<?php
/*
* 2007-2013 PrestaShop
*
* 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@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class ProductDownloadCore extends ObjectModel
{
	/** @var integer Product id which download belongs */
	public $id_product;

	/** @var string DisplayFilename the name which appear */
	public $display_filename;

	/** @var string PhysicallyFilename the name of the file on hard disk */
	public $filename;

	/** @var string DateDeposit when the file is upload */
	public $date_add;

	/** @var string DateExpiration deadline of the file */
	public $date_expiration;

	/** @var string NbDaysAccessible how many days the customer can access to file */
	public $nb_days_accessible;

	/** @var string NbDownloadable how many time the customer can download the file */
	public $nb_downloadable;

	/** @var boolean Active if file is accessible or not */
	public $active = 1;

	/** @var boolean is_shareable indicates whether the product can be shared */
	public $is_shareable = 0;

	protected static $_productIds = array();

	/**
	 * @see ObjectModel::$definition
	 */
	public static $definition = array(
		'table' => 'product_download',
		'primary' => 'id_product_download',
		'fields' => array(
			'id_product' => 			array('type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true),
			'display_filename' => 		array('type' => self::TYPE_STRING, 'validate' => 'isGenericName', 'size' => 255),
			'filename' => 				array('type' => self::TYPE_STRING, 'validate' => 'isSha1', 'size' => 255),
			'date_add' => 				array('type' => self::TYPE_DATE, 'validate' => 'isDate'),
			'date_expiration' => 		array('type' => self::TYPE_DATE, 'validate' => 'isDate'),
			'nb_days_accessible' => 	array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'size' => 10),
			'nb_downloadable' => 		array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'size' => 10),
			'active' => 				array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
			'is_shareable' => 			array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
		),
	);

	/**
	 * Build a virtual product
	 *
	 * @param integer $id_product_download Existing productDownload id in order to load object (optional)
	 */
	public function __construct($id_product_download = null)
	{
		parent::__construct($id_product_download);
		// @TODO check if the file is present on hard drive
	}

	/**
	 * @see ObjectModel::getFields()
	 * @return array
	 */
	public function getFields()
	{
		$fields = parent::getFields();
		if (!$fields['date_expiration'])
			$fields['date_expiration'] = '0000-00-00 00:00:00';

		return $fields;
	}

	public function add($autodate = true, $null_values = false)
	{
		if (parent::add($autodate, $null_values))
		{
			// Set cache of feature detachable to true
			if ($this->active)
				Configuration::updateGlobalValue('PS_VIRTUAL_PROD_FEATURE_ACTIVE', '1');
			return true;
		}
		return false;
	}

	public function update($null_values = false)
	{
		if (parent::update($null_values))
		{
			// Refresh cache of feature detachable because the row can be deactive
			Configuration::updateGlobalValue('PS_VIRTUAL_PROD_FEATURE_ACTIVE', ProductDownload::isCurrentlyUsed($this->def['table'], true));
			return true;
		}
		return false;
	}

	public function delete($delete = false)
	{
		$result = parent::delete();
		if ($result && $delete)
			return $this->deleteFile();
		return $result;
	}

	/**
	 * Delete the file
	 * @param int $id_product_download : if we need to delete a specific product attribute file
	 *
	 * @return boolean
	 */
	public function deleteFile($id_product_download = null)
	{
		if (!$this->checkFile())
			return false;

		return unlink(_PS_DOWNLOAD_DIR_.$this->filename)
			&& Db::getInstance()->delete('product_download', 'id_product_download = '.(int)$id_product_download);
	}

	/**
	 * Check if file exists
	 *
	 * @return boolean
	 */
	public function checkFile()
	{
		if (!$this->filename) return false;
		return file_exists(_PS_DOWNLOAD_DIR_.$this->filename);
	}

	/**
	 * Check if download repository is writable
	 *
	 * @return boolean
	 */
	public static function checkWritableDir()
	{
		return is_writable(_PS_DOWNLOAD_DIR_);
	}

	/**
	 * Return the id_product_download from an id_product
	 *
	 * @param int $id_product Product the id
	 * @return integer Product the id for this virtual product
	 */
	public static function getIdFromIdProduct($id_product)
	{
		if (!ProductDownload::isFeatureActive())
			return false;
		if (array_key_exists((int)$id_product, self::$_productIds))
			return self::$_productIds[$id_product];
		self::$_productIds[$id_product] = (int)Db::getInstance()->getValue('
		SELECT `id_product_download`
		FROM `'._DB_PREFIX_.'product_download`
		WHERE `id_product` = '.(int)$id_product.' 
		AND `active` = 1
		ORDER BY `id_product_download` DESC');

		return self::$_productIds[$id_product];
	}

	/**
	 * Return the display filename from a physical filename
	 *
	 * @since 1.5.0.1
	 *
	 * @param string $filename Filename physically
	 * @return integer Product the id for this virtual product
	 *
	 */
	public static function getIdFromFilename($filename)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
		SELECT `id_product_download`
		FROM `'._DB_PREFIX_.'product_download`
		WHERE `filename` = \''.pSQL($filename).'\'');
	}

	/**
	 * Return the filename from an id_product
	 *
	 * @param int $id_product Product the id
	 * @return string Filename the filename for this virtual product
	 */
	public static function getFilenameFromIdProduct($id_product)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
			SELECT `filename`
			FROM `'._DB_PREFIX_.'product_download`
			WHERE `id_product` = '.(int)$id_product.'
				AND `active` = 1
		');
	}

	/**
	 * Return the display filename from a physical filename
	 *
	 * @param string $filename Filename physically
	 * @return string Filename the display filename for this virtual product
	 */
	public static function getFilenameFromFilename($filename)
	{
		return Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
		SELECT `display_filename`
		FROM `'._DB_PREFIX_.'product_download`
		WHERE `filename` = \''.pSQL($filename).'\'');
	}

	/**
	 * Return html link
	 *
	 * @param string $class CSS selector (optionnal)
	 * @param bool $admin specific to backend (optionnal)
	 * @param string $hash hash code in table order detail (optionnal)
	 * @return string Html all the code for print a link to the file
	 */
	public function getTextLink($admin = true, $hash = false)
	{
		$key = $this->filename.'-'.($hash ? $hash : 'orderdetail');
		$link = ($admin) ? 'get-file-admin.php?' : _PS_BASE_URL_.__PS_BASE_URI__.'index.php?controller=get-file&';
		$link .= ($admin) ? 'file='.$this->filename : 'key='.$key;
		return $link;
	}

	/**
	 * Return html link
	 *
	 * @param string $class CSS selector
	 * @param bool $admin specific to backend
	 * @param bool $hash hash code in table order detail
	 * @return string Html all the code for print a link to the file
	 */
	public function getHtmlLink($class = false, $admin = true, $hash = false)
	{
		$link = $this->getTextLink($admin, $hash);
		$html = '<a href="'.$link.'" title=""';
		if ($class)
			$html .= ' class="'.$class.'"';
		$html .= '>'.$this->display_filename.'</a>';
		return $html;
	}

	/**
	 * Return a deadline
	 *
	 * @return string Datetime in SQL format
	 */
	public function getDeadline()
	{
		if (!(int)$this->nb_days_accessible)
			return '0000-00-00 00:00:00';
		$timestamp = strtotime('+'.(int)$this->nb_days_accessible.' day');
		return date('Y-m-d H:i:s', $timestamp);
	}

	/**
	 * Return a hash for control download access
	 *
	 * @return string Hash ready to insert in database
	 */
	public function getHash()
	{
		// TODO check if this hash not already in database
		return sha1(microtime().$this->id);
	}

	/**
	 * Return a sha1 filename
	 *
	 * @return string Sha1 unique filename
	 */
	public static function getNewFilename()
	{
		do {
			$filename = sha1(microtime());
		} while (file_exists(_PS_DOWNLOAD_DIR_.$filename));
		return $filename;
	}

	/**
	 * This method is allow to know if a feature is used or active
	 * @since 1.5.0.1
	 * @return bool
	 */
	public static function isFeatureActive()
	{
		return Configuration::get('PS_VIRTUAL_PROD_FEATURE_ACTIVE');
	}
}
