module Transit
  module PaginationHelper
  unloadable
  
    def paginate(collection, html_attrs = {})    
      return "" if collection.total_count <= 0
    
      total_pages  = collection.total_pages
      current_page = collection.current_page
      html_classes = (html_attrs.delete(:class) || "").split(" ")
      window_min   = [(current_page - 5), 1].max
      window_max   = [(current_page + 5), total_pages].min
      page_links   = []
    
      html_attrs.merge!('class' => html_classes.push('pagination_link').uniq.join(" "))
    
      (window_min..window_max).to_a.each do |page|
        unless page == current_page        
          page_links << pagination_link(page, html_attrs)
        else
          page_links << content_tag(:span, page, class: 'current').to_s
        end
      end
    
      unless current_page == 1
        page_links.unshift pagination_link_previous(current_page - 1, html_attrs).html_safe
      end
      unless current_page == total_pages
        page_links << pagination_link_next(current_page + 1, total_pages, html_attrs).html_safe
      end
    
      content_tag(:p, class: 'pagination') do
        content_tag(:span, "Viewing page #{current_page} of #{total_pages}", class: 'pagination_detail') <<
        content_tag(:span, page_links.join(" ").html_safe, class: 'pagination_links')
      end.html_safe

    end
  
    private 
  
    def pagination_link_previous(prev_page, attrs)
      pagination_link(1, attrs, "&lArr;") <<
      pagination_link(prev_page, attrs, "&laquo;")
    end
  
    def pagination_link_next(next_page, last_page, attrs)
      pagination_link(next_page, attrs, "&raquo;") <<
      pagination_link(last_page, attrs, "&rArr;")
    end
  
    def pagination_link(page, attrs, text = nil)
      text ||= page
      qstring  = CGI.parse(request.query_string).merge('page' => page )
      link_to(text.to_s.html_safe, "?#{qstring.to_query}", attrs).html_safe.to_s
    end
    
  end
end