using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Azimuth;
using Annulus;

namespace Annulus.UnitTests
{
    public class ConvexPolygonTests : UnitTestSharp.TestFixture
    {
        public void Square()
        {
            var vertices = new Vector[]
            {
                new Vector (10, 10),
                new Vector (10, -10),
                new Vector (-10, -10),
                new Vector (-10, 10),
            };

            var poly = new ConvexPolygon(vertices);

            CheckEqual(poly.VertexList, vertices);
        }

        public void ConcaveShape()
        {
            var vertices = new Vector[]
            {
                new Vector (10, 10),
                new Vector (0, 0),
                new Vector (10, -10),
                new Vector (-10, -10),
                new Vector (-10, 10),
            };

            CheckThrow(typeof(Exception));
            var poly = new ConvexPolygon(vertices);
        }

        public class SupportVertexTests : UnitTestSharp.TestFixture
        {
            public void Basic()
            {
                var vertices = new Vector[]
                {
                    new Vector (10, 10),
                    new Vector (10, -10),
                    new Vector (-10, -10),
                    new Vector (-10, 10),
                };

                var poly = new ConvexPolygon(vertices);

                var vertex = poly.SupportVertex(new Vector(-1, 1));

                CheckEqual(poly.GetVertex(3), vertex);
            }

            public void ZeroMagnitudeDirection()
            {
                var vertices = new Vector[]
                {
                    new Vector (10, 10),
                    new Vector (10, -10),
                    new Vector (-10, -10),
                    new Vector (-10, 10),
                };

                var poly = new ConvexPolygon(vertices);

                var vertex = poly.SupportVertex(new Vector(0, 0));

                CheckEqual(poly.GetVertex(0), vertex);
            }

            public void AmbiguousDirection()
            {
                var vertices = new Vector[]
                {
                    new Vector (10, 10),
                    new Vector (10, -10),
                    new Vector (-10, -10),
                    new Vector (-10, 10),
                };

                var poly = new ConvexPolygon(vertices);

                var vertex = poly.SupportVertex(new Vector(-1, 0));

                CheckEqual(poly.GetVertex(2), vertex);
            }
        }
    }
}