DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`itemShelvingSale_addBySale`(
	vSaleFk INT
)
proc: BEGIN
/**
 * Reserva una línea de venta en la ubicación más óptima
 *
 * @param vSaleFk Id de sale 
 * @param vItemShelvingSaleFk Id de reserva
 */
	DECLARE vLastPickingOrder INT;
	DECLARE vDone INT DEFAULT FALSE;
	DECLARE vItemShelvingFk INT;
	DECLARE vAvailable INT;
	DECLARE vReservedQuantity INT;
	DECLARE vOutStanding INT;
	DECLARE vUserFk INT; 

	DECLARE vItemShelvingAvailable CURSOR FOR 
		SELECT ish.id itemShelvingFk,
				ish.available
			FROM sale s
				JOIN itemShelving ish ON ish.itemFk = s.itemFk
				JOIN shelving sh ON sh.code = ish.shelvingFk
				JOIN parking p ON p.id = sh.parkingFk
				JOIN sector sc ON sc.id = p.sectorFk
				JOIN productionConfig pc	
			WHERE s.id = vSaleFk
				AND NOT sc.isHideForPickers
			ORDER BY s.id,
				p.pickingOrder >= vLastPickingOrder,
				sh.priority DESC,
				ish.available >= s.quantity DESC,
				s.quantity MOD ish.grouping = 0 DESC,
				ish.grouping DESC,
				IF(pc.orderMode = 'Location', p.pickingOrder, ish.created);

	DECLARE CONTINUE HANDLER FOR NOT FOUND SET vDone = TRUE;
	DECLARE EXIT HANDLER FOR SQLEXCEPTION
		BEGIN
			ROLLBACK;
			RESIGNAL;
		END;
	
	SELECT MAX(p.pickingOrder), s.quantity - SUM(IFNULL(iss.quantity, 0))
		INTO vLastPickingOrder, vOutStanding
		FROM sale s
			LEFT JOIN itemShelvingSale iss ON iss.saleFk = s.id
			LEFT JOIN itemShelving ish ON ish.id = iss.itemShelvingFk
			LEFT JOIN shelving sh ON sh.code = ish.shelvingFk
			LEFT JOIN parking p ON p.id = sh.parkingFk
		WHERE s.id = vSaleFk;
		
	IF vOutStanding <= 0 THEN 
		LEAVE proc;
	END IF;

	SELECT getUser() INTO vUserFk;

	OPEN vItemShelvingAvailable;
	l: LOOP
		SET vDone = FALSE;
		FETCH vItemShelvingAvailable INTO vItemShelvingFk, vAvailable;

		IF vOutStanding <= 0 OR vDone THEN
			LEAVE l;
		END IF;

		START TRANSACTION;

		SELECT id INTO vItemShelvingFk 
			FROM itemShelving 
			WHERE id = vItemShelvingFk 
			FOR UPDATE;
	
		SELECT LEAST(vOutStanding, vAvailable) INTO vReservedQuantity;
		SET vOutStanding = vOutStanding - vReservedQuantity;
		
		IF vReservedQuantity > 0 THEN 

			INSERT INTO itemShelvingSale(
					itemShelvingFk,
					saleFk,
					quantity,
					userFk)
				SELECT vItemShelvingFk, 
					vSaleFk, 
					vReservedQuantity, 
					vUserFk;
			
			UPDATE itemShelving 
				SET available = available - vReservedQuantity
				WHERE id = vItemShelvingFk;

		END IF;

		COMMIT;	
	END LOOP;
	CLOSE vItemShelvingAvailable;
END$$
DELIMITER ;