wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Repo\Hooks\Helpers;

use MediaWiki\User\User;
use Wikibase\Lib\ContentLanguages;
use Wikibase\Lib\UserLanguageLookup;

/**
 * @license GPL-2.0-or-later
 */
class UserPreferredContentLanguagesLookup {

    /**
     * @var ContentLanguages
     */
    private $contentLanguages;

    /**
     * @var UserLanguageLookup
     */
    private $userLanguageLookup;

    /**
     * @var string
     */
    private $wikiDefaultContentLanguage;

    public function __construct(
        ContentLanguages $contentLanguages,
        UserLanguageLookup $userLanguageLookup,
        $wikiDefaultContentLanguage
    ) {
        $this->userLanguageLookup = $userLanguageLookup;
        $this->contentLanguages = $contentLanguages;
        $this->wikiDefaultContentLanguage = $wikiDefaultContentLanguage;
    }

    /**
     * @param string $uiLanguage User interface language; will be returned as the first language in the list if valid
     * @param User $user
     *
     * @return array language codes
     */
    public function getLanguages( $uiLanguage, User $user ) {
        $validLanguages = array_filter(
            array_unique( array_merge(
                [ $uiLanguage ],
                $this->userLanguageLookup->getAllUserLanguages( $user )
            ) ),
            [ $this->contentLanguages, 'hasLanguage' ]
        );
        return count( $validLanguages ) === 0 ?
            [ $this->wikiDefaultContentLanguage ] :
            array_values( $validLanguages );
    }

}