require "isodoc"
require_relative "metadata"
require_relative "xrefs"
require_relative "refs"
require_relative "section"
require "fileutils"

module IsoDoc
  module NIST
    module BaseConvert
      def keywords(_docxml, out)
        kw = @meta.get[:keywords]
        kw.empty? and return
        out.div **{ class: "Section3" } do |div|
          clause_name(nil, "Keywords", div,  class: "IntroTitle")
          div.p kw.sort.join("; ")
        end
      end

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

      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 fileloc(loc)
        File.join(File.dirname(__FILE__), loc)
      end

      def requirement_cleanup(docxml)
        docxml.xpath("//div[@class = 'recommend' or @class = 'require' "\
                     "or @class = 'permission']").each do |d|
          title = d.at("./p[@class = 'RecommendationTitle']") or next
          title.name = "b"
          title.delete("class")
          n = title.next_element
          n&.children&.first&.add_previous_sibling(" ")
          n&.children&.first&.add_previous_sibling(title.remove)
        end
        docxml
      end

      def dl_parse(node, out)
        return glossary_parse(node, out) if node["type"] == "glossary"
        super
      end

      def glossary_parse(node, out)
        out.dl  **attr_code(id: node["id"], class: "glossary") do |v|
          node.elements.select { |n| dt_dd? n }.each_slice(2) do |dt, dd|
            v.dt **attr_code(id: dt["id"]) do |term|
              dt_parse(dt, term)
            end
            v.dd  **attr_code(id: dd["id"]) do |listitem|
              dd.children.each { |n| parse(n, listitem) }
            end
          end
        end
        node.elements.reject { |n| dt_dd? n }.each { |n| parse(n, out) }
      end

      def error_parse(node, out)
        case node.name
        when "nistvariable" then nistvariable_parse(node, out)
        when "recommendation" then recommendation_parse(node, out)
        when "requirement" then requirement_parse(node, out)
        when "permission" then permission_parse(node, out)
        when "errata" then errata_parse(node, out)
        else
          super
        end
      end

      def boilerplate(node, out)
        super
        page_break(out)
      end

      def children_parse(node, out)
        node.children.each do |n|
          parse(n, out)
        end
      end

      def nistvariable_parse(node, out)
        out.span **{class: "nistvariable"} do |s|
          node.children.each { |n| parse(n, s) }
        end
      end

      def errata_parse(node, out)
        out.a **{ name: "errata_XYZZY" }
        out.table **table_attrs(node) do |t|
          errata_head(t)
          errata_body(t, node)
        end
      end

      def errata_head(t)
        t.thead do |h|
          h.tr do |tr|
            %w(Date Type Change Pages).each do |hdr|
              tr.th hdr
            end
          end
        end
      end

      def errata_body(t, node)
        t.tbody do |b|
          node.xpath(ns("./row")).each do |row|
            b.tr do |tr|
              %w{date type change pages}.each do |hdr|
                tr.td do |td|
                  row&.at(ns("./#{hdr}"))&.children.each do |n|
                    parse(n, td)
                  end
                end
              end
            end
          end
        end
      end

      MIDDLE_CLAUSE = "//clause[parent::sections] | "\
        "//terms[parent::sections]".freeze

      def middle(isoxml, out)
        middle_admonitions(isoxml, out)
        clause isoxml, out
        bibliography isoxml, out
        annex isoxml, out
      end

      def info(isoxml, out)
        @meta.series isoxml, out
        @meta.commentperiod isoxml, out
        @meta.note isoxml, out
        super
      end

      def wrap_brackets(txt)
        return txt if /^\[.*\]$/.match txt
        "[#{txt}]"
      end

      def get_linkend(node)
        link = anchor_linkend(node, docid_l10n(node["target"] || 
                                               wrap_brackets(node['citeas'])))
        link += eref_localities(node.xpath(ns("./locality | ./localityStack")),
                                link)
        contents = node.children.select do |c|
          !%w{locality localityStack}.include? c.name 
        end
        return link if contents.nil? || contents.empty?
        Nokogiri::XML::NodeSet.new(node.document, contents).to_xml
      end

      def load_yaml(lang, script)
        y = if @i18nyaml then YAML.load_file(@i18nyaml)
            elsif lang == "en"
              YAML.load_file(File.join(File.dirname(__FILE__), "i18n-en.yaml"))
            else
              YAML.load_file(File.join(File.dirname(__FILE__), "i18n-en.yaml"))
            end
        super.merge(y)
      end

      def terms_parse(node, out)
        out.div **attr_code(id: node["id"]) do |div|
          node.at(ns("./title")) and
            clause_parse_title(node, div, node.at(ns("./title")), out)
          node.elements.each do |e|
            parse(e, div) unless %w{title source}.include? e.name
          end
        end
      end

      def termref_parse(node, out)
      end

      def term_cleanup(docxml)
        docxml.xpath("//table[@class = 'terms_dl']").each do |d|
          prev = d.previous_element
          next unless prev && prev.name == "table" &&
            prev["class"] == "terms_dl"
          d.children.each { |n| prev.add_child(n.remove) }
          d.remove
        end
        docxml
      end

      def term_and_termref_parse(node, dt)
        pref = node.at(ns("./preferred"))
        source = node.xpath(ns("./termsource"))
        pref.children.each { |n| parse(n, dt) }
        return if source.empty?
        dt << "<br/>"
        source.each_with_index do |s, i|
          i > 0 and dt << "; "
          s.elements.each { |n| parse(n, dt) }
        end
      end

      def term_rest_parse(node, dd)
        set_termdomain("")
        node.children.each do |n|
          parse(n, dd) unless %w(preferred termsource).include?(n.name)
        end
      end

      def modification_parse(node, out)
        out << @modified_lbl
        node.at(ns("./p[text()[normalize-space() != '']]")) and
          out << " &mdash; "
        node.at(ns("./p")).children.each { |n| parse(n, out) }
      end
    end
  end
end