<?php
/**
 * Implements Special:Uncategorizedpages
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup SpecialPage
 */

/**
 * A special page looking for page without any category.
 *
 * @ingroup SpecialPage
 */
// @todo FIXME: Make $requestedNamespace selectable, unify all subclasses into one
class UncategorizedPagesPage extends PageQueryPage {
	protected $requestedNamespace = false;

	function __construct( $name = 'Uncategorizedpages' ) {
		parent::__construct( $name );
	}

	function sortDescending() {
		return false;
	}

	function isExpensive() {
		return true;
	}

	function isSyndicated() {
		return false;
	}

	function getQueryInfo() {
		return array (
			'tables' => array ( 'page', 'categorylinks' ),
			'fields' => array ( 'namespace' => 'page_namespace',
					'title' => 'page_title',
					'value' => 'page_title' ),
			// default for page_namespace is all content namespaces (if requestedNamespace is false)
			// otherwise, page_namespace is requestedNamespace
			'conds' => array ( 'cl_from IS NULL',
					'page_namespace' => ( $this->requestedNamespace !== false ? $this->requestedNamespace : MWNamespace::getContentNamespaces() ),
					'page_is_redirect' => 0 ),
			'join_conds' => array ( 'categorylinks' => array (
					'LEFT JOIN', 'cl_from = page_id' ) )
		);
	}

	function getOrderFields() {
		// For some crazy reason ordering by a constant
		// causes a filesort
		if( $this->requestedNamespace === false && count( MWNamespace::getContentNamespaces() ) > 1 )
			return array( 'page_namespace', 'page_title' );
		return array( 'page_title' );
	}

	protected function getGroupName() {
		return 'maintenance';
	}
}