using System.Reflection;
using System.Text.RegularExpressions;
using ACadSharp.IO;
using OpenNest.Bending;
using OpenNest.IO.Bending;

namespace OpenNest.Tests.Bending;

public class SolidWorksBendDetectorTests
{
    [Theory]
    [InlineData("BendNoteRegex")]
    [InlineData("MTextFormatRegex")]
    [InlineData("UnicodeEscapeRegex")]
    [InlineData("WhitespaceRegex")]
    public void DetectorRegex_HasExplicitTimeout(string fieldName)
    {
        var field = typeof(SolidWorksBendDetector).GetField(fieldName,
            BindingFlags.Static | BindingFlags.NonPublic);
        Assert.NotNull(field);
        var regex = Assert.IsType<Regex>(field.GetValue(null));
        Assert.Equal(TimeSpan.FromSeconds(1), regex.MatchTimeout);
    }

    [Theory]
    [InlineData("UP 90 R0.125", BendDirection.Up, 0.125, "UP 90 R0.125")]
    [InlineData("DOWN 90 R0.313", BendDirection.Down, 0.313, "DOWN 90 R0.313")]
    [InlineData("DN 90 SHARP", BendDirection.Down, 0.0, "DN 90 SHARP")]
    [InlineData(@"{\fArial;UP\P90\U+00B0 R0.125}", BendDirection.Up, 0.125, "UP 90° R0.125")]
    [InlineData("UP\t90%%d   R0.125", BendDirection.Up, 0.125, "UP 90° R0.125")]
    [InlineData(@"UP 90 R0.125 \fUnterminated", BendDirection.Up, 0.125, @"UP 90 R0.125 \fUnterminated")]
    public void DetectBends_PreservesDirectionFormattingAndRadius(string text,
        BendDirection direction, double radius, string expectedNote)
    {
        var document = new ACadSharp.CadDocument();
        document.Entities.Add(new ACadSharp.Entities.Line(new CSMath.XYZ(0, 0, 0), new CSMath.XYZ(10, 0, 0))
        {
            Layer = new ACadSharp.Tables.Layer("BEND"),
            LineType = new ACadSharp.Tables.LineType("CENTER"),
        });
        document.Entities.Add(new ACadSharp.Entities.MText
        {
            Value = text,
            InsertPoint = new CSMath.XYZ(5, 0, 0),
            Height = 1,
        });

        var bend = Assert.Single(new SolidWorksBendDetector().DetectBends(document));
        Assert.Equal(direction, bend.Direction);
        Assert.Equal(90.0, bend.Angle);
        Assert.Equal(radius, bend.Radius);
        Assert.Equal(expectedNote, bend.NoteText);
    }

    [Fact]
    public void SolidWorksDetector_IsRegistered()
    {
        var detector = BendDetectorRegistry.GetByName("SolidWorks");
        Assert.NotNull(detector);
        Assert.Equal("SolidWorks", detector.Name);
    }

    [Fact]
    public void Registry_ContainsSolidWorksDetector()
    {
        Assert.Contains(BendDetectorRegistry.Detectors, d => d.Name == "SolidWorks");
    }

    [Fact]
    public void AutoDetect_EmptyDocument_ReturnsEmptyList()
    {
        var doc = new ACadSharp.CadDocument();
        var bends = BendDetectorRegistry.AutoDetect(doc);
        Assert.Empty(bends);
    }

    [Fact]
    public void EllipseConverter_ProducesArcsDirectly()
    {
        var path = Path.Combine(
            AppContext.BaseDirectory,
            "Bending",
            "TestData",
            "4526 A14 PT11 Test.dxf"
        );
        Assert.True(File.Exists(path), $"Test DXF not found: {path}");

        var result = OpenNest.IO.Dxf.Import(path);

        // EllipseConverter now produces arcs directly during import,
        // so the imported entities should contain Arc instances from the ellipses
        var arcCount = result.Entities.Count(e => e is OpenNest.Geometry.Arc);
        Assert.True(arcCount > 0, "Expected arcs from ellipse conversion");

        // The GeometrySimplifier should find few or no line runs to simplify,
        // because ellipses are already converted to arcs at import time
        var shape = new OpenNest.Geometry.Shape();
        shape.Entities.AddRange(result.Entities);

        var simplifier = new OpenNest.Geometry.GeometrySimplifier();
        var candidates = simplifier.Analyze(shape);

        Assert.True(
            candidates.Count <= 10,
            $"Expected <=10 simplifier candidates but got {candidates.Count}"
        );
    }

    [Fact]
    public void Import_TrimmedEllipse_NoClosingChord()
    {
        var path = Path.Combine(
            AppContext.BaseDirectory,
            "Bending",
            "TestData",
            "4526 A14 PT11.dxf"
        );
        Assert.True(File.Exists(path), $"Test DXF not found: {path}");

        var result = OpenNest.IO.Dxf.Import(path);

        // The DXF has 2 trimmed ellipses forming an oblong slot.
        // Trimmed ellipses must not generate a closing chord line.
        // EllipseConverter now produces arcs instead of line segments,
        // changing the entity count. Verify arcs are present and no
        // spurious closing chord exists.
        var arcCount = result.Entities.Count(e => e is OpenNest.Geometry.Arc);
        var circleCount = result.Entities.Count(e => e is OpenNest.Geometry.Circle);

        Assert.True(arcCount > 0, "Expected arcs from ellipse conversion");
        Assert.True(circleCount >= 7, $"Expected at least 7 circles, got {circleCount}");
        Assert.Equal(115, result.Entities.Count);
    }

    [Fact]
    public void DetectBends_SplitBendLine_PropagatesNote()
    {
        var path = Path.Combine(
            AppContext.BaseDirectory,
            "Bending",
            "TestData",
            "4526 A14 PT23.dxf"
        );
        Assert.True(File.Exists(path), $"Test DXF not found: {path}");

        using var reader = new DxfReader(path);
        var doc = reader.Read();

        var detector = new SolidWorksBendDetector();
        var bends = detector.DetectBends(doc);

        Assert.Equal(5, bends.Count);
        Assert.All(
            bends,
            b =>
            {
                Assert.NotNull(b.NoteText);
                Assert.NotNull(b.SourceNoteHandle);
                Assert.Contains(
                    doc.Entities,
                    e => e.Handle == b.SourceNoteHandle && e is ACadSharp.Entities.MText
                );
                Assert.Equal(BendDirection.Up, b.Direction);
                Assert.Equal(90.0, b.Angle);
                Assert.Equal(0.125, b.Radius);
            }
        );
    }

    [Fact]
    public void DetectBends_RealDxf_ParsesNotesCorrectly()
    {
        var path = Path.Combine(
            AppContext.BaseDirectory,
            "Bending",
            "TestData",
            "4526 A14 PT45.dxf"
        );
        Assert.True(File.Exists(path), $"Test DXF not found: {path}");

        using var reader = new DxfReader(path);
        var doc = reader.Read();

        var detector = new SolidWorksBendDetector();
        var bends = detector.DetectBends(doc);

        Assert.Equal(2, bends.Count);

        foreach (var bend in bends)
        {
            Assert.NotNull(bend.NoteText);
            Assert.Equal(BendDirection.Up, bend.Direction);
            Assert.Equal(90.0, bend.Angle);
            Assert.Equal(0.313, bend.Radius);
        }
    }
}