EntityActivities::calculateTotalForStage

public function calculateTotalForStage(string $stageId, array $filter): int
{
	$entityManager = EntityManager::resolveByTypeID($this->entityTypeId);
	if (!$entityManager)
	{
		return 0;
	}
	$stagesIds = array_column($this->getStagesList($this->categoryId), 'STATUS_ID');
	if (!in_array($stageId, $stagesIds, true))
	{
		return 0;
	}

	// if today is last week day, STAGE_THIS_WEEK cannot contain items:
	if ($stageId === $this->getStatusIdByCategoryId(self::STAGE_THIS_WEEK, $this->categoryId))
	{
		$lastWeekDay = $this->getLastWeekDay(new DateTime());
		if ($lastWeekDay->getTimestamp() === (new Date())->getTimestamp())
		{
			return 0;
		}
	}

	if ($this->isStageSkippedByActivitiesFilter($stageId, $this->getActivityCounterFilterValue($filter)))
	{
		return 0;
	}

	$stageFilter = $this->prepareCounterFilter($stageId, $filter);

	return $entityManager->getCount([
		'filter' => $stageFilter,
	]);
}