<?php
/**
 * 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.
 *
 * @file
 * @ingroup Extensions
 * @version 3.0
 * @author Stephanie Amanda Stevens <phroziac@gmail.com>
 * @author Robin Pepermans (SPQRobin) <robinp.1273@gmail.com>
 * @author Jack Phoenix <jack@shoutwiki.com>
 * @author Calimonius the Estrange <isarra@shoutwiki.com>
 * @copyright Copyright © 2005-2007 Stephanie Amanda Stevens
 * @copyright Copyright © 2007-2011 Robin Pepermans (SPQRobin)
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License 2.0 or later
 * @link http://www.mediawiki.org/wiki/Extension:SpecialInterwiki Documentation
 * Formatting improvements Stephen Kennedy, 2006.
 */

if ( !defined( 'MEDIAWIKI' ) ) {
	die( "This is not a valid entry point.\n" );
}

// Set this value to true in LocalSettings.php if you will not use this
// extension to actually change any interwiki table entries. It will suppress
// the addition of a log for interwiki link changes.
$wgInterwikiViewOnly = false;

// Name of a database where global interwikis will be stored.
$wgInterwikiCentralDB = null;

// Extension credits for Special:Version
$wgExtensionCredits['specialpage'][] = array(
	'path' => __FILE__,
	'name' => 'Interwiki',
	'author' => array(
		'Stephanie Amanda Stevens',
		'Alexandre Emsenhuber',
		'Robin Pepermans',
		'Siebrand Mazeland',
		'Platonides',
		'Raimond Spekking',
		'Sam Reed',
		'Jack Phoenix',
		'Calimonius the Estrange',
		'...'
	),
	'version' => '3.0 20140719',
	'url' => 'https://www.mediawiki.org/wiki/Extension:Interwiki',
	'descriptionmsg' => 'interwiki-desc',
);

$wgExtensionFunctions[] = 'setupInterwikiExtension';

$wgResourceModules['ext.interwiki.specialpage'] = array(
	'styles' => 'Interwiki.css',
	'localBasePath' => dirname( __FILE__ ),
	'remoteExtPath' => 'Interwiki',
	'dependencies' => array(
		'jquery.makeCollapsible',
	),
);

// Set up the new special page
$dir = dirname( __FILE__ ) . '/';
$wgMessagesDirs['Interwiki'] = __DIR__ . '/i18n';
$wgExtensionMessagesFiles['Interwiki'] = $dir . 'Interwiki.i18n.php';
$wgExtensionMessagesFiles['InterwikiAlias'] = $dir . 'Interwiki.alias.php';
$wgAutoloadClasses['SpecialInterwiki'] = $dir . 'Interwiki_body.php';
$wgAutoloadClasses['InterwikiLogFormatter'] = $dir . 'Interwiki_body.php';
$wgSpecialPages['Interwiki'] = 'SpecialInterwiki';
$wgSpecialPageGroups['Interwiki'] = 'wiki';

$wgHooks['InterwikiLoadPrefix'][] = 'wfGlobalInterwikis';


function setupInterwikiExtension() {
	global $wgInterwikiViewOnly;

	if ( $wgInterwikiViewOnly === false ) {
		global $wgAvailableRights, $wgLogTypes, $wgLogActionsHandlers;

		// New user right, required to modify the interwiki table through Special:Interwiki
		$wgAvailableRights[] = 'interwiki';

		// Set up the new log type - interwiki actions are logged to this new log
		$wgLogTypes[] = 'interwiki';
		// interwiki, iw_add, iw_delete, iw_edit
		$wgLogActionsHandlers['interwiki/*'] = 'InterwikiLogFormatter';
	}

	return true;
}

function wfGlobalInterwikis( $prefix, &$iwData ) {
	global $wgInterwikiCentralDB;
	// docs/hooks.txt says: Return true without providing an interwiki to continue interwiki search.
	if ( $wgInterwikiCentralDB === null || $wgInterwikiCentralDB === wfWikiId() ) {
		// No global set or this is global, nothing to add
		return true;
	}
	if ( !Language::fetchLanguageName( $prefix ) ) {
		// Check if prefix exists locally and skip
		foreach ( Interwiki::getAllPrefixes( null ) as $id => $localPrefixInfo ) {
			if ( $prefix === $localPrefixInfo['iw_prefix'] ) {
				return true;
			}
		}
		$dbr = wfGetDB( DB_SLAVE, array(), $wgInterwikiCentralDB );
		$res = $dbr->selectRow(
			'interwiki',
			'*',
			array( 'iw_prefix' => $prefix ),
			__METHOD__
		);
		if ( !$res ) {
			return true;
		}
		// Excplicitly make this an array since it's expected to be one
		$iwData = (array)$res;
		// At this point, we can safely return false because we know that we have something
		return false;
	}
	return true;
}