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

namespace Annulus.UnitTests.Splines
{
    public class PiecewiseSplineTests : UnitTestSharp.TestFixture
    {
        public void JustOneSpline()
        {
            var spline = new PiecewiseSpline<Scalar>(new LinearSpline<Scalar>(10, -10));

            CheckEqual(-110, spline.EvaluateAt(-10));
            CheckEqual(-10, spline.EvaluateAt(0));
            CheckEqual(90, spline.EvaluateAt(10));
        }

        public void TwoSplinesDisjoint()
        {
            var spline = new PiecewiseSpline<Scalar>(new LinearSpline<Scalar>(10, -10));
            spline.AddNewMotion(new ConstantSpline<Scalar>(1000), 1);

            CheckEqual(-110, spline.EvaluateAt(-10));
            CheckEqual(-10, spline.EvaluateAt(0));
            CheckEqual(0, spline.EvaluateAt(1));
            CheckEqual(0, spline.EvaluateAt(10));
            CheckEqual(0, spline.EvaluateAt(1000));
        }

        public void StompValues()
        {
            var spline = new PiecewiseSpline<Scalar>(new LinearSpline<Scalar>(10, -10));
            spline.AddNewMotion(new ConstantSpline<Scalar>(1000), 10);
            spline.AddNewMotion(new ConstantSpline<Scalar>(1000), 1);

            CheckEqual(-110, spline.EvaluateAt(-10));
            CheckEqual(-10, spline.EvaluateAt(0));
            CheckEqual(0, spline.EvaluateAt(1));
            CheckEqual(0, spline.EvaluateAt(10));
            CheckEqual(0, spline.EvaluateAt(1000));
        }

        public void RecentersTime()
        {
            var spline = new PiecewiseSpline<Scalar>(new LinearSpline<Scalar>(10, -10));
            spline.AddNewMotion(new QuadraticSpline<Scalar>(1, 0, 0), 2);

            CheckEqual(-110, spline.EvaluateAt(-10));
            CheckEqual(-10, spline.EvaluateAt(0));
            CheckEqual(10, spline.EvaluateAt(2));
            CheckEqual(14, spline.EvaluateAt(4));
            CheckEqual(110, spline.EvaluateAt(12));
        }

        public void AABB_ScalarTest()
        {
            var spline = new PiecewiseSpline<Scalar>(new LinearSpline<Scalar>(2, -4));
            spline.AddNewMotion(new ConstantSpline<Scalar>(8), 6);
            var range = new Interval(-1, 20);
            var expected = new AABB<Scalar>(-6, 8);
            var observed = spline.GetAABB(range);

            CheckEqual(expected, observed);
        }

        public void AABB_VectorTest()
        {
            var spline = new PiecewiseSpline<Vector>(new LinearSpline<Vector>(new Vector(2, 3), new Vector(-4,2)));
            spline.AddNewMotion(new ConstantSpline<Vector>(new Vector(8, 20)), 6);
            var range = new Interval(-1, 20);
            var expected = new AABB<Vector>(new Vector(-6, -1), new Vector(8, 20));
            var observed = spline.GetAABB(range);

            CheckEqual(expected, observed);
        }
    }
}