using System;

namespace Prism.UnitTests
{
    public class GradientStopTests : UnitTestSharp.TestFixture
    {
        public class CtorTests : UnitTestSharp.TestFixture
        {
            public void AssignsTheOffsetAndColor()
            {
                var stop = new GradientStop(0.25, Colors.Red);

                CheckEqual(0.25, stop.Offset);
                CheckEqual(Colors.Red, stop.Color);
            }

            public void OffsetsAtTheEnds_AreAllowed()
            {
                CheckEqual(0.0, new GradientStop(0, Colors.Red).Offset);
                CheckEqual(1.0, new GradientStop(1, Colors.Red).Offset);
            }

            public void OffsetBelowZero_Throws()
            {
                CheckThrow(typeof(ArgumentOutOfRangeException));
                new GradientStop(-0.1, Colors.Red);
            }

            public void OffsetAboveOne_Throws()
            {
                CheckThrow(typeof(ArgumentOutOfRangeException));
                new GradientStop(1.1, Colors.Red);
            }

            public void NaNOffset_Throws()
            {
                CheckThrow(typeof(ArgumentOutOfRangeException));
                new GradientStop(double.NaN, Colors.Red);
            }
        }

        public class EqualityTests : UnitTestSharp.TestFixture
        {
            public void SameOffsetAndColor_AreEqual()
            {
                var first = new GradientStop(0.5, Colors.Red);
                var second = new GradientStop(0.5, Colors.Red);

                CheckTrue(first.Equals(second));
                CheckTrue(first == second);
                CheckFalse(first != second);
            }

            public void ADifferentOffset_IsNotEqual()
            {
                CheckFalse(new GradientStop(0.5, Colors.Red).Equals(new GradientStop(0.25, Colors.Red)));
                CheckTrue(new GradientStop(0.5, Colors.Red) != new GradientStop(0.25, Colors.Red));
            }

            public void ADifferentColor_IsNotEqual()
            {
                CheckFalse(new GradientStop(0.5, Colors.Red).Equals(new GradientStop(0.5, Colors.Blue)));
            }

            public void BoxedStop_IsEqualToTheSameStop()
            {
                CheckTrue(new GradientStop(0.5, Colors.Red).Equals((object)new GradientStop(0.5, Colors.Red)));
            }

            public void ANonStop_IsNotEqual()
            {
                CheckFalse(new GradientStop(0.5, Colors.Red).Equals("stop"));
            }

            public void EqualStops_HaveTheSameHashCode()
            {
                CheckEqual(
                    new GradientStop(0.5, Colors.Red).GetHashCode(), new GradientStop(0.5, Colors.Red).GetHashCode());
            }
        }
    }
}