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

using SixLabors.ImageSharp.Memory;
using SixLabors.ImageSharp.PixelFormats;
using Xunit.Abstractions;

namespace SixLabors.ImageSharp.Tests;

/// <summary>
/// Provides <see cref="Image{TPixel}" /> instances for parametric unit tests.
/// </summary>
/// <typeparam name="TPixel">The pixel format of the image</typeparam>
public abstract partial class TestImageProvider<TPixel> : IXunitSerializable
    where TPixel : unmanaged, IPixel<TPixel>
{
    private class SolidProvider : BlankProvider
    {
        private byte a;

        private byte b;

        private byte g;

        private byte r;

        public SolidProvider(int width, int height, byte r, byte g, byte b, byte a)
            : base(width, height)
        {
            this.r = r;
            this.g = g;
            this.b = b;
            this.a = a;
        }

        /// <summary>
        /// This parameterless constructor is needed for xUnit deserialization
        /// </summary>
        public SolidProvider()
            : base()
        {
            this.r = 0;
            this.g = 0;
            this.b = 0;
            this.a = 0;
        }

        public override string SourceFileOrDescription
            => TestUtils.AsInvariantString($"Solid{this.Width}x{this.Height}_({this.r},{this.g},{this.b},{this.a})");

        public override Image<TPixel> GetImage()
        {
            Image<TPixel> image = base.GetImage();
            Color color = Color.FromPixel(new Rgba32(this.r, this.g, this.b, this.a));

            image.GetRootFramePixelBuffer().FastMemoryGroup.Fill(color.ToPixel<TPixel>());
            return image;
        }

        public override void Serialize(IXunitSerializationInfo info)
        {
            info.AddValue("red", this.r);
            info.AddValue("green", this.g);
            info.AddValue("blue", this.b);
            info.AddValue("alpha", this.a);
            base.Serialize(info);
        }

        public override void Deserialize(IXunitSerializationInfo info)
        {
            this.r = info.GetValue<byte>("red");
            this.g = info.GetValue<byte>("green");
            this.b = info.GetValue<byte>("blue");
            this.a = info.GetValue<byte>("alpha");
            base.Deserialize(info);
        }
    }
}