module IsoDoc
  class Metadata
    def extract_person_names(authors)
      authors.reduce([]) do |ret, a|
        ret << if a.at(ns("./name/completename"))
                 a.at(ns("./name/completename")).text
               else
                 extract_person_name_from_components(a)
               end
      end
    end

    def extract_person_name_from_components(person)
      name = person.xpath(ns("./name/forename"))
      name.empty? and name = person.xpath(ns("./name/formatted-initials"))
      out = name.map(&:text)
      out << person.at(ns("./name/surname"))&.text
      l10n(out.compact.join(" "))
    end

    def extract_person_affiliations(authors)
      authors.reduce([]) do |m, a|
        pos = a.at(ns("./affiliation/name"))&.text
        name = a.at(ns("./affiliation/organization/name"))&.text
        subdivs = a.xpath(ns("./affiliation/organization/subdivision"))
          &.map(&:text)&.join(", ")
        location =
          a.at(ns("./affiliation/organization/address/formattedAddress"))&.text
        m << l10n([pos, name, subdivs, location].map { |x| x&.empty? ? nil : x }
          .compact.join(", "))
        m
      end
    end

    def extract_person_names_affiliations(authors)
      names = extract_person_names(authors)
      affils = extract_person_affiliations(authors)
      ret = {}
      affils.each_with_index do |a, i|
        ret[a] ||= []
        ret[a] << names[i]
      end
      ret
    end

    def personal_authors(isoxml)
      authors = isoxml.xpath(ns("//bibdata/contributor[role/@type = 'author' " \
                                "or xmlns:role/@type = 'editor']/person"))
      set(:authors, extract_person_names(authors))
      set(:authors_affiliations, extract_person_names_affiliations(authors))
    end

    def author(xml, _out)
      personal_authors(xml)
      agency(xml)
    end

    def iso?(org)
      name = org&.at(ns("./name"))&.text
      abbrev = org&.at(ns("./abbreviation"))&.text
      abbrev == "ISO" ||
        name == "International Organization for Standardization"
    end

    def agency1(xml)
      agency = ""
      publisher = []
      xml.xpath(ns("//bibdata/contributor[xmlns:role/@type = 'publisher']/" \
                   "organization")).each do |org|
        name = org.at(ns("./name[@language = '#{@lang}']")) ||
          org.at(ns("./name"))
        agency1 = org.at(ns("./abbreviation"))&.text || name&.text
        publisher << name.text if name
        agency = iso?(org) ? "ISO/#{agency}" : "#{agency}#{agency1}/"
      end
      [agency, publisher]
    end

    def agency(xml)
      agency, publisher = agency1(xml)
      set(:agency, agency.sub(%r{/$}, ""))
      set(:publisher, @i18n.boolean_conj(publisher, "and"))
      agency_addr(xml)
    end

    def agency_addr(xml)
      a = xml.at(ns("//bibdata/contributor[xmlns:role/@type = 'publisher'][1]/" \
                    "organization")) or return
      { subdivision: "./subdivision", pub_phone: "./phone[not(@type = 'fax')]",
        pub_fax: "./phone[@type = 'fax']", pub_email: "./email",
        pub_uri: "./uri" }.each do |k, v|
          n = a.at(ns(v)) and set(k, n.text)
        end
      n = a.at(ns("./address/formattedAddress")) and
        set(:pub_address, n.children.to_xml)
    end
  end
end