using Azimuth;
using UnitTestSharp;

namespace Glass.UnitTests
{
    public class ScrollAmountTests : TestFixture
    {
        public class CtorTests : TestFixture
        {
            public void SetsValueAndKind()
            {
                var amount = new ScrollAmount(15, ScrollAmount.AmountKind.FractionOfViewport);
                CheckEqual(15, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.FractionOfViewport, amount.Kind);
            }
        }

        public class AbsoluteTests : TestFixture
        {
            public void SetsValueAndKind()
            {
                var amount = ScrollAmount.Absolute(42);
                CheckEqual(42, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.Absolute, amount.Kind);
            }
        }

        public class FractionOfViewportTests : TestFixture
        {
            public void SetsValueAndKind()
            {
                var amount = ScrollAmount.FractionOfViewport(0.5);
                CheckEqual(0.5, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.FractionOfViewport, amount.Kind);
            }
        }

        public class ImplicitConversionTests : TestFixture
        {
            public void FromScalar_IsAbsolute()
            {
                Scalar value = 15;
                ScrollAmount amount = value;
                CheckEqual(15, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.Absolute, amount.Kind);
            }

            public void FromIntLiteral_IsAbsolute()
            {
                ScrollAmount amount = 15;
                CheckEqual(15, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.Absolute, amount.Kind);
            }

            public void FromFloatLiteral_IsAbsolute()
            {
                ScrollAmount amount = 15f;
                CheckEqual(15, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.Absolute, amount.Kind);
            }

            public void FromDoubleLiteral_IsAbsolute()
            {
                ScrollAmount amount = 15.0;
                CheckEqual(15, amount.Value);
                CheckEqual(ScrollAmount.AmountKind.Absolute, amount.Kind);
            }
        }

        public class ResolveTests : TestFixture
        {
            public void Absolute_IgnoresViewportSize()
            {
                CheckEqual(15, ScrollAmount.Absolute(15).Resolve(viewportSize: 1000));
            }

            public void FractionOfViewport_MultipliesByViewportSize()
            {
                CheckEqual(25, ScrollAmount.FractionOfViewport(0.25).Resolve(viewportSize: 100));
            }

            public void FractionOfViewport_ZeroViewportSize_IsZero()
            {
                CheckEqual(0, ScrollAmount.FractionOfViewport(0.25).Resolve(viewportSize: 0));
            }
        }
    }
}