require "fileutils"
require "base64"

module IsoDoc
  module HtmlFunction
    module Html
      def convert1(docxml, filename, dir)
        bibitem_lookup(docxml)
        noko do |xml|
          xml.html **{ lang: @lang.to_s } do |html|
            info docxml, nil
            populate_css
            html.head { |head| define_head head, filename, dir }
            make_body(html, docxml)
          end
        end.join("\n")
      end

      def make_body1(body, _docxml)
        return if @bare

        body.div **{ class: "title-section" } do |div1|
          div1.p { |p| p << "&#xa0;" } # placeholder
        end
        section_break(body)
      end

      def make_body2(body, _docxml)
        return if @bare

        body.div **{ class: "prefatory-section" } do |div2|
          div2.p { |p| p << "&#xa0;" } # placeholder
        end
        section_break(body)
      end

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

      def googlefonts
        <<~HEAD.freeze
          <link href="https://fonts.googleapis.com/css?family=Overpass:300,300i,600,900" rel="stylesheet">
          <link href="https://fonts.googleapis.com/css?family=Lato:400,400i,700,900" rel="stylesheet">
        HEAD
      end

      def html_head
        <<~HEAD.freeze
          <title>#{@meta&.get&.dig(: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>
          <script type="text/javascript">#{toclevel}</script>

          <!--Google fonts-->
          <link rel="preconnect" href="https://fonts.gstatic.com">#{' '}
          #{googlefonts}
          <!--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 html_button
        return "" if @bare

        '<button onclick="topFunction()" id="myBtn" '\
        'title="Go to top">Top</button>'.freeze
      end

      def html_main(docxml)
        docxml.at("//head").add_child(html_head)
        d = docxml.at('//div[@class="main-section"]')
        d.name = "main"
        d.children.empty? or d.children.first.previous = html_button
      end

      def sourcecodelang(lang)
        return unless lang

        case lang.downcase
        when "javascript" then "lang-js"
        when "c" then "lang-c"
        when "c+" then "lang-cpp"
        when "console" then "lang-bsh"
        when "ruby" then "lang-rb"
        when "html" then "lang-html"
        when "java" then "lang-java"
        when "xml" then "lang-xml"
        when "perl" then "lang-perl"
        when "python" then "lang-py"
        when "xsl" then "lang-xsl"
        else
          ""
        end
      end

      def sourcecode_parse(node, out)
        name = node.at(ns("./name"))
        class1 = "prettyprint #{sourcecodelang(node&.at(ns('./@lang'))&.value)}"
        out.pre **sourcecode_attrs(node).merge(class: class1) do |div|
          @sourcecode = true
          node.children.each { |n| parse(n, div) unless n.name == "name" }
          @sourcecode = false
        end
        sourcecode_name_parse(node, out, name)
      end

      def underline_parse(node, out)
        out.span **{ style: "text-decoration: underline;" } do |e|
          node.children.each { |n| parse(n, e) }
        end
      end

      def table_long_strings_cleanup(docxml); end

      def table_attrs(node)
        ret = super
        node.at(ns("./colgroup")) and ret[:style] += "table-layout:fixed;"
        ret
      end

      def image_parse(node, out, caption)
        if svg = node.at("./m:svg", "m" => "http://www.w3.org/2000/svg")
          svg_parse(svg, out)
          return
        end
        super
      end
    end
  end
end