protected function getTotalPointsSpentInLast365Days(TBT_Rewards_Model_Customer $c)
{
$yearStart = date("Y-m-d", time() - self::SECS_IN_YEAR);
// get current year
$filteredTransferes = $c->getCustomerPointsCollectionAll()->addFieldToFilter("quantity", array('lt' => 0))->addFieldToFilter("creation_ts", array('gteq' => $yearStart))->addFieldToFilter("reason_id", array('eq' => TBT_Rewards_Model_Transfer_Reason::REASON_CUSTOMER_REDEMPTION))->addFieldToFilter("customer_id", $c->getId());
$points_spent = $filteredTransferes->sumPoints()->getFirstItem()->getPointsCount();
return $points_spent;
}