USE `vn`;
DROP procedure IF EXISTS `department_calcTreeRec`;

DELIMITER $$
USE `vn`$$
CREATE DEFINER=`root`@`%` PROCEDURE `department_calcTreeRec`(
	vSelf INT,
    vPath VARCHAR(255),
    vDepth INT,
    INOUT vIndex INT,
    OUT vSons INT
)
BEGIN
/**
 * Calculates and sets the #path, #lft, #rgt, #sons and #depth
 * columns for all children of the passed node. Once calculated
 * the last node rgt index and the number of sons are returned.
 * To update it's children, this procedure calls itself recursively
 * for each one.
 *
 * @vSelf The node identifier
 * @vPath The initial path
 * @vDepth The initial depth
 * @vIndex The initial lft index
 * @vSons The number of direct sons
 */
    DECLARE vChildFk INT;
    DECLARE vLft INT;
    DECLARE vMySons INT;
	DECLARE vDone BOOL;
	DECLARE vChildren CURSOR FOR
		SELECT id FROM department
			WHERE (vSelf IS NULL AND parentFk IS NULL)
				OR (vSelf IS NOT NULL AND parentFk = vSelf);

	DECLARE CONTINUE HANDLER FOR NOT FOUND SET vDone = TRUE;
    
    SET vSons = 0;

	OPEN vChildren;
	myLoop: LOOP
		SET vDone = FALSE;
		FETCH vChildren INTO vChildFk;

		IF vDone THEN
			LEAVE myLoop;
		END IF;
        
        SET vIndex = vIndex + 1;
        SET vLft = vIndex;
        SET vSons = vSons + 1;
    
		CALL department_calcTreeRec(
			vChildFk,
            CONCAT(vPath, vChildFk, '/'),
            vDepth + 1,
            vIndex,
            vMySons
		);

        SET vIndex = vIndex + 1;

		INSERT INTO tNestedTree
			SET id = vChildFk,
				path = vPath,
				lft = vLft,
				rgt = vIndex,
				depth = vDepth,
				sons = vMySons;
	END LOOP;
	CLOSE vChildren;
END$$

DELIMITER ;