using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Annulus.DiscreteCollisionDetection;
using Annulus;
using Azimuth;

namespace Annulus.UnitTests.DiscreteCollisionDetection
{
    public class SegmentPointTests : UnitTestSharp.TestFixture
    {
        public class DistanceTests : UnitTestSharp.TestFixture
        {
            public void Basic()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(-10, 0),
                    To = new Vector(3, 0),
                }, new Vector(0, 3));

                CheckEqual(9, distance);
            }

            public void TooLeft()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(-1, 0),
                    To = new Vector(1, 0),
                }, new Vector(-3, 0));

                CheckEqual(4, distance);
            }

            public void TooRight()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(-1, 0),
                    To = new Vector(1, 0),
                }, new Vector(3, 0));

                CheckEqual(4, distance);
            }

            public void DegenerateLine_SamePoint()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(1, 0),
                    To = new Vector(1, 0),
                }, new Vector(1, 0));

                CheckEqual(0, distance);
            }

            public void DegenerateLine_DifferentPoint()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(1, 0),
                    To = new Vector(1, 0),
                }, new Vector(5, 0));

                CheckEqual(16, distance);
            }

            public void NaNs_Line()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(Scalar.NaN, 0),
                    To = new Vector(1, 0),
                }, new Vector(5, 0));

                Check(Scalar.IsNaN(distance));
            }

            public void NaNs_Point()
            {
                Scalar distance = SegmentPoint.DistanceSquared(new Line
                {
                    From = new Vector(2, 0),
                    To = new Vector(1, 0),
                }, new Vector(Scalar.NaN, 0));

                Check(Scalar.IsNaN(distance));
            }
        }
    }
}