module Ksk::FrontendHelper

  def recursive_navi(navis, current_level = 0, max_level = 99)
    a = ' <ul>'
    navis.each do |navi|
      active = navi.slug == @slugs[current_level] ? ' class="active"' : nil
      next unless nt = navi.navigation_type
      link = if nt.name == 'news'
        link_to navi.title, posts_path
      else
        link_to navi.title, navi.link
      end
      a += " <li#{active}>#{link}"
      if active && current_level <= max_level && navi.children.not_hidden.any?
        a += recursive_navi(navi.children.not_hidden, current_level+1, max_level)
      end
      a += '</li> '
    end
    a += '</ul> '
  end

  def kskmd(model_instance)
    mdap(model_instance.content_long, model_instance.assets.only_images, model_instance.assets.only_data_files)
  end

  def md(text)
    return '' if text.blank?
    markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML.new(), fenced_code_blocks: true, autolink: true)
    markdown.render(text).html_safe
  end

  def mdap(text, images, data_files)
    return '' if text.blank?
    t = place_images(text, images)
    t = place_data_files(t, data_files)
    md(t)
  end

  def place_content(text, files, type, &html)
    t = text
    Ksk::Markdown.parse_text(text, type).each do |match|
      relpace = if asset = files[match[1].to_i-1]
        html.call(asset, match[2])
      end
      t = t.gsub(match[0], relpace.to_s)
    end
    t.html_safe
  end

  def place_images(text, images)
    place_content(text, images, 'img') do |asset, option|
      c = option || 'thumb'
      image_tag asset.file.url(c), class: ['uploaded_image', c]
    end
  end

  def place_data_files(text, data_files)
    place_content(text, data_files, 'file') do |asset, option|
      link_to asset.file.url, title: asset.file.original_filename, class: asset.has_preview? ? :uploaded_file_preview : :uploaded_file do
        if asset.has_preview?
          if asset.has_preview_image?
            t_capition = !asset.preview.name.blank? ? asset.preview.name : t('ksk.asset.file_preview.button.download')
            image_tag( asset.preview_file.url(:banner) )+
            "<span>#{t_capition}</span>".html_safe
          else
            asset.preview.name
          end
        else
          asset.file_file_name
        end
      end
    end
  end

end