require "iev/version"
require "open-uri"
require "nokogiri"

module Iev
  #
  # Scrape Electropedia for term.
  #
  # @param [String] code for example "103-01-02"
  # @param [String] lang language code, for examle "en"
  #
  # @return [String, nil] if found than term, if code not found then empty string,
  #   if langguage not fiund then nil.
  #
  def self.get(code, lang)
    url = "http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=#{code}"
    doc = Nokogiri::HTML OpenURI.open_uri(url), nil, "UTF-8"
    xpath = "//table/tr/td/div/font[.=\"#{lang}\"]/../../following-sibling::td[2]"
    doc.at(xpath)&.text&.strip
  end
end