# vim: set ts=2 sw=2 et ai ft=ruby:
module Fosdem

  def navigation(list, opts={})
    show_active = opts.fetch(:active, true)
    accesskeys = opts.fetch(:accesskeys, false)

    list.map do |link|
      target_id = case link
                  when Hash
                    link.values.first
                  else
                    link.to_s
                  end

      if target_id =~ %r{^(http|https|ftp|ftps|mailto):}
        title = case link
                when Hash
                  link.keys.first.to_s
                else
                  link.to_s
                end
        %Q!<li><a href="#{target_id}">#{title}</a></li>!
      else
        target_id = target_id + '/' unless target_id.end_with? '/'
        target = $item_by_id.fetch(target_id)

        fail "target #{target.identifier} (#{target[:filename]}) has no path" unless target.path
        fail "target #{target.identifier} (#{target[:filename]}) is internal" if target[:kind] == 'internal'
        fail "target #{target.identifier} (#{target[:filename]}) is hidden" if target[:hidden] == true

        title =
          case link
          when Hash
            link.keys.first.to_s
          else
            if target[:navtitle]
              target[:navtitle]
            else
              target[:title]
            end
          end
        css = []
        if show_active
          active = if target_id == '/'
                     @item.path == target.path
                   else
                     @item.path.start_with? target.path
                 end
          css << :active if active
        end
        css << :home if target.identifier == '/'

        cssattr = if css.empty?
                    ""
                  else
                    %Q! class="#{css.map(&:to_s).join(' ')}"!
                  end

        ak = if accesskeys
               case target.identifier
               when '/'
                 "1"
               when '/news/'
                 "2"
               when '/search/'
                 "4"
               when "/faq/"
                 "5"
               when "/schedule/"
                 "s"
               else
                 nil
               end
             else
               nil
             end

        ak = %Q! accesskey="#{ak}"! if ak

        title = henc title

        %Q!<li#{cssattr}><a#{ak} href="#{target.path}">#{title}</a></li>!
      end
    end.join("\n")
  end

end

