using TraceCad.Core.Geometry;
using TraceCad.Core.Model;
using Xunit;

namespace TraceCad.Tests;

public sealed class GeometryTests
{
    [Fact]
    public void LineLengthUsesMillimetres()
    {
        var line = new LineEntity(Guid.NewGuid(), Layer.Cut.Name, new Point2(0, 0), new Point2(3, 4));

        Assert.Equal(5.0, line.Length, 9);
    }

    [Fact]
    public void CircleFromThreePointsComputesCenterAndRadius()
    {
        var success = GeometryHelpers.TryCreateCircleFromThreePoints(
            new Point2(1, 0),
            new Point2(0, 1),
            new Point2(-1, 0),
            out var circle);

        Assert.True(success);
        Assert.Equal(0.0, circle.Center.X, 9);
        Assert.Equal(0.0, circle.Center.Y, 9);
        Assert.Equal(1.0, circle.Radius, 9);
    }

    [Fact]
    public void CircleFromCollinearPointsFails()
    {
        var success = GeometryHelpers.TryCreateCircleFromThreePoints(
            new Point2(0, 0),
            new Point2(1, 1),
            new Point2(2, 2),
            out _);

        Assert.False(success);
    }

    [Fact]
    public void ArcFromThreePointsPreservesPointOnCounterClockwiseSweep()
    {
        var success = GeometryHelpers.TryCreateArcFromThreePoints(
            new Point2(1, 0),
            new Point2(0, 1),
            new Point2(-1, 0),
            out var arc);

        Assert.True(success);
        Assert.False(arc.IsClockwise);
        Assert.Equal(0.0, arc.StartAngleDeg, 9);
        Assert.Equal(180.0, arc.EndAngleDeg, 9);
        Assert.Equal(1.0, arc.Radius, 9);
    }

    [Fact]
    public void ArcFromCollinearPointsFails()
    {
        var success = GeometryHelpers.TryCreateArcFromThreePoints(
            new Point2(0, 0),
            new Point2(5, 0),
            new Point2(10, 0),
            out _);

        Assert.False(success);
    }

    [Theory]
    [InlineData(360, 0)]
    [InlineData(-90, 270)]
    [InlineData(725, 5)]
    public void AngleNormalizationWrapsToPositiveDegrees(double input, double expected)
    {
        Assert.Equal(expected, GeometryHelpers.NormalizeAngleDeg(input), 9);
    }
}