using Microsoft.VisualStudio.TestTools.UnitTesting;
using NT8.Adapters.NinjaTrader;
using NT8.Core.Common.Models;
using System;
using System.Collections.Generic;
using System.Diagnostics;

namespace NT8.Integration.Tests
{
    /// <summary>
    /// Integration tests for NT8 data conversion layer.
    /// </summary>
    [TestClass]
    public class NT8DataConverterIntegrationTests
    {
        [TestMethod]
        public void ConvertBar_ValidInput_ReturnsExpectedBarData()
        {
            // Arrange
            var time = new DateTime(2026, 2, 15, 14, 30, 0, DateTimeKind.Utc);

            // Act
            var result = NT8DataConverter.ConvertBar("ES 03-26", time, 6000.25, 6010.50, 5998.75, 6005.00, 12000, 5);

            // Assert
            Assert.AreEqual("ES 03-26", result.Symbol);
            Assert.AreEqual(time, result.Time);
            Assert.AreEqual(6000.25, result.Open);
            Assert.AreEqual(6010.50, result.High);
            Assert.AreEqual(5998.75, result.Low);
            Assert.AreEqual(6005.00, result.Close);
            Assert.AreEqual(12000, result.Volume);
            Assert.AreEqual(TimeSpan.FromMinutes(5), result.BarSize);
        }

        [TestMethod]
        public void ConvertBar_InvalidBarSize_ThrowsArgumentException()
        {
            // Act & Assert
            Assert.ThrowsException<ArgumentException>(() =>
                NT8DataConverter.ConvertBar("NQ 03-26", DateTime.UtcNow, 1, 2, 0.5, 1.5, 10, 0));
        }

        [TestMethod]
        public void ConvertBar_EmptySymbol_ThrowsArgumentException()
        {
            // Act & Assert
            Assert.ThrowsException<ArgumentException>(() =>
                NT8DataConverter.ConvertBar("", DateTime.UtcNow, 1, 2, 0.5, 1.5, 10, 5));
        }

        [TestMethod]
        public void ConvertAccount_ValidInput_ReturnsExpectedAccountInfo()
        {
            // Arrange
            var lastUpdate = new DateTime(2026, 2, 15, 14, 45, 0, DateTimeKind.Utc);

            // Act
            var account = NT8DataConverter.ConvertAccount(100000.0, 95000.0, 1250.5, 5000.0, lastUpdate);

            // Assert
            Assert.AreEqual(100000.0, account.Equity);
            Assert.AreEqual(95000.0, account.BuyingPower);
            Assert.AreEqual(1250.5, account.DailyPnL);
            Assert.AreEqual(5000.0, account.MaxDrawdown);
            Assert.AreEqual(lastUpdate, account.LastUpdate);
        }

        [TestMethod]
        public void ConvertPosition_ValidInput_ReturnsExpectedPosition()
        {
            // Arrange
            var lastUpdate = new DateTime(2026, 2, 15, 15, 0, 0, DateTimeKind.Utc);

            // Act
            var position = NT8DataConverter.ConvertPosition("GC 04-26", 3, 2105.2, 180.0, -20.0, lastUpdate);

            // Assert
            Assert.AreEqual("GC 04-26", position.Symbol);
            Assert.AreEqual(3, position.Quantity);
            Assert.AreEqual(2105.2, position.AveragePrice);
            Assert.AreEqual(180.0, position.UnrealizedPnL);
            Assert.AreEqual(-20.0, position.RealizedPnL);
            Assert.AreEqual(lastUpdate, position.LastUpdate);
        }

        [TestMethod]
        public void ConvertPosition_EmptySymbol_ThrowsArgumentException()
        {
            // Act & Assert
            Assert.ThrowsException<ArgumentException>(() =>
                NT8DataConverter.ConvertPosition("", 1, 100.0, 0.0, 0.0, DateTime.UtcNow));
        }

        [TestMethod]
        public void ConvertSession_EndBeforeStart_ThrowsArgumentException()
        {
            // Arrange
            var start = new DateTime(2026, 2, 15, 16, 0, 0, DateTimeKind.Utc);
            var end = new DateTime(2026, 2, 15, 9, 30, 0, DateTimeKind.Utc);

            // Act & Assert
            Assert.ThrowsException<ArgumentException>(() =>
                NT8DataConverter.ConvertSession(start, end, true, "RTH"));
        }

        [TestMethod]
        public void ConvertContext_NullCustomData_CreatesEmptyDictionary()
        {
            // Arrange
            var position = new Position("MES 03-26", 1, 5000.0, 15.0, 10.0, DateTime.UtcNow);
            var account = new AccountInfo(50000.0, 50000.0, 200.0, 1000.0, DateTime.UtcNow);
            var session = new MarketSession(DateTime.Today.AddHours(9.5), DateTime.Today.AddHours(16), true, "RTH");

            // Act
            var context = NT8DataConverter.ConvertContext("MES 03-26", DateTime.UtcNow, position, account, session, null);

            // Assert
            Assert.IsNotNull(context.CustomData);
            Assert.AreEqual(0, context.CustomData.Count);
        }

        [TestMethod]
        public void ConvertContext_WithCustomData_CopiesDictionaryValues()
        {
            // Arrange
            var position = new Position("CL 04-26", 2, 75.25, 50.0, -20.0, DateTime.UtcNow);
            var account = new AccountInfo(75000.0, 74000.0, -150.0, 1200.0, DateTime.UtcNow);
            var session = new MarketSession(DateTime.Today.AddHours(18), DateTime.Today.AddDays(1).AddHours(17), false, "ETH");
            var input = new Dictionary<string, object>();
            input.Add("spread", 1.25);
            input.Add("source", "sim");

            // Act
            var context = NT8DataConverter.ConvertContext("CL 04-26", DateTime.UtcNow, position, account, session, input);

            // Assert
            Assert.AreEqual("CL 04-26", context.Symbol);
            Assert.AreEqual(2, context.CustomData.Count);
            Assert.AreEqual(1.25, (double)context.CustomData["spread"]);
            Assert.AreEqual("sim", (string)context.CustomData["source"]);

            // Validate copied dictionary (not same reference)
            input.Add("newKey", 99);
            Assert.AreEqual(2, context.CustomData.Count);
        }

        [TestMethod]
        public void ConvertContext_NullPosition_ThrowsArgumentNullException()
        {
            // Arrange
            var account = new AccountInfo(50000.0, 50000.0, 200.0, 1000.0, DateTime.UtcNow);
            var session = new MarketSession(DateTime.Today.AddHours(9.5), DateTime.Today.AddHours(16), true, "RTH");

            // Act & Assert
            Assert.ThrowsException<ArgumentNullException>(() =>
                NT8DataConverter.ConvertContext("MES 03-26", DateTime.UtcNow, null, account, session, null));
        }

        [TestMethod]
        public void ConvertContext_NullAccount_ThrowsArgumentNullException()
        {
            // Arrange
            var position = new Position("MES 03-26", 1, 5000.0, 15.0, 10.0, DateTime.UtcNow);
            var session = new MarketSession(DateTime.Today.AddHours(9.5), DateTime.Today.AddHours(16), true, "RTH");

            // Act & Assert
            Assert.ThrowsException<ArgumentNullException>(() =>
                NT8DataConverter.ConvertContext("MES 03-26", DateTime.UtcNow, position, null, session, null));
        }

        [TestMethod]
        public void ConvertContext_NullSession_ThrowsArgumentNullException()
        {
            // Arrange
            var position = new Position("MES 03-26", 1, 5000.0, 15.0, 10.0, DateTime.UtcNow);
            var account = new AccountInfo(50000.0, 50000.0, 200.0, 1000.0, DateTime.UtcNow);

            // Act & Assert
            Assert.ThrowsException<ArgumentNullException>(() =>
                NT8DataConverter.ConvertContext("MES 03-26", DateTime.UtcNow, position, account, null, null));
        }

        [TestMethod]
        public void ConvertSession_EmptyName_ThrowsArgumentException()
        {
            // Arrange
            var start = new DateTime(2026, 2, 15, 9, 30, 0, DateTimeKind.Utc);
            var end = new DateTime(2026, 2, 15, 16, 0, 0, DateTimeKind.Utc);

            // Act & Assert
            Assert.ThrowsException<ArgumentException>(() =>
                NT8DataConverter.ConvertSession(start, end, true, ""));
        }

        [TestMethod]
        public void ConvertBar_Performance_AverageUnderOneMillisecond()
        {
            // Arrange
            var iterations = 5000;
            var startedAt = DateTime.UtcNow;

            // Act
            var stopwatch = Stopwatch.StartNew();
            for (var i = 0; i < iterations; i++)
            {
                NT8DataConverter.ConvertBar(
                    "ES 03-26",
                    startedAt.AddMinutes(i),
                    6000.25,
                    6010.50,
                    5998.75,
                    6005.00,
                    12000,
                    5);
            }
            stopwatch.Stop();

            // Assert
            var averageMs = stopwatch.Elapsed.TotalMilliseconds / iterations;
            Assert.IsTrue(averageMs < 1.0, string.Format("Expected average conversion under 1.0 ms but was {0:F6} ms", averageMs));
        }
    }
}