admin/model/catalog/filter.php

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<?php
class ModelCatalogFilter extends Model {
	public function addFilter($data) {
		$this->db->query("INSERT INTO `" . DB_PREFIX . "filter_group` SET sort_order = '" . (int)$data['sort_order'] . "'");

		$filter_group_id = $this->db->getLastId();

		foreach ($data['filter_group_description'] as $language_id => $value) {
			$this->db->query("INSERT INTO " . DB_PREFIX . "filter_group_description SET filter_group_id = '" . (int)$filter_group_id . "', language_id = '" . (int)$language_id . "', name = '" . $this->db->escape($value['name']) . "'");
		}

		if (isset($data['filter'])) {
			foreach ($data['filter'] as $filter) {
				$this->db->query("INSERT INTO " . DB_PREFIX . "filter SET filter_group_id = '" . (int)$filter_group_id . "', sort_order = '" . (int)$filter['sort_order'] . "'");

				$filter_id = $this->db->getLastId();

				foreach ($filter['filter_description'] as $language_id => $filter_description) {
					$this->db->query("INSERT INTO " . DB_PREFIX . "filter_description SET filter_id = '" . (int)$filter_id . "', language_id = '" . (int)$language_id . "', filter_group_id = '" . (int)$filter_group_id . "', name = '" . $this->db->escape($filter_description['name']) . "'");
				}
			}
		}

		return $filter_group_id;
	}

	public function editFilter($filter_group_id, $data) {
		$this->db->query("UPDATE `" . DB_PREFIX . "filter_group` SET sort_order = '" . (int)$data['sort_order'] . "' WHERE filter_group_id = '" . (int)$filter_group_id . "'");

		$this->db->query("DELETE FROM " . DB_PREFIX . "filter_group_description WHERE filter_group_id = '" . (int)$filter_group_id . "'");

		foreach ($data['filter_group_description'] as $language_id => $value) {
			$this->db->query("INSERT INTO " . DB_PREFIX . "filter_group_description SET filter_group_id = '" . (int)$filter_group_id . "', language_id = '" . (int)$language_id . "', name = '" . $this->db->escape($value['name']) . "'");
		}

		$this->db->query("DELETE FROM " . DB_PREFIX . "filter WHERE filter_group_id = '" . (int)$filter_group_id . "'");
		$this->db->query("DELETE FROM " . DB_PREFIX . "filter_description WHERE filter_group_id = '" . (int)$filter_group_id . "'");

		if (isset($data['filter'])) {
			foreach ($data['filter'] as $filter) {
				if ($filter['filter_id']) {
					$this->db->query("INSERT INTO " . DB_PREFIX . "filter SET filter_id = '" . (int)$filter['filter_id'] . "', filter_group_id = '" . (int)$filter_group_id . "', sort_order = '" . (int)$filter['sort_order'] . "'");
				} else {
					$this->db->query("INSERT INTO " . DB_PREFIX . "filter SET filter_group_id = '" . (int)$filter_group_id . "', sort_order = '" . (int)$filter['sort_order'] . "'");
				}

				$filter_id = $this->db->getLastId();

				foreach ($filter['filter_description'] as $language_id => $filter_description) {
					$this->db->query("INSERT INTO " . DB_PREFIX . "filter_description SET filter_id = '" . (int)$filter_id . "', language_id = '" . (int)$language_id . "', filter_group_id = '" . (int)$filter_group_id . "', name = '" . $this->db->escape($filter_description['name']) . "'");
				}
			}
		}
	}

	public function deleteFilter($filter_group_id) {
		$this->db->query("DELETE FROM `" . DB_PREFIX . "filter_group` WHERE filter_group_id = '" . (int)$filter_group_id . "'");
		$this->db->query("DELETE FROM `" . DB_PREFIX . "filter_group_description` WHERE filter_group_id = '" . (int)$filter_group_id . "'");
		$this->db->query("DELETE FROM `" . DB_PREFIX . "filter` WHERE filter_group_id = '" . (int)$filter_group_id . "'");
		$this->db->query("DELETE FROM `" . DB_PREFIX . "filter_description` WHERE filter_group_id = '" . (int)$filter_group_id . "'");