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<?php
/**
 *
 * This file is part of the phpBB Forum Software package.
 *
 * @copyright (c) phpBB Limited <https://www.phpbb.com>
 * @license GNU General Public License, version 2 (GPL-2.0)
 *
 * For full copyright and license information, please see
 * the docs/CREDITS.txt file.
 *
 */
namespace phpbb\db\migration\data\v31x;
class remove_duplicate_migrations extends \phpbb\db\migration\migration
{
    static public function depends_on()
    {
        return array('\phpbb\db\migration\data\v31x\v3110');
    }
    public function update_data()
    {
        return array(
            array('custom', array(array($this, 'deduplicate_entries'))),
        );
    }
    public function deduplicate_entries()
    {
        $migration_state = array();
        $duplicate_migrations = array();
        $sql = "SELECT *
            FROM " . $this->table_prefix . 'migrations';
        $result = $this->db->sql_query($sql);
        if (!$this->db->get_sql_error_triggered())
        {
            while ($migration = $this->db->sql_fetchrow($result))
            {
                $migration_state[$migration['migration_name']] = $migration;
                $migration_state[$migration['migration_name']]['migration_depends_on'] = unserialize($migration['migration_depends_on']);
            }
        }
        $this->db->sql_freeresult($result);
        foreach ($migration_state as $name => $migration)
        {
            $prepended_name = ($name[0] == '\\' ? '' : '\\') . $name;
            $prefixless_name = $name[0] == '\\' ? substr($name, 1) : $name;
            if ($prepended_name != $name && isset($migration_state[$prepended_name]) && $migration_state[$prepended_name]['migration_depends_on'] == $migration_state[$name]['migration_depends_on'])
            {
                $duplicate_migrations[] = $name;
                unset($migration_state[$prepended_name]);
            }
            else if ($prefixless_name != $name && isset($migration_state[$prefixless_name]) && $migration_state[$prefixless_name]['migration_depends_on'] == $migration_state[$name]['migration_depends_on'])
            {
                $duplicate_migrations[] = $prefixless_name;
                unset($migration_state[$prefixless_name]);
            }
        }
        if (count($duplicate_migrations))
        {
            $sql = 'DELETE
                FROM ' . $this->table_prefix . 'migrations
                WHERE '  . $this->db->sql_in_set('migration_name', $duplicate_migrations);
            $this->db->sql_query($sql);
        }
    }
}