<?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_CatalogInventory
 * @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)
 */


/**
 * Product stock qty abstarct block
 *
 * @category   Mage
 * @package    Mage_CatalogInventory
 * @author      Magento Core Team <core@magentocommerce.com>
 */
abstract class Mage_CatalogInventory_Block_Stockqty_Abstract extends Mage_Core_Block_Template
{
    const XML_PATH_STOCK_THRESHOLD_QTY = 'cataloginventory/options/stock_threshold_qty';

    /**
     * Retrieve current product object
     *
     * @return Mage_Catalog_Model_Product
     */
    protected function _getProduct()
    {
        return Mage::registry('current_product');
    }

    /**
     * Retrieve current product stock qty
     *
     * @return float
     */
    public function getStockQty()
    {
        if (!$this->hasData('product_stock_qty')) {
            $qty = 0;
            if ($stockItem = $this->_getProduct()->getStockItem()) {
                $qty = (float) $stockItem->getStockQty();
            }
            $this->setData('product_stock_qty', $qty);
        }
        return $this->getData('product_stock_qty');
    }

    /**
     * Retrieve threshold of qty to display stock qty message
     *
     * @return string
     */
    public function getThresholdQty()
    {
        if (!$this->hasData('threshold_qty')) {
            $qty = (float) Mage::getStoreConfig(self::XML_PATH_STOCK_THRESHOLD_QTY);
            $this->setData('threshold_qty', $qty);
        }
        return $this->getData('threshold_qty');
    }

    /**
     * Retrieve id of message placeholder in template
     *
     * @return string
     */
    public function getPlaceholderId()
    {
        return 'stock-qty-' . $this->_getProduct()->getId();
    }

    /**
     * Retrieve visibility of stock qty message
     *
     * @return bool
     */
    public function isMsgVisible()
    {
        return ($this->getStockQty() > 0 && $this->getStockQty() <= $this->getThresholdQty());
    }

}