<?php
/*
* 2007-2012 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  2007-2012 PrestaShop SA
*  @version  Release: $Revision: 7307 $
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

/**
 * @since 1.5.0
 */
class AdminStockManagementControllerCore extends AdminController
{
	public function __construct()
	{
		$this->context = Context::getContext();
		$this->table = 'product';
		$this->className = 'Product';
		$this->lang = true;
		$this->multishop_context = Shop::CONTEXT_ALL;

		$this->fieldsDisplay = array(
			'reference' => array(
				'title' => $this->l('Product reference'),
				'align' => 'center',
				'filter_key' => 'a!reference',
				'width' => 200
			),
			'ean13' => array(
				'title' => $this->l('EAN13'),
				'align' => 'center',
				'filter_key' => 'a!ean13',
				'width' => 100
			),
			'upc' => array(
				'title' => $this->l('UPC'),
				'align' => 'center',
				'filter_key' => 'a!upc',
				'width' => 100
			),
			'name' => array(
				'title' => $this->l('Name'),
			),
			'stock' => array(
				'title' => $this->l('Quantity'),
				'hint' => $this->l('Sum of quantities for all warehouses'),
				'width' => 100,
				'orderby' => false,
				'filter' => false,
				'search' => false,
			),
		);

		parent::__construct();

		// overrides confirmation messages specifically for this controller
		$this->_conf = array(
			1 => $this->l('The product was successfully added to stock'),
			2 => $this->l('The product was successfully removed from the stock'),
			3 => $this->l('The transfer was successfully done'),
		);
	}

	/**
	 * AdminController::renderList() override
	 * @see AdminController::renderList()
	 */
	public function renderList()
	{
		// sets actions
		$this->addRowAction('details');
		$this->addRowAction('addstock');
		$this->addRowAction('removestock');
		$this->addRowAction('transferstock');

		// no link on list rows
		$this->list_no_link = true;

		// inits toolbar
		$this->toolbar_btn = array();

		// overrides query
		$this->_select = 'a.id_product as id, COUNT(pa.id_product_attribute) as variations';
		$this->_join = 'LEFT JOIN `'._DB_PREFIX_.'product_attribute` pa ON (pa.id_product = a.id_product)';
		$this->_where = 'AND a.cache_is_pack = 0 AND a.is_virtual = 0';
		$this->_group = 'GROUP BY a.id_product';

		// displays informations
		$this->displayInformation($this->l('This interface allows you to manage the stocks of each of your products and their variations.').'<br />');
		$this->displayInformation($this->l('Through this interface, you can increase quantities (add) and decrease quantities (delete) of products for a given warehouse.'));
		$this->displayInformation($this->l('Furthermore, you can move quantities (transfer) of products between warehouses, or within one warehouse.').'<br />');
		$this->displayInformation($this->l('Note that if you want to increase quantities of multiple products at once, you can use the supply orders tab.').'<br />');

		$this->displayInformation($this->l('Finally, you will be asked to specify the state of the quantity you will add : '));
		$this->displayInformation($this->l('usable for sale means that this quantity will be available in shop(s),'));
		$this->displayInformation($this->l('otherwise it will be considered reserved (i.e. for other purposes).'));

		return parent::renderList();
	}

	/**
	 * AdminController::renderForm() override
	 * @see AdminController::renderForm()
	 */
	public function renderForm()
	{
		// gets the product
		$id_product = (int)Tools::getValue('id_product');
		$id_product_attribute = (int)Tools::getValue('id_product_attribute');

		// gets warehouses
		$warehouses_add = Warehouse::getWarehouses(true);
		$warehouses_remove = Warehouse::getWarehousesByProductId($id_product, $id_product_attribute);

		// displays warning if no warehouses
		if (!$warehouses_add)
			$this->displayWarning($this->l('You have to have Warehouses before adding stock. See Stock/Warehouses'));

		// gets the currencies
		$currencies = Currency::getCurrencies();

		// switch, in order to display the form corresponding to the current action
		switch ($this->display)
		{
			case 'addstock' :
				// gets the last stock mvt for this product, so we can display the last unit price te and the last quantity added
				$last_sm_unit_price_te = $this->l('N/A');
				$last_sm_quantity = 0;
				$last_sm_quantity_is_usable = -1;
				$last_sm = StockMvt::getLastPositiveStockMvt($id_product, $id_product_attribute);
				if ($last_sm != false)
				{
					$last_sm_currency = new Currency((int)$last_sm['id_currency']);
					$last_sm_quantity = (int)$last_sm['physical_quantity'];
					$last_sm_quantity_is_usable = (int)$last_sm['is_usable'];
					if (Validate::isLoadedObject($last_sm_currency))
						$last_sm_unit_price_te = Tools::displayPrice((float)$last_sm['price_te'], $last_sm_currency);
				}

				$this->displayInformation($this->l('Note that rolling over the quantity and price fields will give you the details of the last stock movement.'));

				// fields in the form
				$this->fields_form[]['form'] = array(
					'legend' => array(
						'title' => $this->l('Add product to stock'),
						'image' => '../img/admin/add_stock.png'
					),
					'input' => array(
						array(
							'type' => 'hidden',
							'name' => 'is_post',
						),
						array(
							'type' => 'hidden',
							'name' => 'id_product',
						),
						array(
							'type' => 'hidden',
							'name' => 'id_product_attribute',
						),
						array(
							'type' => 'hidden',
							'name' => 'check',
						),
						array(
							'type' => 'text',
							'label' => $this->l('Product reference:'),
							'name' => 'reference',
							'size' => 30,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('EAN13:'),
							'name' => 'ean13',
							'size' => 15,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('UPC:'),
							'name' => 'upc',
							'size' => 15,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('Name :'),
							'name' => 'name',
							'size' => 75,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('Quantity to add:'),
							'name' => 'quantity',
							'size' => 10,
							'maxlength' => 6,
							'required' => true,
							'desc' => $this->l('Physical quantity to add'),
							'hint' => sprintf(
										$this->l('Last physical quantity added : %s (%s)'),
										($last_sm_quantity > 0 ? $last_sm_quantity : $this->l('N/A')),
										($last_sm_quantity > 0 ? ($last_sm_quantity_is_usable >= 0 ? $this->l('usable') : $this->l('not usable')) : $this->l('N/A'))),
						),
						array(
							'type' => 'radio',
							'label' => $this->l('Usable for sale?:'),
							'name' => 'usable',
							'required' => true,
							'class' => 't',
							'is_bool' => true,
							'values' => array(
								array(
									'id' => 'active_on',
									'value' => 1,
									'label' => $this->l('Enabled')
								),
								array(
									'id' => 'active_off',
									'value' => 0,
									'label' => $this->l('Disabled')
								)
							),
							'desc' => $this->l('Is this quantity usable for sale on shops, or reserved in the warehouse for other purposes?')
						),
						array(
							'type' => 'select',
							'label' => $this->l('Warehouse:'),
							'name' => 'id_warehouse',
							'required' => true,
							'options' => array(
								'query' => $warehouses_add,
								'id' => 'id_warehouse',
								'name' => 'name'
							),
							'desc' => $this->l('Select the warehouse where you want to add the product into')
						),
						array(
							'type' => 'text',
							'label' => $this->l('Unit price (TE):'),
							'name' => 'price',
							'required' => true,
							'size' => 10,
							'maxlength' => 10,
							'desc' => $this->l('Unit purchase price or unit manufacturing cost for this product, tax excluded'),
							'hint' => sprintf($this->l('Last unit price (te) : %s'), $last_sm_unit_price_te),
						),
						array(
							'type' => 'select',
							'label' => $this->l('Currency:'),
							'name' => 'id_currency',
							'required' => true,
							'options' => array(
								'query' => $currencies,
								'id' => 'id_currency',
								'name' => 'name'
							),
							'desc' => $this->l('The currency associated to the product unit price'),
						),
						array(
							'type' => 'select',
							'label' => $this->l('Label :'),
							'name' => 'id_stock_mvt_reason',
							'required' => true,
							'options' => array(
								'query' => StockMvtReason::getStockMvtReasonsWithFilter($this->context->language->id,
																					    array(Configuration::get('PS_STOCK_MVT_TRANSFER_TO')),
																					    1),
								'id' => 'id_stock_mvt_reason',
								'name' => 'name'
							),
							'desc' => $this->l('Label used in stock movements'),
						),
					),
					'submit' => array(
						'title' => $this->l('   Add to stock   '),
						'class' => 'button'
					)
				);
				$this->fields_value['usable'] = 1;
			break;

			case 'removestock' :
				$this->fields_form[]['form'] = array(
					'legend' => array(
						'title' => $this->l('Remove product from stock'),
						'image' => '../img/admin/remove_stock.png'
					),
					'input' => array(
						array(
							'type' => 'hidden',
							'name' => 'is_post',
						),
						array(
							'type' => 'hidden',
							'name' => 'id_product',
						),
						array(
							'type' => 'hidden',
							'name' => 'id_product_attribute',
						),
						array(
							'type' => 'hidden',
							'name' => 'check',
						),
						array(
							'type' => 'text',
							'label' => $this->l('Product reference:'),
							'name' => 'reference',
							'size' => 30,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('EAN13:'),
							'name' => 'ean13',
							'size' => 15,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('Name :'),
							'name' => 'name',
							'size' => 75,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('Quantity to remove:'),
							'name' => 'quantity',
							'size' => 10,
							'maxlength' => 6,
							'required' => true,
							'desc' => $this->l('Physical quantity to remove')
						),
						array(
							'type' => 'radio',
							'label' => $this->l('Usable for sale:'),
							'name' => 'usable',
							'required' => true,
							'class' => 't',
							'is_bool' => true,
							'values' => array(
								array(
									'id' => 'active_on',
									'value' => 1,
									'label' => $this->l('Enabled')
								),
								array(
									'id' => 'active_off',
									'value' => 0,
									'label' => $this->l('Disabled')
								)
							),
							'desc' => $this->l('Do you want to remove this quantity from the usable quantity(yes) or the physical quantity(no)?')
						),
						array(
							'type' => 'select',
							'label' => $this->l('Warehouse:'),
							'name' => 'id_warehouse',
							'required' => true,
							'options' => array(
								'query' => $warehouses_remove,
								'id' => 'id_warehouse',
								'name' => 'name'
							),
							'desc' => $this->l('Select the warehouse from where you want to remove the product')
						),
						array(
							'type' => 'select',
							'label' => $this->l('Label :'),
							'name' => 'id_stock_mvt_reason',
							'required' => true,
							'options' => array(
								'query' => StockMvtReason::getStockMvtReasonsWithFilter($this->context->language->id,
																					    array(Configuration::get('PS_STOCK_MVT_TRANSFER_FROM')),
																					    -1),
								'id' => 'id_stock_mvt_reason',
								'name' => 'name'
							),
							'desc' => $this->l('Label used in stock movements'),
						),
					),
					'submit' => array(
						'title' => $this->l('   Remove from stock   '),
						'class' => 'button'
					)
				);
			break;

			case 'transferstock' :
				$this->fields_form[]['form'] = array(
					'legend' => array(
						'title' => $this->l('Transfert product from warehouse to another'),
						'image' => '../img/admin/transfer_stock.png'
					),
					'input' => array(
						array(
							'type' => 'hidden',
							'name' => 'is_post',
						),
						array(
							'type' => 'hidden',
							'name' => 'id_product',
						),
						array(
							'type' => 'hidden',
							'name' => 'id_product_attribute',
						),
						array(
							'type' => 'hidden',
							'name' => 'check',
						),
						array(
							'type' => 'text',
							'label' => $this->l('Product reference:'),
							'name' => 'reference',
							'size' => 30,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('EAN13:'),
							'name' => 'ean13',
							'size' => 15,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('Name :'),
							'name' => 'name',
							'size' => 75,
							'disabled' => true,
						),
						array(
							'type' => 'text',
							'label' => $this->l('Quantity to transfer:'),
							'name' => 'quantity',
							'size' => 10,
							'maxlength' => 6,
							'required' => true,
							'desc' => $this->l('Physical quantity to transfer.')
						),
						array(
							'type' => 'select',
							'label' => $this->l('Source Warehouse:'),
							'name' => 'id_warehouse_from',
							'required' => true,
							'options' => array(
								'query' => $warehouses_remove,
								'id' => 'id_warehouse',
								'name' => 'name'
							),
							'desc' => $this->l('Select the warehouse want to transfer the product from.')
						),
						array(
							'type' => 'radio',
							'label' => $this->l('Usable for sale in source warehouse ?'),
							'name' => 'usable_from',
							'required' => true,
							'class' => 't',
							'is_bool' => true,
							'values' => array(
								array(
									'id' => 'active_on',
									'value' => 1,
									'label' => $this->l('Enabled')
								),
								array(
									'id' => 'active_off',
									'value' => 0,
									'label' => $this->l('Disabled')
								)
							),
							'desc' => $this->l('Is this a usable quantity for sale?')
						),
						array(
							'type' => 'select',
							'label' => $this->l('Destination Warehouse:'),
							'name' => 'id_warehouse_to',
							'required' => true,
							'options' => array(
								'query' => $warehouses_add,
								'id' => 'id_warehouse',
								'name' => 'name'
							),
							'desc' => $this->l('Select the warehouse to transfer the product to.')
						),
						array(
							'type' => 'radio',
							'label' => $this->l('Usable for sale in destination warehouse ?'),
							'name' => 'usable_to',
							'required' => true,
							'class' => 't',
							'is_bool' => true,
							'values' => array(
								array(
									'id' => 'active_on',
									'value' => 1,
									'label' => $this->l('Enabled')
								),
								array(
									'id' => 'active_off',
									'value' => 0,
									'label' => $this->l('Disabled')
								)
							),
							'desc' => $this->l('Do you want it to be usable for sale?')
						),
					),
					'submit' => array(
						'title' => $this->l('   Transfer   '),
						'class' => 'button'
					)
				);
			break;
		}

		$this->initToolbar();
	}

	/**
	 * AdminController::postProcess() override
	 * @see AdminController::postProcess()
	 */
	public function postProcess()
	{
		parent::postProcess();

		// Checks access
		if (Tools::isSubmit('addStock') && !($this->tabAccess['add'] === '1'))
			$this->errors[] = Tools::displayError('You do not have the required permission to add stock.');
		if (Tools::isSubmit('removeStock') && !($this->tabAccess['delete'] === '1'))
			$this->errors[] = Tools::displayError('You do not have the required permission to delete stock.');
		if (Tools::isSubmit('transferStock') && !($this->tabAccess['edit'] === '1'))
			$this->errors[] = Tools::displayError('You do not have the required permission to transfer stock.');

		if (count($this->errors))
			return;

		// Global checks when add / remove / transfer product
		if ((Tools::isSubmit('addstock') || Tools::isSubmit('removestock') || Tools::isSubmit('transferstock') ) && Tools::isSubmit('is_post'))
		{
			// get product ID
			$id_product = (int)Tools::getValue('id_product', 0);
			if ($id_product <= 0)
				$this->errors[] = Tools::displayError('The selected product is not valid.');

			// get product_attribute ID
			$id_product_attribute = (int)Tools::getValue('id_product_attribute', 0);

			// check the product hash
			$check = Tools::getValue('check', '');
			$check_valid = md5(_COOKIE_KEY_.$id_product.$id_product_attribute);
			if ($check != $check_valid)
				$this->errors[] = Tools::displayError('The selected product is not valid.');

			// get quantity and check that the post value is really an integer
			// If it's not, we have to do nothing.
			$quantity = Tools::getValue('quantity', 0);
			if (!is_numeric($quantity) || (int)$quantity <= 0)
				$this->errors[] = Tools::displayError('The quantity value is not valid.');
			$quantity = (int)$quantity;

			$token = Tools::getValue('token') ? Tools::getValue('token') : $this->token;
			$redirect = self::$currentIndex.'&token='.$token;
		}

		// Global checks when add / remove product
		if ((Tools::isSubmit('addstock') || Tools::isSubmit('removestock') ) && Tools::isSubmit('is_post'))
		{
			// get warehouse id
			$id_warehouse = (int)Tools::getValue('id_warehouse', 0);
			if ($id_warehouse <= 0 || !Warehouse::exists($id_warehouse))
				$this->errors[] = Tools::displayError('The selected warehouse is not valid.');

			// get stock movement reason id
			$id_stock_mvt_reason = (int)Tools::getValue('id_stock_mvt_reason', 0);
			if ($id_stock_mvt_reason <= 0 || !StockMvtReason::exists($id_stock_mvt_reason))
				$this->errors[] = Tools::displayError('The reason is not valid.');

			// get usable flag
			$usable = Tools::getValue('usable', null);
			if (is_null($usable))
				$this->errors[] = Tools::displayError('You have to specify if the product quantity is usable for sale on shops.');
			$usable = (bool)$usable;
		}

		if (Tools::isSubmit('addstock') && Tools::isSubmit('is_post'))
		{
			// get product unit price
			$price = str_replace(',', '.', Tools::getValue('price', 0));
			if (!is_numeric($price))
				$this->errors[] = Tools::displayError('The product price is not valid.');
			$price = round(floatval($price), 6);

			// get product unit price currency id
			$id_currency = (int)Tools::getValue('id_currency', 0);
			if ($id_currency <= 0 || ( !($result = Currency::getCurrency($id_currency)) || empty($result) ))
				$this->errors[] = Tools::displayError('The selected currency is not valid.');

			// if all is ok, add stock
			if (count($this->errors) == 0)
			{
				$warehouse = new Warehouse($id_warehouse);

				// convert price to warehouse currency if needed
				if ($id_currency != $warehouse->id_currency)
				{
					// First convert price to the default currency
					$price_converted_to_default_currency = Tools::convertPrice($price, $id_currency, false);

					// Convert the new price from default currency to needed currency
					$price = Tools::convertPrice($price_converted_to_default_currency, $warehouse->id_currency, true);
				}

				// add stock
				$stock_manager = StockManagerFactory::getManager();

				if ($stock_manager->addProduct($id_product, $id_product_attribute, $warehouse, $quantity, $id_stock_mvt_reason, $price, $usable))
				{
					StockAvailable::synchronize($id_product);
					if (Tools::isSubmit('addstockAndStay'))
					{
						$redirect = self::$currentIndex.'&id_product='.(int)$id_product;
						if ($id_product_attribute)
							$redirect .= '&id_product_attribute='.(int)$id_product_attribute;
						$redirect .= '&addstock&token='.$token;
					}
					Tools::redirectAdmin($redirect.'&conf=1');
				}
				else
					$this->errors[] = Tools::displayError('An error occured. No stock was added.');
			}
		}

		if (Tools::isSubmit('removestock') && Tools::isSubmit('is_post'))
		{
			// if all is ok, remove stock
			if (count($this->errors) == 0)
			{
				$warehouse = new Warehouse($id_warehouse);

				// remove stock
				$stock_manager = StockManagerFactory::getManager();
				$removed_products = $stock_manager->removeProduct($id_product, $id_product_attribute, $warehouse, $quantity, $id_stock_mvt_reason, $usable);

				if (count($removed_products) > 0)
				{
					StockAvailable::synchronize($id_product);
					Tools::redirectAdmin($redirect.'&conf=2');
				}
				else
					$this->errors[] = Tools::displayError('It is not possible to remove the specified quantity or an error occured. No stock was removed.');
			}
		}

		if (Tools::isSubmit('transferstock') && Tools::isSubmit('is_post'))
		{
			// get source warehouse id
			$id_warehouse_from = (int)Tools::getValue('id_warehouse_from', 0);
			if ($id_warehouse_from <= 0 || !Warehouse::exists($id_warehouse_from))
				$this->errors[] = Tools::displayError('The source warehouse is not valid.');

			// get destination warehouse id
			$id_warehouse_to = (int)Tools::getValue('id_warehouse_to', 0);
			if ($id_warehouse_to <= 0 || !Warehouse::exists($id_warehouse_to))
				$this->errors[] = Tools::displayError('The destination warehouse is not valid.');

			// get usable flag for source warehouse
			$usable_from = Tools::getValue('usable_from', null);
			if (is_null($usable_from))
				$this->errors[] = Tools::displayError('You have to specify if the product quantity is usable for sale on shops in source warehouse.');
			$usable_from = (bool)$usable_from;

			// get usable flag for destination warehouse
			$usable_to = Tools::getValue('usable_to', null);
			if (is_null($usable_to))
				$this->errors[] = Tools::displayError('You have to specify if the product quantity is usable for sale on shops in destination warehouse.');
			$usable_to = (bool)$usable_to;

			// if all is ok, transfer stock
			if (count($this->errors) == 0)
			{
				// transfer stock
				$stock_manager = StockManagerFactory::getManager();

				$is_transfer = $stock_manager->transferBetweenWarehouses(
					$id_product,
					$id_product_attribute,
					$quantity,
					$id_warehouse_from,
					$id_warehouse_to,
					$usable_from,
					$usable_to
				);

				if ($is_transfer)
					Tools::redirectAdmin($redirect.'&conf=3');
				else
					$this->errors[] = Tools::displayError('It is not possible to transfer the specified quantity, or an error occured. No stock was transfered.');
			}
		}
	}

	/**
	 * assign default action in toolbar_btn smarty var, if they are not set.
	 * uses override to specifically add, modify or remove items
	 *
	 */
	public function initToolbar()
	{
		switch ($this->display)
		{
			case 'addstock':
				$this->toolbar_btn['save-and-stay'] = array(
						'short' => 'SaveAndStay',
						'href' => '#',
						'desc' => $this->l('Save and stay'),
					);
			case 'removestock':
			case 'transferstock':
				$this->toolbar_btn['save'] = array(
					'href' => '#',
					'desc' => $this->l('Save')
				);

				// Default cancel button - like old back link
				$back = Tools::safeOutput(Tools::getValue('back', ''));
				if (empty($back))
					$back = self::$currentIndex.'&token='.$this->token;

				$this->toolbar_btn['cancel'] = array(
					'href' => $back,
					'desc' => $this->l('Cancel')
				);
			break;

			default:
				parent::initToolbar();
		}
	}

	/**
	 * AdminController::init() override
	 * @see AdminController::init()
	 */
	public function init()
	{
		parent::init();

		if (Tools::isSubmit('addstock'))
		{
			$this->display = 'addstock';
			$this->toolbar_title = $this->l('Stock : Add product');
		}

		if (Tools::isSubmit('removestock'))
		{
			$this->display = 'removestock';
			$this->toolbar_title = $this->l('Stock : Remove product');
		}

		if (Tools::isSubmit('transferstock'))
		{
			$this->display = 'transferstock';
			$this->toolbar_title = $this->l('Stock : Transfer product');
		}
	}

	/**
	 * method call when ajax request is made with the details row action
	 * @see AdminController::postProcess()
	 */
	public function ajaxProcess()
	{
		// test if an id is submit
		if (Tools::isSubmit('id'))
		{
			// override attributes
			$this->identifier = 'id_product_attribute';
			$this->display = 'list';
			$this->lang = false;

			$this->addRowAction('addstock');
			$this->addRowAction('removestock');
			$this->addRowAction('transferstock');

			// get current lang id
			$lang_id = (int)$this->context->language->id;

			// Get product id
			$product_id = (int)Tools::getValue('id');

			// Load product attributes with sql override
			$this->table = 'product_attribute';

			$this->_select = 'a.id_product_attribute as id, a.id_product, a.reference, a.ean13, a.upc';

			$this->_where = 'AND a.id_product = '.$product_id;
			$this->_group = 'GROUP BY a.id_product_attribute';

			// get list and force no limit clause in the request
			$this->getList($this->context->language->id, null, null, 0, false);

			// Render list
			$helper = new HelperList();
			$helper->bulk_actions = array();
			$helper->toolbar_fix = $this->toolbar_fix;
			$helper->show_toolbar = false;
			$helper->actions = $this->actions;
			$helper->list_skip_actions = $this->list_skip_actions;
			$helper->no_link = true;
			$helper->shopLinkType = '';
			$helper->identifier = $this->identifier;
			// Force render - no filter, form, js, sorting ...
			$helper->simple_header = true;
			$content = $helper->generateList($this->_list, $this->fieldsDisplay);

			echo Tools::jsonEncode(array('use_parent_structure' => false, 'data' => $content));
		}

		die;
	}

	/**
	 * AdminController::getList() override
	 * @see AdminController::getList()
	 */
	public function getList($id_lang, $order_by = null, $order_way = null, $start = 0, $limit = null, $id_lang_shop = false)
	{
		parent::getList($id_lang, $order_by, $order_way, $start, $limit, $id_lang_shop);

		if ($this->display == 'list')
		{
			// Check each row to see if there are combinations and get the correct action in consequence
			$nb_items = count($this->_list);

			for ($i = 0; $i < $nb_items; $i++)
			{
				$item = &$this->_list[$i];

				// if it's an ajax request we have to consider manipulating a product variation
				if ($this->ajax == '1')
				{
					$item['name'] = Product::getProductName($item['id_product'], $item['id']);
					// no details for this row
					$this->addRowActionSkipList('details', array($item['id']));

					// specify actions in function of stock
					$this->skipActionByStock($item, true);
				}
				// If current product has variations
				else if ((int)$item['variations'] > 0)
				{
					// we have to desactivate stock actions on current row
					$this->addRowActionSkipList('addstock', array($item['id']));
					$this->addRowActionSkipList('removestock', array($item['id']));
					$this->addRowActionSkipList('transferstock', array($item['id']));

					// does not display these informaions because this product has combinations
					$item['reference'] = '--';
					$item['ean13'] = '--';
					$item['upc'] = '--';
				}
				else
				{
					//there are no variations of current product, so we don't want to show details action
					$this->addRowActionSkipList('details', array($item['id']));

					// specify actions in function of stock
					$this->skipActionByStock($item, false);
				}
				// Checks access
				if (!($this->tabAccess['add'] === '1'))
					$this->addRowActionSkipList('addstock', array($item['id']));
				if (!($this->tabAccess['delete'] === '1'))
					$this->addRowActionSkipList('removestock', array($item['id']));
				if (!($this->tabAccess['edit'] === '1'))
					$this->addRowActionSkipList('transferstock', array($item['id']));
			}
		}
	}

	/**
	 * Check stock for a given product or product attribute
	 * and manage available actions in consequence
	 *
	 * @param array $item reference to the current item
	 * @param bool $is_product_attribute specify if it's a product or a product variation
	 */
	protected function skipActionByStock(&$item, $is_product_variation = false)
	{
		$stock_manager = StockManagerFactory::getManager();

		//get stocks for this product
		if ($is_product_variation)
			$stock = $stock_manager->getProductPhysicalQuantities($item['id_product'], $item['id']);
		else
			$stock = $stock_manager->getProductPhysicalQuantities($item['id'], 0);

		//affects stock to the list for display
		$item['stock'] = $stock;

		if ($stock <= 0)
		{
			//there is no stock, we can only add stock
			$this->addRowActionSkipList('removestock', array($item['id']));
			$this->addRowActionSkipList('transferstock', array($item['id']));
		}
	}

	/**
	 * AdminController::initContent() override
	 * @see AdminController::initContent()
	 */
	public function initContent()
	{
		// Manage the add stock form
		if ($this->display == 'addstock' || $this->display == 'removestock' || $this->display == 'transferstock')
		{
			if (Tools::isSubmit('id_product') || Tools::isSubmit('id_product_attribute'))
			{
				// get id product and product attribute if possible
				$id_product = (int)Tools::getValue('id_product', 0);
				$id_product_attribute = (int)Tools::getValue('id_product_attribute', 0);

				$product_is_valid = false;
				$is_pack = false;
				$is_virtual = false;
				$lang_id = $this->context->language->id;

				// try to load product attribute first
				if ($id_product_attribute > 0)
				{
					// try to load product attribute
					$combination = new Combination($id_product_attribute);
					if (Validate::isLoadedObject($combination))
					{
						$product_is_valid = true;
						$id_product = $combination->id_product;
						$reference = $combination->reference;
						$ean13 = $combination->ean13;
						$upc = $combination->upc;
						$manufacturer_reference = $combination->supplier_reference;

						// get the full name for this combination
						$query = new DbQuery();

						$query->select('IFNULL(CONCAT(pl.`name`, \' : \', GROUP_CONCAT(agl.`name`, \' - \', al.`name` SEPARATOR \', \')),pl.`name`) as name');
						$query->from('product_attribute', 'a');
						$query->join('INNER JOIN '._DB_PREFIX_.'product_lang pl ON (pl.`id_product` = a.`id_product` AND pl.`id_lang` = '.$lang_id.')
							LEFT JOIN '._DB_PREFIX_.'product_attribute_combination pac ON (pac.`id_product_attribute` = a.`id_product_attribute`)
							LEFT JOIN '._DB_PREFIX_.'attribute atr ON (atr.`id_attribute` = pac.`id_attribute`)
							LEFT JOIN '._DB_PREFIX_.'attribute_lang al ON (al.`id_attribute` = atr.`id_attribute` AND al.`id_lang` = '.$lang_id.')
							LEFT JOIN '._DB_PREFIX_.'attribute_group_lang agl ON (agl.`id_attribute_group` = atr.`id_attribute_group` AND agl.`id_lang` = '.$lang_id.')'
						);
						$query->where('a.`id_product_attribute` = '.$id_product_attribute);
						$name = Db::getInstance()->getValue($query);
					}
				}
				// try to load a simple product
				else
				{
					$product = new Product($id_product, false, $lang_id);
					if (is_int($product->id))
					{
						$product_is_valid = true;
						$reference = $product->reference;
						$ean13 = $product->ean13;
						$upc = $product->upc;
						$name = $product->name;
						$manufacturer_reference = $product->supplier_reference;
						$is_pack = $product->cache_is_pack;
						$is_virtual = $product->is_virtual;
					}
				}

				if ($product_is_valid === true && $is_pack == false && $is_virtual == false)
				{
					// init form
					$this->renderForm();
					$this->getlanguages();

					$helper = new HelperForm();

					// Check if form template has been overriden
					if (file_exists($this->context->smarty->getTemplateDir(0).'/'.$this->tpl_folder.'form.tpl'))
						$helper->tpl = $this->tpl_folder.'form.tpl';

					$this->setHelperDisplay($helper);
					$helper->submit_action = $this->display;
					$helper->id = null; // no display standard hidden field in the form
					$helper->languages = $this->_languages;
					$helper->default_form_language = $this->default_form_language;
					$helper->allow_employee_form_lang = $this->allow_employee_form_lang;

					$helper->fields_value = array(
						'id_product' => $id_product,
						'id_product_attribute' => $id_product_attribute,
						'reference' => $reference,
						'manufacturer_reference' => $manufacturer_reference,
						'name' => $name,
						'ean13' => $ean13,
						'upc' => $upc,
						'check' => md5(_COOKIE_KEY_.$id_product.$id_product_attribute),
						'quantity' => Tools::getValue('quantity', ''),
						'id_warehouse' => Tools::getValue('id_warehouse', ''),
						'usable' => ($this->fields_value['usable'] ? $this->fields_value['usable'] : Tools::getValue('usable', '')),
						'price' => Tools::getValue('price', ''),
						'id_currency' => Tools::getValue('id_currency', ''),
						'id_stock_mvt_reason' => Tools::getValue('id_stock_mvt_reason', ''),
						'is_post' => 1,
					);

					if ($this->display == 'transferstock')
					{
						$helper->fields_value['id_warehouse_from'] = Tools::getValue('id_warehouse_from', '');
						$helper->fields_value['id_warehouse_to'] = Tools::getValue('id_warehouse_to', '');
						$helper->fields_value['usable_from'] = Tools::getValue('usable_from', '');
						$helper->fields_value['usable_to'] = Tools::getValue('usable_to', '');
					}

					$this->content .= $helper->generateForm($this->fields_form);

					$this->context->smarty->assign(array(
						'content' => $this->content
					));
				}
				else
					$this->errors[] = Tools::displayError('The specified product is not valid');
			}
		}
		else
		{
			$this->display = 'list';
			parent::initContent();
		}
	}

	 /**
	 * Display addstock action link
	 * @param string $token the token to add to the link
	 * @param int $id the identifier to add to the link
	 * @return string
	 */
	public function displayAddstockLink($token = null, $id)
	{
        if (!array_key_exists('AddStock', self::$cache_lang))
            self::$cache_lang['AddStock'] = $this->l('Add stock');

        $this->context->smarty->assign(array(
            'href' => self::$currentIndex.
            	'&'.$this->identifier.'='.$id.
            	'&addstock&token='.($token != null ? $token : $this->token),
            'action' => self::$cache_lang['AddStock'],
        ));

        return $this->context->smarty->fetch('helpers/list/list_action_addstock.tpl');
	}

    /**
	 * Display removestock action link
	 * @param string $token the token to add to the link
	 * @param int $id the identifier to add to the link
	 * @return string
	 */
    public function displayRemovestockLink($token = null, $id)
    {
        if (!array_key_exists('RemoveStock', self::$cache_lang))
            self::$cache_lang['RemoveStock'] = $this->l('Remove stock');

        $this->context->smarty->assign(array(
            'href' => self::$currentIndex.
            	'&'.$this->identifier.'='.$id.
            	'&removestock&token='.($token != null ? $token : $this->token),
            'action' => self::$cache_lang['RemoveStock'],
        ));

        return $this->context->smarty->fetch('helpers/list/list_action_removestock.tpl');
    }

    /**
	 * Display transferstock action link
	 * @param string $token the token to add to the link
	 * @param int $id the identifier to add to the link
	 * @return string
	 */
    public function displayTransferstockLink($token = null, $id)
    {
        if (!array_key_exists('TransferStock', self::$cache_lang))
            self::$cache_lang['TransferStock'] = $this->l('Transfer stock');

        $this->context->smarty->assign(array(
            'href' => self::$currentIndex.
            	'&'.$this->identifier.'='.$id.
            	'&transferstock&token='.($token != null ? $token : $this->token),
            'action' => self::$cache_lang['TransferStock'],
        ));

        return $this->context->smarty->fetch('helpers/list/list_action_transferstock.tpl');
    }
}