using FluentAssertions;
using Moq;
using Xunit;
using RobotNet10.NavigationTune.Execution;
using RobotNet10.NavigationTune.Shared.Interfaces;
using RobotNet10.NavigationTune.Shared.Models;
using RobotNet10.NavigationTune.Test.Helpers;
using RobotNet10.NavigationTune.Services;

namespace RobotNet10.NavigationTune.Test.Execution;

public class TuningNavigationTests
{
    private Mock<ITestExecutor> CreateMockTestExecutor()
    {
        var mock = new Mock<ITestExecutor>();
        return mock;
    }

    private Mock<IMetricsCalculator> CreateMockMetricsCalculator()
    {
        var mock = new Mock<IMetricsCalculator>();
        mock.Setup(m => m.CalculateMetrics(
            It.IsAny<List<TelemetryData>>(),
            It.IsAny<ReferencePath>()))
            .Returns(new TestMetrics
            {
                OverallScore = 0.85f,
                CrossTrackErrorRMS = 0.05f,
                HeadingErrorRMS = 0.02f
            });

        return mock;
    }

    [Fact]
    public void Constructor_WithDependencies_ShouldInitialize()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        // Act
        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        // Assert
        tuningNav.Should().NotBeNull();
        tuningNav.IsTestRunning.Should().BeFalse();
    }

    [Fact]
    public async Task ExecuteTestAsync_WithValidInputs_ShouldReturnResult()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        testExecutor.Setup(e => e.ExecuteAsync(
            It.IsAny<TestScenario>(),
            It.IsAny<NavigationParameterSet>(),
            It.IsAny<Action<TelemetryData>>(),
            It.IsAny<CancellationToken>()))
            .ReturnsAsync(new TestExecutionResult
            {
                TestRunId = Guid.NewGuid(),
                Status = TestStatus.Completed,
                TelemetryData = new List<TelemetryData>(),
                StartTime = DateTime.UtcNow
            });

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        var scenario = TestHelpers.CreateStraightLineScenario();
        var parameters = TestHelpers.CreateDefaultParameterSet();

        // Act
        var result = await tuningNav.ExecuteTestAsync(scenario, parameters);

        // Assert
        result.Should().NotBeNull();
        result.Status.Should().Be(TestStatus.Completed);
        testExecutor.Verify(e => e.ExecuteAsync(
            It.IsAny<TestScenario>(),
            It.IsAny<NavigationParameterSet>(),
            It.IsAny<Action<TelemetryData>>(),
            It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task ExecuteTestAsync_WhenAlreadyRunning_ShouldThrow()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        // Simulate long-running test
        testExecutor.Setup(e => e.ExecuteAsync(
            It.IsAny<TestScenario>(),
            It.IsAny<NavigationParameterSet>(),
            It.IsAny<Action<TelemetryData>>(),
            It.IsAny<CancellationToken>()))
            .Returns(async () =>
            {
                await Task.Delay(1000);
                return new TestExecutionResult { Status = TestStatus.Completed };
            });

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        var scenario = TestHelpers.CreateStraightLineScenario();
        var parameters = TestHelpers.CreateDefaultParameterSet();

        // Act
        var task1 = tuningNav.ExecuteTestAsync(scenario, parameters);
        await Task.Delay(50); // Let first test start

        // Assert
        await Assert.ThrowsAsync<InvalidOperationException>(async () =>
            await tuningNav.ExecuteTestAsync(scenario, parameters));

        // Cleanup
        tuningNav.Stop();
        await task1;
    }

    [Fact]
    public void GetProgress_ShouldDelegateToTestExecutor()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        testExecutor.Setup(e => e.GetProgress())
            .Returns(new TestProgress
            {
                ProgressPercent = 0.5,
                DistanceTraveled = 5.0
            });

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        // Act
        var progress = tuningNav.GetProgress();

        // Assert
        progress.Should().NotBeNull();
        progress.ProgressPercent.Should().Be(0.5);
        testExecutor.Verify(e => e.GetProgress(), Times.Once);
    }

    [Fact]
    public void Pause_ShouldDelegateToTestExecutor()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        // Act
        tuningNav.Pause();

        // Assert
        testExecutor.Verify(e => e.Pause(), Times.Once);
    }

    [Fact]
    public void Resume_ShouldDelegateToTestExecutor()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        // Act
        tuningNav.Resume();

        // Assert
        testExecutor.Verify(e => e.Resume(), Times.Once);
    }

    [Fact]
    public void Stop_ShouldDelegateToTestExecutor()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        // Act
        tuningNav.Stop();

        // Assert
        testExecutor.Verify(e => e.Stop(), Times.Once);
    }

    [Fact]
    public void EmergencyStop_ShouldDelegateToTestExecutor()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        // Act
        tuningNav.EmergencyStop();

        // Assert
        testExecutor.Verify(e => e.EmergencyStop(), Times.Once);
    }

    [Fact]
    public async Task ExecuteTestAsync_ShouldInvokeTelemetryUpdateEvent()
    {
        // Arrange
        var testExecutor = CreateMockTestExecutor();
        var metricsCalculator = CreateMockMetricsCalculator();

        var telemetryReceived = false;
        var tuningNav = new TuningNavigation(
            testExecutor.Object,
            metricsCalculator.Object);

        tuningNav.OnTelemetryUpdate += (telemetry) => telemetryReceived = true;

        testExecutor.Setup(e => e.ExecuteAsync(
            It.IsAny<TestScenario>(),
            It.IsAny<NavigationParameterSet>(),
            It.IsAny<Action<TelemetryData>>(),
            It.IsAny<CancellationToken>()))
            .Callback<TestScenario, NavigationParameterSet, Action<TelemetryData>?, CancellationToken>(
                (s, p, callback, ct) =>
                {
                    callback?.Invoke(TestHelpers.CreateTelemetryData());
                })
            .ReturnsAsync(new TestExecutionResult
            {
                Status = TestStatus.Completed,
                TelemetryData = new List<TelemetryData>()
            });

        var scenario = TestHelpers.CreateStraightLineScenario();
        var parameters = TestHelpers.CreateDefaultParameterSet();

        // Act
        await tuningNav.ExecuteTestAsync(scenario, parameters);

        // Assert
        telemetryReceived.Should().BeTrue();
    }
}