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

module IsoDoc
  module Mpfd
    # A {Converter} implementation that generates PDF HTML output, and a
    # document schema encapsulation of the document for validation
    class PdfConvert < IsoDoc::PdfConvert
      def initialize(options)
        @libdir = File.dirname(__FILE__)
        super
        FileUtils.cp html_doc_path("logo.jpg"), "logo.jpg"
        FileUtils.cp html_doc_path('mpfa-logo-no-text@4x.png'), "mpfa-logo-no-text@4x.png"
        @files_to_delete << "logo.jpg"
        @files_to_delete << "mpfa-logo-no-text@4x.png"
      end

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

      def default_file_locations(_options)
        {
          htmlstylesheet: html_doc_path("htmlstyle.scss"),
          htmlcoverpage: html_doc_path("html_rsd_titlepage.html"),
          htmlintropage: html_doc_path("html_rsd_intro.html"),
          scripts_pdf: html_doc_path("scripts.pdf.html"),
        }
      end

      def metadata_init(lang, script, labels)
        @meta = Metadata.new(lang, script, labels)
      end

      def html_head()
        <<~HEAD.freeze
        <title>{{ doctitle }}</title>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

    <!--TOC script import-->
    <script type="text/javascript"  src="https://cdn.rawgit.com/jgallen23/toc/0.3.2/dist/toc.min.js"></script>

    <!--Google fonts-->
    <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=Overpass:300,300i,600,900" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Titillium+Web:400,400i,700,700i" rel="stylesheet">
    <!--Font awesome import for the link icon-->
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.8/css/solid.css" integrity="sha384-v2Tw72dyUXeU3y4aM2Y0tBJQkGfplr39mxZqlTBDUZAb9BGoC40+rdFCG0m10lXk" crossorigin="anonymous">
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.8/css/fontawesome.css" integrity="sha384-q3jl8XQu1OpdLgGFvNRnPdj5VIlCvgsDQTQB6owSOHWlAurxul7f+JpUOVdAiJ5P" crossorigin="anonymous">
<style class="anchorjs"></style>
        HEAD
      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 html_toc(docxml)
        docxml
      end

      def annex_name(annex, name, div)
        div.h1 **{ class: "Annex" } do |t|
          t << "#{get_anchors[annex['id']][:label]} "
          t.b do |b|
            name&.children&.each { |c2| parse(c2, b) }
          end
        end
      end

      def pre_parse(node, out)
        out.pre node.text # content.gsub(/</, "&lt;").gsub(/>/, "&gt;")
      end

      def error_parse(node, out)
        # catch elements not defined in ISO
        case node.name
        when "pre"
          pre_parse(node, out)
        when "keyword"
          out.span node.text, **{ class: "keyword" }
        else
          super
        end
      end

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

      def i18n_init(lang, script)
        super
        y = if lang == "en"
              YAML.load_file(File.join(File.dirname(__FILE__), "i18n-en.yaml"))
            elsif lang == "zh" && script == "Hans"
              YAML.load_file(File.join(File.dirname(__FILE__),
                                       "i18n-zh-Hans.yaml"))
            else
              YAML.load_file(File.join(File.dirname(__FILE__), "i18n-en.yaml"))
            end
        @labels = @labels.merge(y)
        @annex_lbl = y["annex"]
        @clause_lbl = y["clause"]
      end

      def terms_defs_title(f)
        return f&.at(ns("./title"))&.content
      end

      TERM_CLAUSE = "//preface/terms | "\
        "//preface/clause[descendant::terms]".freeze

      SECTIONS_XPATH =
         "//foreword | //introduction | //preface/terms | //preface/clause | //annex | "\
      "//sections/clause | //bibliography/references | "\
      "//bibliography/clause".freeze

      def terms_defs(isoxml, out, num)
        f = isoxml.at(ns(TERM_CLAUSE)) or return num
        out.div **attr_code(id: f["id"]) do |div|
          clause_name(nil, terms_defs_title(f), div, nil)
          f.elements.each do |e|
            parse(e, div) unless %w{title source}.include? e.name
          end
        end
        num
      end

      FRONT_CLAUSE = "//*[parent::preface]".freeze
      #FRONT_CLAUSE = "//clause[parent::preface] | //terms[parent::preface]".freeze

      def preface(isoxml, out)
        isoxml.xpath(ns(FRONT_CLAUSE)).each do |c|
          if c.name == "terms" || c.at(ns(".//terms")) then  terms_defs isoxml, out, 0
          else
            out.div **attr_code(id: c["id"]) do |s|
              clause_name(get_anchors[c['id']][:label],
                          c&.at(ns("./title"))&.content, s, nil)
              c.elements.reject { |c1| c1.name == "title" }.each do |c1|
                parse(c1, s)
              end
            end
          end
        end
      end

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

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

      def termdef_parse(node, out)
        set_termdomain("")
        node.children.each { |n| parse(n, out) }
      end

      def initial_anchor_names(d)
        #preface_names(d.at(ns("//foreword")))
        #preface_names(d.at(ns("//introduction")))
        #preface_names(d.at(ns("//preface/terms | "\
        #"//preface/clause[descendant::terms]")))
        d.xpath(ns(FRONT_CLAUSE)).each do |c|
          preface_names(c)
          sequential_asset_names(c)
        end
        middle_section_asset_names(d)
        clause_names(d, 0)
        termnote_anchor_names(d)
        termexample_anchor_names(d)
      end

      def annex_name_lbl(clause, num)
        l10n("<b>#{@annex_lbl} #{num}</b>")
      end

      def clause_names(docxml, sect_num)
        q = "//clause[parent::sections]"
        @topnum = nil
        lvl = 0
        docxml.xpath(ns(q)).each do |c|
          container_names(c, 0)
          sect_num, lvl = sect_names(c, nil, sect_num, 0, lvl)
        end
      end

      def container_names(clause, lvl)
        if clause["container"]
          @anchors[clause["id"]] =
            { label: nil, xref: clause.at(ns("./title"))&.text, level: lvl+1 }
        end
        clause.xpath(ns("./clause | ./term  | ./terms | "\
                        "./definitions")).each do |c|
          container_names(c, clause["container"] ? lvl+1 : lvl)
        end
      end

      def sect_names(clause, num, i, lvl, prev_lvl)
        return i if clause.nil?
        curr = i
        if !clause["container"]
          retlvl = lvl
          i+=1
          curr = i
          name = num.nil? ? i.to_s : "#{num}.#{i}"
          @anchors[clause["id"]] = { label: name, xref: l10n("#{@clause_lbl} #{name}"), level: lvl+1 }
        end
        prev = lvl
        j = 0
        clause.xpath(ns("./clause | ./term  | ./terms | "\
                        "./definitions")).each do |c|
          if clause["container"]
            i, lvl = sect_names(c, num, i, lvl, lvl)
          else
            j, prev = sect_names(c, name, j, lvl+1, prev)
          end
        end
        i = j if j >0
        i = curr if lvl < prev
        [i, prev]
      end

      def annex_naming(c, num, lvl, i)
        if c["guidance"] then annex_names1(c, "#{num}E", lvl + 1)
        else
          i+= 1 unless c["container"]
          annex_names1(c, "#{num}.#{i}", lvl + 1)
        end
        i
      end

      def annex_names(clause, num)
        @anchors[clause["id"]] = { label: annex_name_lbl(clause, num),
                                   xref: "#{@annex_lbl} #{num}", level: 1 }
        i = 0
        clause.xpath(ns("./clause")).each do |c|
          container_names(c, 0)
          i = annex_naming(c, num, 1, i)
        end
        hierarchical_asset_names(clause, num)
      end

      def annex_names1(clause, num, level)
        clause["container"] or @anchors[clause["id"]] = 
          { label: num, xref: "#{@annex_lbl} #{num}", level: level }
        i = 0
        clause.xpath(ns("./clause")).each do |c|
          i = annex_naming(c, num, level, i)
        end
      end

      def clause(isoxml, out)
        isoxml.xpath(ns(MIDDLE_CLAUSE)).each do |c|
          out.div **attr_code(id: c["id"]) do |s|
            clause_name(get_anchors[c['id']][:label],
                        c&.at(ns("./title"))&.content, s, class: c["container"] ? "containerhdr" : nil )
            c.elements.reject { |c1| c1.name == "title" }.each do |c1|
              parse(c1, s)
            end
          end
        end
      end

      def clause_parse_title(node, div, c1, out)
        if node["inline-header"] == "true"
          inline_header_title(out, node, c1)
        else
          attrs = { class: node["container"] ? "containerhdr" : nil }
          div.send "h#{get_anchors[node['id']][:level]}", **attr_code(attrs) do |h|
            lbl = get_anchors[node['id']][:label]
            h << "#{lbl}. " if lbl && !@suppressheadingnumbers
            c1&.children&.each { |c2| parse(c2, h) }
          end
        end
      end

      def ol_depth(node)
        ol_style(node["type"])
      end

    end
  end
end