using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using NT8.Core.Analytics;
using NT8.Core.Common.Models;
using NT8.Core.Intelligence;
using NT8.Core.Logging;

namespace NT8.Core.Tests.Analytics
{
    [TestClass]
    public class GradePerformanceAnalyzerTests
    {
        private GradePerformanceAnalyzer _target;

        [TestInitialize]
        public void TestInitialize()
        {
            _target = new GradePerformanceAnalyzer(new BasicLogger("GradePerformanceAnalyzerTests"));
        }

        [TestMethod] public void AnalyzeByGrade_ReturnsReport() { var r = _target.AnalyzeByGrade(Sample()); Assert.IsNotNull(r); }
        [TestMethod] public void AnalyzeByGrade_HasMetrics() { var r = _target.AnalyzeByGrade(Sample()); Assert.IsTrue(r.MetricsByGrade.Count > 0); }
        [TestMethod] public void CalculateGradeAccuracy_Bounded() { var a = _target.CalculateGradeAccuracy(TradeGrade.A, Sample()); Assert.IsTrue(a >= 0 && a <= 1); }
        [TestMethod] public void FindOptimalThreshold_ReturnsEnum() { var t = _target.FindOptimalThreshold(Sample()); Assert.IsTrue(Enum.IsDefined(typeof(TradeGrade), t)); }
        [TestMethod] public void GetMetricsByGrade_ReturnsAll() { var m = _target.GetMetricsByGrade(Sample()); Assert.IsTrue(m.Count >= 6); }
        [TestMethod] public void AnalyzeByGrade_Null_Throws() { Assert.ThrowsException<ArgumentNullException>(() => _target.AnalyzeByGrade(null)); }
        [TestMethod] public void Accuracy_Null_Throws() { Assert.ThrowsException<ArgumentNullException>(() => _target.CalculateGradeAccuracy(TradeGrade.B, null)); }
        [TestMethod] public void Threshold_Null_Throws() { Assert.ThrowsException<ArgumentNullException>(() => _target.FindOptimalThreshold(null)); }
        [TestMethod] public void Metrics_Null_Throws() { Assert.ThrowsException<ArgumentNullException>(() => _target.GetMetricsByGrade(null)); }
        [TestMethod] public void Accuracy_Empty_IsZero() { Assert.AreEqual(0.0, _target.CalculateGradeAccuracy(TradeGrade.A, new List<TradeRecord>()), 0.0001); }
        [TestMethod] public void SuggestedThreshold_NotDefaultOnData() { var r = _target.AnalyzeByGrade(Sample()); Assert.IsTrue((int)r.SuggestedThreshold >= 1); }
        [TestMethod] public void Metrics_ContainsA() { var m = _target.GetMetricsByGrade(Sample()); Assert.IsTrue(m.ContainsKey(TradeGrade.A)); }
        [TestMethod] public void Metrics_ContainsF() { var m = _target.GetMetricsByGrade(Sample()); Assert.IsTrue(m.ContainsKey(TradeGrade.F)); }
        [TestMethod] public void Analyze_GradeAccuracyPresent() { var r = _target.AnalyzeByGrade(Sample()); Assert.IsTrue(r.GradeAccuracy.ContainsKey(TradeGrade.B)); }
        [TestMethod] public void Analyze_ExpectancyComputed() { var r = _target.AnalyzeByGrade(Sample()); Assert.IsTrue(r.MetricsByGrade[TradeGrade.A].Expectancy >= -1000); }

        private static List<TradeRecord> Sample()
        {
            return new List<TradeRecord>
            {
                Trade(TradeGrade.A, 50), Trade(TradeGrade.A, -10),
                Trade(TradeGrade.B, 20), Trade(TradeGrade.C, -15),
                Trade(TradeGrade.D, -5), Trade(TradeGrade.F, -25)
            };
        }

        private static TradeRecord Trade(TradeGrade grade, double pnl)
        {
            var t = new TradeRecord();
            t.TradeId = Guid.NewGuid().ToString();
            t.Symbol = "ES";
            t.StrategyName = "S";
            t.EntryTime = DateTime.UtcNow;
            t.ExitTime = DateTime.UtcNow.AddMinutes(1);
            t.Side = OrderSide.Buy;
            t.Quantity = 1;
            t.EntryPrice = 100;
            t.ExitPrice = 101;
            t.RealizedPnL = pnl;
            t.Grade = grade;
            t.RiskMode = RiskMode.PCP;
            t.VolatilityRegime = VolatilityRegime.Normal;
            t.TrendRegime = TrendRegime.Range;
            t.StopTicks = 8;
            t.TargetTicks = 16;
            t.Duration = TimeSpan.FromMinutes(1);
            return t;
        }
    }
}