using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using YLErp.DBModels;
using YLErp.DBModels.Consts;

namespace YLErp.Modules.SwapModule
{
    [TestClass]
    public class CorporateActionEventLifecycleTest
    {
        // 8/14 登记日只创建 Applied=false 的待生效事件；8/17 真实生效日补齐
        // 同一事件的调整前后快照并标记 Applied=true。
        private static readonly DateTime RecordDate = new DateTime(2026, 8, 14);
        private static readonly DateTime EffectiveDate = new DateTime(2026, 8, 17);

        [TestMethod]
        public void RegistrationSnapshot_IsPending_AndKeepsBeforeFields()
        {
            var info = CreateAction(77, ConsGlobal.InstrumentType.Stock);
            var before = CreateEodPosition(9, info.UnderlyingCode, 1000m, 100m);

            var snapshot = SwapEodPositionService.BuildCorporateActionEventData(
                info,
                before,
                null,
                applied: false);

            Assert.AreEqual(77, snapshot.ExDividendInfoId);
            Assert.AreEqual(9L, snapshot.PositionId);
            Assert.AreEqual(1000m, snapshot.BeforeQuantity);
            Assert.AreEqual(100m, snapshot.BeforePrice);
            Assert.AreEqual(100000m, snapshot.BeforeNotional);
            Assert.AreEqual(0m, snapshot.AfterQuantity);
            Assert.IsFalse(snapshot.Applied);

            var reason = SwapEventService.BuildCorporateActionEventReason(snapshot);
            StringAssert.Contains(reason, "调整前：名义本金：100000  期初标的价格：100 持仓数量：1000");
            StringAssert.Contains(reason, "调整后：名义本金：0  期初标的价格：0 持仓数量：0");
        }

        [TestMethod]
        public void EffectiveSnapshot_ContainsAfterFields_AndSupportsStockAndFund()
        {
            var info = CreateAction(78, ConsGlobal.InstrumentType.Fund);
            var before = CreateEodPosition(10, info.UnderlyingCode, 1000m, 100m);
            var after = CreateEodPosition(10, info.UnderlyingCode, 2000m, 50m);

            var snapshot = SwapEodPositionService.BuildCorporateActionEventData(
                info,
                before,
                after,
                applied: true);

            Assert.AreEqual(1000m, snapshot.BeforeQuantity);
            Assert.AreEqual(100m, snapshot.BeforePrice);
            Assert.AreEqual(2000m, snapshot.AfterQuantity);
            Assert.AreEqual(50m, snapshot.AfterPrice);
            Assert.AreEqual(100000m, snapshot.AfterNotional);
            Assert.IsTrue(snapshot.Applied);
            Assert.IsTrue(SwapEodPositionService.IsCorporateActionInstrument(ConsGlobal.InstrumentType.Stock));
            Assert.IsTrue(SwapEodPositionService.IsCorporateActionInstrument(ConsGlobal.InstrumentType.Fund));
            Assert.IsFalse(SwapEodPositionService.IsCorporateActionInstrument(ConsGlobal.InstrumentType.TBonds));
        }

        [TestMethod]
        public void Rerun_DoesNotCreateDuplicateCorporateActionEvent()
        {
            var info = CreateAction(79, ConsGlobal.InstrumentType.Stock);
            var snapshot = SwapEodPositionService.BuildCorporateActionEventData(
                info,
                CreateEodPosition(11, info.UnderlyingCode, 1000m, 100m),
                null,
                applied: false);
            var existing = new swap_event
            {
                SwapTradeId = 100,
                EventType = (int)SwapEventTypeEnum.公司行为,
                EventData = JsonConvert.SerializeObject(snapshot),
                Invalid = false
            };

            Assert.IsFalse(SwapEodPositionService.ShouldCreateCorporateActionEvent(
                new[] { existing },
                info,
                11L));
        }

        [TestMethod]
        public void LegacyEventWithoutExDividendInfoId_DoesNotBlockCurrentEvent()
        {
            var info = CreateAction(79, ConsGlobal.InstrumentType.Stock);
            var legacySnapshot = SwapEodPositionService.BuildCorporateActionEventData(
                info,
                CreateEodPosition(11, info.UnderlyingCode, 1000m, 100m),
                null,
                applied: false);
            legacySnapshot.ExDividendInfoId = 0;
            var legacyEvent = new swap_event
            {
                SwapTradeId = 100,
                EventType = (int)SwapEventTypeEnum.公司行为,
                EventData = JsonConvert.SerializeObject(legacySnapshot),
                Invalid = false
            };

            Assert.IsTrue(SwapEodPositionService.ShouldCreateCorporateActionEvent(
                new[] { legacyEvent },
                info,
                11L));
        }

        [TestMethod]
        public void OperationHistory_PreservesPendingCorporateActionForAudit()
        {
            var info = CreateAction(80, ConsGlobal.InstrumentType.Stock);
            var pendingData = SwapEodPositionService.BuildCorporateActionEventData(
                info,
                CreateEodPosition(12, info.UnderlyingCode, 1000m, 100m),
                null,
                applied: false);
            var appliedData = SwapEodPositionService.BuildCorporateActionEventData(
                info,
                CreateEodPosition(13, info.UnderlyingCode, 1000m, 100m),
                CreateEodPosition(13, info.UnderlyingCode, 2000m, 50m),
                applied: true);
            var events = new List<swap_event>
            {
                new swap_event { id = 1, EventType = (int)SwapEventTypeEnum.公司行为, EventData = JsonConvert.SerializeObject(pendingData) },
                new swap_event { id = 2, EventType = (int)SwapEventTypeEnum.公司行为, EventData = JsonConvert.SerializeObject(appliedData) },
                new swap_event { id = 3, EventType = (int)SwapEventTypeEnum.互换, EventData = "{}" }
            };

            // 操作历史不再隐藏登记日待生效事件；Applied=false 是事件状态，不是展示过滤条件。
            Assert.AreEqual(3, events.Count);
            Assert.IsTrue(SwapEventService.TryDeserializeCorporateActionEventData(events[0], out var pendingSnapshot));
            Assert.IsFalse(pendingSnapshot.Applied);
            Assert.IsTrue(SwapEventService.TryDeserializeCorporateActionEventData(events[1], out var appliedSnapshot));
            Assert.IsTrue(appliedSnapshot.Applied);
        }

        [TestMethod]
        public void EffectiveCorporateAction_AdjustsStockQuantityAndPrice()
        {
            var position = new swap_position
            {
                PositionId = 14,
                PosiDirection = 1,
                UnderlyingInstrumentType = ConsGlobal.InstrumentType.Stock,
                UnderlyingCode = "STOCK.TEST",
                PosiQuantity = 1000m,
                PosiGrossPrice = 100m,
                PosiNetPrice = 100m,
                ContractSize = 1m
            };
            var info = CreateAction(81, ConsGlobal.InstrumentType.Stock);
            info.GiveShareAmount = 10m;

            var applied = SwapEodPositionService.ApplyCorporateActionToPosition(
                position,
                info,
                100m,
                0m);

            Assert.IsTrue(applied);
            Assert.AreEqual(2000m, position.PosiQuantity);
            Assert.AreEqual(50m, position.PosiGrossPrice);
            Assert.AreEqual(100000m, position.PosiNotionalValue);
        }

        [TestMethod]
        public void Lifecycle_RegistrationIsIdempotent_ThenEffectiveUpdatesSameEvent()
        {
            var info = CreateAction(82, ConsGlobal.InstrumentType.Stock);
            var before = CreateEodPosition(15, info.UnderlyingCode, 1000m, 100m);
            var after = CreateEodPosition(15, info.UnderlyingCode, 2000m, 50m);
            var service = new EventRecordingService();
            var trade = new trade { id = 100 };

            service.Record(
                trade,
                new[] { before },
                Array.Empty<eod_swap_position>(),
                new[] { info },
                Array.Empty<ex_dividend_info>(),
                RecordDate);
            service.Record(
                trade,
                new[] { before },
                Array.Empty<eod_swap_position>(),
                new[] { info },
                Array.Empty<ex_dividend_info>(),
                RecordDate);

            Assert.AreEqual(1, service.Events.Count);
            Assert.AreEqual(1000m, before.PosiQuantity, "登记日不能改持仓数量");
            Assert.AreEqual(100m, before.PosiGrossPrice, "登记日不能改持仓价格");
            var pending = JsonConvert.DeserializeObject<CorporateActionEventData>(service.Events[0].EventData);
            Assert.IsFalse(pending.Applied);
            Assert.AreEqual(RecordDate, service.Events[0].ValueDate.Date);

            service.Record(
                trade,
                new[] { after },
                new[] { before },
                Array.Empty<ex_dividend_info>(),
                new[] { info },
                EffectiveDate);

            Assert.AreEqual(1, service.Events.Count, "生效日应更新原事件而非新增事件");
            Assert.AreEqual(1, service.UpdateCount);
            var applied = JsonConvert.DeserializeObject<CorporateActionEventData>(service.Events[0].EventData);
            Assert.IsTrue(applied.Applied);
            Assert.AreEqual(1000m, applied.BeforeQuantity);
            Assert.AreEqual(2000m, applied.AfterQuantity);
            Assert.AreEqual(50m, applied.AfterPrice);
            Assert.AreEqual(RecordDate, service.Events[0].ValueDate.Date);
        }

        private sealed class EventRecordingService : TestableSwapEodPositionService
        {
            public List<swap_event> Events { get; } = new List<swap_event>();
            public int UpdateCount { get; private set; }

            public EventRecordingService()
                : base(nameof(CorporateActionEventLifecycleTest))
            {
            }

            protected override List<swap_event> FindCorporateActionEvents(int swapTradeId)
            {
                return Events;
            }

            protected override swap_event AddSwapEvent(
                DateTime tradeDate,
                int swapTradeId,
                int eventType,
                string data,
                int clientCashId,
                bool save,
                string reason)
            {
                return new swap_event { id = Events.Count + 1 };
            }

            protected override void UpdateCorporateActionEventRecord(swap_event swapEvent)
            {
                UpdateCount++;
            }

            public void Record(
                trade trade,
                IReadOnlyCollection<eod_swap_position> current,
                IReadOnlyCollection<eod_swap_position> previous,
                IReadOnlyCollection<ex_dividend_info> registration,
                IReadOnlyCollection<ex_dividend_info> effective,
                DateTime settleDate)
            {
                RecordCorporateActionEvents(
                    trade,
                    current,
                    previous,
                    registration,
                    effective,
                    settleDate);
            }
        }

        private static ex_dividend_info CreateAction(int id, string instrumentType)
        {
            return new ex_dividend_info
            {
                id = id,
                UnderlyingCode = instrumentType == ConsGlobal.InstrumentType.Fund ? "FUND.TEST" : "STOCK.TEST",
                ExDividendDate = RecordDate,
                EffectiveDate = EffectiveDate,
                GiveShareAmount = 0m,
                GiveCashAmount = 0m,
                ValidStatus = true
            };
        }

        private static eod_swap_position CreateEodPosition(long positionId, string code, decimal quantity, decimal price)
        {
            return new eod_swap_position
            {
                PositionId = positionId,
                UnderlyingCode = code,
                UnderlyingInstrumentType = ConsGlobal.InstrumentType.Stock,
                PosiQuantity = quantity,
                PosiGrossPrice = price,
                PosiNotionalValue = quantity * price,
                PosiNetPrice = price,
                ContractSize = 1m,
                PosiDirection = 1,
                PositionType = 1
            };
        }
    }
}