require File.dirname(__FILE__) + '/paypal/paypal_common_api'
require File.dirname(__FILE__) + '/paypal/paypal_recurring_api'
require File.dirname(__FILE__) + '/paypal_express'

module ActiveMerchant #:nodoc:
  module Billing #:nodoc:
    class PaypalGateway < Gateway
      include PaypalCommonAPI
      include PaypalRecurringApi

      self.supported_cardtypes = [:visa, :master, :american_express, :discover]
      self.supported_countries = ['US']
      self.homepage_url = 'https://www.paypal.com/us/webapps/mpp/paypal-payments-pro'
      self.display_name = 'PayPal Payments Pro (US)'

      def authorize(money, credit_card_or_referenced_id, options = {})
        requires!(options, :ip)
        commit define_transaction_type(credit_card_or_referenced_id), build_sale_or_authorization_request('Authorization', money, credit_card_or_referenced_id, options)
      end

      def purchase(money, credit_card_or_referenced_id, options = {})
        requires!(options, :ip)
        commit define_transaction_type(credit_card_or_referenced_id), build_sale_or_authorization_request('Sale', money, credit_card_or_referenced_id, options)
      end

      def verify(credit_card, options = {})
        if %w(visa master).include?(credit_card.brand)
          authorize(0, credit_card, options)
        else
          MultiResponse.run(:use_first_response) do |r|
            r.process { authorize(100, credit_card, options) }
            r.process(:ignore_result) { void(r.authorization, options) }
          end
        end
      end

      def express
        @express ||= PaypalExpressGateway.new(@options)
      end

      private

      def define_transaction_type(transaction_arg)
        if transaction_arg.is_a?(String)
          return 'DoReferenceTransaction'
        else
          return 'DoDirectPayment'
        end
      end

      def build_sale_or_authorization_request(action, money, credit_card_or_referenced_id, options)
        transaction_type = define_transaction_type(credit_card_or_referenced_id)
        reference_id = credit_card_or_referenced_id if transaction_type == "DoReferenceTransaction"

        billing_address = options[:billing_address] || options[:address]
        currency_code = options[:currency] || currency(money)

        xml = Builder::XmlMarkup.new :indent => 2
        xml.tag! transaction_type + 'Req', 'xmlns' => PAYPAL_NAMESPACE do
          xml.tag! transaction_type + 'Request', 'xmlns:n2' => EBAY_NAMESPACE do
            xml.tag! 'n2:Version', API_VERSION
            xml.tag! 'n2:' + transaction_type + 'RequestDetails' do
              xml.tag! 'n2:ReferenceID', reference_id if transaction_type == 'DoReferenceTransaction'
              xml.tag! 'n2:PaymentAction', action
              add_payment_details(xml, money, currency_code, options)
              add_credit_card(xml, credit_card_or_referenced_id, billing_address, options) unless transaction_type == 'DoReferenceTransaction'
              xml.tag! 'n2:IPAddress', options[:ip]
            end
          end
        end

        xml.target!
      end

      def add_credit_card(xml, credit_card, address, options)
        xml.tag! 'n2:CreditCard' do
          xml.tag! 'n2:CreditCardType', credit_card_type(card_brand(credit_card))
          xml.tag! 'n2:CreditCardNumber', credit_card.number
          xml.tag! 'n2:ExpMonth', format(credit_card.month, :two_digits)
          xml.tag! 'n2:ExpYear', format(credit_card.year, :four_digits)
          xml.tag! 'n2:CVV2', credit_card.verification_value

          if [ 'switch', 'solo' ].include?(card_brand(credit_card).to_s)
            xml.tag! 'n2:StartMonth', format(credit_card.start_month, :two_digits) unless credit_card.start_month.blank?
            xml.tag! 'n2:StartYear', format(credit_card.start_year, :four_digits) unless credit_card.start_year.blank?
            xml.tag! 'n2:IssueNumber', format(credit_card.issue_number, :two_digits) unless credit_card.issue_number.blank?
          end

          xml.tag! 'n2:CardOwner' do
            xml.tag! 'n2:PayerName' do
              xml.tag! 'n2:FirstName', credit_card.first_name
              xml.tag! 'n2:LastName', credit_card.last_name
            end

            xml.tag! 'n2:Payer', options[:email]
            add_address(xml, 'n2:Address', address)
          end
        end
      end

      def credit_card_type(type)
        case type
        when 'visa'             then 'Visa'
        when 'master'           then 'MasterCard'
        when 'discover'         then 'Discover'
        when 'american_express' then 'Amex'
        when 'switch'           then 'Switch'
        when 'solo'             then 'Solo'
        end
      end

      def build_response(success, message, response, options = {})
         Response.new(success, message, response, options)
      end
    end
  end
end