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<?php
/**
 * Makes the required database updates for rev_parent_id
 * to be of any use. It can be used for some simple tracking
 * and to find new page edits by users.
 *
 * 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
 *
 * @file
 * @ingroup Maintenance
 */
require_once __DIR__ . '/Maintenance.php';
use MediaWiki\MediaWikiServices;
/**
 * Maintenance script that makes the required database updates for rev_parent_id
 * to be of any use.
 *
 * @ingroup Maintenance
 */
class PopulateParentId extends LoggedUpdateMaintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Populates rev_parent_id' );
    }
    protected function getUpdateKey() {
        return 'populate rev_parent_id';
    }
    protected function updateSkippedMessage() {
        return 'rev_parent_id column of revision table already populated.';
    }
    protected function doDBUpdates() {
        $batchSize = $this->getBatchSize();
        $db = $this->getDB( DB_MASTER );
        if ( !$db->tableExists( 'revision', __METHOD__ ) ) {
            $this->error( "revision table does not exist" );
            return false;
        }
        $this->output( "Populating rev_parent_id column\n" );
        $start = $db->selectField( 'revision', 'MIN(rev_id)', '', __FUNCTION__ );
        $end = $db->selectField( 'revision', 'MAX(rev_id)', '', __FUNCTION__ );
        if ( $start === null || $end === null ) {
            $this->output( "...revision table seems to be empty, nothing to do.\n" );
            return true;
        }
        # Do remaining chunk
        $blockStart = intval( $start );
        $blockEnd = intval( $start ) + $batchSize - 1;
        $count = 0;
        $changed = 0;
        $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
        while ( $blockStart <= $end ) {
            $this->output( "...doing rev_id from $blockStart to $blockEnd\n" );
            $cond = "rev_id BETWEEN $blockStart AND $blockEnd";
            $res = $db->select( 'revision',
                [ 'rev_id', 'rev_page', 'rev_timestamp', 'rev_parent_id' ],
                [ $cond, 'rev_parent_id' => null ], __METHOD__ );
            # Go through and update rev_parent_id from these rows.
            # Assume that the previous revision of the title was
            # the original previous revision of the title when the
            # edit was made...
            foreach ( $res as $row ) {
                # First, check rows with the same timestamp other than this one
                # with a smaller rev ID. The highest ID "wins". This avoids loops
                # as timestamp can only decrease and never loops with IDs (from parent to parent)
                $previousID = $db->selectField( 'revision', 'rev_id',
                    [ 'rev_page' => $row->rev_page, 'rev_timestamp' => $row->rev_timestamp,
                        "rev_id < " . intval( $row->rev_id ) ],
                    __METHOD__,
                    [ 'ORDER BY' => 'rev_id DESC' ] );
                # If there are none, check the highest ID with a lower timestamp
                if ( !$previousID ) {
                    # Get the highest older timestamp
                    $lastTimestamp = $db->selectField(
                        'revision',
                        'rev_timestamp',
                        [
                            'rev_page' => $row->rev_page,
                            "rev_timestamp < " . $db->addQuotes( $row->rev_timestamp )
                        ],
                        __METHOD__,
                        [ 'ORDER BY' => 'rev_timestamp DESC' ]
                    );
                    # If there is one, let the highest rev ID win
                    if ( $lastTimestamp ) {
                        $previousID = $db->selectField( 'revision', 'rev_id',
                            [ 'rev_page' => $row->rev_page, 'rev_timestamp' => $lastTimestamp ],
                            __METHOD__,
                            [ 'ORDER BY' => 'rev_id DESC' ] );
                    }
                }
                $previousID = intval( $previousID );
                if ( $previousID != $row->rev_parent_id ) {
                    $changed++;
                }
                # Update the row...
                $db->update( 'revision',
                    [ 'rev_parent_id' => $previousID ],
                    [ 'rev_id' => $row->rev_id ],
                    __METHOD__ );
                $count++;
            }
            $blockStart += $batchSize;
            $blockEnd += $batchSize;
            $lbFactory->waitForReplication();
        }
        $this->output( "rev_parent_id population complete ... {$count} rows [{$changed} changed]\n" );
        return true;
    }
}
$maintClass = PopulateParentId::class;
require_once RUN_MAINTENANCE_IF_MAIN;