Contract

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "./StakingProxyBase.sol";
import "../interfaces/IFxnGauge.sol";
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';

/*
Vault implementation for basic erc20 tokens
*/
contract StakingProxyERC20 is StakingProxyBase, ReentrancyGuard{
    using SafeERC20 for IERC20;

    constructor(address _poolRegistry, address _feeRegistry, address _fxnminter) 
        StakingProxyBase(_poolRegistry, _feeRegistry, _fxnminter){
    }

    //vault type
    function vaultType() external pure override returns(VaultType){
        return VaultType.Erc20Basic;
    }

    //vault version
    function vaultVersion() external pure override returns(uint256){
        return 1;
    }

    //initialize vault
    function initialize(address _owner, uint256 _pid) public override{
        super.initialize(_owner, _pid);

        //set infinite approval
        IERC20(stakingToken).approve(gaugeAddress, type(uint256).max);

        //set extra rewards to send directly back to owner
        //..could technically save gas on initialize() by using claim(address,address) but
        //since claim is unguarded would be better UX to set receiver in case called by some other address
        IFxnGauge(gaugeAddress).setRewardReceiver(_owner);
    }


    //deposit into gauge
    function deposit(uint256 _amount) external onlyOwner nonReentrant{
        if(_amount > 0){
            //pull tokens from user
            address _stakingToken = stakingToken;
            IERC20(_stakingToken).safeTransferFrom(msg.sender, address(this), _amount);

            //stake (use balanceof in case of change during transfer)
            IFxnGauge(gaugeAddress).deposit(IERC20(_stakingToken).balanceOf(address(this)));
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }


    //withdraw a staked position
    function withdraw(uint256 _amount) external onlyOwner nonReentrant{

        //withdraw to vault
        IFxnGauge(gaugeAddress).withdraw(_amount);

        //checkpoint rewards
        _checkpointRewards();

        //send back to owner any staking tokens on the vault (may differ from _amount)
        address _stakingToken = stakingToken;
        IERC20(_stakingToken).safeTransfer(msg.sender, IERC20(_stakingToken).balanceOf(address(this)));
    }


    //return earned tokens on staking contract and any tokens that are on this vault
    function earned() external override returns (address[] memory token_addresses, uint256[] memory total_earned) {
        //get list of reward tokens
        address[] memory rewardTokens = IFxnGauge(gaugeAddress).getActiveRewardTokens();

        //create array of rewards on gauge, rewards on extra reward contract, and fxn that is minted
        address _rewards = rewards;
        token_addresses = new address[](rewardTokens.length + IRewards(_rewards).rewardTokenLength() + 1);// +1 for fxn
        total_earned = new uint256[](rewardTokens.length + IRewards(_rewards).rewardTokenLength() + 1); // +1 for fxn

        //simulate claiming

        //mint fxn
        try IFxnTokenMinter(fxnMinter).mint(gaugeAddress){}catch{}
        
        //check fxn
        token_addresses[0] = fxn;
        //remove fee (assumes all fxn on vault came from minting)
        total_earned[0] = IERC20(fxn).balanceOf(address(this)) * (FEE_DENOMINATOR - IFeeRegistry(feeRegistry).totalFees()) / FEE_DENOMINATOR;

        //claim other rewards on gauge to this address to tally
        IFxnGauge(gaugeAddress).claim(address(this),address(this));

        //get balance of tokens
        for(uint256 i = 0; i < rewardTokens.length; i++){
            token_addresses[i+1] = rewardTokens[i];
            if(rewardTokens[i] == fxn){
                //if more fxn was distributed as an extra reward, add difference of current-minted
                total_earned[i+1] = IERC20(rewardTokens[i]).balanceOf(address(this)) - total_earned[0];
            }else{
                total_earned[i+1] = IERC20(rewardTokens[i]).balanceOf(address(this));
            }
        }

        //also add an extra rewards from convex's side
        IRewards.EarnedData[] memory extraRewards = IRewards(_rewards).claimableRewards(address(this));
        for(uint256 i = 0; i < extraRewards.length; i++){
            token_addresses[i+rewardTokens.length+1] = extraRewards[i].token;
            total_earned[i+rewardTokens.length+1] = extraRewards[i].amount;
        }
    }

    /*
    claim flow:
        mint fxn rewards directly to vault
        claim extra rewards directly to the owner
        calculate fees on fxn
        distribute fxn between owner and fee deposit
    */
    function getReward() external override{
        getReward(true);
    }

    //get reward with claim option.
    function getReward(bool _claim) public override{

        //claim
        if(_claim){
            //fxn rewards (claim here first then send to user after fees)
            try IFxnTokenMinter(fxnMinter).mint(gaugeAddress){}catch{}

            //extras (will get claimed directly to owner)
            IFxnGauge(gaugeAddress).claim();
        }

        //process fxn fees
        _processFxn();

        //extra rewards
        _processExtraRewards();
    }

    //get reward with claim option, as well as a specific token list to claim from convex extra rewards
    function getReward(bool _claim, address[] calldata _tokenList) external override{

        //claim
        if(_claim){
            //fxn rewards
            try IFxnTokenMinter(fxnMinter).mint(gaugeAddress){}catch{}

            //extras
            IFxnGauge(gaugeAddress).claim();
        }

        //process fxn fees
        _processFxn();

        //extra rewards
        _processExtraRewardsFilter(_tokenList);
    }

    //return any tokens in vault back to owner
    function transferTokens(address[] calldata _tokenList) external onlyOwner{
        //transfer tokens back to owner
        //fxn and gauge tokens are skipped
        _transferTokens(_tokenList);
    }

}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IRewards{
    struct EarnedData {
        address token;
        uint256 amount;
    }
    enum RewardState{
        NotInitialized,
        NoRewards,
        Active
    }
    
    function initialize(uint256 _pid, bool _startActive) external;
    function addReward(address _rewardsToken, address _distributor) external;
    function approveRewardDistributor(
        address _rewardsToken,
        address _distributor,
        bool _approved
    ) external;
    function deposit(address _owner, uint256 _amount) external;
    function withdraw(address _owner, uint256 _amount) external;
    function getReward(address _forward) external;
    function getRewardFilter(address _forward, address[] calldata _tokens) external;
    function notifyRewardAmount(address _rewardsToken, uint256 _reward) external;
    function balanceOf(address account) external view returns (uint256);
    function claimableRewards(address _account) external view returns(EarnedData[] memory userRewards);
    function rewardTokens(uint256 _rid) external view returns (address);
    function rewardTokenLength() external view returns(uint256);
    function rewardState() external view returns(RewardState);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IProxyVault {

    enum VaultType{
        Erc20Basic,
        RebalancePool
    }

    function vaultType() external view returns(VaultType);
    function vaultVersion() external view returns(uint256);
    function initialize(address _owner, uint256 _pid) external;
    function pid() external returns(uint256);
    function usingProxy() external returns(address);
    function owner() external returns(address);
    function gaugeAddress() external returns(address);
    function stakingToken() external returns(address);
    function rewards() external returns(address);
    function getReward() external;
    function getReward(bool _claim) external;
    function getReward(bool _claim, address[] calldata _rewardTokenList) external;
    function earned() external returns (address[] memory token_addresses, uint256[] memory total_earned);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IPoolRegistry {
    function poolLength() external view returns(uint256);
    function poolInfo(uint256 _pid) external view returns(address, address, address, address, uint8);
    function vaultMap(uint256 _pid, address _user) external view returns(address vault);
    function addUserVault(uint256 _pid, address _user) external returns(address vault, address stakeAddress, address stakeToken, address rewards);
    function deactivatePool(uint256 _pid) external;
    function addPool(address _implementation, address _stakingAddress, address _stakingToken) external;
    function setRewardActiveOnCreation(bool _active) external;
    function setRewardImplementation(address _imp) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// solhint-disable func-name-mixedcase
interface IFxnTokenMinter {
  function token() external view returns (address);

  function controller() external view returns (address);

  function minted(address user, address gauge) external view returns (uint256);

  function mint(address gauge_addr) external;

  function mint_many(address[8] memory gauges) external;

  function mint_for(address gauge, address _for) external;

  function toggle_approve_mint(address _user) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

interface IFxnGauge{

    //basics
    function stakingToken() external view returns(address);
    function totalSupply() external view returns(uint256);
    function workingSupply() external view returns(uint256);
    function workingBalanceOf(address _account) external view returns(uint256);
    function deposit(uint256 _amount) external;
    function deposit(uint256 _amount, address _receiver) external;
    function withdraw(uint256 _amount) external;
    function withdraw(uint256 _amount, address _receiver) external;
    function user_checkpoint(address _account) external returns (bool);
    function balanceOf(address _account) external view returns(uint256);
    function integrate_fraction(address account) external view returns (uint256);
    function baseToken() external view returns(address);
    function asset() external view returns(address);
    function market() external view returns(address);

    //weight sharing
    function toggleVoteSharing(address _staker) external;
    function acceptSharedVote(address _newOwner) external;
    function rejectSharedVote() external;
    function getStakerVoteOwner(address _account) external view returns (address);
    function numAcceptedStakers(address _account) external view returns (uint256);
    function sharedBalanceOf(address _account) external view returns (uint256);
    function veProxy() external view returns(address);

    //rewards
    function rewardData(address _token) external view returns(uint96 queued, uint80 rate, uint40 lastUpdate, uint40 finishAt);
    function getActiveRewardTokens() external view returns (address[] memory _rewardTokens);
    function rewardReceiver(address account) external view returns (address);
    function setRewardReceiver(address _newReceiver) external;
    function claim() external;
    function claim(address account) external;
    function claim(address account, address receiver) external;
    function getBoostRatio(address _account) external view returns (uint256);
    function depositReward(address _token, uint256 _amount) external;
    function voteOwnerBalances(address _account) external view returns(uint112 product, uint104 amount, uint40 updateAt);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface IFeeRegistry{
    function cvxfxnIncentive() external view returns(uint256);
    function cvxIncentive() external view returns(uint256);
    function platformIncentive() external view returns(uint256);
    function totalFees() external view returns(uint256);
    function maxFees() external view returns(uint256);
    function feeDeposit() external view returns(address);
    function getFeeDepositor(address _from) external view returns(address);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "../interfaces/IProxyVault.sol";
import "../interfaces/IFeeRegistry.sol";
import "../interfaces/IFxnGauge.sol";
import "../interfaces/IFxnTokenMinter.sol";
import "../interfaces/IRewards.sol";
import "../interfaces/IPoolRegistry.sol";
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';

/*
Base class for vaults

*/
contract StakingProxyBase is IProxyVault{
    using SafeERC20 for IERC20;

    address public constant fxn = address(0x365AccFCa291e7D3914637ABf1F7635dB165Bb09);
    address public constant vefxnProxy = address(0xd11a4Ee017cA0BECA8FA45fF2abFe9C6267b7881);
    address public immutable feeRegistry;
    address public immutable poolRegistry;
    address public immutable fxnMinter;

    address public owner; //owner of the vault
    address public gaugeAddress; //gauge contract
    address public stakingToken; //staking token
    address public rewards; //extra rewards on convex
    address public usingProxy; //address of proxy being used
    uint256 public pid;

    uint256 public constant FEE_DENOMINATOR = 10000;

    constructor(address _poolRegistry, address _feeRegistry, address _fxnminter){
        poolRegistry = _poolRegistry;
        feeRegistry = _feeRegistry;
        fxnMinter = _fxnminter;
    }

    modifier onlyOwner() {
        require(owner == msg.sender, "!auth");
        _;
    }

    modifier onlyAdmin() {
        require(vefxnProxy == msg.sender, "!auth_admin");
        _;
    }

    //vault type
    function vaultType() external virtual pure returns(VaultType){
        return VaultType.Erc20Basic;
    }

    //vault version
    function vaultVersion() external virtual pure returns(uint256){
        return 1;
    }

    //initialize vault
    function initialize(address _owner, uint256 _pid) public virtual{
        require(owner == address(0),"already init");
        owner = _owner;
        pid = _pid;

        //get pool info
        (,gaugeAddress, stakingToken, rewards,) = IPoolRegistry(poolRegistry).poolInfo(_pid);
    }

    //set what veFXN proxy this vault is using
    function setVeFXNProxy(address _proxy) external virtual onlyAdmin{
        //set the vefxn proxy
        _setVeFXNProxy(_proxy);
    }

    //set veFXN proxy the vault is using. call acceptSharedVote to start sharing vefxn proxy's boost
    function _setVeFXNProxy(address _proxyAddress) internal{
        //set proxy address on staking contract
        IFxnGauge(gaugeAddress).acceptSharedVote(_proxyAddress);
        if(_proxyAddress == vefxnProxy){
            //reset back to address 0 to default to convex's proxy, dont write if not needed.
            if(usingProxy != address(0)){
                usingProxy = address(0);
            }
        }else{
            //write non-default proxy address
            usingProxy = _proxyAddress;
        }
    }

    //get rewards and earned are type specific. extend in child class
    function getReward() external virtual{}
    function getReward(bool _claim) external virtual{}
    function getReward(bool _claim, address[] calldata _rewardTokenList) external virtual{}
    function earned() external virtual returns (address[] memory token_addresses, uint256[] memory total_earned){}


    //checkpoint and add/remove weight to convex rewards contract
    function _checkpointRewards() internal{
        //if rewards are active, checkpoint
        address _rewards = rewards;
        if(IRewards(_rewards).rewardState() == IRewards.RewardState.Active){
            //get user balance from the gauge
            uint256 userLiq = IFxnGauge(gaugeAddress).balanceOf(address(this));
            //get current balance of reward contract
            uint256 bal = IRewards(_rewards).balanceOf(address(this));
            if(userLiq >= bal){
                //add the difference to reward contract
                IRewards(_rewards).deposit(owner, userLiq - bal);
            }else{
                //remove the difference from the reward contract
                IRewards(_rewards).withdraw(owner, bal - userLiq);
            }
        }
    }

    //apply fees to fxn and send remaining to owner
    function _processFxn() internal{

        //get fee rate from fee registry (only need to know total, let deposit contract disperse itself)
        uint256 totalFees = IFeeRegistry(feeRegistry).totalFees();

        //send fxn fees to fee deposit
        uint256 fxnBalance = IERC20(fxn).balanceOf(address(this));
        uint256 sendAmount = fxnBalance * totalFees / FEE_DENOMINATOR;
        if(sendAmount > 0){
            //get deposit address for given proxy (address 0 will be handled by fee registry to return default convex proxy)
            IERC20(fxn).transfer(IFeeRegistry(feeRegistry).getFeeDepositor(usingProxy), sendAmount);
        }

        //transfer remaining fxn to owner
        sendAmount = IERC20(fxn).balanceOf(address(this));
        if(sendAmount > 0){
            IERC20(fxn).transfer(owner, sendAmount);
        }
    }

    //get extra rewards (convex side)
    function _processExtraRewards() internal{
        address _rewards = rewards;
        if(IRewards(_rewards).rewardState() == IRewards.RewardState.Active){
            //update reward balance if this is the first call since reward contract activation:
            //check if no balance recorded yet and set staked balance
            //dont use _checkpointRewards since difference of 0 will still call deposit()
            //as well as it will check rewardState twice
            uint256 bal = IRewards(_rewards).balanceOf(address(this));
            uint256 gaugeBalance = IFxnGauge(gaugeAddress).balanceOf(address(this));
            if(bal == 0 && gaugeBalance > 0){
                //set balance to gauge.balanceof(this)
                IRewards(_rewards).deposit(owner,gaugeBalance);
            }

            //get the rewards
            IRewards(_rewards).getReward(owner);
        }
    }

    //get extra rewards (convex side) with a filter list
    function _processExtraRewardsFilter(address[] calldata _tokens) internal{
        address _rewards = rewards;
        if(IRewards(_rewards).rewardState() == IRewards.RewardState.Active){
            //update reward balance if this is the first call since reward contract activation:
            //check if no balance recorded yet and set staked balance
            //dont use _checkpointRewards since difference of 0 will still call deposit()
            //as well as it will check rewardState twice
            uint256 bal = IRewards(_rewards).balanceOf(address(this));
            uint256 gaugeBalance = IFxnGauge(gaugeAddress).balanceOf(address(this));
            if(bal == 0 && gaugeBalance > 0){
                //set balance to gauge.balanceof(this)
                IRewards(_rewards).deposit(owner,gaugeBalance);
            }

            //get the rewards
            IRewards(_rewards).getRewardFilter(owner,_tokens);
        }
    }

    //transfer other reward tokens besides fxn(which needs to have fees applied)
    //also block gauge tokens from being transfered out
    function _transferTokens(address[] memory _tokens) internal{
        //transfer all tokens
        for(uint256 i = 0; i < _tokens.length; i++){
            //dont allow fxn (need to take fee)
            //dont allow gauge token transfer
            if(_tokens[i] != fxn && _tokens[i] != gaugeAddress){
                uint256 bal = IERC20(_tokens[i]).balanceOf(address(this));
                if(bal > 0){
                    IERC20(_tokens[i]).safeTransfer(owner, bal);
                }
            }
        }
    }

    function _checkExecutable(address _address) internal virtual{
        require(_address != fxn && _address != stakingToken && _address != rewards, "!invalid target");
    }

    //allow arbitrary calls. some function signatures and targets are blocked
    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external onlyOwner returns (bool, bytes memory) {
        //fully block fxn, staking token(lp etc), and rewards
        _checkExecutable(_to);

        //only calls to staking(gauge) address if pool is shutdown
        if(_to == gaugeAddress){
            (, , , , uint8 shutdown) = IPoolRegistry(poolRegistry).poolInfo(pid);
            require(shutdown == 0,"!shutdown");
        }

        (bool success, bytes memory result) = _to.call{value:_value}(_data);
        require(success, "!success");
        return (success, result);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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