# Extending <tt>ActionView::Base</tt> to support rendering themes
#
module ActionView
   
   # Extending <tt>ActionView::Base</tt> to support rendering themes
   class Base
      alias_method :__render_file, :render_file

      # Overrides the default <tt>Base#render_file</tt> to allow theme-specific views
      def render_file(template_path, use_full_path = true, local_assigns = {})
         search_path = [
            "../themes/#{controller.current_theme}/views",       # for components
            "../../themes/#{controller.current_theme}/views",    # for normal views
            "../../themes/#{controller.current_theme}",          # for layouts
            "../../../themes/#{controller.current_theme}/views", # for mailer views
            ".",                                                 # fallback
            ".."                                                 # Mailer fallback
         ]
         
         if use_full_path
            search_path.each do |prefix|
               theme_path = prefix +'/'+ template_path
               begin
                  template_extension = pick_template_extension(theme_path)

                  # Prevent .rhtml (or any other template type) if force_liquid == true
                  if force_liquid? and
                     template_extension.to_s != 'liquid' and 
                     prefix != '.'
                     raise ThemeError.new("Template '#{template_path}' must be a liquid document")
                  end
                  
                  local_assigns['active_theme'] = get_current_theme(local_assigns)
               rescue ActionView::ActionViewError => err
                  next
               rescue ThemeError => err
                  # Should it raise an exception, or just call 'next' and revert to
                  # the default template?
                  raise err
               end
               return __render_file(theme_path, use_full_path, local_assigns)
            end
            raise ActionViewError, "No rhtml, rxml, or delegate template found for #{template_path}"
         else
            __render_file(template_path, use_full_path, local_assigns)
         end
      end
      
   private
   
    def force_liquid?
      unless controller.nil?
        if controller.respond_to?('force_liquid_template')
          controller.force_liquid_template
        end
      else
        false
      end
    end

    def get_current_theme(local_assigns)
      unless controller.nil?
        if controller.respond_to?('current_theme')
          return controller.current_theme || false
        end
      end
      # Used with ActionMailers
      if local_assigns.include? :current_theme 
        return local_assigns.delete :current_theme
      end
    end
  end
end