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

namespace StitchATon2.Infra;

[StructLayout(LayoutKind.Sequential)]
public record struct Int32Pixel
{
    public static int Size
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get => Unsafe.SizeOf<Int32Pixel>();
    }

    public static Int32Pixel Zero
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get => new();
    }
    
    public int R;
    public int G;
    public int B;

    public Int32Pixel(int r, int g, int b)
    {
        R = r;
        G = g;
        B = b;
    }

    public void Accumulate(Int32Pixel pixel)
    {
        R += pixel.R;
        G += pixel.G;
        B += pixel.B;
    }

    public void Accumulate(Rgb24 pixel)
    {
        R += pixel.R;
        G += pixel.G;
        B += pixel.B;
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static Int32Pixel operator +(Int32Pixel a, Int32Pixel b)
    {
        return new Int32Pixel(a.R + b.R, a.G + b.G, a.B + b.B);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static Int32Pixel operator +(Int32Pixel a, int b)
    {
        return new Int32Pixel(a.R + b, a.G + b, a.B + b);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static Int32Pixel operator -(Int32Pixel a, Int32Pixel b)
    {
        return new Int32Pixel(a.R - b.R, a.G - b.G, a.B - b.B);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static Int32Pixel operator /(Int32Pixel a, int b)
    {
        return new Int32Pixel(a.R / b, a.G / b, a.B / b);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static explicit operator Int32Pixel(Rgb24 pixel)
    {
        return new  Int32Pixel(pixel.R, pixel.G, pixel.B);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static explicit operator Rgb24(Int32Pixel pixel)
    {
        return new  Rgb24((byte)pixel.R, (byte)pixel.G, (byte)pixel.B);
    }
}