DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` PROCEDURE `vn`.`itemShelving_transfer`(
	vItemShelvingFk INT, 
	vShelvingCode VARCHAR(10)
)
BEGIN
/**
 * Transfiere producto de una ubicación a otra
 * fusionando si coincide el packing y la fecha.
 *
 * @param vItemShelvingFk Identificador de itemShelving
 * @param vShelvingCode Código de shelving
 */
	DECLARE vNewItemShelvingFk INT;
	DECLARE vShelvingFk INT;

	SELECT id INTO vShelvingFk
		FROM shelving
		WHERE code COLLATE utf8_unicode_ci = vShelvingCode;

	SELECT MAX(ish.id) INTO vNewItemShelvingFk
		FROM itemShelving ish
			JOIN (
				SELECT itemFk,
						packing,
						created,
						buyFk
					FROM itemShelving
					WHERE id = vItemShelvingFk
			) ish2 ON ish2.itemFk = ish.itemFk
				AND ish2.packing = ish.packing
				AND DATE(ish2.created) = DATE(ish.created)
				AND ish2.buyFk = ish.buyFk
		WHERE ish.shelvingFk = vShelvingFk;

	IF vNewItemShelvingFk THEN
		UPDATE itemShelving ish
				JOIN itemShelving ish2 ON ish2.id = vItemShelvingFk
			SET ish.visible = ish.visible + ish2.visible,
			 	ish.available = ish.available + ish2.available
			WHERE ish.id = vNewItemShelvingFk;

		DELETE FROM itemShelving
			WHERE id = vItemShelvingFk;
	ELSE
		IF (SELECT EXISTS(SELECT id FROM shelving WHERE id = vShelvingFk)) THEN
			UPDATE itemShelving
				SET shelvingFk = vShelvingFk
				WHERE id = vItemShelvingFk;
		ELSE
			CALL util.throw('The shelving not exists');
		END IF;
	END IF;
	SELECT TRUE;
END$$
DELIMITER ;