<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Core
 * @copyright   Copyright (c) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Config data model
 *
 * @category   Mage
 * @package    Mage_Core
 */
class Mage_Core_Model_Config_Data extends Mage_Core_Model_Abstract
{
    const ENTITY = 'core_config_data';
    /**
     * Prefix of model events names
     *
     * @var string
     */
    protected $_eventPrefix = 'core_config_data';

    /**
     * Parameter name in event
     *
     * In observe method you can use $observer->getEvent()->getObject() in this case
     *
     * @var string
     */
    protected $_eventObject = 'config_data';

    /**
     * Varien model constructor
     */
    protected function _construct()
    {
        $this->_init('core/config_data');
    }

    /**
     * Add availability call after load as public
     */
    public function afterLoad()
    {
        $this->_afterLoad();
    }

    /**
     * Check if config data value was changed
     *
     * @return bool
     */
    public function isValueChanged()
    {
        return $this->getValue() != $this->getOldValue();
    }

    /**
     * Get old value from existing config
     *
     * @return string
     */
    public function getOldValue()
    {
        $storeCode   = $this->getStoreCode();
        $websiteCode = $this->getWebsiteCode();
        $path        = $this->getPath();

        if ($storeCode) {
            return Mage::app()->getStore($storeCode)->getConfig($path);
        }
        if ($websiteCode) {
            return Mage::app()->getWebsite($websiteCode)->getConfig($path);
        }
        return (string) Mage::getConfig()->getNode('default/' . $path);
    }
    

     /**
     * Get value by key for new user data from <section>/groups/<group>/fields/<field>
     * 
     * @return string
     */
    public function getFieldsetDataValue($key)
    {
        $data = $this->_getData('fieldset_data');
        return (is_array($data) && isset($data[$key])) ? $data[$key] : null;
    }
}