halfhope

public function getProducts($data = array()) {
	if ($this->customer->isLogged()) {
		$customer_group_id = $this->customer->getCustomerGroupId();
	} else {
		$customer_group_id = $this->config->get('config_customer_group_id');
	}	

	$sql = "SELECT p.product_id, (SELECT AVG(rating) AS total FROM " . DB_PREFIX . "review r1 WHERE r1.product_id = p.product_id AND r1.status = '1' GROUP BY r1.product_id) AS rating, (SELECT price FROM " . DB_PREFIX . "product_discount pd2 WHERE pd2.product_id = p.product_id AND pd2.customer_group_id = '" . (int)$customer_group_id . "' AND pd2.quantity = '1' AND ((pd2.date_start = '0000-00-00' OR pd2.date_start < NOW()) AND (pd2.date_end = '0000-00-00' OR pd2.date_end > NOW())) ORDER BY pd2.priority ASC, pd2.price ASC LIMIT 1) AS discount, (SELECT price FROM " . DB_PREFIX . "product_special ps WHERE ps.product_id = p.product_id AND ps.customer_group_id = '" . (int)$customer_group_id . "' AND ((ps.date_start = '0000-00-00' OR ps.date_start < NOW()) AND (ps.date_end = '0000-00-00' OR ps.date_end > NOW())) ORDER BY ps.priority ASC, ps.price ASC LIMIT 1) AS special"; 

	if (!empty($data['filter_category_id'])) {
		if (!empty($data['filter_sub_category'])) {
			$sql .= " FROM " . DB_PREFIX . "category_path cp LEFT JOIN " . DB_PREFIX . "product_to_category p2c ON (cp.category_id = p2c.category_id)";			
		} else {
			$sql .= " FROM " . DB_PREFIX . "product_to_category p2c";
		}

		if (!empty($data['filter_filter'])) {
			$sql .= " LEFT JOIN " . DB_PREFIX . "product_filter pf ON (p2c.product_id = pf.product_id) LEFT JOIN " . DB_PREFIX . "product p ON (pf.product_id = p.product_id)";
		} else {
			$sql .= " LEFT JOIN " . DB_PREFIX . "product p ON (p2c.product_id = p.product_id)";
		}
	} else {
		$sql .= " FROM " . DB_PREFIX . "product p";
	}

	$sql .= " LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) LEFT JOIN " . DB_PREFIX . "product_to_store p2s ON (p.product_id = p2s.product_id) WHERE pd.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p.status = '1' AND p.date_available <= NOW() AND p2s.store_id = '" . (int)$this->config->get('config_store_id') . "'";

	if (!empty($data['filter_category_id'])) {
		if (!empty($data['filter_sub_category'])) {
			$sql .= " AND cp.path_id = '" . (int)$data['filter_category_id'] . "'";	
		} else {
			$sql .= " AND p2c.category_id = '" . (int)$data['filter_category_id'] . "'";			
		}	

		if (!empty($data['filter_filter'])) {
			$implode = array();

			$filters = explode(',', $data['filter_filter']);

			foreach ($filters as $filter_id) {
				$implode[] = (int)$filter_id;
			}

			$sql .= " AND pf.filter_id IN (" . implode(',', $implode) . ")";				
		}
	}	

	if (!empty($data['filter_name']) || !empty($data['filter_tag'])) {
		$sql .= " AND (";

		if (!empty($data['filter_name'])) {
			$implode = array();

			$words = explode(' ', trim(preg_replace('/\s\s+/', ' ', $data['filter_name'])));

			foreach ($words as $word) {
				$implode[] = "pd.name LIKE '%" . $this->db->escape($word) . "%'";
			}

			if ($implode) {
				$sql .= " " . implode(" AND ", $implode) . "";
			}

			if (!empty($data['filter_description'])) {
				$sql .= " OR pd.description LIKE '%" . $this->db->escape($data['filter_name']) . "%'";
			}
		}

		if (!empty($data['filter_name']) && !empty($data['filter_tag'])) {
			$sql .= " OR ";
		}

		if (!empty($data['filter_tag'])) {
			$sql .= "pd.tag LIKE '%" . $this->db->escape($data['filter_tag']) . "%'";
		}

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.model) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.sku) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}	

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.upc) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}		

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.ean) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.jan) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.isbn) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}		

		if (!empty($data['filter_name'])) {
			$sql .= " OR LCASE(p.mpn) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
		}

		$sql .= ")";
	}

	if (!empty($data['filter_manufacturer_id'])) {
		$sql .= " AND p.manufacturer_id = '" . (int)$data['filter_manufacturer_id'] . "'";
	}

	$sql .= " GROUP BY p.product_id";

	$sort_data = array(
		'pd.name',
		'p.model',
		'p.quantity',
		'p.price',
		'rating',
		'p.sort_order',
		'p.date_added'
	);	

	if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
		if ($data['sort'] == 'pd.name' || $data['sort'] == 'p.model') {
			$sql .= " ORDER BY LCASE(" . $data['sort'] . ")";
		} elseif ($data['sort'] == 'p.price') {
			$sql .= " ORDER BY (CASE WHEN special IS NOT NULL THEN special WHEN discount IS NOT NULL THEN discount ELSE p.price END)";
		} else {
			$sql .= " ORDER BY " . $data['sort'];
		}
	} else {
		$sql .= " ORDER BY p.sort_order";	
	}

	if (isset($data['order']) && ($data['order'] == 'DESC')) {
		$sql .= " DESC, LCASE(pd.name) DESC";
	} else {
		$sql .= " ASC, LCASE(pd.name) ASC";
	}

	if (isset($data['start']) || isset($data['limit'])) {
		if ($data['start'] < 0) {
			$data['start'] = 0;
		}				

		if ($data['limit'] < 1) {
			$data['limit'] = 20;
		}	

		$sql .= " LIMIT " . (int)$data['start'] . "," . (int)$data['limit'];
	}

	$product_data = array();

	$query = $this->db->query($sql);

	foreach ($query->rows as $result) {
		$product_data[$result['product_id']] = $this->getProduct($result['product_id']);
	}

	return $product_data;
}