module RelatonJis
  module Bibliography
    extend self

    SOURCE = "https://webdesk.jsa.or.jp/books/W11M".freeze

    #
    # Search JIS by keyword
    #
    # @param [String] code JIS documetnt code
    # @param [String, nil] year JIS document year
    #
    # @return [RelatonJis::HitCollection] search result
    #
    def search(code, year = nil)
      agent = Mechanize.new
      resp = agent.post "#{SOURCE}0010/searchByKeyword", search_type: "JIS", keyword: code
      disp = JSON.parse resp.body
      # raise RelatonBib::RequestError, "No results found for #{code}" if disp["disp_screen"].nil?
      return if disp["disp_screen"].nil?

      result = agent.get "#{SOURCE}#{disp['disp_screen']}/index"
      HitCollection.new code, year, result: result.xpath("//div[@class='blockGenaral']")
    end

    #
    # Get JIS document by reference
    #
    # @param [String] ref JIS document reference
    # @param [String] year JIS document year
    # @param [Hash] opts options
    # @option opts [String] :all_parts return all parts of document
    #
    # @return [RelatonJis::BibliographicItem, nil] JIS document
    #
    def get(ref, year = nil, opts = {}) # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
      code = ref.sub(/\s\((all parts|規格群)\)/, "")
      opts[:all_parts] ||= !$1.nil?
      warn "[relaton-jis] (\"#{ref}\") fetching..."
      hits = search(code, year)
      unless hits
        hint [], ref, year
        return
      end
      result = opts[:all_parts] ? hits.find_all_parts : hits.find
      if result.is_a? RelatonJis::BibliographicItem
        warn "[relaton-jis] (\"#{ref}\") found #{result.docidentifier[0].id}"
        return result
      end
      hint result, ref, year
    end

    #
    # Log hint message
    #
    # @param [Array] result search result
    # @param [String] ref reference to search
    # @param [String, nil] year year to search
    #
    def hint(result, ref, year)
      warn "[relaton-jis] (\"#{ref}\") not found. The identifier must be " \
           "exactly as shown on the webdesk.jsa.or.jp website."
      if result.any?
        warn "[relaton-jis] (\"#{ref}\") TIP: No match for edition " \
             "year #{year}, but matches exist for #{result.uniq.join(', ')}."
      end
    end
  end
end