<?php

use Tiki\Installer\Installer;

/**
 * In some upgrade cases pages without a name can cause a "No wiki page specified" error on tiki-index.php
 * Also the pref wikiHomePage can be set to NULL causing the same error
 *
 * @param Installer $installer
 */
function upgrade_20171016_no_homepage_specificed_tiki($installer)
{
    $tiki_pages = $installer->table('tiki_pages');

    $namelessPages = $tiki_pages->fetchAll(['page_id'], ['pageName' => '']);

    foreach ($namelessPages as $page) {
        $tiki_pages->update(
            [
                'pageName' => "Page id #{$page['page_id']}",
                'comment' => 'Renamed by installer 20171016_no_homepage_specificed_tiki (pageName was empty)',
            ],
            [
                'page_id' => $page['page_id'],
            ]
        );
    }

    // null value prefs (e.g. wikiHomePage) count as being set but have no value, so cause errors.
    $installer->query('DELETE FROM `tiki_preferences` WHERE ISNULL(`value`);');
}