require "fileutils"
require "base64"

module IsoDoc::HtmlFunction
  module Html
    def make_body1(body, _docxml)
      body.div **{ class: "title-section" } do |div1|
        div1.p { |p| p << "&nbsp;" } # placeholder
      end
      section_break(body)
    end

    def make_body2(body, docxml)
      body.div **{ class: "prefatory-section" } do |div2|
        div2.p { |p| p << "&nbsp;" } # placeholder
      end
      section_break(body)
    end

    def make_body3(body, docxml)
      body.div **{ class: "main-section" } do |div3|
        boilerplate docxml, div3
        abstract docxml, div3
        foreword docxml, div3
        introduction 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-->
      #{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()
      '<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 **attr_code(id: node["id"], 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
  end
end