using Amphora;
using Prism;
using UnitTestSharp;

namespace Glass.UnitTests.Materials
{
    public class FlashingTextMaterialTests : TestFixture
    {
        public static readonly Color Red = Color.FromArgb(255, 200, 100, 0);

        public static FlashingTextMaterial FlashOf(Duration startAge, Duration length)
        {
            return new FlashingTextMaterial(BakedTextMaterialTests.Style(), "ab", Red, startAge, length);
        }

        public class CtorTests : TestFixture
        {
            public void KeepsTheTextAndTheStyle()
            {
                FlashingTextMaterial material = FlashOf(Duration.Zero, Duration.FromSeconds(1));

                CheckEqual("ab", material.Text.ToString());
                CheckEqual(BakedTextMaterialTests.Style(), material.Style);
            }

            public void KeepsTheFlashColorStartAndLength()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(3));

                CheckEqual(Red, material.FlashColor);
                CheckEqual(Duration.FromSeconds(2), material.StartAge);
                CheckEqual(Duration.FromSeconds(3), material.Length);
            }

            public void WithCopy_KeepsTheFlash()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(3));

                FlashingTextMaterial copy = material with { Scale = 2 };

                CheckEqual(Red, copy.FlashColor);
                CheckEqual(Duration.FromSeconds(2), copy.StartAge);
                CheckEqual(Duration.FromSeconds(3), copy.Length);
            }
        }

        public class IsFlashingAtTests : TestFixture
        {
            public void BeforeTheStart_IsFalse()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckFalse(material.IsFlashingAt(Duration.FromSeconds(1.9)));
            }

            public void AtTheStart_IsTrue()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckTrue(material.IsFlashingAt(Duration.FromSeconds(2)));
            }

            public void JustBeforeTheEnd_IsTrue()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckTrue(material.IsFlashingAt(Duration.FromSeconds(2.9)));
            }

            public void AtTheEnd_IsFalse()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckFalse(material.IsFlashingAt(Duration.FromSeconds(3)));
            }

            public void AZeroLength_IsNeverTrue()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.Zero);

                CheckFalse(material.IsFlashingAt(Duration.FromSeconds(2)));
            }
        }

        public class ColorAtTests : TestFixture
        {
            public void AtTheStart_IsTheFlashColor()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckEqual(Red, material.ColorAt(Duration.FromSeconds(2), Colors.Black));
            }

            public void HalfwayThrough_IsHalfwayToTheNormalColor()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckEqual(Color.FromArgb(255, 100, 50, 0), material.ColorAt(Duration.FromSeconds(2.5), Colors.Black));
            }

            public void FadesTheAlphaToo()
            {
                var material = new FlashingTextMaterial(BakedTextMaterialTests.Style(), "ab",
                    Color.FromArgb(200, 10, 20, 30), Duration.Zero, Duration.FromSeconds(1));

                CheckEqual(Color.FromArgb(100, 5, 10, 15),
                    material.ColorAt(Duration.FromSeconds(0.5), Color.FromArgb(0, 0, 0, 0)));
            }

            public void WithNoNormalColor_FadesToWhite()
            {
                FlashingTextMaterial material = FlashOf(Duration.Zero, Duration.FromSeconds(4));

                CheckEqual(Color.FromArgb(255, 214, 139, 64), material.ColorAt(Duration.FromSeconds(1), null));
            }

            public void BeforeTheStart_IsNull()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckNull(material.ColorAt(Duration.FromSeconds(1), Colors.Black));
            }

            public void AtTheEnd_IsNull()
            {
                FlashingTextMaterial material = FlashOf(Duration.FromSeconds(2), Duration.FromSeconds(1));

                CheckNull(material.ColorAt(Duration.FromSeconds(3), Colors.Black));
            }
        }
    }
}