Calculate Customer points

customer.php

<?php

    protected function calculateLoyaltyPoints($Loyalty_Points, $Loyalty_Participant): int
    {
        if (!isset($Loyalty_Points->SN_Loyalty_Points)) {
            return 0;
        }

        if (!$Loyalty_Participant) {
            return 0;
        }

        if (!is_array($Loyalty_Points->SN_Loyalty_Points)) {
            $history[] = $Loyalty_Points->SN_Loyalty_Points;
        } else {
            $history = $Loyalty_Points->SN_Loyalty_Points;
        }

        $points = 0;

        $today = new \DateTime();

        foreach ($history as $item) {

            $expiration = new \DateTime($item->Expiration_Date);

            if ($expiration < $today) {
                continue;
            }

            // redeemed points, not processed in NAV yet
            if ((int)$item->Points < 0) {
                $points += (int)$item->Points;
                continue;
            }

            if ($item->Positive) {
                $points += (int)$item->Points;
            } else {
                $points -= (int)$item->Points;
            }
        }

        return $points;
    }