<?php
/**
 * Implements Special:Unwatchedpages
 *
 * Copyright © 2005 Ævar Arnfjörð Bjarmason
 *
 * 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
 * @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
 */

/**
 * A special page that displays a list of pages that are not on anyones watchlist.
 *
 * @ingroup SpecialPage
 */
class UnwatchedpagesPage extends QueryPage {

	function __construct( $name = 'Unwatchedpages' ) {
		parent::__construct( $name, 'unwatchedpages' );
	}

	function isExpensive() {
		return true;
	}

	function isSyndicated() {
		return false;
	}

	function getQueryInfo() {
		return array (
			'tables' => array ( 'page', 'watchlist' ),
			'fields' => array ( 'namespace' => 'page_namespace',
					'title' => 'page_title',
					'value' => 'page_namespace' ),
			'conds' => array ( 'wl_title IS NULL',
					'page_is_redirect' => 0,
					"page_namespace != '" . NS_MEDIAWIKI .
					"'" ),
			'join_conds' => array ( 'watchlist' => array (
				'LEFT JOIN', array ( 'wl_title = page_title',
					'wl_namespace = page_namespace' ) ) )
		);
	}

	function sortDescending() {
		return false;
	}

	function getOrderFields() {
		return array( 'page_namespace', 'page_title' );
	}

	/**
	 * @param $skin Skin
	 * @param $result
	 * @return string
	 */
	function formatResult( $skin, $result ) {
		global $wgContLang;

		$nt = Title::makeTitleSafe( $result->namespace, $result->title );
		if ( !$nt ) {
			return Html::element( 'span', array( 'class' => 'mw-invalidtitle' ),
				Linker::getInvalidTitleDescription( $this->getContext(), $result->namespace, $result->title ) );
		}

		$text = $wgContLang->convert( $nt->getPrefixedText() );

		$plink = Linker::linkKnown( $nt, htmlspecialchars( $text ) );
		$token = WatchAction::getWatchToken( $nt, $this->getUser() );
		$wlink = Linker::linkKnown(
			$nt,
			$this->msg( 'watch' )->escaped(),
			array(),
			array( 'action' => 'watch', 'token' => $token )
		);

		return $this->getLanguage()->specialList( $plink, $wlink );
	}

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