module RouteTranslator::Host

def lambdas
  @lambdas ||= {}
end

def lambdas_for_locale(locale)
  lambdas[locale] ||= ->(req) { locale == RouteTranslator::Host.locale_from_host(req.host) }
end

def locale_from_host(host)
  available_locales = I18n.available_locales
  RouteTranslator.config.host_locales.find do |pattern, locale|
    host&.match?(regex_for(pattern)) && available_locales.include?(locale&.to_sym)
  end&.last&.to_sym
end

def regex_for(host_string)
  escaped = Regexp.escape(host_string).gsub('\*', '.*?').gsub('\.', '\.?')
  Regexp.new("^#{escaped}$", Regexp::IGNORECASE)
end