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<?php
namespace CirrusSearch;
use Language;
use MediaWiki\Logger\LoggerFactory;
use Title;
/**
 * Picks the best "near match" title.
 *
 * 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
 */
class NearMatchPicker {
    /**
     * @var Language language to use during normalization process
     */
    private $language;
    /**
     * @var string the search term
     */
    private $term;
    /**
     * @var array[] Potential near matches
     */
    private $titles;
    /**
     * @param Language $language to use during normalization process
     * @param string $term the search term
     * @param array[] $titles Array of arrays, each with optional keys:
     *   titleMatch => a title if the title matched
     *   redirectMatches => an array of redirect matches, one per matched redirect
     */
    public function __construct( $language, $term, $titles ) {
        $this->language = $language;
        $this->term = $term;
        $this->titles = $titles;
    }
    /**
     * Pick the best near match if possible.
     *
     * @return Title|null title if there is a near match and null otherwise
     */
    public function pickBest() {
        if ( !$this->titles ) {
            return null;
        }
        if ( !$this->term ) {
            return null;
        }
        if ( count( $this->titles ) === 1 ) {
            if ( isset( $this->titles[ 0 ][ 'titleMatch' ] ) ) {
                return $this->titles[ 0 ][ 'titleMatch' ];
            }
            if ( isset( $this->titles[ 0 ][ 'redirectMatches' ][ 0 ] ) ) {
                return $this->titles[ 0 ][ 'redirectMatches' ][ 0 ];
            }
            LoggerFactory::getInstance( 'CirrusSearch' )->info(
                'NearMatchPicker built with busted matches.  Assuming no near match' );
            return null;
        }
        $transformers = [
            static function ( $term ) {
                return $term;
            },
            [ $this->language, 'lc' ],
            [ $this->language, 'ucwords' ],
        ];
        foreach ( $transformers as $transformer ) {
            $transformedTerm = call_user_func( $transformer, $this->term );
            $found = null;
            foreach ( $this->titles as $title ) {
                $match = $this->checkAllMatches( $transformer, $transformedTerm, $title );
                if ( $match ) {
                    // @phan-suppress-next-line PhanSuspiciousValueComparisonInLoop
                    if ( $found === null ) {
                        $found = $match;
                    } else {
                        // Found more than one result so we try another transformer
                        $found = null;
                        break;
                    }
                }
            }
            if ( $found ) {
                return $found;
            }
        }
        // Didn't find anything
        return null;
    }
    /**
     * Check a single title's worth of matches.  The big thing here is that titles cannot compete with themselves.
     * @param callable $transformer
     * @param string $transformedTerm
     * @param array $allMatchedTitles
     * @return null|Title null if no title matches and the actual title (either of the page or of a redirect to the
     *       page) if one did match
     */
    private function checkAllMatches( $transformer, $transformedTerm, $allMatchedTitles ) {
        if ( isset( $allMatchedTitles[ 'titleMatch' ] ) &&
                $this->checkOneMatch( $transformer, $transformedTerm, $allMatchedTitles[ 'titleMatch' ] ) ) {
            return $allMatchedTitles[ 'titleMatch' ];
        }
        if ( isset( $allMatchedTitles[ 'redirectMatches' ] ) ) {
            foreach ( $allMatchedTitles[ 'redirectMatches' ] as $redirectMatch ) {
                if ( $this->checkOneMatch( $transformer, $transformedTerm, $redirectMatch ) ) {
                    return $redirectMatch;
                }
            }
        }
        return null;
    }
    /**
     * @param callable $transformer
     * @param string $transformedTerm
     * @param Title $matchedTitle
     * @return bool
     */
    private function checkOneMatch( $transformer, $transformedTerm, $matchedTitle ) {
        $transformedTitle = call_user_func( $transformer, $matchedTitle->getText() );
        return $transformedTerm === $transformedTitle;
    }
}