using Gma.QrCodeNet.Encoding.EncodingRegion;

namespace Gma.QrCodeNet.Encoding.Masking;

public static class MatrixExtensions
{
    public static TriStateMatrix Xor(this TriStateMatrix first, Pattern second, ErrorCorrectionLevel errorLevel)
    {
        TriStateMatrix result = XorMatrix(first, second);
        result.EmbedFormatInformation(errorLevel, second);
        return result;
    }

    private static TriStateMatrix XorMatrix(TriStateMatrix first, BitMatrix second)
    {
        int width = first.Width;
        TriStateMatrix maskedMatrix = new(width);
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < width; y++)
            {
                MatrixStatus states = first.MStatus(x, y);
                switch (states)
                {
                    case MatrixStatus.NoMask:
                        maskedMatrix[x, y, MatrixStatus.NoMask] = first[x, y];
                        break;

                    case MatrixStatus.Data:
                        maskedMatrix[x, y, MatrixStatus.Data] = first[x, y] ^ second[x, y];
                        break;

                    default:
                        throw new ArgumentException($"{nameof(TriStateMatrix)} has None value cell.", nameof(first));
                }
            }
        }

        return maskedMatrix;
    }

    public static TriStateMatrix Apply(this TriStateMatrix matrix, Pattern pattern, ErrorCorrectionLevel errorLevel) => matrix.Xor(pattern, errorLevel);
}