<?php
/**
 * Quick demo hack to generate a plaintext link dump,
 * per the proposed wiki link database standard:
 * http://www.usemod.com/cgi-bin/mb.pl?LinkDatabase
 *
 * Includes all (live and broken) intra-wiki links.
 * Does not include interwiki or URL links.
 * Dumps ASCII text to stdout; command-line.
 *
 * Copyright © 2005 Brooke Vibber <bvibber@wikimedia.org>
 * https://www.mediawiki.org/
 *
 * @license GPL-2.0-or-later
 * @file
 * @ingroup Maintenance
 */

// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd

use MediaWiki\Deferred\LinksUpdate\PageLinksTable;
use MediaWiki\Maintenance\Maintenance;
use MediaWiki\Title\Title;

/**
 * Maintenance script that generates a plaintext link dump.
 *
 * @ingroup Maintenance
 */
class DumpLinks extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->addDescription( 'Quick demo hack to generate a plaintext link dump' );
	}

	public function execute() {
		$dbr = $this->getServiceContainer()
			->getConnectionProvider()
			->getReplicaDatabase( PageLinksTable::VIRTUAL_DOMAIN );
		$linksMigration = $this->getServiceContainer()->getLinksMigration();
		$queryInfo = $linksMigration->getQueryInfo( 'pagelinks' );
		$queryInfo['tables'] = array_diff( $queryInfo['tables'], [ 'pagelinks' ] );
		[ $blNamespace, $blTitle ] = $linksMigration->getTitleFields( 'pagelinks' );

		$result = $dbr->newSelectQueryBuilder()
			->select( array_merge( [
				'page_id',
				'page_namespace',
				'page_title',
			], $queryInfo['fields'] ) )
			->from( 'page' )
			->join( 'pagelinks', null, [ 'page_id=pl_from' ] )
			->joinConds( $queryInfo['joins'] )
			->tables( $queryInfo['tables'] )
			->orderBy( 'page_id' )
			->caller( __METHOD__ )
			->fetchResultSet();

		$lastPage = null;
		foreach ( $result as $row ) {
			if ( $lastPage != $row->page_id ) {
				if ( $lastPage !== null ) {
					$this->output( "\n" );
				}
				$page = Title::makeTitle( $row->page_namespace, $row->page_title );
				$this->output( $page->getPrefixedURL() );
				$lastPage = $row->page_id;
			}
			$link = Title::makeTitle( $row->$blNamespace, $row->$blTitle );
			$this->output( " " . $link->getPrefixedURL() );
		}
		if ( $lastPage !== null ) {
			$this->output( "\n" );
		}
	}
}

// @codeCoverageIgnoreStart
$maintClass = DumpLinks::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd
