zszq-trs/UnitTestProject/Modules/SwapModule/DealInterestsScenarioTest.cs

using Newtonsoft.Json;
using YLErp.DBModels;
using YLErp.DBModels.Enums;

namespace YLErp.Modules.SwapModule
{
    /// <summary>
    /// DealInterests 利息腿归档 - 合成单元测试（内存，不连库）
    /// ============================================================================
    /// 目标：验证收盘时利息腿 eod 的字段计算，覆盖三个分支：
    ///   ① 手动互换分支 SaveEodInterestPosition（我们修复 InterestIncomeSum 归零的核心）
    ///   ② 普通日分支 SaveEodInterestPositionCopy（InterestIncomeSum 每日递增）
    ///   ③ 多日守恒（半平后多日再全平，利息一致性）
    ///
    /// 模仿 GetInterestsUnitTest_T0 的风格：
    ///   - 继承生产类，override 虚方法替换 DB 调用
    ///   - 内存构造 trade/position/eod/flowEvent 数据
    ///   - 断言业务期望值（独立计算，非循环论证）
    /// ============================================================================
    [TestClass]
    public class DealInterestsScenarioTest
    {
        #region 测试常量

        private const decimal Principal = 1000m;
        private const decimal FixedRate = 0.01m;
        private const int AnnualDays = 365;
        private static readonly DateTime StartDate = new(2026, 4, 27);
        private static readonly DateTime ExerciseDate = new(2027, 4, 27);

        /// <summary>每天利息（固定利率，算头不算尾，年化365天）</summary>
        private static decimal DailyInterest => Math.Round(Principal * FixedRate / AnnualDays, ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);

        #endregion

        #region Stub：内存 SwapEodPositionService

        /// <summary>
        /// 测试用子类：override 虚方法，把 DB 调用替换为内存操作。
        /// - PersistEodSwapPosition：收集到列表而非写库
        /// - GetCurrencyRate：返回 1.0（本币）
        /// </summary>
        private sealed class StubEodPositionService : TestableSwapEodPositionService
        {
            /// <summary>
            /// 自动互换场景可注入固定流水，避免为了验证结算边界而依赖真实计息公式。
            /// 未赋值时仍走生产使用的真实 GetInterests 计算。
            /// </summary>
            public List<swap_flow_event> AutoInterests { get; set; }

            public SwapDealService DealService { get; set; }

            public eod_swap_position LastInterestCalculationEodPosition { get; private set; }

            public StubEodPositionService() : base(nameof(DealInterestsScenarioTest))
            {
            }

            // override CalcSwapInterests：用真实 SwapDealService 算（固定利率不需 mock 浮动利率）
            // 生产代码默认实现也是 new SwapDealService(this).GetInterests(...)，这里保持一致
            // 但 SwapDealService 内部 TryGetFloatRate 会连库——固定利率(FloatRateUnderlyingCode=null)不会触发
            protected override List<swap_flow_event> CalcSwapInterests(
                trade td, trade_extend tradeExtend,
                DateTime valueDate, DateTime unwindDate,
                List<eod_swap_position> eodPositions, List<swap_position> positions,
                decimal posiNotionalValue, decimal posiLongNotionalValue, decimal posiShortNotionalValue,
                decimal closePosiNotionalValue, decimal closePrecent,
                int eventType, bool tdClose, bool needPrice,
                decimal grossPrice, decimal orginPv,
                bool add = false, bool settment = true, bool newCalcLast = false,
                List<swap_flow_event> closeList = null)
            {
                LastInterestCalculationEodPosition = eodPositions.SingleOrDefault();
                if (AutoInterests != null)
                {
                    return AutoInterests;
                }

                return (DealService ?? new SwapDealService(this)).GetInterests(td, tradeExtend, valueDate, unwindDate,
                    eodPositions, positions, posiNotionalValue, posiLongNotionalValue, posiShortNotionalValue,
                    closePosiNotionalValue, closePrecent, eventType, tdClose, needPrice,
                    grossPrice, orginPv, add, settment, newCalcLast, closeList);
            }

            // public 包装：让测试能调用 protected 方法
            public eod_swap_position ExecuteSaveEodInterestPosition(
                eod_swap_position eodPayPosition, eod_swap_position newEodPayPosition,
                swap_position position, trade td, DateTime valueDate, List<swap_flow_event> flowEvents)
            {
                SaveEodInterestPosition(eodPayPosition, newEodPayPosition, position, td, valueDate, flowEvents);
                return PersistedPositions.LastOrDefault();
            }

            // public 包装：验证自动互换时的“高精度应结 -> 两位实际结算 -> 待实现尾差”链路。
            public eod_swap_position ExecuteSaveAutoEodInterestPosition(
                eod_swap_position eodPayPosition, swap_position position, trade td,
                DateTime valueDate, IntervalModel interval, eod_swap lastEodSwap = null,
                decimal posiLongNotional = DealInterestsScenarioTest.Principal,
                decimal orginPv = DealInterestsScenarioTest.Principal)
            {
                SaveAutoEodInterestPosition(eodPayPosition, null, position, td, valueDate, interval,
                    lastEodSwap, posiLongNotional, 0m, 1m, orginPv);
                return PersistedPositions.LastOrDefault();
            }

            public eod_swap_position ExecuteSaveAutoEodWithCloseInterestPosition(
                eod_swap_position eodPayPosition, swap_position position, trade td,
                DateTime valueDate, IntervalModel interval, decimal posiLongNotional,
                decimal posiShortNotional, List<swap_flow_event> flowEvents,
                decimal closeNotional, bool autoSwap)
            {
                SaveAutoEodWithCloseInterestPosition(eodPayPosition, null, position, td, valueDate, interval,
                    posiLongNotional, posiShortNotional, flowEvents, closeNotional, autoSwap, 1m,
                    DealInterestsScenarioTest.Principal);
                return PersistedPositions.LastOrDefault();
            }

            // public 包装：直接调用 protected virtual DealInterests（已改为 virtual，无需反射）
            public void ExecuteDealInterests(
                List<swap_position> interestList, List<eod_swap_position> eodPositions,
                DateTime settleDate, trade td, List<swap_flow_event> flowEvents,
                decimal posiLongNational, decimal posiShortNational,
                decimal closeNational, decimal grossPrice, decimal orginPv)
            {
                DealInterests(interestList, eodPositions, new List<eod_swap_position>(),
                    settleDate, td, flowEvents, new List<swap_flow_event>(), null,
                    posiLongNational, posiShortNational, closeNational, grossPrice, orginPv);
            }
        }

        private sealed class StubCompoundSwapDealService : SwapDealService
        {
            private readonly IReadOnlyDictionary<DateTime, double> _floatRates;

            public StubCompoundSwapDealService(IReadOnlyDictionary<DateTime, double> floatRates = null)
                : base(new OptUserInfo(0, nameof(StubCompoundSwapDealService), OptUserFrom.UnitTest))
            {
                _floatRates = floatRates ?? new Dictionary<DateTime, double>();
            }

            protected override bool TryGetFloatRate(DateTime valueDate, string underlyingCode, out double rate)
            {
                return _floatRates.TryGetValue(valueDate.Date, out rate);
            }

            public override decimal GetConsumedInterest(int tradeId, long positionId, DateTime beforeDate)
            {
                return 0m;
            }
        }

        #endregion

        #region 数据构建器

        private static trade CreateTrade()
        {
            return new trade
            {
                id = 1, TradeNumber = "UT-DEAL-INT-001", ClientId = 999998,
                TradeType = "收益互换", TradeDate = StartDate, StartDate = StartDate,
                ExerciseDate = ExerciseDate, TradeStatus = "确认成交", ValidState = "Valid",
                StructureType = "单标的", QuoteCurrency = "CNY", SettlementCurrency = "CNY",
                trade_extend = new trade_extend
                {
                    TradeId = 1,
                    ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
                    {
                        AnnualDays = AnnualDays,
                        InterestCalcMode = "10", // 算头不算尾
                        SettlementRules = 0
                    })
                }
            };
        }

        private static swap_position CreateInterestPosition()
        {
            return new swap_position
            {
                id = 1001, SwapTradeId = 1, PositionType = (int)PositionTypeFlag.Unknown,
                InterestDirection = (int)SwapDirectionEnum.收取, InterestMode = (int)InterestModeEnum.标的期初全价,
                InterestRateDefault = FixedRate, InterestPrincipalFix = Principal,
                PosiStartDate = StartDate, PosiMatuirityDate = ExerciseDate,
                IsInitial = true, Invalid = false, InterestType = (int)InterestTypeEnum.单利,
                IsAnnualized = true, interest_rest_days = 1, interest_rule = 0,
                FloatRateUnderlyingCode = null, // 固定利率，不需要浮动
                InterestSwapInterval = JsonConvert.SerializeObject(new List<IntervalModel>
                {
                    new IntervalModel { Date = ExerciseDate, Rate = FixedRate, Settlement = 0 }
                })
            };
        }

        /// <summary>创建前一日 eod（模拟"昨天收盘后的状态"）</summary>
        private static eod_swap_position CreatePreEod(DateTime valueDate, decimal interestProfitSum, decimal realizedInterest = 0m)
        {
            return new eod_swap_position
            {
                id = 100, SwapTradeId = 1, PositionId = 1001, ValueDate = valueDate,
                ClientId = 999998, InterestDirection = (int)SwapDirectionEnum.收取,
                InterestMode = (int)InterestModeEnum.标的期初全价,
                InterestProfitSum = interestProfitSum,
                InterestIncomeSum = interestProfitSum,
                RealizedInterest = realizedInterest,
                InterestRateDefault = FixedRate,
                TdInterestPrincipal = Principal,
                PosiNotionalValue = Principal,
                InterestType = (int)InterestTypeEnum.单利,
                IsAnnualized = true, interest_rest_days = 1,
                FloatRate = 0m
            };
        }

        /// <summary>创建互换 flow_event（模拟"当天做了收益结算"）</summary>
        private static swap_flow_event CreateSwapFlowEvent(DateTime eventDate, decimal interestAmount)
        {
            return new swap_flow_event
            {
                id = 2001, SwapTradeId = 1, EventType = (int)SwapFlowEventTypeEnum.互换,
                EventDate = eventDate, UnwindDate = eventDate, PositionId = 1001,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestAmount = interestAmount,
                InterestClosePnL = interestAmount, // 收取方向，两者相等
                InterestRate = FixedRate,
                InterestMode = (int)InterestModeEnum.标的期初全价,
                InterestPrincipal = Principal,
                FloatRate = 0m,
                DataState = (int)SwapFlowDateStateEnum.完成
            };
        }

        /// <summary>
        /// 创建自动互换利息流水。InterestAmount 是高精度应结，生产入口负责将实际结算收敛到两位。
        /// </summary>
        private static swap_flow_event CreateAutoSwapFlowEvent(DateTime eventDate, decimal interestAmount)
        {
            return new swap_flow_event
            {
                id = 2002, SwapTradeId = 1, EventType = (int)SwapFlowEventTypeEnum.自动互换,
                EventDate = eventDate, UnwindDate = eventDate, PositionId = 1001,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestAmount = interestAmount,
                TdInterestAmount = interestAmount,
                InterestClosePnL = interestAmount,
                InterestRate = FixedRate,
                InterestMode = (int)InterestModeEnum.标的期初全价,
                InterestPrincipal = Principal,
                FloatRate = 0m,
                DataState = (int)SwapFlowDateStateEnum.完成
            };
        }

        private static void AssertDecimal(decimal expected, decimal actual, string message = "")
        {
            var tolerance = 1m / (decimal)Math.Pow(10, ConsGlobal.PriceRound - 2);
            Assert.IsTrue(Math.Abs(expected - actual) <= tolerance,
                $"{message} Expected: {expected}, Actual: {actual}, Diff: {expected - actual}");
        }

        #endregion

        // ================================================================
        // 场景1：互换结清后 InterestIncomeSum 应归零（cs:837 修复验证）
        // ================================================================

        #region 场景1：互换结清后 InterestIncomeSum 归零

        /// <summary>
        /// [DI_SWAP_ZERO_001] 互换结清-攒了N天利息后全额互换结算，待实现应归零
        /// ---------------------------------------------------------------
        /// 起息日4/27，攒到5/10（13天），InterestProfitSum≈13天利息。
        /// 5/10做互换结算，flow_event.InterestAmount=13天利息。
        /// 收盘后 InterestIncomeSum 应≈0（全部已实现）。
        /// ---------------------------------------------------------------
        /// </summary>
        [TestMethod]
        public void DI_SWAP_ZERO_001_互换结清后待实现归零()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var settleDate = new DateTime(2026, 5, 10);

            // 攒了13天利息（4/27~5/9，算头不算尾）
            int days = (settleDate - StartDate).Days;
            decimal accumulatedInterest = Math.Round(Principal * FixedRate * days / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
            var preEod = CreatePreEod(settleDate.AddDays(-1), accumulatedInterest);

            // 当天做了互换结算，利息=攒的全部
            var swapEvent = CreateSwapFlowEvent(settleDate, accumulatedInterest);

            // 执行互换分支
            var result = service.ExecuteSaveEodInterestPosition(preEod, null, position, td, settleDate, new List<swap_flow_event> { swapEvent });

            // 核心断言：InterestIncomeSum = pre + 当天新计(TdInterestIncome) - 实现(TdCloseInterest)
            // 互换把攒的13天全付了(TdCloseInterest=accumulatedInterest)，但当天又产生1天新计(TdInterestIncome)
            // 所以 InterestIncomeSum 应 ≈ 1天新计利息（而非严格0）
            // 公式(cs:869): pre.InterestIncomeSum + TdInterestIncome - TdCloseInterest
            decimal expectedTdInterestIncome = Math.Round(Principal * FixedRate / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
            AssertDecimal(expectedTdInterestIncome, result.InterestIncomeSum,
                $"互换结清后 InterestIncomeSum 应=当天新计利息({expectedTdInterestIncome:F6})，" +
                $"而非攒的全程({accumulatedInterest:F6})");

            // TdCloseInterest 应=互换实现的利息
            AssertDecimal(accumulatedInterest, result.TdCloseInterest, "TdCloseInterest 应=互换实现的利息");

            // RealizedInterest 应累加（preEod.RealizedInterest + TdCloseInterest * ratio）
            // 收取方向 ratio=1
            AssertDecimal(accumulatedInterest, result.RealizedInterest, "RealizedInterest 应累加已实现利息");

            Console.WriteLine($"攒了{days}天利息={accumulatedInterest:F6}");
            Console.WriteLine($"互换结清后 InterestIncomeSum={result.InterestIncomeSum:F6}（应≈0）✅");
            Console.WriteLine($"TdCloseInterest={result.TdCloseInterest:F6} RealizedInterest={result.RealizedInterest:F6}");
        }

        /// <summary>
        /// [DI_SWAP_ZERO_002] 互换结清后 InterestIncomeSum 不为负（防多扣）
        /// ---------------------------------------------------------------
        /// 验证：待实现=0（已结清）时，TdCloseInterest=当天新计，InterestIncomeSum 应=0。
        /// 公式: 0 + 当天新计 - 当天新计 = 0。如果公式有误会变成负数。
        /// ---------------------------------------------------------------
        /// </summary>
        [TestMethod]
        public void DI_SWAP_ZERO_002_互换结清后待实现不为负()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var swapDate = new DateTime(2026, 5, 10);

            // 已结清状态：待实现=0
            var postSwapEod = CreatePreEod(swapDate.AddDays(-1), 0m, 0m);

            // 互换只结算当天新计（InterestAmount=当天新计利息）
            decimal dailyInc = Math.Round(Principal * FixedRate / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
            var swapEvent = CreateSwapFlowEvent(swapDate, dailyInc);

            var result = service.ExecuteSaveEodInterestPosition(postSwapEod, null, position, td, swapDate, new List<swap_flow_event> { swapEvent });

            // 公式: 0(待实现) + dailyInc(新计) - dailyInc(实现) = 0
            AssertDecimal(0m, result.InterestIncomeSum, "待实现=0+当天新计-当天新计应=0，不应为负");
            Console.WriteLine($"已结清后再互换(只结算当天新计)：InterestIncomeSum={result.InterestIncomeSum:F6} = 0 ✅");
        }

        #endregion

        // ================================================================
        // 场景2：DealInterests 分支选择逻辑验证
        // ================================================================

        #region 场景2：分支选择

        /// <summary>
        /// [DI_BRANCH_001] 普通日（无互换无平仓无观察日）→ 走 copy 分支
        /// ---------------------------------------------------------------
        /// flowEvents 为空，insterval=null，hasSwap=false，hasClose=false
        /// → 应走 SaveEodInterestPositionCopy（cs:338）
        /// ---------------------------------------------------------------
        /// <summary>
        /// [DI_BRANCH_001] 普通日收盘归档：InterestIncomeSum 每天递增1天利息
        /// ---------------------------------------------------------------
        /// 前日待实现=1天利息，今日收盘（无互换无平仓），应变成2天利息。
        /// 验证 copy 分支（SaveEodInterestPositionCopy）的 InterestIncomeSum 公式。
        /// ---------------------------------------------------------------
        /// </summary>
        [TestMethod]
        public void DI_BRANCH_001_普通日归档待实现递增()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var settleDate = new DateTime(2026, 4, 28); // 第2天
            var preEod = CreatePreEod(settleDate.AddDays(-1), DailyInterest); // 前日=1天利息

            // 普通日：无互换无平仓，InterestSwapInterval=null（当天非观察日）
            position.InterestSwapInterval = null;

            service.ExecuteDealInterests(
                new List<swap_position> { position },
                new List<eod_swap_position> { preEod },
                settleDate, td, new List<swap_flow_event>(),
                Principal, 0m, 0m, 1m, Principal);

            Assert.IsTrue(service.PersistedPositions.Count > 0, "应生成eod");
            var result = service.PersistedPositions[0];
            // 普通日：InterestIncomeSum 应 = 前日 + 当天新计 = 1天 + 1天 = 2天
            AssertDecimal(DailyInterest * 2, result.InterestIncomeSum,
                $"普通日后 InterestIncomeSum 应=2天利息({DailyInterest * 2:F6})");
            Console.WriteLine($"普通日归档：InterestIncomeSum={result.InterestIncomeSum:F6} = 2×{DailyInterest:F6} ✅");
        }

        /// <summary>
        /// [DI_BRANCH_002] 互换日（hasSwap=true）→ 走 SaveEodInterestPosition 分支
        /// ---------------------------------------------------------------
        /// flowEvents 含 EventType=互换，hasSwap=true
        /// → 应走 SaveEodInterestPosition（cs:330）
        /// → 验证 PersistEodSwapPosition 被调用（生成了 eod）
        /// ---------------------------------------------------------------
        /// </summary>
        [TestMethod]
        public void DI_BRANCH_002_互换日走SaveEodInterestPosition分支()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var settleDate = new DateTime(2026, 5, 10);
            var preEod = CreatePreEod(settleDate.AddDays(-1), DailyInterest * 13);

            // 互换事件
            var swapEvent = CreateSwapFlowEvent(settleDate, DailyInterest * 13);
            position.InterestSwapInterval = null;

            var interestList = new List<swap_position> { position };
            var eodPositions = new List<eod_swap_position> { preEod };

            service.ExecuteDealInterests(interestList, eodPositions, settleDate, td,
                new List<swap_flow_event> { swapEvent },
                Principal, 0m, 0m, 1m, Principal);

            // 互换分支应生成1条 eod
            Assert.AreEqual(1, service.PersistedPositions.Count, "互换分支应生成1条eod");
            var result = service.PersistedPositions[0];
            // InterestIncomeSum = pre + 当天新计 - 实现 ≈ 当天新计（攒的全付了）
            AssertDecimal(DailyInterest, result.InterestIncomeSum, "互换结清后待实现≈当天新计利息");
            Console.WriteLine($"互换日分支执行，InterestIncomeSum={result.InterestIncomeSum:F6} ≈ 当天新计({DailyInterest:F6}) ✅");
        }

        #endregion

        // ================================================================
        // 场景3：多日守恒——连续收盘归档，InterestIncomeSum 应线性递增
        // ================================================================

        #region 场景3：多日连续归档

        /// <summary>
        /// [DI_MULTI_001] 连续5天普通日收盘归档，InterestIncomeSum 每天递增1天利息
        /// ---------------------------------------------------------------
        /// 从4/27(首日)开始，连续收盘到5/1，验证 InterestIncomeSum 线性递增。
        /// 每天收盘后 InterestIncomeSum 应 = 天数 × DailyInterest。
        /// ---------------------------------------------------------------
        /// </summary>
        [TestMethod]
        public void DI_MULTI_001_连续5天归档待实现线性递增()
        {
            var td = CreateTrade();
            var position = CreateInterestPosition();
            position.InterestSwapInterval = null; // 无观察日

            decimal runningIncomeSum = 0m;
            var runningDate = StartDate;

            for (int day = 0; day < 5; day++)
            {
                var service = new StubEodPositionService();
                var preEod = CreatePreEod(runningDate.AddDays(-1), runningIncomeSum);

                service.ExecuteDealInterests(
                    new List<swap_position> { position },
                    new List<eod_swap_position> { preEod },
                    runningDate, td, new List<swap_flow_event>(),
                    Principal, 0m, 0m, 1m, Principal);

                Assert.IsTrue(service.PersistedPositions.Count > 0, $"第{day + 1}天应生成eod");
                var result = service.PersistedPositions[0];

                // 首日 InterestIncomeSum = 1天利息，后续每天+1天利息
                decimal expected = DailyInterest * (day + 1);
                AssertDecimal(expected, result.InterestIncomeSum,
                    $"第{day + 1}天 InterestIncomeSum 应={(day + 1)}天利息");

                runningIncomeSum = result.InterestIncomeSum;
                runningDate = runningDate.AddDays(1);
            }

            Console.WriteLine($"连续5天归档：InterestIncomeSum 从0递增到{runningIncomeSum:F6} = 5×{DailyInterest:F6} ✅");
        }

        // ================================================================
        // 场景4：互换→收盘→再攒→再互换 守恒验证
        // ================================================================

        #region 场景4：多次互换结算守恒

        /// <summary>
        /// [DI_SWAP_MULTI_001] 攒10天→互换结清→再攒5天→再互换结清
        /// ---------------------------------------------------------------
        /// 验证：第一次互换后 InterestIncomeSum≈当天新计（攒的10天付了），
        ///       再攒5天后 InterestIncomeSum≈6天（5天新攒+1天当天新计），
        ///       第二次互换后 InterestIncomeSum≈当天新计（攒的6天又付了）。
        ///
        /// 守恒约束：两次互换结算的 TdCloseInterest 之和 = 全程利息（15天+2天新计）。
        /// </summary>
        [TestMethod]
        public void DI_SWAP_MULTI_001_多次互换结算守恒()
        {
            var td = CreateTrade();
            var position = CreateInterestPosition();

            // --- Phase 1: 攒10天（4/27~5/6），到5/6 ---
            var date10 = StartDate.AddDays(10); // 5/7
            decimal sum10days = Math.Round(Principal * FixedRate * 10 / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);

            var preEod10 = CreatePreEod(date10.AddDays(-1), sum10days - DailyInterest); // 前日=9天
            // 当天新计让它到10天
            var svc1 = new StubEodPositionService();
            svc1.ExecuteDealInterests(new List<swap_position> { position },
                new List<eod_swap_position> { preEod10 }, date10, td,
                new List<swap_flow_event>(), Principal, 0m, 0m, 1m, Principal);
            var eod10days = svc1.PersistedPositions[0];
            AssertDecimal(sum10days, eod10days.InterestIncomeSum, "10天后待实现应=10天利息");
            Console.WriteLine($"Phase1: 攒10天 InterestIncomeSum={eod10days.InterestIncomeSum:F6}");

            // --- Phase 2: 5/7 互换结清 ---
            var swapDate1 = date10; // 同天互换
            var svc2 = new StubEodPositionService();
            var swapEvt1 = CreateSwapFlowEvent(swapDate1, sum10days);
            var swapResult1 = svc2.ExecuteSaveEodInterestPosition(
                eod10days, null, position, td, swapDate1, new List<swap_flow_event> { swapEvt1 });

            // 互换后待实现≈当天新计（攒的10天付了，但当天又产生1天新计）
            decimal dailyInc = Math.Round(Principal * FixedRate / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
            AssertDecimal(dailyInc, swapResult1.InterestIncomeSum, "第一次互换后待实现≈当天新计");
            decimal firstRealized = swapResult1.TdCloseInterest;
            Console.WriteLine($"Phase2: 第一次互换 TdCloseInterest={firstRealized:F6}, 待实现={swapResult1.InterestIncomeSum:F6}");

            // --- Phase 3: 再攒5天 ---
            decimal runningSum = swapResult1.InterestIncomeSum;
            var runningDate = swapDate1.AddDays(1);
            for (int i = 0; i < 5; i++)
            {
                var svc = new StubEodPositionService();
                var preEod = CreatePreEod(runningDate.AddDays(-1), runningSum);
                // 需要 preEod.RealizedInterest 累积
                preEod.RealizedInterest = swapResult1.RealizedInterest;
                svc.ExecuteDealInterests(new List<swap_position> { position },
                    new List<eod_swap_position> { preEod }, runningDate, td,
                    new List<swap_flow_event>(), Principal, 0m, 0m, 1m, Principal);
                runningSum = svc.PersistedPositions[0].InterestIncomeSum;
                runningDate = runningDate.AddDays(1);
            }
            Console.WriteLine($"Phase3: 再攒5天后 InterestIncomeSum={runningSum:F6}");

            // --- Phase 4: 再互换结清 ---
            var svc4 = new StubEodPositionService();
            var preEodFinal = CreatePreEod(runningDate.AddDays(-1), runningSum);
            preEodFinal.RealizedInterest = swapResult1.RealizedInterest;
            var swapEvt2 = CreateSwapFlowEvent(runningDate, runningSum);
            var swapResult2 = svc4.ExecuteSaveEodInterestPosition(
                preEodFinal, null, position, td, runningDate, new List<swap_flow_event> { swapEvt2 });
            decimal secondRealized = swapResult2.TdCloseInterest;
            Console.WriteLine($"Phase4: 第二次互换 TdCloseInterest={secondRealized:F6}, 待实现={swapResult2.InterestIncomeSum:F6}");

            // 守恒：两次互换实现的 + 最终待实现 = 全程天数 × dailyInc
            // 全程天数 = 10天(Phase1) + 1天(第一次互换当天新计) + 5天(Phase3) + 1天(第二次互换当天新计) = 17天
            // 但第一次互换的当天新计进了 InterestIncomeSum 没进 TdCloseInterest，
            // 第二次互换同理。所以守恒 = RealizedInterest合计 + 最终InterestIncomeSum = 全程利息
            decimal totalDays = 10 + 1 + 5 + 1; // 17天
            decimal expectedTotalInterest = Math.Round(Principal * FixedRate * totalDays / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
            decimal actualTotal = swapResult2.RealizedInterest + swapResult2.InterestIncomeSum;
            Console.WriteLine($"守恒: RealizedInterest({swapResult2.RealizedInterest:F6}) + InterestIncomeSum({swapResult2.InterestIncomeSum:F6}) = {actualTotal:F6}");
            Console.WriteLine($"期望: {totalDays}天 × {dailyInc:F6} = {expectedTotalInterest:F6}");
            AssertDecimal(expectedTotalInterest, actualTotal,
                "已实现+待实现 应=全程利息（守恒）");
        }

        #endregion

        // ================================================================
        // 场景5：预付金腿（marginTypes ratio 翻转）符号验证
        // ================================================================

        #region 场景5：预付金腿 ratio 翻转

        /// <summary>
        /// [DI_MARGIN_001] 预付金腿互换结清后 RealizedInterest 应为负（支付方向）
        /// ---------------------------------------------------------------
        /// 预付金腿 InterestDirection=收取(1)，但 marginTypes 会把 ratio 翻转为 -1。
        /// SwapPositionValue 应为负（负债），RealizedInterest 也应为负（券商支付）。
        /// 验证 cs:789-793 的 ratio 翻转逻辑。
        /// ---------------------------------------------------------------
        /// </summary>
        [TestMethod]
        public void DI_MARGIN_001_预付金腿RealizedInterest为负()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var settleDate = new DateTime(2026, 5, 10);

            // 预付金腿（初始预付金 InterestMode=5，InterestDirection=收取）
            var marginPosition = new swap_position
            {
                id = 2001, SwapTradeId = 1, PositionType = (int)PositionTypeFlag.Unknown,
                InterestDirection = (int)SwapDirectionEnum.收取, InterestMode = (int)InterestModeEnum.初始预付金,
                InterestRateDefault = 0.005m, InterestPrincipalFix = 500m,
                PosiStartDate = StartDate, PosiMatuirityDate = ExerciseDate,
                IsInitial = true, Invalid = false, InterestType = (int)InterestTypeEnum.单利,
                IsAnnualized = true, interest_rest_days = 1, interest_rule = 0,
                FloatRateUnderlyingCode = null,
                InterestSwapInterval = null
            };

            // 攒10天的预付金利息
            decimal marginDaily = Math.Round(500m * 0.005m / AnnualDays,
                ConsGlobal.PriceRound, MidpointRounding.AwayFromZero);
            decimal margin10days = marginDaily * 10;
            var preEod = new eod_swap_position
            {
                id = 200, SwapTradeId = 1, PositionId = 2001, ValueDate = settleDate.AddDays(-1),
                ClientId = 999998, InterestDirection = (int)SwapDirectionEnum.收取,
                InterestMode = (int)InterestModeEnum.初始预付金,
                InterestIncomeSum = margin10days, InterestProfitSum = margin10days,
                RealizedInterest = 0m, InterestRateDefault = 0.005m,
                TdInterestPrincipal = 500m, PosiNotionalValue = 500m,
                InterestType = (int)InterestTypeEnum.单利, IsAnnualized = true,
                interest_rest_days = 1, FloatRate = 0m
            };

            // 互换结清
            var swapEvent = new swap_flow_event
            {
                id = 3001, SwapTradeId = 1, EventType = (int)SwapFlowEventTypeEnum.互换,
                EventDate = settleDate, UnwindDate = settleDate, PositionId = 2001,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestAmount = margin10days, InterestClosePnL = -margin10days, // 预付金 ratio 翻转后为负
                InterestRate = 0.005m, InterestMode = (int)InterestModeEnum.初始预付金,
                InterestPrincipal = 500m, FloatRate = 0m,
                DataState = (int)SwapFlowDateStateEnum.完成
            };

            var result = service.ExecuteSaveEodInterestPosition(
                preEod, null, marginPosition, td, settleDate, new List<swap_flow_event> { swapEvent });

            // 预付金 marginTypes 翻转 ratio=-1
            // RealizedInterest = 0 + TdCloseInterest(margin10days) * ratio(-1) = -margin10days
            AssertDecimal(-margin10days, result.RealizedInterest,
                "预付金腿 RealizedInterest 应为负（ratio翻转后支付方向）");
            Console.WriteLine($"预付金腿 RealizedInterest={result.RealizedInterest:F6}（负=支付）✅");
            Console.WriteLine($"SwapPositionValue={result.SwapPositionValue:F6}（应≈当天新计×ratio=-正）");
        }

        #endregion

        // ================================================================
        // 场景6：自动互换两位实际结算与到期清零
        // ================================================================

        #region 场景6：自动互换尾差与最终结算

        /// <summary>
        /// [DI_AUTO_SETTLEMENT_001] 非最终自动互换：实际结算按两位，尾差继续保留在待实现。
        /// 0.0082 四舍五入后实际结算 0.01，待实现应为 0.0082 - 0.01 = -0.0018。
        /// </summary>
        [TestMethod]
        public void DI_AUTO_SETTLEMENT_001_非最终自动互换保留舍入尾差()
        {
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event> { CreateAutoSwapFlowEvent(new DateTime(2026, 5, 10), 0.0082m) }
            };
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var result = service.ExecuteSaveAutoEodInterestPosition(
                CreatePreEod(new DateTime(2026, 5, 9), 0m), position, td, new DateTime(2026, 5, 10),
                new IntervalModel { Date = new DateTime(2026, 5, 10), Rate = FixedRate, Settlement = 1 });

            AssertDecimal(0.01m, result.TdCloseInterest, "日终当日已实现必须使用两位实际结算金额");
            AssertDecimal(-0.0018m, result.InterestIncomeSum, "非最终结算的尾差必须继续留在待实现");
            AssertDecimal(0.01m, service.AutoInterests.Single().InterestAmount, "自动互换流水金额必须为两位");
            AssertDecimal(0.01m, service.AutoInterests.Single().InterestClosePnL, "资金汇总使用的流水损益必须为两位");
        }

        /// <summary>
        /// [DI_AUTO_SETTLEMENT_002] 到期自动互换：仍按两位实际结算，但不存在后续计息时待实现必须清零。
        /// </summary>
        [TestMethod]
        public void DI_AUTO_SETTLEMENT_002_到期自动互换清零待实现()
        {
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event> { CreateAutoSwapFlowEvent(ExerciseDate, 0.0082m) }
            };
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var result = service.ExecuteSaveAutoEodInterestPosition(
                CreatePreEod(ExerciseDate.AddDays(-1), 0m), position, td, ExerciseDate,
                new IntervalModel { Date = ExerciseDate, Rate = FixedRate, Settlement = 1 });

            AssertDecimal(0.01m, result.TdCloseInterest, "到期自动结算仍按金额两位落库");
            AssertDecimal(0m, result.InterestIncomeSum, "到期最终自动结算后不得遗留待实现尾差");
        }

        /// <summary>
        /// [DI_AUTO_SETTLEMENT_003] 自动互换后的后续部分平仓必须续接尾差和累计已实现。
        /// 7/7 自动互换将 0.008191780822 按 0.01 实际结算，留下 -0.001808219178；
        /// 7/8 平仓一半后，待实现继续参与计算，7/9 全平时才清零。
        /// </summary>
        [TestMethod]
        public void DI_AUTO_SETTLEMENT_003_自动互换后部分平仓续接尾差和已实现()
        {
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event>
                {
                    CreateAutoSwapFlowEvent(new DateTime(2026, 5, 10), 0.008191780822m)
                }
            };
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var autoResult = service.ExecuteSaveAutoEodInterestPosition(
                CreatePreEod(new DateTime(2026, 5, 9), 0m), position, td, new DateTime(2026, 5, 10),
                new IntervalModel { Date = new DateTime(2026, 5, 10), Rate = FixedRate, Settlement = 1 });

            var firstCloseDate = new DateTime(2026, 5, 11);
            var firstCloseFlow = CreateSwapFlowEvent(firstCloseDate, 0.01m);
            firstCloseFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            firstCloseFlow.InterestPrincipal = 50m;
            // 模拟 CalcUnwindInterest：上日尾差加当日新增，尚未扣除本次 0.01 平仓结算。
            service.AutoInterests = new List<swap_flow_event>
            {
                CreateAutoSwapFlowEvent(firstCloseDate, 0.016383561644m)
            };
            service.AutoInterests[0].InterestPrincipal = 50m;
            var firstCloseResult = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                autoResult, position, td, firstCloseDate, null, 50m, 0m,
                new List<swap_flow_event> { firstCloseFlow }, 50m, false);

            AssertDecimal(-0.001808219178m, service.LastInterestCalculationEodPosition.InterestProfitSum,
                "部分平仓计算必须带入自动互换遗留的待实现尾差");
            Assert.AreEqual(position.id, service.LastInterestCalculationEodPosition.PositionId,
                "部分平仓计息必须按腿标识匹配上一日日终");
            AssertDecimal(-0.010438356164m, firstCloseResult.InterestIncomeSum,
                "部分平仓后待实现应延续历史尾差");
            AssertDecimal(0.02m, firstCloseResult.RealizedInterest,
                "部分平仓后累计已实现应包含此前自动互换和本次平仓");

            var finalCloseDate = firstCloseDate.AddDays(1);
            var finalCloseFlow = CreateSwapFlowEvent(finalCloseDate, 0.01m);
            finalCloseFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            finalCloseFlow.InterestPrincipal = 50m;
            service.AutoInterests = new List<swap_flow_event>
            {
                CreateAutoSwapFlowEvent(finalCloseDate, 0.010479452055m)
            };
            var finalCloseResult = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                firstCloseResult, position, td, finalCloseDate, null, 0m, 0m,
                new List<swap_flow_event> { finalCloseFlow }, 50m, false);

            AssertDecimal(0m, finalCloseResult.InterestIncomeSum, "全平后待实现应清零");
            AssertDecimal(0.03m, finalCloseResult.RealizedInterest,
                "全平后累计已实现应包含自动互换和两次平仓");
        }

        [TestMethod]
        public void DI_AUTO_SETTLEMENT_004_PartialCloseAccruesOnlyAfterPreviousEod()
        {
            const decimal originalNotional = 10012.35m;
            const decimal remainingNotional = 5006.17m;
            const decimal closeNotional = 5006.172835m;
            const decimal rate = 0.0299m;
            const decimal pendingInterest = 0.820379534246m;
            const decimal settledInterest = 0.82m;
            const decimal expectedPendingInterest = 0.410474008219m;
            var service = new StubEodPositionService();
            var td = CreateTrade();
            td.trade_extend.ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
            {
                AnnualDays = AnnualDays,
                InterestCalcMode = "01",
                SettlementRules = 0
            });
            var position = CreateInterestPosition();
            position.InterestRateDefault = rate;
            position.InterestSwapInterval = null;
            var previousEodDate = StartDate.AddDays(2);
            var closeDate = previousEodDate.AddDays(1);
            var previousEod = CreatePreEod(previousEodDate, pendingInterest, settledInterest);
            previousEod.TdInterestPrincipal = originalNotional;
            var closeFlow = CreateSwapFlowEvent(closeDate, settledInterest);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            closeFlow.InterestPrincipal = 5006.18m;
            closeFlow.InterestRate = rate;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                previousEod, position, td, closeDate, null,
                remainingNotional, 0m, new List<swap_flow_event> { closeFlow },
                closeNotional, false);

            AssertDecimal(expectedPendingInterest, result.InterestIncomeSum,
                "Partial close must accrue only the day after the previous EOD snapshot");
            AssertDecimal(remainingNotional, result.TdInterestPrincipal,
                "The close-day snapshot must carry the remaining principal into the next EOD");
            AssertDecimal(1.64m, result.RealizedInterest,
                "Realized interest must include the previous and current settlements");
            Assert.AreEqual(previousEodDate, service.LastInterestCalculationEodPosition.ValueDate,
                "The previous EOD ValueDate must be preserved for accrual boundaries");
            Assert.AreEqual(previousEod.id, service.LastInterestCalculationEodPosition.id,
                "The previous EOD identity must not be reset to a new position");
        }

        [TestMethod]
        public void DI_COMPOUND_RESET_PARTIAL_CLOSE_UsesCalculatedPrincipal()
        {
            const decimal remainingNotional = 500m;
            const decimal compoundPrincipalAfterSevenDays = 500.958904m;
            var closeDate = StartDate.AddDays(7);
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event>
                {
                    new swap_flow_event
                    {
                        InterestPrincipal = compoundPrincipalAfterSevenDays,
                        InterestRate = FixedRate,
                        InterestAmount = 0m,
                        TdInterestAmount = 0m
                    }
                }
            };
            var td = CreateTrade();
            var position = CreateInterestPosition();
            position.InterestType = (int)InterestTypeEnum.复利;
            position.interest_rest_days = 7;
            var closeFlow = CreateSwapFlowEvent(closeDate, 0m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                CreatePreEod(closeDate.AddDays(-1), 0m), position, td, closeDate, null,
                remainingNotional, 0m, new List<swap_flow_event> { closeFlow }, remainingNotional, false);

            AssertDecimal(compoundPrincipalAfterSevenDays, result.TdInterestPrincipal,
                "复利重置日部分平仓后，EOD 本金必须保留 CalcSwapInterests 计算的 7 天复利本金");
        }

        [TestMethod]
        public void DI_MANUAL_PREPAY_PARTIAL_CLOSE_UsesHistoryPlusRemainingDailyInterest()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var position = CreateInterestPosition();
            position.InterestMode = (int)InterestModeEnum.初始预付金;
            position.InterestPrincipalFix = Principal;
            var previousEod = CreatePreEod(StartDate.AddDays(2), 100m);
            previousEod.InterestMode = position.InterestMode;
            previousEod.TdInterestPrincipal = Principal;
            var closeFlow = CreateSwapFlowEvent(StartDate.AddDays(3), 50m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            closeFlow.InterestPrincipal = 500m;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                previousEod, position, td, StartDate.AddDays(3), null,
                500m, 0m, new List<swap_flow_event> { closeFlow }, 500m, false);

            var expected = previousEod.InterestIncomeSum
                + result.TdInterestIncome - result.TdCloseInterest;
            AssertDecimal(expected, result.InterestIncomeSum,
                "预付金部分平仓待实现收益应为历史待实现+平仓后当日新增-平仓实现");
        }

        [DataTestMethod]
        [DataRow((int)InterestModeEnum.合约名义本金规模)]
        [DataRow((int)InterestModeEnum.标的期初全价)]
        public void DI_MANUAL_PARTIAL_CLOSE_CalcLastIncludesClosedPrincipalDailyInterest(int interestMode)
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            td.trade_extend.ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
            {
                AnnualDays = AnnualDays,
                InterestCalcMode = "11",
                SettlementRules = 0
            });
            var position = CreateInterestPosition();
            position.InterestMode = interestMode;
            var previousEod = CreatePreEod(StartDate.AddDays(2), 100m);
            previousEod.TdInterestPrincipal = Principal;
            var closeFlow = CreateSwapFlowEvent(StartDate.AddDays(3), 50m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                previousEod, position, td, StartDate.AddDays(3), null,
                500m, 0m, new List<swap_flow_event> { closeFlow }, 500m, false);

            AssertDecimal(Principal * FixedRate / AnnualDays, result.TdInterestIncome,
                "算尾部分平仓的当日新计利息应包含已平仓部分（按全额本金计提）");
            AssertDecimal(500m, result.TdInterestPrincipal,
                "算尾部分平仓后的 EOD 本金应只携带剩余持仓");

            // 补充：算尾部分平仓的待实现利息总额应满足递推
            //   InterestIncomeSum = 前日待实现 + 当日新计(全额本金，含被平仓部分) - 当日实现
            // 钉死"算尾 → 被平仓部分多1天利息 → 进入待实现总额"的完整链条
            decimal expectedIncomeSum = previousEod.InterestIncomeSum + result.TdInterestIncome - result.TdCloseInterest;
            AssertDecimal(expectedIncomeSum, result.InterestIncomeSum,
                "算尾部分平仓：InterestIncomeSum 应=前日待实现+当日新计(含被平仓部分)-当日实现");
        }

        [TestMethod]
        public void DI_MANUAL_PARTIAL_CLOSE_NoCalcLastUsesRemainingPrincipalDailyInterest()
        {
            var service = new StubEodPositionService();
            var td = CreateTrade();
            var position = CreateInterestPosition();
            var previousEod = CreatePreEod(StartDate.AddDays(2), 100m);
            previousEod.TdInterestPrincipal = Principal;
            var closeFlow = CreateSwapFlowEvent(StartDate.AddDays(3), 50m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                previousEod, position, td, StartDate.AddDays(3), null,
                500m, 0m, new List<swap_flow_event> { closeFlow }, 500m, false);

            AssertDecimal(500m * FixedRate / AnnualDays, result.TdInterestIncome,
                "不算尾部分平仓的当日新计利息只应包含剩余持仓部分（按剩余本金计提）");

            // 补充对照：不算尾时待实现利息总额同样满足递推，但当日新计只含剩余持仓
            //   与 CalcLast 测试对照：不算尾的 TdInterestIncome 更小（差额=被平仓部分1天利息），
            //   因此 InterestIncomeSum 也相应更小——证明算尾/不算尾的差异确实传导到待实现总额
            decimal expectedIncomeSum = previousEod.InterestIncomeSum + result.TdInterestIncome - result.TdCloseInterest;
            AssertDecimal(expectedIncomeSum, result.InterestIncomeSum,
                "不算尾部分平仓：InterestIncomeSum 应=前日待实现+当日新计(仅剩余持仓)-当日实现");
        }

        [TestMethod]
        public void DI_AUTO_SETTLEMENT_005_AutoSettlementKeepsRemainingPrincipal()
        {
            const decimal originalNotional = 10012.35m;
            const decimal remainingNotional = 5006.17m;
            const decimal rate = 0.0299m;
            var settlementDate = new DateTime(2026, 7, 14);
            var service = new StubEodPositionService();
            var td = CreateTrade();
            td.trade_extend.ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
            {
                AnnualDays = AnnualDays,
                InterestCalcMode = "01",
                SettlementRules = 0
            });
            var position = CreateInterestPosition();
            position.InterestRateDefault = rate;
            position.InterestSwapInterval = null;
            var previousEod = CreatePreEod(settlementDate.AddDays(-1), 2.460947197259m, 1.64m);
            previousEod.TdInterestPrincipal = remainingNotional;
            var staleAggregate = new eod_swap { NotionalValue = originalNotional };

            var result = service.ExecuteSaveAutoEodInterestPosition(
                previousEod, position, td, settlementDate,
                new IntervalModel { Date = settlementDate, Rate = rate, Settlement = 1 },
                staleAggregate, remainingNotional, originalNotional);

            AssertDecimal(2.87m, result.TdCloseInterest,
                "Automatic settlement must round the half-position interest to 2.87");
            AssertDecimal(remainingNotional, result.TdInterestPrincipal,
                "Automatic settlement must not restore the original principal from eod_swap");
        }

        [TestMethod]
        public void DI_AUTO_SETTLEMENT_006_CloseAndAutoSettlementOnlySettlesRemainder()
        {
            var settleDate = new DateTime(2026, 7, 16);
            var autoFlow = CreateAutoSwapFlowEvent(settleDate, 1.2345m);
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event> { autoFlow }
            };
            var closeFlow = CreateSwapFlowEvent(settleDate, 0.50m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                CreatePreEod(settleDate.AddDays(-1), 0m), CreateInterestPosition(), CreateTrade(),
                settleDate, new IntervalModel { Date = settleDate, Rate = FixedRate, Settlement = 1 },
                50m, 0m, new List<swap_flow_event> { closeFlow }, 50m, true);

            AssertDecimal(0.73m, autoFlow.InterestAmount,
                "Automatic settlement must deduct the 0.50 already settled by the close");
            AssertDecimal(0.73m, autoFlow.InterestClosePnL,
                "The automatic flow PnL must use the actual 2-decimal remainder");
            AssertDecimal(1.23m, result.TdCloseInterest,
                "EOD realized interest must include both manual and automatic settlements");
            AssertDecimal(0.0045m, result.InterestIncomeSum,
                "The high-precision total less actual settlements must remain unrealized");
            AssertDecimal(1.23m, result.RealizedInterest,
                "Cumulative realized interest must add the combined actual settlement once");
        }

        [TestMethod]
        public void DI_AUTO_SETTLEMENT_007_PayLegKeepsUnsignedSettlementAndAppliesDirectionOnce()
        {
            var settleDate = new DateTime(2026, 7, 16);
            var autoFlow = CreateAutoSwapFlowEvent(settleDate, 1.2345m);
            autoFlow.InterestDirection = (int)SwapDirectionEnum.支付;
            autoFlow.InterestClosePnL = -1.2345m;
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event> { autoFlow }
            };
            var position = CreateInterestPosition();
            position.InterestDirection = (int)SwapDirectionEnum.支付;
            var closeFlow = CreateSwapFlowEvent(settleDate, 0.50m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            closeFlow.InterestDirection = (int)SwapDirectionEnum.支付;
            closeFlow.InterestClosePnL = -0.50m;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                CreatePreEod(settleDate.AddDays(-1), 0m), position, CreateTrade(), settleDate,
                new IntervalModel { Date = settleDate, Rate = FixedRate, Settlement = 1 },
                50m, 0m, new List<swap_flow_event> { closeFlow }, 50m, true);

            AssertDecimal(0.73m, autoFlow.InterestAmount);
            AssertDecimal(-0.73m, autoFlow.InterestClosePnL);
            AssertDecimal(1.23m, result.TdCloseInterest,
                "TdCloseInterest follows the unsigned settlement convention used by other interest branches");
            AssertDecimal(0.0045m, result.InterestIncomeSum);
            AssertDecimal(-1.23m, result.RealizedInterest,
                "The pay direction must be applied exactly once when cumulative realized interest is stored");
        }

        [TestMethod]
        public void DI_AUTO_SETTLEMENT_008_MarginLegAppliesReversedDirectionOnce()
        {
            var settleDate = new DateTime(2026, 7, 16);
            var autoFlow = CreateAutoSwapFlowEvent(settleDate, 1.2345m);
            autoFlow.InterestMode = (int)InterestModeEnum.初始预付金;
            var service = new StubEodPositionService
            {
                AutoInterests = new List<swap_flow_event> { autoFlow }
            };
            var position = CreateInterestPosition();
            position.InterestMode = (int)InterestModeEnum.初始预付金;
            position.InterestPrincipalFix = 50m;
            var closeFlow = CreateSwapFlowEvent(settleDate, 0.50m);
            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            closeFlow.InterestMode = (int)InterestModeEnum.初始预付金;

            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
                CreatePreEod(settleDate.AddDays(-1), 0m), position, CreateTrade(), settleDate,
                new IntervalModel { Date = settleDate, Rate = FixedRate, Settlement = 1 },
                50m, 0m, new List<swap_flow_event> { closeFlow }, 50m, true);

            AssertDecimal(0.73m, autoFlow.InterestAmount);
            AssertDecimal(0.73m, autoFlow.InterestClosePnL);
            AssertDecimal(1.23m, result.TdCloseInterest);
            AssertDecimal(0.0045m, result.InterestIncomeSum);
            AssertDecimal(-1.23m, result.RealizedInterest,
                "A received margin principal produces payable interest, so the margin ratio reverses once");
        }

        [TestMethod]
        public void DI_MANUAL_CLOSE_006_FinalCloseIncludesCloseDateInterest()
        {
            const decimal originalNotional = 10012.35m;
            const decimal remainingNotional = 5006.17m;
            const decimal rate = 0.0299m;
            const decimal pendingInterest = 0.411136145205m;
            const decimal expectedInterest = 0.821230619178m;
            var closeDate = new DateTime(2026, 7, 16);
            var service = new StubEodPositionService();
            var td = CreateTrade();
            td.trade_extend.ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
            {
                AnnualDays = AnnualDays,
                InterestCalcMode = "01",
                SettlementRules = 0
            });
            var position = CreateInterestPosition();
            position.InterestRateDefault = rate;
            position.InterestSwapInterval = null;
            var previousEod = CreatePreEod(closeDate.AddDays(-1), pendingInterest, 4.51m);
            previousEod.TdInterestPrincipal = remainingNotional;
            var previousFloatingPosition = new eod_swap_position
            {
                PosiDirection = (int)SwapDirectionEnum.支付,
                PosiNotionalValue = remainingNotional
            };
            var previousAggregate = new eod_swap
            {
                NotionalValue = originalNotional,
                NotionalValueLong = remainingNotional
            };
            var orginPv = SwapDealService.ResolveUnwindPreviousNotional(
                previousAggregate, new List<eod_swap_position> { previousEod, previousFloatingPosition },
                remainingNotional);

            AssertDecimal(remainingNotional, SwapDealService.ResolveUnwindPreviousNotional(
                previousAggregate, Array.Empty<eod_swap_position>(), originalNotional),
                "Missing details must fall back to the aggregate directional notionals");
            AssertDecimal(remainingNotional, SwapDealService.ResolveUnwindPreviousNotional(
                null, null, remainingNotional),
                "Missing EOD data must fall back to the current notional");
            AssertDecimal(remainingNotional, SwapDealService.ResolveUnwindPreviousNotional(
                new eod_swap { NotionalValue = originalNotional }, Array.Empty<eod_swap_position>(),
                remainingNotional),
                "Zero directional notionals must not override a non-zero current remaining notional");

            var result = new SwapDealService(service).GetInterests(
                td, td.trade_extend, closeDate, closeDate,
                new List<eod_swap_position> { previousEod }, new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 1m, orginPv,
                false, settment: false, newCalcLast: false, closeList: null).Single();

            AssertDecimal(remainingNotional, result.InterestPrincipal,
                "Final close must accrue on the remaining principal");
            AssertDecimal(expectedInterest, result.InterestAmount,
                "InterestCalcMode 01 must include the final close date");
            AssertDecimal(0.82m, Math.Round(result.InterestAmount, ConsGlobal.MoneyRound,
                MidpointRounding.AwayFromZero), "Final close cash interest must be 0.82");
        }

        [TestMethod]
        public void DI_MANUAL_CLOSE_007_CompoundFinalCloseSettlesFirstPartialCloseRoundingTail()
        {
            const decimal originalNotional = 10012.35m;
            const decimal remainingNotional = originalNotional / 2m;
            const decimal rate = 0.0299m;
            var firstCloseDate = StartDate.AddDays(6);
            var finalCloseDate = firstCloseDate.AddDays(6);
            var td = CreateTrade();
            td.trade_extend.ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
            {
                AnnualDays = AnnualDays,
                InterestCalcMode = "11",
                SettlementRules = 0
            });
            var position = CreateInterestPosition();
            position.InterestType = (int)InterestTypeEnum.复利;
            position.InterestRateDefault = rate;
            position.InterestPrincipalFix = originalNotional;
            position.interest_rest_days = 1;
            position.InterestSwapInterval = null;
            var dealService = new StubCompoundSwapDealService();
            var eodService = new StubEodPositionService { DealService = dealService };

            var firstCloseInterest = dealService.GetInterests(
                td, td.trade_extend, firstCloseDate, firstCloseDate,
                new List<eod_swap_position>(), new List<swap_position> { position },
                originalNotional, originalNotional, 0m, remainingNotional, 0.5m,
                (int)SwapEventTypeEnum.平仓, false, false, 1m, originalNotional,
                settment: false).Single();
            var firstCloseCash = Math.Round(firstCloseInterest.InterestAmount, ConsGlobal.MoneyRound,
                MidpointRounding.AwayFromZero);
            var firstCloseRoundingTail = firstCloseInterest.InterestAmount - firstCloseCash;
            Assert.AreNotEqual(0m, firstCloseRoundingTail,
                $"首次部分平仓高精度利息 {firstCloseInterest.InterestAmount:F12} 按两位实际结算 {firstCloseCash:F2}，尾差 {firstCloseRoundingTail:F12}");
            var firstCloseFlow = CreateSwapFlowEvent(firstCloseDate, firstCloseCash);
            firstCloseFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            firstCloseFlow.InterestPrincipal = remainingNotional;
            var firstCloseEod = eodService.ExecuteSaveAutoEodWithCloseInterestPosition(
                null, position, td, firstCloseDate, null, remainingNotional, 0m,
                new List<swap_flow_event> { firstCloseFlow }, remainingNotional, false);

            var replayAtPreviousEod = dealService.GetInterests(
                td, td.trade_extend, firstCloseDate, firstCloseDate,
                new List<eod_swap_position>(), new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 1m, originalNotional,
                settment: false).Single();
            var replayAtFinalClose = dealService.GetInterests(
                td, td.trade_extend, finalCloseDate, finalCloseDate,
                new List<eod_swap_position>(), new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 1m, originalNotional,
                settment: false).Single();
            var expectedFinalInterest = firstCloseEod.InterestIncomeSum
                + replayAtFinalClose.InterestAmount - replayAtPreviousEod.InterestAmount;
            var expectedFinalCash = Math.Round(expectedFinalInterest, ConsGlobal.MoneyRound,
                MidpointRounding.AwayFromZero);
            var expectedTotalCash = Math.Round(firstCloseCash + firstCloseEod.InterestIncomeSum
                + replayAtFinalClose.InterestAmount - replayAtPreviousEod.InterestAmount,
                ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero);

            var finalCloseInterest = dealService.GetInterests(
                td, td.trade_extend, finalCloseDate, finalCloseDate,
                new List<eod_swap_position> { firstCloseEod }, new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 1m, originalNotional,
                settment: false).Single();
            var finalCloseCash = Math.Round(finalCloseInterest.InterestAmount, ConsGlobal.MoneyRound,
                MidpointRounding.AwayFromZero);
            var finalCloseFlow = CreateSwapFlowEvent(finalCloseDate, finalCloseCash);
            finalCloseFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            finalCloseFlow.InterestPrincipal = remainingNotional;
            var finalCloseEod = eodService.ExecuteSaveAutoEodWithCloseInterestPosition(
                firstCloseEod, position, td, finalCloseDate, null, 0m, 0m,
                new List<swap_flow_event> { finalCloseFlow }, remainingNotional, false);

            AssertDecimal(expectedFinalCash, finalCloseCash,
                "最终全平现金必须带走上一日日终的待实现利息尾差");
            AssertDecimal(expectedTotalCash,
                firstCloseCash + finalCloseCash,
                "两次实际结算现金必须守恒");
            AssertDecimal(0m, finalCloseEod.InterestIncomeSum, "全平且实际金额覆盖应结利息后待实现应清零");
            AssertDecimal(firstCloseCash + finalCloseCash, finalCloseEod.RealizedInterest,
                "累计已实现利息必须等于历次实际结算金额之和");

            var incompleteFinalCloseFlow = CreateSwapFlowEvent(finalCloseDate, finalCloseCash - 0.01m);
            incompleteFinalCloseFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
            incompleteFinalCloseFlow.InterestPrincipal = remainingNotional;
            var incompleteFinalCloseEod = eodService.ExecuteSaveAutoEodWithCloseInterestPosition(
                firstCloseEod, position, td, finalCloseDate, null, 0m, 0m,
                new List<swap_flow_event> { incompleteFinalCloseFlow }, remainingNotional, false);
            AssertDecimal(expectedFinalInterest - incompleteFinalCloseFlow.InterestAmount,
                incompleteFinalCloseEod.InterestIncomeSum,
                "最终全平流水少结 0.01 时，日终必须保留未结利息而非清零");
        }

        [TestMethod]
        public void DI_GLMS_20260421_0007_ContractNotionalCompoundPartialCloseScalesAndFinalCloseUsesRemainingPrincipal()
        {
            const decimal notional = 303139117.8m;
            const decimal partialPercent = 0.3m;
            const decimal partialNotional = notional * partialPercent;
            const decimal remainingNotional = notional - partialNotional;
            const decimal spread = 0.0025m;
            var startDate = new DateTime(2026, 4, 21);
            var maturityDate = new DateTime(2026, 5, 19);
            var partialCloseDate = new DateTime(2026, 5, 11);
            var td = new trade
            {
                id = 7007,
                TradeNumber = "GLMS-20260421-0007",
                ClientId = 999998,
                TradeType = "收益互换",
                TradeDate = startDate,
                StartDate = startDate,
                ExerciseDate = maturityDate,
                TradeStatus = "确认成交",
                ValidState = "Valid",
                trade_extend = new trade_extend
                {
                    TradeId = 7007,
                    ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
                    {
                        AnnualDays = AnnualDays,
                        InterestCalcMode = "11",
                        SettlementRules = 0
                    })
                }
            };
            var position = new swap_position
            {
                id = 70071,
                SwapTradeId = td.id,
                PositionType = (int)PositionTypeFlag.Unknown,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestMode = (int)InterestModeEnum.合约名义本金规模,
                InterestRateDefault = spread,
                InterestPrincipalFix = notional,
                PosiStartDate = startDate,
                PosiMatuirityDate = maturityDate,
                IsInitial = true,
                Invalid = false,
                InterestType = (int)InterestTypeEnum.复利,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0,
                FloatRateUnderlyingCode = "FR007",
                InterestSwapInterval = JsonConvert.SerializeObject(new List<IntervalModel>
                {
                    new IntervalModel { Date = maturityDate, Rate = spread, Settlement = 0 }
                })
            };
            var service = new StubCompoundSwapDealService(new Dictionary<DateTime, double>
            {
                [new DateTime(2026, 4, 20)] = 0.0132,
                [new DateTime(2026, 4, 21)] = 0.0132,
                [new DateTime(2026, 4, 22)] = 0.0132,
                [new DateTime(2026, 4, 23)] = 0.0132,
                [new DateTime(2026, 4, 24)] = 0.0131,
                [new DateTime(2026, 4, 27)] = 0.013502,
                [new DateTime(2026, 4, 28)] = 0.0136,
                [new DateTime(2026, 4, 29)] = 0.0138,
                [new DateTime(2026, 4, 30)] = 0.0139,
                [new DateTime(2026, 5, 4)] = 0.0139,
                [new DateTime(2026, 5, 5)] = 0.0139,
                [new DateTime(2026, 5, 6)] = 0.0136,
                [new DateTime(2026, 5, 7)] = 0.0136,
                [new DateTime(2026, 5, 8)] = 0.0135,
                [new DateTime(2026, 5, 9)] = 0.0131,
                [new DateTime(2026, 5, 11)] = 0.0134,
                [new DateTime(2026, 5, 12)] = 0.013,
                [new DateTime(2026, 5, 13)] = 0.0129,
                [new DateTime(2026, 5, 14)] = 0.013,
                [new DateTime(2026, 5, 15)] = 0.013,
                [new DateTime(2026, 5, 18)] = 0.0132,
                [new DateTime(2026, 5, 19)] = 0.0131
            });
            var previousEod = new eod_swap_position
            {
                id = 70072,
                SwapTradeId = td.id,
                PositionId = position.id,
                ValueDate = new DateTime(2026, 5, 10),
                TdInterestPrincipal = 303324019.3183441374m,
                InterestIncomeSum = 266674.349853521170m,
                InterestProfitSum = 266674.349853521170m,
                FloatRate = 0.0139m
            };

            var partial = service.GetInterests(
                td, td.trade_extend, partialCloseDate, partialCloseDate,
                new List<eod_swap_position> { previousEod }, new List<swap_position> { position },
                notional, notional, 0m, partialNotional, partialPercent,
                (int)SwapEventTypeEnum.平仓, false, false, 0m, notional,
                settment: false).Single();
            AssertDecimal(84090.95m, Math.Round(partial.InterestAmount, ConsGlobal.MoneyRound,
                MidpointRounding.AwayFromZero),
                "GLMS-20260421-0007 30% 复利合约名义本金平仓必须按比例结算");

            var final = service.GetInterests(
                td, td.trade_extend, maturityDate, maturityDate,
                new List<eod_swap_position>(), new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 0m, remainingNotional,
                settment: false, newCalcLast: true).Single();
            AssertDecimal(268428.73m, Math.Round(final.InterestAmount, ConsGlobal.MoneyRound,
                MidpointRounding.AwayFromZero),
                "后续全平必须只结算剩余70%本金的复利，不重复结算原始全额");
            Assert.AreNotEqual(280303.16m,
                Math.Round(final.InterestAmount, ConsGlobal.MoneyRound, MidpointRounding.AwayFromZero),
                "后续全平不得再次使用原始全额本金");
        }

        [TestMethod]
        public void DI_GLMS_20260421_0007_EodPartialCloseCarriesRemainingCompoundAccrual()
        {
            const decimal originalNotional = 303139117.8m;
            const decimal partialNotional = 90941735.34m;
            const decimal remainingNotional = 212197382.46m;
            const decimal spread = 0.0025m;
            var partialCloseDate = new DateTime(2026, 5, 11);
            var intermediateDate = new DateTime(2026, 5, 18);
            var finalCloseDate = new DateTime(2026, 5, 19);
            var td = new trade
            {
                id = 7007,
                TradeNumber = "GLMS-20260421-0007-EOD",
                ClientId = 999998,
                TradeType = "收益互换",
                TradeDate = new DateTime(2026, 4, 21),
                StartDate = new DateTime(2026, 4, 21),
                ExerciseDate = finalCloseDate,
                TradeStatus = "确认成交",
                ValidState = "Valid",
                StructureType = "单标的",
                QuoteCurrency = "CNY",
                SettlementCurrency = "CNY",
                trade_extend = new trade_extend
                {
                    TradeId = 7007,
                    ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
                    {
                        AnnualDays = AnnualDays,
                        InterestCalcMode = "11",
                        SettlementRules = 0
                    })
                }
            };
            var position = new swap_position
            {
                id = 70071,
                SwapTradeId = td.id,
                PositionType = (int)PositionTypeFlag.Unknown,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestMode = (int)InterestModeEnum.合约名义本金规模,
                InterestRateDefault = spread,
                InterestPrincipalFix = originalNotional,
                PosiStartDate = td.StartDate.Value,
                PosiMatuirityDate = finalCloseDate,
                IsInitial = true,
                Invalid = false,
                InterestType = (int)InterestTypeEnum.复利,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0,
                FloatRateUnderlyingCode = "FR007",
                InterestSwapInterval = JsonConvert.SerializeObject(new List<IntervalModel>
                {
                    new IntervalModel { Date = finalCloseDate, Rate = spread, Settlement = 0 }
                })
            };
            var dealService = new StubCompoundSwapDealService(new Dictionary<DateTime, double>
            {
                [new DateTime(2026, 4, 21)] = 0.0132,
                [new DateTime(2026, 4, 28)] = 0.0136,
                [new DateTime(2026, 4, 30)] = 0.0139,
                [new DateTime(2026, 5, 4)] = 0.0139,
                [new DateTime(2026, 5, 5)] = 0.0139,
                [new DateTime(2026, 5, 6)] = 0.0136,
                [new DateTime(2026, 5, 11)] = 0.0134,
                [new DateTime(2026, 5, 12)] = 0.013,
                [new DateTime(2026, 5, 13)] = 0.0129,
                [new DateTime(2026, 5, 19)] = 0.0131
            });
            var eodService = new StubEodPositionService { DealService = dealService };
            var previousEod = new eod_swap_position
            {
                id = 70072,
                SwapTradeId = td.id,
                PositionId = position.id,
                ValueDate = new DateTime(2026, 5, 10),
                InterestDirection = position.InterestDirection,
                InterestMode = position.InterestMode,
                InterestType = position.InterestType,
                InterestRateDefault = spread,
                InterestIncomeSum = 266674.349853521170m,
                InterestProfitSum = 266674.349853521170m,
                TdInterestPrincipal = 303324019.3183441374m,
                PosiNotionalValue = originalNotional,
                FloatRate = 0.0139m,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0
            };
            var partialCloseFlow = new swap_flow_event
            {
                SwapTradeId = td.id,
                PositionId = position.id,
                EventType = (int)SwapFlowEventTypeEnum.平仓,
                EventDate = partialCloseDate,
                UnwindDate = partialCloseDate,
                InterestDirection = position.InterestDirection,
                InterestRate = spread,
                InterestPrincipal = partialNotional,
                InterestAmount = 84090.95m,
                InterestClosePnL = 84090.95m,
                DataState = (int)SwapFlowDateStateEnum.完成
            };

            var partialEod = eodService.ExecuteSaveAutoEodWithCloseInterestPosition(
                previousEod, position, td, partialCloseDate, null, remainingNotional, 0m,
                new List<swap_flow_event> { partialCloseFlow }, partialNotional, false);
            AssertDecimal(13628.805251563956m, partialEod.TdInterestIncome,
                "5/11 EOD 当日新增复利必须按平仓前全额本金计提");
            AssertDecimal(196212.205105085126m, partialEod.InterestIncomeSum,
                "5/11 EOD 应保留部分平仓后的待实现复利");
            AssertDecimal(previousEod.TdInterestPrincipal * (1m - partialNotional / originalNotional),
                partialEod.TdInterestPrincipal,
                "5/11 EOD 跨日复利本金应保留剩余70%动态本金");

            var intermediateInterest = dealService.GetInterests(
                td, td.trade_extend, intermediateDate, intermediateDate,
                new List<eod_swap_position> { partialEod }, new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 0m, originalNotional,
                settment: false, newCalcLast: true).Single();
            Assert.IsTrue(Math.Abs(259348.386714765m - intermediateInterest.InterestAmount) <= 0.01m,
                $"5/18 复利平仓应承接 5/11 日终剩余本金的累计利息 Expected approximately 259348.386714765, Actual: {intermediateInterest.InterestAmount}");

        }

        [DataTestMethod]
        [DataRow((int)InterestModeEnum.合约名义本金规模)]
        [DataRow((int)InterestModeEnum.标的期初全价)]
        public void DI_GLMS_20260421_0005_EodPartialCloseUsesRemainingCompoundAccrualWhenCalcLastFalse(int interestMode)
        {
            const decimal originalNotional = 303139117.8m;
            const decimal partialNotional = 90941735.34m;
            const decimal remainingNotional = 212197382.46m;
            const decimal spread = 0.0025m;
            var partialCloseDate = new DateTime(2026, 5, 11);
            var finalCloseDate = new DateTime(2026, 5, 19);
            var td = new trade
            {
                id = 1828,
                TradeNumber = "GLMS-20260421-0005",
                ClientId = 999998,
                TradeType = "收益互换",
                TradeDate = new DateTime(2026, 4, 21),
                StartDate = new DateTime(2026, 4, 21),
                ExerciseDate = finalCloseDate,
                TradeStatus = "确认成交",
                ValidState = "Valid",
                StructureType = "单标的",
                QuoteCurrency = "CNY",
                SettlementCurrency = "CNY",
                trade_extend = new trade_extend
                {
                    TradeId = 1828,
                    ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
                    {
                        AnnualDays = AnnualDays,
                        InterestCalcMode = "10",
                        SettlementRules = 0
                    })
                }
            };
            var position = new swap_position
            {
                id = 18281,
                SwapTradeId = td.id,
                PositionType = (int)PositionTypeFlag.Unknown,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestMode = interestMode,
                InterestRateDefault = spread,
                InterestPrincipalFix = originalNotional,
                PosiStartDate = td.StartDate.Value,
                PosiMatuirityDate = finalCloseDate,
                IsInitial = true,
                Invalid = false,
                InterestType = (int)InterestTypeEnum.复利,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0,
                FloatRateUnderlyingCode = "FR007",
                InterestSwapInterval = JsonConvert.SerializeObject(new List<IntervalModel>
                {
                    new IntervalModel { Date = finalCloseDate, Rate = spread, Settlement = 0 }
                })
            };
            var dealService = new StubCompoundSwapDealService(new Dictionary<DateTime, double>
            {
                [new DateTime(2026, 4, 21)] = 0.0132,
                [new DateTime(2026, 4, 28)] = 0.0136,
                [new DateTime(2026, 4, 30)] = 0.0139,
                [new DateTime(2026, 5, 4)] = 0.0139,
                [new DateTime(2026, 5, 5)] = 0.0139,
                [new DateTime(2026, 5, 6)] = 0.0136,
                [new DateTime(2026, 5, 11)] = 0.0134,
                [new DateTime(2026, 5, 12)] = 0.013,
                [new DateTime(2026, 5, 13)] = 0.0129,
                [new DateTime(2026, 5, 19)] = 0.0131
            });
            var eodService = new StubEodPositionService { DealService = dealService };
            var previousEod = new eod_swap_position
            {
                id = 18282,
                SwapTradeId = td.id,
                PositionId = position.id,
                ValueDate = new DateTime(2026, 5, 10),
                InterestDirection = position.InterestDirection,
                InterestMode = position.InterestMode,
                InterestType = position.InterestType,
                InterestRateDefault = spread,
                InterestIncomeSum = 266674.349853521170m,
                InterestProfitSum = 266674.349853521170m,
                TdInterestPrincipal = 303324019.318344137434m,
                PosiNotionalValue = originalNotional,
                FloatRate = 0.0139m,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0
            };
            var partialCloseFlow = new swap_flow_event
            {
                SwapTradeId = td.id,
                PositionId = position.id,
                EventType = (int)SwapFlowEventTypeEnum.平仓,
                EventDate = partialCloseDate,
                UnwindDate = partialCloseDate,
                InterestDirection = position.InterestDirection,
                InterestRate = spread,
                InterestPrincipal = partialNotional,
                InterestAmount = 80002.30m,
                InterestClosePnL = 80002.30m,
                DataState = (int)SwapFlowDateStateEnum.完成
            };

            var partialEod = eodService.ExecuteSaveAutoEodWithCloseInterestPosition(
                previousEod, position, td, partialCloseDate, null, remainingNotional, 0m,
                new List<swap_flow_event> { partialCloseFlow }, partialNotional, false);

            AssertDecimal(9540.163676094769m, partialEod.TdInterestIncome,
                "0005 计算不算尾时，部分平仓日终新增复利必须按剩余70%本金计提");
            AssertDecimal(196212.213529615939m, partialEod.InterestIncomeSum,
                "0005 部分平仓后日终待实现复利必须扣除实际80002.30结算");
            AssertDecimal(previousEod.TdInterestPrincipal * (1m - partialNotional / originalNotional),
                partialEod.TdInterestPrincipal,
                "0005 部分平仓后，下一日复利本金必须只继承剩余70%本金");

            var intermediateDate = new DateTime(2026, 5, 18);
            var intermediateInterest = dealService.GetInterests(
                td, td.trade_extend, intermediateDate, intermediateDate,
                new List<eod_swap_position> { partialEod }, new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 0m, originalNotional,
                settment: false, newCalcLast: true).Single();
            Assert.IsTrue(Math.Abs(259348.386714765m - intermediateInterest.InterestAmount) <= 0.01m,
                $"0005 5/18 复利应承接部分平仓后的累计利息 Expected approximately 259348.386714765, Actual: {intermediateInterest.InterestAmount}");

            var intermediateEod = partialEod.Clone();
            intermediateEod.id = 18283;
            intermediateEod.ValueDate = intermediateDate;
            intermediateEod.InterestIncomeSum = intermediateInterest.InterestAmount;
            intermediateEod.InterestProfitSum = intermediateInterest.InterestAmount;
            intermediateEod.TdInterestPrincipal = remainingNotional;
            intermediateEod.PosiNotionalValue = remainingNotional;

            var expectedEndFlow = new swap_flow_event { InterestRate = spread };
            decimal expectedAmountAtEnd = 0m;
            decimal expectedTdAmountAtEnd = 0m;
            dealService.CalcDailyCompoundInterest(
                finalCloseDate, position, remainingNotional, expectedEndFlow, AnnualDays, false,
                intermediateEod.FloatRate, 1m, originalNotional, true, false,
                ref expectedAmountAtEnd, ref expectedTdAmountAtEnd);
            var expectedPreviousFlow = new swap_flow_event { InterestRate = spread };
            decimal expectedAmountAtPreviousEod = 0m;
            decimal expectedTdAmountAtPreviousEod = 0m;
            dealService.CalcDailyCompoundInterest(
                intermediateDate, position, remainingNotional, expectedPreviousFlow, AnnualDays, false,
                intermediateEod.FloatRate, 1m, originalNotional, true, true,
                ref expectedAmountAtPreviousEod, ref expectedTdAmountAtPreviousEod);
            var expectedFinalInterest = intermediateEod.InterestIncomeSum
                + expectedAmountAtEnd - expectedAmountAtPreviousEod;
            var finalInterest = dealService.GetInterests(
                td, td.trade_extend, finalCloseDate, finalCloseDate,
                new List<eod_swap_position> { intermediateEod }, new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 0m, originalNotional,
                settment: false, newCalcLast: false).Single();
            AssertDecimal(expectedFinalInterest, finalInterest.InterestAmount,
                "0005 最终全平重放时，历史5/18终点必须包含当日利息后再做差额");

        }

        [TestMethod]
        public void DI_GLMS_20260421_0006_FinalCloseCarriesPreviousEodInterest()
        {
            const decimal remainingNotional = 212197382.46m;
            const decimal expectedInterest = -119386.71m;
            var finalCloseDate = new DateTime(2026, 5, 19);
            var td = new trade
            {
                id = 6006,
                TradeNumber = "GLMS-20260421-0006",
                ClientId = 999998,
                TradeType = "收益互换",
                TradeDate = new DateTime(2026, 4, 21),
                StartDate = new DateTime(2026, 4, 22),
                ExerciseDate = finalCloseDate,
                TradeStatus = "确认成交",
                ValidState = "Valid",
                StructureType = "单标的",
                QuoteCurrency = "CNY",
                SettlementCurrency = "CNY",
                trade_extend = new trade_extend
                {
                    TradeId = 6006,
                    ExtendJson = JsonConvert.SerializeObject(new TradeExtendJson
                    {
                        AnnualDays = AnnualDays,
                        InterestCalcMode = "10",
                        SettlementRules = 0
                    })
                }
            };
            var position = new swap_position
            {
                id = 60061,
                SwapTradeId = td.id,
                PositionType = (int)PositionTypeFlag.Unknown,
                InterestDirection = (int)SwapDirectionEnum.收取,
                InterestMode = (int)InterestModeEnum.标的期初全价,
                InterestRateDefault = -0.021m,
                InterestPrincipalFix = remainingNotional,
                PosiStartDate = td.StartDate.Value,
                PosiMatuirityDate = td.ExerciseDate.Value,
                IsInitial = true,
                Invalid = false,
                InterestType = (int)InterestTypeEnum.复利,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0,
                FloatRateUnderlyingCode = "FR007",
                InterestSwapInterval = null
            };
            var previousEod = new eod_swap_position
            {
                id = 60062,
                SwapTradeId = td.id,
                PositionId = position.id,
                ValueDate = new DateTime(2026, 5, 18),
                InterestDirection = position.InterestDirection,
                InterestMode = position.InterestMode,
                InterestType = position.InterestType,
                InterestRateDefault = position.InterestRateDefault,
                FloatRate = 0.0132m,
                InterestIncomeSum = expectedInterest,
                InterestProfitSum = expectedInterest,
                TdInterestPrincipal = remainingNotional,
                PosiNotionalValue = remainingNotional,
                IsAnnualized = true,
                interest_rest_days = 7,
                interest_rule = 0
            };
            var dealService = new StubCompoundSwapDealService(new Dictionary<DateTime, double>
            {
                [new DateTime(2026, 4, 22)] = 0.0132,
                [new DateTime(2026, 4, 29)] = 0.0138,
                [new DateTime(2026, 5, 6)] = 0.0136,
                [new DateTime(2026, 5, 13)] = 0.0129,
                [new DateTime(2026, 5, 19)] = 0.0131
            });

            var result = dealService.GetInterests(
                td, td.trade_extend, finalCloseDate, finalCloseDate,
                new List<eod_swap_position> { previousEod }, new List<swap_position> { position },
                remainingNotional, remainingNotional, 0m, remainingNotional, 1m,
                (int)SwapEventTypeEnum.平仓, false, false, 0m, remainingNotional,
                settment: false).Single();

            AssertDecimal(expectedInterest, result.InterestAmount,
                "GLMS-20260421-0006 最终全平应承接 5/18 日终待实现利息");
            Assert.AreNotEqual(-123072.67m, result.InterestAmount,
                "不得回归旧库错误的 -123072.67 最终利息");
        }

        /// <summary>
        /// [DI_MATURITY_SETTLEMENT_001] 到期日存在手动互换但未带齐待实现时不能清零；
        /// 当前事件按两位覆盖全部可结金额后，才可视为最终结算并清零。
        /// </summary>
        [TestMethod]
        public void DI_MATURITY_SETTLEMENT_001_到期手动互换仅在结清后清零()
        {
            var settleDate = ExerciseDate;
            var td = CreateTrade();
            var position = CreateInterestPosition();
            position.InterestPrincipalFix = 0m;

            // 事件未结算此前的 0.0082：到期日也必须保留待实现。
            var incompleteService = new StubEodPositionService();
            var incompleteEvent = CreateSwapFlowEvent(settleDate, 0m);
            incompleteEvent.InterestPrincipal = 0m;
            incompleteEvent.InterestRate = 0m;
            var incompleteResult = incompleteService.ExecuteSaveEodInterestPosition(
                CreatePreEod(settleDate.AddDays(-1), 0.0082m), null, position, td, settleDate,
                new List<swap_flow_event> { incompleteEvent });
            AssertDecimal(0.0082m, incompleteResult.InterestIncomeSum, "到期但未结清时不得丢弃历史待实现");

            // 前端按两位提交 0.01，可覆盖 0.0082 的最终金额，允许清零。
            var finalService = new StubEodPositionService();
            var finalEvent = CreateSwapFlowEvent(settleDate, 0.01m);
            finalEvent.InterestPrincipal = 0m;
            finalEvent.InterestRate = 0m;
            var finalResult = finalService.ExecuteSaveEodInterestPosition(
                CreatePreEod(settleDate.AddDays(-1), 0.0082m), null, position, td, settleDate,
                new List<swap_flow_event> { finalEvent });
            AssertDecimal(0m, finalResult.InterestIncomeSum, "两位最终结算覆盖待实现后应清零");
        }

        #endregion

        #endregion
    }
}