CallDuration::prepare

public function prepare()
{
	if (!$this->isCurrentUserHasAccess())
	{
		return [];
	}

	$filterParameters = $this->getFilterParameters();

	$startDate = DateTime::createFromUserTime($filterParameters['TIME_PERIOD_from']);
	$finishDate = DateTime::createFromUserTime($filterParameters['TIME_PERIOD_to']);

	$previousPeriod = $this->getPreviousPeriod($startDate, $finishDate);
	$previousStartDate = $previousPeriod['from'];
	$previousFinishDate = $previousPeriod['to'];

	$report = $this->getQueryForReport(
		$startDate,
		$finishDate,
		$previousStartDate,
		$previousFinishDate,
		$filterParameters
	)->exec()->fetchAll();

	return [
		'startDate' => $filterParameters['TIME_PERIOD_from'],
		'finishDate' => $filterParameters['TIME_PERIOD_to'],
		'report' => $report
	];
}