require "isodoc"
require_relative "metadata"
require "fileutils"
require_relative "base_convert"

module IsoDoc
  module NIST
    # A {Converter} implementation that generates HTML output, and a document
    # schema encapsulation of the document for validation
    class HtmlConvert < IsoDoc::HtmlConvert
      def initialize(options)
        @libdir = File.dirname(__FILE__)
        super
      end

      def convert1(docxml, filename, dir)
        @bibliographycount = docxml.xpath(ns("//references")).size
        super
      end

      def default_fonts(options)
        {
          bodyfont: (options[:script] == "Hans" ? '"SimSun",serif' :
                     '"Libre Baskerville",serif'),
                     headerfont: (options[:script] == "Hans" ? '"SimHei",sans-serif' :
                                  '"Libre Baskerville",serif'),
                                  monospacefont: '"Space Mono",monospace'
        }
      end

      def default_file_locations(_options)
        {
          htmlstylesheet: html_doc_path("htmlstyle.scss"),
          htmlcoverpage: html_doc_path("html_nist_titlepage.html"),
          htmlintropage: html_doc_path("html_nist_intro.html"),
          scripts: html_doc_path("scripts.html"),
        }
      end

      def googlefonts
        <<~HEAD.freeze
    <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,400i,600,600i" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,300i,400,400i,600,600i|Space+Mono:400,700" rel="stylesheet" />
    <link href="https://fonts.googleapis.com/css?family=Libre+Baskerville:400,400i,700,700i" rel="stylesheet">
        HEAD
      end

      def toclevel
        ret = toclevel_classes.map do |l|
          "#{l}:not(:empty):not(.TermNum):not(.noTOC):not(.AbstractTitle):"\
            "not(.IntroTitle):not(.ForewordTitle)" 
        end
        <<~HEAD.freeze
    function toclevel() { return "#{ret.join(',')}";}
        HEAD
      end

      def html_toc(docxml)
        idx = docxml.at("//div[@id = 'toc']") or return docxml
        toc = "<ul>"
        path = toclevel_classes.map do |l|
          "//main//#{l}[not(@class = 'TermNum')][not(@class = 'noTOC')]"\
            "[text()][not(@class = 'AbstractTitle')]"\
            "[not(@class = 'IntroTitle')][not(@class = 'ForewordTitle')]"
        end
        docxml.xpath(path.join(" | ")).each_with_index do |h, tocidx|
          h["id"] ||= "toc#{tocidx}"
          toc += html_toc_entry(h.name, h)
        end
        idx.children = "#{toc}</ul>"
        docxml
      end

      def make_body(xml, docxml)
        body_attr = { lang: "EN-US", link: "blue", vlink: "#954F72",
                      "xml:lang": "EN-US", class: "container" }
        xml.body **body_attr do |body|
          make_body1(body, docxml)
          make_body2(body, docxml)
          make_body3(body, docxml)
        end
      end

      def authority_cleanup(docxml)
        dest = docxml.at("//div[@id = 'authority']") || return
        auth = docxml.at("//div[@class = 'authority']") || return
        auth.xpath(".//h1 | .//h2").each { |h| h["class"] = "IntroTitle" }
        dest1 = docxml.xpath("//div[@class = 'authority6']")
        auth1 = docxml&.at("//div[@id = 'authority6']")&.remove
        dest1 and auth1 and dest1.each { |d| d.replace(auth1) }
        dest.replace(auth.remove)
        a = docxml.at("//div[@id = 'authority1']") and a["class"] = "authority1"
        a = docxml.at("//div[@id = 'authority2']") and a["class"] = "authority2"
        a = docxml.at("//div[@id = 'authority3']") and a["class"] = "authority3"
        a = docxml.at("//div[@id = 'authority3a']") and a["class"] = "authority3"
        a = docxml.at("//div[@id = 'authority4']") and a["class"] = "authority4"
        a = docxml.at("//div[@id = 'authority5']") and a["class"] = "authority5"
        a = docxml.at("//div[@id = 'authority6']") and a["class"] = "authority6"
      end

      def cleanup(docxml)
        super
        term_cleanup(docxml)
        requirement_cleanup(docxml)
        docxml
      end

      def make_body3(body, docxml)
        body.div **{ class: "main-section" } do |div3|
          foreword docxml, div3
          abstract docxml, div3
          keywords docxml, div3
          boilerplate docxml, div3
          preface docxml, div3
          middle docxml, div3
          footnotes div3
          comments div3
        end
      end

      def termdef_parse(node, out)
        out.dl **{ class: "terms_dl" } do |dl|
          dl.dt do |dt|
            term_and_termref_parse(node, dt)
          end
          dl.dd do |dd|
            term_rest_parse(node, dd)
          end
        end
      end

      include BaseConvert
    end
  end
end