DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` PROCEDURE `vn`.`item_deactivateUnused`()
BEGIN
/**
 * Cambia a false el campo isActive de la tabla vn.item para todos aquellos
 * items que no se han comprado en los últimos meses configurados en
 * @vn.itemConfig.monthToDeactivate
 */
	DECLARE vMonthToDeactivate INT;

	SELECT monthToDeactivate INTO vMonthToDeactivate
		FROM vn.itemConfig;

	DROP TEMPORARY TABLE IF EXISTS tmp.buyMaxCreated;
	CREATE TEMPORARY TABLE tmp.buyMaxCreated
		ENGINE = MEMORY
		SELECT b.itemFk,
				MAX(b.created) created
			FROM vn.buy b
				JOIN vn.item i ON i.id = b.itemFk
			WHERE i.isActive
			GROUP BY itemFk;

	UPDATE vn.item i
			JOIN tmp.buyMaxCreated bmc ON bmc.itemFk = i.id
		SET i.isActive = FALSE
		WHERE bmc.created < util.VN_CURDATE() - INTERVAL vMonthToDeactivate MONTH;

	DROP TEMPORARY TABLE IF EXISTS tmp.buyMaxCreated;
END$$
DELIMITER ;