using System;
using System.Collections.Generic;
using System.Linq;
using Moq;
using Prism.Events;
using XP.Common.Logging.Interfaces;
using XP.Hardware.MotionControl.Abstractions;
using XP.Hardware.MotionControl.Abstractions.Enums;
using Xunit;
using XplorePlane.Models;
using XplorePlane.Services.Cnc;
using XplorePlane.Services.Cnc.Matrix;
using XplorePlane.Services.Dialogs;
using XplorePlane.ViewModels.Cnc;

namespace XplorePlane.Tests.ViewModels
{
    public class MatrixEditorViewModelTests
    {
        [Fact]
        public void Constructor_CreatesTwoByTwoLayoutByDefault()
        {
            var fixture = CreateFixture();

            Assert.Equal(2, fixture.ViewModel.Rows);
            Assert.Equal(2, fixture.ViewModel.Columns);
            Assert.Equal(4, fixture.ViewModel.Cells.Count);
            Assert.Equal(new[] { 1, 4 }, fixture.ViewModel.TeachPoints.Select(point => point.Position));
        }

        [Fact]
        public void RecordCurrentPosition_RefreshesMotionAxesAndRecordsLatestCoordinates()
        {
            var fixture = CreateFixture(stageXmm: 12.3456, stageYmm: -3.2546);
            var teachPoint = fixture.ViewModel.CurrentTeachPoint;

            fixture.ViewModel.RecordCurrentPositionCommand.Execute();

            fixture.StageX.Verify(axis => axis.UpdateStatus(), Times.Once);
            fixture.StageY.Verify(axis => axis.UpdateStatus(), Times.Once);
            Assert.True(teachPoint.HasRecorded);
            Assert.Equal(12.346, teachPoint.RecordedX);
            Assert.Equal(-3.255, teachPoint.RecordedY);
            Assert.Equal("X:12.346 Y:-3.255 mm", teachPoint.CoordinateLabel);
        }

        [Fact]
        public void AutoGenerate_UsesRecordedMillimeterCoordinatesWithoutUnitScaling()
        {
            var fixture = CreateFixture(stageXmm: 10.1234, stageYmm: 20.1234);

            fixture.ViewModel.RecordCurrentPositionCommand.Execute();
            fixture.StageX.SetupGet(axis => axis.ActualPosition).Returns(11.2345);
            fixture.StageY.SetupGet(axis => axis.ActualPosition).Returns(25.6789);
            fixture.ViewModel.RecordCurrentPositionCommand.Execute();

            fixture.ViewModel.AutoGenerateCommand.Execute();

            var topRight = fixture.ViewModel.Cells[1];
            var bottomLeft = fixture.ViewModel.Cells[2];
            var bottomRight = fixture.ViewModel.Cells[3];
            Assert.Equal(1.112, topRight.OffsetX);
            Assert.Equal(0, topRight.OffsetY);
            Assert.Equal(0, bottomLeft.OffsetX);
            Assert.Equal(5.556, bottomLeft.OffsetY);
            Assert.Equal(1.112, bottomRight.OffsetX);
            Assert.Equal(5.556, bottomRight.OffsetY);
            Assert.Equal("X:10.123 Y:25.679", bottomLeft.CoordinateLabel);
            Assert.Equal("X:11.235 Y:25.679", bottomRight.CoordinateLabel);
        }

        [Fact]
        public void CellCommands_RecordAdditionalPositionAndToggleEnabledState()
        {
            var fixture = CreateFixture(stageXmm: 7.1234, stageYmm: 8.5678);
            var targetCell = fixture.ViewModel.Cells[1];

            fixture.ViewModel.RecordCellPositionCommand.Execute(targetCell);

            var additionalPoint = Assert.Single(
                fixture.ViewModel.TeachPoints,
                point => point.Position == 2);
            Assert.True(additionalPoint.IsTaught);
            Assert.Equal(7.123, additionalPoint.RecordedX);
            Assert.Equal(8.568, additionalPoint.RecordedY);
            Assert.Equal(MatrixCellTeachState.Taught, fixture.ViewModel.Cells[1].TeachState);

            fixture.ViewModel.ToggleCellCommand.Execute(fixture.ViewModel.Cells[1]);

            Assert.False(fixture.ViewModel.Cells[1].IsEnabled);
        }

        private static Fixture CreateFixture(double stageXmm = 0, double stageYmm = 0)
        {
            var matrixService = new Mock<IMatrixService>();
            matrixService
                .Setup(service => service.CreateLayout(
                    It.IsAny<int>(), It.IsAny<int>(), It.IsAny<double>(), It.IsAny<double>()))
                .Returns<int, int, double, double>(CreateLayout);
            matrixService
                .Setup(service => service.ToggleCellEnabled(
                    It.IsAny<MatrixLayout>(), It.IsAny<int>(), It.IsAny<int>()))
                .Returns<MatrixLayout, int, int>((layout, row, column) =>
                {
                    var cells = layout.Cells
                        .Select(cell => cell.Row == row && cell.Column == column
                            ? cell with { IsEnabled = !cell.IsEnabled }
                            : cell)
                        .ToList()
                        .AsReadOnly();
                    return layout with { Cells = cells };
                });

            var stageX = new Mock<ILinearAxis>();
            stageX.SetupGet(axis => axis.ActualPosition).Returns(stageXmm);
            var stageY = new Mock<ILinearAxis>();
            stageY.SetupGet(axis => axis.ActualPosition).Returns(stageYmm);

            var motionSystem = new Mock<IMotionSystem>();
            motionSystem.Setup(system => system.GetLinearAxis(AxisId.StageX)).Returns(stageX.Object);
            motionSystem.Setup(system => system.GetLinearAxis(AxisId.StageY)).Returns(stageY.Object);

            var logger = new Mock<ILoggerService>();
            logger.Setup(service => service.ForModule<MatrixEditorViewModel>()).Returns(logger.Object);

            var viewModel = new MatrixEditorViewModel(
                matrixService.Object,
                Mock.Of<ICncProgramService>(),
                Mock.Of<IMatrixExecutionCoordinator>(),
                motionSystem.Object,
                Mock.Of<IEventAggregator>(),
                logger.Object,
                Mock.Of<IApplicationDialogService>());

            return new Fixture(viewModel, stageX, stageY);
        }

        private static MatrixLayout CreateLayout(int rows, int columns, double rowSpacing, double columnSpacing)
        {
            var cells = new List<MatrixCell>();
            for (var row = 0; row < rows; row++)
            {
                for (var column = 0; column < columns; column++)
                {
                    cells.Add(new MatrixCell(
                        row,
                        column,
                        column * columnSpacing,
                        row * rowSpacing,
                        true,
                        MatrixCellStatus.NotExecuted,
                        null));
                }
            }

            return new MatrixLayout(
                Guid.NewGuid(), rows, columns, rowSpacing, columnSpacing,
                0, 0, string.Empty, cells.AsReadOnly());
        }

        private sealed record Fixture(
            MatrixEditorViewModel ViewModel,
            Mock<ILinearAxis> StageX,
            Mock<ILinearAxis> StageY);
    }
}