DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` FUNCTION `vn`.`getTimeBetweenRoadmapAddresses`(
	vRoadmapAddressFrom INT,
	vRoadmapAddressTo INT
)
	RETURNS int(11)
	DETERMINISTIC
BEGIN
/**
 * Retorna el tiempo en segundos que se suele tardar en ir
 * de un punto de distribución a otro en una ruta troncal.
 *
 * @param vRoadmapAddressFrom Punto de distribución de origen
 * @param vRoadmapAddressTo Punto de distribución de destino
 * @return Tiempo en segundos
 */
	DECLARE vSeconds INT;

	WITH wRoadmapStop AS (
		SELECT ROW_NUMBER() OVER(PARTITION BY roadmapFk ORDER BY eta) `sequence`,
				roadmapFk,
				roadmapAddressFk,
				eta
			FROM vn.roadmapStop
			WHERE roadmapFk IS NOT NULL
				AND roadmapAddressFk IS NOT NULL
				AND eta IS NOT NULL
	)
	SELECT AVG(TIME_TO_SEC(TIMEDIFF(rsTo.eta, rsFrom.eta))) INTO vSeconds
		FROM wRoadmapStop rsFrom
			JOIN wRoadmapStop rsTo ON rsTo.roadmapFk = rsFrom.roadmapFk
		WHERE rsFrom.roadmapAddressFk = vRoadmapAddressFrom
			AND rsTo.roadmapAddressFk = vRoadmapAddressTo
			AND rsFrom.`sequence` + 1 = rsTo.`sequence`;
	
	IF NOT IFNULL(vSeconds, 0) THEN
		WITH wRoadmap AS (
			SELECT id,
					roadmapAddressFk,
					etd
				FROM vn.roadmap
				WHERE roadmapAddressFk = vRoadmapAddressFrom
					AND etd IS NOT NULL
		), wRoadmapStop AS (
			SELECT ROW_NUMBER() OVER(PARTITION BY roadmapFk ORDER BY eta) `sequence`,
					roadmapFk,
					roadmapAddressFk,
					eta
				FROM vn.roadmapStop
				WHERE roadmapFk IS NOT NULL
					AND roadmapAddressFk = vRoadmapAddressTo
					AND eta IS NOT NULL
		)
		SELECT AVG(TIME_TO_SEC(TIMEDIFF(rsTo.eta, rFrom.etd))) INTO vSeconds
			FROM wRoadmap rFrom
				JOIN wRoadmapStop rsTo ON rsTo.roadmapFk = rFrom.id
					AND rsTo.`sequence` = 1;
	END IF;

	RETURN vSeconds;
END$$
DELIMITER ;