// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System.Numerics;
using System.Runtime.CompilerServices;
using SixLabors.ImageSharp.PixelFormats;

namespace SixLabors.ImageSharp.Tests.PixelFormats;

[Trait("Category", "PixelFormats")]
public class Rgba1010102Tests
{
    /// <summary>
    /// Tests the equality operators for equality.
    /// </summary>
    [Fact]
    public void AreEqual()
    {
        Rgba1010102 color1 = new(0.0f, 0.0f, 0.0f, 0.0f);
        Rgba1010102 color2 = new(new Vector4(0.0f));
        Rgba1010102 color3 = new(new Vector4(1f, 0.0f, 1f, 1f));
        Rgba1010102 color4 = new(1f, 0.0f, 1f, 1f);

        Assert.Equal(color1, color2);
        Assert.Equal(color3, color4);
    }

    /// <summary>
    /// Tests the equality operators for inequality.
    /// </summary>
    [Fact]
    public void AreNotEqual()
    {
        Rgba1010102 color1 = new(0.0f, 0.0f, 0.0f, 0.0f);
        Rgba1010102 color2 = new(new Vector4(1f));
        Rgba1010102 color3 = new(new Vector4(1f, 0.0f, 0.0f, 1f));
        Rgba1010102 color4 = new(1f, 1f, 0.0f, 1f);

        Assert.NotEqual(color1, color2);
        Assert.NotEqual(color3, color4);
    }

    [Fact]
    public void Rgba1010102_PackedValue()
    {
        const float x = 0x2db;
        const float y = 0x36d;
        const float z = 0x3b7;
        const float w = 0x1;
        Assert.Equal(0x7B7DB6DBU, new Rgba1010102(x / 0x3ff, y / 0x3ff, z / 0x3ff, w / 3).PackedValue);

        Assert.Equal(536871014U, new Rgba1010102(0.1f, -0.3f, 0.5f, -0.7f).PackedValue);

        // Test the limits.
        Assert.Equal(0x0U, new Rgba1010102(Vector4.Zero).PackedValue);
        Assert.Equal(0xFFFFFFFF, new Rgba1010102(Vector4.One).PackedValue);
    }

    [Fact]
    public void Rgba1010102_ToVector4()
    {
        Assert.Equal(Vector4.Zero, new Rgba1010102(Vector4.Zero).ToVector4());
        Assert.Equal(Vector4.One, new Rgba1010102(Vector4.One).ToVector4());
    }

    [Fact]
    public void Rgba1010102_ToScaledVector4()
    {
        // arrange
        Rgba1010102 rgba = new(Vector4.One);

        // act
        Vector4 actual = rgba.ToScaledVector4();

        // assert
        Assert.Equal(1, actual.X);
        Assert.Equal(1, actual.Y);
        Assert.Equal(1, actual.Z);
        Assert.Equal(1, actual.W);
    }

    [Fact]
    public void Rgba1010102_FromScaledVector4()
    {
        // arrange
        Rgba1010102 rgba = new(Vector4.One);
        const uint expected = 0xFFFFFFFF;

        // act
        Vector4 scaled = rgba.ToScaledVector4();
        Rgba1010102 actual = Rgba1010102.FromScaledVector4(scaled);

        // assert
        Assert.Equal(expected, actual.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromBgra5551()
    {
        // arrange
        const uint expected = 0xFFFFFFFF;

        // act
        Rgba1010102 rgba = Rgba1010102.FromBgra5551(new Bgra5551(1f, 1f, 1f, 1f));

        // assert
        Assert.Equal(expected, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromArgb32()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromArgb32(new Argb32(255, 255, 255, 255));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromRgba32()
    {
        // arrange
        const uint expectedPackedValue1 = uint.MaxValue;
        const uint expectedPackedValue2 = 0xFFF003FF;

        // act
        Rgba1010102 rgba1 = Rgba1010102.FromRgba32(new Rgba32(255, 255, 255, 255));
        Rgba1010102 rgba2 = Rgba1010102.FromRgba32(new Rgba32(255, 0, 255, 255));

        // assert
        Assert.Equal(expectedPackedValue1, rgba1.PackedValue);
        Assert.Equal(expectedPackedValue2, rgba2.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromBgr24()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromBgr24(new Bgr24(byte.MaxValue, byte.MaxValue, byte.MaxValue));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromGrey8()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromL8(new L8(byte.MaxValue));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromGrey16()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromL16(new L16(ushort.MaxValue));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromRgb24()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromRgb24(new Rgb24(byte.MaxValue, byte.MaxValue, byte.MaxValue));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromRgb48()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromRgb48(new Rgb48(ushort.MaxValue, ushort.MaxValue, ushort.MaxValue));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_FromRgba64()
    {
        // arrange
        const uint expectedPackedValue = uint.MaxValue;

        // act
        Rgba1010102 rgba = Rgba1010102.FromRgba64(new Rgba64(ushort.MaxValue, ushort.MaxValue, ushort.MaxValue, ushort.MaxValue));

        // assert
        Assert.Equal(expectedPackedValue, rgba.PackedValue);
    }

    [Fact]
    public void Rgba1010102_Clamping()
    {
        Assert.Equal(Vector4.Zero, new Rgba1010102(Vector4.One * -1234.0f).ToVector4());
        Assert.Equal(Vector4.One, new Rgba1010102(Vector4.One * 1234.0f).ToVector4());
    }

    [Fact]
    public void Rgba1010102_ToRgba32()
    {
        // arrange
        Rgba1010102 rgba = new(0.1f, -0.3f, 0.5f, -0.7f);
        Rgba32 expected = new(25, 0, 128, 0);

        // act
        Rgba32 actual = rgba.ToRgba32();

        // assert
        Assert.Equal(expected, actual);
    }

    [Fact]
    public void Rgba1010102_PixelInformation()
    {
        PixelTypeInfo info = Rgba1010102.GetPixelTypeInfo();
        Assert.Equal(Unsafe.SizeOf<Rgba1010102>() * 8, info.BitsPerPixel);
        Assert.Equal(PixelAlphaRepresentation.Unassociated, info.AlphaRepresentation);
        Assert.Equal(PixelColorType.RGB | PixelColorType.Alpha, info.ColorType);

        PixelComponentInfo componentInfo = info.ComponentInfo.Value;
        Assert.Equal(4, componentInfo.ComponentCount);
        Assert.Equal(0, componentInfo.Padding);
        Assert.Equal(10, componentInfo.GetComponentPrecision(0));
        Assert.Equal(10, componentInfo.GetComponentPrecision(1));
        Assert.Equal(10, componentInfo.GetComponentPrecision(2));
        Assert.Equal(2, componentInfo.GetComponentPrecision(3));
        Assert.Equal(10, componentInfo.GetMaximumComponentPrecision());
    }
}