class Widget::GroupBys < Widget::Base

  def render_options(group_by_ary)
    group_by_ary.sort_by do |group_by|
      group_by.label
    end.collect do |group_by|
      next unless group_by.selectable?
      content_tag :option, :value => group_by.underscore_name, :'data-label' => "#{CGI::escapeHTML(h(group_by.label))}" do
        h(group_by.label)
      end
    end.join.html_safe
  end

  def render_group_caption(type)
    content_tag :span do
      out = content_tag :span, l("label_#{type}".to_sym), :class => 'in_row group_by_caption'
      out += content_tag :span, :class => 'arrow in_row arrow_group_by_caption' do
        '' #cannot use tag here as it would generate <span ... /> which leads to wrong interpretation in most browsers
      end
      out.html_safe
    end
  end

  def render_group(type, initially_selected, show_help = false)
    initially_selected = initially_selected.map do |group_by|
      [group_by.class.underscore_name, h(group_by.class.label)]
    end

    content_tag :fieldset,
                :id => "group_by_#{type}",
                :class => 'drag_target drag_container',
                :'data-initially-selected' => initially_selected.to_json.gsub('"', "'") do

      out = content_tag :legend, l(:"label_#{type}"), :class => "hidden-for-sighted"

      out += render_group_caption type

      out += label_tag  "add_group_by_#{type}",
                        l(:"label_group_by_add"),
                        :class => 'hidden-for-sighted'

      out += content_tag :select, :id => "add_group_by_#{type}", :class => 'select-small' do
        content = content_tag :option, "-- #{l(:label_group_by_add)} --", :value => ''

        content += engine::GroupBy.all_grouped.sort_by do |label, group_by_ary|
          l(label)
        end.collect do |label, group_by_ary|
          content_tag :optgroup, :label => h(l(label)) do
            render_options group_by_ary
          end
        end.join.html_safe
        content
      end

      if show_help
        out += maybe_with_help :icon => { :class => 'group-by-icon' },
                               :tooltip => { :class => 'group-by-tip' },
                               :instant_write => false
      end

      out
    end
  end

  def render
    write(content_tag(:div, :id => 'group_by_area') do
      out =  render_group 'columns', @subject.group_bys(:column), true
      out += render_group 'rows', @subject.group_bys(:row)
      out += image_tag "reporting_engine/remove.gif",
                       :id => "hidden_remove_img",
                       :style => "display:none",
                       :class => "reporting_hidden_group_remove_image"
      out.html_safe
    end)
  end
end