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

namespace Annulus.UnitTests.DiscreteCollisionDetection
{
    public class LinePointTests : UnitTestSharp.TestFixture
    {
        public void Basic()
        {
            Vector pt = new Vector(0, 0);

            var line = new Line
            {
                From = new Vector(-1, 0),
                To = new Vector(1, 0),
            };

            Scalar t;
            var status = LinePoint.ClosestPointOnLineToPoint(line, pt, out t);

            CheckEqual(0.5, t);
            CheckEqual(LinePoint.Status.Success, status);
        }

        public void Perpindicular()
        {
            Vector pt = new Vector(0, 7);

            var line = new Line
            {
                From = new Vector(-1, 0),
                To = new Vector(1, 0),
            };

            Scalar t;
            var status = LinePoint.ClosestPointOnLineToPoint(line, pt, out t);

            CheckEqual(0.5, t);
            CheckEqual(LinePoint.Status.Success, status);
        }

        public void Infinity_Perp()
        {
            Vector pt = new Vector(0, Scalar.PositiveInfinity);

            var line = new Line
            {
                From = new Vector(-1, 0),
                To = new Vector(1, 0),
            };

            Scalar t;
            var status = LinePoint.ClosestPointOnLineToPoint(line, pt, out t);

            Check(Scalar.IsNaN(t));
            CheckEqual(LinePoint.Status.Degenerate, status);
        }

        public void Infinity_Parallel()
        {
            Vector pt = new Vector(Scalar.PositiveInfinity, 0);

            var line = new Line
            {
                From = new Vector(-1, 0),
                To = new Vector(1, 0),
            };

            Scalar t;
            var status = LinePoint.ClosestPointOnLineToPoint(line, pt, out t);

            Check(Scalar.IsNaN(t));
            CheckEqual(LinePoint.Status.Degenerate, status);
        }

        public void Line_Infinity()
        {
            Vector pt = new Vector(0, 0);

            var line = new Line
            {
                From = new Vector(Scalar.NegativeInfinity, 0),
                To = new Vector(Scalar.PositiveInfinity, 0),
            };

            Scalar t;
            var status = LinePoint.ClosestPointOnLineToPoint(line, pt, out t);

            Check(Scalar.IsNaN(t));
            CheckEqual(LinePoint.Status.Degenerate, status);
        }
    }
}