fiedl/your_platform

require 'nokogiri'

module BoxHelper

  def box(options = {}, &block)
    @box_counter = (@box_counter || 0) + 1
    options[:classes] ||= []
    options[:classes] += [options[:class]] if options[:class]
    options[:classes] += ['first'] if @box_counter == 1
    render layout: 'layouts/new_box', locals: options, &block
  end

  def content_box( options = {} )
    heading = options[ :heading ]
    content = options[ :content ]
    content = yield unless content
    box_class = options[:box_class]
    box_id = options[:box_id]

    box id: box_id, class: box_class do
      content_for(:box_title) { heading }
      content_for(:box_content) { content }
      content
    end
  end

  def convert_to_content_box( html_code = nil )
    Rack::MiniProfiler.step("convert_to_content_box") do
      html_code = yield unless html_code
      html_convert_h1_to_boxes( html_code )
    end
  end

  def html_convert_h1_to_boxes( html_code, options = {} )

    # Further Nokogiri Reference
    # * http://stackoverflow.com/questions/3449767/
    # * http://www.engineyard.com/blog/2010/getting-started-with-nokogiri/
    # * http://nokogiri.org/Nokogiri/XML/Node.html#method-i-next_element
    # * http://stackoverflow.com/questions/4723344/how-to-prevent-nokogiri-from-adding-doctype-tags
    # * http://stackoverflow.com/questions/3817843/using-xpath-with-html-or-xml-fragment
    #
    doc = Nokogiri::HTML::DocumentFragment.parse( html_code )

    box_counter = 0
    doc.xpath( 'descendant::h1' ).each do |h1_node|
      unless h1_node.ancestors('.box').any?
        box_counter += 1
        heading = h1_node.inner_html.html_safe
        heading_class = h1_node.attr( :class )
        heading_class ||= ""
        heading_class += " first" if box_counter == 1
        heading_id = h1_node.attr(:id)

        content_element = h1_node.next_element
        if content_element
          content = content_element.to_html.html_safe
          content_element.remove()
        end
        content ||= "" # because content_box expects a String

        h1_node.replace content_box(heading: heading, content: content, box_class: heading_class, box_id: heading_id)
      end
    end

    return doc.to_s.html_safe
  end

end