<?php

class CategoryBC
{
    public static function hasChildren($id_parent, $id_lang, $active = true, $id_shop = false)
    {
        if (!Validate::isBool($active)) {
            die(Tools::displayError());
        }

        $cache_id = 'Category::hasChildren_'.(int)$id_parent.'-'.(int)$id_lang.'-'.(bool)$active.'-'.(int)$id_shop;
        if (!Cache::isStored($cache_id)) {
            $query = 'SELECT c.id_category, "" as name
			FROM `'._DB_PREFIX_.'category` c
			LEFT JOIN `'._DB_PREFIX_.'category_lang` cl ON (c.`id_category` = cl.`id_category`'.Shop::addSqlRestrictionOnLang('cl').')
			'.Shop::addSqlAssociation('category', 'c').'
			WHERE `id_lang` = '.(int)$id_lang.'
			AND c.`id_parent` = '.(int)$id_parent.'
			'.($active ? 'AND `active` = 1' : '').' LIMIT 1';
            $result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($query);
            Cache::store($cache_id, $result);
            return $result;
        }
        return Cache::retrieve($cache_id);
    }

    public static function getNestedCategories($root_category = null, $id_lang = false, $active = true, $groups = null,
                                               $use_shop_restriction = true, $sql_filter = '', $sql_sort = '', $sql_limit = '')
    {
        if (isset($root_category) && !Validate::isInt($root_category)) {
            die(Tools::displayError());
        }

        if (!Validate::isBool($active)) {
            die(Tools::displayError());
        }

        if (isset($groups) && Group::isFeatureActive() && !is_array($groups)) {
            $groups = (array)$groups;
        }

        $cache_id = 'Category::getNestedCategories_'.md5((int)$root_category.(int)$id_lang.(int)$active.(int)$use_shop_restriction
                .(isset($groups) && Group::isFeatureActive() ? implode('', $groups) : ''));

        if (!Cache::isStored($cache_id)) {
            $result = Db::getInstance()->executeS('
				SELECT c.*, cl.*
				FROM `'._DB_PREFIX_.'category` c
				'.($use_shop_restriction ? Shop::addSqlAssociation('category', 'c') : '').'
				LEFT JOIN `'._DB_PREFIX_.'category_lang` cl ON c.`id_category` = cl.`id_category`'.Shop::addSqlRestrictionOnLang('cl').'
				'.(isset($groups) && Group::isFeatureActive() ? 'LEFT JOIN `'._DB_PREFIX_.'category_group` cg ON c.`id_category` = cg.`id_category`' : '').'
				'.(isset($root_category) ? 'RIGHT JOIN `'._DB_PREFIX_.'category` c2 ON c2.`id_category` = '.(int)$root_category.' AND c.`nleft` >= c2.`nleft` AND c.`nright` <= c2.`nright`' : '').'
				WHERE 1 '.$sql_filter.' '.($id_lang ? 'AND `id_lang` = '.(int)$id_lang : '').'
				'.($active ? ' AND c.`active` = 1' : '').'
				'.(isset($groups) && Group::isFeatureActive() ? ' AND cg.`id_group` IN ('.implode(',', $groups).')' : '').'
				'.(!$id_lang || (isset($groups) && Group::isFeatureActive()) ? ' GROUP BY c.`id_category`' : '').'
				'.($sql_sort != '' ? $sql_sort : ' ORDER BY c.`level_depth` ASC').'
				'.($sql_sort == '' && $use_shop_restriction ? ', category_shop.`position` ASC' : '').'
				'.($sql_limit != '' ? $sql_limit : '')
            );

            $categories = array();
            $buff = array();

            if (!isset($root_category)) {
                $root_category = Category::getRootCategory()->id;
            }

            foreach ($result as $row) {
                $current = &$buff[$row['id_category']];
                $current = $row;

                if ($row['id_category'] == $root_category) {
                    $categories[$row['id_category']] = &$current;
                } else {
                    $buff[$row['id_parent']]['children'][$row['id_category']] = &$current;
                }
            }

            Cache::store($cache_id, $categories);
        } else {
            $categories = Cache::retrieve($cache_id);
        }

        return $categories;
    }

    public static function getAllCategoriesName($root_category = null, $id_lang = false, $active = true, $groups = null,
                                                $use_shop_restriction = true, $sql_filter = '', $sql_sort = '', $sql_limit = '')
    {
        if (isset($root_category) && !Validate::isInt($root_category)) {
            die(Tools::displayError());
        }

        if (!Validate::isBool($active)) {
            die(Tools::displayError());
        }

        if (isset($groups) && Group::isFeatureActive() && !is_array($groups)) {
            $groups = (array)$groups;
        }

        $cache_id = 'Category::getAllCategoriesName_'.md5((int)$root_category.(int)$id_lang.(int)$active.(int)$use_shop_restriction
                .(isset($groups) && Group::isFeatureActive() ? implode('', $groups) : ''));

        if (!Cache::isStored($cache_id)) {
            $result = Db::getInstance()->executeS('
				SELECT c.id_category, cl.name
				FROM `'._DB_PREFIX_.'category` c
				'.($use_shop_restriction ? Shop::addSqlAssociation('category', 'c') : '').'
				LEFT JOIN `'._DB_PREFIX_.'category_lang` cl ON c.`id_category` = cl.`id_category`'.Shop::addSqlRestrictionOnLang('cl').'
				'.(isset($groups) && Group::isFeatureActive() ? 'LEFT JOIN `'._DB_PREFIX_.'category_group` cg ON c.`id_category` = cg.`id_category`' : '').'
				'.(isset($root_category) ? 'RIGHT JOIN `'._DB_PREFIX_.'category` c2 ON c2.`id_category` = '.(int)$root_category.' AND c.`nleft` >= c2.`nleft` AND c.`nright` <= c2.`nright`' : '').'
				WHERE 1 '.$sql_filter.' '.($id_lang ? 'AND `id_lang` = '.(int)$id_lang : '').'
				'.($active ? ' AND c.`active` = 1' : '').'
				'.(isset($groups) && Group::isFeatureActive() ? ' AND cg.`id_group` IN ('.implode(',', $groups).')' : '').'
				'.(!$id_lang || (isset($groups) && Group::isFeatureActive()) ? ' GROUP BY c.`id_category`' : '').'
				'.($sql_sort != '' ? $sql_sort : ' ORDER BY c.`level_depth` ASC').'
				'.($sql_sort == '' && $use_shop_restriction ? ', category_shop.`position` ASC' : '').'
				'.($sql_limit != '' ? $sql_limit : '')
            );

            Cache::store($cache_id, $result);
        } else {
            $result = Cache::retrieve($cache_id);
        }

        return $result;
    }
}