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<?php
namespace CirrusSearch;
use LuceneExplain\ExplainFactory;
/**
 * Formats the result of elasticsearch explain to a (slightly) more
 * readable html format than raw json.
 *
 * 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 ExplainPrinter {
    /** @var string */
    private $type;
    /** @var ExplainFactory */
    private $explainFactory;
    /**
     * @param string $type Type of explain to print
     */
    public function __construct( $type ) {
        $this->type = $type;
        $this->explainFactory = new ExplainFactory;
    }
    /**
     * @param array[] $queryResult Elasticsearch result
     * @return string
     */
    public function format( array $queryResult ) {
        $result = [];
        if ( isset( $queryResult['result']['hits']['hits'] ) ) {
            $queryResult = [ $queryResult ];
        }
        foreach ( $queryResult as $qr ) {
            $result[] = "<div><h2>{$qr['description']} on {$qr['path']}</h2></div>";
            foreach ( $qr['result']['hits']['hits'] as $hit ) {
                $explain = $this->processExplain( $hit['_explanation'] );
                $result[] =
                    "<div>" .
                        "<h3>" . htmlentities( $hit['_source']['title'] ) . "</h3>" .
                        ( isset( $hit['highlight']['text'][0] ) ? "<div>" . $hit['highlight']['text'][0] . "</div>" : "" ) .
                        "<table>" .
                            "<tr>" .
                                "<td>article id</td>" .
                                "<td>" . htmlentities( $hit['_id'] ) . "</td>" .
                            "</tr><tr>" .
                                "<td>ES score</td>" .
                                "<td>" . htmlentities( $hit['_score'] ) . "</td>" .
                            "</tr><tr>" .
                                "<td>ES explain</td>" .
                                "<td><pre>" . htmlentities( $explain ) . "</pre></td>" .
                            "</tr>" .
                        "</table>" .
                    "</div>";
            }
        }
        return "<div>" . implode( '', $result ) . "</div>";
    }
    private function formatText( array $explanation, $indent = "" ) {
        $line = $indent . $explanation['value'] . ' | ' . $explanation['description'] . "\n";
        if ( isset( $explanation['details'] ) ) {
            foreach ( $explanation['details'] as $subExplanation ) {
                $line .= $this->formatText( $subExplanation, "$indent    " );
            }
        }
        return $line;
    }
    /**
     * Only visible for test purposes
     *
     * @param array $explanation
     * @return string
     */
    protected function processExplain( array $explanation ) {
        if ( $this->type === 'verbose' ) {
            return $this->formatText( $explanation );
        }
        $explain = $this->explainFactory->createExplain( $explanation );
        if ( $this->type === 'hot' ) {
            return (string)$explain->vectorize();
        } else {
            return (string)$explain;
        }
    }
}