require "nokogiri"

module ActiveMerchant #:nodoc:
  module Billing #:nodoc:
    class HpsGateway < Gateway
      self.live_url = 'https://posgateway.secureexchange.net/Hps.Exchange.PosGateway/PosGatewayService.asmx?wsdl'
      self.test_url = 'https://posgateway.cert.secureexchange.net/Hps.Exchange.PosGateway/PosGatewayService.asmx?wsdl'

      self.supported_countries = ['US']
      self.default_currency = 'USD'
      self.supported_cardtypes = [:visa, :master, :american_express, :discover, :jbc, :diners_club]

      self.homepage_url = 'http://developer.heartlandpaymentsystems.com/SecureSubmit/'
      self.display_name = 'Heartland Payment Systems'

      self.money_format = :dollars

      def initialize(options={})
        requires!(options, :secret_api_key)
        super
      end

      def authorize(money, card_or_token, options={})
        commit('CreditAuth') do |xml|
          add_amount(xml, money)
          add_allow_dup(xml)
          add_customer_data(xml, card_or_token, options)
          add_details(xml, options)
          add_descriptor_name(xml, options)
          add_payment(xml, card_or_token, options)
        end
      end

      def capture(money, transaction_id, options={})
        commit('CreditAddToBatch') do |xml|
          add_amount(xml, money)
          add_reference(xml, transaction_id)
        end
      end

      def purchase(money, card_or_token, options={})
        commit('CreditSale') do |xml|
          add_amount(xml, money)
          add_allow_dup(xml)
          add_customer_data(xml, card_or_token,options)
          add_details(xml, options)
          add_descriptor_name(xml, options)
          add_payment(xml, card_or_token, options)
        end
      end

      def refund(money, transaction_id, options={})
        commit('CreditReturn') do |xml|
          add_amount(xml, money)
          add_allow_dup(xml)
          add_reference(xml, transaction_id)
          add_customer_data(xml, transaction_id,options)
          add_details(xml, options)
        end
      end

      def verify(card_or_token, options={})
        commit('CreditAccountVerify') do |xml|
          add_customer_data(xml, card_or_token, options)
          add_descriptor_name(xml, options)
          add_payment(xml, card_or_token, options)
        end
      end

      def void(transaction_id, options={})
        commit('CreditVoid') do |xml|
          add_reference(xml, transaction_id)
        end
      end

      private

      def add_reference(xml, transaction_id)
        xml.hps :GatewayTxnId, transaction_id
      end

      def add_amount(xml, money)
        xml.hps :Amt, amount(money) if money
      end

      def add_customer_data(xml, credit_card, options)
        xml.hps :CardHolderData do
          if credit_card.respond_to?(:number)
            xml.hps :CardHolderFirstName, credit_card.first_name if credit_card.first_name
            xml.hps :CardHolderLastName, credit_card.last_name if credit_card.last_name
          end

          xml.hps :CardHolderEmail, options[:email] if options[:email]
          xml.hps :CardHolderPhone, options[:phone] if options[:phone]

          if(billing_address = (options[:billing_address] || options[:address]))
            xml.hps :CardHolderAddr, billing_address[:address1] if billing_address[:address1]
            xml.hps :CardHolderCity, billing_address[:city] if billing_address[:city]
            xml.hps :CardHolderState, billing_address[:state] if billing_address[:state]
            xml.hps :CardHolderZip, billing_address[:zip] if billing_address[:zip]
          end
        end
      end

      def add_payment(xml, card_or_token, options)
        xml.hps :CardData do
          if card_or_token.respond_to?(:number)
            if card_or_token.track_data
              xml.tag!("hps:TrackData", 'method'=>'swipe') do
                xml.text! card_or_token.track_data
              end
              if options[:encryption_type]
                xml.hps :EncryptionData do
                  xml.hps :Version, options[:encryption_type]
                  if options[:encryption_type] == '02'
                    xml.hps :EncryptedTrackNumber, options[:encrypted_track_number]
                    xml.hps :KTB, options[:ktb]
                  end
                end
              end
            else
              xml.hps :ManualEntry do
                xml.hps :CardNbr, card_or_token.number
                xml.hps :ExpMonth, card_or_token.month
                xml.hps :ExpYear, card_or_token.year
                xml.hps :CVV2, card_or_token.verification_value if card_or_token.verification_value
                xml.hps :CardPresent, 'N'
                xml.hps :ReaderPresent, 'N'
              end
            end
          else
            xml.hps :TokenData do
              xml.hps :TokenValue, card_or_token
            end
          end
          xml.hps :TokenRequest, (options[:store] ? 'Y' : 'N')
        end
      end

      def add_details(xml, options)
        xml.hps :AdditionalTxnFields do
          xml.hps :Description, options[:description] if options[:description]
          xml.hps :InvoiceNbr, options[:order_id] if options[:order_id]
          xml.hps :CustomerID, options[:customer_id] if options[:customer_id]
        end
      end

      def add_allow_dup(xml)
        xml.hps :AllowDup, 'Y'
      end

      def add_descriptor_name(xml, options)
        xml.hps :TxnDescriptor, options[:descriptor_name] if options[:descriptor_name]
      end

      def build_request(action)
        xml = Builder::XmlMarkup.new(encoding: 'UTF-8')
        xml.instruct!(:xml, encoding: 'UTF-8')
        xml.SOAP :Envelope, {
            'xmlns:SOAP' => 'http://schemas.xmlsoap.org/soap/envelope/',
            'xmlns:hps' => 'http://Hps.Exchange.PosGateway' } do
          xml.SOAP :Body do
            xml.hps :PosRequest do
              xml.hps 'Ver1.0'.to_sym do
                xml.hps :Header do
                  xml.hps :SecretAPIKey, @options[:secret_api_key]
                  xml.hps :DeveloperID, @options[:developer_id] if @options[:developer_id]
                  xml.hps :VersionNbr, @options[:version_number] if @options[:version_number]
                  xml.hps :SiteTrace, @options[:site_trace] if @options[:site_trace]
                end
                xml.hps :Transaction do
                  xml.hps action.to_sym do
                    if %w(CreditVoid CreditAddToBatch).include?(action)
                      yield(xml)
                    else
                      xml.hps :Block1 do
                        yield(xml)
                      end
                    end
                  end
                end
              end
            end
          end
        end
        xml.target!
      end

      def parse(raw)
        response = {}

        doc = Nokogiri::XML(raw)
        doc.remove_namespaces!
        if(header = doc.xpath("//Header").first)
          header.elements.each do |node|
            if (node.elements.size == 0)
              response[node.name] = node.text
            else
              node.elements.each do |childnode|
                response[childnode.name] = childnode.text
              end
            end
          end
        end
        if(transaction = doc.xpath("//Transaction/*[1]").first)
          transaction.elements.each do |node|
            response[node.name] = node.text
          end
        end
        if(fault = doc.xpath("//Fault/Reason/Text").first)
          response["Fault"] = fault.text
        end

        response
      end

      def commit(action, &request)
        data = build_request(action, &request)

        response = begin
          parse(ssl_post((test? ? test_url : live_url), data, 'Content-type' => 'text/xml'))
        rescue ResponseError => e
          parse(e.response.body)
        end

        ActiveMerchant::Billing::Response.new(
          successful?(response),
          message_from(response),
          response,
          test: test?,
          authorization: authorization_from(response),
          avs_result: {
            code: response['AVSRsltCode'],
            message: response['AVSRsltText']
          },
          cvv_result: response['CVVRsltCode']
        )
      end

      def successful?(response)
        (
          (response["GatewayRspCode"] == "0") &&
          ((response["RspCode"] || "00") == "00" || response["RspCode"] == "85")
        )
      end

      def message_from(response)
        if(response["Fault"])
          response["Fault"]
        elsif(response["GatewayRspCode"] == "0")
          if(response["RspCode"] != "00" && response["RspCode"] != "85")
            issuer_message(response["RspCode"])
          else
            response['GatewayRspMsg']
          end
        else
          (GATEWAY_MESSAGES[response["GatewayRspCode"]] || response["GatewayRspMsg"])
        end
      end

      def authorization_from(response)
        response['GatewayTxnId']
      end

      def test?
        (@options[:secret_api_key] && @options[:secret_api_key].include?('_cert_'))
      end

      ISSUER_MESSAGES = {
        "13" => "Must be greater than or equal 0.",
        "14" => "The card number is incorrect.",
        "54" => "The card has expired.",
        "55" => "The 4-digit pin is invalid.",
        "75" => "Maximum number of pin retries exceeded.",
        "80" => "Card expiration date is invalid.",
        "86" => "Can't verify card pin number."
      }
      def issuer_message(code)
        return "The card was declined." if %w(02 03 04 05 41 43 44 51 56 61 62 63 65 78).include?(code)
        return "An error occurred while processing the card." if %w(06 07 12 15 19 12 52 53 57 58 76 77 91 96 EC).include?(code)
        return "The card's security code is incorrect." if %w(EB N7).include?(code)
        ISSUER_MESSAGES[code]
      end

      GATEWAY_MESSAGES = {
        "-2" => "Authentication error. Please double check your service configuration.",
        "12" => "Invalid CPC data.",
        "13" => "Invalid card data.",
        "14" => "The card number is not a valid credit card number.",
        "30" => "Gateway timed out."
      }
    end
  end
end