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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

// Contracts
import { SafeTransferLib, ERC20 } from "solmate/utils/SafeTransferLib.sol";
import { UUPSUpgradeable } from "../proxy/UUPSUpgradeable.sol";
import { Ownable } from "../common/utils/Ownable.sol";

// Interfaces
import { ICurve3Pool } from "./interfaces/ICurve3Pool.sol";
import { IBooster } from "./interfaces/IBooster.sol";
import { IBaseRewardPool } from "./interfaces/IBaseRewardPool.sol";
import { ICvxRewardPool } from "./interfaces/ICvxRewardPool.sol";
import { ICrvDepositor } from "./interfaces/ICrvDepositor.sol";
import { ITreasury } from "./interfaces/ITreasury.sol";
import { IERC20 } from "../common/interfaces/IERC20.sol";
import { IUSXAdmin } from "../common/interfaces/IUSXAdmin.sol";

contract Treasury is Ownable, UUPSUpgradeable, ITreasury {
    // Private Constants: no SLOAD to save users gas
    address private constant BACKING_TOKEN = 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490; // 3CRV
    address private constant CURVE_3POOL = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7;
    address private constant CRV = 0xD533a949740bb3306d119CC777fa900bA034cd52;
    address private constant CVX = 0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B;
    address private constant BOOSTER = 0xF403C135812408BFbE8713b5A23a04b3D48AAE31;
    address private constant CRV_DEPOSITOR = 0x8014595F2AB54cD7c604B00E9fb932176fDc86Ae;
    address private constant CVX3CRV_BASE_REWARD_POOL = 0x689440f2Ff927E1f24c72F1087E1FAF471eCe1c8;
    address private constant CVXCRV_BASE_REWARD_POOL = 0x3Fe65692bfCD0e6CF84cB1E7d24108E434A7587e;
    address private constant CVX_REWARD_POOL = 0xCF50b810E57Ac33B91dCF525C6ddd9881B139332;
    address private constant DEPLOYER = 0xd3e7A213D97D8C9630Cef49e715E1156B0385603;
    uint8 private constant PID_3POOL = 9;

    // Storage Variables: follow storage slot restrictions
    struct SupportedStable {
        bool supported;
        int128 curveIndex;
    }

    mapping(address => SupportedStable) public supportedStables;
    address public usx;
    uint256 public previousLpTokenPrice;
    uint256 public totalSupply;

    // Events
    event Mint(address indexed account, uint256 amount);
    event Redemption(address indexed account, uint256 amount);

    function initialize(address _usx) public initializer {
        /// @dev No constructor, so initialize Ownable explicitly.
        require(msg.sender == DEPLOYER, "Invalid caller.");
        __Ownable_init();
        usx = _usx;
    }

    /// @dev Required by the UUPS module.
    function _authorizeUpgrade(address) internal override onlyOwner { }

    /**
     * @dev This function deposits any one of the supported stablecoins to Curve,
     * receives 3CRV tokens in exchange, and mints the USX token, such that it's
     * valued at approximately one US dollar.
     * @param _stable The address of the input token used to mint USX.
     * @param _amount The amount of the input token used to mint USX.
     */
    function mint(address _stable, uint256 _amount) public {
        require(_amount != 0, "Amount cannot be zero.");
        require(supportedStables[_stable].supported || _stable == BACKING_TOKEN, "Unsupported stable.");

        SafeTransferLib.safeTransferFrom(ERC20(_stable), msg.sender, address(this), _amount);

        uint256 lpTokenAmount;
        if (_stable != BACKING_TOKEN) {
            lpTokenAmount = __provideLiquidity(_stable, _amount);
        } else {
            lpTokenAmount = _amount;
        }

        __stakeLpTokens(lpTokenAmount);

        uint256 mintAmount = __getMintAmount(lpTokenAmount);

        totalSupply += mintAmount;
        IUSXAdmin(usx).mint(msg.sender, mintAmount);
        emit Mint(msg.sender, mintAmount);
    }

    /**
     * @dev This function facilitates redeeming a single supported stablecoin, in
     * exchange for USX tokens, such that USX is valued at approximately one US dollar.
     * @param _stable The address of the token to withdraw.
     * @param _amount The amount of USX tokens to burn upon redemption.
     */
    function redeem(address _stable, uint256 _amount) public {
        require(_amount != 0, "Amount cannot be zero.");
        require(supportedStables[_stable].supported || _stable == BACKING_TOKEN, "Unsupported stable.");

        uint256 lpTokenAmount = __getLpTokenAmount(_amount);

        __unstakeLpTokens(lpTokenAmount);

        uint256 redeemAmount;
        if (_stable != BACKING_TOKEN) {
            redeemAmount = __removeLiquidity(_stable, lpTokenAmount);
        } else {
            redeemAmount = lpTokenAmount;
        }

        SafeTransferLib.safeTransfer(ERC20(_stable), msg.sender, redeemAmount);

        totalSupply -= _amount;
        IUSXAdmin(usx).burn(msg.sender, _amount);
        emit Redemption(msg.sender, _amount);
    }

    function __provideLiquidity(address _stable, uint256 _amount) private returns (uint256 lpTokenAmount) {
        // Obtain contract's LP token balance before adding liquidity
        uint256 preBalance = IERC20(BACKING_TOKEN).balanceOf(address(this));

        // Add liquidity to Curve
        SafeTransferLib.safeApprove(ERC20(_stable), CURVE_3POOL, _amount);
        uint256[3] memory amounts;
        amounts[uint256(uint128(supportedStables[_stable].curveIndex))] = _amount;
        ICurve3Pool(CURVE_3POOL).add_liquidity(amounts, 0);

        // Calculate the amount of LP tokens received from adding liquidity
        lpTokenAmount = IERC20(BACKING_TOKEN).balanceOf(address(this)) - preBalance;
    }

    function __removeLiquidity(address _stable, uint256 _lpTokenAmount) private returns (uint256 redeemAmount) {
        // Obtain contract's withdrawal token balance before removing liquidity
        uint256 preBalance = IERC20(_stable).balanceOf(address(this));

        // Remove liquidity from Curve
        ICurve3Pool(CURVE_3POOL).remove_liquidity_one_coin(_lpTokenAmount, supportedStables[_stable].curveIndex, 0);

        // Calculate the amount of stablecoin received from removing liquidity
        redeemAmount = IERC20(_stable).balanceOf(address(this)) - preBalance;
    }

    function __stakeLpTokens(uint256 _amount) private {
        // Approve Booster to spend Treasury's 3CRV
        SafeTransferLib.safeApprove(ERC20(BACKING_TOKEN), BOOSTER, _amount);

        // Deposit 3CRV into Booster and have it stake cvx3CRV into BaseRewardPool on Treasury's behalf
        IBooster(BOOSTER).deposit(PID_3POOL, _amount, true);
    }

    function __unstakeLpTokens(uint256 _amount) private {
        // Unstake cvx3CRV, unwrap it into 3RCV, and claim all rewards
        IBaseRewardPool(CVX3CRV_BASE_REWARD_POOL).withdrawAndUnwrap(_amount, true);
    }

    function __getMintAmount(uint256 _lpTokenAmount) private returns (uint256 mintAmount) {
        // Call reentrancy-guarded function
        ICurve3Pool(CURVE_3POOL).remove_liquidity(0, [uint256(0), uint256(0), uint256(0)]);

        uint256 lpTokenPrice = ICurve3Pool(CURVE_3POOL).get_virtual_price();

        // Curve invariant dictates that lpTokenPrice should consistently increase over time.
        require(lpTokenPrice >= previousLpTokenPrice, "Curve invariant violation.");

        previousLpTokenPrice = lpTokenPrice;

        mintAmount = (_lpTokenAmount * lpTokenPrice) / 1e18;
    }

    function __getLpTokenAmount(uint256 _amount) private returns (uint256 lpTokenAmount) {
        // Call reentrancy-guarded function
        ICurve3Pool(CURVE_3POOL).remove_liquidity(0, [uint256(0), uint256(0), uint256(0)]);

        uint256 lpTokenPrice = ICurve3Pool(CURVE_3POOL).get_virtual_price();

        // Curve invariant dictates that lpTokenPrice should consistently increase over time.
        // If invariant is ever violated, USX will decrease in price, but holders will still
        // be able to redeem.
        if (lpTokenPrice < previousLpTokenPrice) {
            lpTokenPrice = previousLpTokenPrice;
        } else {
            previousLpTokenPrice = lpTokenPrice;
        }

        uint256 conversionFactor = (1e18 * 1e18 / lpTokenPrice);
        lpTokenAmount = (_amount * conversionFactor) / 1e18;
    }

    /* ****************************************************************************
    **
    **  Admin Functions
    **
    ******************************************************************************/

    /**
     * @dev Allow contract admins to add supported stablecoins.
     * @param _stable The address of stablecoin to add.
     * @param _curveIndex The stablecoin's Curve-assigned index.
     */
    function addSupportedStable(address _stable, int128 _curveIndex) public onlyOwner {
        supportedStables[_stable] = SupportedStable(true, _curveIndex);
    }

    /**
     * @dev Allow contract admins to remove supported stablecoins.
     * @param _stable The address of stablecoin to remove.
     */
    function removeSupportedStable(address _stable) public onlyOwner {
        delete supportedStables[_stable];
    }

    /**
     * @dev Allow contract admins to swap the backing token to a supported stable, in an emergency.
     * For example, if the Curve invariant is violated, admins may need to swap the backing token to
     * protect the USX peg to the US dollar.
     */
    function emergencySwapBacking(address _newBackingToken) public onlyOwner {
        require(supportedStables[_newBackingToken].supported, "Token not supported.");

        // Withdraw all staked 3CRV
        uint256 totalStaked = IBaseRewardPool(CVX3CRV_BASE_REWARD_POOL).balanceOf(address(this));
        __unstakeLpTokens(totalStaked);

        // Remove liquidity from Curve, receiving _newBackingToken
        ICurve3Pool(CURVE_3POOL).remove_liquidity_one_coin(
            totalStaked, supportedStables[_newBackingToken].curveIndex, 0
        );

        // Pause minting and redeeming
        IUSXAdmin(usx).treasuryKillSwitch();

        // This contract is now backed by _newBackingToken, but BACKING_TOKEN was not updated, because it's a constant.
        // Admins may need to update BACKING_TOKEN via proxy upgrade, depending on the post-emergency-swap resolution.
    }

    /**
     * @dev Allow contract admins to extract any non-backing ERC20 token.
     * @param _token The address of token to remove.
     */
    function extractERC20(address _token) public onlyOwner {
        uint256 balance = IERC20(_token).balanceOf(address(this));

        SafeTransferLib.safeTransfer(ERC20(_token), msg.sender, balance);
    }

    /**
     * @dev Allow contract admins to extract native token.
     */
    function extractNative() public onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }

    /**
     * @dev Allow contract admins to stake CVX into CVX_REWARD_POOL contract. This will
     * accumulate cvxCRV rewards proportionate to the amount staked.
     * @param _amount The amount of CVX to stake.
     */
    function stakeCvx(uint256 _amount) public onlyOwner {
        uint256 balance = IERC20(CVX).balanceOf(address(this));

        require(balance != 0 && balance >= _amount, "Insufficient CVX balance.");

        SafeTransferLib.safeApprove(ERC20(CVX), CVX_REWARD_POOL, _amount);

        ICvxRewardPool(CVX_REWARD_POOL).stake(_amount);
    }

    /**
     * @dev Allow contract admins to withdraw CVX from CVX_REWARD_POOL contract and claim all
     * unclaimed cvxCRV rewards.
     * @param _amount The amount of CVX to withdraw.
     */
    function unstakeCvx(uint256 _amount) public onlyOwner {
        uint256 stakedAmount = ICvxRewardPool(CVX_REWARD_POOL).balanceOf(address(this));

        require(stakedAmount != 0 && stakedAmount >= _amount, "Amount exceeds staked balance.");

        ICvxRewardPool(CVX_REWARD_POOL).withdraw(_amount, true);
    }

    /**
     * @dev Allow contract admins to claim all unclaimed cvxCRV rewards from CVX_REWARD_POOL contract.
     * @param _stake If true, all claimed cvxCRV rewards will be staked into CVXCRV_BASE_REWARD_POOL.
     */
    function claimRewardCvx(bool _stake) public onlyOwner {
        require(ICvxRewardPool(CVX_REWARD_POOL).earned(address(this)) != 0, "No rewards to claim.");

        ICvxRewardPool(CVX_REWARD_POOL).getReward(_stake);
    }

    /**
     * @dev Allow contract admins to deposit CRV into CrvDepositor, convert it to cvxCRV, and stake the
     * corresponding cvxCRV into CVXCRV_BASE_REWARD_POOL. This will accumulate CVX, CRV, and 3CRV
     * rewards proportionate to the amount staked.
     * @param _amount The amount of CRV to deposit, convert, and stake.
     */
    function stakeCrv(uint256 _amount) public onlyOwner {
        require(_amount != 0, "Amount cannot be zero.");
        require(IERC20(CRV).balanceOf(address(this)) >= _amount, "Insufficient CRV balance.");

        SafeTransferLib.safeApprove(ERC20(CRV), CRV_DEPOSITOR, _amount);

        ICrvDepositor(CRV_DEPOSITOR).deposit(_amount, true, CVXCRV_BASE_REWARD_POOL);
    }

    /**
     * @dev Allow contract admins to withdraw cvxCRV from CVXCRV_BASE_REWARD_POOL and claim all
     * unclaimed CVX, CRV, and 3CRV rewards.
     * @param _amount The amount of cvxCRV to withdraw.
     */
    function unstakeCvxCrv(uint256 _amount) public onlyOwner {
        uint256 stakedAmount = IBaseRewardPool(CVXCRV_BASE_REWARD_POOL).balanceOf(address(this));

        require(stakedAmount != 0 && stakedAmount >= _amount, "Amount exceeds staked balance.");

        IBaseRewardPool(CVXCRV_BASE_REWARD_POOL).withdraw(_amount, true);
    }

    /**
     * @dev Allow contract admins to claim all unclaimed CVX, CRV, and 3CRV rewards from CVXCRV_BASE_REWARD_POOL.
     */
    function claimRewardCvxCrv() public onlyOwner {
        require(IBaseRewardPool(CVXCRV_BASE_REWARD_POOL).earned(address(this)) != 0, "No rewards to claim.");

        IBaseRewardPool(CVXCRV_BASE_REWARD_POOL).getReward();
    }

    /**
     * @dev Allow contract admins to deposit 3CRV into Booster, convert it to cvx3CRV, and
     * stake the corresponding cvx3CRV into CVX3CRV_BASE_REWARD_POOL. This will accumulate
     * CVX and CRV rewards proportionate to the amount staked.
     * @param _amount The amount of 3CRV to deposit, convert, and stake.
     */
    function stake3Crv(uint256 _amount) public onlyOwner {
        uint256 balance = IERC20(BACKING_TOKEN).balanceOf(address(this));

        require(balance != 0 && balance >= _amount, "Insufficient 3CRV balance.");

        __stakeLpTokens(_amount);
    }

    /**
     * @dev Allow contract admins to withdraw cvx3CRV from CVX3CRV_BASE_REWARD_POOL, unwrap it into 3CRV,
     * and claim all unclaimed CVX and CRV rewards.
     * @param _amount The amount of cvx3CRV to withdraw.
     */
    function unstake3Crv(uint256 _amount) public onlyOwner {
        uint256 balanceCvx3Crv = IBaseRewardPool(CVX3CRV_BASE_REWARD_POOL).balanceOf(address(this));
        uint256 backingAmount = __getLpTokenAmount(totalSupply);

        require(_amount <= balanceCvx3Crv - backingAmount, "Cannot withdraw backing cvx3CRV.");

        __unstakeLpTokens(_amount);
    }

    /**
     * @dev Allow contract admins to claim all unclaimed CVX and CRV rewards from CVX3CRV_BASE_REWARD_POOL.
     */
    function claimRewardCvx3Crv() public onlyOwner {
        require(IBaseRewardPool(CVX3CRV_BASE_REWARD_POOL).earned(address(this)) != 0, "No rewards to claim.");

        IBaseRewardPool(CVX3CRV_BASE_REWARD_POOL).getReward();
    }

    receive() external payable { }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage slots in the inheritance chain.
     * Storage slot management is necessary, as we're using an upgradable proxy contract.
     * For details, see: https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

interface IERC165 {
    /// @notice Query if a contract implements an interface
    /// @param interfaceID The interface identifier, as specified in ERC-165
    /// @dev Interface identification is specified in ERC-165. This function
    ///  uses less than 30,000 gas.
    /// @return `true` if the contract implements `interfaceID` and
    ///  `interfaceID` is not 0xffffffff, `false` otherwise
    function supportsInterface(bytes4 interfaceID) external view returns (bool);
}

// SPDX-License-Identifier: MIT

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

pragma solidity >=0.8.0;

import { IERC20 } from "./IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.2;

import { IERC165 } from "./IERC165.sol";
import { IERC20Metadata } from "../../common/interfaces/IERC20Metadata.sol";

/**
 * @dev Interface of the Omnichain ERC20 standard
 */
interface IOERC20 is IERC165, IERC20Metadata {
    /**
     * @dev send _amount amount of token to (`_dstChainId`, `_toAddress`) from `_from`
     * @param _bridgeAddress - the Ax-assigned bridge ID, which dictates the message passing protocol to use
     * @param _from - the owner of token
     * @param _dstChainId - the destination chain identifier
     * @param _toAddress - can be any size depending on the `dstChainId`
     * @param _amount - the quantity of tokens in wei
     */
    function sendFrom(
        address _bridgeAddress,
        address payable _from,
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount
    ) external payable returns (uint64 sequence);

    /**
     * @dev returns the circulating amount of tokens on current chain
     */
    function circulatingSupply() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import { IERC20 } from "./IERC20.sol";

/**
 * @dev Extends IERC20 to include permit functionality
 */
interface IUERC20 is IERC20 {
    /**
     * @dev nonces is mapping given for replay protection.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     */
    function nonces(address owner) external returns (uint256);

    /**
     * @dev Hash of a structed defined in EIP-712; it's used for replay protection.
     *
     * Returns the hash.
     */
    function DOMAIN_SEPARATOR() external returns (bytes32);

    /**
     * @dev Allows abstraction of ERC-20 approval method.
     */
    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external;
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.8.0;

import { IOERC20 } from "./IOERC20.sol";

interface IUSX is IOERC20 {
    function mint(address _account, uint256 _amount) external;

    function burn(address _account, uint256 _amount) external;
}

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

import { IUSX } from "./IUSX.sol";
import { IUERC20 } from "./IUERC20.sol";

interface IUSXAdmin is IUSX, IUERC20 {
    error Paused();

    function treasuryKillSwitch() external;

    function upgradeTo(address newImplementation) external;

    function manageTreasuries(address _treasury, bool _mint, bool _burn) external;

    function treasuries(address _treasury) external returns (bool mint, bool burn);

    function manageCrossChainTransfers(address[2] calldata _bridgeAddresses, bool[2] calldata _privileges) external;

    function transferPrivileges(address _bridge) external returns (bool);

    function extractERC20(address _token) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import "./Initializable.sol";

/**
 * @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 is Initializable {
    function __Context_init() internal onlyInitializing { }

    function __Context_init_unchained() internal onlyInitializing { }

    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage slots in the inheritance chain.
     * Storage slot management is necessary, as we're using an upgradable proxy contract.
     * For details, see: https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import "../../libraries/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 * function initialize() initializer public {
 * __ERC20_init("MyToken", "MTK");
 * }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 * function initializeV2() reinitializer(2) public {
 * __ERC20Permit_init("MyToken");
 * }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 * _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private __initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private __initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !__initializing;
        require(
            (isTopLevelCall && __initialized < 1) || (!Address._isContract(address(this)) && __initialized == 1),
            "Initializable: contract is already initialized"
        );
        __initialized = 1;
        if (isTopLevelCall) {
            __initializing = true;
        }
        _;
        if (isTopLevelCall) {
            __initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!__initializing && __initialized < version, "Initializable: contract is already initialized");
        __initialized = version;
        __initializing = true;
        _;
        __initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(__initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!__initializing, "Initializable: contract is initializing");
        if (__initialized < type(uint8).max) {
            __initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `__initialized`
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return __initialized;
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `__initializing`
     */
    function _isInitializing() internal view returns (bool) {
        return __initializing;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage slots in the inheritance chain.
     * Storage slot management is necessary, as we're using an upgradable proxy contract.
     * For details, see: https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import "./Initializable.sol";
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 Initializable, Context {
    address private __owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = __owner;
        __owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage slots in the inheritance chain.
     * Storage slot management is necessary, as we're using an upgradable proxy contract.
     * For details, see: https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// 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
     * ====
     *
     * [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://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");

        (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

pragma solidity >=0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function _getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function _getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function _getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function _getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import "./interfaces/IBeacon.sol";
import "../libraries/Address.sol";
import "../libraries/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 */
abstract contract ERC1967Upgrade {
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant __ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlot._getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function __setImplementation(address newImplementation) private {
        require(Address._isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlot._getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        __setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            Address._functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallSecure(address newImplementation, bytes memory data, bool forceCall) internal {
        address oldImplementation = _getImplementation();

        // Initial upgrade and setup call
        __setImplementation(newImplementation);
        if (data.length > 0 || forceCall) {
            Address._functionDelegateCall(newImplementation, data);
        }

        // Perform rollback test if not already in progress
        StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot._getBooleanSlot(__ROLLBACK_SLOT);
        if (!rollbackTesting.value) {
            // Trigger rollback using upgradeTo from the new implementation
            rollbackTesting.value = true;
            Address._functionDelegateCall(
                newImplementation, abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
            );
            rollbackTesting.value = false;
            // Check rollback was effective
            require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
            // Finally reset to the new implementation and log the upgrade
            _upgradeTo(newImplementation);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlot._getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function __setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlot._getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        __setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlot._getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function __setBeacon(address newBeacon) private {
        require(Address._isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            Address._isContract(IBeacon(newBeacon).implementation()), "ERC1967: beacon implementation is not a contract"
        );
        StorageSlot._getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-__setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        __setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            Address._functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        }
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage slots in the inheritance chain.
     * Storage slot management is necessary, as we're using an upgradable proxy contract.
     * For details, see: https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

import "./ERC1967Upgrade.sol";
import "./interfaces/IERC1822.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is IERC1822Proxiable, ERC1967Upgrade {
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallSecure(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage slots in the inheritance chain.
     * Storage slot management is necessary, as we're using an upgradable proxy contract.
     * For details, see: https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

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

interface IBaseRewardPool {
    /**
     * @dev withdrawAndUnwrap() only works for a BaseRewardPool address where stakingToken
     * corresponds to a Curve pool (i.e., cvx3CRV can unrwap to 3CRV). This function
     * will not work for the BaseRewardPool address that corresponds to cvxCRV, because
     * it cannot be unwrapped to CRV.
     */
    function withdrawAndUnwrap(uint256 _amount, bool _claim) external returns (bool);

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

    function stake(uint256 _amount) external returns (bool);

    function getReward() external returns (bool);

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

    function earned(address _account) external returns (uint256);
}

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

interface IBooster {
    function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns (bool);
}

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

interface ICrvDepositor {
    function deposit(uint256 _amount, bool _lock, address _stakeAddress) external;
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.8.0;

interface ICurve3Pool {
    function calc_token_amount(uint256[3] calldata _amounts, bool _is_deposit) external returns (uint256);

    function add_liquidity(uint256[3] calldata _amounts, uint256 _min_mint_amount) external;

    function calc_withdraw_one_coin(uint256 _token_amount, int128 i) external returns (uint256);

    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 _min_amount) external;

    function remove_liquidity(uint256 _amount, uint256[3] calldata _min_amounts) external;

    function get_virtual_price() external returns (uint256);

    function coins(uint256 i) external returns (address);
}

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

interface ICvxRewardPool {
    function stake(uint256 _amount) external;

    function getReward(bool _stake) external;

    function withdraw(uint256 _amount, bool claim) external;

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

    function earned(address _account) external returns (uint256);
}

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

interface ITreasury {
    function mint(address _stable, uint256 _amount) external;

    function redeem(address _stable, uint256 _amount) external;
}

{
  "remappings": [
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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