// Copyright (c) Six Labors and contributors.
// Licensed under the Apache License, Version 2.0.

using System.Numerics;
using SixLabors.ImageSharp.PixelFormats;
using Xunit;

namespace SixLabors.ImageSharp.Tests.PixelFormats
{
    public class NormalizedByte4Tests
    {
        /// <summary>
        /// Tests the equality operators for equality.
        /// </summary>
        [Fact]
        public void AreEqual()
        {
            var color1 = new NormalizedByte4(0.0f, 0.0f, 0.0f, 0.0f);
            var color2 = new NormalizedByte4(new Vector4(0.0f));
            var color3 = new NormalizedByte4(new Vector4(1.0f, 0.0f, 1.0f, 1.0f));
            var color4 = new NormalizedByte4(1.0f, 0.0f, 1.0f, 1.0f);

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

        /// <summary>
        /// Tests the equality operators for inequality.
        /// </summary>
        [Fact]
        public void AreNotEqual()
        {
            var color1 = new NormalizedByte4(0.0f, 0.0f, 0.0f, 0.0f);
            var color2 = new NormalizedByte4(new Vector4(1.0f));
            var color3 = new NormalizedByte4(new Vector4(1.0f, 0.0f, 0.0f, 1.0f));
            var color4 = new NormalizedByte4(1.0f, 1.0f, 0.0f, 1.0f);

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

        [Fact]
        public void NormalizedByte4_PackedValues()
        {
            Assert.Equal(0xA740DA0D, new NormalizedByte4(0.1f, -0.3f, 0.5f, -0.7f).PackedValue);
            Assert.Equal(958796544U, new NormalizedByte4(0.0008f, 0.15f, 0.30f, 0.45f).PackedValue);
            Assert.Equal(0x0U, new NormalizedByte4(Vector4.Zero).PackedValue);
            Assert.Equal(0x7F7F7F7FU, new NormalizedByte4(Vector4.One).PackedValue);
            Assert.Equal(0x81818181, new NormalizedByte4(-Vector4.One).PackedValue);
        }

        [Fact]
        public void NormalizedByte4_ToVector4()
        {
            Assert.Equal(Vector4.One, new NormalizedByte4(Vector4.One).ToVector4());
            Assert.Equal(Vector4.Zero, new NormalizedByte4(Vector4.Zero).ToVector4());
            Assert.Equal(-Vector4.One, new NormalizedByte4(-Vector4.One).ToVector4());
            Assert.Equal(Vector4.One, new NormalizedByte4(Vector4.One * 1234.0f).ToVector4());
            Assert.Equal(-Vector4.One, new NormalizedByte4(Vector4.One * -1234.0f).ToVector4());
        }

        [Fact]
        public void NormalizedByte4_ToScaledVector4()
        {
            // arrange
            var short4 = new NormalizedByte4(-Vector4.One);

            // act
            Vector4 actual = short4.ToScaledVector4();

            // assert
            Assert.Equal(0, actual.X);
            Assert.Equal(0, actual.Y);
            Assert.Equal(0, actual.Z);
            Assert.Equal(0, actual.W);
        }

        [Fact]
        public void NormalizedByte4_FromScaledVector4()
        {
            // arrange
            var pixel = default(NormalizedByte4);
            Vector4 scaled = new NormalizedByte4(-Vector4.One).ToScaledVector4();
            uint expected = 0x81818181;

            // act
            pixel.FromScaledVector4(scaled);
            uint actual = pixel.PackedValue;

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

        [Fact]
        public void NormalizedByte4_FromArgb32()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromArgb32(new Argb32(255, 255, 255, 255));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromBgr24()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromBgr24(new Bgr24(byte.MaxValue, byte.MaxValue, byte.MaxValue));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromGrey8()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromL8(new L8(byte.MaxValue));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromGrey16()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromL16(new L16(ushort.MaxValue));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromRgb24()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromRgb24(new Rgb24(byte.MaxValue, byte.MaxValue, byte.MaxValue));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromRgba32()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromRgba32(new Rgba32(255, 255, 255, 255));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromBgra5551()
        {
            // arrange
            var normalizedByte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            normalizedByte4.FromBgra5551(new Bgra5551(1.0f, 1.0f, 1.0f, 1.0f));

            // assert
            Assert.Equal(expected, normalizedByte4.ToVector4());
        }

        [Fact]
        public void NormalizedByte4_FromRgb48()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromRgb48(new Rgb48(ushort.MaxValue, ushort.MaxValue, ushort.MaxValue));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_FromRgba64()
        {
            // arrange
            var byte4 = default(NormalizedByte4);
            Vector4 expected = Vector4.One;

            // act
            byte4.FromRgba64(new Rgba64(ushort.MaxValue, ushort.MaxValue, ushort.MaxValue, ushort.MaxValue));

            // assert
            Assert.Equal(expected, byte4.ToScaledVector4());
        }

        [Fact]
        public void NormalizedByte4_ToRgba32()
        {
            // arrange
            var byte4 = new NormalizedByte4(byte.MaxValue, byte.MaxValue, byte.MaxValue, byte.MaxValue);
            var expected = new Rgba32(Vector4.One);
            var actual = default(Rgba32);

            // act
            byte4.ToRgba32(ref actual);

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