class PaymentechOrbitalResponse
  cattr_accessor :elements
  attr_reader :doc, :request_type

  self.elements = [ 
    :industry_type, :message_type, :merchant_id,
    :terminal_id, :card_brand, :account_num, 
    :order_id, :tx_ref_num, :tx_ref_idx, :proc_status,
    :approval_status, :resp_code, :avs_resp_code,
    :cvv2_resp_code, :auth_code, :status_msg, :resp_msg,
    :customer_ref_num, :customer_name, :profile_proc_status,
    :customer_profile_message, :resp_time, :batch_seq_num
  ]

  def initialize(doc, request_type, options={})
    @doc = REXML::Document.new(doc)
    @request_type = request_type
    @options = options
  end

  def success?
    case request_type
    when "NewOrder"
      proc_success? && approved?
    when "Profile"
      profile_proc_success?
    when "Reversal", "EndOfDay"
      proc_success?
    else
      false
    end
  end

  def proc_success?
    proc_status == "0"
  end
  
  def profile_proc_success?
    profile_proc_status == "0"
  end

  def approved?
    approval_status == "1"
  end

  def authorization
    approval_status
  end

  def test?
    @options[:test] || false
  end

  def avs_result
    @avs_result ||= AVSResult.new({:code => avs_resp_code})
  end

  def cvv_result
    @cvv_result ||= CVVResult.new({:code => cvv2_result_code})
  end

  def to_xml
    unless @_xml
      @_xml = ""
      doc.write(@_xml, 2)
    end
    @_xml
  end

  private
  def tagify(s)
    s.to_s.gsub(/\/(.?)/) { 
      "::#{$1.upcase}" 
    }.gsub(/(?:^|_)(.)/) { 
      $1.upcase 
    }
  end

  def value_at(sym)
    node = REXML::XPath.first(@doc, "//#{tagify(sym)}")
    node ? node.text : nil
  end

  def method_missing(sym, *args, &blk)
    if self.class.elements.include?(sym)
      value_at(sym)
    else
      super(sym, *args, &blk)
    end
  end
end