using UnitTestSharp;
using Blacklight.Core;
using Blacklight.SharpDX9.Extensions;

namespace Blacklight.SharpDX9.UnitTesting
{
    public class ColorTests : TestFixture
    {
        public class ToArgbTests : TestFixture
        {
            // ToArgb() replaced two legacy packings: the explicit ToDX().ToArgb() and the implicit Color4->int the
            // sprite path leaned on.  It has to reproduce both bit-for-bit across the whole 0..255 range or colors
            // shift.
            public void MatchesLegacySharpDXPacking()
            {
                void CheckChannels(byte red, byte green, byte blue, byte alpha)
                {
                    var color = new Color { Red = red, Green = green, Blue = blue, Alpha = alpha };
                    int viaExplicitToArgb = color.ToDX().ToArgb();
                    int viaImplicitColor4 = color.ToDX();
                    CheckEqual(viaExplicitToArgb, color.ToArgb());
                    CheckEqual(viaImplicitColor4, color.ToArgb());
                }

                for (int value = 0; value <= 255; ++value)
                {
                    CheckChannels((byte)value, 0, 0, 0);
                    CheckChannels(0, (byte)value, 0, 0);
                    CheckChannels(0, 0, (byte)value, 0);
                    CheckChannels(0, 0, 0, (byte)value);
                    CheckChannels((byte)value, (byte)value, (byte)value, (byte)value);
                }
            }
        }
    }
}