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<?php
namespace CirrusSearch\Maintenance;
use CirrusSearch\SearchConfig;
use MediaWiki\MediaWikiServices;
/**
 * Builds elasticsearch mapping configuration arrays for the suggester index.
 *
 * 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 SuggesterMappingConfigBuilder {
    /**
     * Version number for the core analysis. Increment the major
     * version when the analysis changes in an incompatible way,
     * and change the minor version when it changes but isn't
     * incompatible
     */
    public const VERSION = '3.0';
    /** @var SearchConfig */
    private $config;
    /**
     * @param SearchConfig|null $config
     */
    public function __construct( SearchConfig $config = null ) {
        if ( $config === null ) {
            $config =
                MediaWikiServices::getInstance()->getConfigFactory()->makeConfig( 'CirrusSearch' );
        }
        $this->config = $config;
    }
    /**
     * @return array
     */
    public function buildConfig() {
        $suggest = [
            'dynamic' => false,
            '_source' => [ 'enabled' => true ],
            'properties' => [
                'batch_id' => [ 'type' => 'long' ],
                'source_doc_id' => [ 'type' => 'keyword' ],
                // Sadly we can't reuse the same input
                // into multiple fields, it would help
                // us to save space since we now have
                // to store the source.
                'suggest' => [
                    'type' => 'completion',
                    'analyzer' => 'plain',
                    'search_analyzer' => 'plain_search',
                    'max_input_length' => 255,
                ],
                'suggest-stop' => [
                    'type' => 'completion',
                    'analyzer' => 'stop_analyzer',
                    'search_analyzer' => 'stop_analyzer_search',
                    'preserve_separators' => false,
                    'preserve_position_increments' => false,
                    'max_input_length' => 255,
                ],
            ]
        ];
        if ( $this->config->getElement( 'CirrusSearchCompletionSuggesterSubphrases', 'build' ) ) {
            $suggest['properties']['suggest-subphrases'] = [
                'type' => 'completion',
                'analyzer' => 'subphrases',
                'search_analyzer' => 'subphrases_search',
                'max_input_length' => 255,
            ];
        }
        return $suggest;
    }
}