protected function calculateResidualPeriod(PeriodData $periodData, \DateInterval $leftover)
{
$currentPeriod = $periodData->getPeriod();
$periodSeconds = ConvertTime::convertIntervalToSeconds($currentPeriod);
$leftoverSeconds = ConvertTime::convertIntervalToSeconds($leftover);
$diff = $periodSeconds - $leftoverSeconds;
if ($diff < 0) {
throw new OccurrencesException("Time is enough, residual period is not required.");
}
return new \DateInterval("PT" . $diff . "S");
}
protected function resolvePeriodLabel(PeriodData $occurrencePeriod, $periodLabels)
{
$periodInHours = ConvertTime::convertIntervalToHours($occurrencePeriod->getPeriod());
return $periodLabels[$periodInHours];
}