module IsoDoc
  module NIST
    module BaseConvert
      def keywords(docxml, out)
        f = docxml.at(ns("//preface/clause[@type = 'keyword']")) || return
        preface1(f, f&.at(ns("./title")), false, out)
      end

      def skip_render(c, isoxml)
        return false unless c.name == "reviewernote"
        status = isoxml&.at(ns("//bibdata/status/stage"))&.text
        return true if status.nil?
        /^final/.match status
      end

      def abstract(isoxml, out)
        f = isoxml.at(ns("//preface/abstract")) || return
        out.div **attr_code(id: f["id"]) do |s|
          clause_name(nil, f.at(ns("./title")) || @i18n.abstract, s, 
                      class: "AbstractTitle")
          f.elements.each { |e| parse(e, s) unless e.name == "title" }
        end
      end

      FRONT_CLAUSE = "//*[parent::preface][not(local-name() = 'abstract' or "\
        "local-name() = 'foreword' or @type = 'keyword')]".freeze

      # All "[preface]" sections should have class "IntroTitle" to prevent
      # page breaks, but for the Exec Summary
      def preface(isoxml, out)
        isoxml.xpath(ns(FRONT_CLAUSE)).each do |c|
          next if skip_render(c, isoxml) || !is_clause?(c.name)
          title = c&.at(ns("./title"))
          patent = ["Call for Patent Claims",
                    "Patent Disclosure Notice"].include? title&.text
          preface1(c, title, patent, out)
        end
      end

      def preface1(c, title, patent, out)
        out.div **attr_code(id: c["id"]) do |s|
          page_break(s) if patent
          clause_name(nil, title, s,
                      class: (c.name == "executivesummary") ? "NormalTitle" :
                      "IntroTitle")
          c.elements.reject { |c1| c1.name == "title" }.each do |c1|
            parse(c1, s)
          end
        end
      end

      def foreword(isoxml, out)
        f = isoxml.at(ns("//foreword")) || return
        out.div **attr_code(id: f["id"]) do |s|
          title = f.at(ns("./title"))
          s.h1(**{ class: "ForewordTitle" }) do |h1|
            title and title.children.each { |e| parse(e, h1) }
          end
          f.elements.each { |e| parse(e, s) unless e.name == "title" }
        end
      end

      def is_clause?(name)
        return true if %w(reviewernote executivesummary).include? name
        super
      end
    end
  end
end