using PepLib.Codes;
using PepLib.Enums;
using PepLib.Geometry;
using PepLib.IO;
using PepLib.Models;
using Xunit;

namespace PepLib.Core.Tests.IO;

public class DrawingDxfExporterTests
{
    [Fact]
    public void Export_RectangularLoop_ProducesFourLines()
    {
        // Arrange: a square 10x10 in incremental mode
        var drawing = new Drawing();
        drawing.Info = new DrawingInfo { Name = "TEST" };
        var loop = new Loop { Name = "TEST.loop-000" };
        // Mode defaults to Incremental in Loop constructor
        loop.Add(new RapidMove(new Vector(0, 0)));   // position at (0,0)
        loop.Add(new LinearMove(new Vector(10, 0)));  // → (10,0)
        loop.Add(new LinearMove(new Vector(0, 10)));  // → (10,10)
        loop.Add(new LinearMove(new Vector(-10, 0))); // → (0,10)
        loop.Add(new LinearMove(new Vector(0, -10))); // → (0,0)
        drawing.Loops.Add(loop);

        // Act
        using var stream = DrawingDxfExporter.Export(drawing);

        // Assert: stream is non-empty and contains 4 line entities
        Assert.True(stream.Length > 0);

        stream.Position = 0;
        using var reader = new ACadSharp.IO.DxfReader(stream);
        var doc = reader.Read();
        var lines = doc.Entities.OfType<ACadSharp.Entities.Line>().ToList();
        var arcs = doc.Entities.OfType<ACadSharp.Entities.Arc>().ToList();
        Assert.Equal(4, lines.Count);
        Assert.Empty(arcs);
    }

    [Fact]
    public void Export_LoopWithArc_ProducesLineAndArc()
    {
        var drawing = new Drawing();
        drawing.Info = new DrawingInfo { Name = "TEST" };
        var loop = new Loop { Name = "TEST.loop-000" };
        loop.Add(new RapidMove(new Vector(5, 0)));                              // start at (5,0)
        loop.Add(new LinearMove(new Vector(5, 0)));                             // → (10,0)
        loop.Add(new CircularMove(new Vector(-5, 5), new Vector(-5, 0), RotationType.CCW)); // arc: end=(5,5), center=(5,0)
        drawing.Loops.Add(loop);

        using var stream = DrawingDxfExporter.Export(drawing);

        stream.Position = 0;
        using var reader = new ACadSharp.IO.DxfReader(stream);
        var doc = reader.Read();
        var lines = doc.Entities.OfType<ACadSharp.Entities.Line>().ToList();
        var arcs = doc.Entities.OfType<ACadSharp.Entities.Arc>().ToList();
        Assert.Single(lines);
        Assert.Single(arcs);
        var arc = doc.Entities.OfType<ACadSharp.Entities.Arc>().Single();
        // Angles must be in degrees (0..360), not radians (0..6.28)
        Assert.InRange(arc.StartAngle, 0, 360);
        Assert.InRange(arc.EndAngle, 0, 360);
    }
}