# coding: utf-8
require 'stringex'

module Mabmapper
  module MabXml
    class Document
      include QueryHelper

      attr_accessor :xml

      def initialize(contents)
        @xml = Nokogiri::XML(contents)
        @xml.remove_namespaces!
      end

      #
      # Returns the contents of a MAB control field as an array.
      #
      def controlfield(name)
        xpath  = "//controlfield[@tag='#{name}']"
        result = @xml.at_xpath(xpath).try(:text)
        result.present? ? result.chars.to_a.map{|e| (e=='|') ? nil : e} : []
      end

      # Normalize text based on the NACO rules
      def naco_normalization(value)
        return unless value.present?

        # Downcase everything
        value.downcase!

        # Convert unicode [and accented ASCII] characters to their
        # plain-text ASCII equivalents
        Stringex::Localization.backend = :internal
        Stringex::Localization.locale = :de
        Stringex::Localization.store_translations(:de, :transliterations, {"ü" => "ue", "ä" => "ae", "ö" => "oe", "ß" => "ss"}) if Stringex::Localization.backend.translations.blank?
        value = value.to_ascii

        # Convert special chars to spaces
        value.gsub!(/[,$~^%*\/?@.:;<>{}!\(\)\-]/, ' ')

        # Convert special chars to spaces
        value.gsub!(/[\[\]\|]/, '')

        # Remove leading and trailing spaces
        value.strip!

        # Condense multiple spaces
        value.gsub!(/\s+/, ' ')

        value
      end
    end
  end
end