module RailsAdmin
  module Config
    module Actions
      class NestedSet < Base
        RailsAdmin::Config::Actions.register(self)

        # Is the action acting on the root level (Example: /admin/contact)
        register_instance_option :root? do
          false
        end

        register_instance_option :collection? do
          true
        end

        # Is the action on an object scope (Example: /admin/team/1/edit)
        register_instance_option :member? do
          false
        end

        register_instance_option :pjax? do
          false
        end

        register_instance_option :controller do
          Proc.new do |klass|
            @nested_set_conf = ::RailsAdminNestedSet::Configuration.new @abstract_model
            if params['id'].present?
              begin
                id        = params[:id].to_s
                parent_id = params[:parent_id].to_s
                prev_id   = params[:prev_id].to_s
                next_id   = params[:next_id].to_s

                if id.empty?
                  return render plain: 'Nested set UI error: node id not defined', status: 500
                elsif parent_id.empty? && prev_id.empty? && next_id.empty?
                  return render plain: 'Nested set UI error: not defined where to move node', status: 500
                end


                obj = @abstract_model.model.find(id)
                if prev_id.empty? && next_id.empty?
                  obj.move_to_child_of @abstract_model.model.find(parent_id)
                elsif !prev_id.empty?
                  obj.move_to_right_of @abstract_model.model.find(prev_id)
                elsif !next_id.empty?
                  obj.move_to_left_of @abstract_model.model.find(next_id)
                end

                message = "<strong>#{I18n.t('admin.actions.nested_set.success')}!</strong>"
                render plain: message
              rescue Exception => e
                @abstract_model.model.rebuild!
                Rails.logger.error("#{e.class.name}: #{e.message}:\n#{e.backtrace.join("\n")}")
                render plain: "<strong>#{I18n.t('admin.actions.nested_set.error')}</strong>: #{e}", status: 500
              end

            else
              @nodes = list_entries(@model_config, :index, nil, nil)

              unless @model_config.list.scopes.empty?
                if params[:scope].blank?
                  unless @model_config.nested_set[:scopes].first.nil?
                    @nodes = @nodes.send(@model_config.nested_set[:scopes].first)
                  end
                elsif @model_config.nested_set[:scopes].collect(&:to_s).include?(params[:scope])
                  @nodes = @nodes.send(params[:scope].to_sym)
                end
              end

              @nodes = @nodes.sort { |a,b| a.lft <=> b.lft }

              render action: @action.template_name
            end
          end
        end

        register_instance_option :link_icon do
          'icon-move'
        end

        register_instance_option :http_methods do
          [:get, :post]
        end
      end
    end
  end
end