<?php
/*
 * 2022-2024 PhenixSuite©
 *
 * PhenixSuite is a fork of the PrestaShop version 1.6 software originally created by PrestaShop SA
 *
 * 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@phenixsuite.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop/PhenixSuite to newer
 * versions in the future. If you wish to customize PhenixSuite for your
 * needs please refer to https://phenixsuite.com for more information.
 *
 *  @author    PhenixSuite <contact@phenixsuite.com>
 *  @author    PrestaShop SA <contact@prestashop.com>
 *  @copyright 2022-2024 PhenixSuite
 *  @copyright 2007-2017 PrestaShop SA
 *  @license   https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 *  PrestaShop is an internationally registered trademark & property of PrestaShop SA
*/

/*
* 2022 Eolia & Doekia
* Index optimisation
* All rights reserved
*/

define('PS_SEARCH_MAX_WORD_LENGTH', 15);

/* Copied from Drupal search module, except for \x{0}-\x{2f}
* that has been replaced by \x{0}-\x{2c}\x{2e}-\x{2f} in order to keep the char '-'
*/
define('PREG_CLASS_SEARCH_EXCLUDE',
'\x{0}-\x{2c}\x{2e}-\x{2f}\x{3a}-\x{40}\x{5b}-\x{60}\x{7b}-\x{bf}\x{d7}\x{f7}\x{2b0}-'.
'\x{385}\x{387}\x{3f6}\x{482}-\x{489}\x{559}-\x{55f}\x{589}-\x{5c7}\x{5f3}-'.
'\x{61f}\x{640}\x{64b}-\x{65e}\x{66a}-\x{66d}\x{670}\x{6d4}\x{6d6}-\x{6ed}'.
'\x{6fd}\x{6fe}\x{700}-\x{70f}\x{711}\x{730}-\x{74a}\x{7a6}-\x{7b0}\x{901}-'.
'\x{903}\x{93c}\x{93e}-\x{94d}\x{951}-\x{954}\x{962}-\x{965}\x{970}\x{981}-'.
'\x{983}\x{9bc}\x{9be}-\x{9cd}\x{9d7}\x{9e2}\x{9e3}\x{9f2}-\x{a03}\x{a3c}-'.
'\x{a4d}\x{a70}\x{a71}\x{a81}-\x{a83}\x{abc}\x{abe}-\x{acd}\x{ae2}\x{ae3}'.
'\x{af1}-\x{b03}\x{b3c}\x{b3e}-\x{b57}\x{b70}\x{b82}\x{bbe}-\x{bd7}\x{bf0}-'.
'\x{c03}\x{c3e}-\x{c56}\x{c82}\x{c83}\x{cbc}\x{cbe}-\x{cd6}\x{d02}\x{d03}'.
'\x{d3e}-\x{d57}\x{d82}\x{d83}\x{dca}-\x{df4}\x{e31}\x{e34}-\x{e3f}\x{e46}-'.
'\x{e4f}\x{e5a}\x{e5b}\x{eb1}\x{eb4}-\x{ebc}\x{ec6}-\x{ecd}\x{f01}-\x{f1f}'.
'\x{f2a}-\x{f3f}\x{f71}-\x{f87}\x{f90}-\x{fd1}\x{102c}-\x{1039}\x{104a}-'.
'\x{104f}\x{1056}-\x{1059}\x{10fb}\x{10fc}\x{135f}-\x{137c}\x{1390}-\x{1399}'.
'\x{166d}\x{166e}\x{1680}\x{169b}\x{169c}\x{16eb}-\x{16f0}\x{1712}-\x{1714}'.
'\x{1732}-\x{1736}\x{1752}\x{1753}\x{1772}\x{1773}\x{17b4}-\x{17db}\x{17dd}'.
'\x{17f0}-\x{180e}\x{1843}\x{18a9}\x{1920}-\x{1945}\x{19b0}-\x{19c0}\x{19c8}'.
'\x{19c9}\x{19de}-\x{19ff}\x{1a17}-\x{1a1f}\x{1d2c}-\x{1d61}\x{1d78}\x{1d9b}-'.
'\x{1dc3}\x{1fbd}\x{1fbf}-\x{1fc1}\x{1fcd}-\x{1fcf}\x{1fdd}-\x{1fdf}\x{1fed}-'.
'\x{1fef}\x{1ffd}-\x{2070}\x{2074}-\x{207e}\x{2080}-\x{2101}\x{2103}-\x{2106}'.
'\x{2108}\x{2109}\x{2114}\x{2116}-\x{2118}\x{211e}-\x{2123}\x{2125}\x{2127}'.
'\x{2129}\x{212e}\x{2132}\x{213a}\x{213b}\x{2140}-\x{2144}\x{214a}-\x{2b13}'.
'\x{2ce5}-\x{2cff}\x{2d6f}\x{2e00}-\x{3005}\x{3007}-\x{303b}\x{303d}-\x{303f}'.
'\x{3099}-\x{309e}\x{30a0}\x{30fb}\x{30fd}\x{30fe}\x{3190}-\x{319f}\x{31c0}-'.
'\x{31cf}\x{3200}-\x{33ff}\x{4dc0}-\x{4dff}\x{a015}\x{a490}-\x{a716}\x{a802}'.
'\x{e000}-\x{f8ff}\x{fb29}\x{fd3e}-\x{fd3f}\x{fdfc}-\x{fdfd}'.
'\x{fd3f}\x{fdfc}-\x{fe6b}\x{feff}-\x{ff0f}\x{ff1a}-\x{ff20}\x{ff3b}-\x{ff40}'.
'\x{ff5b}-\x{ff65}\x{ff70}\x{ff9e}\x{ff9f}\x{ffe0}-\x{fffd}');

define('PREG_CLASS_NUMBERS',
'\x{30}-\x{39}\x{b2}\x{b3}\x{b9}\x{bc}-\x{be}\x{660}-\x{669}\x{6f0}-\x{6f9}'.
'\x{966}-\x{96f}\x{9e6}-\x{9ef}\x{9f4}-\x{9f9}\x{a66}-\x{a6f}\x{ae6}-\x{aef}'.
'\x{b66}-\x{b6f}\x{be7}-\x{bf2}\x{c66}-\x{c6f}\x{ce6}-\x{cef}\x{d66}-\x{d6f}'.
'\x{e50}-\x{e59}\x{ed0}-\x{ed9}\x{f20}-\x{f33}\x{1040}-\x{1049}\x{1369}-'.
'\x{137c}\x{16ee}-\x{16f0}\x{17e0}-\x{17e9}\x{17f0}-\x{17f9}\x{1810}-\x{1819}'.
'\x{1946}-\x{194f}\x{2070}\x{2074}-\x{2079}\x{2080}-\x{2089}\x{2153}-\x{2183}'.
'\x{2460}-\x{249b}\x{24ea}-\x{24ff}\x{2776}-\x{2793}\x{3007}\x{3021}-\x{3029}'.
'\x{3038}-\x{303a}\x{3192}-\x{3195}\x{3220}-\x{3229}\x{3251}-\x{325f}\x{3280}-'.
'\x{3289}\x{32b1}-\x{32bf}\x{ff10}-\x{ff19}');

define('PREG_CLASS_PUNCTUATION',
//'\x{21}-\x{23}\x{25}-\x{2a}\x{2c}-\x{2f}\x{3a}\x{3b}\x{3f}\x{40}\x{5b}-\x{5d}'.
'\x{5f}\x{7b}\x{7d}\x{a1}\x{ab}\x{b7}\x{bb}\x{bf}\x{37e}\x{387}\x{55a}-\x{55f}'.
'\x{589}\x{58a}\x{5be}\x{5c0}\x{5c3}\x{5f3}\x{5f4}\x{60c}\x{60d}\x{61b}\x{61f}'.
'\x{66a}-\x{66d}\x{6d4}\x{700}-\x{70d}\x{964}\x{965}\x{970}\x{df4}\x{e4f}'.
'\x{e5a}\x{e5b}\x{f04}-\x{f12}\x{f3a}-\x{f3d}\x{f85}\x{104a}-\x{104f}\x{10fb}'.
'\x{1361}-\x{1368}\x{166d}\x{166e}\x{169b}\x{169c}\x{16eb}-\x{16ed}\x{1735}'.
'\x{1736}\x{17d4}-\x{17d6}\x{17d8}-\x{17da}\x{1800}-\x{180a}\x{1944}\x{1945}'.
'\x{2010}-\x{2027}\x{2030}-\x{2043}\x{2045}-\x{2051}\x{2053}\x{2054}\x{2057}'.
'\x{207d}\x{207e}\x{208d}\x{208e}\x{2329}\x{232a}\x{23b4}-\x{23b6}\x{2768}-'.
'\x{2775}\x{27e6}-\x{27eb}\x{2983}-\x{2998}\x{29d8}-\x{29db}\x{29fc}\x{29fd}'.
'\x{3001}-\x{3003}\x{3008}-\x{3011}\x{3014}-\x{301f}\x{3030}\x{303d}\x{30a0}'.
'\x{30fb}\x{fd3e}\x{fd3f}\x{fe30}-\x{fe52}\x{fe54}-\x{fe61}\x{fe63}\x{fe68}'.
'\x{fe6a}\x{fe6b}\x{ff01}-\x{ff03}\x{ff05}-\x{ff0a}\x{ff0c}-\x{ff0f}\x{ff1a}'.
'\x{ff1b}\x{ff1f}\x{ff20}\x{ff3b}-\x{ff3d}\x{ff3f}\x{ff5b}\x{ff5d}\x{ff5f}-'.
'\x{ff65}');

/**
 * Matches all CJK characters that are candidates for auto-splitting
 * (Chinese, Japanese, Korean).
 * Contains kana and BMP ideographs.
 */
define('PREG_CLASS_CJK', '\x{3041}-\x{30ff}\x{31f0}-\x{31ff}\x{3400}-\x{4db5}\x{4e00}-\x{9fbb}\x{f900}-\x{fad9}');

class SearchCore
{
    public static function sanitize($string, $id_lang, $indexation = false, $iso_code = false)
    {
        $string = trim($string);
        if(empty($string)) {
            return '';
        }
        $string = preg_replace('!<\s*/?\s*br[^>]*>!i', ' ', $string);
        $string = Tools::strtolower(strip_tags($string));
        $string = html_entity_decode($string, ENT_NOQUOTES, 'utf-8');

        $string = preg_replace('/(['.PREG_CLASS_NUMBERS.']+)['.PREG_CLASS_PUNCTUATION.']+(?=['.PREG_CLASS_NUMBERS.'])/u', '\1', $string);
        $string = preg_replace('/['.PREG_CLASS_SEARCH_EXCLUDE.']+/u', ' ', $string);

        if($indexation) {
            $string = preg_replace('/[._-]+/', ' ', $string);
        }
        else {
            $words = explode(' ', $string);
            $processed_words = array();
            // search for aliases for each word of the query
            foreach($words as $word) {
                $alias = new Alias(null, $word);
                if(Validate::isLoadedObject($alias)) {
                    $processed_words[] = $alias->search;
                }
                else {
                    $processed_words[] = $word;
                }
            }
            $string = implode(' ', $processed_words);
            $string = preg_replace('/[._]+/', '', $string);
            $string = ltrim(preg_replace('/([^ ])-/', '$1 ', ' '.$string));
            $string = preg_replace('/[._]+/', '', $string);
            $string = preg_replace('/[^\s]-+/', '', $string);
        }

        $blacklist = Tools::strtolower(Configuration::get('PS_SEARCH_BLACKLIST', $id_lang));
        if(!empty($blacklist)) {
            $string = preg_replace('/(?<=\s)('.$blacklist.')(?=\s)/Su', '', $string);
            $string = preg_replace('/^('.$blacklist.')(?=\s)/Su', '', $string);
            $string = preg_replace('/(?<=\s)('.$blacklist.')$/Su', '', $string);
            $string = preg_replace('/^('.$blacklist.')$/Su', '', $string);
        }

        // If the language is constituted with symbol and there is no "words",
        // then split every chars
        if(in_array($iso_code, array('zh', 'tw', 'ja'))
            && function_exists('mb_strlen')
        ) {
            // Cut symbols from letters
            $symbols = '';
            $letters = '';
            foreach(explode(' ', $string) as $mb_word) {
                if(strlen(Tools::replaceAccentedChars($mb_word)) == mb_strlen(Tools::replaceAccentedChars($mb_word))) {
                    $letters .= $mb_word.' ';
                }
                else {
                    $symbols .= $mb_word.' ';
                }
            }

            if(preg_match_all('/./u', $symbols, $matches)) {
                $symbols = implode(' ', $matches[0]);
            }

            $string = $letters.$symbols;
        }
        elseif($indexation) {
            $minWordLen = (int)Configuration::get('PS_SEARCH_MINWORDLEN');
            if($minWordLen > 1) {
                $minWordLen -= 1;
                $string = preg_replace('/(?<=\s)[^\s]{1,'.$minWordLen.'}(?=\s)/Su', ' ', $string);
                $string = preg_replace('/^[^\s]{1,'.$minWordLen.'}(?=\s)/Su', '', $string);
                $string = preg_replace('/(?<=\s)[^\s]{1,'.$minWordLen.'}$/Su', '', $string);
                $string = preg_replace('/^[^\s]{1,'.$minWordLen.'}$/Su', '', $string);
            }
        }

        $string = Tools::replaceAccentedChars(trim(preg_replace('/\s+/', ' ', $string)));

        return $string;
    }

    public static function find($id_lang, $expr, $page_number = 1, $page_size = 1, $order_by = 'position',
        $order_way = 'desc', $ajax = false, $use_cookie = true, Context $context = null)
    {
        if(!$context) {
            $context = Context::getContext();
        }
        $db = Db::getInstance(_PS_USE_SQL_SLAVE_);

        // Only use cookie if id_customer is not present
        if($use_cookie) {
            $id_customer = $context->customer->id;
        }
        else {
            $id_customer = 0;
        }

        // TODO : smart page management
        if($page_number < 1) {
            $page_number = 1;
        }
        if($page_size < 1) {
            $page_size = 1;
        }

        if(!Validate::isOrderBy($order_by) || !Validate::isOrderWay($order_way)) {
            return false;
        }
        $sql_groups = '';
        if(Group::isFeatureActive()) {
            $groups = FrontController::getCurrentCustomerGroups();
            empty($groups) && ($groups = array((int)Configuration::get('PS_UNIDENTIFIED_GROUP')));
            $sql_groups = 'AND cg.`id_group` IN ('.implode(',', $groups).')';
        }
        // Search reference first - Eolia added
        $total = 0;
        if(Configuration::get('PS_PRIORIZE_WEIGHT_REF')) {
            $sql = '
                SELECT DISTINCT product_shop.`id_product`, p.`reference`, 
                    pa.`reference` as attribute_reference, i.`id_image`, 
                    IFNULL(pa.`id_product_attribute`, 0) as id_product_attribute
                FROM `'._DB_PREFIX_.'product` p
                '.Shop::addSqlAssociation('product', 'p', false).'
                LEFT JOIN `'._DB_PREFIX_.'product_attribute` pa
                    ON(pa.`id_product` = p.`id_product`)
                '.(Combination::isFeatureActive() ? '
                    LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` pas
                        ON(pa.`id_product_attribute` = pas.`id_product_attribute`
                        AND pas.`id_shop` = '.(int)Context::getContext()->shop->id.')':'').'
                INNER JOIN `'._DB_PREFIX_.'product_lang` pl
                    ON(p.`id_product` = pl.`id_product`
                    AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').')
                LEFT JOIN `'._DB_PREFIX_.'image_shop` i
                    ON(i.`id_product` = p.`id_product`
                    AND i.`id_shop` = '.(int)Context::getContext()->shop->id.'
                    AND i.`cover` = 1
                    AND i.`id_lang` IN (0, '.(int)Context::getContext()->language->id.'))
                LEFT JOIN `'._DB_PREFIX_.'category_product` cp
                    ON(cp.`id_product` = p.`id_product`)
                '.(Group::isFeatureActive() ? '
                    INNER JOIN `'._DB_PREFIX_.'category_group` cg
                        ON(cg.`id_category` = cp.`id_category`)' : '').'
                LEFT JOIN `'._DB_PREFIX_.'category_shop` cs
                    ON(cp.`id_category` = cs.`id_category`
                    AND cs.`id_shop` = '.(int)Context::getContext()->shop->id.')
                '.Product::sqlStock('p', 0).'
                WHERE (p.`reference` LIKE "%'.pSQL($expr).'%"
                    OR pa.`reference` LIKE "%'.pSQL($expr).'%")
                AND product_shop.`visibility` IN ("both", "search")
                '.(Configuration::get('PS_HIDE_OOS') ? '
                    AND stock.`quantity` > 0 ' : '').'
                '.(Combination::isFeatureActive() ? '
                    AND product_shop.`cache_default_attribute` = IFNULL(pa.`id_product_attribute`, 0)' : '').'
                '.(Group::isGroupProductRestriction() ? '
                    AND EXISTS (
                        SELECT 1
                        FROM `'._DB_PREFIX_.'product_group` pg
                        WHERE (pg.`id_product` = p.`id_product`
                        AND pg.`id_group` IN ('.implode(',', $groups).'))
                    )' : '').'
                '.$sql_groups.'
                AND product_shop.`active` = 1';

            $eligible_products = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($sql, true, false);

            $total = count($eligible_products);
        }
        if($total) {
            $alias = '';
            if($order_by == 'price') {
                $alias = 'product_shop.';
            }
            elseif(in_array($order_by, array('date_upd', 'date_add'))) {
                $alias = 'p.';
            }

            if($ajax) {
                $product_pool = array();
                foreach($eligible_products as $product) {
                    $product_pool[] = (int)$product['id_product'];
                }
                $products = $db->executeS('
                    SELECT DISTINCT p.`id_product`, pl.`name` pname, cl.`name` cname,
                        cl.`link_rewrite` crewrite, pl.`link_rewrite` prewrite, i.`id_image`, 
                        pl.`catch_phrase`, p.`reference`, pa.`reference` as attribute_reference, 
                        IFNULL(pa.`id_product_attribute`, 0) as id_product_attribute, 
                        IFNULL(pai.`id_image`, 0) as attribute_image
                    FROM `'._DB_PREFIX_.'product` p
                    '.Shop::addSqlAssociation('product', 'p').'
                    '.Product::sqlStock('p', 0).'
                    LEFT JOIN `'._DB_PREFIX_.'product_attribute` pa
                        ON(pa.`id_product` = p.`id_product`)
                    '.(Combination::isFeatureActive() ? '
                        LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` pas
                            ON(pa.`id_product_attribute` = pas.`id_product_attribute`
                            AND pas.`id_shop` = '.(int)Context::getContext()->shop->id.')':'').'
                    LEFT JOIN `'._DB_PREFIX_.'product_attribute_image` pai
                        ON(pai.`id_product_attribute` = pa.`id_product_attribute`)
                    INNER JOIN `'._DB_PREFIX_.'product_lang` pl
                        ON(p.`id_product` = pl.`id_product`
                        AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').')
                    LEFT JOIN `'._DB_PREFIX_.'image_shop` i
                        ON(i.`id_product` = p.`id_product`
                        AND i.`id_shop` = '.(int)Context::getContext()->shop->id.'
                        AND i.`cover` = 1
                        AND i.`id_lang` IN (0, '.(int)Context::getContext()->language->id.'))
                    INNER JOIN `'._DB_PREFIX_.'category_lang` cl
                        ON(product_shop.`id_category_default` = cl.`id_category`
                        AND cl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('cl').')
                    WHERE p.`id_product` IN('.implode(',', $product_pool).')
                    '.(Configuration::get('PS_HIDE_OOS') ? '
                        AND stock.`quantity` > 0 ' : '').'
                    '.(Combination::isFeatureActive() ? '
                        AND product_shop.`cache_default_attribute` = IFNULL(pa.`id_product_attribute`, 0)' : '').'
                    AND (p.`reference` LIKE "%'.pSQL($expr).'%"
                        OR pa.`reference` LIKE "%'.pSQL($expr).'%")
                    GROUP BY pa.`reference`, p.`reference`
                    ORDER BY p.`reference`
                    DESC LIMIT '.(int)Configuration::get('PS_SEARCH_AJAX_MAX')
                , true, false);

                foreach($products as &$product) {
                    if($product['id_product_attribute'] && $product['attribute_image']) {
                        $product['id_image'] = $product['attribute_image'];
                    }
                }
                return $products;
            }
            $result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
                SELECT DISTINCT p.*, product_shop.*, stock.`out_of_stock`,
                    IFNULL(stock.`quantity`, 0) as quantity, pl.`description_short`, pl.`catch_phrase`,
                    pl.`link_rewrite`, pl.`name`, cl.`link_rewrite` crewrite, pl.`link_rewrite` prewrite,
                    MAX(i.`id_image`) id_image, il.`legend`, m.`name` manufacturer_name, 1 position, 
                    IFNULL(pa.`id_product_attribute`, 0) as id_product_attribute,
                    IFNULL(pai.`id_image`, 0) as attribute_image,
                DATEDIFF(
                    p.`date_add`,
                    DATE_SUB(
                        NOW(),
                        INTERVAL '._PS_NB_DAYS_NEW_PRODUCT_.' DAY
                    )
                ) > 0 new
                FROM `'._DB_PREFIX_.'product` p
                '.Shop::addSqlAssociation('product', 'p', false).'
                LEFT JOIN `'._DB_PREFIX_.'product_attribute` pa
                    ON(pa.`id_product` = p.`id_product`)
                '.(Combination::isFeatureActive() ? '
                    LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` pas
                        ON(pa.`id_product_attribute` = pas.`id_product_attribute`
                        AND pas.`id_shop` = '.(int)Context::getContext()->shop->id.')':'').'
                LEFT JOIN `'._DB_PREFIX_.'product_attribute_image` pai
                    ON(pai.`id_product_attribute` = pa.`id_product_attribute`)
                INNER JOIN `'._DB_PREFIX_.'product_lang` pl
                    ON(p.`id_product` = pl.`id_product`
                    AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').')
                INNER JOIN `'._DB_PREFIX_.'category_lang` cl
                    ON(product_shop.`id_category_default` = cl.`id_category`
                    AND cl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('cl').')
                LEFT JOIN `'._DB_PREFIX_.'image_shop` i
                    ON(i.`id_product` = p.`id_product`
                    AND i.`id_shop` = '.(int)Context::getContext()->shop->id.'
                    AND i.`cover` = 1
                    AND i.`id_lang` IN (0, '.(int)Context::getContext()->language->id.'))
                LEFT JOIN `'._DB_PREFIX_.'image_lang` il
                    ON(i.`id_image` = il.`id_image`
                    AND il.`id_lang` = '.(int)$id_lang.')
                LEFT JOIN `'._DB_PREFIX_.'manufacturer` m
                    ON(m.`id_manufacturer` = p.`id_manufacturer`)
                -- LEFT JOIN `'._DB_PREFIX_.'product_tag` pt
                --    ON(p.`id_product` = pt.`id_product`)
                -- LEFT JOIN `'._DB_PREFIX_.'tag` t
                --    ON(pt.`id_tag` = t.`id_tag`
                --    AND t.`id_lang` = '.(int)$id_lang.')
                LEFT JOIN `'._DB_PREFIX_.'category_product` cp
                    ON(cp.`id_product` = p.`id_product`)
                '.(Group::isFeatureActive() ? '
                    INNER JOIN `'._DB_PREFIX_.'category_group` cg
                    ON(cg.`id_category` = cp.`id_category`)' : '').'
                '.(Group::isGroupProductRestriction() ? '
                    AND EXISTS (
                        SELECT 1
                        FROM `'._DB_PREFIX_.'product_group` pg
                        WHERE (pg.`id_product` = p.`id_product`
                        AND pg.`id_group` IN ('.implode(',', $groups).'))
                    )' : '').'
                LEFT JOIN `'._DB_PREFIX_.'category_shop` cs
                    ON(cp.`id_category` = cs.`id_category`
                    AND cs.`id_shop` = '.(int)Context::getContext()->shop->id.')
                '.Product::sqlStock('p', 0).'
                WHERE (p.`reference` LIKE "%'.pSQL($expr).'%"
                    OR pa.`reference` LIKE "%'.pSQL($expr).'%")
                AND product_shop.`visibility` IN ("both", "search")
                '.(Configuration::get('PS_HIDE_OOS') ? '
                    AND stock.`quantity` > 0 ' : '').'
                '.(Combination::isFeatureActive() ? '
                    AND product_shop.`cache_default_attribute` = IFNULL(pa.`id_product_attribute`, 0)' : '').'
                '.$sql_groups.'
                AND product_shop.`active` = 1
                GROUP BY product_shop.`id_product`
                ORDER BY position DESC'.($order_by ? ', '.$alias.$order_by : '').($order_way ? ' '.$order_way : '').'
                LIMIT '.(int)(($page_number - 1) * $page_size).','.(int)$page_size
            , true, false);
            
            foreach($result as &$product) {
                if($product['id_product_attribute'] && $product['attribute_image']) {
                    $product['id_image'] = $product['attribute_image'];
                }
            }
        }
        else {
            $intersect_array = array();
            $score_array = array();
            $words = explode(' ', Search::sanitize($expr, $id_lang, false, $context->language->iso_code));

            foreach($words as $key => $word)
                if(!empty($word) 
                    && strlen($word) >= (int)Configuration::get('PS_SEARCH_MINWORDLEN')
                ) {
                    $word = str_replace('%', '\\%', $word);
                    $word = str_replace('_', '\\_', $word);
                    $intersect_array[] = '
                        SELECT si.`id_product`
                        FROM `'._DB_PREFIX_.'search_word` sw
                        LEFT JOIN `'._DB_PREFIX_.'search_index` si
                            ON(sw.`id_word` = si.`id_word`)
                        WHERE sw.`id_lang` = '.(int)$id_lang.'
                        AND sw.`id_shop` = '.$context->shop->id.'
                        AND sw.`word` LIKE
                        '.($word[0] == '-'
                            ? ' \''.pSQL(Tools::substr($word, 1, PS_SEARCH_MAX_WORD_LENGTH)).'%\''
                            : '\''.pSQL(Tools::substr($word, 0, PS_SEARCH_MAX_WORD_LENGTH)).'%\''
                        );

                    if($word[0] != '-')
                        $score_array[] = 'sw.`word` LIKE \''.pSQL(Tools::substr($word, 0, PS_SEARCH_MAX_WORD_LENGTH)).'%\'';
                }
                else
                    unset($words[$key]);

            if(!count($words)) {
                return ($ajax ? array() : array('total' => 0, 'result' => array()));
            }

            $score = '';
            if(is_array($score_array) && !empty($score_array)) {
                $score = ',(
                    SELECT SUM(`weight`)
                    FROM `'._DB_PREFIX_.'search_word` sw
                    LEFT JOIN `'._DB_PREFIX_.'search_index` si
                        ON(sw.`id_word` = si.`id_word`)
                    WHERE sw.`id_lang` = '.(int)$id_lang.'
                    AND sw.`id_shop` = '.$context->shop->id.'
                    AND si.`id_product` = p.`id_product`
                    AND ('.implode(' OR ', $score_array).')
                ) position';
            }

            $results = $db->executeS('
                SELECT DISTINCT cp.`id_product`
                FROM `'._DB_PREFIX_.'category_product` cp
                '.(Group::isFeatureActive() ? '
                    INNER JOIN `'._DB_PREFIX_.'category_group` cg
                        ON(cp.`id_category` = cg.`id_category`)' : '').'
                INNER JOIN `'._DB_PREFIX_.'category` c
                    ON(cp.`id_category` = c.`id_category`)
                INNER JOIN `'._DB_PREFIX_.'product` p
                    ON(cp.`id_product` = p.`id_product`)
                '.Shop::addSqlAssociation('product', 'p', false).'
                '.Product::sqlStock('p', 0).'
                WHERE c.`active` = 1
                '.(Configuration::get('PS_HIDE_OOS') ? '
                    AND stock.`quantity` > 0 ' : '').'
                '.(Group::isGroupProductRestriction() ? '
                    AND EXISTS (
                        SELECT 1
                        FROM `'._DB_PREFIX_.'product_group` pg
                        WHERE (pg.`id_product` = p.`id_product`
                        AND pg.`id_group` IN ('.implode(',', $groups).'))
                    )' : '').'
                AND product_shop.`active` = 1
                AND product_shop.`visibility` IN("both", "search")
                AND product_shop.`indexed` = 1
                '.$sql_groups
            , true, false);

            $eligible_products = array();
            foreach($results as $row) {
                $eligible_products[] = $row['id_product'];
            }
            foreach($intersect_array as $query) {
                $eligible_products2 = array();
                foreach($db->executeS($query) as $row) {
                    $eligible_products2[] = $row['id_product'];
                }
                $eligible_products = array_intersect($eligible_products, $eligible_products2);
                if(!count($eligible_products))
                    return ($ajax ? array() : array('total' => 0, 'result' => array()));
            }

            $total = 0;
            $product_pool = array();
            $eligible_products = array_unique($eligible_products);

            foreach($eligible_products as $id_product) {
                $total++;
                $product_pool[] = (int)$id_product;
            }
            if(empty($product_pool)) {
                return ($ajax ? array() : array('total' => 0, 'result' => array()));
            }

            if($ajax) {
                return $db->executeS('
                    SELECT DISTINCT p.`id_product`, pl.`name` pname, cl.`name` cname,
                        cl.`link_rewrite` crewrite, pl.`link_rewrite` prewrite '.$score.'
                        , i.`id_image`
                    FROM `'._DB_PREFIX_.'product` p
                    INNER JOIN `'._DB_PREFIX_.'product_lang` pl
                        ON(p.`id_product` = pl.`id_product`
                        AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').')
                    '.Shop::addSqlAssociation('product', 'p').'
                    LEFT JOIN `'._DB_PREFIX_.'image_shop` i
                        ON(i.`id_product` = p.`id_product`
                        AND i.`id_shop` = '.(int)Context::getContext()->shop->id.'
                        AND i.`cover` = 1
                        AND i.`id_lang` IN (0, '.(int)Context::getContext()->language->id.'))
                    INNER JOIN `'._DB_PREFIX_.'category_lang` cl
                        ON(product_shop.`id_category_default` = cl.`id_category`
                        AND cl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('cl').')
                    WHERE p.`id_product` IN('.implode(',', $product_pool).')
                    ORDER BY position DESC
                    LIMIT '.(int)Configuration::get('PS_SEARCH_AJAX_MAX')
                , true, false);
            }

            if(strpos($order_by, '.') > 0) {
                $order_by = explode('.', $order_by);
                $order_by = pSQL($order_by[0]).'.`'.pSQL($order_by[1]).'`';
            }
            $alias = '';
            if($order_by == 'price') {
                $alias = 'product_shop.';
            }
            elseif (in_array($order_by, array('date_upd', 'date_add'))) {
                $alias = 'p.';
            }
            $result = $db->executeS('
                SELECT p.*, product_shop.*, stock.`out_of_stock`, IFNULL(stock.`quantity`, 0) as quantity,
                    pl.`description_short`, pl.`available_now`, pl.`available_later`, pl.`link_rewrite`,
                    pl.`name`, MAX(i.`id_image`) id_image, il.`legend`, m.`name` manufacturer_name, pl.`catch_phrase`
                    '.$score.'
                    '.(Combination::isFeatureActive() ? ',
                    MAX(product_attribute_shop.`id_product_attribute`) id_product_attribute' : '').',
                    DATEDIFF(
                        p.`date_add`,
                        DATE_SUB(
                            "'.date('Y-m-d').' 00:00:00",
                            INTERVAL '._PS_NB_DAYS_NEW_PRODUCT_.' DAY
                        )
                    ) > 0 new'.(Combination::isFeatureActive() ? '
                        , product_attribute_shop.`minimal_quantity` AS product_attribute_minimal_quantity,
                        IFNULL(product_attribute_shop.`id_product_attribute`,0) id_product_attribute' : '').'
                FROM `'._DB_PREFIX_.'product` p
                '.Shop::addSqlAssociation('product', 'p').'
                INNER JOIN `'._DB_PREFIX_.'product_lang` pl
                    ON(p.`id_product` = pl.`id_product`
                    AND pl.`id_lang` = '.(int)$id_lang.Shop::addSqlRestrictionOnLang('pl').')
                '.(Combination::isFeatureActive() ? '
                    LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` product_attribute_shop
                        ON(p.`id_product` = product_attribute_shop.`id_product`
                        AND product_attribute_shop.`default_on` = 1
                        AND product_attribute_shop.`id_shop` = '.(int)$context->shop->id.')':'').'
                '.Product::sqlStock('p', 0).'
                LEFT JOIN `'._DB_PREFIX_.'manufacturer` m
                    ON(m.`id_manufacturer` = p.`id_manufacturer`)
                LEFT JOIN `'._DB_PREFIX_.'image_shop` i
                    ON(i.`id_product` = p.`id_product`
                    AND i.`cover` = 1
                    AND i.`id_shop` = '.(int)$context->shop->id.'
                    AND i.`id_lang` IN(0, '.(int)Context::getContext()->language->id.'))
                LEFT JOIN `'._DB_PREFIX_.'image_lang` il
                    ON(i.`id_image` = il.`id_image`
                    AND il.`id_lang` = '.(int)$id_lang.')
                WHERE p.`id_product` IN('.implode(',', $product_pool).')
                '.(Configuration::get('PS_HIDE_OOS') ? '
                    AND stock.`quantity` > 0 ' : '').'
                GROUP BY product_shop.`id_product`
                '.($order_by ? 'ORDER BY  '.$alias.$order_by : '').($order_way ? ' '.$order_way : '').'
                LIMIT '.(int)(($page_number - 1) * $page_size).','.(int)$page_size
            , true, false);
        }
        if($ajax) {
            return $result;
        }
        if(!$result) {
            $result_properties = false;
        }
        else {
            $result_properties = Product::getProductsProperties((int)$id_lang, $result);
            if(Configuration::get('PS_FORCE_OOS_TO_BOTTOM')) {
                $oos = array();
                foreach($result_properties as $key => $product) {
                    if(!$product['allow_oosp'] && ($product['quantity'] <= 0)) {
                        $oos[] = $product;
                        unset($result_properties[$key]);
                    }
                }
                if(!empty($oos[0])) {
                    $result_properties = array_merge($result_properties, $oos);
                }
                $from = ((int)$page_number - 1) * (int)$page_size;
                $result_properties = array_slice($result_properties, $from, (int)$page_size);
            }
        }

        return array('total' => $total,'result' => $result_properties);
    }

    /**
     * @param Db $db
     * @param int $id_product
     * @param int $id_lang
     * @return string
     */
    public static function getTags($db, $id_product, $id_lang)
    {
        $tags = array();
        $tagsArray = $db->executeS('
            SELECT t.`name`
            FROM `'._DB_PREFIX_.'product_tag` pt
            LEFT JOIN `'._DB_PREFIX_.'tag` t
                ON(pt.`id_tag` = t.`id_tag`
                AND t.`id_lang` = '.(int)$id_lang.')
            WHERE pt.`id_product` = '.(int)$id_product
        , true, false);

        foreach($tagsArray as $tag) {
            $tags[] = $tag['name'];
        }

        return $tags;
    }

    /**
     * @param Db $db
     * @param int $id_product
     * @param int $id_lang
     * @return string
     */
    public static function getAttributes($db, $id_product, $id_lang)
    {
        if(!Combination::isFeatureActive()) {
            return '';
        }

        $attributes = array();
        $attributesArray = $db->executeS('
            SELECT al.`name`
            FROM `'._DB_PREFIX_.'product_attribute` pa
            INNER JOIN `'._DB_PREFIX_.'product_attribute_combination` pac
                ON(pa.`id_product_attribute` = pac.`id_product_attribute`)
            INNER JOIN `'._DB_PREFIX_.'attribute_lang` al
                ON(pac.`id_attribute` = al.`id_attribute`
                AND al.`id_lang` = '.(int)$id_lang.')
            '.Shop::addSqlAssociation('product_attribute', 'pa').'
            WHERE pa.`id_product` = '.(int)$id_product
        , true, false);

        foreach($attributesArray as $attribute) {
            $attributes[] = $attribute['name'].' ';
        }

        return $attributes;
    }

    /**
     * @param Db $db
     * @param int $id_product
     * @param int $id_lang
     * @return string
     */
    public static function getFeatures($db, $id_product, $id_lang)
    {
        if(!Feature::isFeatureActive()) {
            return '';
        }

        $features = array();
        $featuresArray = $db->executeS('
            SELECT fvl.`value`
            FROM `'._DB_PREFIX_.'feature_product` fp
            INNER JOIN `'._DB_PREFIX_.'feature_value_lang` fvl
                ON(fp.`id_feature_value` = fvl.`id_feature_value`
                AND fvl.`id_lang` = '.(int)$id_lang.')
            WHERE fp.`id_product` = '.(int)$id_product
        , true, false );

        foreach($featuresArray as $feature) {
            $features[] = $feature['value'].' ';
        }

        return $features;
    }

    /**
     * @param $weight_array
     * @return string
     */
    protected static function getSQLProductAttributeFields(&$weight_array)
    {
        $sql = '';
        if(is_array($weight_array)) {
            foreach($weight_array as $key => $weight) {
                if((int)$weight) {
                    switch($key) {
                        case 'pa_reference':
                            $sql .= ', pa.`reference` AS pa_reference';
                        break;
                        case 'pa_supplier_reference':
                            $sql .= ', pa.`supplier_reference` AS pa_supplier_reference';
                        break;
                        case 'pa_ean13':
                            $sql .= ', pa.`ean13` AS pa_ean13';
                        break;
                        case 'pa_upc':
                            $sql .= ', pa.`upc` AS pa_upc';
                        break;
                        case 'pa_isbn':
                            $sql .= ', pa.`isbn` AS pa_isbn';
                        break;
                        case 'pa_gtin':
                            $sql .= ', pa.`gtin` AS pa_gtin';
                        break;
                    }
                }
            }
        }

        return $sql;
    }

    protected static function getProductsToIndex($total_languages, $id_product = false, $limit = 50, $weight_array = array())
    {
        $ids = null;
        if(!$id_product) {
            // Limit products for each step but be sure that each attribute is taken into account
            $res = Db::getInstance()->executeS('
                SELECT p.`id_product`
                FROM `'._DB_PREFIX_.'product` p
                '.Shop::addSqlAssociation('product', 'p', true, null, true).'
                WHERE product_shop.`indexed` = 0
                AND product_shop.`visibility` IN("both", "search")
                AND product_shop.`active` = 1
                ORDER BY product_shop.`id_product` ASC
                LIMIT '.(int)$limit
            , false);

            while($row = Db::getInstance()->nextRow($res)) {
                $ids[] = $row['id_product'];
            }
        }

        // Now get every attribute in every language
        $sql = 'SELECT p.id_product, pl.id_lang, pl.id_shop, l.iso_code';

        if(is_array($weight_array)) {
            foreach($weight_array as $key => $weight) {
                if((int)$weight) {
                    switch($key) {
                        case 'pname':
                            $sql .= ', pl.`name` pname';
                        break;
                        case 'reference':
                            $sql .= ', p.`reference`';
                        break;
                        case 'supplier_reference':
                            $sql .= ', p.`supplier_reference`';
                        break;
                        case 'ean13':
                            $sql .= ', p.`ean13`';
                        break;
                        case 'upc':
                            $sql .= ', p.`upc`';
                        break;
                        case 'isbn':
                            $sql .= ', p.`isbn`';
                        break;
                        case 'gtin':
                            $sql .= ', p.`gtin`';
                        break;
                        case 'description_short':
                            $sql .= ', pl.`description_short`';
                        break;
                        case 'description':
                            $sql .= ', pl.`description`';
                        break;
                        case 'cname':
                            $sql .= ', cl.`name` cname';
                        break;
                        case 'mname':
                            $sql .= ', m.`name` mname';
                        break;
                    }
                }
            }
        }

        $sql .= '
            FROM `'._DB_PREFIX_.'product` p
            INNER JOIN `'._DB_PREFIX_.'product_lang` pl
                ON(p.`id_product` = pl.`id_product`)
            '.Shop::addSqlAssociation('product', 'p', true, null, true).'
            INNER JOIN `'._DB_PREFIX_.'category_lang` cl
                ON(cl.`id_category` = product_shop.`id_category_default`
                AND pl.`id_lang` = cl.`id_lang`
                AND cl.`id_shop` = product_shop.`id_shop`)
            LEFT JOIN `'._DB_PREFIX_.'manufacturer` m
                ON(m.`id_manufacturer` = p.`id_manufacturer`)
            INNER JOIN `'._DB_PREFIX_.'lang` l
                ON(l.`id_lang` = pl.`id_lang`)
            WHERE product_shop.`indexed` = 0
            AND product_shop.`visibility` IN("both", "search")
            '.($id_product ? '
                AND p.`id_product` = '.(int)$id_product : '').'
            '.($ids ? '
                AND p.`id_product` IN('.implode(',', array_map('intval', $ids)).')' : '').'
            AND product_shop.`active` = 1
            AND pl.`id_shop` = product_shop.`id_shop`';

        return Db::getInstance()->executeS($sql, true, false);
    }

    /**
     * @param Db     $db
     * @param int    $id_product
     * @param string $sql_attribute
     *
     * @return array|null
     */
    protected static function getAttributesFields($db, $id_product, $sql_attribute)
    {
        return $db->executeS('
            SELECT pa.`id_product` '.$sql_attribute.'
            FROM `'._DB_PREFIX_.'product_attribute` pa
            INNER JOIN `'._DB_PREFIX_.'product_attribute_shop` pas
                ON(pa.`id_product_attribute` = pas.`id_product_attribute`
                AND pas.`visible` = 1
                AND pas.`id_shop` = '.(int)Context::getContext()->shop->id.')
            WHERE pa.`id_product` = '.(int)$id_product
        , true, false);
    }

    /**
     * @param $product_array
     * @param $weight_array
     * @param $key
     * @param $value
     * @param $id_lang
     * @param $iso_code
     */
    protected static function fillProductArray(&$product_array, $weight_array, $key, $value, $id_lang, $iso_code)
    {
        $min_length = (int)Configuration::get('PS_SEARCH_MINWORDLEN');
        if(!empty($value)) {
            if(strncmp($key, 'id_', 3) && isset($weight_array[$key])) {
                if(in_array($key, array('description', 'description_short', 'cname', 'pname'))) {
                    $words = explode(' ', Search::sanitize($value, (int)$id_lang, true, $iso_code));
                }
                elseif(in_array($key, array('tags', 'attributes', 'features'))) {
                    $words = $value;
                }
                else {
                    $w = trim($value);
                    $w = preg_replace('!\s+!',' ',$w);
                    $w = trim(substr($w,0,32));
                    if($key == 'attributes') {
                        $words = explode(' ', $w);
                    }
                    else {
                        $words = array($w);
                    }
                }
                foreach($words as $word) {
                    $word = trim($word);
                    if(!empty($word)) {
                        if(strlen($word) < $min_length) {
                            continue;
                        }
                        $word = Tools::substr($word, 0, PS_SEARCH_MAX_WORD_LENGTH);
                        if(!isset($product_array[$word])) {
                            $product_array[$word] = 0;
                        }
                        $product_array[$word] += $weight_array[$key];
                    }
                }
            }
        }
    }

    public static function indexation($full = false, $id_product = false)
    {
        $db = Db::getInstance();

        if($id_product) {
            $full = false;
        }

        if($full && Context::getContext()->shop->getContext() == Shop::CONTEXT_SHOP) {
            $db->execute('
                DELETE si, sw
                FROM `'._DB_PREFIX_.'search_index` si
                INNER JOIN `'._DB_PREFIX_.'product` p
                    ON(p.`id_product` = si.`id_product`)
                '.Shop::addSqlAssociation('product', 'p').'
                INNER JOIN `'._DB_PREFIX_.'search_word` sw
                    ON(sw.`id_word` = si.`id_word`
                    AND product_shop.`id_shop` = sw.`id_shop`)
                WHERE product_shop.`visibility` IN("both", "search")
                AND product_shop.`active` = 1
            ') &&
            $db->execute('
                UPDATE `'._DB_PREFIX_.'product` p
                '.Shop::addSqlAssociation('product', 'p').'
                SET p.`indexed` = 0,
                    product_shop.`indexed` = 0
                WHERE product_shop.`visibility` IN("both", "search")
                AND product_shop.`active` = 1
            ');
        }
        elseif($full) {
            $db->execute('TRUNCATE '._DB_PREFIX_.'search_index');
            $db->execute('TRUNCATE '._DB_PREFIX_.'search_word');
            ObjectModel::updateMultishopTable('Product', array('indexed' => 0));
        }
        else {
            $db->execute('
                DELETE si 
                FROM `'._DB_PREFIX_.'search_index` si
                INNER JOIN `'._DB_PREFIX_.'product` p
                    ON(p.`id_product` = si.`id_product`)
                '.Shop::addSqlAssociation('product', 'p').'
                INNER JOIN `'._DB_PREFIX_.'search_word` sw
                    ON(sw.`id_word` = si.`id_word`
                    AND product_shop.`id_shop` = sw.`id_shop`)
                WHERE product_shop.`visibility` IN("both", "search")
                AND product_shop.`active` = 1
                AND '.($id_product ? 'p.`id_product` = '.(int)$id_product : 'product_shop.`indexed` = 0')
            ) &&
            $db->execute('
                UPDATE `'._DB_PREFIX_.'product` p
                '.Shop::addSqlAssociation('product', 'p').'
                SET p.`indexed` = 0,
                    product_shop.`indexed` = 0
                WHERE product_shop.`visibility` IN("both", "search")
                AND product_shop.`active` = 1
                AND '.($id_product ? 'p.`id_product` = '.(int)$id_product : 'product_shop.`indexed` = 0')
            );
        }

        // Every fields are weighted according to the configuration in the backend
        $weight_array = array(
            'pname'                 => Configuration::get('PS_SEARCH_WEIGHT_PNAME'),
            'reference'             => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'pa_reference'          => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'supplier_reference'    => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'pa_supplier_reference' => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'ean13'                 => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'pa_ean13'              => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'upc'                   => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'pa_upc'                => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'isbn'                  => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'pa_isbn'               => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'gtin'                  => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'pa_gtin'               => Configuration::get('PS_SEARCH_WEIGHT_REF'),
            'description_short'     => Configuration::get('PS_SEARCH_WEIGHT_SHORTDESC'),
            'description'           => Configuration::get('PS_SEARCH_WEIGHT_DESC'),
            'cname'                 => Configuration::get('PS_SEARCH_WEIGHT_CNAME'),
            'mname'                 => Configuration::get('PS_SEARCH_WEIGHT_MNAME'),
            'tags'                  => Configuration::get('PS_SEARCH_WEIGHT_TAG'),
            'attributes'            => Configuration::get('PS_SEARCH_WEIGHT_ATTRIBUTE'),
            'features'              => Configuration::get('PS_SEARCH_WEIGHT_FEATURE')
        );

        // Those are kind of global variables required to save the processed data
        // in the database every X occurrences, in order to avoid overloading MySQL
        $count_words = 0;
        $query_array3 = array();

        // Retrieve the number of languages
        $total_languages = count(Language::getIDs(true));
        $sql_attribute = Search::getSQLProductAttributeFields($weight_array);
        // Products are processed 50 by 50 in order to avoid overloading MySQL
        while(($products = Search::getProductsToIndex($total_languages, $id_product, 50, $weight_array))
            && (count($products) > 0)
        ) {
            $products_array = array();
            // Now each non-indexed product is processed one by one, langage by langage
            foreach($products as $product) {
                if((int)$weight_array['tags']) {
                    $product['tags'] = Search::getTags(
                        $db,
                        (int)$product['id_product'],
                        (int)$product['id_lang']
                    );
                }
                if((int)$weight_array['attributes']) {
                    $product['attributes'] = Search::getAttributes(
                        $db,
                        (int)$product['id_product'],
                        (int)$product['id_lang']
                    );
                }
                if((int)$weight_array['features']) {
                    $product['features'] = Search::getFeatures(
                        $db,
                        (int)$product['id_product'],
                        (int)$product['id_lang']
                    );
                }
                if($sql_attribute) {
                    $attribute_fields = Search::getAttributesFields(
                        $db,
                        (int)$product['id_product'],
                        $sql_attribute
                    );
                    if($attribute_fields) {
                        $product['attributes_fields'] = $attribute_fields;
                    }
                }
                // Data must be cleaned of html, bad characters, spaces and anything,
                // then if the resulting words are long enough, they're added to the array
                $product_array = array();
                foreach($product as $key => $value) {
                    if($key == 'attributes_fields') {
                        foreach ($value as $pa_array) {
                            foreach ($pa_array as $pa_key => $pa_value) {
                                Search::fillProductArray(
                                    $product_array,
                                    $weight_array,
                                    $pa_key,
                                    $pa_value,
                                    $product['id_lang'],
                                    $product['iso_code']
                                );
                            }
                        }
                    }
                    else {
                        Search::fillProductArray(
                            $product_array,
                            $weight_array,
                            $key,
                            $value,
                            $product['id_lang'],
                            $product['iso_code']
                        );
                    }
                }

                // If we find words that need to be indexed,
                // they're added to the word table in the database
                if(is_array($product_array) && !empty($product_array)) {
                    $query_array = $query_array2 = array();
                    foreach($product_array as $word => $weight) {
                        if($weight) {
                            $query_array[$word] = '('.(int)$product['id_lang'].', '.(int)$product['id_shop'].', \''.pSQL($word).'\')';
                            $query_array2[] = '\''.pSQL($word).'\'';
                        }
                    }

                    if(is_array($query_array) && !empty($query_array)) {
                        // The words are inserted...
                        $db->execute('
                            INSERT IGNORE INTO `'._DB_PREFIX_.'search_word`
                                (`id_lang`, `id_shop`, `word`)
                            VALUES '.implode(',', $query_array)
                        , false);
                    }
                    $word_ids_by_word = array();
                    if(is_array($query_array2) && !empty($query_array2)) {
                        // ...then their IDs are retrieved
                        $added_words = $db->executeS('
                            SELECT sw.`id_word`, sw.`word`
                            FROM `'._DB_PREFIX_.'search_word` sw
                            WHERE sw.`word` IN('.implode(',', $query_array2).')
                            AND sw.`id_lang` = '.(int)$product['id_lang'].'
                            AND sw.`id_shop` = '.(int)$product['id_shop']
                        , true, false);

                        foreach ($added_words as $word_id) {
                            $word_ids_by_word['_'.$word_id['word']] = (int)$word_id['id_word'];
                        }
                    }
                }

                foreach($product_array as $word => $weight) {
                    if(!$weight) {
                        continue;
                    }
                    if(!isset($word_ids_by_word['_'.$word])) {
                        continue;
                    }
                    $id_word = $word_ids_by_word['_'.$word];
                    if(!$id_word) {
                        continue;
                    }
                    $query_array3[] = '('.(int)$product['id_product'].','.
                        (int)$id_word.','.(int)$weight.')';
                    // Force save every 200 words in order to avoid overloading MySQL
                    if(++$count_words % 200 == 0) {
                        Search::saveIndex($query_array3);
                    }
                }

                $products_array[] = (int)$product['id_product'];
            }
            $products_array = array_unique($products_array);
            Search::setProductsAsIndexed($products_array);

            // One last save is done at the end in order to save what's left
            Search::saveIndex($query_array3);
        }
        return true;
    }

    public static function removeProductsSearchIndex($products)
    {
        if(is_array($products) && !empty($products)) {
            Db::getInstance()->execute('
                DELETE
                FROM `'._DB_PREFIX_.'search_index`
                WHERE `id_product` IN('.implode(',', array_map('intval', $products)).')
            ');
            ObjectModel::updateMultishopTable(
                'Product',
                array('indexed' => 0),
                'a.`id_product` IN('.implode(',', array_map('intval', $products)).')'
            );
        }
    }

    protected static function setProductsAsIndexed(&$products)
    {
        if(is_array($products) && !empty($products)) {
            ObjectModel::updateMultishopTable(
                'Product',
                array('indexed' => 1),
                'a.`id_product` IN('.implode(',', $products).')'
            );
        }
    }

    /** 
     * $queryArray3 is automatically emptied in order to be reused immediatly
     */
    protected static function saveIndex(&$queryArray3)
    {
        if(is_array($queryArray3) && !empty($queryArray3)) {
            Db::getInstance()->execute('
                INSERT INTO `'._DB_PREFIX_.'search_index`
                    (`id_product`, `id_word`, `weight`)
                VALUES '.implode(',', $queryArray3).'
                ON DUPLICATE KEY UPDATE
                    `weight` = `weight` + VALUES(`weight`)
            ', false);
        }
        $queryArray3 = array();
    }

    public static function searchTag($id_lang, $tag, $count = false, $pageNumber = 0, $pageSize = 10,
        $orderBy = false, $orderWay = false, $useCookie = true, Context $context = null) {

        if(!$context) {
            $context = Context::getContext();
        }

        // Only use cookie if id_customer is not present
        if($useCookie) {
            $id_customer = (int)$context->customer->id;
        }
        else {
            $id_customer = 0;
        }

        if(!is_numeric($pageNumber)
            || !is_numeric($pageSize)
            || !Validate::isBool($count)
            || !Validate::isValidSearch($tag)
            || $orderBy && !$orderWay
            || ($orderBy && !Validate::isOrderBy($orderBy))
            || ($orderWay && !Validate::isOrderBy($orderWay))
        ) {
            return false;
        }

        if($pageNumber < 1) {
            $pageNumber = 1;
        }
        if($pageSize < 1) {
            $pageSize = 10;
        }

        $id = Context::getContext()->shop->id;
        $id_shop = $id ? $id : Configuration::get('PS_SHOP_DEFAULT');

        $sql_groups = '';
        if (Group::isFeatureActive()) {
            $groups = FrontController::getCurrentCustomerGroups();
            empty($groups) && ($groups = array((int)Configuration::get('PS_UNIDENTIFIED_GROUP')));
            $sql_groups = 'AND cg.`id_group` IN ('.implode(',', $groups).')';
        }

        if($count) {
            return (int)Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
                SELECT COUNT(DISTINCT pt.`id_product`) nb
                FROM `'._DB_PREFIX_.'tag` t
                STRAIGHT_JOIN `'._DB_PREFIX_.'product_tag` pt
                    ON(pt.`id_tag` = t.`id_tag`
                    AND t.`id_lang` = '.(int)$id_lang.')
                STRAIGHT_JOIN `'._DB_PREFIX_.'product` p
                    ON(p.`id_product` = pt.`id_product`)
                '.Shop::addSqlAssociation('product', 'p').'
                '.Product::sqlStock('p', 0).'
                INNER JOIN `'._DB_PREFIX_.'category_product` cp
                    ON(cp.`id_product` = p.`id_product`)
                INNER JOIN `'._DB_PREFIX_.'category_shop` cs
                    ON(cp.`id_category` = cs.`id_category`
                    AND cs.`id_shop` = '.(int)$id_shop.')
                '.(Group::isFeatureActive() ? '
                    INNER JOIN `'._DB_PREFIX_.'category_group` cg
                        ON(cg.`id_category` = cp.`id_category`)' : '').'
                '.(Group::isGroupProductRestriction() ? '
                    AND EXISTS (
                        SELECT 1
                        FROM `'._DB_PREFIX_.'product_group` pg
                        WHERE (pg.`id_product` = p.`id_product`
                        AND pg.`id_group` IN ('.implode(',', $groups).'))
                    )' : '').'
                WHERE product_shop.`active` = 1
                '.(Configuration::get('PS_HIDE_OOS') ? '
                    AND stock.`quantity` > 0 ' : '').'
                AND p.`visibility` IN (\'both\', \'search\')
                AND cs.`id_shop` = '.(int)Context::getContext()->shop->id.'
                '.$sql_groups.'
                AND t.`name` LIKE \'%'.pSQL($tag).'%\'
            ');
        }

        $sql = '
        SELECT DISTINCT p.*, product_shop.*, stock.`out_of_stock`,
            IFNULL(stock.`quantity`, 0) as quantity, pl.`description_short`, pl.`catch_phrase`,
            pl.`link_rewrite`, pl.`name`, pl.`available_now`, pl.`available_later`,
            MAX(i.`id_image`) id_image, il.`legend`, m.`name` manufacturer_name, 1 position,
            DATEDIFF(
                p.`date_add`,
                DATE_SUB(
                    "'.date('Y-m-d').' 00:00:00",
                    INTERVAL '._PS_NB_DAYS_NEW_PRODUCT_.' DAY
                )
            ) > 0 new
        FROM `'._DB_PREFIX_.'tag` t
        STRAIGHT_JOIN `'._DB_PREFIX_.'product_tag` pt
            ON(pt.`id_tag` = t.`id_tag`
            AND t.`id_lang` = '.(int)$id_lang.')
        STRAIGHT_JOIN `'._DB_PREFIX_.'product` p
            ON(p.`id_product` = pt.`id_product`)
        INNER JOIN `'._DB_PREFIX_.'product_lang` pl
            ON(p.`id_product` = pl.`id_product`
            AND pl.`id_lang` = '.(int)$id_lang
            .Shop::addSqlRestrictionOnLang('pl').')
        '.Shop::addSqlAssociation('product', 'p', false).'
        LEFT JOIN `'._DB_PREFIX_.'product_attribute_shop` product_attribute_shop
            ON(p.`id_product` = product_attribute_shop.`id_product`
            AND product_attribute_shop.`default_on` = 1
            AND product_attribute_shop.`id_shop` = '.(int)$context->shop->id.')
        INNER JOIN `'._DB_PREFIX_.'image_shop` i
            ON(i.`id_product` = p.`id_product`
            AND i.`cover` = 1
            AND i.`id_shop` = '.(int)$context->shop->id.')
        LEFT JOIN `'._DB_PREFIX_.'image_lang` il
            ON(i.`id_image` = il.`id_image`
            AND il.`id_lang` = '.(int)$id_lang.')
        LEFT JOIN `'._DB_PREFIX_.'manufacturer` m
            ON(m.`id_manufacturer` = p.`id_manufacturer`)
        INNER JOIN `'._DB_PREFIX_.'category_product` cp
            ON(cp.`id_product` = p.`id_product`)
        '.(Group::isFeatureActive() ? '
            INNER JOIN `'._DB_PREFIX_.'category_group` cg
                ON(cg.`id_category` = cp.`id_category`)' : '').'
        '.(Group::isGroupProductRestriction() ? '
            AND EXISTS (
                SELECT 1
                FROM `'._DB_PREFIX_.'product_group` pg
                WHERE (pg.`id_product` = p.`id_product`
                AND pg.`id_group` IN ('.implode(',', $groups).'))
            )' : '').'
        INNER JOIN `'._DB_PREFIX_.'category_shop` cs
            ON(cp.`id_category` = cs.`id_category`
            AND cs.`id_shop` = '.(int)$id_shop.')
        '.Product::sqlStock('p', 0).'
        WHERE product_shop.`active` = 1
        '.(Configuration::get('PS_HIDE_OOS') ? '
            AND stock.`quantity` > 0 ' : '').'
        AND cs.`id_shop` = '.(int)Context::getContext()->shop->id.'
        '.$sql_groups.'
        AND t.`name` LIKE \'%'.pSQL($tag).'%\'
        GROUP BY product_shop.id_product
        ORDER BY position DESC'.($orderBy ? ', '.$orderBy : '').($orderWay ? ' '.$orderWay : '').'
        LIMIT '.(int)(($pageNumber - 1) * $pageSize).','.(int)$pageSize;
        if (!$result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($sql, true, false)) {
            return false;
        }

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