using System;

namespace Misaki.ArtToolEditor
{
    internal enum TextureChannel
    {
        None,
        R,
        G,
        B,
        A
    }

    internal static class TextureChannelHelpers
    {
        private static readonly ArgumentException _channelNoneException = new("Channel is none");

        public static int ToColorIndex(this TextureChannel channel)
        {
            return channel switch
            {
                TextureChannel.None => throw _channelNoneException,
                TextureChannel.R => 0,
                TextureChannel.G => 1,
                TextureChannel.B => 2,
                TextureChannel.A => 3,
                _ => throw _channelNoneException
            };
        }
    }
}