public static IRubiksCube Clockwise(IRubiksCube cube, IFace face)
{
return new RubiksCube(
getF: coordinate =>
{
if (coordinate.Face.Equals(face))
{
return cube[new Coordinate(coordinate.Face, Rotate(coordinate.Position))];
}
var direction = face.Diff(coordinate.Face);
if (direction != null)
{
// WTF???
var rotated = Rotate(direction);
var before = face.Neighbour(rotated);
for (int index = -1; index < 2; index++)
{
if (coordinate.Position.Equals(face.Matching(direction, index)))
{
var relative = coordinate.Face.Diff(before);
coordinate = coordinate.Travel(ref relative, count: 3);
return cube[coordinate];
}
}
}
return cube[coordinate];
});
}
public static IPosition Matching(this IFace view, IDirection direction, int index)
{
return view.Matching(direction).Edge(view.Mapping(direction) * index);
}