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60// when buying olp with token other than ETH
61function mintAndStakeOlp(address _token, uint256 _amount, uint256 _minUsdg, uint256 _minOlp) external nonReentrant returns (uint256) {
62    require(_amount > 0, "RewardRouter: invalid _amount");
63
64    // send token to Olp Manager and olp to account
65    address account = msg.sender;
66    uint256 olpAmount = IOlpManager(olpManager).addLiquidityForAccount(account, account, _token, _amount, _minUsdg, _minOlp);
67    
68    // stake fOLP and sOLP in order
69    IRewardTracker(feeOlpTracker).stakeForAccount(account, account, olp, olpAmount);
70
71    emit StakeOlp(account, olpAmount);
72
73    return olpAmount;
74}
75
76// when buying olp with ETH
77function mintAndStakeOlpETH(uint256 _minUsdg, uint256 _minOlp) external payable nonReentrant returns (uint256) {
78    require(msg.value > 0, "RewardRouter: invalid msg.value");
79
80    // convert ETH to WETH
81    // get approval from Olp Manager
82    IWETH(weth).deposit{value: msg.value}();
83    IERC20(weth).approve(olpManager, msg.value);
84
85    address account = msg.sender;
86    uint256 olpAmount = IOlpManager(olpManager).addLiquidityForAccount(address(this), account, weth, msg.value, _minUsdg, _minOlp);
87
88    IRewardTracker(feeOlpTracker).stakeForAccount(account, account, olp, olpAmount);
89
90    emit StakeOlp(account, olpAmount);
91
92    return olpAmount;
93}