module ISO3166::SubdivisionMethods

def create_subdivisions(subdivision_data)
  subdivision_data.transform_values do |subdivision|
    Subdivision.new(subdivision)
  end
end

def load_data_for_alpha2(alpha2)
  file = subdivision_file_path(alpha2)
  File.exist?(file) ? YAML.load_file(file) : {}
end

def subdivision_data(alpha2)
  data = load_data_for_alpha2(alpha2)
  locales = ISO3166.configuration.locales.map(&:to_s)
  data.each_value do |subdivision|
    subdivision['translations'] = subdivision['translations'].slice(*locales)
                                                             .transform_keys(&:to_sym)
  end
  data
end

def subdivisions(alpha2)
  @subdivisions ||= {}
  @subdivisions[alpha2] ||= create_subdivisions(subdivision_data(alpha2))
end