DROP procedure IF EXISTS `zoneNestPostcode`;

DELIMITER $$
CREATE DEFINER=`root`@`%` PROCEDURE `vn`.`zoneNestPostcode`()
BEGIN

	DECLARE vDone BOOL;
    DECLARE vParent INT DEFAULT 1;
    DECLARE vGeoFk INT;
    DECLARE vChildFk INT;
    DECLARE vChildName VARCHAR(100);
	DECLARE postcodeCur CURSOR FOR
		SELECT t.geoFk, pc.`code`, pc.`code`
			FROM vn.postCode pc 
				JOIN vn.town t ON t.id = pc.townFk
				JOIN vn.province p ON p.id = t.provinceFk
				JOIN tmp.country tc ON tc.id = p.countryFk
			ORDER BY t.geoFk, pc.`code`;
			
	DECLARE CONTINUE HANDLER FOR NOT FOUND SET vDone = TRUE;
    
    -- Remove existing postCodes from zoneGeo
	DELETE zg FROM vn.postCode pc 
		JOIN vn.town t ON t.id = pc.townFk
		JOIN vn.province p ON p.id = t.provinceFk
		JOIN tmp.country tc ON tc.id = p.countryFk
		JOIN tmp.zoneGeo zg ON zg.id = pc.geoFk;
			
	-- Reset town geoFk
	UPDATE vn.postCode pc 
		JOIN vn.town t ON t.id = pc.townFk
		JOIN vn.province p ON p.id = t.provinceFk
		JOIN tmp.country tc ON tc.id = p.countryFk
			SET pc.geoFk = NULL 
		WHERE pc.geoFk IS NOT NULL;

	-- > Postcode cursor start
	OPEN postcodeCur;
	
	postcodeLoop: LOOP
		SET vDone = FALSE;
        
		FETCH postcodeCur INTO vParent, vChildFk, vChildName;
		
		IF vDone THEN
			LEAVE postcodeLoop;
		END IF;
		
		CALL nst.nodeAdd('tmp', 'zoneGeo', vParent, vChildName);
	END LOOP;
	CLOSE postcodeCur;
	-- < Postcode cursor end
	
	UPDATE postCode p
		JOIN tmp.zoneGeo z ON z.name = p.code
			SET p.geoFk = z.id
		WHERE p.geoFk IS NULL;
END$$

DELIMITER ;