#if !UNITY_5_6_OR_NEWER
using NUnit.Framework;

namespace LinearAlgebra.Test {
    using Vector2 = Vector2Float;

    public class Vector2FloatTest {

        [SetUp]
        public void Setup() {
        }

        [Test]
        public void FromPolar() {
        }

        [Test]
        public void Equality() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);

            Assert.IsFalse(v1 == v2, "4 5 == 1 2");
            Assert.IsTrue(v1 != v2, "4 5 != 1 2");

            v2 = new(4, 5);
            Assert.IsTrue(v1 == v2, "4 5 == 4 5");
            Assert.IsFalse(v1 != v2, "4 5 != 4 5");
        }

        [Test]
        public void Magnitude() {
            Vector2 v = new(1, 2);
            float m = 0;
            m = v.magnitude;
            Assert.AreEqual(m, 2.236068F, "v.magnitude 1 2");

            m = Vector2.MagnitudeOf(v);
            Assert.AreEqual(m, 2.236068F, "MagnitudeOf 1 2");

            v = new(-1, -2);
            m = v.magnitude;
            Assert.AreEqual(m, 2.236068F, "v.magnitude -1 -2");

            v = new(0, 0);
            m = v.magnitude;
            Assert.AreEqual(m, 0, "v.magnitude 0 0");
        }

        [Test]
        public void SqrMagnitude() {
            Vector2 v = new(1, 2);
            float m = 0;

            m = v.sqrMagnitude;
            Assert.AreEqual(m, 5, "v.sqrMagnitude 1 2");

            m = Vector2.SqrMagnitudeOf(v);
            Assert.AreEqual(m, 5, "SqrMagnitudeOf 1 2");

            v = new(-1, -2);
            m = v.sqrMagnitude;
            Assert.AreEqual(m, 5, "v.sqrMagnitude -1 -2");

            v = new(0, 0);
            m = v.sqrMagnitude;
            Assert.AreEqual(m, 0, "v.sqrMagnitude 0 0");
        }

        [Test]
        public void Distance() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            float f = 0;

            f = Vector2.Distance(v1, v2);
            Assert.AreEqual(f, 4.24264002f, 1.0E-05F, "Distance(4 5, 1 2)");

            v2 = new(-1, -2);
            f = Vector2.Distance(v1, v2);
            Assert.AreEqual(f, 8.602325F, "Distance(4 5, 1 2)");

            v2 = new(0, 0);
            f = Vector2.Distance(v1, v2);
            Assert.AreEqual(f, 6.403124F, 1.0E-05F, "Distance(4 5, 1 2)");
        }

        [Test]
        public void Normalize() {
            Vector2 v = new(0, 3);
            Vector2Float r;

            r = v.normalized;
            Assert.AreEqual(0, r.horizontal, "normalized 0 3  H");
            Assert.AreEqual(1, r.vertical, "normalized 0 3  V");

            r = Vector2.Normalize(v);
            Assert.AreEqual(0, r.horizontal, "Normalize 0 3  H");
            Assert.AreEqual(1, r.vertical, "Normalize 0 3  V");

            v = new(0, -3);
            r = v.normalized;
            Assert.AreEqual(0, r.horizontal, "normalized 0 -3  H");
            Assert.AreEqual(-1, r.vertical, "normalized 0 -3  V");

            v = new(0, 0);
            r = v.normalized;
            Assert.AreEqual(0, r.horizontal, "normalized 0 0  H");
            Assert.AreEqual(0, r.vertical, "normalized 0 0  V");
        }

        [Test]
        public void Negate() {
            Vector2 v = new(4, 5);
            Vector2 r;

            r = -v;
            Assert.AreEqual(-4, r.horizontal, "- 4 5 H");
            Assert.AreEqual(-5, r.vertical, "- 4 5 V");

            v = new(-4, -5);
            r = -v;
            Assert.AreEqual(4, r.horizontal, "- -4 -5 H");
            Assert.AreEqual(5, r.vertical, "- -4 -5 V");

            v = new(0, 0);
            r = -v;
            Assert.AreEqual(0, r.horizontal, "- 0 0 H");
            Assert.AreEqual(0, r.vertical, "- 0 0 V");
        }

        [Test]
        public void Subtract() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            Vector2 r = Vector2.zero;

            r = v1 - v2;
            Assert.IsTrue(r == new Vector2(3, 3), "4 5 - 1 2");

            v2 = new(-1, -2);
            r = v1 - v2;
            Assert.IsTrue(r == new Vector2(5, 7), "4 5 - -1 -2");

            v2 = new(4, 5);
            r = v1 - v2;
            Assert.IsTrue(r == new Vector2(0, 0), "4 5 - 4 5");
            r = v1;
            r -= v2;
            Assert.AreEqual(r, new Vector2(0, 0), "4 5 - 4 5");

            v2 = new(0, 0);
            r = v1 - v2;
            Assert.AreEqual(r, new Vector2(4, 5), "4 5 - 0 0");
            r -= v2;
            Assert.AreEqual(r, new Vector2(4, 5), "4 5 - 0 0");
        }

        [Test]
        public void Addition() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            Vector2 r = Vector2.zero;

            r = v1 + v2;
            Assert.IsTrue(r == new Vector2(5, 7), "4 5 + 1 2");

            v2 = new(-1, -2);
            r = v1 + v2;
            Assert.IsTrue(r == new Vector2(3, 3), "4  5 + -1 -2");
            r = v1;
            r += v2;
            Assert.AreEqual(r, new Vector2(3, 3), "4 5 + -1 -2");

            v2 = new(0, 0);
            r = v1 + v2;
            Assert.AreEqual(r, new Vector2(4, 5), "4 5 + 0 0");
            r += v2;
            Assert.AreEqual(r, new Vector2(4, 5), "4 5 + 0 0");
        }

        [Test]
        public void Scale() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            Vector2 r;

            r = Vector2.Scale(v1, v2);
            Assert.AreEqual(4, r.horizontal, "Scale 4 5 , 1 2  H");
            Assert.AreEqual(10, r.vertical, "Scale 4 5 , 1 2  V");

            v2 = new(-1, -2);
            r = Vector2.Scale(v1, v2);
            Assert.AreEqual(-4, r.horizontal, "Scale 4 5 , -1 -2  H");
            Assert.AreEqual(-10, r.vertical, "Scale 4 5 , -1 -2  V");

            v2 = new(0, 0);
            r = Vector2.Scale(v1, v2);
            Assert.AreEqual(0, r.horizontal, "Scale 4 5 , 0 0  H");
            Assert.AreEqual(0, r.vertical, "Scale 4 5 , 0 0  V");
        }

        [Test]
        public void Multiply() {
            Vector2 v1 = new(4, 5);
            int f = 3;
            Vector2 r;

            r = v1 * f;
            Assert.AreEqual(12, r.horizontal, "4 5 * 3  H");
            Assert.AreEqual(15, r.vertical, "4 5 * 3  V");

            r = f * v1;
            Assert.AreEqual(12, r.horizontal, "3 * 4 5  H");
            Assert.AreEqual(15, r.vertical, "3 * 4 5  V");

            f = -3;
            r = v1 * f;
            Assert.AreEqual(-12, r.horizontal, "4 5 * -3  H");
            Assert.AreEqual(-15, r.vertical, "4 5 * -3  V");

            f = 0;
            r = v1 * f;
            Assert.AreEqual(0, r.horizontal, "4 5 * 0  H");
            Assert.AreEqual(0, r.vertical, "4 5 * 0  V");
        }

        [Test]
        public void Divide() {
            Vector2 v1 = new(4, 5);
            float f = 2;
            Vector2 r;

            r = v1 / f;
            Assert.AreEqual(2, r.horizontal, "4 5 / 2  H");
            Assert.AreEqual(2.5, r.vertical, "4 5 / 2  V");

            f = -2;
            r = v1 / f;
            Assert.AreEqual(-2, r.horizontal, "4 5 / -2 H");
            Assert.AreEqual(-2.5, r.vertical, "4 5 / -2  V");

            f = 0;
            r = v1 / f;
            Assert.AreEqual(float.PositiveInfinity, r.horizontal, "4 5 / 0  H");
            Assert.AreEqual(float.PositiveInfinity, r.vertical, "4 5 / 0  V");
        }

        [Test]
        public void Dot() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            float f;

            f = Vector2.Dot(v1, v2);
            Assert.AreEqual(14, f, "Dot(4 5, 1 2)");

            v2 = new(-1, -2);
            f = Vector2.Dot(v1, v2);
            Assert.AreEqual(-14, f, "Dot(4 5, -1 -2)");

            v2 = new(0, 0);
            f = Vector2.Dot(v1, v2);
            Assert.AreEqual(0, f, "Dot(4 5, 0 0)");
        }

        [Test]
        public void SignedAngle() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            float f;

            f = Vector2.SignedAngle(v1, v2);
            Assert.AreEqual(-12.094758f, f);

            v2 = new(-1, -2);
            f = Vector2.SignedAngle(v1, v2);
            Assert.AreEqual(167.905228f, f);

            v2 = new(0, 0);
            f = Vector2.SignedAngle(v1, v2);
            Assert.AreEqual(0, f);

            v1 = new(0, 1);
            v2 = new(1, 0);
            f = Vector2.SignedAngle(v1, v2);
            Assert.AreEqual(90, f);

            v1 = new(0, 1);
            v2 = new(0, -1);
            f = Vector2.SignedAngle(v1, v2);
            Assert.AreEqual(180, f);
        }

        [Test]
        public void UnsignedAngle() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            float f;

            f = Vector2.UnsignedAngle(v1, v2);
            Assert.AreEqual(12.094758f, f);

            v2 = new(-1, -2);
            f = Vector2.UnsignedAngle(v1, v2);
            Assert.AreEqual(167.905228f, f);

            v2 = new(0, 0);
            f = Vector2.UnsignedAngle(v1, v2);
            Assert.AreEqual(0, f);

            v1 = new(0, 1);
            v2 = new(1, 0);
            f = Vector2.UnsignedAngle(v1, v2);
            Assert.AreEqual(90, f);

            v1 = new(0, 1);
            v2 = new(0, -1);
            f = Vector2.UnsignedAngle(v1, v2);
            Assert.AreEqual(180, f);            
        }

        [Test]
        public void Rotate() {
            Vector2 v1 = new(1, 2);
            Vector2 r;

            r = Vector2.Rotate(v1, AngleFloat.Degrees(0));
            Assert.AreEqual(0, Vector2.Distance(r, v1));

            r = Vector2.Rotate(v1, AngleFloat.Degrees(180));
            Assert.AreEqual(0, Vector2.Distance(r, new Vector2(-1, -2)), 1.0e-06);

            r = Vector2.Rotate(v1, AngleFloat.Degrees(-90));
            Assert.AreEqual(0, Vector2.Distance(r, new Vector2(2, -1)), 1.0e-06);

            r = Vector2.Rotate(v1, AngleFloat.Degrees(270));
            Assert.AreEqual(0, Vector2.Distance(r, new Vector2(2, -1)), 1.0e-06);
        }

        [Test]
        public void Lerp() {
            Vector2 v1 = new(4, 5);
            Vector2 v2 = new(1, 2);
            Vector2 r;

            r = Vector2.Lerp(v1, v2, 0);
            Assert.AreEqual(0, Vector2.Distance(r, v1), 0);

            r = Vector2.Lerp(v1, v2, 1);
            Assert.AreEqual(0, Vector2.Distance(r, v2), 0);

            r = Vector2.Lerp(v1, v2, 0.5f);
            Assert.AreEqual(0, Vector2.Distance(r, new Vector2(2.5f, 3.5f)), 0);

            r = Vector2.Lerp(v1, v2, -1);
            Assert.AreEqual(0, Vector2.Distance(r, new Vector2(7, 8)), 0);

            r = Vector2.Lerp(v1, v2, 2);
            Assert.AreEqual(0, Vector2.Distance(r, new Vector2(-2, -1)), 0);
        }

    }
}
#endif