 uint256 unseen = IERC20(token).balanceOf(address(this)) - r.balance;
            if (unseen > 0) {
                _notifyReward(token, unseen);
            }
 r.rewardPerSecond = ((reward + leftover) * 1e12) / rewardsDuration;
else {
            uint256 remaining = r.periodFinish - block.timestamp;
            uint256 leftover = (remaining * r.rewardPerSecond) / 1e12;
            r.rewardPerSecond = ((reward + leftover) * 1e12) / rewardsDuration;
        }

        r.lastUpdateTime = block.timestamp;
        r.periodFinish = block.timestamp + rewardsDuration;
        r.balance = r.balance + reward;
