<?php
/**
 * 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 Pager
 */

/**
 * @ingroup Pager
 */
class CategoryPager extends AlphabeticPager {

	/**
	 * @var PageLinkRenderer
	 */
	protected $linkRenderer;

	/**
	 * @param IContextSource $context
	 * @param string $from
	 * @param PageLinkRenderer $linkRenderer
	 */
	public function __construct( IContextSource $context, $from, PageLinkRenderer $linkRenderer
	) {
		parent::__construct( $context );
		$from = str_replace( ' ', '_', $from );
		if ( $from !== '' ) {
			$from = Title::capitalize( $from, NS_CATEGORY );
			$this->setOffset( $from );
			$this->setIncludeOffset( true );
		}

		$this->linkRenderer = $linkRenderer;
	}

	function getQueryInfo() {
		return [
			'tables' => [ 'category' ],
			'fields' => [ 'cat_title', 'cat_pages' ],
			'conds' => [ 'cat_pages > 0' ],
			'options' => [ 'USE INDEX' => 'cat_title' ],
		];
	}

	function getIndexField() {
		return 'cat_title';
	}

	function getDefaultQuery() {
		parent::getDefaultQuery();
		unset( $this->mDefaultQuery['from'] );

		return $this->mDefaultQuery;
	}

	/* Override getBody to apply LinksBatch on resultset before actually outputting anything. */
	public function getBody() {
		$batch = new LinkBatch;

		$this->mResult->rewind();

		foreach ( $this->mResult as $row ) {
			$batch->addObj( Title::makeTitleSafe( NS_CATEGORY, $row->cat_title ) );
		}
		$batch->execute();
		$this->mResult->rewind();

		return parent::getBody();
	}

	function formatRow( $result ) {
		$title = new TitleValue( NS_CATEGORY, $result->cat_title );
		$text = $title->getText();
		$link = $this->linkRenderer->renderHtmlLink( $title, $text );

		$count = $this->msg( 'nmembers' )->numParams( $result->cat_pages )->escaped();
		return Html::rawElement( 'li', null, $this->getLanguage()->specialList( $link, $count ) ) . "\n";
	}

	public function getStartForm( $from ) {
		return Xml::tags(
			'form',
			[ 'method' => 'get', 'action' => wfScript() ],
			Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) .
			Xml::fieldset(
				$this->msg( 'categories' )->text(),
				Xml::inputLabel(
					$this->msg( 'categoriesfrom' )->text(),
					'from', 'from', 20, $from, [ 'class' => 'mw-ui-input-inline' ] ) .
				' ' .
				Html::submitButton(
					$this->msg( 'categories-submit' )->text(),
					[], [ 'mw-ui-progressive' ]
				)
			)
		);
	}
}