<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\db\concern;

use think\db\BaseQuery;

/**
 * 事务支持
 */
trait Transaction
{

    /**
     * 执行数据库Xa事务
     * @access public
     * @param  callable $callback 数据操作方法回调
     * @param  array    $dbs      多个查询对象或者连接对象
     * @return mixed
     * @throws PDOException
     * @throws \Exception
     * @throws \Throwable
     */
    public function transactionXa($callback, array $dbs = [])
    {
        $xid = uniqid('xa');

        if (empty($dbs)) {
            $dbs[] = $this->getConnection();
        }

        foreach ($dbs as $key => $db) {
            if ($db instanceof BaseQuery) {
                $db = $db->getConnection();

                $dbs[$key] = $db;
            }

            $db->startTransXa($xid);
        }

        try {
            $result = null;
            if (is_callable($callback)) {
                $result = call_user_func_array($callback, [$this]);
            }

            foreach ($dbs as $db) {
                $db->prepareXa($xid);
            }

            foreach ($dbs as $db) {
                $db->commitXa($xid);
            }

            return $result;
        } catch (\Exception | \Throwable $e) {
            foreach ($dbs as $db) {
                $db->rollbackXa($xid);
            }
            throw $e;
        }
    }

    /**
     * 执行数据库事务
     * @access public
     * @param callable $callback 数据操作方法回调
     * @return mixed
     */
    public function transaction(callable $callback)
    {
        return $this->connection->transaction($callback);
    }

    /**
     * 启动事务
     * @access public
     * @return void
     */
    public function startTrans(): void
    {
        $this->connection->startTrans();
    }

    /**
     * 用于非自动提交状态下面的查询提交
     * @access public
     * @return void
     * @throws PDOException
     */
    public function commit(): void
    {
        $this->connection->commit();
    }

    /**
     * 事务回滚
     * @access public
     * @return void
     * @throws PDOException
     */
    public function rollback(): void
    {
        $this->connection->rollback();
    }

}