<?php
/*
 *  2007-2014 PrestaShop
 *
 * NOTICE OF LICENSE
 * This source file is subject to the Academic Free License (AFL 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/afl-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  2007-2014 PrestaShop SA
 *  @version  Release: $Revision: 7515 $
 *  @license    http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
 *  International Registered Trademark & Property of PrestaShop SA
 */

if (!defined('_PS_VERSION_'))
	exit;

class Gsitemap extends Module
{
	const HOOK_ADD_URLS = 'gSitemapAppendUrls';

	public $cron = false;
	private $sql_checks = array();

	public function __construct()
	{
		$this->name = 'gsitemap';
		$this->tab = 'seo';
		$this->version = '3.0.3';
		$this->author = 'PrestaShop';
		$this->need_instance = 0;

		parent::__construct();

		$this->displayName = $this->l('Google sitemap');
		$this->description = $this->l('Generate your Google sitemap file');

		$this->type_array = array('home', 'meta', 'product', 'category', 'manufacturer', 'supplier', 'cms', 'module');

		$metas = Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'meta` ORDER BY `id_meta` ASC');
		$disabled_metas = explode(',', Configuration::get('GSITEMAP_DISABLE_LINKS'));
		foreach ($metas as $meta)
			if (in_array($meta['id_meta'], $disabled_metas))
				if (($key = array_search($meta['page'], $this->type_array)) !== false)
					unset($this->type_array[$key]);

	}

	/**
	 * Google Sitemap installation process:
	 *
	 * Step 1 - Pre-set Configuration option values
	 * Step 2 - Install the Addon and create a database table to store Sitemap files name by shop
	 *
	 * @return boolean Installation result
	 */
	public function install()
	{
		foreach (array(
			'GSITEMAP_PRIORITY_HOME' => 1.0,
			'GSITEMAP_PRIORITY_PRODUCT' => 0.9,
			'GSITEMAP_PRIORITY_CATEGORY' => 0.8,
			'GSITEMAP_PRIORITY_MANUFACTURER' => 0.7,
			'GSITEMAP_PRIORITY_SUPPLIER' => 0.6,
			'GSITEMAP_PRIORITY_CMS' => 0.5,
			'GSITEMAP_FREQUENCY' => 'weekly',
			'GSITEMAP_CHECK_IMAGE_FILE' => false,
			'GSITEMAP_LAST_EXPORT' => false
		) as $key => $val)
			if (!Configuration::updateValue($key, $val))
				return false;

		return parent::install() &&
		Db::getInstance()->Execute('CREATE TABLE IF NOT EXISTS `'._DB_PREFIX_.'gsitemap_sitemap` (`link` varchar(255) DEFAULT NULL, `id_shop` int(11) DEFAULT 0) ENGINE='._MYSQL_ENGINE_.' DEFAULT CHARSET=utf8;') &&
		$this->_installHook();
	}

	/**
	 * Registers hook(s)
	 *
	 * @return boolean
	 */
	private function _installHook()
	{
		$hook = new Hook();
		$hook->name = self::HOOK_ADD_URLS;
		$hook->title = 'GSitemap Append URLs';
		$hook->description = 'This hook allows a module to add URLs to a generated sitemap';
		$hook->position = true;
		return $hook->save();
	}

	/**
	 * Google Sitemap uninstallation process:
	 *
	 * Step 1 - Remove Configuration option values from database
	 * Step 2 - Remove the database containing the generated Sitemap files names
	 * Step 3 - Uninstallation of the Addon itself
	 *
	 * @return boolean Uninstallation result
	 */
	public function uninstall()
	{
		foreach (array(
			'GSITEMAP_PRIORITY_HOME' => '',
			'GSITEMAP_PRIORITY_PRODUCT' => '',
			'GSITEMAP_PRIORITY_CATEGORY' => '',
			'GSITEMAP_PRIORITY_MANUFACTURER' => '',
			'GSITEMAP_PRIORITY_SUPPLIER' => '',
			'GSITEMAP_PRIORITY_CMS' => '',
			'GSITEMAP_FREQUENCY' => '',
			'GSITEMAP_CHECK_IMAGE_FILE' => '',
			'GSITEMAP_LAST_EXPORT' => ''
		) as $key => $val)
			if (!Configuration::deleteByName($key))
				return false;

		$hook = new Hook(Hook::getIdByName(self::HOOK_ADD_URLS));
		if (Validate::isLoadedObject($hook))
			$hook->delete();

		return parent::uninstall() && $this->removeSitemap();
	}

	/**
	 * Delete all the generated Sitemap files  and drop the addon table.
	 * @return boolean
	 */
	public function removeSitemap()
	{
		$links = Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'gsitemap_sitemap`');
		if ($links)
			foreach ($links as $link)
				if (!@unlink($this->normalizeDirectory(_PS_ROOT_DIR_).$link['link']))
					return false;
		if (!Db::getInstance()->Execute('DROP TABLE `'._DB_PREFIX_.'gsitemap_sitemap`'))
			return false;

		return true;
	}

	public function getContent()
	{
		/* Store the posted parameters and generate a new Google Sitemap files for the current Shop */
		if (Tools::isSubmit('SubmitGsitemap'))
		{
			Configuration::updateValue('GSITEMAP_FREQUENCY', pSQL(Tools::getValue('gsitemap_frequency')));
			Configuration::updateValue('GSITEMAP_INDEX_CHECK', '');
			Configuration::updateValue('GSITEMAP_CHECK_IMAGE_FILE', pSQL(Tools::getValue('gsitemap_check_image_file')));
			$meta = '';
			if (Tools::getValue('gsitemap_meta'))
				$meta .= implode(', ', Tools::getValue('gsitemap_meta'));
			Configuration::updateValue('GSITEMAP_DISABLE_LINKS', $meta);
			$this->emptySitemap();
			$this->createSitemap();
		}
		/* if no posted form and the variable [continue] is found in the HTTP request variable keep creating sitemap */
		elseif (Tools::getValue('continue'))
			$this->createSitemap();

		/* Empty the Shop domain cache */
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();

		$this->context->smarty->assign(
			array(
				'gsitemap_form' => './index.php?tab=AdminModules&configure=gsitemap&token='.Tools::getAdminTokenLite('AdminModules').'&tab_module='.$this->tab.'&module_name=gsitemap',
				'gsitemap_cron' => _PS_BASE_URL_._MODULE_DIR_.'gsitemap/gsitemap-cron.php?token='.substr(Tools::encrypt('gsitemap/cron'), 0, 10).'&id_shop='.$this->context->shop->id,
				'gsitemap_feed_exists' => file_exists($this->normalizeDirectory(_PS_ROOT_DIR_).'index_sitemap.xml'),
				'gsitemap_last_export' => Configuration::get('GSITEMAP_LAST_EXPORT'),
				'gsitemap_frequency' => Configuration::get('GSITEMAP_FREQUENCY'),
				'gsitemap_store_url' => 'http://'.Tools::getShopDomain(false, true).__PS_BASE_URI__,
				'gsitemap_links' => Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'gsitemap_sitemap` WHERE id_shop = '.(int)$this->context->shop->id),
				'store_metas' => Meta::getMetasByIdLang((int)$this->context->cookie->id_lang),
				'gsitemap_disable_metas' => explode(',', Configuration::get('GSITEMAP_DISABLE_LINKS')),
				'gsitemap_customer_limit' => array(
					'max_exec_time' => (int)ini_get('max_execution_time'),
					'memory_limit' => intval(ini_get('memory_limit'))
				),
				'prestashop_ssl' => Configuration::get('PS_SSL_ENABLED'),
				'gsitemap_check_image_file' => Configuration::get('GSITEMAP_CHECK_IMAGE_FILE'),
				'shop' => $this->context->shop
			)
		);

		return $this->display(__FILE__, 'views/templates/admin/configuration.tpl');
	}

	/**
	 * Delete all the generated Sitemap files from the files system and the database.
	 *
	 * @param int $id_shop
	 *
	 * @return bool
	 */
	public function emptySitemap($id_shop = 0)
	{
		if (!isset($this->context))
			$this->context = new Context();
		if ($id_shop != 0)
			$this->context->shop = new Shop((int)$id_shop);
		$links = Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'gsitemap_sitemap` WHERE id_shop = '.(int)$this->context->shop->id);
		if ($links)
		{
			foreach ($links as $link)
				@unlink($this->normalizeDirectory(_PS_ROOT_DIR_).$link['link']);

			return Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'gsitemap_sitemap` WHERE id_shop = '.(int)$this->context->shop->id);
		}

		return true;
	}

	/**
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param array  $new_link     contain the link elements
	 * @param string $lang         language of link to add
	 * @param int    $index        index of the current Google Sitemap file
	 * @param int    $i            count of elements added to sitemap main array
	 * @param int    $id_obj       identifier of the object of the link to be added to the Gogle Sitemap file
	 *
	 * @return bool
	 */
	public function _addLinkToSitemap(&$link_sitemap, $new_link, $lang, &$index, &$i, $id_obj)
	{
		if ($i <= 25000 && memory_get_usage() < 100000000)
		{
			$link_sitemap[] = $new_link;
			$i++;

			return true;
		}
		else
		{
			$this->_recursiveSitemapCreator($link_sitemap, $lang, $index);
			if ($index % 20 == 0 && !$this->cron)
			{
				$this->context->smarty->assign(
					array(
						'gsitemap_number' => (int)$index,
						'gsitemap_refresh_page' => './index.php?tab=AdminModules&configure=gsitemap&token='.Tools::getAdminTokenLite('AdminModules').'&tab_module='.$this->tab.'&module_name=gsitemap&continue=1&type='.$new_link['type'].'&lang='.$lang.'&index='.$index.'&id='.intval($id_obj).'&id_shop='.$this->context->shop->id
					)
				);

				return false;
			}
			else if ($index % 20 == 0 && $this->cron)
			{
				header('Refresh: 5; url=http'.(Configuration::get('PS_SSL_ENABLED') ? 's' : '').'://'.Tools::getShopDomain(false, true).__PS_BASE_URI__.'modules/gsitemap/gsitemap-cron.php?continue=1&token='.substr(Tools::encrypt('gsitemap/cron'), 0, 10).'&type='.$new_link['type'].'&lang='.$lang.'&index='.$index.'&id='.intval($id_obj).'&id_shop='.$this->context->shop->id);
				die();
			}
			else
			{
				if ($this->cron)
					header('location: http'.(Configuration::get('PS_SSL_ENABLED') ? 's' : '').'://'.Tools::getShopDomain(false, true).__PS_BASE_URI__.'modules/gsitemap/gsitemap-cron.php?continue=1&token='.substr(Tools::encrypt('gsitemap/cron'), 0, 10).'&type='.$new_link['type'].'&lang='.$lang.'&index='.$index.'&id='.intval($id_obj).'&id_shop='.$this->context->shop->id);
				else
				{
					$admin_folder = str_replace(_PS_ROOT_DIR_, '', _PS_ADMIN_DIR_);
					$admin_folder = substr($admin_folder, 1);
					header('location: http'.(Configuration::get('PS_SSL_ENABLED') ? 's' : '').'://'.Tools::getShopDomain(false, true).__PS_BASE_URI__.$admin_folder.'/index.php?tab=AdminModules&configure=gsitemap&token='.Tools::getAdminTokenLite('AdminModules').'&tab_module='.$this->tab.'&module_name=gsitemap&continue=1&type='.$new_link['type'].'&lang='.$lang.'&index='.$index.'&id='.intval($id_obj).'&id_shop='.$this->context->shop->id);
				}
				die();
			}
		}
	}

	/**
	 * Hydrate $link_sitemap with home link
	 *
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         language of link to add
	 * @param int    $index        index of the current Google Sitemap file
	 * @param int    $i            count of elements added to sitemap main array
	 *
	 * @return bool
	 */
	private function _getHomeLink(&$link_sitemap, $lang, &$index, &$i)
	{
		if (Configuration::get('PS_SSL_ENABLED') && Configuration::get('PS_SSL_ENABLED_EVERYWHERE'))
			$protocol = 'https://';
		else
			$protocol = 'http://';

		return $this->_addLinkToSitemap(
			$link_sitemap, array(
				'type' => 'home',
				'page' => 'home',
				'link' => $protocol.Tools::getShopDomainSsl(false).$this->context->shop->getBaseURI().(method_exists('Language', 'isMultiLanguageActivated') ? Language::isMultiLanguageActivated() ? $lang['iso_code'].'/' : '' : ''),
				'image' => false
			), $lang['iso_code'], $index, $i, -1
		);
	}

	/**
	 * Hydrate $link_sitemap with meta link
	 *
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         language of link to add
	 * @param int    $index        index of the current Google Sitemap file
	 * @param int    $i            count of elements added to sitemap main array
	 * @param int    $id_meta      meta object identifier
	 *
	 * @return bool
	 */
	private function _getMetaLink(&$link_sitemap, $lang, &$index, &$i, $id_meta = 0)
	{
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();
		$link = new Link();
		if (version_compare(_PS_VERSION_, '1.6', '>='))
			$metas = Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'meta` WHERE `configurable` > 0 AND `id_meta` >= '.(int)$id_meta.' ORDER BY `id_meta` ASC');
		else
			$metas = Db::getInstance()->ExecuteS('SELECT * FROM `'._DB_PREFIX_.'meta` WHERE `id_meta` >= '.(int)$id_meta.' ORDER BY `id_meta` ASC');
		foreach ($metas as $meta)
		{
			$url = '';
			if (!in_array($meta['id_meta'], explode(',', Configuration::get('GSITEMAP_DISABLE_LINKS'))))
			{
				$url_rewrite = Db::getInstance()->getValue('SELECT url_rewrite, id_shop FROM `'._DB_PREFIX_.'meta_lang` WHERE `id_meta` = '.(int)$meta['id_meta'].' AND `id_shop` ='.(int)$this->context->shop->id.' AND `id_lang` = '.(int)$lang['id_lang']);
				Dispatcher::getInstance()->addRoute($meta['page'], (isset($url_rewrite) ? $url_rewrite : $meta['page']), $meta['page'], $lang['id_lang']);
				$uri_path = Dispatcher::getInstance()->createUrl($meta['page'], $lang['id_lang'], array(), (bool)Configuration::get('PS_REWRITING_SETTINGS'));
				$url .= Tools::getShopDomainSsl(true).(($this->context->shop->virtual_uri) ? __PS_BASE_URI__.$this->context->shop->virtual_uri : __PS_BASE_URI__).(Language::isMultiLanguageActivated() ? $lang['iso_code'].'/' : '').ltrim($uri_path, '/');

				if (!$this->_addLinkToSitemap(
					$link_sitemap, array(
						'type' => 'meta',
						'page' => $meta['page'],
						'link' => $url,
						'image' => false
					), $lang['iso_code'], $index, $i, $meta['id_meta']
				))
					return false;
			}
		}

		return true;
	}

	/**
	 * Hydrate $link_sitemap with products link
	 *
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         language of link to add
	 * @param int    $index        index of the current Google Sitemap file
	 * @param int    $i            count of elements added to sitemap main array
	 * @param int    $id_product   product object identifier
	 *
	 * @return bool
	 */
	private function _getProductLink(&$link_sitemap, $lang, &$index, &$i, $id_product = 0)
	{
		$link = new Link();
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();

		$products_id = Db::getInstance()->ExecuteS('SELECT `id_product` FROM `'._DB_PREFIX_.'product_shop` WHERE `id_product` >= '.intval($id_product).' AND `active` = 1 AND `id_shop`='.$this->context->shop->id.' ORDER BY `id_product` ASC');

		foreach ($products_id as $product_id)
		{
			$product = new Product((int)$product_id['id_product'], false, (int)$lang['id_lang']);

			$url = $link->getProductLink($product, $product->link_rewrite, htmlspecialchars(strip_tags($product->category)), $product->ean13, (int)$lang['id_lang'], (int)$this->context->shop->id, 0, true);

			$id_image = Product::getCover((int)$product_id['id_product']);
			if (isset($id_image['id_image']))
			{
				$image_link = $this->context->link->getImageLink($product->link_rewrite, $product->id.'-'.(int)$id_image['id_image'], 'large_default');
				$image_link = (!in_array(rtrim(Context::getContext()->shop->virtual_uri, '/'), explode('/', $image_link))) ? str_replace(
					array(
						'https',
						Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri
					), array(
						'http',
						Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri.Context::getContext()->shop->virtual_uri
					), $image_link
				) : $image_link;
			}
			$file_headers = (Configuration::get('GSITEMAP_CHECK_IMAGE_FILE')) ? @get_headers($image_link) : true;
			$image_product = array();
			if (isset($image_link) && ($file_headers[0] != 'HTTP/1.1 404 Not Found' || $file_headers === true))
				$image_product = array(
					'title_img' => htmlspecialchars(strip_tags($product->name)),
					'caption' => htmlspecialchars(strip_tags($product->description_short)),
					'link' => $image_link
				);
			if (!$this->_addLinkToSitemap(
				$link_sitemap, array(
					'type' => 'product',
					'page' => 'product',
					'lastmod' => $product->date_upd,
					'link' => $url,
					'image' => $image_product
				), $lang['iso_code'], $index, $i, $product_id['id_product']
			))
				return false;

			unset($image_link);
		}

		return true;
	}

	/**
	 * Hydrate $link_sitemap with categories link
	 *
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         language of link to add
	 * @param int    $index        index of the current Google Sitemap file
	 * @param int    $i            count of elements added to sitemap main array
	 * @param int    $id_category  category object identifier
	 *
	 * @return bool
	 */
	private function _getCategoryLink(&$link_sitemap, $lang, &$index, &$i, $id_category = 0)
	{
		$link = new Link();
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();

		$categories_id = Db::getInstance()->ExecuteS(
			'SELECT c.id_category FROM `'._DB_PREFIX_.'category` c
				INNER JOIN `'._DB_PREFIX_.'category_shop` cs ON c.`id_category` = cs.`id_category`
				WHERE c.`id_category` >= '.intval($id_category).' AND c.`active` = 1 AND c.`id_category` != 1 AND c.id_parent > 0 AND c.`id_category` > 0 AND cs.`id_shop` = '.(int)$this->context->shop->id.' ORDER BY c.`id_category` ASC'
		);

		foreach ($categories_id as $category_id)
		{
			$category = new Category((int)$category_id['id_category'], (int)$lang['id_lang']);
			$url = $link->getCategoryLink($category, urlencode($category->link_rewrite), (int)$lang['id_lang']);

			if ($category->id_image)
			{
				$image_link = $this->context->link->getCatImageLink($category->link_rewrite, (int)$category->id_image, 'category_default');
				$image_link = (!in_array(rtrim(Context::getContext()->shop->virtual_uri, '/'), explode('/', $image_link))) ? str_replace(
					array(
						'https',
						Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri
					), array(
						'http',
						Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri.Context::getContext()->shop->virtual_uri
					), $image_link
				) : $image_link;
			}
			$file_headers = (Configuration::get('GSITEMAP_CHECK_IMAGE_FILE')) ? @get_headers($image_link) : true;
			$image_category = array();
			if (isset($image_link) && ($file_headers[0] != 'HTTP/1.1 404 Not Found' || $file_headers === true))
				$image_category = array(
					'title_img' => htmlspecialchars(strip_tags($category->name)),
					'link' => $image_link
				);

			if (!$this->_addLinkToSitemap(
				$link_sitemap, array(
					'type' => 'category',
					'page' => 'category',
					'lastmod' => $category->date_upd,
					'link' => $url,
					'image' => $image_category
				), $lang['iso_code'], $index, $i, (int)$category_id['id_category']
			))
				return false;

			unset($image_link);
		}

		return true;
	}

	/**
	 * return the link elements for the manufacturer object
	 *
	 * @param array  $link_sitemap    contain all the links for the Google Sitemap file to be generated
	 * @param string $lang            language of link to add
	 * @param int    $index           index of the current Google Sitemap file
	 * @param int    $i               count of elements added to sitemap main array
	 * @param int    $id_manufacturer manufacturer object identifier
	 *
	 * @return bool
	 */
	private function _getManufacturerLink(&$link_sitemap, $lang, &$index, &$i, $id_manufacturer = 0)
	{
		$link = new Link();
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();
		$manufacturers_id = Db::getInstance()->ExecuteS(
			'SELECT m.`id_manufacturer` FROM `'._DB_PREFIX_.'manufacturer` m
			INNER JOIN `'._DB_PREFIX_.'manufacturer_lang` ml on m.`id_manufacturer` = ml.`id_manufacturer`'.
			($this->tableColumnExists(_DB_PREFIX_.'manufacturer_shop') ? ' INNER JOIN `'._DB_PREFIX_.'manufacturer_shop` ms ON m.`id_manufacturer` = ms.`id_manufacturer` ' : '').
			' WHERE m.`active` = 1  AND m.`id_manufacturer` >= '.(int)$id_manufacturer.
			($this->tableColumnExists(_DB_PREFIX_.'manufacturer_shop') ? ' AND ms.`id_shop` = '.(int)$this->context->shop->id : '').
			' AND ml.`id_lang` = '.(int)$lang['id_lang'].
			' ORDER BY m.`id_manufacturer` ASC'
		);
		foreach ($manufacturers_id as $manufacturer_id)
		{
			$manufacturer = new Manufacturer((int)$manufacturer_id['id_manufacturer'], $lang['id_lang']);
			$url = $link->getManufacturerLink($manufacturer, $manufacturer->link_rewrite, $lang['id_lang']);

			$image_link = 'http://'.Tools::getMediaServer(_THEME_MANU_DIR_)._THEME_MANU_DIR_.((!file_exists(_PS_MANU_IMG_DIR_.'/'.(int)$manufacturer->id.'-medium_default.jpg')) ? $lang['iso_code'].'-default' : (int)$manufacturer->id).'-medium_default.jpg';
			$image_link = (!in_array(rtrim(Context::getContext()->shop->virtual_uri, '/'), explode('/', $image_link))) ? str_replace(
				array(
					'https',
					Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri
				), array(
					'http',
					Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri.Context::getContext()->shop->virtual_uri
				), $image_link
			) : $image_link;

			$file_headers = (Configuration::get('GSITEMAP_CHECK_IMAGE_FILE')) ? @get_headers($image_link) : true;
			$manifacturer_image = array();
			if ($file_headers[0] != 'HTTP/1.1 404 Not Found' || $file_headers === true)
				$manifacturer_image = array(
					'title_img' => htmlspecialchars(strip_tags($manufacturer->name)),
					'caption' => htmlspecialchars(strip_tags($manufacturer->short_description)),
					'link' => $image_link
				);
			if (!$this->_addLinkToSitemap(
				$link_sitemap, array(
					'type' => 'manufacturer',
					'page' => 'manufacturer',
					'lastmod' => $manufacturer->date_upd,
					'link' => $url,
					'image' => $manifacturer_image
				), $lang['iso_code'], $index, $i, $manufacturer_id['id_manufacturer']
			))
				return false;
		}

		return true;
	}

	/**
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         language of link to add
	 * @param int    $index        index of the current Google Sitemap file
	 * @param int    $i            count of elements added to sitemap main array
	 * @param int    $id_supplier  supplier object identifier
	 *
	 * @return bool
	 */
	private function _getSupplierLink(&$link_sitemap, $lang, &$index, &$i, $id_supplier = 0)
	{
		$link = new Link();
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();
		$suppliers_id = Db::getInstance()->ExecuteS(
			'SELECT s.`id_supplier` FROM `'._DB_PREFIX_.'supplier` s
			INNER JOIN `'._DB_PREFIX_.'supplier_lang` sl ON s.`id_supplier` = sl.`id_supplier` '.
			($this->tableColumnExists(_DB_PREFIX_.'supplier_shop') ? 'INNER JOIN `'._DB_PREFIX_.'supplier_shop` ss ON s.`id_supplier` = ss.`id_supplier`' : '').'
			WHERE s.`active` = 1 AND s.`id_supplier` >= '.(int)$id_supplier.
			($this->tableColumnExists(_DB_PREFIX_.'supplier_shop') ? ' AND ss.`id_shop` = '.(int)$this->context->shop->id : '').'
			AND sl.`id_lang` = '.(int)$lang['id_lang'].'
			ORDER BY s.`id_supplier` ASC'
		);
		foreach ($suppliers_id as $supplier_id)
		{
			$supplier = new Supplier((int)$supplier_id['id_supplier'], $lang['id_lang']);
			$url = $link->getSupplierLink($supplier, $supplier->link_rewrite, $lang['id_lang']);

			$image_link = 'http://'.Tools::getMediaServer(_THEME_SUP_DIR_)._THEME_SUP_DIR_.((!file_exists(_THEME_SUP_DIR_.'/'.(int)$supplier->id.'-medium_default.jpg')) ? $lang['iso_code'].'-default' : (int)$supplier->id).'-medium_default.jpg';
			$image_link = (!in_array(rtrim(Context::getContext()->shop->virtual_uri, '/'), explode('/', $image_link))) ? str_replace(
				array(
					'https',
					Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri
				), array(
					'http',
					Context::getContext()->shop->domain.Context::getContext()->shop->physical_uri.Context::getContext()->shop->virtual_uri
				), $image_link
			) : $image_link;

			$file_headers = (Configuration::get('GSITEMAP_CHECK_IMAGE_FILE')) ? @get_headers($image_link) : true;
			$supplier_image = array();
			if ($file_headers[0] != 'HTTP/1.1 404 Not Found' || $file_headers === true)
				$supplier_image = array(
					'title_img' => htmlspecialchars(strip_tags($supplier->name)),
					'link' => 'http'.(Configuration::get('PS_SSL_ENABLED') ? 's' : '').'://'.Tools::getMediaServer(_THEME_SUP_DIR_)._THEME_SUP_DIR_.((!file_exists(_THEME_SUP_DIR_.'/'.(int)$supplier->id.'-medium_default.jpg')) ? $lang['iso_code'].'-default' : (int)$supplier->id).'-medium_default.jpg'
				);
			if (!$this->_addLinkToSitemap(
				$link_sitemap, array(
					'type' => 'supplier',
					'page' => 'supplier',
					'lastmod' => $supplier->date_upd,
					'link' => $url,
					'image' => $supplier_image
				), $lang['iso_code'], $index, $i, $supplier_id['id_supplier']
			))
				return false;
		}

		return true;
	}

	/**
	 * return the link elements for the CMS object
	 *
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         the language of link to add
	 * @param int    $index        the index of the current Google Sitemap file
	 * @param int    $i            the count of elements added to sitemap main array
	 * @param int    $id_cms       the CMS object identifier
	 *
	 * @return bool
	 */
	private function _getCmsLink(&$link_sitemap, $lang, &$index, &$i, $id_cms = 0)
	{
		$link = new Link();
		if (method_exists('ShopUrl', 'resetMainDomainCache'))
			ShopUrl::resetMainDomainCache();
		$cmss_id = Db::getInstance()->ExecuteS(
			'SELECT c.`id_cms` FROM `'._DB_PREFIX_.'cms` c INNER JOIN `'._DB_PREFIX_.'cms_lang` cl ON c.`id_cms` = cl.`id_cms` '.
			($this->tableColumnExists(_DB_PREFIX_.'supplier_shop') ? 'INNER JOIN `'._DB_PREFIX_.'cms_shop` cs ON c.`id_cms` = cs.`id_cms` ' : '').
			'INNER JOIN `'._DB_PREFIX_.'cms_category` cc ON c.id_cms_category = cc.id_cms_category AND cc.active = 1
				WHERE c.`active` =1 AND c.`indexation` =1 AND c.`id_cms` >= '.(int)$id_cms.
			($this->tableColumnExists(_DB_PREFIX_.'supplier_shop') ? ' AND cs.id_shop = '.(int)$this->context->shop->id : '').
			' AND cl.`id_lang` = '.(int)$lang['id_lang'].
			' ORDER BY c.`id_cms` ASC'
		);

		if (is_array($cmss_id))
			foreach ($cmss_id as $cms_id)
			{
				$cms = new CMS((int)$cms_id['id_cms'], $lang['id_lang']);
				$cms->link_rewrite = urlencode((is_array($cms->link_rewrite) ? $cms->link_rewrite[(int)$lang['id_lang']] : $cms->link_rewrite));
				$url = $link->getCMSLink($cms, null, null, $lang['id_lang']);

				if (!$this->_addLinkToSitemap(
					$link_sitemap, array(
						'type' => 'cms',
						'page' => 'cms',
						'link' => $url,
						'image' => false
					), $lang['iso_code'], $index, $i, $cms_id['id_cms']
				))
					return false;
			}

		return true;
	}

	/**
	 * Returns link elements generated by modules subscribes to hook gsitemap::HOOK_ADD_URLS
	 *
	 * The hook expects modules to return a vector of associative arrays each of them being acceptable by
	 *   the gsitemap::_addLinkToSitemap() second attribute (minus the 'type' index).
	 * The 'type' index is automatically set to 'module' (not sure here, should we be safe or trust modules?).
	 *
	 * @param array  $link_sitemap by ref. accumulator for all the links for the Google Sitemap file to be generated
	 * @param string $lang         the language being processed
	 * @param int    $index        the index of the current Google Sitemap file
	 * @param int    $i            the count of elements added to sitemap main array
	 * @param int    $num_link     restart at link number #$num_link
	 * @return boolean
	 */
	private function _getModuleLink(&$link_sitemap, $lang, &$index, &$i, $num_link = 0)
	{
		$modules_links = Hook::exec(self::HOOK_ADD_URLS, array('lang' => $lang), null, true);
		if (empty($modules_links) || !is_array($modules_links))
			return true;
		$links = array();
		foreach ($modules_links as $module_links)
			$links = array_merge($links, $module_links);
		foreach ($module_links as $n => $link)
		{
			if ($num_link > $n)
				continue;
			$link['type'] = 'module';
			if (!$this->_addLinkToSitemap($link_sitemap, $link, $lang['iso_code'], $index, $i, $n))
				return false;
		}
		return true;
	}

	/**
	 * Create the Google Sitemap by Shop
	 *
	 * @param int $id_shop Shop identifier
	 *
	 * @return bool
	 */
	public function createSitemap($id_shop = 0)
	{
		if (@fopen($this->normalizeDirectory(_PS_ROOT_DIR_).'/test.txt', 'w') == false)
		{
			$this->context->smarty->assign('google_maps_error', $this->l('An error occured while trying to check your file permissions. Please adjust your permissions to allow PrestaShop to write a file in your root directory.'));

			return false;
		}
		else
			@unlink($this->normalizeDirectory(_PS_ROOT_DIR_).'test.txt');

		if ($id_shop != 0)
			$this->context->shop = new Shop((int)$id_shop);

		$type = Tools::getValue('type') ? Tools::getValue('type') : '';
		$languages = Language::getLanguages(true, $id_shop);
		$lang_stop = Tools::getValue('lang') ? true : false;
		$id_obj = Tools::getValue('id') ? (int)Tools::getValue('id') : 0;
		foreach ($languages as $lang)
		{
			$i = 0;
			$index = (Tools::getValue('index') && Tools::getValue('lang') == $lang['iso_code']) ? (int)Tools::getValue('index') : 0;
			if ($lang_stop && $lang['iso_code'] != Tools::getValue('lang'))
				continue;
			elseif ($lang_stop && $lang['iso_code'] == Tools::getValue('lang'))
				$lang_stop = false;

			$link_sitemap = array();
			foreach ($this->type_array as $type_val)
			{
				if ($type == '' || $type == $type_val)
				{
					$function = '_get'.ucfirst($type_val).'Link';
					if (!$this->$function($link_sitemap, $lang, $index, $i, $id_obj))
						return false;
					$type = '';
					$id_obj = 0;
				}
			}
			$this->_recursiveSitemapCreator($link_sitemap, $lang['iso_code'], $index);
			$page = '';
			$index = 0;
		}

		$this->_createIndexSitemap();
		Configuration::updateValue('GSITEMAP_LAST_EXPORT', date('r'));
		Tools::file_get_contents('http://www.google.com/webmasters/sitemaps/ping?sitemap='.urlencode('http'.(Configuration::get('PS_SSL_ENABLED') ? 's' : '').'://'.Tools::getShopDomain(false, true).$this->context->shop->physical_uri.$this->context->shop->virtual_uri.$this->context->shop->id.'_index_sitemap.xml'));

		if ($this->cron)
			die();
		header('location: ./index.php?tab=AdminModules&configure=gsitemap&token='.Tools::getAdminTokenLite('AdminModules').'&tab_module='.$this->tab.'&module_name=gsitemap&validation');
		die();
	}

	/**
	 * Store the generated Sitemap file to the database
	 *
	 * @param string $sitemap the name of the generated Google Sitemap file
	 *
	 * @return bool
	 */
	private function _saveSitemapLink($sitemap)
	{
		if ($sitemap)
			return Db::getInstance()->Execute('INSERT INTO `'._DB_PREFIX_.'gsitemap_sitemap` (`link`, id_shop) VALUES (\''.pSQL($sitemap).'\', '.(int)$this->context->shop->id.')');

		return false;
	}

	/**
	 * @param array  $link_sitemap contain all the links for the Google Sitemap file to be generated
	 * @param string $lang         the language of link to add
	 * @param int    $index        the index of the current Google Sitemap file
	 *
	 * @return bool
	 */
	private function _recursiveSitemapCreator($link_sitemap, $lang, &$index)
	{
		if (!count($link_sitemap))
			return false;

		$sitemap_link = $this->context->shop->id.'_'.$lang.'_'.$index.'_sitemap.xml';
		$write_fd = fopen($this->normalizeDirectory(_PS_ROOT_DIR_).$sitemap_link, 'w');

		fwrite($write_fd, '<?xml version="1.0" encoding="UTF-8"?>'."\r\n".'<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">'."\r\n");
		foreach ($link_sitemap as $key => $file)
		{
			fwrite($write_fd, '<url>'."\r\n");
			$lastmod = (isset($file['lastmod']) && !empty($file['lastmod'])) ? date('c', strtotime($file['lastmod'])) : null;
			$this->_addSitemapNode($write_fd, htmlspecialchars(strip_tags($file['link'])), $this->_getPriorityPage($file['page']), Configuration::get('GSITEMAP_FREQUENCY'), $lastmod);
			if ($file['image'])
			{
				$this->_addSitemapNodeImage(
					$write_fd, htmlspecialchars(strip_tags($file['image']['link'])), isset($file['image']['title_img']) ? htmlspecialchars(
						str_replace(
							array(
								"\r\n",
								"\r",
								"\n"
							), '', strip_tags($file['image']['title_img'])
						)
					) : '', isset($file['image']['caption']) ? htmlspecialchars(
						str_replace(
							array(
								"\r\n",
								"\r",
								"\n"
							), '', strip_tags($file['image']['caption'])
						)
					) : ''
				);
			}
			fwrite($write_fd, '</url>'."\r\n");
		}
		fwrite($write_fd, '</urlset>'."\r\n");
		fclose($write_fd);
		$this->_saveSitemapLink($sitemap_link);
		$index++;

		return true;
	}

	/**
	 * return the priority value set in the configuration parameters
	 *
	 * @param string $page
	 *
	 * @return float|string|bool
	 */
	private function _getPriorityPage($page)
	{
		return Configuration::get('GSITEMAP_PRIORITY_'.Tools::strtoupper($page)) ? Configuration::get('GSITEMAP_PRIORITY_'.Tools::strtoupper($page)) : 0.1;
	}

	/**
	 * Add a new line to the sitemap file
	 *
	 * @param resource $fd       file system object resource
	 * @param string   $loc      string the URL of the object page
	 * @param string   $priority
	 * @param string   $change_freq
	 * @param int      $last_mod the last modification date/time as a timestamp
	 */
	private function _addSitemapNode($fd, $loc, $priority, $change_freq, $last_mod = null)
	{
		fwrite($fd, '<loc>'.(Configuration::get('PS_REWRITING_SETTINGS') ? '<![CDATA['.$loc.']]>' : $loc).'</loc>'."\r\n".'<priority>'."\r\n".number_format($priority, 1, '.', '').'</priority>'."\r\n".($last_mod ? '<lastmod>'.date('c', strtotime($last_mod)).'</lastmod>' : '')."\r\n".'<changefreq>'.$change_freq.'</changefreq>'."\r\n");
	}

	private function _addSitemapNodeImage($fd, $link, $title, $caption)
	{
		fwrite($fd, '<image:image>'."\r\n".'<image:loc>'.(Configuration::get('PS_REWRITING_SETTINGS') ? '<![CDATA['.$link.']]>' : $link).'</image:loc>'."\r\n".'<image:caption><![CDATA['.$caption.']]></image:caption>'."\r\n".'<image:title><![CDATA['.$title.']]></image:title>'."\r\n".'</image:image>'."\r\n");
	}

	/**
	 * Create the index file for all generated sitemaps
	 * @return boolean
	 */
	private function _createIndexSitemap()
	{
		$sitemaps = Db::getInstance()->ExecuteS('SELECT `link` FROM `'._DB_PREFIX_.'gsitemap_sitemap` WHERE id_shop = '.$this->context->shop->id);
		if (!$sitemaps)
			return false;

		$xml = '<?xml version="1.0" encoding="UTF-8"?><sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"></sitemapindex>';
		$xml_feed = new SimpleXMLElement($xml);

		foreach ($sitemaps as $link)
		{
			$sitemap = $xml_feed->addChild('sitemap');
			$sitemap->addChild('loc', 'http://'.Tools::getShopDomain(false, true).__PS_BASE_URI__.$link['link']);
			$sitemap->addChild('lastmod', date('c'));
		}
		file_put_contents($this->normalizeDirectory(_PS_ROOT_DIR_).$this->context->shop->id.'_index_sitemap.xml', $xml_feed->asXML());

		return true;
	}

	private function tableColumnExists($table_name, $column = null)
	{
		if (array_key_exists($table_name, $this->sql_checks))
			if (!empty($column) && array_key_exists($column, $this->sql_checks[$table_name]))
				return $this->sql_checks[$table_name][$column];
			else
				return $this->sql_checks[$table_name];

		$table = Db::getInstance()->ExecuteS('SHOW TABLES LIKE \''.$table_name.'\'');
		if (empty($column))
			if (count($table) < 1)
				return $this->sql_checks[$table_name] = false;
			else
				$this->sql_checks[$table_name] = true;

		else
		{
			$table = Db::getInstance()->ExecuteS('SELECT * FROM `'.$table_name.'` LIMIT 1');

			return $this->sql_checks[$table_name][$column] = array_key_exists($column, current($table));
		}

		return true;
	}

	protected function normalizeDirectory($directory)
	{
		$last = $directory[strlen($directory) - 1];

		if (in_array($last, array('/', '\\')))
		{
			$directory[strlen($directory) - 1] = DIRECTORY_SEPARATOR;
			return $directory;
		}

		$directory .= DIRECTORY_SEPARATOR;
		return $directory;
	}
}