function _buy(address _user, address _refAddr, uint256 _roundId, uint256 _amount) internal {
// check valid to buy token
_eligibleToBuyToken(_user,_refAddr, _amount);
// fetch price in ETH again
priceInETH = _fetchPrice(dataFeed);
// update contributor
if(_roundUserAmountContribution[_roundId][_user] == 0){
_roundContributors[_roundId].push(_user);
}
if(userTotalAmountContribution[_user] == 0){
contributors.push(_user);
// update referral users
countReferralUsers[_refAddr] += 1;
referralUserList[_refAddr].push(_user);
parentReferral[_user] = _refAddr;
}
// calculate token amount
uint256 tokenSold = _calculateTokenAmount(_roundId, _amount);
// check max usd per round
if(!_checkTotalTokenRaisedPerRound(_roundId, tokenSold)) revert BuyExceed(tokenSold);
// update round info
tokenSaleRoundInfo[_roundId].totalTokenRoundSold += tokenSold;
tokenSaleRoundInfo[_roundId].totalAmountRoundRaised += _amount;
// update user info
_roundUserAmountContribution[_roundId][_user] += _amount;
_roundUserTokenReceived[_roundId][_user] += tokenSold;
userTotalAmountContribution[_user] += _amount;
userTotalTokenReceived[_user] += tokenSold;
// update total info
totalTokenSold += tokenSold;
totalAmountRaised += _amount;
// update referral rewards
address realRefAddr = parentReferral[_user];
_referralUserRewards(_user, realRefAddr, tokenSold);
// transfer native token to manager
payable(manager).transfer(_amount);
emit BuyToken(_user, _roundId, _amount);
}

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