<?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_Catalog
 * @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)
 */

/**
 * New products block
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Catalog_Block_Product_New extends Mage_Catalog_Block_Product_Abstract
{
    protected $_productsCount = null;

    const DEFAULT_PRODUCTS_COUNT = 5;

    /**
     * Initialize block's cache
     */
    protected function _construct()
    {
        parent::_construct();
        $this->addData(array(
            'cache_lifetime'    => 86400,
            'cache_tags'        => array(Mage_Catalog_Model_Product::CACHE_TAG),
        ));
    }

    /**
     * Get Key pieces for caching block content
     *
     * @return array
     */
    public function getCacheKeyInfo()
    {
        return array(
           'CATALOG_PRODUCT_NEW',
           Mage::app()->getStore()->getId(),
           Mage::getDesign()->getPackageName(),
           Mage::getDesign()->getTheme('template'),
           Mage::getSingleton('customer/session')->getCustomerGroupId(),
           'template' => $this->getTemplate(),
           $this->getProductsCount()
        );
    }

    /**
     * Prepare collection with new products and applied page limits.
     *
     * return Mage_Catalog_Block_Product_New
     */
    protected function _beforeToHtml()
    {
        $todayDate  = Mage::app()->getLocale()->date()->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);

        $collection = Mage::getResourceModel('catalog/product_collection');
        $collection->setVisibility(Mage::getSingleton('catalog/product_visibility')->getVisibleInCatalogIds());

        $collection = $this->_addProductAttributesAndPrices($collection)
            ->addStoreFilter()
            ->addAttributeToFilter('news_from_date', array('date' => true, 'to' => $todayDate))
            ->addAttributeToFilter('news_to_date', array('or'=> array(
                0 => array('date' => true, 'from' => $todayDate),
                1 => array('is' => new Zend_Db_Expr('null')))
            ), 'left')
            ->addAttributeToSort('news_from_date', 'desc')
            ->setPageSize($this->getProductsCount())
            ->setCurPage(1)
        ;

        $this->setProductCollection($collection);

        return parent::_beforeToHtml();
    }

    /**
     * Set how much product should be displayed at once.
     *
     * @param $count
     * @return Mage_Catalog_Block_Product_New
     */
    public function setProductsCount($count)
    {
        $this->_productsCount = $count;
        return $this;
    }

    /**
     * Get how much products should be displayed at once.
     *
     * @return int
     */
    public function getProductsCount()
    {
        if (null === $this->_productsCount) {
            $this->_productsCount = self::DEFAULT_PRODUCTS_COUNT;
        }
        return $this->_productsCount;
    }
}