<?php
/**
 * @license GPL-2.0-or-later
 * @file
 */

namespace MediaWiki\Specials;

use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Languages\LanguageConverterFactory;
use MediaWiki\Skin\Skin;
use MediaWiki\Title\NamespaceInfo;
use MediaWiki\Title\Title;
use stdClass;
use Wikimedia\Rdbms\IConnectionProvider;

/**
 * List of uncategorized category pages.
 *
 * @ingroup SpecialPage
 */
class SpecialUncategorizedCategories extends SpecialUncategorizedPages {
	/**
	 * Holds a list of categories, which shouldn't be listed on this special page,
	 * even if it is uncategorized.
	 * @var array
	 */
	private $exceptionList = null;

	public function __construct(
		NamespaceInfo $namespaceInfo,
		IConnectionProvider $dbProvider,
		LinkBatchFactory $linkBatchFactory,
		LanguageConverterFactory $languageConverterFactory
	) {
		parent::__construct(
			$namespaceInfo,
			$dbProvider,
			$linkBatchFactory,
			$languageConverterFactory
		);
		$this->mName = 'Uncategorizedcategories';
		$this->requestedNamespace = NS_CATEGORY;
	}

	/**
	 * Returns an array of category titles (usually without the namespace), which
	 * shouldn't be listed on this page, even if they're uncategorized.
	 *
	 * @return array
	 */
	private function getExceptionList() {
		if ( $this->exceptionList === null ) {
			$this->exceptionList = [];
			$exList = $this->msg( 'uncategorized-categories-exceptionlist' )
				->inContentLanguage()->plain();
			$proposedTitles = explode( "\n", $exList );
			foreach ( $proposedTitles as $titleStr ) {
				if ( !str_starts_with( $titleStr, '*' ) ) {
					continue;
				}
				$titleStr = preg_replace( "/^\\*\\s*/", '', $titleStr );
				$title = Title::newFromText( $titleStr, NS_CATEGORY );
				if ( $title && $title->getNamespace() !== NS_CATEGORY ) {
					$title = Title::makeTitleSafe( NS_CATEGORY, $titleStr );
				}
				if ( $title ) {
					$this->exceptionList[] = $title->getDBkey();
				}
			}
		}
		return $this->exceptionList;
	}

	/** @inheritDoc */
	public function getQueryInfo() {
		$query = parent::getQueryInfo();
		$exceptionList = $this->getExceptionList();
		if ( $exceptionList ) {
			$dbr = $this->getDatabaseProvider()->getReplicaDatabase();
			$query['conds'][] = $dbr->expr( 'page_title', '!=', $exceptionList );
		}

		return $query;
	}

	/**
	 * Formats the result
	 * @param Skin $skin The current skin
	 * @param stdClass $result The query result
	 * @return string The category link
	 */
	public function formatResult( $skin, $result ) {
		$title = Title::makeTitle( NS_CATEGORY, $result->title );
		$text = $title->getText();

		return $this->getLinkRenderer()->makeKnownLink( $title, $text );
	}
}

/**
 * Retain the old class name for backwards compatibility.
 * @deprecated since 1.41
 */
class_alias( SpecialUncategorizedCategories::class, 'SpecialUncategorizedCategories' );
