using Moq;
using Prism.Events;
using System;
using System.Windows;
using XP.Common.Logging.Interfaces;
using XP.Hardware.MotionControl.Abstractions;
using XP.Hardware.MotionControl.Abstractions.Enums;
using XP.Hardware.MotionControl.Abstractions.Events;
using XP.Hardware.MotionControl.Services;
using XP.Hardware.RaySource.Services;
using XplorePlane.Models;
using XplorePlane.Services.AppState;
using Xunit;
using Xunit.Abstractions;

namespace XplorePlane.Tests.Services
{
    /// <summary>
    /// AppStateService unit tests.
    /// Verifies default values, null guards, dispose behavior, and hardware-driven motion-state sync.
    /// </summary>
    public class AppStateServiceTests : IDisposable
    {
        private readonly AppStateService _service;
        private readonly Mock<IRaySourceService> _mockRaySource;
        private readonly Mock<IMotionSystem> _mockMotionSystem;
        private readonly Mock<IMotionControlService> _mockMotionControlService;
        private readonly Mock<ILinearAxis> _mockStageX;
        private readonly Mock<ILinearAxis> _mockStageY;
        private readonly Mock<ILinearAxis> _mockSourceZ;
        private readonly Mock<ILinearAxis> _mockDetectorZ;
        private readonly Mock<IRotaryAxis> _mockDetectorSwing;
        private readonly Mock<IRotaryAxis> _mockStageRotation;
        private readonly Mock<IRotaryAxis> _mockFixtureRotation;
        private readonly Mock<ILoggerService> _mockLogger;
        private readonly EventAggregator _eventAggregator;
        private readonly ITestOutputHelper _output;

        public AppStateServiceTests(ITestOutputHelper output)
        {
            _output = output;

            if (Application.Current == null)
            {
                new Application();
            }

            _mockRaySource = new Mock<IRaySourceService>();
            _mockMotionSystem = new Mock<IMotionSystem>();
            _mockMotionControlService = new Mock<IMotionControlService>();
            _mockStageX = CreateLinearAxis(AxisId.StageX, 0);
            _mockStageY = CreateLinearAxis(AxisId.StageY, 0);
            _mockSourceZ = CreateLinearAxis(AxisId.SourceZ, 0);
            _mockDetectorZ = CreateLinearAxis(AxisId.DetectorZ, 0);
            _mockDetectorSwing = CreateRotaryAxis(RotaryAxisId.DetectorSwing, 0);
            _mockStageRotation = CreateRotaryAxis(RotaryAxisId.StageRotation, 0);
            _mockFixtureRotation = CreateRotaryAxis(RotaryAxisId.FixtureRotation, 0);
            _mockLogger = new Mock<ILoggerService>();
            _eventAggregator = new EventAggregator();

            _mockMotionSystem.Setup(x => x.GetLinearAxis(AxisId.StageX)).Returns(_mockStageX.Object);
            _mockMotionSystem.Setup(x => x.GetLinearAxis(AxisId.StageY)).Returns(_mockStageY.Object);
            _mockMotionSystem.Setup(x => x.GetLinearAxis(AxisId.SourceZ)).Returns(_mockSourceZ.Object);
            _mockMotionSystem.Setup(x => x.GetLinearAxis(AxisId.DetectorZ)).Returns(_mockDetectorZ.Object);
            _mockMotionSystem.Setup(x => x.GetRotaryAxis(RotaryAxisId.DetectorSwing)).Returns(_mockDetectorSwing.Object);
            _mockMotionSystem.Setup(x => x.GetRotaryAxis(RotaryAxisId.StageRotation)).Returns(_mockStageRotation.Object);
            _mockMotionSystem.Setup(x => x.GetRotaryAxis(RotaryAxisId.FixtureRotation)).Returns(_mockFixtureRotation.Object);

            _mockMotionControlService
                .Setup(x => x.GetCurrentGeometry())
                .Returns((0d, 0d, 1d));

            _mockLogger.Setup(l => l.ForModule<AppStateService>()).Returns(_mockLogger.Object);

            _service = new AppStateService(
                _mockRaySource.Object,
                _mockMotionSystem.Object,
                _mockMotionControlService.Object,
                _eventAggregator,
                _mockLogger.Object);
        }

        public void Dispose()
        {
            _service.Dispose();
        }

        [Fact]
        public void DefaultState_MotionState_IsHardwareSnapshot()
        {
            Assert.Equal(0, _service.MotionState.StageX);
            Assert.Equal(0, _service.MotionState.StageY);
            Assert.Equal(0, _service.MotionState.SourceZ);
            Assert.Equal(0, _service.MotionState.DetectorZ);
            Assert.Equal(0, _service.MotionState.DetectorSwing);
            Assert.Equal(0, _service.MotionState.FDD);
        }

        [Fact]
        public void DefaultState_RaySourceState_IsDefault()
        {
            _output.WriteLine($"RaySourceState == RaySourceState.Default: {ReferenceEquals(RaySourceState.Default, _service.RaySourceState)}");
            Assert.Same(RaySourceState.Default, _service.RaySourceState);
        }

        [Fact]
        public void DefaultState_SystemState_IsDefault()
        {
            _output.WriteLine($"SystemState == SystemState.Default: {ReferenceEquals(SystemState.Default, _service.SystemState)}");
            Assert.Same(SystemState.Default, _service.SystemState);
        }

        [Fact]
        public void DefaultState_CalibrationMatrix_IsNull()
        {
            _output.WriteLine($"CalibrationMatrix: {_service.CalibrationMatrix?.ToString() ?? "null"}");
            Assert.Null(_service.CalibrationMatrix);
        }

        [Fact]
        public void UpdateMotionState_NullArgument_ThrowsArgumentNullException()
        {
            var ex = Assert.Throws<ArgumentNullException>(() => _service.UpdateMotionState(null!));
            _output.WriteLine($"UpdateMotionState(null) threw: {ex.GetType().Name}, Param={ex.ParamName}");
        }

        [Fact]
        public void UpdateRaySourceState_NullArgument_ThrowsArgumentNullException()
        {
            var ex = Assert.Throws<ArgumentNullException>(() => _service.UpdateRaySourceState(null!));
            _output.WriteLine($"UpdateRaySourceState(null) threw: {ex.GetType().Name}, Param={ex.ParamName}");
        }

        [Fact]
        public void UpdateDetectorState_NullArgument_ThrowsArgumentNullException()
        {
            var ex = Assert.Throws<ArgumentNullException>(() => _service.UpdateDetectorState(null!));
            _output.WriteLine($"UpdateDetectorState(null) threw: {ex.GetType().Name}, Param={ex.ParamName}");
        }

        [Fact]
        public void UpdateSystemState_NullArgument_ThrowsArgumentNullException()
        {
            var ex = Assert.Throws<ArgumentNullException>(() => _service.UpdateSystemState(null!));
            _output.WriteLine($"UpdateSystemState(null) threw: {ex.GetType().Name}, Param={ex.ParamName}");
        }

        [Fact]
        public void Dispose_ThenUpdate_IsIgnored()
        {
            var originalState = _service.MotionState;
            _service.Dispose();

            var newState = new MotionState(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
            _service.UpdateMotionState(newState);

            Assert.Same(originalState, _service.MotionState);
        }

        [Fact]
        public void RequestLinkedView_NoCalibrationMatrix_SetsErrorState()
        {
            Assert.Null(_service.CalibrationMatrix);

            _service.RequestLinkedView(100.0, 200.0);

            Assert.True(_service.SystemState.HasError);
            Assert.NotEmpty(_service.SystemState.ErrorMessage);
        }

        [Fact]
        public void GeometryUpdatedEvent_RefreshesMotionStateFromHardware()
        {
            _mockStageX.SetupGet(x => x.ActualPosition).Returns(12.5);
            _mockStageY.SetupGet(x => x.ActualPosition).Returns(34.5);
            _mockSourceZ.SetupGet(x => x.ActualPosition).Returns(56.5);
            _mockDetectorZ.SetupGet(x => x.ActualPosition).Returns(78.5);
            _mockDetectorSwing.SetupGet(x => x.ActualAngle).Returns(9.5);

            _eventAggregator.GetEvent<GeometryUpdatedEvent>()
                .Publish(new GeometryData(100, 222.2, 2.22));

            Assert.Equal(12.5, _service.MotionState.StageX);
            Assert.Equal(34.5, _service.MotionState.StageY);
            Assert.Equal(56.5, _service.MotionState.SourceZ);
            Assert.Equal(78.5, _service.MotionState.DetectorZ);
            Assert.Equal(9.5, _service.MotionState.DetectorSwing);
            Assert.Equal(222.2, _service.MotionState.FDD);
        }

        private static Mock<ILinearAxis> CreateLinearAxis(AxisId axisId, double position)
        {
            var axis = new Mock<ILinearAxis>();
            axis.SetupGet(x => x.Id).Returns(axisId);
            axis.SetupGet(x => x.ActualPosition).Returns(position);
            axis.SetupGet(x => x.Status).Returns(AxisStatus.Idle);
            return axis;
        }

        private static Mock<IRotaryAxis> CreateRotaryAxis(RotaryAxisId axisId, double angle)
        {
            var axis = new Mock<IRotaryAxis>();
            axis.SetupGet(x => x.Id).Returns(axisId);
            axis.SetupGet(x => x.ActualAngle).Returns(angle);
            axis.SetupGet(x => x.Status).Returns(AxisStatus.Idle);
            axis.SetupGet(x => x.Enabled).Returns(true);
            return axis;
        }
    }
}