<?php
/**
 * Rebuild the fulltext search indexes. This may take a while
 * depending on the database size and server configuration.
 *
 * Rebuilding is faster if you drop the index and recreate it,
 * but that will prevent searches from working while it runs.
 *
 * @todo document
 * @package MediaWiki
 * @subpackage Maintenance
 */

/** */
define( "RTI_CHUNK_SIZE", 500 );

function dropTextIndex( &$database )
{
	$searchindex = $database->tableName( 'searchindex' );
	if ( $database->indexExists( "searchindex", "si_title" ) ) {
		echo "Dropping index...\n";
		$sql = "ALTER TABLE $searchindex DROP INDEX si_title, DROP INDEX si_text";
		$database->query($sql, "dropTextIndex" );
	}
}

function createTextIndex( &$database )
{
	$searchindex = $database->tableName( 'searchindex' );
	echo "Rebuild the index...\n";
	$sql = "ALTER TABLE $searchindex ADD FULLTEXT si_title (si_title), " .
	  "ADD FULLTEXT si_text (si_text)";
	$database->query($sql, "createTextIndex" );
}

function rebuildTextIndex( &$database )
{
	extract( $database->tableNames( 'cur', 'searchindex' ) );

	$sql = "SELECT MAX(cur_id) AS count FROM $cur";
	$res = $database->query($sql, "rebuildTextIndex" );
	$s = $database->fetchObject($res);
	$count = $s->count;
	echo "Rebuilding index fields for {$count} pages...\n";
	$n = 0;

	while ( $n < $count ) {
		print "$n\n";
		$end = $n + RTI_CHUNK_SIZE - 1;
		$sql = "SELECT cur_id, cur_namespace, cur_title, cur_text FROM $cur WHERE cur_id BETWEEN $n AND $end";
		$res = $database->query($sql, "rebuildTextIndex" );

		while( $s = $database->fetchObject($res) ) {
			$u = new SearchUpdate( $s->cur_id, $s->cur_title, $s->cur_text );
			$u->doUpdate();
		}
		$database->freeResult( $res );
		$n += RTI_CHUNK_SIZE;
	}
}

?>