using System;
using Robust.Shared.Maths;
using Robust.Shared.Utility;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using Color = Robust.Shared.Maths.Color;

namespace Robust.Client.Utility
{
    public static class ImageSharpExt
    {
        public static Color ConvertImgSharp(this Rgba32 color)
        {
            return new(color.R, color.G, color.B, color.A);
        }

        public static Rgba32 ConvertImgSharp(this Color color)
        {
            return new(color.R, color.G, color.B, color.A);
        }

        /// <summary>
        ///     Blit an image into another, with the specified offset.
        /// </summary>
        /// <param name="source">The image to copy data from.</param>
        /// <param name="sourceRect">The sub section of <see cref="source"/> that will be copied.</param>
        /// <param name="destinationOffset">
        ///     The offset into <see cref="destination"/> that data will be copied into.
        /// </param>
        /// <param name="destination">The image to copy to.</param>
        /// <typeparam name="T">The type of pixel stored in the images.</typeparam>
        public static void Blit<T>(this Image<T> source, UIBox2i sourceRect,
            Image<T> destination, Vector2i destinationOffset)
            where T : unmanaged, IPixel<T>
        {
            ImageOps.Blit(source, sourceRect, destination, destinationOffset);
        }

        public static void Blit<T>(this ReadOnlySpan<T> source, int sourceWidth, UIBox2i sourceRect,
            Image<T> destination, Vector2i destinationOffset) where T : unmanaged, IPixel<T>
        {
            ImageOps.Blit(source, sourceWidth, sourceRect, destination, destinationOffset);
        }

        /// <summary>
        /// Gets a <see cref="T:System.Span`1" /> to the backing data if the backing group consists of a single contiguous memory buffer.
        /// </summary>
        /// <returns>The <see cref="T:System.Span`1" /> referencing the memory area.</returns>
        /// <exception cref="ArgumentException">Thrown if the image is not a single contiguous buffer.</exception>
        public static Span<T> GetPixelSpan<T>(this Image<T> image) where T : unmanaged, IPixel<T>
        {
            return ImageOps.GetPixelSpan(image);
        }
    }
}