<?php
/*
* 2007-2015 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  2007-2015 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 FreeOrder to use PaymentModule (abstract class, cannot be instancied)
 */
class FreeOrder extends PaymentModule
{
	public $active = 1;
	public $name = 'free_order';
	public $displayName = 'free_order';
}

class ParentOrderControllerCore extends FrontController
{
	public $ssl = true;
	public $php_self = 'order';

	public $nbProducts;

	/**
	 * Initialize parent order controller
	 * @see FrontController::init()
	 */
	public function init()
	{
		$this->isLogged = $this->context->customer->id && Customer::customerIdExistsStatic((int)$this->context->cookie->id_customer);

		parent::init();

		/* Disable some cache related bugs on the cart/order */
		header('Cache-Control: no-cache, must-revalidate');
		header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');

		$this->nbProducts = $this->context->cart->nbProducts();

		if (!$this->context->customer->isLogged(true) && $this->useMobileTheme() && Tools::getValue('step'))
			Tools::redirect($this->context->link->getPageLink('authentication', true, (int)$this->context->language->id));

		// Redirect to the good order process
		if (Configuration::get('PS_ORDER_PROCESS_TYPE') == 0 && Dispatcher::getInstance()->getController() != 'order')
			Tools::redirect('index.php?controller=order');

		if (Configuration::get('PS_ORDER_PROCESS_TYPE') == 1 && Dispatcher::getInstance()->getController() != 'orderopc')
		{
			if (Tools::getIsset('step') && Tools::getValue('step') == 3)
				Tools::redirect('index.php?controller=order-opc&isPaymentStep=true');
			Tools::redirect('index.php?controller=order-opc');
		}

		if (Configuration::get('PS_CATALOG_MODE'))
			$this->errors[] = Tools::displayError('This store has not accepted your new order.');

		if (Tools::isSubmit('submitReorder') && $id_order = (int)Tools::getValue('id_order'))
		{
			$oldCart = new Cart(Order::getCartIdStatic($id_order, $this->context->customer->id));
			$duplication = $oldCart->duplicate();
			if (!$duplication || !Validate::isLoadedObject($duplication['cart']))
				$this->errors[] = Tools::displayError('Sorry. We cannot renew your order.');
			elseif (!$duplication['success'])
				$this->errors[] = Tools::displayError('Some items are no longer available, and we are unable to renew your order.');
			else
			{
				$this->context->cookie->id_cart = $duplication['cart']->id;
				$context = $this->context;
				$context->cart = $duplication['cart'];
				CartRule::autoAddToCart($context);
				$this->context->cookie->write();
				if (Configuration::get('PS_ORDER_PROCESS_TYPE') == 1)
					Tools::redirect('index.php?controller=order-opc');
				Tools::redirect('index.php?controller=order');
			}
		}

		if ($this->nbProducts)
		{
			if (CartRule::isFeatureActive())
			{
				if (Tools::isSubmit('submitAddDiscount'))
				{
					if (!($code = trim(Tools::getValue('discount_name'))))
						$this->errors[] = Tools::displayError('You must enter a voucher code.');
					elseif (!Validate::isCleanHtml($code))
						$this->errors[] = Tools::displayError('The voucher code is invalid.');
					else
					{
						if (($cartRule = new CartRule(CartRule::getIdByCode($code))) && Validate::isLoadedObject($cartRule))
						{
							if ($error = $cartRule->checkValidity($this->context, false, true))
								$this->errors[] = $error;
							else
							{
								$this->context->cart->addCartRule($cartRule->id);
								if (Configuration::get('PS_ORDER_PROCESS_TYPE') == 1)
									Tools::redirect('index.php?controller=order-opc&addingCartRule=1');
								Tools::redirect('index.php?controller=order&addingCartRule=1');
							}
						}
						else
							$this->errors[] = Tools::displayError('This voucher does not exists.');
					}
					$this->context->smarty->assign(array(
						'errors' => $this->errors,
						'discount_name' => Tools::safeOutput($code)
					));
				}
				elseif (($id_cart_rule = (int)Tools::getValue('deleteDiscount')) && Validate::isUnsignedId($id_cart_rule))
				{
					$this->context->cart->removeCartRule($id_cart_rule);
					Tools::redirect('index.php?controller=order-opc');
				}
			}
			/* Is there only virtual product in cart */
			if ($isVirtualCart = $this->context->cart->isVirtualCart())
				$this->setNoCarrier();
		}

		$this->context->smarty->assign('back', Tools::safeOutput(Tools::getValue('back')));
	}

	public function setMedia()
	{
		parent::setMedia();

		if (!$this->useMobileTheme())
			// Adding CSS style sheet
			$this->addCSS(_THEME_CSS_DIR_.'addresses.css');

		// Adding JS files
		$this->addJS(_THEME_JS_DIR_.'tools.js');  // retro compat themes 1.5
		if ((Configuration::get('PS_ORDER_PROCESS_TYPE') == 0 && Tools::getValue('step') == 1) || Configuration::get('PS_ORDER_PROCESS_TYPE') == 1)
			$this->addJS(_THEME_JS_DIR_.'order-address.js');
		$this->addJqueryPlugin('fancybox');

		if (in_array((int)Tools::getValue('step'), array(0, 2, 3)) || Configuration::get('PS_ORDER_PROCESS_TYPE'))
		{
			$this->addJqueryPlugin('typewatch');
			$this->addJS(_THEME_JS_DIR_.'cart-summary.js');
		}
	}

	/**
	 * Check if order is free
	 * @return bool
	 */
	protected function _checkFreeOrder()
	{
		if ($this->context->cart->getOrderTotal() <= 0)
		{
			$order = new FreeOrder();
			$order->free_order_class = true;
			$order->validateOrder($this->context->cart->id, Configuration::get('PS_OS_PAYMENT'), 0, Tools::displayError('Free order', false), null, array(), null, false, $this->context->cart->secure_key);
			return (int)Order::getOrderByCartId($this->context->cart->id);
		}
		return false;
	}

	protected function _updateMessage($messageContent)
	{
		if ($messageContent)
		{
			if (!Validate::isMessage($messageContent))
				$this->errors[] = Tools::displayError('Invalid message');
			elseif ($oldMessage = Message::getMessageByCartId((int)$this->context->cart->id))
			{
				$message = new Message((int)$oldMessage['id_message']);
				$message->message = $messageContent;
				$message->update();
			}
			else
			{
				$message = new Message();
				$message->message = $messageContent;
				$message->id_cart = (int)$this->context->cart->id;
				$message->id_customer = (int)$this->context->cart->id_customer;
				$message->add();
			}
		}
		else
		{
			if ($oldMessage = Message::getMessageByCartId($this->context->cart->id))
			{
				$message = new Message($oldMessage['id_message']);
				$message->delete();
			}
		}
		return true;
	}

	protected function _processCarrier()
	{
		$this->context->cart->recyclable = (int)Tools::getValue('recyclable');
		$this->context->cart->gift = (int)Tools::getValue('gift');
		if ((int)Tools::getValue('gift'))
		{
			if (!Validate::isMessage(Tools::getValue('gift_message')))
				$this->errors[] = Tools::displayError('Invalid gift message.');
			else
				$this->context->cart->gift_message = strip_tags(Tools::getValue('gift_message'));
		}

		if (isset($this->context->customer->id) && $this->context->customer->id)
		{
			$address = new Address((int)$this->context->cart->id_address_delivery);
			if (!($id_zone = Address::getZoneById($address->id)))
				$this->errors[] = Tools::displayError('No zone matches your address.');
		}
		else
			$id_zone = Country::getIdZone((int)Tools::getCountry());

		if (Tools::getIsset('delivery_option'))
		{
			if ($this->validateDeliveryOption(Tools::getValue('delivery_option')))
				$this->context->cart->setDeliveryOption(Tools::getValue('delivery_option'));
		}
		elseif (Tools::getIsset('id_carrier'))
		{
			// For retrocompatibility reason, try to transform carrier to an delivery option list
			$delivery_option_list = $this->context->cart->getDeliveryOptionList();
			if (count($delivery_option_list) == 1)
			{
				$delivery_option = reset($delivery_option_list);
				$key = Cart::desintifier(Tools::getValue('id_carrier'));
				foreach ($delivery_option_list as $id_address => $options)
					if (isset($options[$key]))
					{
						$this->context->cart->id_carrier = (int)Tools::getValue('id_carrier');
						$this->context->cart->setDeliveryOption(array($id_address => $key));
						if (isset($this->context->cookie->id_country))
							unset($this->context->cookie->id_country);
						if (isset($this->context->cookie->id_state))
							unset($this->context->cookie->id_state);

					}
			}
		}

		Hook::exec('actionCarrierProcess', array('cart' => $this->context->cart));

		if (!$this->context->cart->update())
			return false;

		// Carrier has changed, so we check if the cart rules still apply
		CartRule::autoRemoveFromCart($this->context);
		CartRule::autoAddToCart($this->context);

		return true;
	}

	/**
	 * Validate get/post param delivery option
	 *
	 * @param array $delivery_option
	 *
	 * @return bool
	 */
	protected function validateDeliveryOption($delivery_option)
	{
		if (!is_array($delivery_option))
			return false;

		foreach ($delivery_option as $option)
			if (!preg_match('/(\d+,)?\d+/', $option))
				return false;

		return true;
	}

	protected function _assignSummaryInformations()
	{
		$summary = $this->context->cart->getSummaryDetails();
		$customizedDatas = Product::getAllCustomizedDatas($this->context->cart->id);

		// override customization tax rate with real tax (tax rules)
		if ($customizedDatas)
		{
			foreach ($summary['products'] as &$productUpdate)
			{
				$productId = (int)isset($productUpdate['id_product']) ? $productUpdate['id_product'] : $productUpdate['product_id'];
				$productAttributeId = (int)isset($productUpdate['id_product_attribute']) ? $productUpdate['id_product_attribute'] : $productUpdate['product_attribute_id'];

				if (isset($customizedDatas[$productId][$productAttributeId]))
					$productUpdate['tax_rate'] = Tax::getProductTaxRate($productId, $this->context->cart->{Configuration::get('PS_TAX_ADDRESS_TYPE')});
			}

			Product::addCustomizationPrice($summary['products'], $customizedDatas);
		}

		$cart_product_context = Context::getContext()->cloneContext();
		foreach ($summary['products'] as $key => &$product)
		{
			$product['quantity'] = $product['cart_quantity'];// for compatibility with 1.2 themes

			if ($cart_product_context->shop->id != $product['id_shop'])
				$cart_product_context->shop = new Shop((int)$product['id_shop']);
			$product['price_without_specific_price'] = Product::getPriceStatic(
				$product['id_product'],
				!Product::getTaxCalculationMethod(),
				$product['id_product_attribute'],
				6,
				null,
				false,
				false,
				1,
				false,
				null,
				null,
				null,
				$null,
				true,
				true,
				$cart_product_context);

			if (Product::getTaxCalculationMethod())
				$product['is_discounted'] = Tools::ps_round($product['price_without_specific_price'], _PS_PRICE_COMPUTE_PRECISION_) != Tools::ps_round($product['price'], _PS_PRICE_COMPUTE_PRECISION_);
			else
				$product['is_discounted'] = Tools::ps_round($product['price_without_specific_price'], _PS_PRICE_COMPUTE_PRECISION_) != Tools::ps_round($product['price_wt'], _PS_PRICE_COMPUTE_PRECISION_);
		}

		// Get available cart rules and unset the cart rules already in the cart
		$available_cart_rules = CartRule::getCustomerCartRules($this->context->language->id, (isset($this->context->customer->id) ? $this->context->customer->id : 0), true, true, true, $this->context->cart, false, true);
		$cart_cart_rules = $this->context->cart->getCartRules();
		foreach ($available_cart_rules as $key => $available_cart_rule)
		{
			foreach ($cart_cart_rules as $cart_cart_rule)
				if ($available_cart_rule['id_cart_rule'] == $cart_cart_rule['id_cart_rule'])
				{
					unset($available_cart_rules[$key]);
					continue 2;
				}
		}

		$show_option_allow_separate_package = (!$this->context->cart->isAllProductsInStock(true) && Configuration::get('PS_SHIP_WHEN_AVAILABLE'));
		$advanced_payment_api = (bool)Configuration::get('PS_ADVANCED_PAYMENT_API');

		$this->context->smarty->assign($summary);
		$this->context->smarty->assign(array(
			'token_cart' => Tools::getToken(false),
			'isLogged' => $this->isLogged,
			'isVirtualCart' => $this->context->cart->isVirtualCart(),
			'productNumber' => $this->context->cart->nbProducts(),
			'voucherAllowed' => CartRule::isFeatureActive(),
			'shippingCost' => $this->context->cart->getOrderTotal(true, Cart::ONLY_SHIPPING),
			'shippingCostTaxExc' => $this->context->cart->getOrderTotal(false, Cart::ONLY_SHIPPING),
			'customizedDatas' => $customizedDatas,
			'CUSTOMIZE_FILE' => Product::CUSTOMIZE_FILE,
			'CUSTOMIZE_TEXTFIELD' => Product::CUSTOMIZE_TEXTFIELD,
			'lastProductAdded' => $this->context->cart->getLastProduct(),
			'displayVouchers' => $available_cart_rules,
			'show_option_allow_separate_package' => $show_option_allow_separate_package,
			'smallSize' => Image::getSize(ImageType::getFormatedName('small')),
			'advanced_payment_api' => $advanced_payment_api

		));

		$this->context->smarty->assign(array(
			'HOOK_SHOPPING_CART' => Hook::exec('displayShoppingCartFooter', $summary),
			'HOOK_SHOPPING_CART_EXTRA' => Hook::exec('displayShoppingCart', $summary)
		));
	}

	protected function _assignAddress()
	{
		//if guest checkout disabled and flag is_guest  in cookies is actived
		if (Configuration::get('PS_GUEST_CHECKOUT_ENABLED') == 0 && ((int)$this->context->customer->is_guest != Configuration::get('PS_GUEST_CHECKOUT_ENABLED')))
		{
			$this->context->customer->logout();
			Tools::redirect('');
		}
		elseif (!Customer::getAddressesTotalById($this->context->customer->id))
		{
			$multi = (int)Tools::getValue('multi-shipping');
			Tools::redirect('index.php?controller=address&back='.urlencode('order.php?step=1'.($multi ? '&multi-shipping='.$multi : '')));
		}

		$customer = $this->context->customer;
		if (Validate::isLoadedObject($customer))
		{
			/* Getting customer addresses */
			$customerAddresses = $customer->getAddresses($this->context->language->id);

			// Getting a list of formated address fields with associated values
			$formatedAddressFieldsValuesList = array();

			foreach ($customerAddresses as $i => $address)
			{
				if (!Address::isCountryActiveById((int)$address['id_address']))
					unset($customerAddresses[$i]);
				$tmpAddress = new Address($address['id_address']);
				$formatedAddressFieldsValuesList[$address['id_address']]['ordered_fields'] = AddressFormat::getOrderedAddressFields($address['id_country']);
				$formatedAddressFieldsValuesList[$address['id_address']]['formated_fields_values'] = AddressFormat::getFormattedAddressFieldsValues(
					$tmpAddress,
					$formatedAddressFieldsValuesList[$address['id_address']]['ordered_fields']);

				unset($tmpAddress);
			}

			$customerAddresses = array_values($customerAddresses);

			if (!count($customerAddresses) && !Tools::isSubmit('ajax'))
			{
				$bad_delivery = false;
				if (($bad_delivery = (bool)!Address::isCountryActiveById((int)$this->context->cart->id_address_delivery)) || !Address::isCountryActiveById((int)$this->context->cart->id_address_invoice))
				{
					$params = array();
					if ($this->step)
						$params['step'] = (int)$this->step;
					if ($multi = (int)Tools::getValue('multi-shipping'))
						$params['multi-shipping'] = $multi;
					$back_url = $this->context->link->getPageLink('order', true, (int)$this->context->language->id, $params);

					$params = array('back' => $back_url, 'id_address' => ($bad_delivery ? (int)$this->context->cart->id_address_delivery : (int)$this->context->cart->id_address_invoice));
					if ($multi)
						$params['multi-shipping'] = $multi;

					Tools::redirect($this->context->link->getPageLink('address', true, (int)$this->context->language->id, $params));
				}
			}
			$this->context->smarty->assign(array(
				'addresses' => $customerAddresses,
				'formatedAddressFieldsValuesList' => $formatedAddressFieldsValuesList)
			);

			/* Setting default addresses for cart */
			if (count($customerAddresses))
			{
				if ((!isset($this->context->cart->id_address_delivery) || empty($this->context->cart->id_address_delivery)) || !Address::isCountryActiveById((int)$this->context->cart->id_address_delivery))
				{
					$this->context->cart->id_address_delivery = (int)$customerAddresses[0]['id_address'];
					$update = 1;
				}
				if ((!isset($this->context->cart->id_address_invoice) || empty($this->context->cart->id_address_invoice)) || !Address::isCountryActiveById((int)$this->context->cart->id_address_invoice))
				{
					$this->context->cart->id_address_invoice = (int)$customerAddresses[0]['id_address'];
					$update = 1;
				}

				/* Update cart addresses only if needed */
				if (isset($update) && $update)
				{
					$this->context->cart->update();
					if (!$this->context->cart->isMultiAddressDelivery())
						$this->context->cart->setNoMultishipping();
					// Address has changed, so we check if the cart rules still apply
					CartRule::autoRemoveFromCart($this->context);
					CartRule::autoAddToCart($this->context);
				}
			}

			/* If delivery address is valid in cart, assign it to Smarty */
			if (isset($this->context->cart->id_address_delivery))
			{
				$deliveryAddress = new Address((int)$this->context->cart->id_address_delivery);
				if (Validate::isLoadedObject($deliveryAddress) && ($deliveryAddress->id_customer == $customer->id))
					$this->context->smarty->assign('delivery', $deliveryAddress);
			}

			/* If invoice address is valid in cart, assign it to Smarty */
			if (isset($this->context->cart->id_address_invoice))
			{
				$invoiceAddress = new Address((int)$this->context->cart->id_address_invoice);
				if (Validate::isLoadedObject($invoiceAddress) && ($invoiceAddress->id_customer == $customer->id))
					$this->context->smarty->assign('invoice', $invoiceAddress);
			}
		}
		if ($oldMessage = Message::getMessageByCartId((int)$this->context->cart->id))
			$this->context->smarty->assign('oldMessage', $oldMessage['message']);
	}

	protected function _assignCarrier()
	{
		$address = new Address($this->context->cart->id_address_delivery);
		$id_zone = Address::getZoneById($address->id);
		$carriers = $this->context->cart->simulateCarriersOutput(null, true);
		$checked = $this->context->cart->simulateCarrierSelectedOutput(false);
		$delivery_option_list = $this->context->cart->getDeliveryOptionList();
		$delivery_option = $this->context->cart->getDeliveryOption(null, false);
		$this->setDefaultCarrierSelection($delivery_option_list);

		$this->context->smarty->assign(array(
			'address_collection' => $this->context->cart->getAddressCollection(),
			'delivery_option_list' => $delivery_option_list,
			'carriers' => $carriers,
			'checked' => $checked,
			'delivery_option' => $delivery_option
		));

		$advanced_payment_api = (bool)Configuration::get('PS_ADVANCED_PAYMENT_API');

		$vars = array(
			'HOOK_BEFORECARRIER' => Hook::exec('displayBeforeCarrier', array(
				'carriers' => $carriers,
				'checked' => $checked,
				'delivery_option_list' => $delivery_option_list,
				'delivery_option' => $delivery_option
			)),
			'advanced_payment_api' => $advanced_payment_api
		);

		Cart::addExtraCarriers($vars);

		$this->context->smarty->assign($vars);
	}

	protected function _assignWrappingAndTOS()
	{
		// Wrapping fees
		$wrapping_fees = $this->context->cart->getGiftWrappingPrice(false);
		$wrapping_fees_tax_inc = $this->context->cart->getGiftWrappingPrice();

		// TOS
		$cms = new CMS(Configuration::get('PS_CONDITIONS_CMS_ID'), $this->context->language->id);
		$this->link_conditions = $this->context->link->getCMSLink($cms, $cms->link_rewrite, (bool)Configuration::get('PS_SSL_ENABLED'));
		if (!strpos($this->link_conditions, '?'))
			$this->link_conditions .= '?content_only=1';
		else
			$this->link_conditions .= '&content_only=1';

		$free_shipping = false;
		foreach ($this->context->cart->getCartRules() as $rule)
		{
			if ($rule['free_shipping'] && !$rule['carrier_restriction'])
			{
				$free_shipping = true;
				break;
			}
		}
		$this->context->smarty->assign(array(
			'free_shipping' => $free_shipping,
			'checkedTOS' => (int)$this->context->cookie->checkedTOS,
			'recyclablePackAllowed' => (int)Configuration::get('PS_RECYCLABLE_PACK'),
			'giftAllowed' => (int)Configuration::get('PS_GIFT_WRAPPING'),
			'cms_id' => (int)Configuration::get('PS_CONDITIONS_CMS_ID'),
			'conditions' => (int)Configuration::get('PS_CONDITIONS'),
			'link_conditions' => $this->link_conditions,
			'recyclable' => (int)$this->context->cart->recyclable,
			'delivery_option_list' => $this->context->cart->getDeliveryOptionList(),
			'carriers' => $this->context->cart->simulateCarriersOutput(),
			'checked' => $this->context->cart->simulateCarrierSelectedOutput(),
			'address_collection' => $this->context->cart->getAddressCollection(),
			'delivery_option' => $this->context->cart->getDeliveryOption(null, false),
			'gift_wrapping_price' => (float)$wrapping_fees,
			'total_wrapping_cost' => Tools::convertPrice($wrapping_fees_tax_inc, $this->context->currency),
			'override_tos_display' => Hook::exec('overrideTOSDisplay'),
			'total_wrapping_tax_exc_cost' => Tools::convertPrice($wrapping_fees, $this->context->currency)));
	}

	protected function _assignPayment()
	{

		if ((bool)Configuration::get('PS_ADVANCED_PAYMENT_API'))
		{
			$this->addJS(_THEME_JS_DIR_.'advanced-payment-api.js');

			// TOS
			$cms = new CMS(Configuration::get('PS_CONDITIONS_CMS_ID'), $this->context->language->id);
			$this->link_conditions = $this->context->link->getCMSLink($cms, $cms->link_rewrite, (bool)Configuration::get('PS_SSL_ENABLED'));
			if (!strpos($this->link_conditions, '?'))
				$this->link_conditions .= '?content_only=1';
			else
				$this->link_conditions .= '&content_only=1';

			$this->context->smarty->assign(array(
				'HOOK_TOP_PAYMENT' => Hook::exec('displayPaymentTop'),
				'HOOK_ADVANCED_PAYMENT' => Hook::exec('advancedPaymentOptions', array(), null, true),
				'link_conditions' => $this->link_conditions
			));
		}
		else
			$this->context->smarty->assign(array(
				'HOOK_TOP_PAYMENT' => Hook::exec('displayPaymentTop'),
				'HOOK_PAYMENT' => Hook::exec('displayPayment'),
			));
	}

	/**
	 * Set id_carrier to 0 (no shipping price)
	 */
	protected function setNoCarrier()
	{
		$this->context->cart->setDeliveryOption(null);
		$this->context->cart->update();
	}

	/**
	 * Decides what the default carrier is and update the cart with it
	 *
	 * @todo this function must be modified - id_carrier is now delivery_option
	 *
	 * @param array $carriers
	 *
	 * @deprecated since 1.5.0
	 *
	 * @return number the id of the default carrier
	 */
	protected function setDefaultCarrierSelection($carriers)
	{
		if (!$this->context->cart->getDeliveryOption(null, true))
			$this->context->cart->setDeliveryOption($this->context->cart->getDeliveryOption());
	}

	/**
	 * Decides what the default carrier is and update the cart with it
	 *
	 * @param array $carriers
	 *
	 * @deprecated since 1.5.0
	 *
	 * @return number the id of the default carrier
	 */
	protected function _setDefaultCarrierSelection($carriers)
	{
		$this->context->cart->id_carrier = Carrier::getDefaultCarrierSelection($carriers, (int)$this->context->cart->id_carrier);

		if ($this->context->cart->update())
			return $this->context->cart->id_carrier;
		return 0;
	}

}
