uint bribeStart = block.timestamp - (block.timestamp % (7 days)) + BRIBE_LAG;
uint adjustedTstamp = block.timestamp < bribeStart ? bribeStart : bribeStart + 7 days;
if (rewardRate[token] == 0) _writeRewardPerTokenCheckpoint(token, 0, adjustedTstamp);
(rewardPerTokenStored[token], lastUpdateTime[token]) = _updateRewardPerToken(token);
_claimFees();

if (block.timestamp >= periodFinish[token]) {
    _safeTransferFrom(token, msg.sender, address(this), amount);
    rewardRate[token] = amount / DURATION;
} else {
    uint _remaining = periodFinish[token] - block.timestamp;
    uint _left = _remaining * rewardRate[token];
    require(amount > _left);
    _safeTransferFrom(token, msg.sender, address(this), amount);
    rewardRate[token] = (amount + _left) / DURATION;
}
function rewardPerToken(address token) public view returns (uint) {
    if (derivedSupply == 0) {
        return rewardPerTokenStored[token];
    }
    return rewardPerTokenStored[token] + ((lastTimeRewardApplicable(token) - Math.min(lastUpdateTime[token], periodFinish[token])) * rewardRate[token] * PRECISION / derivedSupply);
}
uint nextPeriodFinish = adjustedTstamp + DURATION;
uint timeUntilNextPeriodFinish = nextPeriodFinish - block.timestamp;
if (block.timestamp >= periodFinish[token]) {
    _safeTransferFrom(token, msg.sender, address(this), amount);
    rewardRate[token] = amount / timeUntilNextPeriodFinish;
} else {
    uint _remaining = periodFinish[token] - block.timestamp;
    uint _left = _remaining * rewardRate[token];
    require(amount > _left);
    _safeTransferFrom(token, msg.sender, address(this), amount);
    rewardRate[token] = (amount + _left) / timeUntilNextPeriodFinish;
}
require(rewardRate[token] > 0);
uint balance = IERC20(token).balanceOf(address(this));
require(rewardRate[token] <= balance / timeUntilNextPeriodFinish, "Provided reward too high");
periodFinish[token] = nextPeriodFinish;
