ContinuityControl/ncua

module NCUA
  module CreditUnion
    class ServerError < ::StandardError; end
    class DetailsClient
      include HTTParty

      base_uri 'http://mapping.ncua.gov'
      def get_details(charter_number)
        charter_number = charter_number.to_s.strip
        if charter_number.empty?
          raise ArgumentError, "charter number cannot be nil or empty string"
        end

        if !(charter_number =~ /\A\d+\z/)
          raise ArgumentError, "charter number must contain only digits"
        end

        response = execute_query(charter_number)

        case response.code
        when 200...300
          response
        when 500...600
          raise ServerError, "the NCUA returned a #{response.code} error"
        else
          raise ServerError, "Unexpected Response: #{response.code}"
        end
      end

      private

      def endpoint
        '/SingleResult.aspx'
      end

      def execute_query(charter_number)
        self.class.get(endpoint, query: {
          "ID" => charter_number
        })
      end
    end
  end
end