingLegPrecision，消除重复定义。
        private const int InterestCalculationPrecision = InterestMath.FundingLegPrecision;

        // 客户现金在 SaveSwapDeal 之前创建，手工结算必须先收敛流水并重算汇总金额。
        private void NormalizeManualSettlementAmounts(UnwindData unwindData, int eventType, string eventReason)
        {
            if (!UnwindNormalizer.NormalizeSettledInterestAmounts(unwindData.FlowEvents, eventType, eventReason))
            {
                return;
            }

            if (unwindData.FlowEvents.Any(x => !string.IsNullOrEmpty(x.UnderlyingCode)))
            {
                CalcCloseAmount(unwindData);
                if (eventType == (int)SwapEventTypeEnum.互换)
                {
                    unwindData.SwapMarginAmount = 0;
                }
                return;
            }

            unwindData.SwapCloseAmount = Math.Round(unwindData.SwapCloseAmount, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
            unwindData.SwapRealizedPnL = Math.Round(unwindData.SwapRealizedPnL, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
        }

        /// <summary>保存所有变更（生产: DbContext.SaveChanges；测试: 空操作）</summary>
        protected virtual void SaveAllChanges()
        {
            DbContext.SaveChanges();
        }

        /// <summary>在事务中执行（生产: BeginTransaction/Commit/Rollback；测试: 直接执行不包事务）</summary>
        protected virtual void ExecuteInTransaction(Action action)
        {
            var trans = DbContext.Database.BeginTransaction();
            try
            {
                action();
                trans.Commit();
            }
            catch
            {
                trans.Rollback();
                throw;
            }
            finally
            {
                trans.Dispose();
            }
        }

        /// <summary>保存互换交易资金记录（生产: new ClientCashInCashOutService；测试: 空操作）。
        /// 仅 SwapUnwind 全平仓且 NeedOpenFee=false 时调用。</summary>
        protected virtual void CallSaveSwapTradeClientCash(trade td, DateTime valueDate)
        {
            td.trade_extend = DbContext.trade_extend.FirstOrDefault(x => x.TradeId == td.id);
            if (td.trade_extend != null && !td.trade_extend.ExtendObj.NeedOpenFee)
            {
                new ClientCashInCashOutService(this).SaveSwapTradeClientCash(td, td.TradePrice ?? 0, valueDate, 0);
            }
        }

        /// <summary>触发互换实时持仓计算（生产: Task.Run 异步 RealtimePnlCalc；测试: 空操作）。
        /// 仅 SwapUnwind 成功后调用。</summary>
        protected virtual void TriggerRealtimeSwapPosition()
        {
            Task.Run(() =>
            {
                try
                {
                    RealtimePnlCalc.RealtimeSwapPosition(new OptUserInfo(0, "互换实时持仓服务", OptUserFrom.Service));
                }
                catch (Exception ex)
                {
                    LogFactory.GetLogger<SwapDealService>().Error("互换实时持仓服务计算失败", ex);
                }
            });
        }

        /// <summary>查找待审核的互换/平仓事件（生产: DbContext.swap_event 查询；测试: 返回内存对象）</summary>
        protected virtual swap_event FindSwapEvent(int tradeId, int eventType)
        {
            return DbContext.swap_event
                .Where(x => x.SwapTradeId == tradeId && !x.Invalid && x.EventType == eventType)
                .OrderByDescending(o => o.id).FirstOrDefault();
        }

        /// <summary>查找事件关联的流水事件（生产: DbContext.swap_flow_event 查询；测试: 返回内存列表）</summary>
        protected virtual List<swap_flow_event> FindFlowEventsByEventId(long eventId)
        {
            return DbContext.swap_flow_event.Where(x => x.EventId == eventId).ToList();
        }

        /// <summary>平仓/互换审核的前置校验与状态设置（生产: new TradeUnwindService；测试: 空操作或计数）</summary>
        protected virtual void CloseReCheckSetTrade(int swapTradeId, bool isSwap, bool needCheck)
        {
            new TradeUnwindService(this).CloseReCheck_SetTrade(swapTradeId, isSwap, needCheck);
        }

        protected virtual DateTime GetMaxIncomeValueDate(trade td)
        {
            return td.ExerciseDate.Value.AddDays(-1);
        }

        #endregion

        public SwapDealService(OptUserInfo optUser) : base(optUser)
        {

        }
        public SwapDealService(YLBaseService baseService) : base(baseService)
        {

        }

        #region 前端盈亏只读校验（不阻断交易）


        /// <summary>
        /// 用 FrontendCalcReference 公式重算盈亏，与前端传来的 unwindData 比对，
        /// 差异 > 0.01 记 Error 日志。整体 try/catch 吞异常——校验自身错误绝不阻断交易。
        ///
        /// 目的：前端保持快速反馈（用户改输入立即算），后端不替代前端，仅做合理性兜底，
        /// 为将来公式统一积累"前后端差异"数据。
        /// 核心比对逻辑已抽到 SwapFrontendPnlValidator.BuildFrontendValidationDiffs 纯函数，便于单测覆盖。
        /// </summary>
        /// <param name="unwindData">前端算好传入的结算数据</param>
        /// <param name="isIncome">true=结息页(income公式)，false=平仓页(unwind公式)</param>
        private void ValidateFrontendPnL(UnwindData unwindData, bool isIncome)
        {
            try
            {
                var diffs = SwapFrontendPnlValidator.BuildFrontendValidationDiffs(unwindData, isIncome);
                if (diffs == null) return;

                // 取浮动腿用于日志上下文（与原实现一致）
                var floatLeg = unwindData.FlowEvents?.FirstOrDefault(x => !string.IsNullOrEmpty(x.UnderlyingCode));
                foreach (var d in diffs)
                {
                    Logger.Error($"[互换盈亏校验分歧] tradeId={unwindData.SwapTradeId} field={d.Field} frontend={d.FrontendValue} backend={d.BackendValue} diff={d.Delta} " +
                                 $"floatLeg=[gross={floatLeg?.PosiGrossPrice} avg={floatLeg?.TradingAmountAvg} qty={floatLeg?.Quantity} payDir={floatLeg?.PayDirection} posType={floatLeg?.PositionType}]");
                }
            }
            catch (Exception ex)
            {
                // 校验自身错误绝不阻断交易
                Logger.Error($"[互换盈亏校验异常] tradeId={unwindData.SwapTradeId} isIncome={isIncome}", ex);
            }
        }

        #endregion

        /// <summary>
        /// 平仓初始化
        /// </summary>
        /// <param name="tradeId"></param>
        /// <returns></returns>
        /// <exception cref="ServiceException"></exception>
        public UnwindData InitUnwind(int tradeId)
        {
            var td = DbContext.trade.Find(tradeId);
            var positions = DbContext.swap_position.ActiveByTrade(tradeId);
            var um = DataCacheProvider.GetUnderlyingDataSource().GetData(td.UnderlyingCode);
            bool commodity = ConsGlobal.InstrumentType.CalcTypeIsFutures(um.UnderlyingInstrumentType);
            List<int> eventTyps = new List<int>() { (int)SwapEventTypeEnum.自动互换, (int)SwapEventTypeEnum.互换 };
            var dealDate = valuedateBLL.ValueDate <= td.ExerciseDate.Value ? valuedateBLL.ValueDate : td.ExerciseDate.Value;
            //CheckLastEod(dealDate, td.TradeDate.Value, tradeId); //去掉平仓收盘限制
            var tradeExtend = DbContext.trade_extend.FirstOrDefault(x => x.TradeId == tradeId);
            td.trade_extend = tradeExtend;
            var position = positions.Where(x => !string.IsNullOrEmpty(x.UnderlyingCode) && !x.IsInitial).FirstOrDefault();
            var oriPosition = positions.Where(x => !string.IsNullOrEmpty(x.UnderlyingCode) && x.IsInitial).FirstOrDefault();
            var preDealDate = GetPreDealDate(tradeId, dealDate, eventTyps);
            var hasProcess = HasTradeProcess();
            swap_flow_event floatEvent = new swap_flow_event();
            UnwindData unwindData = new UnwindData();
            if (((valuedateBLL.SystemDate.CloseReCheck == 1) || (valuedateBLL.SystemDate.CloseReApprove == 1 && hasProcess)) && td.TradeStatus == ConsTrade.平仓待复核)
            {
                var swapEvent = GetSwapEvent(tradeId, (int)SwapEventTypeEnum.平仓);
                if (swapEvent == null)
                {
                    throw new Exception("该笔交易状态为平仓待复核，未找到相关记录，请检查该笔交易是否有效");
                }
                unwindData = swapEvent.unwindData;
            }
            else
            {
                unwindData.TradeStartDate = td.StartDate;
                unwindData.CloseType = commodity ? 1 : 2;
                unwindData.StartDate = td.TradeDate.Value;
                if (preDealDate.HasValue)
                {
                    unwindData.StartDate = preDealDate.Value;
                }
                unwindData.ValueDate = dealDate;
                unwindData.UnwindDate = dealDate;
                floatEvent.EventDate = dealDate;
                floatEvent.UnwindDate = unwindData.UnwindDate;
                floatEvent.PayDate = QdpCalendarHelper.GetNonHoliday(unwindData.UnwindDate.Value.AddDays(td.trade_extend.ExtendObj.SettlementRules));
                unwindData.PayDate = floatEvent.PayDate;
                floatEvent.SwapTradeId = tradeId;
                floatEvent.SwapTradeNo = td.TradeNumber;
                unwindData.SwapTradeId = tradeId;
                unwindData.StructureType = td.StructureType;
                unwindData.NotionalValue = Convert.ToDecimal(td.OriginalStockEqvNotional ?? 0);
                unwindData.NotionalQty = positions.Where(x => x.IsInitial).Sum(s => s.PosiQuantity);
                unwindData.PosiNotionalValue = Convert.ToDecimal(td.StockEqvNotional);
                unwindData.PositionQty = position != null ? position.PosiQuantity : Convert.ToDecimal(td.TradeAmount);
                unwindData.AnnualDays = tradeExtend == null ? 365 : tradeExtend.ExtendObj.AnnualDays;
                unwindData.CloseMethod = (int)CloseMethodEnum.全部平仓;
                // 占期初(original)语义(A)：默认"平掉剩余全部持仓" = 剩余名义本金/期初名义本金。
                // 未平仓时 PosiNotionalValue==NotionalValue → 1（平100%）；部分平仓后自动变为剩余比例（如已平10%则默认90%）。
                // 与互换/提前终止 InitIncome(L447) 保持一致。
                unwindData.ClosePercent = CalcDefaultInitClosePercent(unwindData.NotionalValue, unwindData.PosiNotionalValue);
                unwindData.CloseNotionalValue = unwindData.PosiNotionalValue;
                unwindData.CloseQty = unwindData.PositionQty;
                if (position != null)
                {
                    floatEvent.PositionId = position.PositionId;
                    floatEvent.EventType = (int)SwapEventTypeEnum.平仓;
                    floatEvent.EventReason = "交易";
                    // 方案C：分红收益改由上一收盘日 EOD PosiDividendSum 提供（单一可信源），
                    // 前端 getDivindIn 不再覆盖；消除"期初持仓×totalInterest"对已平仓部分的重复计入。
                    // 同一 EOD 值取一次喂两栏：
                    //   DividendIn     = "浮动端平仓盈亏·分红"（本次动作要落袋的，落库后被前端按需展示）
                    //   DividendPending = "待结算分红收益"（仍挂在账上、未来才结的存量 = PosiDividendSum 全量口径，
                    //                    见 GetPreEodDividendSum 注释的口径论证；切勿改回硬0或分摊，会落库回归）
                    decimal preEodDividendSum = GetPreEodDividendSum(tradeId, position.PositionId, dealDate);
                    Logger.Info($"[分红-平仓预览] 方案C DividendIn=DividendPending=PosiDividendSum全量 tradeId={tradeId} positionId={position.PositionId} dealDate={dealDate:yyyy-MM-dd} 值={preEodDividendSum}");
                    floatEvent.DividendIn = preEodDividendSum;
                    floatEvent.DividendPending = preEodDividendSum;
                    floatEvent.UnderlyingCode = position.UnderlyingCode;
                    floatEvent.UnderlyingInstrumentType = position.UnderlyingInstrumentType;
                    floatEvent.CloseFee = 0;
                    floatEvent.BeforeCloseFee = oriPosition.PosiTradingFeePending;
                    floatEvent.TradingFee = TradingFeeCalc.CalcInitTradingFee(oriPosition, unwindData);
                    floatEvent.PosiTradingFeeUnit = oriPosition?.PosiTradingFeeUnit ?? 0;
                    floatEvent.PosiFeeType = oriPosition?.PosiFeeType ?? 0;
                    floatEvent.MarkClosePnl = 0;
                    floatEvent.PayDirection = position.PosiDirection;
                    floatEvent.PosiGrossPrice = position.PosiGrossPrice;
                    floatEvent.PosiNetPrice = position.PosiNetPrice;
                    floatEvent.TradingAmountNetAvg = position.PosiNetNoFeePrice;
                    floatEvent.PositionType = position.PositionType;
                    floatEvent.TradingAmountNetFeeAvg = position.PosiNetFeePrice;
                    floatEvent.Quantity = position.PosiQuantity;
                    floatEvent.PositionQty = 0;
                    floatEvent.ContractSize = position.ContractSize;
                    floatEvent.TradingAmount = floatEvent.Quantity * floatEvent.ContractSize;
                    var ratio = -DirectionRatio.ReceivePay(position.PosiDirection);
                    floatEvent.TradingFeePending = TradingFeeCalc.CalcInitTradingFeePending(oriPosition, position, unwindData);
                    floatEvent.DataState = (int)SwapFlowDateStateEnum.完成;
                    floatEvent.InterestMode = position.InterestMode;
                    floatEvent.ClientId = td.ClientId;
                    floatEvent.SetOpt(UserInfo);
                }
                unwindData.FlowEvents.Add(floatEvent);
            }
            return unwindData;
        }
        /// <summary>
        /// 校验上日是否收盘
        /// </summary>
        /// <param name="tradeId"></param>
        public void CheckEodTrade(int tradeId)
        {
            var td = DbContext.trade.Find(tradeId);
            var dealDate = valuedateBLL.ValueDate <= td.ExerciseDate.Value ? valuedateBLL.ValueDate : td.ExerciseDate.Value;
            //CheckLastEod(dealDate, td.StartDate.Value, tradeId);
        }
        /// <summary>
        /// 校验收益结算操作（不检查收盘限制）
        /// </summary>
        /// <param name="tradeId"></param>
        public void CheckEodTradeForIncome(int tradeId)
        {
            var td = DbContext.trade.Find(tradeId);
            // 收益结算不检查收盘限制，只检查交易状态
            if (td.TradeType != "收益互换")
            {
                throw new ServiceException("该交易不是收益互换类型");
            }
            if (td.ValidState == "InValid")
            {
                throw new ServiceException("该交易已无效");
            }
            if (td.TradeStatus != ConsTrade.确认成交 && td.TradeStatus != ConsTrade.提前终止拒绝)
            {
                throw new ServiceException($"该交易状态为【{td.TradeStatus}】，无法进行收益结算");
            }
        }
        /// <summary>
        /// 多空组合 平仓初始化
        /// </summary>
        /// <param name="tradeId"></param>
        /// <returns></returns>
        /// <exception cref="ServiceException"></exception>
        /// <summary>
        /// 平仓初始化
        /// </summary>
        /// <param name="tradeId"></param>
        /// <returns></returns>
        /// <exception cref="ServiceException"></exception>
        public UnwindData InitIncome(int tradeId)
        {
            var checkEventTypes = new List<int>() { (int)SwapEventTypeEnum.互换, (int)SwapEventTypeEnum.自动互换 };
            var td = DbContext.trade.Find(tradeId);
            var positions = DbContext.swap_position.ActiveByTrade(tradeId);
            var um = DataCacheProvider.GetUnderlyingDataSource().GetData(td.UnderlyingCode);
            List<int> eventTypes = new List<int>() { (int)SwapFlowEventTypeEnum.互换, (int)SwapFlowEventTypeEnum.自动互换 };
            var maxIncomeValueDate = GetMaxIncomeValueDate(td);
            var dealDate = valuedateBLL.ValueDate.Date > maxIncomeValueDate.Date ? maxIncomeValueDate : valuedateBLL.ValueDate;
            // 收益结算不检查收盘限制
            var tradeExtend = DbContext.trade_extend.FirstOrDefault(x => x.TradeId == tradeId);
            td.trade_extend = tradeExtend;
            var position = positions.Where(x => !string.IsNullOrEmpty(x.UnderlyingCode) && !x.IsInitial).FirstOrDefault();
            //var preSettleDate = CheckLastEod(dealDate, td.StartDate.Value, tradeId);//上一交易日期
            var preDealDate = GetPreDealDate(tradeId, dealDate, eventTypes);
            var hasProcess = HasTradeProcess();
            swap_flow_event floatEvent = new swap_flow_event();
            UnwindData unwindData = new UnwindData();
            if (((valuedateBLL.SystemDate.CloseReCheck == 1) || (valuedateBLL.SystemDate.CloseReApprove == 1 && hasProcess)) && td.TradeStatus == ConsTrade.互换待复核)
            {
                var swapEvent = GetSwapEvent(tradeId, (int)SwapEventTypeEnum.互换);
                if (swapEvent == null)
                {
                    throw new Exception("该笔交易状态为平仓待复核，未找到相关记录，请检查该笔交易是否有效");
                }
                unwindData = swapEvent.unwindData;
            }
            else
            {
                unwindData.StartDate = td.TradeDate.Value;
                if (preDealDate.HasValue)
                {
                    unwindData.StartDate = preDealDate.Value;
                }
                unwindData.TradeStartDate = td.StartDate;
                unwindData.ValueDate = dealDate;
                unwindData.UnwindDate = dealDate;
                floatEvent.UnwindDate = unwindData.UnwindDate;
                floatEvent.EventDate = dealDate;
                unwindData.PayDate = valuedateBLL.ValueDate;
                floatEvent.PayDate = unwindData.PayDate;
                floatEvent.SwapTradeId = tradeId;
                floatEvent.SwapTradeNo = td.TradeNumber;
                floatEvent.EventType = (int)SwapFlowEventTypeEnum.互换;
                floatEvent.EventReason = "交易";
                unwindData.SwapTradeId = tradeId;
                unwindData.StructureType = td.StructureType;
                unwindData.NotionalValue = Convert.ToDecimal(td.OriginalStockEqvNotional ?? 0);
                unwindData.NotionalQty = positions.Where(x => x.IsInitial).Sum(s => s.PosiQuantity);
                unwindData.PosiNotionalValue = Convert.ToDecimal(td.StockEqvNotional);
                unwindData.PositionQty = position != null ? position.PosiQuantity : Convert.ToDecimal(td.TradeAmount);
                unwindData.AnnualDays = tradeExtend == null ? 365 : tradeExtend.ExtendObj.AnnualDays;
                unwindData.ClosePercent = unwindData.PosiNotionalValue / unwindData.NotionalValue;
                unwindData.CloseNotionalValue = unwindData.PosiNotionalValue;
                if (position != null)
                {
                    floatEvent.PositionId = position.PositionId;
                    // 方案C：分红收益改由上一收盘日 EOD PosiDividendSum 提供（单一可信源），
                    // 前端 getDivindIn 不再覆盖；消除"期初持仓×totalInterest"对已平仓部分的重复计入。
                    decimal preEodDividendSum = GetPreEodDividendSum(tradeId, position.PositionId, dealDate);
                    Logger.Info($"[分红-收益结算] DividendIn=PosiDividendSum全量 tradeId={tradeId} positionId={position.PositionId} dealDate={dealDate:yyyy-MM-dd} 值={preEodDividendSum}");
                    floatEvent.DividendIn = preEodDividendSum;
                    floatEvent.UnderlyingCode = position.UnderlyingCode;
                    floatEvent.UnderlyingInstrumentType = position.UnderlyingInstrumentType;
                    floatEvent.CloseFee = 0;
                    floatEvent.MarkClosePnl = 0;
                    floatEvent.PayDirection = position.PosiDirection;
                    floatEvent.PosiGrossPrice = position.PosiGrossPrice;
                    floatEvent.PosiNetPrice = position.PosiNetPrice;
                    // 注意：TradingAmountNetAvg 字段名为"成交净价(期末语义)"，但收益结算/平仓初始化时装入的是期初净价(PosiNetNoFeePrice)，前端展示期初净价时取此字段
                    floatEvent.TradingAmountNetAvg = position.PosiNetNoFeePrice;
                    floatEvent.TradingAmountNetFeeAvg = position.PosiNetFeePrice;
                    floatEvent.PositionType = position.PositionType;
                    floatEvent.Quantity = position.PosiQuantity;
                    floatEvent.PositionQty = 0;
                    floatEvent.ContractSize = position.ContractSize;
                    floatEvent.TradingAmount = floatEvent.Quantity * floatEvent.ContractSize;
                    floatEvent.ClientId = td.ClientId;
                    floatEvent.DataState = (int)SwapFlowDateStateEnum.完成;
                }
                unwindData.FlowEvents.Add(floatEvent);
            }
            unwindData.MaxIncomeValueDate = maxIncomeValueDate;
            return unwindData;
        }
        /// <summary>
        /// 获取平仓利息端信息
        /// </summary>
        /// <param name="valueDate">平仓日期</param>
        /// <param name="tradeId">交易id</param>
        /// <param name="closePercent">平仓比例</param>
        /// <returns></returns>
        /// <exception cref="ServiceException"></exception>
        public List<swap_flow_event> GetUnwindInterests(DateTime valueDate, DateTime unwindDate, int tradeId, decimal closePercent, int eventType)
        {
            List<swap_flow_event> interests = new List<swap_flow_event>();
            if (closePercent > 1)
            {
                closePercent = 1;//防篡改
            }
            else if (closePercent < 0)
            {
                closePercent = 0;
            }
            var td = DbContext.trade.Find(tradeId);
            if (td == null)
            {
                throw new ServiceException("未找到交易信息");
            }
            var allpositions = DbContext.swap_position.ActiveByTrade(tradeId).ToList();
            var origPositions = allpositions.Where(x => x.IsInitial).ToList();
            var realPostitions = allpositions.Where(x => !x.IsInitial).ToList();
            // 根因修复(多次部分平仓预付金返还错误)：见 ResolveInterestLegPositions 注释。
            // 迭代源仍用 origPositions(保留 orig.id → eod_swap_position.PositionId 的日终匹配)，
            // 仅对预付金腿以实时腿的剩余本金克隆覆盖，故此处不改任何日终匹配行为。
            var positions = ResolveInterestLegPositions(origPositions, realPostitions);
            var tradeExtend = DbContext.trade_extend.FirstOrDefault(x => x.TradeId == tradeId);
            List<int> eventTypes = new List<int>() { (int)SwapEventTypeEnum.平仓, (int)SwapEventTypeEnum.互换, (int)SwapEventTypeEnum.自动互换 };
            var lastEod = DbContext.eod_swap.Where(x => x.ValueDate < unwindDate && x.SwapTradeId == tradeId).OrderByDescending(o => o.ValueDate).FirstOrDefault();
            var _preSetteDate = lastEod == null ? unwindDate.AddDays(-1) : lastEod.ValueDate;
            List<eod_swap_position> lastEodPositions = new SwapEodPositionService(this).GetPreEodPositions(tradeId, _preSetteDate);//上一交易数据
            var stockEqvNotional = realPostitions.Where(x => x.PosiDirection > 0).Sum(s => s.PosiNotionalValue); // 当前平仓前的实时剩余本金
            var posiNotionalValue = stockEqvNotional * closePercent;// 本次平仓名义本金
            var orginPv = ResolveUnwindPreviousNotional(lastEod, lastEodPositions, stockEqvNotional); // 上一日终的浮动端本金
            var grossPrice = realPostitions.Where(x => x.PosiDirection > 0).FirstOrDefault()?.PosiGrossPrice;
            var closeList = DbContext.swap_flow_event.Where(x => x.SwapTradeId == tradeId 
                                                                 && x.UnwindDate == unwindDate 
                                                                 && eventTypes.Contains(x.EventType) 
                                                                 && x.DataState == (int)SwapFlowDateStateEnum.完成).ToList();
            bool tdClose = closeList.Count > 0;
            // 显式入口：平仓前剩余本金 + 实际平掉额 + B语义比例，盘中重放（语义见 InterestCalcRequest.IntradayUnwind）
            interests = GetIntradayUnwindInterests(InterestCalcRequest.IntradayUnwind(
                td, tradeExtend, valueDate, unwindDate, lastEodPositions, positions,
                stockEqvNotional, posiNotionalValue,
                closePercent, eventType, tdClose, orginPv, add: true, newCalcLast: false, closeList));
            return interests;
        }

        /// <summary>
        /// 解析利息腿(PosiDirection==0)持仓，供 GetUnwindInterests 使用。抽为纯函数以便无库单测。
        /// <para>根因(多次部分平仓预付金返还错误)：预付金腿(初始/追加)的"当前剩余本金"存于实时持仓
        /// realPositions.InterestPrincipalFix，每次平仓由 UpdateInitalPosition 递减；而原始腿
        /// origPositions(IsInitial=1)的 InterestPrincipalFix 恒为初始值。GetInterests 算
        /// closePrincipal = Fix × closePercent 时读 position.InterestPrincipalFix，若沿用原始腿，
        /// 会在多次部分平仓后仍返还/计算初始本金(如始终 99000)。</para>
        /// <para>修复：迭代源仍用 origPositions(保留 orig.id → eod_swap_position.PositionId 的日终匹配，
        /// 全库实测 eod 均按 orig.id 归档；若换 realPositions 会破坏 preEod 匹配导致利息重算错误)，仅对预付金腿
        /// Clone 覆盖其本金值为实时腿的剩余本金。real 与 orig 通过 real.PositionId == orig.id 精确 1:1 关联。
        /// 首次平仓时 orig==real 行为不变；仅在发生过部分平仓后 real≠orig 时用实时腿本金纠正。</para>
        /// </summary>
        /// <param name="origPositions">原始腿(IsInitial=1)全集</param>
        /// <param name="realPositions">实时腿(IsInitial=0)全集，其 PositionId 指向对应 orig 的 id</param>
        /// <returns>利息腿(PosiDirection==0)列表：预付金腿本金已对齐实时剩余本金，其余保持原始腿</returns>
        public static List<swap_position> ResolveInterestLegPositions(List<swap_position> origPositions, List<swap_position> realPositions)
        {
            realPositions ??= new List<swap_position>();
            return origPositions.Where(x => x.PosiDirection == 0).Select(p =>
            {
                if (MarginModes.Contains(p.InterestMode))
                {
                    var realLeg = realPositions.FirstOrDefault(r => r.PositionId == p.id);
                    if (realLeg != null && realLeg.InterestPrincipalFix != p.InterestPrincipalFix)
                    {
                        var clone = p.Clone();
                        clone.InterestPrincipalFix = realLeg.InterestPrincipalFix;
                        return clone;
                    }
                }
                return p;
            }).ToList();
        }
        
        /// <summary>
        /// 计算预付金腿当前真实持仓 （当前持仓+未来持仓）
        /// </summary>
        /// <param name="origPositions"></param>
        /// <param name="realPositions"></param>
        /// <param name="completedFlowEvents"></param>
        /// <param name="settleDate"></param>
        /// <returns></returns>
        public static List<swap_position> ResolveInterestLegPositionsAsOf(
            List<swap_position> origPositions, List<swap_position> realPositions,
            IEnumerable<swap_flow_event> completedFlowEvents, DateTime settleDate)
        {
            realPositions ??= new List<swap_position>();
            var futureFlows = (completedFlowEvents ?? Enumerable.Empty<swap_flow_event>())
                .Where(x => x.EventType == (int)SwapEventTypeEnum.平仓 && x.EventDate > settleDate)
                .ToList();
            var originalNotional = origPositions.Where(x => x.PosiDirection > 0)
                .Sum(x => x.PosiNotionalValue);
            var futureCloseNotional = futureFlows.Where(x => x.PositionType > 0)
                .Sum(x => x.TradingAmount);
            var hasNotionalFlows = futureCloseNotional > 0 && originalNotional > 0;
            var futureClosePrincipal = futureFlows
                .Where(x => MarginModes.Contains(x.InterestMode))
                .GroupBy(x => x.PositionId)
                .ToDictionary(x => x.Key, x => x.Sum(v => v.InterestPrincipal));
            return origPositions.Where(x => x.PosiDirection == 0).Select(p =>
            {
                if (MarginModes.Contains(p.InterestMode))
                {
                    var realLeg = realPositions.FirstOrDefault(r => r.PositionId == p.id);
                    if (realLeg != null)
                    {
                        var futurePrincipal = hasNotionalFlows
                            ? p.InterestPrincipalFix * futureCloseNotional / originalNotional
                            : futureClosePrincipal.TryGetValue(p.id, out var flowPrincipal) ? flowPrincipal : 0m;
                        var asOfPrincipal = realLeg.InterestPrincipalFix + futurePrincipal;
                        asOfPrincipal = Math.Min(p.InterestPrincipalFix, Math.Max(0m, asOfPrincipal));
                        if (asOfPrincipal != p.InterestPrincipalFix)
                        {
                            var clone = p.Clone();
                            clone.InterestPrincipalFix = asOfPrincipal;
                            return clone;
                        }
                    }
                }
                return p;
            }).ToList();
        }

        public static decimal ResolveUnwindPreviousNotional(
            eod_swap lastEod,
            IEnumerable<eod_swap_position> lastEodPositions,
            decimal currentNotional)
            => ClosePercentMath.ResolveUnwindPreviousNotional(lastEod, lastEodPositions, currentNotional);

        /// <summary>
        /// 获取利息腿"已通过历史互换结出的累计利息"（用于复利重算时扣除，类比分红的 CalcConsumedDividend）。
        /// 数据源为事件级 swap_flow_event.InterestAmount（互换/自动互换 完成态事件，互换当时即落库，不依赖日终归档）。
        /// </summary>
        /// <param name="tradeId">交易id</param>
        /// <param name="positionId">利息腿id</param>
        /// <param name="beforeDate">结算日（不含，仅汇总此日之前的历史已结利息；当日事件由 closeList 去重逻辑单独处理）</param>
        /// <returns>历史已结利息累计金额（绝对值）</returns>
        public virtual decimal GetConsumedInterest(int tradeId, long positionId, DateTime beforeDate)
        {
            List<int> swapEventTypes = new List<int>() { (int)SwapEventTypeEnum.互换, (int)SwapEventTypeEnum.自动互换 };
            var consumed = DbContext.swap_flow_event
                .Where(x => x.SwapTradeId == tradeId && x.PositionId == positionId
                    && swapEventTypes.Contains(x.EventType)
                    && x.DataState == (int)SwapFlowDateStateEnum.完成
                    && x.EventDate < beforeDate)
                .Sum(s => (decimal?)s.InterestAmount) ?? 0m;
            return consumed;
        }

        /// <summary>
        /// 计算利息腿计息详细
        /// </summary>
        /// <param name="td">交易</param>
        /// <param name="tradeExtend">交易扩展数据</param>
        /// <param name="valueDate">操作日期</param>
        /// <param name="eodPositions">上一日终持仓</param>
        /// <param name="positions">期初利率端</param>
        /// <param name="posiNotionalValue">持仓名义本金</param>
        /// <param name="closePosiNotionalValue">平仓名义本金</param>
        /// <param name="closePrecent"></param>
        /// <param name="eventType"></param>
        /// <param name="tdClose"></param>
        /// <param name="add"></param>
        /// <returns></returns>
        /// <summary>
        /// 【盘中平仓/互换结息】显式入口——GetInterests(settment:false) 盘中语义的具名封装（2026-08 显式化重构）。
        /// 语义契约见 InterestCalcRequest.IntradayUnwind 工厂注释；计息走 CalcUnwindInterest 全区间重放。
        /// </summary>
        public List<swap_flow_event> GetIntradayUnwindInterests(InterestCalcRequest req)
            => GetInterests(req.Td, req.TradeExtend, req.ValueDate, req.UnwindDate, req.EodPositions, req.Positions,
                req.PosiNotionalValue, req.ClosePosiNotionalValue,
                req.ClosePercent, req.EventType, req.TdClose,
                req.OrginPv, req.Add, settment: false, req.NewCalcLast, req.CloseList);

        public List<swap_flow_event> GetInterests(
            trade td,
            trade_extend tradeExtend,
            DateTime valueDate,
            DateTime unwindDate,
            List<eod_swap_position> eodPositions,
            List<swap_position> positions,
            decimal posiNotionalValue,
            decimal closePosiNotionalValue,
            decimal closePrecent,
            int eventType,
            bool tdClose,
            decimal orginPv,
            bool add = false,
            bool settment = true,
            bool newCalcLast= false,
            List<swap_flow_event> closeList = null)
        {
            List<swap_flow_event> interests = new List<swap_flow_event>();
            var annualDays = tradeExtend == null ? 365 : tradeExtend.ExtendObj.AnnualDays;
            bool calcFirst = tradeExtend?.ExtendObj.InterestCalcMode?.StartsWith("1") ?? true;
            bool calcLast = tradeExtend?.ExtendObj.InterestCalcMode.EndsWith("1") ?? true;
            foreach (var position in positions)
            {
                // 初始化持仓信息
                var preEodPosition = eodPositions.FirstOrDefault(x => x.PositionId == position.id) ?? new eod_swap_position();
                var positionClone = position.Clone();
                DateTime? preDealDate = preEodPosition.id != 0 ? preEodPosition.ValueDate : null;

                // 计算计息区间
                int interestPeriod = position.interest_rest_days ?? 1;
                // true 跳过 不计利息； false 正常利息
                bool swap = InitInterestDate(unwindDate, preDealDate, td, tdClose, out DateTime startDate, out DateTime endDate);

                // 计算名义本金
                decimal closePrincipal;
                decimal posiPrincipal;
                decimal newClosePercent = closePrecent;
                var mode = (InterestModeEnum)position.InterestMode;

                if (MarginModes.Contains(position.InterestMode))
                {
                    // 保证金腿: 计息基数 = InterestPrincipalFix(保证金余额)
                    closePrincipal = position.InterestPrincipalFix * closePrecent;
                    posiPrincipal = position.InterestPrincipalFix;
                }
                else
                {
                    // 融资腿(1/2/9): 走策略工厂
                    var r = FundingLegStrategyFactory.Get(mode)
                        .CalcNotional(position.InterestPrincipalFix, posiNotionalValue, closePrecent);
                    closePrincipal = r.ClosePrincipal;
                    posiPrincipal = r.PosiPrincipal;
                    newClosePercent = r.ClosePercent;
                }
                // 根因位置：SwapEodPositionService.SaveAutoEodWithCloseInterestPosition 在平仓后收盘时传入
                // “收盘后剩余本金 + closePercent=1”，与盘中“平仓前本金 + 实际关闭比例”不是同一语义。
                // GetInterests 同时被盘中试算和 EOD 平仓后收盘调用：后者传入的
                // posiNotionalValue 是收盘后的剩余本金，closePosiNotionalValue 才是本次实际平掉的本金。
                // 例如平仓前 100、平掉 30、收盘后剩余 70 时，EOD 传入 posi=70、close=30、closePercent=1。
                // 模式2(合约名义本金规模)的本次结息本金必须始终是实际平仓额，因此无条件覆盖，
                // 否则会错误地用剩余 70 结算本次平掉的 30。模式9(标的期初全价)的部分平仓
                // 仍保留既有的剩余/复利动态本金承接逻辑；仅最终全平时 posi=0，才覆盖以避免结息本金为 0。
                if ((InterestModeEnum)position.InterestMode == InterestModeEnum.合约名义本金规模
                    || ((InterestModeEnum)position.InterestMode == InterestModeEnum.标的期初全价
                        && posiNotionalValue == 0m))
                {
                    closePrincipal = closePosiNotionalValue;
                }
                if (MarginModes.Contains(position.InterestMode))
                {
                    positionClone.InterestDirection = MarginCalc.FlipDirection(position.InterestDirection);
                }

                // 获取利率
                decimal rate = Math.Round(GetFixedRate(position, unwindDate), InterestCalculationPrecision, MidpointRounding.AwayFromZero); // 做精度调整 原数据有精度误差
                decimal floatRate = GetFloatRate(position, preEodPosition, td.StartDate.Value, endDate, interestPeriod, swap, positionClone);

                // 根据场景计算利息
                if (MarginModes.Contains(position.InterestMode))
                {
                    // 保证金腿(5/6)：专属计息，notional 直接取保证金余额，无融资腿差分公式与 orginPv 维度 hack
                    interests.Add(CalcMarginInterest(td, valueDate, endDate, positionClone, rate, closePrincipal, posiPrincipal,
                        newClosePercent, annualDays, calcFirst, calcLast||newCalcLast, preEodPosition, eventType, add, settment, swap));
                }
                else if (settment)
                {
                    // 收盘归档场景，使用 CalcEodInterest
                    interests.Add(CalcEodInterest(td, valueDate, positionClone, rate, floatRate, closePrincipal, posiPrincipal, annualDays, calcFirst, calcLast, preEodPosition, eventType, add));
                }
                else
                {
                    // 盘中互换场景，使用 CalcUnwindInterest
                    // 取历史已结利息（事件级，互换当时落库），供复利重算扣除（仅复利需要；单利基于日终快照自带状态）
                    var consumedInterest = position.InterestType == (int)InterestTypeEnum.复利
                        ? GetConsumedInterest(td.id, position.id, endDate)
                        : 0m;
                    interests.Add(CalcUnwindInterest(td, valueDate, endDate, positionClone, rate, floatRate, posiPrincipal,
                        closePrincipal, newClosePercent, annualDays, preEodPosition, eventType, add, swap, orginPv, calcFirst,
                        calcLast||newCalcLast, consumedInterest));
                }
            }
            //当日有平仓或互换记录时，避免重复结算
            if (closeList != null && closeList.Count > 0)
            {
                foreach (var item in interests)
                {
                    var closeEvent = closeList.Where(x => x.PositionId == item.PositionId);
                    if (eventType == (int)SwapEventTypeEnum.互换 || eventType == (int)SwapEventTypeEnum.自动互换)
                    {
                        // 互换：该仓位当天有同类型的完成事件，直接归0
                        var swapCloseEvent = closeEvent.Where(x => x.EventType == eventType);
                        if (swapCloseEvent.Any())
                        {
                            item.InterestAmount = 0;
                            item.TdInterestAmount = 0;
                            item.InterestClosePnL = 0;
                        }
                    }
                    else if (!calcLast && !newCalcLast)
                    {
                        // 平仓不算尾：扣除已结算的利息（算尾时利息已包含关闭日，无重叠）
                        var closePnl = closeEvent.Sum(s => s.InterestClosePnL);
                        var closeAmount = closeEvent.Sum(s => s.InterestAmount);
                        var closeTdAmount = closeEvent.Sum(s => s.TdInterestAmount);
                        item.InterestAmount = item.InterestAmount - closeAmount;
                        item.TdInterestAmount = item.TdInterestAmount - closeTdAmount;
                        item.InterestClosePnL = item.InterestClosePnL - closePnl;
                    }
                }
            }
            return interests;
        }

        /// <summary>
        /// 平仓比例口径转换（解决"显示占期初 / 计算占剩余"双语义问题）。
        /// 前端与事件列表展示用"占期初(original)"语义(A)；后端计息基数计算 / 费用递减 /
        /// 全平判定均按"占剩余(remaining)"语义(B)消费。
        ///   A → B：B = A × 期初名义本金(NotionalValue) / 剩余名义本金(PosiNotionalValue)，并 cap 到 1。
        ///   B → A：A = B × 剩余名义本金 / 期初名义本金。
        /// 分母为 0（无持仓等异常场景）时原样返回，避免除零。
        /// </summary>
        public static decimal ToRemainingClosePercent(decimal originalClosePercent, decimal notionalValue, decimal posiNotionalValue)
            => ClosePercentMath.ToRemainingClosePercent(originalClosePercent, notionalValue, posiNotionalValue);

        /// <summary>
        /// B(占剩余) → A(占期初)，用于落库 / 事件列表展示还原。见 ToRemainingClosePercent。
        /// </summary>
        public static decimal ToOriginalClosePercent(decimal remainingClosePercent, decimal notionalValue, decimal posiNotionalValue)
            => ClosePercentMath.ToOriginalClosePercent(remainingClosePercent, notionalValue, posiNotionalValue);

        /// <summary>
        /// 计算 InitUnwind 默认占期初(A)平仓比例 = PosiNotionalValue / NotionalValue。
        /// </summary>
        public static decimal CalcDefaultInitClosePercent(decimal notionalValue, decimal posiNotionalValue)
            => ClosePercentMath.CalcDefaultInitClosePercent(notionalValue, posiNotionalValue);

        /// <summary>
        /// 读取"上一收盘日"浮动腿的待实现分红（eod_swap_position.PosiDividendSum），
        /// 用于平仓/互换预览页展示"浮动端平仓盈亏·分红(DividendIn)" 与 "待结算分红收益(DividendPending)"。
        /// <para>方案C：替代前端 totalInterest × 期初持仓 的重算——后者会把登记日前已平仓、
        /// 不享有该笔分红的部分重复计入（GLMS-20260105-0004 误显 -36,160）。
        /// EOD 的 PosiDividendSum 已按"实际持仓递推 + 当日实现扣除"算出待实现分红，
        /// 是单一可信源。</para>
        /// <para>复用 GetUnwindInterests(cs:624-626) 的"上一 EOD 日期"推导：取 eod_swap 中
        /// ValueDate &lt; dealDate 的最大日期，无则 dealDate.AddDays(-1)；再经
        /// SwapEodPositionService.GetPreEodPositions 取该日持仓，匹配 PositionId。</para>
        /// <para>抽为 protected virtual：与 GetMaxIncomeValueDate 一致，便于测试替身覆写、
        /// 也兼容无 EOD 的边界（返回 0，与历史 DividendIn=0 行为一致）。</para>
        /// </summary>
        /// <returns>上一收盘日该浮动腿的待实现分红；无 EOD 记录返回 0</returns>
        /// <remarks>
        /// 【口径论证·勿改】为什么 DividendPending 也用本方法的全量值（非分摊、非硬0）：
        /// <para>1. 字段语义直接对应：EOD PosiDividendSum 的 DisplayName="浮动端平仓盈亏·分红未实现"
        ///   (EodSwapPosition.cs:186)，递推式 PosiDividendSum=前日+当日新计-当日实现
        ///   (SwapEodPositionService.cs:1825)，即"扣过当日实现后、还挂在账上未来才结的存量"。
        ///   前端列"待结算分红收益"(SwapflowList.js:561) 字面就是同一回事 → 直接取 PosiDividendSum。</para>
        /// <para>2. 是"存量"非"流量"：DividendPending 描述的是"账上还欠多少"（与本次平仓比例无关的总额），
        ///   而 DividendIn 才是"本次动作落袋多少"。两者口径本就不同，各自正确。若把 DividendPending 改成
        ///   按本次平仓比例分摊，会把"存量"误当"流量"，与列名"待结算"矛盾。</para>
        /// <para>3. 历史教训：方案C 初版曾把前端 DividendPending 硬编码 0（commit e3c473ba），因测试交易
        ///   PosiDividendSum 恰好=0（3/2 已全额互换）而测试通过、掩盖问题。但对 PosiDividendSum≠0 的部分
        ///   平仓交易，硬0 会落库（SwapFlowEventService.cs:588 冲账取负写入 swap_flow_event.DividendPending）
        ///   并在事件列表"待结算分红收益"列显示错误的 0 —— 这是确定的回归。故本方法返回值同时喂两栏，
        ///   前端不得再覆盖。例外：互换页 DividendPending 保持 0（互换语义=全量结清，结清后待结算归0）。</para>
        /// </remarks>
        protected virtual decimal GetPreEodDividendSum(int tradeId, long positionId, DateTime dealDate)
        {
            var preEod = GetPreEodPositionByDate(tradeId, positionId, dealDate);
            var sum = preEod == null ? 0m : preEod.PosiDividendSum;
            Logger.Info($"[分红-读取] GetPreEodDividendSum tradeId={tradeId} positionId={positionId} dealDate={dealDate:yyyy-MM-dd} 取EOD日期={(preEod?.ValueDate):yyyy-MM-dd} PosiDividendSum={sum}");
            return sum;
        }

        /// <summary>
        /// 取 dealDate 对应"上一收盘日"持仓的累计分红快照。
        /// GLMS-20260105-0006：登记日当天手动平仓/互换时，当日 EOD 快照已含分红，应取到当日而非 T-1。
        /// 故由 ValueDate 严格小于 dealDate 改为 小于等于：当日 EOD 存在则读当日，否则回退上一收盘日（原口径不变）。
        /// </summary>
        protected virtual eod_swap_position GetPreEodPositionByDate(int tradeId, long positionId, DateTime dealDate)
        {
            var lastEod = QueryPreEodSwaps(tradeId)
                .Where(x => x.ValueDate <= dealDate)
                .OrderByDescending(o => o.ValueDate).FirstOrDefault();
            var preEodDate = lastEod == null ? dealDate.AddDays(-1) : lastEod.ValueDate;
            Logger.Info($"[分红-快照定位] GetPreEodPositionByDate tradeId={tradeId} positionId={positionId} dealDate={dealDate:yyyy-MM-dd} 取<=当日EOD, 命中日期={(lastEod?.ValueDate):yyyy-MM-dd}, 回退={lastEod == null}");
            return QueryPreEodPosition(tradeId, positionId, preEodDate);
        }

        /// <summary>可测性 seam：返回某交易的全部 eod_swap 行（不做日期过滤）。测试可 override 注入内存数据。</summary>
        protected virtual IQueryable<eod_swap> QueryPreEodSwaps(int tradeId)
            => DbContext.eod_swap.Where(x => x.SwapTradeId == tradeId);

        /// <summary>可测性 seam：取指定收盘日的持仓累计分红快照。测试可 override 注入内存数据。</summary>
        protected virtual eod_swap_position QueryPreEodPosition(int tradeId, long positionId, DateTime valueDate)
            => new SwapEodPositionService(this)
                .GetPreEodPositions(tradeId, valueDate)
                .FirstOrDefault(x => x.PositionId == positionId);

        /// <summary>
        /// 获取固定利率
        /// </summary>
        private decimal GetFixedRate(swap_position position, DateTime startDate)
        {
            var swapIntervalToday = position.SwapIntervalList?.Where(x => x.Date <= startDate).OrderByDescending(o => o.Date).FirstOrDefault();
            if (swapIntervalToday != null) return swapIntervalToday.Rate;
            var nextInterval = position.SwapIntervalList?.Where(x => x.Date > startDate).OrderBy(o => o.Date).FirstOrDefault();
            return nextInterval?.Rate ?? position.InterestRateDefault;
        }

        /// <summary>
        /// 获取浮动利率
        /// </summary>
        private decimal GetFloatRate(swap_position position, eod_swap_position preEod, DateTime startDate, DateTime endDate, int period, bool swap, swap_position positionClone)
        {
            if (string.IsNullOrEmpty(position.FloatRateUnderlyingCode)) return position.FloatRate;

            int days = (endDate - startDate).Days;
            DateTime rateDate = IndexFixerBase.GetFixingDate(
                days % period == 0 ? endDate : startDate, position.interest_rule);

            if (preEod.id != 0 && days % period != 0)
            {
                position.FloatRate = positionClone.FloatRate = preEod.FloatRate;
                return preEod.FloatRate;
            }

            if (IndexFixer.TryGetFixing(rateDate, position.FloatRateUnderlyingCode, out decimal rate))
            {
                position.FloatRate = positionClone.FloatRate = rate;
                return position.FloatRate;
            }
            if (!swap) throw new Exception($"获取不到{position.FloatRateUnderlyingCode}在{rateDate:yyyy年MM月dd日}的价格");
            return 0m;
        }

        /// <summary>
        /// 计算收盘利息（EOD）
        /// </summary>
        private swap_flow_event CalcEodInterest(trade td, DateTime valueDate, swap_position position, decimal rate, decimal floatRate, decimal closePrincipal, decimal posiPrincipal, int annualDays, bool calcFirst, bool calcLast, eod_swap_position preEod, int eventType, bool add)
        {
            // 判断当日是否计息：首日不算头或到期日不算尾则不计息
            bool calcToday = true;
            if (calcFirst == false && valueDate == td.StartDate.Value) calcToday = false; // 首日不算头
            if (calcLast == false && valueDate == td.ExerciseDate.Value) calcToday = false; // 到期日不算尾
            if (valueDate < position.PosiStartDate)
            {
                calcToday = false;
            }
            // 初始化EOD持仓信息
            if (preEod.id == 0)
            {
                preEod.FloatRate = floatRate;
                preEod.TdInterestPrincipal = posiPrincipal;
                preEod.PosiNotionalValue = posiPrincipal;
            }

            // 构建利息事件
            var interest = new swap_flow_event
            {
                SwapTradeId = td.id,
                SwapTradeNo = td.TradeNumber,
                EventType = eventType,
                EventReason = "交易",
                EventDate = valueDate,
                PositionId = position.id,
                InterestDirection = position.InterestDirection,
                InterestRate = rate,
                InterestPrincipal = closePrincipal,
                InterestSwapInterval = position.InterestSwapInterval,
                InterestMode = position.InterestMode,
                FloatRate = floatRate,
                DataState = (int)SwapFlowDateStateEnum.完成,
                ClientId = td.ClientId,
                UnwindDate = valueDate
            };
            // 收盘场景使用 preEod.FloatRate（历史浮动利率），与 InitSwapDealInterest 收盘场景保持一致
            decimal eodFloatRate = preEod.id != 0 ? preEod.FloatRate : floatRate;
            decimal interestAmount = 0;
            decimal tdInterestAmount = 0;
            if (calcToday)
            {
                if (position.InterestType == (int)InterestTypeEnum.复利)
                {
                    // 复利计算
                    CalcDailyCompoundInterestByEod(preEod, valueDate, td.StartDate.Value, position, closePrincipal, posiPrincipal, interest, annualDays, eodFloatRate, 1m, ref interestAmount, ref tdInterestAmount);
                }
                else
                {
                    // 单利计算
                    CalcDailySimpleInterestByEod(preEod, valueDate, td.StartDate.Value, position, closePrincipal, posiPrincipal, interest, annualDays, eodFloatRate, 1m, ref interestAmount, ref tdInterestAmount);
                }

            }
            // 四舍五入并赋值
            interest.InterestAmount = Math.Round(interestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
            interest.TdInterestAmount = Math.Round(tdInterestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
            // 计算InterestClosePnL（方向：收取=1为正，支付=-1为负）
            var interestRatio = DirectionRatio.ReceivePay(position.InterestDirection);
            interest.InterestClosePnL = interest.InterestAmount * interestRatio;

            if (add) UpdateDbOption(interest);
            return interest;
        }

        /// <summary>
        /// 保证金腿（InterestMode 5/6）专属计息——替代 CalcEodInterest/CalcUnwindInterest 对保证金的处理。
        ///
        /// 保证金是纯固定利率单利：浮动利率(FR007)/分段利率/复利对其均为死分支（前端无入口、
        /// 确认书不含、FundingLegRate.Build 对空 FloatRateUnderlyingCode 恒返回 Fixed）。故本方法直接用
        /// SimpleInterestAccrual 纯函数计息，本金取保证金余额：
        ///   EOD  = 昨日终本金 preEod.TdInterestPrincipal（与旧 CalcDailySimpleInterestByEod 同源，无差分）
        ///   盘中 = accrualBasis（preEod.TdInterestPrincipal + posiPrincipal - orginPv）
        /// 盘中保留差分是必要的：posiPrincipal 是否经 ResolveInterestLegPositions 对齐到实时剩余是路径相关的
        /// （生产对齐 / 诊断测试用原始腿），单一本金变量无法覆盖两种状态，差分经 orginPv 自适应。orginPv 在
        /// 本方法内部按保证金维度计算（PreviousBalance），消除原 InitSwapDealInterest 的外部维度 hack
        /// （融资腿 orginPv=浮动端名义本金）。保留累计语义（priorAccrued + 增量），满足下游字段契约。
        /// </summary>
        /// <remarks>
        /// 前提（由前端保证金表单 + SwapTradeService 构造保证）：
        /// 1. <b>InterestType=单利</b>。本方法恒走 SimpleInterestAccrual 单利，不查 InterestType；
        ///    若库内 InterestMode=5/6 且 InterestType=复利(脏数据)，会与旧 CalcEodInterest 复利分支不一致。
        /// 2. <b>rate 由 GetFixedRate 提供</b>（SwapDealService.cs:866）——从 SwapIntervalList 取 <c>Date ≤ unwindDate</c> 最近段的 Rate，
        ///    空表/单段时返回 InterestRateDefault。SwapIntervalList 是"互换观察日排期"（阶梯利率表 + 结息日历，非 FR007 浮动——
        ///    浮动由 FloatRateUnderlyingCode + interest_rest_days 独立驱动）；保证金前端亦开放"设置观察日"分段录入。
        ///    盘中用该 rate 覆盖全程，与旧 CalcDailySimpleInterest 完全一致（BuildSegmentRates 的 spread 同样是 GetFixedRate 单一值全程，
        ///    不按 SwapIntervalList 切段）——SwapIntervalList 阶梯利率在盘中半路变更的精细处理是既有未覆盖口径，非本次引入；
        ///    EOD 路径因每日重取 GetFixedRate(valueDate) 故能正确反映阶梯。
        /// 契约与副作用：
        /// 3. <b>position.InterestDirection 须已由调用方翻转</b>（GetInterests:742 FlipDirection）；本方法不翻转。
        /// 4. <b>preEod 在 id==0 时被就地修改</b>（设 TdInterestPrincipal/PosiNotionalValue/FloatRate），与旧 CalcEodInterest 一致。
        /// 定位：SwapCalcTrace 落盘 AccrueEod/AccrualPeriod 的 notional/days/rate/accrued；盘中 accrualBasis 可从 trace 的 notional 反推。
        /// </remarks>
        /// <param name="settment">true=收盘归档(EOD)，false=盘中平仓/互换。</param>
        /// <param name="swap">互换事件（仅盘中生效，true 时利息归零，同 InitSwapDealInterest）。</param>
        public swap_flow_event CalcMarginInterest(
            trade td, DateTime valueDate, DateTime endDate, swap_position position, decimal rate,
            decimal closePrincipal, decimal posiPrincipal, decimal closePercent,
            int annualDays, bool calcFirst, bool calcLast,
            eod_swap_position preEod, int eventType, bool add, bool settment, bool swap)
        {
            // 当日是否计息（算头算尾）——同 CalcEodInterest
            bool calcToday = true;
            if (!calcFirst && valueDate == td.StartDate.Value) calcToday = false;
            if (!calcLast && valueDate == td.ExerciseDate.Value) calcToday = false;
            if (valueDate < position.PosiStartDate) calcToday = false;

            // 首日初始化 preEod——同 CalcEodInterest
            if (preEod.id == 0)
            {
                preEod.FloatRate = 0m;
                preEod.TdInterestPrincipal = posiPrincipal;
                preEod.PosiNotionalValue = posiPrincipal;
            }

            // 字段映射（保证金 FloatRate 恒 0；方向 position.InterestDirection 已由 GetInterests 翻转）
            var interest = new swap_flow_event
            {
                SwapTradeId = td.id,
                SwapTradeNo = td.TradeNumber,
                EventType = eventType,
                EventReason = "交易",
                EventDate = valueDate,
                PositionId = position.id,
                InterestDirection = position.InterestDirection,
                InterestRate = rate,
                InterestPrincipal = closePrincipal,
                InterestSwapInterval = position.InterestSwapInterval,
                InterestMode = position.InterestMode,
                FloatRate = 0m,
                DataState = (int)SwapFlowDateStateEnum.完成,
                ClientId = td.ClientId,
                UnwindDate = settment ? valueDate : endDate
            };

            // 互换事件：利息归零（同 InitSwapDealInterest）
            if (swap && !settment)
            {
                interest.InterestAmount = 0m;
                interest.TdInterestAmount = 0m;
                interest.InterestClosePnL = 0m;
                if (add) UpdateDbOption(interest);
                return interest;
            }

            decimal interestAmount = 0m;
            decimal tdInterestAmount = 0m;
            var legRate = FundingLegRate.Fixed(rate);   // 保证金纯固定（无浮动）

            if (calcToday)
            {
                if (settment)
                {
                    // EOD：单日增量，累计 = 昨日累计 + 今日增量；notional = 昨日终本金（无差分）
                    var policy = AccrualPolicy.BuildEod(position, annualDays, isCompound: false);
                    var r = SimpleInterestAccrual.AccrueEod(
                        priorAccrued: preEod.InterestProfitSum,
                        priorNotional: preEod.TdInterestPrincipal,
                        unwindFraction: 1m,
                        rate: legRate, policy: policy, eodDate: valueDate);
                    interestAmount = r.Accrued;
                    tdInterestAmount = r.AccruedToday;
                }
                else
                {
                    // 盘中：accrualBasis 自适应"实时剩余本金"——posiPrincipal 已对齐(ResolveInterestLegPositions)
                    // 时 = posiPrincipal；未对齐的原始腿经 orginPv(=PreviousBalance 昨日终) 修正回昨日终剩余。
                    // 单一本金变量无法覆盖两种 position 状态，故保留差分（与 EOD 直接用 preEod.TdInterestPrincipal 不同）。
                    // orginPv 在此内部按保证金维度计算，消除原 InitSwapDealInterest 的外部维度 hack。
                    var orginPv = MarginCalc.PreviousBalance(preEod, posiPrincipal);
                    var accrualBasis = preEod.TdInterestPrincipal + posiPrincipal - orginPv;
                    var segmentRates = new List<(DateTime, decimal)> { (position.PosiStartDate, rate) };
                    var r = SimpleInterestAccrual.AccruePeriod(
                        priorAccrued: preEod.InterestProfitSum * closePercent,
                        notional: accrualBasis,
                        unwindFraction: closePercent,
                        segmentRates: segmentRates,
                        startDate: position.PosiStartDate,
                        endDate: endDate,
                        priorValueDate: preEod.ValueDate,
                        boundary: AccrualBoundary.Of(calcFirst, calcLast),
                        annualDays: annualDays,
                        isAnnualized: position.IsAnnualized);
                    interestAmount = r.Accrued;
                    tdInterestAmount = r.AccruedToday;
                    interest.InterestPrincipal = accrualBasis * closePercent;   // 同 CalcDailySimpleInterest:1304
                }
            }

            interest.InterestAmount = Math.Round(interestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
            interest.TdInterestAmount = Math.Round(tdInterestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
            var interestRatio = DirectionRatio.ReceivePay(position.InterestDirection);
            interest.InterestClosePnL = interest.InterestAmount * interestRatio;

            if (add) UpdateDbOption(interest);
            return interest;
        }

        /// <summary>
        /// 计算盘中利息（平仓/互换）
        /// </summary>
        private swap_flow_event CalcUnwindInterest(trade td, DateTime valueDate, DateTime endDate,  swap_position position, decimal rate, decimal floatRate, decimal posiPrincipal, decimal closePrincipal, decimal closePercent, int annualDays, eod_swap_position preEod, int eventType, bool add, bool swap, decimal orginPv, bool calcFirst, bool calcLast, decimal consumedInterest = 0m)
        {
            if (preEod.id == 0)
            {
                preEod.FloatRate = floatRate;
                preEod.TdInterestPrincipal = posiPrincipal;
                preEod.PosiNotionalValue = posiPrincipal;
                preEod.ValueDate = td.StartDate.Value;
                if (calcFirst)
                {
                    preEod.ValueDate = preEod.ValueDate.AddDays(-1);
                }
            }

            return InitSwapDealInterest(td, valueDate, endDate,  rate, position, add, swap, posiPrincipal,
                closePrincipal, closePercent, annualDays, eventType, preEod,
                orginPv, calcFirst, calcLast, consumedInterest);
        }
        /// <summary>
        /// 写入保证金的资金记录：应付预付金(SwapMarginAmount)和预付金返息(SwapMarginRebatePnl)。
        /// 依赖实例方法 AddClientCash/AddClientCashInCashOut，暂留此处。
        /// </summary>
        private void RecordMarginCashFlow(trade td, UnwindData unwindData)
            => RecordMarginCashFlow(td, unwindData.ValueDate,
                unwindData.SwapMarginAmount, unwindData.SwapMarginRebatePnl,
                AddClientCashInCashOut);

        /// <summary>
        /// 写入保证金资金记录的通用重载，接受资金写入委托。
        /// AddClientCash(virtual,测试可stub) 和 AddClientCashInCashOut(非virtual,直接写库)
        /// 都可通过此重载统一。
        /// </summary>
        private void RecordMarginCashFlow(trade td, DateTime valueDate,
            decimal marginAmount, decimal marginRebate,
            Func<trade, double, string, DateTime, int> writeCash)
        {
            if (marginAmount != 0)
                writeCash(td, Convert.ToDouble(marginAmount), ClientCashInCashOut.系统操作_应付预付金, valueDate);
            if (marginRebate != 0)
                writeCash(td, Convert.ToDouble(-marginRebate), ClientCashInCashOut.系统操作_预付金返息, valueDate);
        }

        /// <summary>
        /// 初始化利息腿信息
        /// </summary>
        /// <param name="tradeId">交易编码</param>
        /// <param name="valueDate">计息开始日期</param>
        /// <param name="endDate">计息结束日期</param>
        /// <param name="rate">计息年化利率</param>
        /// <param name="position">利息腿</param>
        /// <param name="add">是否新增</param>
        /// <param name="swap">是否已互换</param>
        /// <param name="preEodPosition">上一日终归档</param>
        /// <param name="posiNotionalValue">当日适用名义本金</param>
        /// <param name="closePosiNotionalValue">当日平仓名义本金</param>
        /// <param name="annualDays">年化天数</param>
        /// <returns></returns>
        private swap_flow_event InitSwapDealInterest(trade td,
            DateTime valueDate,
            DateTime endDate,
            decimal rate,
            swap_position position,
            bool add,
            bool swap,
            decimal posiNotionalValue,
            decimal closePosiNotionalValue,
            decimal closePrecent,
            int annualDays,
            int eventType,
            eod_swap_position preEodPosition,
            decimal orginPv,
            bool calcFirst,
            bool calcLast,
            decimal consumedInterest = 0m
            )
        {
            decimal interestProfitSum = preEodPosition.InterestProfitSum;
            swap_flow_event interest = new swap_flow_event();
            interest.SwapTradeId = td.id;
            interest.SwapTradeNo = td.TradeNumber;
            interest.EventType = eventType;
            interest.EventReason = "交易";
            interest.EventDate = valueDate;
            interest.PositionId = position.id;
            interest.InterestDirection = position.InterestDirection;
            interest.InterestRate = rate;
            interest.InterestPrincipal = closePosiNotionalValue;
            interest.InterestSwapInterval = position.InterestSwapInterval;
            interest.InterestMode = position.InterestMode;
            interest.FloatRate = position.FloatRate;
            interest.DataState = (int)SwapFlowDateStateEnum.完成;
            interest.ClientId = td.ClientId;
            interest.UnwindDate = endDate;

            // 保证金腿已走 CalcMarginInterest（不经过本方法），orginPv 维度重映射不再需要；
            // orginPv 此处仅对融资腿生效（差分公式 accrualBasis = TdInterestPrincipal + posiPrincipal - orginPv）。

            if (swap)
            {
                interest.InterestAmount = 0; // 利息金额
                interest.TdInterestAmount = 0; // 当日新增利息
                interest.InterestAmount = 0;
                interest.InterestClosePnL = 0; // 利息端平仓盈亏
            }
            else
            {
                decimal InterestAmount = 0;
                decimal TdInterestAmount = 0;
                var interestRatio = DirectionRatio.ReceivePay(position.InterestDirection);
                var floateRate = preEodPosition.FloatRate;
                if (position.InterestType == (int)InterestTypeEnum.复利)
                {
                    var daysFromStart = (endDate - position.PosiStartDate).Days;
                    var daysFromPreEod = preEodPosition.id != 0
                        ? (endDate - preEodPosition.ValueDate).Days
                        : 0;
                    // 不算尾 + 当日即新周期首日 + 未到重置日   ==> 说明这一天应归入下一个计息周期 当天无需单独计息
                    if (!calcLast && daysFromPreEod == 1 && daysFromStart % (position.interest_rest_days ?? 1) != 0)
                    {
                        interest.InterestPrincipal = preEodPosition.TdInterestPrincipal * closePrecent; // 计息基数
                        interest.FloatRate = preEodPosition.FloatRate;
                        InterestAmount = preEodPosition.InterestIncomeSum * closePrecent;  // 利息金额 = 待实现 * 平仓比例
                        TdInterestAmount = preEodPosition.InterestIncomeSum; // 当日新增利息
                        interest.InterestAmount = Math.Round(InterestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
                        interest.TdInterestAmount = Math.Round(TdInterestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
                        interest.InterestClosePnL = interest.InterestAmount * interestRatio; // 利息端平仓盈亏 = 利息金额 * 方向
                        return interest;
                    }
                    // remainingPercent 只用于把上一日待实现分配给本次计算对应的本金。
                    // 按照利息腿的实际 计息基数 重新计算一个历史待实现利息的 平仓比例。不替代全局的平仓比例
                    // 部分平仓计算关闭 30% 时取 30%；最终全平剩余仓位时取 100%。
                    var remainingPercent = preEodPosition.TdInterestPrincipal > 0m
                        ? closePosiNotionalValue / preEodPosition.TdInterestPrincipal
                        : 1m;
                    remainingPercent = Math.Max(0m, Math.Min(1m, remainingPercent));
                    // resetCarryInterest 是重置日并入复利本金的历史待实现，不是当天新增利息。
                    // 把上日尚未实现的的利息 按本次平掉的这部分计息基数分给本次平仓 并在重置日并入计息基数
                    // 它只在当前 endDate 恰好为重置日时使用，避免把同一笔历史利息重复资本化。
                    var resetCarryInterest = preEodPosition.InterestIncomeSum * remainingPercent;
                    CalcDailyCompoundInterest(endDate, position, closePosiNotionalValue, interest, annualDays,
                        floateRate, closePrecent, calcFirst, calcLast, ref InterestAmount, ref TdInterestAmount,
                        consumedInterest, resetCarryInterest);
                    if (preEodPosition.id != 0 && closePrecent == 1m)
                    {
                        // 最终全平只重放上一日终之后的新增利息；历史部分平仓的两位结算尾差已在日终待实现中。
                        // InterestAmount 是本次最终应结金额；TdInterestAmount 是不按关闭比例缩放的参考累计值。
                        // 二者在全平时都以上一日 InterestIncomeSum 为起点，保证之前攒下的尾差最后一次带走。
                        var interestAtEnd = new swap_flow_event { InterestRate = rate };
                        decimal amountAtEnd = 0m;
                        decimal tdAmountAtEnd = 0m;
                        // InitInterestDate 在最终日不算尾时会先把 endDate 回拨一天；
                        // 历史差分的 amountAtEnd 需补回该日，但计算器仍使用交易 calcLast，
                        // 并将重放日期限制在合约到期日，避免提前全平或超期重复计息。
                        // 如果算尾 重放日 = 正常到期日
                        // 不算尾 且未超过到期日 重放日 = endDate+1 (补齐不算尾那天漏计的利息)
                        // 加1天超过到期日 截断到到期日
                        var replayEndDate = endDate;
                        if (!calcLast && endDate < valueDate)
                        {
                            replayEndDate = endDate.AddDays(1);
                            if (replayEndDate > td.ExerciseDate.Value)
                            {
                                replayEndDate = td.ExerciseDate.Value;
                            }
                        }
                        // 计算截至本次平仓日的累计利息 amountAtEnd
                        CalcDailyCompoundInterest(replayEndDate, position, closePosiNotionalValue,
                            interestAtEnd, annualDays, floateRate, closePrecent,
                            calcFirst, calcLast, ref amountAtEnd, ref tdAmountAtEnd, consumedInterest);
                        var interestAtPreviousEod = new swap_flow_event { InterestRate = rate };
                        decimal amountAtPreviousEod = 0m;
                        decimal tdAmountAtPreviousEod = 0m;
                        // 最终日重放仍遵守交易的 calcLast；上一日终是历史截点而非合约尾日，
                        // 因此此处按闭区间包含上一日终当天，避免算头不算尾时重复加入该日利息。
                        // 计算截至上一日终累积的利息 amountAtPreviousEod
                        CalcDailyCompoundInterest(preEodPosition.ValueDate, position, closePosiNotionalValue,
                            interestAtPreviousEod, annualDays, floateRate, closePrecent,
                            calcFirst, true, ref amountAtPreviousEod, ref tdAmountAtPreviousEod, consumedInterest);
                        // 例如 0004：5/18 待实现 -118631.261797，加 5/19 新增约 -4648.912760，
                        // 得到最终应结 -123280.174557，按金额两位落为 Excel BN 的 -123280.17。
                        // 上一日终已保存的待实现利息 + 截至平仓日累计利息 - 截至上一日终累计利息
                        // 这样只带走“上一日终以后新增的利息”，同时保留历史部分平仓时因两位金额结算留下的尾差，最终全平一次性结清。
                        InterestAmount = preEodPosition.InterestIncomeSum + amountAtEnd - amountAtPreviousEod;
                        TdInterestAmount = preEodPosition.InterestIncomeSum + tdAmountAtEnd - tdAmountAtPreviousEod;
                    }
                }
                else
                {
                    CalcDailySimpleInterest(preEodPosition, endDate, position, posiNotionalValue, interest, annualDays, floateRate, closePrecent, orginPv, calcFirst, calcLast, ref InterestAmount, ref TdInterestAmount);
                }

                interest.InterestAmount = Math.Round(InterestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
                interest.TdInterestAmount = Math.Round(TdInterestAmount, InterestCalculationPrecision, MidpointRounding.AwayFromZero);
                interest.InterestClosePnL = interest.InterestAmount * interestRatio;
            }
            if (add)
            {
                UpdateDbOption(interest);
            }
            return interest;
        }

        /// <summary>
        /// 按 interest_rule 取 FR007 定盘价。无浮动标的时返回 fallback；取不到抛异常。
        /// EOD 单日取率 + BuildSegmentRates 多日取率共用此方法，FR007 定盘逻辑收口到一处。
        /// </summary>
        private decimal ResolveFloatRate(swap_position position, DateTime date, decimal fallback)
        {
            if (string.IsNullOrEmpty(position.FloatRateUnderlyingCode)) return fallback;
            var fixingDate = IndexFixerBase.GetFixingDate(date, position.interest_rule);
            if (IndexFixer.TryGetFixing(fixingDate, position.FloatRateUnderlyingCode, out decimal fixing))
                return fixing != 0m ? fixing : fallback;
            throw new Exception($"获取不到{position.FloatRateUnderlyingCode}在{fixingDate:yyyy年MM月dd日}的价格");
        }

        /// <summary>
        /// 按重置周期切分利率段，每段记录 all-in 利率(spread+fixing)。返回 (分段列表, 末段浮动利率)。
        /// fetchAfterDate: 仅该日期之后的重置日才取 FR007（单利传 ValueDate，复利传 null 全程取）。
        /// </summary>
        private (List<(DateTime StartDate, decimal Rate)> Segments, decimal LastFloat) BuildSegmentRates(
            DateTime startDate, DateTime endDate, int interestPeriod,
            swap_position position, decimal spread, decimal initialFloat,
            DateTime? fetchAfterDate)
        {
            var rates = new List<(DateTime, decimal)>();
            var calcDays = (endDate - startDate).Days;
            decimal currentFloat = initialFloat;
            for (int i = 0; i <= calcDays; i += interestPeriod)
            {
                var resetDate = startDate.AddDays(i);
                if (fetchAfterDate == null || resetDate > fetchAfterDate.Value)
                    currentFloat = ResolveFloatRate(position, resetDate, currentFloat);
                rates.Add((resetDate, spread + currentFloat));
            }
            return (rates, currentFloat);
        }

        /// <summary>
        /// 计算复利 盘中
        /// </summary>
        /// <param name="lastSwapDate">上一互换日</param>
        /// <param name="endDate">结算日期</param>
        /// <param name="floatUnderylingCode">浮动标的</param>
        /// <param name="principal">计息基数</param>
        /// <param name="interestRate">固定利率</param>
        /// <param name="isAnnualized">是否年化</param>
        /// <param name="annualDays">年化天数</param>
        /// <returns></returns>
        public void CalcDailyCompoundInterest(DateTime endDate, swap_position position, decimal principal, swap_flow_event flowEvent,
            int annualDays, decimal floateRate, decimal closePercent, bool calcFirst, bool calcLast,
            ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m, decimal resetCarryInterest = 0m)
        {
            var startDate = position.PosiStartDate;
            int interestPeriod = position.interest_rest_days ?? 1;

            // 分段取率：复利全程重放，每个重置日(含 startDate)取 FR007（fetchAfterDate=null）。
            var (segmentRates, currentFloat) = BuildSegmentRates(
                startDate, endDate, interestPeriod, position, flowEvent.InterestRate, floateRate,
                fetchAfterDate: null);

            // 纯函数复利计息：分段重置日并本金 + resetCarryInterest + 扣 consumedInterest
            var interestTrace = new AccrualTrace();
            var result = CompoundInterestAccrual.AccruePeriod(
                notional: principal,
                segmentRates: segmentRates,
                startDate: startDate,
                endDate: endDate,
                boundary: AccrualBoundary.Of(calcFirst, calcLast),
                annualDays: annualDays,
                isAnnualized: position.IsAnnualized,
                resetCarryInterest: resetCarryInterest,
                realizedInterest: consumedInterest,
                unwindFraction: closePercent,
                finalBasis: out var finalBasis,
                trace: interestTrace);
            SwapCalcTrace.Write(interestTrace);

            // flowEvent 副作用：FloatRate=末段浮动利率；InterestPrincipal=复利终期本金(最后一次并本金后的基数)。
            flowEvent.FloatRate = currentFloat;
            flowEvent.InterestPrincipal = finalBasis;

            InterestAmount = result.Accrued;
            TdInterestAmount = result.AccruedToday;
        }

        /// <summary>
        /// 计算单利 盘中（按重置天数分段，每段使用对应浮动利率）
        /// </summary>
        public void CalcDailySimpleInterest(eod_swap_position preEodPosition, DateTime endDate, swap_position position, decimal posiPrincipal, swap_flow_event flowEvent, int annualDays, decimal floateRate, decimal closePercent, decimal orginPv, bool calcFirst, bool calcLast, ref decimal InterestAmount, ref decimal TdInterestAmount, decimal consumedInterest = 0m)
        {
            var startDate = position.PosiStartDate;
            int interestPeriod = position.interest_rest_days ?? 1;

            // orginPv 是路径相关参考本金（资金腿=上一日终浮动端名义本金）。保证金腿已走 CalcMarginInterest，不经此方法。
            // 单利差分：accrualBasis 全程恒定 = 昨日终滚动基数 + 当日名义本金 - 参考本金。
            var accrualBasis = preEodPosition.TdInterestPrincipal + posiPrincipal - orginPv;

            // 分段取率：仅 ValueDate 之后的重置日才取 FR007（fetchAfterDate=ValueDate）。
            var (segmentRates, currentFloat) = BuildSegmentRates(
                startDate, endDate, interestPeriod, position, flowEvent.InterestRate, floateRate,
                fetchAfterDate: preEodPosition.ValueDate);

            // 纯函数计息：Accrued=缩放累计(InterestAmount)，AccruedToday=未缩放累计(TdInterestAmount)
            var interestTrace = new AccrualTrace();
            var result = SimpleInterestAccrual.AccruePeriod(
                priorAccrued: preEodPosition.InterestProfitSum * closePercent,
                notional: accrualBasis,
                unwindFraction: closePercent,
                segmentRates: segmentRates,
                startDate: startDate,
                endDate: endDate,
                priorValueDate: preEodPosition.ValueDate,
                boundary: AccrualBoundary.Of(calcFirst, calcLast),
                annualDays: annualDays,
                isAnnualized: position.IsAnnualized,
                trace: interestTrace);
            SwapCalcTrace.Write(interestTrace);

            // flowEvent 副作用（下游 EOD 用 InterestPrincipal 播种次日 TdInterestPrincipal）
            flowEvent.InterestPrincipal = accrualBasis * closePercent;
            flowEvent.FloatRate = currentFloat;

            InterestAmount = result.Accrued;
            TdInterestAmount = result.AccruedToday;
        }

        /// <summary>
        /// 计算复利 收盘
        /// </summary>
        /// <param name="lastSwapDate">上一互换日</param>
        /// <param name="endDate">结算日期</param>
        /// <param name="tradeDate">开仓日</param>
        /// <param name="floatUnderylingCode">浮动标的</param>
        /// <param name="principal">计息基数</param>
        /// <param name="interestRate">固定利率</param>
        /// <param name="isAnnualized">是否年化</param>
        /// <param name="annualDays">年化天数</param>
        /// <returns></returns>
        public void CalcDailyCompoundInterestByEod(eod_swap_position preEodPosition, DateTime endDate, DateTime tradeDate, swap_position position, decimal principal, decimal posiPrincipal, swap_flow_event flowEvent, int annualDays, decimal floateRate, decimal closePercent, ref decimal InterestAmount, ref decimal TdInterestAmount)
        {
            int interestPeriod = position.interest_rest_days ?? 1;
            var isResetDay = (endDate - tradeDate).Days % interestPeriod == 0;

            // 重置日按 interest_rule 重新定盘浮动利率（GLMS-JIATT-20260805 根因——
            // 重置日=平仓日必须用新利率，否则沿用旧周期利率并污染后续 EOD）。非重置日沿用 floateRate。
            var effectiveFloat = isResetDay ? ResolveFloatRate(position, endDate, floateRate) : floateRate;
            flowEvent.FloatRate = effectiveFloat;

            // remainingFraction：重置日把上一日终待实现利息按本次平仓基数分摊（EOD 全量为 1）。
            var remainingFraction = posiPrincipal > 0m
                ? Math.Max(0m, Math.Min(1m, principal / posiPrincipal))
                : 1m;

            // 纯数学下沉至 CompoundInterestAccrual.AccrueEod（DDD 命名 + 末位生产精度 12 舍入）。
            var legRate = FundingLegRate.Build(position, flowEvent.InterestRate, effectiveFloat);
            var accrualPolicy = AccrualPolicy.BuildEod(position, annualDays, isCompound: true);

            // 完整计息 trace：前后日期/基数/利率/重置标志全过程，经 SwapCalcTrace 常驻落盘（关键路径日志）。
            var interestTrace = new AccrualTrace();
            var result = CompoundInterestAccrual.AccrueEod(
                priorAccrued: preEodPosition.InterestProfitSum,
                priorNotional: preEodPosition.TdInterestPrincipal,
                notional: posiPrincipal,
                unwindFraction: closePercent,
                rate: legRate,
                policy: accrualPolicy,
                isResetDay: isResetDay,
                remainingFraction: remainingFraction,
                eodDate: endDate,
                trace: interestTrace);
            SwapCalcTrace.Write(interestTrace);

            // flowEvent.InterestPrincipal：当日计息基数(已按平仓比例缩放)——下游 EOD 用它播种次日 TdInterestPrincipal。
            // 复用 CompoundEodBasis 单一真相源（与 CompoundInterestAccrual.AccrueEod 内部同一公式，见其 EodBasis 调用）。
            flowEvent.InterestPrincipal = CompoundInterestAccrual.EodBasis(
                isResetDay, posiPrincipal, preEodPosition.InterestProfitSum, remainingFraction,
                preEodPosition.TdInterestPrincipal) * closePercent;

            InterestAmount = result.Accrued;
            TdInterestAmount = result.AccruedToday;
        }

        /// <summary>
        /// 计算单利 收盘（按重置天数分段，每段使用对应浮动利率）
        /// </summary>
        public void CalcDailySimpleInterestByEod(eod_swap_position preEodPosition, DateTime endDate, DateTime tradeDate, swap_position position, decimal principal, decimal posiPrincipal, swap_flow_event flowEvent, int annualDays, decimal floateRate, decimal closePercent, ref decimal InterestAmount, ref decimal TdInterestAmount)
        {
            // 首次操作（preEod.id == 0）：计息基数按存量本金初始化——保留旧行为（含对 preEod 的就地修正）。
            if (preEodPosition.id == 0)
            {
                preEodPosition.TdInterestPrincipal = posiPrincipal;
            }

            // 取率：重置日按 interest_rule 重新定盘浮动利率（GLMS-JIATT-20260805 根因——
            // 重置日=平仓日必须用新利率，否则沿用旧周期利率并污染后续 EOD）。
            int interestPeriod = position.interest_rest_days ?? 1;
            var isResetDay = (endDate - tradeDate).Days % interestPeriod == 0;
            var effectiveFloat = isResetDay ? ResolveFloatRate(position, endDate, floateRate) : floateRate;

            flowEvent.FloatRate = effectiveFloat;

            // 纯数学下沉至 SimpleInterestAccrual（末位生产精度 12 舍入）。
            var legRate = FundingLegRate.Build(position, flowEvent.InterestRate, effectiveFloat);
            var accrualPolicy = AccrualPolicy.BuildEod(position, annualDays, isCompound: false);
            // 完整计息 trace：收集器由适配器创建，随后经 SwapCalcTrace 常驻落盘（关键路径日志，无条件）。
            var interestTrace = new AccrualTrace();
            var result = SimpleInterestAccrual.AccrueEod(
                priorAccrued: preEodPosition.InterestProfitSum,
                priorNotional: preEodPosition.TdInterestPrincipal,
                unwindFraction: closePercent,
                rate: legRate,
                policy: accrualPolicy,
                eodDate: endDate,
                trace: interestTrace);
            InterestAmount = result.Accrued;
            TdInterestAmount = result.AccruedToday;
            SwapCalcTrace.Write(interestTrace);
        }

        /// <summary>
        /// 单标的平仓
        /// </summary>
        /// <param name="unwindData"></param>
        /// <exception cref="ServiceException"></exception>
        public void SwapUnwind(UnwindData unwindData)
        {
            var td = FindTrade(unwindData.SwapTradeId);
            if (td == null)
            {
                throw new ServiceException("未找到交易信息");
            }
            UnwindNormalizer.NormalizeEventUnwindDate(unwindData);
            UnwindNormalizer.NormalizeNotionalValues(unwindData);
            NormalizeManualSettlementAmounts(unwindData, (int)SwapEventTypeEnum.平仓, "系统操作_平仓");
            //CheckLastEod(unwindData.ValueDate, td.StartDate.Value, unwindData.SwapTradeId); //去掉平仓收盘限制
            // 前端按"占期初(original)"语义传 ClosePercent(A)；后端全链路按"占剩余(remaining)"语义(B)消费。
            // 入口统一转换为 B，落库展示用的 A 由 SaveSwapDealInternal 还原。
            unwindData.ClosePercent = ToRemainingClosePercent(unwindData.ClosePercent, unwindData.NotionalValue, unwindData.PosiNotionalValue);
            if (UnwindNormalizer.NormalizeFullCloseRequest(unwindData))
            {
                UnwindNormalizer.RecalculateNormalizedUnwindAmounts(unwindData);
            }
            ValidateFrontendPnL(unwindData, isIncome: false); // 只读校验告警，不阻断交易
            bool cofirm = false;
            ExecuteInTransaction(() =>
            {
                int clientCashId = AddClientCash(td, Convert.ToDouble(-unwindData.SwapRealizedPnL), ClientCashInCashOut.系统操作_平仓费, unwindData.ValueDate);
                RecordMarginCashFlow(td, unwindData.ValueDate, unwindData.SwapMarginAmount, 0m, AddClientCash);
                DealFloatPosition(unwindData);
                var flowList = new List<swap_flow_event>(unwindData.FlowEvents);
                var eventId = SaveSwapDeal(unwindData, (int)SwapEventTypeEnum.平仓, clientCashId, "系统操作_平仓");
                var remainingStockEqvNotional = Math.Round(td.StockEqvNotional - Convert.ToDouble(unwindData.CloseNotionalValue), ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                var remainingTradeAmount = td.TradeAmount - Convert.ToDouble(unwindData.CloseQty);
                var isFullClose = UnwindNormalizer.IsFullCloseAfterDeduction(unwindData, remainingStockEqvNotional, remainingTradeAmount);
                if (isFullClose)
                {
                    td.TradeStatus = "已平仓";
                    td.StockEqvNotional = 0;
                    td.TradeAmount = 0;
                    CallSaveSwapTradeClientCash(td, unwindData.ValueDate);
                }
                else
                {
                    td.HasPartialUnWind = 1;
                    td.StockEqvNotional = remainingStockEqvNotional;
                    td.TradeAmount = remainingTradeAmount;
                }
                td.Notional = td.TradeAmount;
                td.UnWindDate = unwindData.UnwindDate;
                SaveAllChanges();
                cofirm = true;
            });
            if (cofirm)
            {
                TriggerRealtimeSwapPosition();
            }
        }
        /// <summary>
        /// 自动全平仓
        /// </summary>
        /// <param name="td"></param>
        /// <param name="unwindPrice"></param>
        /// <param name="unwindPriceFee"></param>
        public void AuotoSwapUnwind(int tradeid, decimal unwindPrice, decimal unwindPriceFee, decimal unwindNetFee, decimal unwindNet, DateTime valueDate, decimal unwindQty, decimal closeFee)
        {
            unwindPriceFee = decimal.Parse(unwindPriceFee.ToString("F10"));
            var td = DbContext.trade.Find(tradeid);
            var positions = DbContext.swap_position.ActiveByTrade(td.id);
            List<int> eventTypes = new List<int>() { (int)SwapEventTypeEnum.平仓, (int)SwapEventTypeEnum.互换 };
            var dealDate = valueDate;
            var tradeExtend = DbContext.trade_extend.FirstOrDefault(x => x.TradeId == td.id);
            td.trade_extend = tradeExtend;
            var position = positions.Where(x => !string.IsNullOrEmpty(x.UnderlyingCode) && !x.IsInitial).FirstOrDefault();
            var storagePriceRound = ConsGlobal.InstrumentType.IsBond(position?.UnderlyingInstrumentType)
                ? ConsGlobal.PriceRound
                : ConsGlobal.SwapDeliveryPriceRound;
            unwindPrice = Math.Round(unwindPrice, storagePriceRound, MidpointRounding.AwayFromZero);
            var preDealDate = GetPreDealDate(td.id, dealDate, eventTypes);
            swap_flow_event floatEvent = new swap_flow_event();
            UnwindData unwindData = new UnwindData();
            unwindData.CloseType = 2;
            unwindData.StartDate = td.TradeDate.Value;
            if (preDealDate.HasValue)
            {
                unwindData.StartDate = preDealDate.Value;
            }
            unwindData.ValueDate = dealDate;
            unwindData.UnwindDate = QdpCalendarHelper.GetNonHoliday(dealDate.AddDays(1));
            floatEvent.EventDate = dealDate;
            floatEvent.UnwindDate = unwindData.UnwindDate;
            floatEvent.PayDate = QdpCalendarHelper.GetNonHoliday(unwindData.UnwindDate.Value.AddDays(td.trade_extend.ExtendObj.SettlementRules));
            unwindData.PayDate = floatEvent.PayDate;
            floatEvent.SwapTradeId = td.id;
            floatEvent.SwapTradeNo = td.TradeNumber;
            unwindData.SwapTradeId = td.id;
            unwindData.StructureType = td.StructureType;
            unwindData.NotionalValue = Convert.ToDecimal(td.OriginalStockEqvNotional ?? 0);
            unwindData.NotionalQty = positions.Where(x => x.IsInitial).Sum(s => s.PosiQuantity);
            unwindData.PosiNotionalValue = position != null ? position.PosiNotionalValue : Convert.ToDecimal(td.StockEqvNotional);
            unwindData.PositionQty = Convert.ToDecimal(td.TradeAmount);
            var unwindPercent = unwindData.PositionQty == 0 ? 0 : unwindQty / unwindData.PositionQty;
            unwindData.AnnualDays = tradeExtend == null ? 365 : tradeExtend.ExtendObj.AnnualDays;
            unwindData.CloseMethod = unwindQty == unwindData.PositionQty ? (int)CloseMethodEnum.全部平仓 : (int)CloseMethodEnum.部分平仓;
            unwindData.ClosePercent = unwindData.PositionQty == 0 ? 0 : unwindPercent;
            unwindData.CloseNotionalValue = position == null ? 0 : unwindQty * position.PosiGrossPrice * position.ContractSize;
            unwindData.CloseNotionalValue = unwindPercent >= 1 ? unwindData.PosiNotionalValue : Math.Round(unwindData.CloseNotionalValue, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
            unwindData.CloseQty = unwindQty;
            if (position != null)
            {
                decimal floatRatio = position.PosiDirection == 1 ? 1m : -1m;
                decimal longRatio = position.PositionType == 1 ? 1m : -1m;
                floatEvent.PositionId = position.PositionId;
                floatEvent.EventType = (int)SwapFlowEventTypeEnum.平仓;
                floatEvent.EventReason = "交易";
                floatEvent.DividendIn = 0;
                floatEvent.UnderlyingCode = position.UnderlyingCode;
                floatEvent.UnderlyingInstrumentType = position.UnderlyingInstrumentType;
                floatEvent.CloseFee = 0;
                floatEvent.BeforeCloseFee = position.PosiTradingFee + position.PosiTradingFeePending;
                floatEvent.PayDirection = position.PosiDirection;
                floatEvent.PosiGrossPrice = position.PosiGrossPrice;
                floatEvent.PosiNetPrice = position.PosiNetPrice;
                floatEvent.PositionType = position.PositionType;
                floatEvent.Quantity = unwindData.CloseQty;
                floatEvent.PositionQty = unwindData.PositionQty - unwindData.CloseQty;
                floatEvent.ContractSize = position.ContractSize;
                floatEvent.DataState = (int)SwapFlowDateStateEnum.完成;
                floatEvent.InterestMode = position.InterestMode;
                floatEvent.TradingAmountAvg = unwindPrice;
                floatEvent.TradingAmountFeeAvg = unwindPriceFee;
                floatEvent.TradingAmountNetFeeAvg = unwindNetFee;
                floatEvent.TradingAmountNetAvg = unwindNet;
                floatEvent.TradingFeePending = position.PosiTradingFeePending * unwindData.ClosePercent;
                floatEvent.TradingFeePending = Math.Round(floatEvent.TradingFeePending, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                floatEvent.TradingFee = closeFee;
                floatEvent.MarkClosePnl = (unwindPrice - position.PosiGrossPrice) * unwindQty * floatRatio * longRatio;
                //MarkClosePnl 纯盯市不要计算交易费用和分红
                floatEvent.MarkClosePnl = Math.Round(floatEvent.MarkClosePnl, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                floatEvent.TradingAmount = unwindPrice * floatEvent.Quantity * floatEvent.ContractSize;
                floatEvent.TradingAmount = Math.Round(floatEvent.TradingAmount, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                floatEvent.OptLog = "流水自动";
                floatEvent.ClientId = td.ClientId;
                floatEvent.SetOpt(UserInfo);
                EnrichDividendIn(floatEvent, unwindQty, td);
            }
            unwindData.FlowEvents.Add(floatEvent);
            var interestPositions = GetUnwindInterests(unwindData.ValueDate, unwindData.UnwindDate.Value, td.id, unwindPercent, (int)SwapEventTypeEnum.平仓);
            interestPositions.ForEach(item =>
            {
                item.OptLog = "流水自动";
            });
            foreach (var item in interestPositions)
            {
                item.TdInterestAmount = Math.Round(item.TdInterestAmount, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                item.InterestAmount = Math.Round(item.InterestAmount, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                item.InterestClosePnL = Math.Round(item.InterestClosePnL, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
            }
            unwindData.FlowEvents.AddRange(interestPositions);
            CalcCloseAmount(unwindData);
            DealUnwind(unwindData, td);
        }

        private void EnrichDividendIn(swap_flow_event flowEvent, decimal unwindQty, trade td)
        {
            if (flowEvent.UnwindDate == null)
            {
                throw new ArgumentNullException("平仓日期缺失");
            }
            var date = flowEvent.EventDate;
            BondPaymentService servie = new BondPaymentService(UserInfo);
            var payments = servie.GetBondPayments(flowEvent.UnderlyingCode, td.StartDate.Value, date);

            int shortRatio = DirectionRatio.LongShort(flowEvent.PositionType);
            int directionRatio = DirectionRatio.ReceivePay(flowEvent.PayDirection);
            // + 付息日>上日日终且小于等于平仓日期的分红数据
            var dividendIn = servie.CalcPayment(payments, unwindQty, shortRatio, directionRatio);
            var um = DataCacheProvider.GetUnderlyingDataSource().GetData(flowEvent.UnderlyingCode);
            decimal tax = um.ValueAddedTax ?? 0;
            dividendIn = DividendCalc.AfterTaxRaw(dividendIn, tax);

            flowEvent.DividendIn = Math.Round(dividendIn, 2, MidpointRounding.AwayFromZero);
        }

        public decimal GetUnderlyingTax(string code)
        {
            var data = DataCacheProvider.GetUnderlyingDataSource().GetData(code);
            if (data == null)
            {
                return 0;
            }
            return data.ValueAddedTax ?? 0;
        }

        private void DealUnwind(UnwindData unwindData, trade td, string actionMsg = "系统操作_自动平仓")
        {
            int clientCashId = AddClientCashInCashOut(td, Convert.ToDouble(-unwindData.SwapRealizedPnL), ClientCashInCashOut.系统操作_平仓费, unwindData.ValueDate);
            RecordMarginCashFlow(td, unwindData.ValueDate, unwindData.SwapMarginAmount, 0m, AddClientCashInCashOut);
            var flowList = new List<swap_flow_event>(unwindData.FlowEvents);
            var eventId = SaveSwapDeal(unwindData, (int)SwapEventTypeEnum.平仓, clientCashId, actionMsg);
            if (unwindData.CloseMethod == (int)CloseMethodEnum.全部平仓)
            {
                td.TradeStatus = "已平仓";
                td.trade_extend = DbContext.trade_extend.FirstOrDefault(x => x.TradeId == td.id);
                if (td.trade_extend != null && !td.trade_extend.ExtendObj.NeedOpenFee)
                {
                    new ClientCashInCashOutService(this).SaveSwapTradeClientCash(td, td.TradePrice ?? 0, unwindData.ValueDate, 0);
                }
            }
            else
            {
                td.HasPartialUnWind = 1;
            }
            td.UnWindDate = unwindData.UnwindDate;
            td.StockEqvNotional = Math.Round(td.StockEqvNotional - Convert.ToDouble(unwindData.CloseNotionalValue), ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
            td.TradeAmount -= Convert.ToDouble(unwindData.CloseQty);
            td.Notional = td.TradeAmount;
            td.OptDate = DateTime.Now;
            td.OptId = UserId;
            td.OptName = UserName;
            DbContext.SaveChanges();
        }
        /// <summary>
        /// 计算平仓总额
        /// </summary>
        /// <param name="unwindData"></param>
        private void CalcCloseAmount(UnwindData unwindData)
        {
            var floatPosition = unwindData.FlowEvents.FirstOrDefault(x => !string.IsNullOrEmpty(x.UnderlyingCode));
            var interestList = unwindData.FlowEvents.Where(x => string.IsNullOrEmpty(x.UnderlyingCode));
            decimal floatRatio = floatPosition.PayDirection == 1 ? 1m : -1m;
            var pnl = floatPosition.FloatPnlSum;
            unwindData.SwapCloseAmount = pnl;
            unwindData.SwapRealizedPnL = pnl;
            unwindData.SwapMarginRebatePnl = 0;
            unwindData.SwapMarginAmount = 0;
            if (interestList != null)
            {
                MarginCalc.AccumulateSettlement(interestList.ToList(), unwindData);
                interestList.ForEach(x =>
                {
                    unwindData.SwapRealizedPnL += x.InterestClosePnL;
                    unwindData.SwapCloseAmount += x.InterestClosePnL;
                });
            }
            unwindData.SwapCloseAmount = Math.Round(unwindData.SwapCloseAmount, 2, MidpointRounding.AwayFromZero);
            unwindData.SwapRealizedPnL = Math.Round(unwindData.SwapRealizedPnL, 2, MidpointRounding.AwayFromZero);
        }
        /// <summary>
        /// 互换
        /// </summary>
        /// <param name="swap_Deal"></param>
        /// <exception cref="ServiceException"></exception>
        public void SwapIncome(UnwindData unwindData)
        {
            var td = FindTrade(unwindData.SwapTradeId);
            if (td == null)
            {
                throw new ServiceException("未找到交易信息");
            }
            UnwindNormalizer.NormalizeEventUnwindDate(unwindData);
            ValidateIncomeValueDate(unwindData, td);
            NormalizeManualSettlementAmounts(unwindData, (int)SwapEventTypeEnum.互换, "系统操作_互换");
            //CheckLastEod(unwindData.ValueDate, td.StartDate.Value, unwindData.SwapTradeId); //去掉平仓收盘限制
            ValidateFrontendPnL(unwindData, isIncome: true); // 只读校验告警，不阻断交易
            ExecuteInTransaction(() =>
            {
                int clientCashId = AddClientCash(td, Convert.ToDouble(-unwindData.SwapRealizedPnL), ClientCashInCashOut.系统操作_互换, unwindData.ValueDate);
                RecordMarginCashFlow(td, unwindData.ValueDate, 0m, unwindData.SwapMarginRebatePnl, AddClientCash);
                foreach (var item in unwindData.FlowEvents)
                {
                    item.OptLog = "手工操作";
                }
                SaveSwapDeal(unwindData, (int)SwapEventTypeEnum.互换, clientCashId, "系统操作_互换");
                if (td.ExerciseDate <= unwindData.ValueDate)
                {
                    td.Notional = 0;
                    td.StockEqvNotional = 0;
                    td.TradeStatus = "已到期";
                }
                td.UnWindDate = unwindData.UnwindDate;
                SaveAllChanges();
            });
        }
        /// <summary>
        /// 互换/平仓审核通过
        /// </summary>
        /// <param name="td"></param>
        /// <param name="eventType"></param>
        /// <exception cref="Exception"></exception>
        public void ApproveSwapTrade(trade td, int eventType)
        {
            var swapEvent = FindSwapEvent(td.id, eventType);
            if (swapEvent == null)
            {
                throw new Exception("该笔交易状态为平仓待复核，未找到相关记录，请检查该笔交易是否有效");
            }
            swapEvent.unwindData = JsonConvert.DeserializeObject<UnwindData>(swapEvent.EventData);
            UnwindNormalizer.NormalizeEventUnwindDate(swapEvent.unwindData);
            UnwindNormalizer.NormalizeNotionalValues(swapEvent.unwindData);
            // Stored events keep display ratio A; approval calculations consume remaining ratio B.
            swapEvent.unwindData.ClosePercent = ToRemainingClosePercent(
                swapEvent.unwindData.ClosePercent,
                swapEvent.unwindData.NotionalValue,
                swapEvent.unwindData.PosiNotionalValue);
            var flowList = FindFlowEventsByEventId(swapEvent.id);
            foreach (var item in flowList)
            {
                item.EventDate = swapEvent.unwindData.ValueDate;
                item.UnwindDate = swapEvent.unwindData.UnwindDate;
            }
            swapEvent.unwindData.FlowEvents = flowList;
            if (eventType == (int)SwapEventTypeEnum.平仓)
            {
                if (UnwindNormalizer.NormalizeFullCloseRequest(swapEvent.unwindData))
                {
                    UnwindNormalizer.RecalculateNormalizedUnwindAmounts(swapEvent.unwindData);
                }
            }
            if (eventType == (int)SwapEventTypeEnum.互换)
            {
                ValidateIncomeValueDate(swapEvent.unwindData, td);
            }
            if (eventType == (int)SwapEventTypeEnum.平仓)
            {
                foreach (var item in flowList.Where(x => x.PositionType > 0))
                {
                    item.Quantity = swapEvent.unwindData.CloseQty;
                    item.PositionQty = swapEvent.unwindData.ClosePercent == 1
                        ? 0
                        : swapEvent.unwindData.PositionQty - swapEvent.unwindData.CloseQty;
                }
            }
            string action = eventType == (int)SwapEventTypeEnum.互换 ? ClientCashInCashOut.系统操作_互换 : ClientCashInCashOut.系统操作_平仓费;
            int clientCashId = AddClientCash(td, Convert.ToDouble(-swapEvent.unwindData.SwapRealizedPnL), action, swapEvent.unwindData.ValueDate);
            if (eventType == (int)SwapEventTypeEnum.平仓)
            {
                RecordMarginCashFlow(td, swapEvent.unwindData.ValueDate, swapEvent.unwindData.SwapMarginAmount, 0m, AddClientCash);
            }
            swapEvent.ClientCashId = clientCashId;
            td.UnWindDate = swapEvent.unwindData.UnwindDate;
            if (eventType != (int)SwapEventTypeEnum.互换)
            {
                var remainingStockEqvNotional = Math.Round(td.StockEqvNotional - Convert.ToDouble(swapEvent.unwindData.CloseNotionalValue), ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);
                var remainingTradeAmount = td.TradeAmount - Convert.ToDouble(swapEvent.unwindData.CloseQty);
                var isFullClose = UnwindNormalizer.IsFullCloseAfterDeduction(swapEvent.unwindData, remainingStockEqvNotional, remainingTradeAmount);
                if (isFullClose)
                {
                    td.TradeStatus = "已平仓";
                    td.StockEqvNotional = 0;
                    td.TradeAmount = 0;
                    CallSaveSwapTradeClientCash(td, swapEvent.unwindData.ValueDate);
                }
                else
                {
                    td.TradeStatus = ConsTrade.确认成交;
                    td.HasPartialUnWind = 1;
                    td.StockEqvNotional = remainingStockEqvNotional;
                    td.TradeAmount = remainingTradeAmount;
                }
            }
            else if (swapEvent.unwindData.CloseMethod == (int)CloseMethodEnum.全部平仓)
            {
                td.TradeStatus = "已平仓";
                CallSaveSwapTradeClientCash(td, swapEvent.unwindData.ValueDate);
            }
            else
            {
                td.TradeStatus = ConsTrade.确认成交;
                td.HasPartialUnWind = 1;
            }

            td.Notional = td.TradeAmount;
            UpdateInitalPosition(flowList, swapEvent.unwindData, eventType);
            SaveAllChanges();

        }
        /// <summary>
        /// 互换/平仓提交审核
        /// </summary>
        /// <param name="unwindData"></param>
        /// <param name="eventType"></param>
        /// <exception cref="ServiceException"></exception>
        public void ApplySwapTrade(UnwindData unwindData, int eventType)
        {
            var td = FindTrade(unwindData.SwapTradeId);
            if (td == null)
            {
                throw new ServiceException("未找到交易信息");
            }
            UnwindNormalizer.NormalizeEventUnwindDate(unwindData);
            if (eventType == (int)SwapEventTypeEnum.互换)
            {
                ValidateIncomeValueDate(unwindData, td);
            }
            unwindData.SwapRealizedPnL = unwindData.SwapCloseAmount;
            NormalizeManualSettlementAmounts(unwindData, eventType, eventType == (int)SwapEventTypeEnum.互换 ? "系统操作_互换" : "系统操作_平仓");
            // 前端按"占期初(original)"语义传 ClosePercent(A)；后端全链路按"占剩余(remaining)"语义(B)消费。
            // 入口统一转换为 B，落库展示用的 A 由 SaveSwapDealInternal 还原。
            // 与 SwapUnwind(L1270) 保持一致——缺少此转换会导致 SaveSwapDealInternal 的 B→A 还原出错
            // （例如第二次部分平仓 50%(A) → 错误还原为 0.325 而非 0.50）。
            unwindData.ClosePercent = ToRemainingClosePercent(unwindData.ClosePercent, unwindData.NotionalValue, unwindData.PosiNotionalValue);
            if (eventType == (int)SwapEventTypeEnum.平仓)
            {
                if (UnwindNormalizer.NormalizeFullCloseRequest(unwindData))
                {
                    UnwindNormalizer.RecalculateNormalizedUnwindAmounts(unwindData);
                }
            }
            string action = eventType == (int)SwapEventTypeEnum.互换 ? ClientCashInCashOut.系统操作_互换 : ClientCashInCashOut.系统操作_平仓费;
            ExecuteInTransaction(() =>
            {
                CloseReCheckSetTrade(unwindData.SwapTradeId, eventType == (int)SwapEventTypeEnum.互换, true);
                SaveSwapDeal(unwindData, eventType, 0, action, true);
                SaveAllChanges();
                // 需求①：若触发条件判定无需审批（CloseReCheck_SetTrade 已将 ProcessOrderId 设为审批通过），
                // 在 swap_event 记录创建完成后再执行审批通过流程。
                td = FindTrade(unwindData.SwapTradeId);
                if (td.ProcessOrderId == ProcessTradeLog.审批通过)
                {
                    new TradeOpenService(this).UpdateTradeProcessLog(new TradeOpenReqModel
                    {
                        tradeId = td.id,
                        status = "pass",
                        comments = "触发条件未满足，自动跳过审批",
                        notNeedOperationHistory = false
                    });
                }
            });
        }
        private void ValidateIncomeValueDate(UnwindData unwindData, trade td)
        {
            var maxIncomeValueDate = GetMaxIncomeValueDate(td).Date;
            if (unwindData.ValueDate.Date > maxIncomeValueDate)
            {
                throw new ServiceException($"手动互换结算日期不能晚于当前交易结束日期T-1：{maxIncomeValueDate:yyyy-MM-dd}");
            }
        }

        /// <summary>
        /// 保存平仓/互换事件
        /// </summary>
        /// <param name="swap_Deal"></param>
        /// <param name="eventType"></param>
        private long SaveSwapDealInternal(UnwindData unwindData, int eventType, int clientCashId, string eventResason = "", bool approve = false)
        {
            var td = DbContext.trade.Find(unwindData.SwapTradeId);
            if (td == null)
            {
                throw new ServiceException("未找到交易信息");
            }
            var flowList = new List<swap_flow_event>(unwindData.FlowEvents);
            UnwindNormalizer.NormalizeSettledInterestAmounts(flowList, eventType, eventResason);
            unwindData.FlowEvents.Clear();
            // 落库展示用"占期初(original)"语义(A)；计算链（费用递减/全平判定）用"占剩余(remaining)"语义(B)。
            // 序列化前把 ClosePercent 还原为 A，序列化后立即还原回 B 供后续使用。
            var storedClosePercent = ToOriginalClosePercent(unwindData.ClosePercent, unwindData.NotionalValue, unwindData.PosiNotionalValue);
            var incomingClosePercent = unwindData.ClosePercent;
            unwindData.ClosePercent = storedClosePercent;
            string data = JsonConvert.SerializeObject(unwindData);
            unwindData.ClosePercent = incomingClosePercent;
            var swapEvent = new SwapEventService(this).AddSwapEventDate(unwindData.ValueDate, unwindData.SwapTradeId, eventType, data, clientCashId, true, eventResason);//将平仓、互换总额存入事件
            foreach (var item in flowList)
            {
                if (item.PositionType > 0 && eventType == (int)SwapEventTypeEnum.平仓)
                {
                    item.Quantity = unwindData.CloseQty;
                    item.PositionQty = unwindData.ClosePercent == 1 ? 0 : unwindData.PositionQty - unwindData.CloseQty;
                }
                item.PayDate = unwindData.PayDate;
                item.UnwindDate = unwindData.UnwindDate;
                item.EventDate = unwindData.ValueDate;
                FillSwapFlowEvent(item, unwindData, td, eventType, swapEvent.id);
                DbContext.swap_flow_event.Add(item);
            }
            if (!approve)
            {
                UpdateInitalPosition(flowList, unwindData, eventType);
            }
            DbContext.SaveChanges();
            var savedFlowEvents = DbContext.swap_flow_event.Where(x => x.EventId == swapEvent.id).ToList();
            foreach (var item in savedFlowEvents)
            {
                FillSwapFlowEvent(item, unwindData, td, eventType, swapEvent.id);
            }
            DbContext.SaveChanges();
            return swapEvent.id;
        }

        private void FillSwapFlowEvent(swap_flow_event item, UnwindData unwindData, trade td, int eventType, long eventId)
        {
            item.EventId = eventId;
            item.SwapTradeId = unwindData.SwapTradeId;
            item.SwapTradeNo = td.TradeNumber;
            item.EventType = eventType;
            item.EventReason = string.IsNullOrWhiteSpace(item.EventReason) ? "交易" : item.EventReason;
            UpdateDbOption(item);
        }

        /// <summary>
        /// 计算平仓数据
        /// </summary>
        /// <param name="unwindData"></param>
        private void DealFloatPosition(UnwindData unwindData)
        {
            foreach (var item in unwindData.FlowEvents)
            {
                item.OptLog = "手工操作";
                if (item.PositionType > 0 && item.EventType == (int)SwapEventTypeEnum.平仓)
                {
                    decimal shortRatio = item.PositionType == (int)PositionTypeFlag.Long ? -1m : 1m;
                    item.TradingAmountFeeAvg = item.TradingAmountAvg + item.TradingFeePending / unwindData.CloseQty * shortRatio;
                    item.TradingAmountNetFeeAvg = item.TradingAmountNetAvg + item.TradingFeePending / unwindData.CloseQty * shortRatio;
                    item.TradingAmount = item.TradingAmountAvg * unwindData.CloseQty;
                }
            }
        }
        /// <summary>
        /// 单标的互换更新实时持仓信息
        /// </summary>
        /// <param name="swap_Deal"></param>
        private void UpdateInitalPosition(List<swap_flow_event> flowList, UnwindData unwindData, int eventType)
        {
            var positions = DbContext.swap_position.Where(x => !x.IsInitial && x.SwapTradeId == unwindData.SwapTradeId && !x.Invalid);
            foreach (var position in positions)
            {
                if (!string.IsNullOrEmpty(position.UnderlyingCode))
                {
                    // 收益结算（互换）不改变持仓数量和名义本金，只更新费用
                    if (eventType == (int)SwapEventTypeEnum.互换)
                    {
                        position.PosiTradingFee -= position.PosiTradingFee * unwindData.ClosePercent;
                        position.PosiTradingFeePending -= position.PosiTradingFeePending * unwindData.ClosePercent;
                    }
                    else
                    {
                        // 平仓时才扣减持仓
                        var remainingPositionQty = position.PosiQuantity - unwindData.CloseQty;
                        var remainingPositionNotional = Math.Round(
                            position.PosiNotionalValue - unwindData.CloseNotionalValue,
                            ConsGlobal.MoneyRound,
                            MidpointRounding.AwayFromZero);
                        position.PosiQuantity = unwindData.ClosePercent == 1
                            ? 0
                            : remainingPositionQty;
                        position.PosiNotionalValue = unwindData.ClosePercent == 1
                            ? 0
                            : remainingPositionNotional;
                        position.PosiTradingFee -= position.PosiTradingFee * unwindData.ClosePercent;
                        position.PosiTradingFeePending -= position.PosiTradingFeePending * unwindData.ClosePercent;
                    }
                }
                else
                {
                    var interest = flowList.FirstOrDefault(x => x.PositionId == position.PositionId);
                    if (interest != null)
                    {
                        position.InterestAmount += interest.InterestAmount;
                        position.InterestFeePending += interest.InterestFee;
                        if (MarginModes.Contains(interest.InterestMode) && eventType == (int)SwapEventTypeEnum.平仓)
                        {
                            var remainingInterestPrincipal = Math.Round(
                                position.InterestPrincipalFix - interest.InterestPrincipal,
                                ConsGlobal.MoneyRound,
                                MidpointRounding.AwayFromZero);
                            position.InterestPrincipalFix = unwindData.ClosePercent == 1
                                ? 0
                                : remainingInterestPrincipal;
                        }
                    }
                }
            }
        }

    }
}