DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`itemShelvingSale_setQuantity`(
	vItemShelvingSaleFk INT(10),
	vQuantity DECIMAL(10,0),
	vIsItemShelvingSaleEmpty BOOLEAN
)
BEGIN
/**
 * Gestiona la reserva de un itemShelvingFk, actualizando isPicked y quantity
 * en itemShelvingSale y sale.isPicked en caso necesario. 
 * Si la reserva de la ubicación es fallida, se regulariza la situación 
 * 
 * @param vItemShelvingSaleFk Id itemShelvingSaleFK 
 * @param vQuantity Cantidad real que se ha cogido de la ubicación
 * @param vIsItemShelvingSaleEmpty determina si la ubicación itemShelvingSale se ha 
 * quedado vacio tras el movimiento
 */
	DECLARE vSaleFk INT;
	DECLARE vItemShelvingFk INT;
	DECLARE vReservedQuantity INT;
	DECLARE vRemainingQuantity INT;
	DECLARE vItemFk INT;
	DECLARE vTotalQuantity INT;

	DECLARE EXIT HANDLER FOR SQLEXCEPTION
		BEGIN
			ROLLBACK;
			RESIGNAL;
		END;

	IF (SELECT isPicked FROM itemShelvingSale WHERE id = vItemShelvingSaleFk) THEN
		CALL util.throw('Reserva completada');
	END IF;

	SELECT s.itemFk, iss.saleFk, iss.itemShelvingFk, SUM(IFNULL(iss.quantity,0))
			INTO vItemFk, vSaleFk, vItemShelvingFk, vReservedQuantity
		FROM itemShelvingSale iss
			JOIN sale s ON s.id = iss.saleFk
		WHERE iss.id = vItemShelvingSaleFk
			AND NOT iss.isPicked;

	IF vQuantity > vReservedQuantity 
		OR (vQuantity < vReservedQuantity AND 
			(NOT vIsItemShelvingSaleEmpty OR vIsItemShelvingSaleEmpty IS NULL))
		OR (vIsItemShelvingSaleEmpty IS NOT NULL AND vQuantity = vReservedQuantity) THEN
		CALL util.throw('La cantidad no puede distinta a la reserva');
	END IF;


	START TRANSACTION;


	UPDATE itemShelvingSale 
		SET isPicked = TRUE,
			quantity = vQuantity
		WHERE id = vItemShelvingSaleFk;	
	
	SELECT id INTO vItemShelvingFk 
		FROM itemShelving 
		WHERE id = vItemShelvingFk 
			AND FALSE 
		FOR UPDATE;

	UPDATE itemShelving
		SET visible = IF(vIsItemShelvingSaleEmpty, 0, GREATEST(0, visible - vQuantity))
		WHERE id = vItemShelvingFk;

	COMMIT;
	
	IF vIsItemShelvingSaleEmpty AND vQuantity <> vReservedQuantity THEN

		UPDATE itemShelving
			SET visible = 0,
				available = 0
			WHERE id = vItemShelvingFk 
				AND itemFk = vItemFk;	

		CALL itemShelvingSale_addBySale(vSaleFk);
								 
		START TRANSACTION;

		INSERT INTO itemShelvingSaleReserv (saleFk)
			SELECT DISTINCT iss.saleFk
				FROM itemShelvingSale iss
					JOIN itemShelving ish ON ish.id = iss.itemShelvingFk
				WHERE iss.itemShelvingFk = vItemShelvingFk 			 
					AND ish.itemFk = vItemFk
					AND NOT iss.isPicked;

		DELETE iss
			FROM itemShelvingSale iss
					JOIN itemShelving ish ON ish.id = iss.itemShelvingFk
				WHERE iss.itemShelvingFk = vItemShelvingFk 			 
					AND ish.itemFk = vItemFk
					AND NOT iss.isPicked;
		COMMIT;
	
		CALL itemShelvingSale_doReserve();
	END IF;
	
	SELECT SUM(IF(isPicked, 0, quantity)), SUM(quantity) 
		INTO vRemainingQuantity, vTotalQuantity
		FROM itemShelvingSale 
			WHERE saleFk = vSaleFk;

	IF vRemainingQuantity = 0 THEN
		START TRANSACTION;
		
		CALL saleTracking_new(
			vSaleFk,
			TRUE, 
			vTotalQuantity, 
			`account`.`myUser_getId`(), 
			NULL,
			'PREPARED',
			TRUE);

		UPDATE sale s
			SET s.quantity = vTotalQuantity,
				isPicked = TRUE
			WHERE s.id = vSaleFk;
		
		COMMIT;
	END IF;
END$$
DELIMITER ;