// File: UnionZap.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "Ownable.sol";
import "SafeERC20.sol";
import "IMultiMerkleStash.sol";
import "IMerkleDistributorV2.sol";
import "IUniV2Router.sol";
import "IWETH.sol";
import "ICvxCrvDeposit.sol";
import "IVotiumRegistry.sol";
import "IUniV3Router.sol";
import "ICurveV2Pool.sol";
import "ISwapper.sol";
import "UnionBase.sol";

contract UnionZap is Ownable, UnionBase {
    using SafeERC20 for IERC20;

    address public votiumDistributor =
        0x378Ba9B73309bE80BF4C2c027aAD799766a7ED5A;

    address private constant SUSHI_ROUTER =
        0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F;
    address private constant CVXCRV_DEPOSIT =
        0x8014595F2AB54cD7c604B00E9fb932176fDc86Ae;
    address public constant VOTIUM_REGISTRY =
        0x92e6E43f99809dF84ed2D533e1FD8017eb966ee2;
    address private constant T_TOKEN =
        0xCdF7028ceAB81fA0C6971208e83fa7872994beE5;
    address private constant T_ETH_POOL =
        0x752eBeb79963cf0732E9c0fec72a49FD1DEfAEAC;
    address private constant UNISWAP_ROUTER =
        0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address private constant UNIV3_ROUTER =
        0xE592427A0AEce92De3Edee1F18E0157C05861564;
    address private constant WETH_TOKEN =
        0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    address[] public outputTokens;
    address public platform = 0x9Bc7c6ad7E7Cf3A6fCB58fb21e27752AC1e53f99;

    uint256 private constant DECIMALS = 1e9;
    uint256 public platformFee = 2e7;

    mapping(uint256 => address) private routers;
    mapping(uint256 => uint24) private fees;

    struct tokenContracts {
        address pool;
        address swapper;
        address distributor;
    }

    struct curveSwapParams {
        address pool;
        uint16 ethIndex;
    }

    mapping(address => tokenContracts) public tokenInfo;
    mapping(address => curveSwapParams) public curveRegistry;

    event Received(address sender, uint256 amount);
    event Distributed(uint256 amount, address token, address distributor);
    event VotiumDistributorUpdated(address distributor);
    event FundsRetrieved(address token, address to, uint256 amount);
    event CurvePoolUpdated(address token, address pool);
    event OutputTokenUpdated(
        address token,
        address pool,
        address swapper,
        address distributor
    );
    event PlatformFeeUpdated(uint256 _fee);
    event PlatformUpdated(address indexed _platform);

    constructor() {
        routers[0] = SUSHI_ROUTER;
        routers[1] = UNISWAP_ROUTER;
        fees[0] = 3000;
        fees[1] = 10000;
        curveRegistry[CVX_TOKEN] = curveSwapParams(CURVE_CVX_ETH_POOL, 0);
        curveRegistry[T_TOKEN] = curveSwapParams(T_ETH_POOL, 0);
    }

    /// @notice Add a pool and its swap params to the registry
    /// @param token - Address of the token to swap on Curve
    /// @param params - Address of the pool and WETH index there
    function addCurvePool(address token, curveSwapParams calldata params)
        external
        onlyOwner
    {
        curveRegistry[token] = params;
        IERC20(token).safeApprove(params.pool, 0);
        IERC20(token).safeApprove(params.pool, type(uint256).max);
        emit CurvePoolUpdated(token, params.pool);
    }

    /// @notice Add or update contracts used for distribution of output tokens
    /// @param token - Address of the output token
    /// @param params - The Curve pool and distributor associated w/ the token
    /// @dev No removal options to avoid indexing errors with swaps, pass 0 weight for unused assets
    /// @dev Pool needs to be Curve v2 pool with price oracle
    function updateOutputToken(address token, tokenContracts calldata params)
        external
        onlyOwner
    {
        assert(params.pool != address(0));
        // if we don't have any pool info, it's an addition
        if (tokenInfo[token].pool == address(0)) {
            outputTokens.push(token);
        }
        tokenInfo[token] = params;
        emit OutputTokenUpdated(
            token,
            params.pool,
            params.swapper,
            params.distributor
        );
    }

    /// @notice Remove a pool from the registry
    /// @param token - Address of token associated with the pool
    function removeCurvePool(address token) external onlyOwner {
        IERC20(token).safeApprove(curveRegistry[token].pool, 0);
        delete curveRegistry[token];
        emit CurvePoolUpdated(token, address(0));
    }

    /// @notice Change forwarding address in Votium registry
    /// @param _to - address that will be forwarded to
    /// @dev To be used in case of migration, rewards can be forwarded to
    /// new contracts
    function setForwarding(address _to) external onlyOwner {
        IVotiumRegistry(VOTIUM_REGISTRY).setRegistry(_to);
    }

    /// @notice Updates the part of incentives redirected to the platform
    /// @param _fee - the amount of the new platform fee (in BIPS)
    function setPlatformFee(uint256 _fee) external onlyOwner {
        platformFee = _fee;
        emit PlatformFeeUpdated(_fee);
    }

    /// @notice Updates the address to which platform fees are paid out
    /// @param _platform - the new platform wallet address
    function setPlatform(address _platform)
        external
        onlyOwner
        notToZeroAddress(_platform)
    {
        platform = _platform;
        emit PlatformUpdated(_platform);
    }

    /// @notice Update the votium contract address to claim for
    /// @param _distributor - Address of the new contract
    function updateVotiumDistributor(address _distributor)
        external
        onlyOwner
        notToZeroAddress(_distributor)
    {
        votiumDistributor = _distributor;
        emit VotiumDistributorUpdated(_distributor);
    }

    /// @notice Withdraws specified ERC20 tokens to the multisig
    /// @param tokens - the tokens to retrieve
    /// @param to - address to send the tokens to
    /// @dev This is needed to handle tokens that don't have ETH pairs on sushi
    /// or need to be swapped on other chains (NBST, WormholeLUNA...)
    function retrieveTokens(address[] calldata tokens, address to)
        external
        onlyOwner
        notToZeroAddress(to)
    {
        for (uint256 i; i < tokens.length; ++i) {
            address token = tokens[i];
            uint256 tokenBalance = IERC20(token).balanceOf(address(this));
            IERC20(token).safeTransfer(to, tokenBalance);
            emit FundsRetrieved(token, to, tokenBalance);
        }
    }

    /// @notice Execute calls on behalf of contract in case of emergency
    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external onlyOwner returns (bool, bytes memory) {
        (bool success, bytes memory result) = _to.call{value: _value}(_data);
        return (success, result);
    }

    /// @notice Set approvals for the tokens used when swapping
    function setApprovals() external onlyOwner {
        IERC20(CRV_TOKEN).safeApprove(CURVE_CVXCRV_CRV_POOL, 0);
        IERC20(CRV_TOKEN).safeApprove(CURVE_CVXCRV_CRV_POOL, type(uint256).max);

        IERC20(CRV_TOKEN).safeApprove(CURVE_CRV_ETH_POOL, 0);
        IERC20(CRV_TOKEN).safeApprove(CURVE_CRV_ETH_POOL, type(uint256).max);

        IERC20(CRV_TOKEN).safeApprove(CVXCRV_DEPOSIT, 0);
        IERC20(CRV_TOKEN).safeApprove(CVXCRV_DEPOSIT, type(uint256).max);

        IERC20(CVXCRV_TOKEN).safeApprove(CURVE_CVXCRV_CRV_POOL, 0);
        IERC20(CVXCRV_TOKEN).safeApprove(
            CURVE_CVXCRV_CRV_POOL,
            type(uint256).max
        );

        IERC20(CVXCRV_TOKEN).safeApprove(CVXCRV_STAKING_CONTRACT, 0);
        IERC20(CVXCRV_TOKEN).safeApprove(
            CVXCRV_STAKING_CONTRACT,
            type(uint256).max
        );
    }

    /// @notice Swap a token for ETH on Curve
    /// @dev Needs the token to have been added to the registry with params
    /// @param token - address of the token to swap
    /// @param amount - amount of the token to swap
    function _swapToETHCurve(address token, uint256 amount) internal {
        curveSwapParams memory params = curveRegistry[token];
        require(params.pool != address(0));
        IERC20(token).safeApprove(params.pool, 0);
        IERC20(token).safeApprove(params.pool, amount);
        ICurveV2Pool(params.pool).exchange_underlying(
            params.ethIndex ^ 1,
            params.ethIndex,
            amount,
            0
        );
    }

    /// @notice Swap a token for ETH
    /// @param token - address of the token to swap
    /// @param amount - amount of the token to swap
    /// @dev Swaps are executed via Sushi or UniV2 router, will revert if pair
    /// does not exist. Tokens must have a WETH pair.
    function _swapToETH(
        address token,
        uint256 amount,
        address router
    ) internal notToZeroAddress(router) {
        address[] memory _path = new address[](2);
        _path[0] = token;
        _path[1] = WETH_TOKEN;

        IERC20(token).safeApprove(router, 0);
        IERC20(token).safeApprove(router, amount);

        IUniV2Router(router).swapExactTokensForETH(
            amount,
            1,
            _path,
            address(this),
            block.timestamp + 1
        );
    }

    /// @notice Swap a token for ETH on UniSwap V3
    /// @param token - address of the token to swap
    /// @param amount - amount of the token to swap
    /// @param fee - the pool's fee
    function _swapToETHUniV3(
        address token,
        uint256 amount,
        uint24 fee
    ) internal {
        IERC20(token).safeApprove(UNIV3_ROUTER, 0);
        IERC20(token).safeApprove(UNIV3_ROUTER, amount);
        IUniV3Router.ExactInputSingleParams memory _params = IUniV3Router
            .ExactInputSingleParams(
                token,
                WETH_TOKEN,
                fee,
                address(this),
                block.timestamp + 1,
                amount,
                1,
                0
            );
        uint256 _wethReceived = IUniV3Router(UNIV3_ROUTER).exactInputSingle(
            _params
        );
        IWETH(WETH_TOKEN).withdraw(_wethReceived);
    }

    function _isEffectiveOutputToken(address _token, uint32[] calldata _weights)
        internal
        returns (bool)
    {
        for (uint256 j; j < _weights.length; ++j) {
            if (_token == outputTokens[j] && _weights[j] > 0) {
                return true;
            }
        }
        return false;
    }

    /// @notice Claims all specified rewards from Votium
    /// @param claimParams - an array containing the info necessary to claim for
    /// each available token
    /// @dev Used to retrieve tokens that need to be transferred
    function claim(IMultiMerkleStash.claimParam[] calldata claimParams)
        public
        onlyOwner
    {
        require(claimParams.length > 0, "No claims");
        // claim all from votium
        IMultiMerkleStash(votiumDistributor).claimMulti(
            address(this),
            claimParams
        );
    }

    /// @notice Claims all specified rewards and swaps them to ETH
    /// @param claimParams - an array containing the info necessary to claim
    /// @param routerChoices - the router to use for the swap
    /// @param claimBeforeSwap - whether to claim on Votium or not
    /// @param minAmountOut - min output amount in ETH value
    /// @param gasRefund - tx gas cost to refund to caller (ETH amount)
    /// @param weights - weight of output assets (cvxCRV, FXS, CVX...) in bips
    /// @dev routerChoices is a 3-bit bitmap such that
    /// 0b000 (0) - Sushi
    /// 0b001 (1) - UniV2
    /// 0b010 (2) - UniV3 0.3%
    /// 0b011 (3) - UniV3 1%
    /// 0b100 (4) - Curve
    /// Ex: 136 = 010 001 000 will swap token 1 on UniV3, 2 on UniV3, last on Sushi
    /// Passing 0 will execute all swaps on sushi
    /// @dev claimBeforeSwap is used in case 3rd party already claimed on Votium
    /// @dev weights must sum to 10000
    /// @dev gasRefund is computed off-chain w/ tenderly
    function swap(
        IMultiMerkleStash.claimParam[] calldata claimParams,
        uint256 routerChoices,
        bool claimBeforeSwap,
        uint256 minAmountOut,
        uint256 gasRefund,
        uint32[] calldata weights
    ) public onlyOwner {
        require(weights.length == outputTokens.length, "Invalid weight length");
        // claim if applicable
        if (claimBeforeSwap) {
            claim(claimParams);
        }

        // swap all claims to ETH
        for (uint256 i; i < claimParams.length; ++i) {
            address _token = claimParams[i].token;
            uint256 _balance = IERC20(_token).balanceOf(address(this));
            // avoid wasting gas / reverting if no balance
            if (_balance <= 1) {
                continue;
            } else {
                // leave one gwei to lower future claim gas costs
                // https://twitter.com/libevm/status/1474870670429360129?s=21
                _balance -= 1;
            }
            // unwrap WETH
            if (_token == WETH_TOKEN) {
                IWETH(WETH_TOKEN).withdraw(_balance);
            }
            // we handle swaps for output tokens later when distributing
            // so any non-zero output token will be skipped here
            else {
                // skip if output token
                if (_isEffectiveOutputToken(_token, weights)) {
                    continue;
                }
                // otherwise execute the swaps
                uint256 _choice = routerChoices & 7;
                if (_choice >= 4) {
                    _swapToETHCurve(_token, _balance);
                } else if (_choice >= 2) {
                    _swapToETHUniV3(_token, _balance, fees[_choice - 2]);
                } else {
                    _swapToETH(_token, _balance, routers[_choice]);
                }
                routerChoices = routerChoices >> 3;
            }
        }

        // slippage check
        assert(address(this).balance > minAmountOut);

        (bool success, ) = (tx.origin).call{value: gasRefund}("");
        require(success, "ETH transfer failed");
    }

    /// @notice Internal function used to sell output tokens for ETH
    /// @param _token - the token to sell
    /// @param _amount - how much of that token to sell
    function _sell(address _token, uint256 _amount) internal {
        if (_token == CRV_TOKEN) {
            _crvToEth(_amount, 0);
        } else if (_token == CVX_TOKEN) {
            _swapToETHCurve(_token, _amount);
        } else {
            IERC20(_token).safeTransfer(tokenInfo[_token].swapper, _amount);
            ISwapper(tokenInfo[_token].swapper).sell(_amount);
        }
    }

    /// @notice Internal function used to buy output tokens from ETH
    /// @param _token - the token to sell
    /// @param _amount - how much of that token to sell
    function _buy(address _token, uint256 _amount) internal {
        if (_token == CRV_TOKEN) {
            _ethToCrv(_amount, 0);
        } else if (_token == CVX_TOKEN) {
            _ethToCvx(_amount, 0);
        } else {
            (bool success, ) = tokenInfo[_token].swapper.call{value: _amount}(
                ""
            );
            require(success, "ETH transfer failed");
            ISwapper(tokenInfo[_token].swapper).buy(_amount);
        }
    }

    /// @notice Swap or lock all CRV for cvxCRV
    /// @param _minAmountOut - the min amount of cvxCRV expected
    /// @param _lock - whether to lock or swap
    /// @return the amount of cvxCrv obtained
    function _toCvxCrv(uint256 _minAmountOut, bool _lock)
        internal
        returns (uint256)
    {
        uint256 _crvBalance = IERC20(CRV_TOKEN).balanceOf(address(this));
        // swap on Curve if there is a premium for doing so
        if (!_lock) {
            return _swapCrvToCvxCrv(_crvBalance, address(this), _minAmountOut);
        }
        // otherwise deposit & lock
        // slippage check
        assert(_crvBalance > _minAmountOut);
        ICvxCrvDeposit(CVXCRV_DEPOSIT).deposit(_crvBalance, true);
        return _crvBalance;
    }

    /// @notice Compute and takes fees if possible
    /// @dev If not enough ETH to take fees, can be applied on merkle distribution
    /// @param _totalEthBalance - the total ETH value of assets in the contract
    /// @return the ETH value of fees
    function _levyFees(uint256 _totalEthBalance) internal returns (uint256) {
        uint256 _feeAmount = (_totalEthBalance * platformFee) / DECIMALS;
        if (address(this).balance >= _feeAmount) {
            (bool success, ) = (platform).call{value: _feeAmount}("");
            require(success, "ETH transfer failed");
            return _feeAmount;
        }
        return 0;
    }

    function _balanceSalesAndBuy(
        bool lock,
        uint32[] calldata weights,
        uint32[] calldata adjustOrder,
        uint256[] calldata minAmounts,
        uint256[] memory prices,
        uint256[] memory amounts,
        uint256 _totalEthBalance
    ) internal {
        address _outputToken;
        uint256 _orderIndex;

        for (uint256 i; i < adjustOrder.length; ++i) {
            _orderIndex = adjustOrder[i];
            // if weight == 0, the token would have been swapped already so no balance
            if (weights[_orderIndex] > 0) {
                _outputToken = outputTokens[_orderIndex];
                // amount adjustments
                uint256 _desired = (_totalEthBalance * weights[_orderIndex]) /
                    DECIMALS;
                if (amounts[_orderIndex] > _desired) {
                    _sell(
                        _outputToken,
                        (((amounts[_orderIndex] - _desired) * 1e18) /
                            prices[_orderIndex])
                    );
                } else {
                    uint256 _swapAmount = _desired - amounts[_orderIndex];
                    if (i == adjustOrder.length - 1) {
                        _swapAmount = address(this).balance;
                    }
                    _buy(_outputToken, _swapAmount);
                }
                // we need an edge case here since it's too late
                // to update the cvxCRV distributor's stake function
                if (_outputToken == CRV_TOKEN) {
                    // convert all CRV to cvxCRV
                    _toCvxCrv(minAmounts[_orderIndex], lock);
                } else {
                    // slippage check
                    assert(
                        IERC20(_outputToken).balanceOf(address(this)) >
                            minAmounts[_orderIndex]
                    );
                }
            }
        }
    }

    /// @notice Splits contract balance into output tokens as per weights
    /// @param lock - whether to lock or swap crv to cvxcrv
    /// @param weights - weight of output assets (cvxCRV, FXS, CVX) in bips
    /// @param adjustOrder - order in which to process output tokens when adjusting
    /// @param minAmounts - min amount out of each output token (cvxCRV for CRV)
    /// @dev weights must sum to 10000
    /// @dev for adjustOrder token to be processed first should have smallest weight
    ///      but largest balance in contract.
    function adjust(
        bool lock,
        uint32[] calldata weights,
        uint32[] calldata adjustOrder,
        uint256[] calldata minAmounts
    ) public onlyOwner validWeights(weights) {
        require(
            minAmounts.length == outputTokens.length,
            "Invalid min amounts"
        );
        require(
            adjustOrder.length == outputTokens.length,
            "Invalid order length"
        );
        // start calculating the allocations of output tokens
        uint256 _totalEthBalance = address(this).balance;

        uint256[] memory prices = new uint256[](outputTokens.length);
        uint256[] memory amounts = new uint256[](outputTokens.length);
        address _outputToken;

        // first loop to calculate total ETH amounts and store oracle prices
        for (uint256 i; i < weights.length; ++i) {
            if (weights[i] > 0) {
                _outputToken = outputTokens[i];
                prices[i] = ICurveV2Pool(tokenInfo[_outputToken].pool)
                    .price_oracle();
                // compute ETH value of current token balance
                amounts[i] =
                    (IERC20(_outputToken).balanceOf(address(this)) *
                        prices[i]) /
                    1e18;
                // add the ETH value of token to current ETH value in contract
                _totalEthBalance += amounts[i];
            }
        }

        // deduce fees if applicable
        _totalEthBalance -= _levyFees(_totalEthBalance);

        // second loop to balance the amounts with buys and sells before distribution
        // according to order of liquidation specified in adjustOrder
        _balanceSalesAndBuy(
            lock,
            weights,
            adjustOrder,
            minAmounts,
            prices,
            amounts,
            _totalEthBalance
        );
    }

    /// @notice Deposits rewards to their respective merkle distributors
    /// @param weights - weights of output assets (cvxCRV, FXS, CVX...)
    function distribute(uint32[] calldata weights)
        public
        onlyOwner
        validWeights(weights)
    {
        for (uint256 i; i < weights.length; ++i) {
            if (weights[i] > 0) {
                address _outputToken = outputTokens[i];
                address _distributor = tokenInfo[_outputToken].distributor;
                IMerkleDistributorV2(_distributor).freeze();
                // edge case for CRV as we gotta keep using existing distributor
                if (_outputToken == CRV_TOKEN) {
                    _outputToken = CVXCRV_TOKEN;
                }
                uint256 _balance = IERC20(_outputToken).balanceOf(
                    address(this)
                );
                // transfer to distributor
                IERC20(_outputToken).safeTransfer(_distributor, _balance);
                // stake
                IMerkleDistributorV2(_distributor).stake();
                emit Distributed(_balance, _outputToken, _distributor);
            }
        }
    }

    /// @notice Swaps all bribes, adjust according to output token weights and distribute
    /// @dev Wrapper over the swap, adjust & distribute function
    /// @param claimParams - an array containing the info necessary to claim
    /// @param routerChoices - the router to use for the swap
    /// @param claimBeforeSwap - whether to claim on Votium or not
    /// @param gasRefund - tx gas cost to refund to caller (ETH amount)
    /// @param weights - weight of output assets (cvxCRV, FXS, CVX...) in bips
    /// @param adjustOrder - order in which to process output tokens when adjusting
    /// @param minAmounts - min amount out of each output token (cvxCRV for CRV)
    function processIncentives(
        IMultiMerkleStash.claimParam[] calldata claimParams,
        uint256 routerChoices,
        bool claimBeforeSwap,
        bool lock,
        uint256 gasRefund,
        uint32[] calldata weights,
        uint32[] calldata adjustOrder,
        uint256[] calldata minAmounts
    ) external onlyOwner {
        require(
            minAmounts.length == outputTokens.length,
            "Invalid min amounts"
        );
        swap(
            claimParams,
            routerChoices,
            claimBeforeSwap,
            0,
            gasRefund,
            weights
        );
        adjust(lock, weights, adjustOrder, minAmounts);
        distribute(weights);
    }

    receive() external payable {
        emit Received(msg.sender, msg.value);
    }

    modifier validWeights(uint32[] calldata _weights) {
        require(
            _weights.length == outputTokens.length,
            "Invalid weight length"
        );
        uint256 _totalWeights;
        for (uint256 i; i < _weights.length; ++i) {
            _totalWeights += _weights[i];
        }
        require(_totalWeights == DECIMALS, "Invalid weights");
        _;
    }
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "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;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    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'
        // solhint-disable-next-line max-line-length
        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));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    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");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @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");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}

// File: Address.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 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://diligence.consensys.net/posts/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/v0.5.11/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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: IMultiMerkleStash.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IMultiMerkleStash {
    struct claimParam {
        address token;
        uint256 index;
        uint256 amount;
        bytes32[] merkleProof;
    }

    function isClaimed(address token, uint256 index)
        external
        view
        returns (bool);

    function claim(
        address token,
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof
    ) external;

    function claimMulti(address account, claimParam[] calldata claims) external;

    function updateMerkleRoot(address token, bytes32 _merkleRoot) external;

    event Claimed(
        address indexed token,
        uint256 index,
        uint256 amount,
        address indexed account,
        uint256 indexed update
    );
    event MerkleRootUpdated(
        address indexed token,
        bytes32 indexed merkleRoot,
        uint256 indexed update
    );
}

// File: IMerkleDistributorV2.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IMerkleDistributorV2 {
    enum Option {
        Claim,
        ClaimAsETH,
        ClaimAsCRV,
        ClaimAsCVX,
        ClaimAndStake
    }

    function vault() external view returns (address);

    function merkleRoot() external view returns (bytes32);

    function week() external view returns (uint32);

    function frozen() external view returns (bool);

    function isClaimed(uint256 index) external view returns (bool);

    function setApprovals() external;

    function claim(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof
    ) external;

    function claimAs(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        Option option
    ) external;

    function claimAs(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        Option option,
        uint256 minAmountOut
    ) external;

    function freeze() external;

    function unfreeze() external;

    function stake() external;

    function updateMerkleRoot(bytes32 newMerkleRoot, bool unfreeze) external;

    function updateDepositor(address newDepositor) external;

    function updateAdmin(address newAdmin) external;

    function updateVault(address newVault) external;

    event Claimed(
        uint256 index,
        uint256 amount,
        address indexed account,
        uint256 indexed week,
        Option option
    );

    event DepositorUpdated(
        address indexed oldDepositor,
        address indexed newDepositor
    );

    event AdminUpdated(address indexed oldAdmin, address indexed newAdmin);

    event VaultUpdated(address indexed oldVault, address indexed newVault);

    event MerkleRootUpdated(bytes32 indexed merkleRoot, uint32 indexed week);
}

// File: IUniV2Router.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IUniV2Router {
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function getAmountsOut(uint256 amountIn, address[] memory path)
        external
        view
        returns (uint256[] memory amounts);
}

// File: IWETH.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IWETH {
    function deposit() external payable;

    function transfer(address to, uint256 value) external returns (bool);

    function withdraw(uint256) external;
}

// File: ICvxCrvDeposit.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface ICvxCrvDeposit {
    function deposit(uint256, bool) external;
}

// File: IVotiumRegistry.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IVotiumRegistry {
    struct Registry {
        uint256 start;
        address to;
        uint256 expiration;
    }

    function registry(address _from)
        external
        view
        returns (Registry memory registry);

    function setRegistry(address _to) external;
}

// File: IUniV3Router.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IUniV3Router {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    function exactInputSingle(ExactInputSingleParams calldata params)
        external
        payable
        returns (uint256 amountOut);

    struct ExactInputParams {
        bytes path;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
    }

    function exactInput(ExactInputParams calldata params)
        external
        payable
        returns (uint256 amountOut);
}

// File: ICurveV2Pool.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface ICurveV2Pool {
    function get_dy(
        uint256 i,
        uint256 j,
        uint256 dx
    ) external view returns (uint256);

    function calc_token_amount(uint256[2] calldata amounts)
        external
        view
        returns (uint256);

    function exchange_underlying(
        uint256 i,
        uint256 j,
        uint256 dx,
        uint256 min_dy
    ) external payable returns (uint256);

    function add_liquidity(uint256[2] calldata amounts, uint256 min_mint_amount)
        external
        returns (uint256);

    function lp_price() external view returns (uint256);

    function price_oracle() external view returns (uint256);

    function remove_liquidity_one_coin(
        uint256 token_amount,
        uint256 i,
        uint256 min_amount,
        bool use_eth,
        address receiver
    ) external returns (uint256);
}

// File: ISwapper.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface ISwapper {
    function buy(uint256 amount) external returns (uint256);

    function sell(uint256 amount) external returns (uint256);
}

// File: UnionBase.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "ICurveV2Pool.sol";
import "ICurveFactoryPool.sol";
import "IBasicRewards.sol";

// Common variables and functions
contract UnionBase {
    address public constant CVXCRV_STAKING_CONTRACT =
        0x3Fe65692bfCD0e6CF84cB1E7d24108E434A7587e;
    address public constant CURVE_CRV_ETH_POOL =
        0x8301AE4fc9c624d1D396cbDAa1ed877821D7C511;
    address public constant CURVE_CVX_ETH_POOL =
        0xB576491F1E6e5E62f1d8F26062Ee822B40B0E0d4;
    address public constant CURVE_CVXCRV_CRV_POOL =
        0x9D0464996170c6B9e75eED71c68B99dDEDf279e8;

    address public constant CRV_TOKEN =
        0xD533a949740bb3306d119CC777fa900bA034cd52;
    address public constant CVXCRV_TOKEN =
        0x62B9c7356A2Dc64a1969e19C23e4f579F9810Aa7;
    address public constant CVX_TOKEN =
        0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B;

    uint256 public constant CRVETH_ETH_INDEX = 0;
    uint256 public constant CRVETH_CRV_INDEX = 1;
    int128 public constant CVXCRV_CRV_INDEX = 0;
    int128 public constant CVXCRV_CVXCRV_INDEX = 1;
    uint256 public constant CVXETH_ETH_INDEX = 0;
    uint256 public constant CVXETH_CVX_INDEX = 1;

    IBasicRewards cvxCrvStaking = IBasicRewards(CVXCRV_STAKING_CONTRACT);
    ICurveV2Pool cvxEthSwap = ICurveV2Pool(CURVE_CVX_ETH_POOL);
    ICurveV2Pool crvEthSwap = ICurveV2Pool(CURVE_CRV_ETH_POOL);
    ICurveFactoryPool crvCvxCrvSwap = ICurveFactoryPool(CURVE_CVXCRV_CRV_POOL);

    /// @notice Swap CRV for cvxCRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @return amount of CRV obtained after the swap
    function _swapCrvToCvxCrv(uint256 amount, address recipient)
        internal
        returns (uint256)
    {
        return _crvToCvxCrv(amount, recipient, 0);
    }

    /// @notice Swap CRV for cvxCRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapCrvToCvxCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return _crvToCvxCrv(amount, recipient, minAmountOut);
    }

    /// @notice Swap CRV for cvxCRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _crvToCvxCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return
            crvCvxCrvSwap.exchange(
                CVXCRV_CRV_INDEX,
                CVXCRV_CVXCRV_INDEX,
                amount,
                minAmountOut,
                recipient
            );
    }

    /// @notice Swap cvxCRV for CRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @return amount of CRV obtained after the swap
    function _swapCvxCrvToCrv(uint256 amount, address recipient)
        internal
        returns (uint256)
    {
        return _cvxCrvToCrv(amount, recipient, 0);
    }

    /// @notice Swap cvxCRV for CRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapCvxCrvToCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return _cvxCrvToCrv(amount, recipient, minAmountOut);
    }

    /// @notice Swap cvxCRV for CRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _cvxCrvToCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return
            crvCvxCrvSwap.exchange(
                CVXCRV_CVXCRV_INDEX,
                CVXCRV_CRV_INDEX,
                amount,
                minAmountOut,
                recipient
            );
    }

    /// @notice Swap CRV for native ETH on Curve
    /// @param amount - amount to swap
    /// @return amount of ETH obtained after the swap
    function _swapCrvToEth(uint256 amount) internal returns (uint256) {
        return _crvToEth(amount, 0);
    }

    /// @notice Swap CRV for native ETH on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of ETH obtained after the swap
    function _swapCrvToEth(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return _crvToEth(amount, minAmountOut);
    }

    /// @notice Swap CRV for native ETH on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of ETH obtained after the swap
    function _crvToEth(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return
            crvEthSwap.exchange_underlying{value: 0}(
                CRVETH_CRV_INDEX,
                CRVETH_ETH_INDEX,
                amount,
                minAmountOut
            );
    }

    /// @notice Swap native ETH for CRV on Curve
    /// @param amount - amount to swap
    /// @return amount of CRV obtained after the swap
    function _swapEthToCrv(uint256 amount) internal returns (uint256) {
        return _ethToCrv(amount, 0);
    }

    /// @notice Swap native ETH for CRV on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapEthToCrv(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return _ethToCrv(amount, minAmountOut);
    }

    /// @notice Swap native ETH for CRV on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _ethToCrv(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return
            crvEthSwap.exchange_underlying{value: amount}(
                CRVETH_ETH_INDEX,
                CRVETH_CRV_INDEX,
                amount,
                minAmountOut
            );
    }

    /// @notice Swap native ETH for CVX on Curve
    /// @param amount - amount to swap
    /// @return amount of CRV obtained after the swap
    function _swapEthToCvx(uint256 amount) internal returns (uint256) {
        return _ethToCvx(amount, 0);
    }

    /// @notice Swap native ETH for CVX on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapEthToCvx(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return _ethToCvx(amount, minAmountOut);
    }

    /// @notice Swap native ETH for CVX on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _ethToCvx(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return
            cvxEthSwap.exchange_underlying{value: amount}(
                CVXETH_ETH_INDEX,
                CVXETH_CVX_INDEX,
                amount,
                minAmountOut
            );
    }

    modifier notToZeroAddress(address _to) {
        require(_to != address(0), "Invalid address!");
        _;
    }
}

// File: ICurveFactoryPool.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface ICurveFactoryPool {
    function get_dy(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256);

    function get_balances() external view returns (uint256[2] memory);

    function add_liquidity(
        uint256[2] memory _amounts,
        uint256 _min_mint_amount,
        address _receiver
    ) external returns (uint256);

    function exchange(
        int128 i,
        int128 j,
        uint256 _dx,
        uint256 _min_dy,
        address _receiver
    ) external returns (uint256);
}

// File: IBasicRewards.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.9;

interface IBasicRewards {
    function stakeFor(address, uint256) external returns (bool);

    function balanceOf(address) external view returns (uint256);

    function earned(address) external view returns (uint256);

    function withdrawAll(bool) external returns (bool);

    function withdraw(uint256, bool) external returns (bool);

    function withdrawAndUnwrap(uint256 amount, bool claim)
        external
        returns (bool);

    function getReward() external returns (bool);

    function stake(uint256) external returns (bool);

    function extraRewards(uint256) external view returns (address);

    function exit() external returns (bool);
}