<?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 ProductSaleCore
{
    /*
    ** Fill the `product_sale` SQL table with data from `order_detail`
    ** @return bool True on success
    */
    public static function fillProductSales()
    {
        $sql = 'REPLACE INTO '._DB_PREFIX_.'product_sale
				(`id_product`, `quantity`, `sale_nbr`, `date_upd`)
				SELECT od.product_id, SUM(od.product_quantity), COUNT(od.product_id), NOW()
							FROM '._DB_PREFIX_.'order_detail od GROUP BY od.product_id';
        return Db::getInstance()->execute($sql);
    }

    /*
    ** Get number of actives products sold
    ** @return int number of actives products listed in product_sales
    */
    public static function getNbSales()
    {
        $sql = 'SELECT COUNT(ps.`id_product`) AS nb
				FROM `'._DB_PREFIX_.'product_sale` ps
				LEFT JOIN `'._DB_PREFIX_.'product` p ON p.`id_product` = ps.`id_product`
				'.Shop::addSqlAssociation('product', 'p', false).'
				WHERE product_shop.`active` = 1';
        return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue($sql);
    }

    /*
    ** Get required informations on best sales products
    **
    ** @param int $id_lang Language id
    ** @param int $page_number Start from (optional)
    ** @param int $nb_products Number of products to return (optional)
    ** @return array from Product::getProductProperties
    */
    public static function getBestSales($id_lang, $page_number = 0, $nb_products = 10, $order_by = null, $order_way = null)
    {
        $context = Context::getContext();
        if ($page_number < 0) {
            $page_number = 0;
        }
        if ($nb_products < 1) {
            $nb_products = 10;
        }
        $final_order_by = $order_by;
        $order_table = '';

        if (is_null($order_by)) {
            $order_by = 'quantity';
            $order_table = 'ps';
        }

        if ($order_by == 'date_add' || $order_by == 'date_upd') {
            $order_table = 'product_shop';
        }

        if (is_null($order_way) || $order_by == 'sales') {
            $order_way = 'DESC';
        }

        $interval = Validate::isUnsignedInt(Configuration::get('PS_NB_DAYS_NEW_PRODUCT')) ? Configuration::get('PS_NB_DAYS_NEW_PRODUCT') : 20;

        // no group by needed : there's only one attribute with default_on=1 for a given id_product + shop
        // same for image with cover=1
        $sql = 'SELECT p.*, product_shop.*, stock.out_of_stock, IFNULL(stock.quantity, 0) as quantity,
					'.(Combination::isFeatureActive()?'product_attribute_shop.minimal_quantity AS product_attribute_minimal_quantity,IFNULL(product_attribute_shop.id_product_attribute,0) id_product_attribute,':'').'
					pl.`description`, pl.`description_short`, pl.`link_rewrite`, pl.`meta_description`,
					pl.`meta_keywords`, pl.`meta_title`, pl.`name`, pl.`available_now`, pl.`available_later`,
					m.`name` AS manufacturer_name, p.`id_manufacturer` as id_manufacturer,
					image_shop.`id_image` id_image, il.`legend`,
					ps.`quantity` AS sales, t.`rate`, pl.`meta_keywords`, pl.`meta_title`, pl.`meta_description`,
					DATEDIFF(p.`date_add`, DATE_SUB("'.date('Y-m-d').' 00:00:00",
					INTERVAL '.(int)$interval.' DAY)) > 0 AS new'
                .' FROM `'._DB_PREFIX_.'product_sale` ps
				LEFT JOIN `'._DB_PREFIX_.'product` p ON ps.`id_product` = p.`id_product`
				'.Shop::addSqlAssociation('product', 'p', false);
        if (Combination::isFeatureActive()) {
            $sql .= ' LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` product_attribute_shop
							ON (p.`id_product` = product_attribute_shop.`id_product` AND product_attribute_shop.`default_on` = 1 AND product_attribute_shop.id_shop='.(int)$context->shop->id.')';
        }

        $sql .=    ' LEFT JOIN `'._DB_PREFIX_.'product_lang` pl
					ON p.`id_product` = pl.`id_product`
					AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').'
				LEFT JOIN `'._DB_PREFIX_.'image_shop` image_shop
					ON (image_shop.`id_product` = p.`id_product` AND image_shop.cover=1 AND image_shop.id_shop='.(int)$context->shop->id.')
				LEFT JOIN `'._DB_PREFIX_.'image_lang` il ON (image_shop.`id_image` = il.`id_image` AND il.`id_lang` = '.(int)$id_lang.')
				LEFT JOIN `'._DB_PREFIX_.'manufacturer` m ON (m.`id_manufacturer` = p.`id_manufacturer`)
				LEFT JOIN `'._DB_PREFIX_.'tax_rule` tr ON (product_shop.`id_tax_rules_group` = tr.`id_tax_rules_group`)
					AND tr.`id_country` = '.(int)$context->country->id.'
					AND tr.`id_state` = 0
				LEFT JOIN `'._DB_PREFIX_.'tax` t ON (t.`id_tax` = tr.`id_tax`)
				'.Product::sqlStock('p', 0);

        $sql .= '
				WHERE product_shop.`active` = 1
					AND p.`visibility` != \'none\'';

        if (Group::isFeatureActive()) {
            $groups = FrontController::getCurrentCustomerGroups();
            $sql .= ' AND EXISTS(SELECT 1 FROM `'._DB_PREFIX_.'category_product` cp
					JOIN `'._DB_PREFIX_.'category_group` cg ON (cp.id_category = cg.id_category AND cg.`id_group` '.(count($groups) ? 'IN ('.implode(',', $groups).')' : '= 1').')
					WHERE cp.`id_product` = p.`id_product`)';
        }

        if ($final_order_by != 'price') {
            $sql .= '
					ORDER BY '.(!empty($order_table) ? '`'.pSQL($order_table).'`.' : '').'`'.pSQL($order_by).'` '.pSQL($order_way).'
					LIMIT '.(int)($page_number * $nb_products).', '.(int)$nb_products;
        }

        $result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($sql);

        if ($final_order_by == 'price') {
            Tools::orderbyPrice($result, $order_way);
        }
        if (!$result) {
            return false;
        }
        return Product::getProductsProperties($id_lang, $result);
    }

    /*
    ** Get required informations on best sales products
    **
    ** @param int $id_lang Language id
    ** @param int $page_number Start from (optional)
    ** @param int $nb_products Number of products to return (optional)
    ** @return array keys : id_product, link_rewrite, name, id_image, legend, sales, ean13, upc, link
    */
    public static function getBestSalesLight($id_lang, $page_number = 0, $nb_products = 10, Context $context = null)
    {
        if (!$context) {
            $context = Context::getContext();
        }
        if ($page_number < 0) {
            $page_number = 0;
        }
        if ($nb_products < 1) {
            $nb_products = 10;
        }

        // no group by needed : there's only one attribute with default_on=1 for a given id_product + shop
        // same for image with cover=1
        $sql = '
		SELECT
			p.id_product, IFNULL(product_attribute_shop.id_product_attribute,0) id_product_attribute, pl.`link_rewrite`, pl.`name`, pl.`description_short`, product_shop.`id_category_default`,
			image_shop.`id_image` id_image, il.`legend`,
			ps.`quantity` AS sales, p.`ean13`, p.`upc`, cl.`link_rewrite` AS category, p.show_price, p.available_for_order, IFNULL(stock.quantity, 0) as quantity, p.customizable,
			IFNULL(pa.minimal_quantity, p.minimal_quantity) as minimal_quantity, stock.out_of_stock,
			product_shop.`date_add` > "'.date('Y-m-d', strtotime('-'.(Configuration::get('PS_NB_DAYS_NEW_PRODUCT') ? (int)Configuration::get('PS_NB_DAYS_NEW_PRODUCT') : 20).' DAY')).'" as new,
			product_shop.`on_sale`, product_attribute_shop.minimal_quantity AS product_attribute_minimal_quantity
		FROM `'._DB_PREFIX_.'product_sale` ps
		LEFT JOIN `'._DB_PREFIX_.'product` p ON ps.`id_product` = p.`id_product`
		'.Shop::addSqlAssociation('product', 'p').'
		LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` product_attribute_shop
			ON (p.`id_product` = product_attribute_shop.`id_product` AND product_attribute_shop.`default_on` = 1 AND product_attribute_shop.id_shop='.(int)$context->shop->id.')
		LEFT JOIN `'._DB_PREFIX_.'product_attribute` pa ON (product_attribute_shop.id_product_attribute=pa.id_product_attribute)
		LEFT JOIN `'._DB_PREFIX_.'product_lang` pl
			ON p.`id_product` = pl.`id_product`
			AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').'
		LEFT JOIN `'._DB_PREFIX_.'image_shop` image_shop
			ON (image_shop.`id_product` = p.`id_product` AND image_shop.cover=1 AND image_shop.id_shop='.(int)$context->shop->id.')
		LEFT JOIN `'._DB_PREFIX_.'image_lang` il ON (image_shop.`id_image` = il.`id_image` AND il.`id_lang` = '.(int)$id_lang.')
		LEFT JOIN `'._DB_PREFIX_.'category_lang` cl
			ON cl.`id_category` = product_shop.`id_category_default`
			AND cl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('cl').Product::sqlStock('p', 0);

        $sql .= '
		WHERE product_shop.`active` = 1
		AND p.`visibility` != \'none\'';

        if (Group::isFeatureActive()) {
            $groups = FrontController::getCurrentCustomerGroups();
            $sql .= ' AND EXISTS(SELECT 1 FROM `'._DB_PREFIX_.'category_product` cp
				JOIN `'._DB_PREFIX_.'category_group` cg ON (cp.id_category = cg.id_category AND cg.`id_group` '.(count($groups) ? 'IN ('.implode(',', $groups).')' : '= 1').')
				WHERE cp.`id_product` = p.`id_product`)';
        }

        $sql .= '
		ORDER BY ps.quantity DESC
		LIMIT '.(int)($page_number * $nb_products).', '.(int)$nb_products;

        if (!$result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($sql)) {
            return false;
        }

        return Product::getProductsProperties($id_lang, $result);
    }

    public static function addProductSale($product_id, $qty = 1)
    {
        return Db::getInstance()->execute('
			INSERT INTO '._DB_PREFIX_.'product_sale
			(`id_product`, `quantity`, `sale_nbr`, `date_upd`)
			VALUES ('.(int)$product_id.', '.(int)$qty.', 1, NOW())
			ON DUPLICATE KEY UPDATE `quantity` = `quantity` + '.(int)$qty.', `sale_nbr` = `sale_nbr` + 1, `date_upd` = NOW()');
    }

    public static function getNbrSales($id_product)
    {
        $result = Db::getInstance()->getRow('SELECT `sale_nbr` FROM '._DB_PREFIX_.'product_sale WHERE `id_product` = '.(int)$id_product);
        if (!$result || empty($result) || !array_key_exists('sale_nbr', $result)) {
            return -1;
        }
        return (int)$result['sale_nbr'];
    }

    public static function removeProductSale($id_product, $qty = 1)
    {
        $total_sales = ProductSale::getNbrSales($id_product);
        if ($total_sales > 1) {
            return Db::getInstance()->execute('
				UPDATE '._DB_PREFIX_.'product_sale
				SET `quantity` = CAST(`quantity` AS SIGNED) - '.(int)$qty.', `sale_nbr` = CAST(`sale_nbr` AS SIGNED) - 1, `date_upd` = NOW()
				WHERE `id_product` = '.(int)$id_product
            );
        } elseif ($total_sales == 1) {
            return Db::getInstance()->delete('product_sale', 'id_product = '.(int)$id_product);
        }
        return true;
    }
}