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

namespace YLErp.Modules.SwapModule
{
    /// <summary>
    /// SwapDealService 的可测试化子类（共享 stub）。
    /// 继承 SwapDealService，override seam 把 DB/事务/外部服务替换为内存收集器。
    /// 被 SwapUnwindScenarioTest / SwapIncomeScenarioTest 共用，避免重复。
    /// </summary>
    public class TestableSwapDealService : SwapDealService
    {
        private readonly trade _trade;
        private readonly Dictionary<int, swap_event> _swapEvents;
        private readonly Dictionary<long, List<swap_flow_event>> _flowEventsByEventId;

        /// <summary>捕获 AddClientCash 的每次调用（金额, 操作, 日期）</summary>
        public List<(double amount, string action, DateTime date)> ClientCashCalls { get; } = new();

        /// <summary>捕获 SaveSwapDeal 的每次调用（unwindData, eventType, clientCashId）</summary>
        public List<(UnwindData data, int eventType, int clientCashId)> SaveSwapDealCalls { get; } = new();

        public int SaveAllChangesCount;
        public int CloseReCheckCallCount;

        /// <summary>Fund 盤中基线测试输入；生产服务通过数据库查询同名 seam。</summary>
        public swap_position RealtimeFloatPosition { get; set; }
        public eod_swap_position LatestFundEodPosition { get; set; }
        public bool HasCompletedFlowAfterLatestFundEod { get; set; }
        public List<swap_position> ActiveSwapPositions { get; set; } = new();
        public List<ex_dividend_info> ExDividendInfos { get; } = new();

        public TestableSwapDealService(trade td,
            Dictionary<int, swap_event> swapEvents = null,
            Dictionary<long, List<swap_flow_event>> flowEventsByEventId = null)
            : base(new OptUserInfo(0, nameof(TestableSwapDealService), OptUserFrom.UnitTest))
        {
            _trade = td;
            _swapEvents = swapEvents ?? new Dictionary<int, swap_event>();
            _flowEventsByEventId = flowEventsByEventId ?? new Dictionary<long, List<swap_flow_event>>();
        }

        protected override trade FindTrade(int tradeId) => tradeId == _trade.id ? _trade : null;

        protected override List<swap_position> FindActiveSwapPositions(int tradeId)
            => ActiveSwapPositions;

        protected override swap_position FindRealtimeFloatPosition(UnwindData unwindData)
            => RealtimeFloatPosition;

        protected override eod_swap_position FindLatestFundEodPosition(int tradeId, long positionId, DateTime valueDate)
            => LatestFundEodPosition;

        protected override bool HasCompletedFlowAfterFundEod(int tradeId, long positionId, DateTime eodDate, DateTime valueDate)
            => HasCompletedFlowAfterLatestFundEod;

        protected override ex_dividend_info FindFundCorporateAction(string underlyingCode, DateTime valueDate)
            => ExDividendInfos.FirstOrDefault(x => x.ValidStatus
                && x.UnderlyingCode == underlyingCode
                && x.EffectiveDate == valueDate.Date);

        protected override List<ex_dividend_info> FindFundCorporateActions(
            string underlyingCode,
            DateTime eodDate,
            DateTime valueDate)
            => ExDividendInfos
                .Where(x => x.ValidStatus
                    && x.UnderlyingCode == underlyingCode
                    && x.EffectiveDate.HasValue
                    && x.EffectiveDate.Value.Date > eodDate.Date
                    && x.EffectiveDate.Value.Date <= valueDate.Date)
                .OrderBy(x => x.EffectiveDate)
                .ThenBy(x => x.id)
                .ToList();

        protected override decimal GetFundCorporateActionClosePrice(
            ex_dividend_info dividendInfo,
            decimal fallbackPrice)
            => fallbackPrice;

        public bool RestoreEffectiveFundPositionForTest(UnwindData unwindData, DateTime valueDate)
            => TryRestoreAndValidateUnwindData(unwindData, valueDate);

        protected override int AddClientCash(trade td, double amount, string action, DateTime valueDate)
        {
            ClientCashCalls.Add((amount, action, valueDate));
            return ClientCashCalls.Count; // 返回自增 id
        }

        // 整体 override SaveSwapDeal：收集入参，规避内部 new SwapEventService 连库
        protected override long SaveSwapDeal(UnwindData unwindData, int eventType, int clientCashId, string eventResason = "", bool approve = false)
        {
            SaveSwapDealCalls.Add((unwindData, eventType, clientCashId));
            return SaveSwapDealCalls.Count; // 返回自增 eventId
        }

        // ApproveSwapTrade 查待审核事件：从内存字典取（key=eventType）
        protected override swap_event FindSwapEvent(int tradeId, int eventType)
        {
            return _swapEvents.TryGetValue(eventType, out var evt) ? evt : null;
        }

        // ApproveSwapTrade 查事件关联流水：从内存字典取
        protected override List<swap_flow_event> FindFlowEventsByEventId(long eventId)
        {
            return _flowEventsByEventId.TryGetValue(eventId, out var list) ? list : new List<swap_flow_event>();
        }

        // ApplySwapTrade 的前置校验：计数，不实际执行
        protected override void CloseReCheckSetTrade(int swapTradeId, bool isSwap, bool needCheck)
        {
            CloseReCheckCallCount++;
        }

        protected override void SaveAllChanges() { SaveAllChangesCount++; }
        protected override void ExecuteInTransaction(Action action) => action(); // 不包事务，直接执行
        protected override void CallSaveSwapTradeClientCash(trade td, DateTime valueDate) { } // 空操作
        protected override void TriggerRealtimeSwapPosition() { } // 空操作
    }

    /// <summary>
    /// SwapDealService 测试的共享工厂方法（TestableSwapDealService + UnwindData 构造）。
    /// 被 SwapUnwindScenarioTest / SwapIncomeScenarioTest 共用。
    /// </summary>
    public static class SwapDealTestFactory
    {
        public const int SwapTradeId = 7700;
        public static readonly DateTime ValueDate = new(2026, 6, 15);
        public static readonly DateTime UnwindDate = new(2026, 6, 16);

        public static trade CreateTrade()
        {
            return new trade
            {
                id = SwapTradeId, TradeNumber = "UT-SD-001", ClientId = 888888,
                TradeType = "收益互换", StartDate = new DateTime(2026, 1, 5),
                ExerciseDate = new DateTime(2026, 6, 14), // 已到期边界（SwapIncome 判断用）
                TradeStatus = "确认成交", ValidState = "Valid",
                Notional = 1000000, StockEqvNotional = 1000000, TradeAmount = 10000
            };
        }

        /// <summary>构造结息/平仓的 UnwindData（金额由前端算好传入，后端直接用）</summary>
        public static UnwindData CreateUnwindData(decimal swapRealizedPnL, decimal swapMarginRebatePnl = 0m,
            decimal swapMarginAmount = 0m, int closeMethod = 0, decimal closePercent = 0m,
            decimal closeQty = 0m, decimal closeNotionalValue = 0m, decimal positionQty = 0m)
        {
            return new UnwindData
            {
                SwapTradeId = SwapTradeId,
                SwapRealizedPnL = swapRealizedPnL,
                SwapMarginRebatePnl = swapMarginRebatePnl,
                SwapMarginAmount = swapMarginAmount,
                SwapCloseAmount = swapRealizedPnL,
                CloseMethod = closeMethod,
                ClosePercent = closePercent,
                CloseQty = closeQty,
                CloseNotionalValue = closeNotionalValue,
                PositionQty = positionQty,
                ValueDate = ValueDate,
                UnwindDate = UnwindDate,
                StartDate = new DateTime(2026, 1, 5)
            };
        }

        public static void AssertDecimalEqual(decimal expected, decimal actual, decimal tolerance, string message = "")
        {
            Assert.IsTrue(Math.Abs(expected - actual) <= tolerance,
                $"{message} Expected: {expected}, Actual: {actual}, Diff: {expected - actual}");
        }
    }
}