Rating::calculate

static function calculate()
{
	$updateTimestamp = (int) self::getParam('date_update', 0);
	$dateToday = new Date();
	if ($dateToday->getTimestamp() <= $updateTimestamp)
	{
		return;
	}
	self::setParam('date_update', $dateToday->getTimestamp());
	if (!$updateTimestamp)
	{
		return;
	}


	$yesterdayData = Model\DailyCounterTable::getRowByDate(1);
	if (!$yesterdayData)
	{
		return;
	}

	// don't upgrade if error count more than 10% of sent
	$countSent = (int) $yesterdayData['SENT_CNT'];
	$countError = (int) $yesterdayData['ERROR_CNT'];
	if ($countSent > 0 && ($countError / $countSent) > 0.1)
	{
		$countSent -= $countError;
	}

	$ratio = self::getRatio(1);
	if ($ratio >= self::getBlockRate())
	{
		self::block();
	}
	elseif ($ratio >= self::getDownRate())
	{
		self::downgrade();
	}
	elseif ($countSent >= DailyLimit::instance()->getLimit())
	{
		self::upgrade();
	}
}