class RuboCop::ConfigValidator

def suggestion(name)
  registry = Cop::Registry.global
  departments = registry.departments.map(&:to_s)
  suggestions = NameSimilarity.find_similar_names(name, departments + registry.map(&:cop_name))
  if suggestions.any?
    "Did you mean `#{suggestions.join('`, `')}`?"
  else
    # Department names can contain slashes, e.g. Chef/Correctness, but there's no support for
    # the concept of higher level departments in RuboCop. It's a flat structure. So if the user
    # tries to configure a "top level department", we hint that it's the bottom level
    # departments that should be configured.
    suggestions = departments.select { |department| department.start_with?("#{name}/") }
    "#{name} is not a department. Use `#{suggestions.join('`, `')}`." if suggestions.any?
  end
end