<?php

abstract class App_ECommerce_Checkout_Abstract_Obj extends Qs_Db_Obj
{
    protected $_tableAlias = 'Transaction';
    const TRANSACTION_NAMESPACE = 'App_ECommerce_Checkout';

    /**
     * Starting transaction and save transaction id to session
     *
     * @return App_ECommerce_Checkout_Abstract_Obj
     */
    public function startTransaction()
    {
        $this->saveTransactionId($this->getPrimaryKey());
        return $this;
    }

    /**
     * Save transaction id to session
     *
     * @param int $id
     * @return App_ECommerce_Checkout_Abstract_Obj
     */
    public function saveTransactionId($id)
    {
        $session = new Qs_Session_Namespace(self::TRANSACTION_NAMESPACE);
        $session->setExpirationHops(1);
        $session->id = $id;
        return $this;
    }

    /**
     * Return and remove transaction id from session
     *
     * @return int
     */
    public function getTransactionId()
    {
        $session = new Qs_Session_Namespace(self::TRANSACTION_NAMESPACE);
        return $session->id;
    }

    /**
     * Cancel transaction and remove transaction data
     *
     * @return App_ECommerce_Checkout_Abstract_Obj
     */
    public function cancelTransaction()
    {
        if (null !== ($id = $this->getTransactionId())) {
            $this->setPrimaryKey($id);
            $this->delete();
        }
        return $this;
    }
}