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

module IsoDoc
  module Mpfd
    # A {Converter} implementation that generates Word output, and a document
    # schema encapsulation of the document for validation
    class WordConvert < IsoDoc::WordConvert
      def rsd_html_path(file)
        File.join(File.dirname(__FILE__), File.join("html", file))
      end

      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' : '"Arial",sans-serif'),
          headerfont: (options[:script] == "Hans" ? '"SimHei",sans-serif' : '"Arial",sans-serif'),
          monospacefont: '"Courier New",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: html_doc_path("scripts.html"),
          wordstylesheet: html_doc_path("wordstyle.scss"),
          standardstylesheet: html_doc_path("rsd.scss"),
          header: html_doc_path("header.html"),
          wordcoverpage: html_doc_path("word_rsd_titlepage.html"),
          wordintropage: html_doc_path("word_rsd_intro.html"),
          ulstyle: "l3",
          olstyle: "l2",
        }
      end

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

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

      def make_body2(body, docxml)
        body.div **{ class: "WordSection2" } do |div2|
          info docxml, div2
          div2.p { |p| p << "&nbsp;" } # placeholder
        end
        #body.br **{ clear: "all", style: "page-break-before:auto;mso-break-type:section-break;" }
        section_break(body)
      end

      def title(isoxml, _out)
        main = isoxml&.at(ns("//title[@language='en']"))&.text
        set_metadata(:doctitle, main)
      end

      def generate_header(filename, dir)
        return unless @header
        template = Liquid::Template.parse(File.read(@header, encoding: "UTF-8"))
        meta = @meta.get
        meta[:filename] = filename
        params = meta.map { |k, v| [k.to_s, v] }.to_h
        File.open("header.html", "w") { |f| f.write(template.render(params)) }
        @files_to_delete << "header.html"
        "header.html"
      end

      def header_strip(h)
        h = h.to_s.gsub(%r{<br/>}, " ").sub(/<\/?h[12][^>]*>/, "")
        h1 = to_xhtml_fragment(h.dup)
        h1.traverse do |x|
          x.replace(" ") if x.name == "span" &&
            /mso-tab-count/.match(x["style"])
          x.remove if x.name == "span" && x["class"] == "MsoCommentReference"
          x.remove if x.name == "a" && x["epub:type"] == "footnote"
          x.replace(x.children) if x.name == "a"
        end
        from_xhtml(h1)
      end

      def info(isoxml, out)
        @meta.security isoxml, out
        super
      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 term_defs_boilerplate(div, source, term, preface)
        if source.empty? && term.nil?
          div << @no_terms_boilerplate
        else
          div << term_defs_boilerplate_cont(source, term)
        end
      end

      def i18n_init(lang, script)
        super
        @annex_lbl = "Appendix"
      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-zh-Hans.yaml"))
            end
        @labels = @labels.merge(y)
        @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


      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" 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 initial_anchor_names(d)
        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 middle(isoxml, out)
        middle_title(out)
        clause isoxml, out
        annex isoxml, out
        bibliography isoxml, out
      end

      def make_body2(body, docxml)
        body.div **{ class: "WordSection2" } do |div2|
          info docxml, div2
          foreword docxml, div2
          introduction docxml, div2
          terms_defs docxml, div2, 0
          div2.p { |p| p << "&nbsp;" } # placeholder
        end
        section_break(body)
      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 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+1
        else
          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
          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|
          i = annex_naming(c, num, 1, i)
        end
        hierarchical_asset_names(clause, num)
      end

      def annex_names1(clause, num, level)
        @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