DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`creditRecovery`()
BEGIN
	DECLARE EXIT HANDLER FOR SQLSTATE '45000'
	BEGIN
		ROLLBACK;
		RESIGNAL;
	END;

	START TRANSACTION;

	UPDATE `client` c
			JOIN payMethod pm ON pm.id = c.payMethodFk
		SET c.credit = 0
		WHERE pm.`code` = 'card';

	DROP TEMPORARY TABLE IF EXISTS tCreditClients;
	CREATE TEMPORARY TABLE tCreditClients
		SELECT clientFk, IF (credit > recovery ,credit - recovery,0) newCredit
		FROM (
			SELECT r.clientFk,
				r.amount recovery,
				timestampadd(DAY, r.period, sub2.created) deadLine,
				sub2.amount credit
				FROM recovery r
					JOIN (
						SELECT clientFk, amount , created
						FROM (
							SELECT * FROM clientCredit
								ORDER BY created DESC
								LIMIT 10000000000000000000
						) sub
						GROUP BY clientFk
					) sub2 ON sub2.clientFk = r.clientFk
				WHERE r.finished IS NULL OR r.finished >= util.VN_CURDATE()
				GROUP BY r.clientFk
					HAVING deadLine <= util.VN_CURDATE()
		) sub3
		WHERE credit > 0;

	UPDATE client c
		JOIN tCreditClients cc ON cc.clientFk = c.clientFk
			SET c.credit = newCredit;
	
	DROP TEMPORARY TABLE tCreditClients;
	COMMIT;

END$$
DELIMITER ;