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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\attachment;
use \phpbb\db\driver\driver_interface;
/**
 * Attachment resync class
 */
class resync
{
    /** @var driver_interface */
    protected $db;
    /** @var string Attachment table SQL ID */
    private $attach_sql_id;
    /** @var string Resync table SQL ID  */
    private $resync_sql_id;
    /** @var string Resync SQL table */
    private $resync_table;
    /** @var string SQL where statement */
    private $sql_where;
    /**
     * Constructor for attachment resync class
     *
     * @param driver_interface $db Database driver
     */
    public function __construct(driver_interface $db)
    {
        $this->db = $db;
    }
    /**
     * Set type constraints for attachment resync
     *
     * @param string $type Type of resync; can be: message|post|topic
     */
    protected function set_type_constraints($type)
    {
        switch ($type)
        {
            case 'message':
                $this->attach_sql_id = 'post_msg_id';
                $this->sql_where = ' AND in_message = 1
                    AND is_orphan = 0';
                $this->resync_table = PRIVMSGS_TABLE;
                $this->resync_sql_id = 'msg_id';
            break;
            case 'post':
                $this->attach_sql_id = 'post_msg_id';
                $this->sql_where = ' AND in_message = 0
                    AND is_orphan = 0';
                $this->resync_table = POSTS_TABLE;
                $this->resync_sql_id = 'post_id';
            break;
            case 'topic':
                $this->attach_sql_id = 'topic_id';
                $this->sql_where = ' AND is_orphan = 0';
                $this->resync_table = TOPICS_TABLE;
                $this->resync_sql_id = 'topic_id';
            break;
        }
    }
    /**
     * Resync specified type
     *
     * @param string $type Type of resync
     * @param array $ids IDs to resync
     */
    public function resync($type, $ids)
    {
        if (empty($type) || !is_array($ids) || !count($ids) || !in_array($type, array('post', 'topic', 'message')))
        {
            return;
        }
        $this->set_type_constraints($type);
        // Just check which elements are still having an assigned attachment
        // not orphaned by querying the attachments table
        $sql = 'SELECT ' . $this->attach_sql_id . '
            FROM ' . ATTACHMENTS_TABLE . '
            WHERE ' . $this->db->sql_in_set($this->attach_sql_id, $ids)
                . $this->sql_where;
        $result = $this->db->sql_query($sql);
        $remaining_ids = array();
        while ($row = $this->db->sql_fetchrow($result))
        {
            $remaining_ids[] = $row[$this->attach_sql_id];
        }
        $this->db->sql_freeresult($result);
        // Now only unset those ids remaining
        $ids = array_diff($ids, $remaining_ids);
        if (count($ids))
        {
            $sql = 'UPDATE ' . $this->resync_table . '
                SET ' . $type . '_attachment = 0
                WHERE ' . $this->db->sql_in_set($this->resync_sql_id, $ids);
            $this->db->sql_query($sql);
        }
    }
}