/**
* Recursive method that pops the next leg off the array of legs to find the first reachable connecting service.
*
* Once found the method calls itself again to do the next leg until there are no more legs left.
*
* @param Leg $previousLeg
* @param TransferPatternLeg[] $transferLegs
* @param string $destination
* @param Leg[] $legs
* @return Journey
* @throws PlanningException
*/
private function getJourneyAfter(Leg $previousLeg, array $transferLegs, $destination, array &$legs)
{
$transferTime = 0;
$currentTransferLeg = array_shift($transferLegs);
// if we've run out of legs to scan maybe there is a transfer at the end
if ($currentTransferLeg === null) {
$legs[] = $this->getTransfer($previousLeg->getDestination(), $destination, $previousLeg->getArrivalTime());
return new Journey($legs);
}
// if these connections aren't linked, we might need a non-timetable connection to link us
if ($previousLeg->getDestination() !== $currentTransferLeg->getOrigin()) {
$transfer = $this->getTransfer($previousLeg->getDestination(), $currentTransferLeg->getOrigin(), $previousLeg->getArrivalTime());
$legs[] = $transfer;
$transferTime = $transfer->getDuration();
}
/** @var Leg $leg */
foreach ($currentTransferLeg->getLegs() as $leg) {
if ($previousLeg->getArrivalTime() + $transferTime + $this->getInterchange($leg->getOrigin()) <= $leg->getDepartureTime()) {
$legs[] = $leg;
if ($leg->getDestination() === $destination) {
return new Journey($legs);
} else {
return $this->getJourneyAfter($leg, $transferLegs, $destination, $legs);
}
}
}
throw new PlanningException("Ran out of connections before reaching the destination");
}
/**
* @param Leg $leg
* @return stdClass
*/
private function getLeg(Leg $leg)
{
$json = new stdClass();
$json->mode = strtolower($leg->getMode());
if ($leg->isTransfer()) {
$json->origin = $leg->getOrigin();
$json->destination = $leg->getDestination();
$json->duration = $this->getTime($leg->getDuration());
return $json;
}
$json->service = $leg->getService();
$json->operator = $leg->getOperator();
$json->callingPoints = [$this->getCallingPoint($leg->getOrigin(), $leg->getDepartureTime())];
foreach ($leg->getConnections() as $c) {
$json->callingPoints[] = $this->getCallingPoint($c->getDestination(), $c->getArrivalTime());
}
return $json;
}