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// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.13;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { ICurveMetaPool, ICurvePool } from "../external/CurveInterfaces.sol";
import { IVotiumMerkleStash } from "../external/VotiumInterfaces.sol";
import { RewardPool } from "./RewardPool.sol";

// usdm3crv 0x5B3b5DF2BF2B6543f78e053bD91C4Bdd820929f1
// 3crv 0xbebc44782c7db0a1a60cb6fe97d0b483032ff1c7
// zap tx https://etherscan.io/tx/0x4a1c6582675b2582849b3947c63f53e209f320225aa501d0347bb8bae278d365
//BASE_COINS: constant(address[3]) = [
//    0x6B175474E89094C44Da98b954EedeAC495271d0F,  # DAI
//    0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48,  # USDC
//    0xdAC17F958D2ee523a2206206994597C13D831ec7,  # USDT
//]

contract PegRecoveryModule is RewardPool{
    using SafeERC20 for IERC20;

    struct BaseCoins {
        uint256 dai;
        uint256 usdc;
        uint256 usdt;
    }

    // token addresses
    IERC20 public immutable usdm; // 0x31d4Eb09a216e181eC8a43ce79226A487D6F0BA9

    IERC20 public immutable crv3; // 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490

    IERC20 public immutable dai; // 0x6B175474E89094C44Da98b954EedeAC495271d0F

    IERC20 public immutable usdc; // 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48

    IERC20 public immutable usdt; // 0xdAC17F958D2ee523a2206206994597C13D831ec7

    // curve addresses
    ICurveMetaPool public immutable usdm3crv; // 0x5B3b5DF2BF2B6543f78e053bD91C4Bdd820929f1

    ICurvePool public immutable crv3pool; // 0xbebc44782c7db0a1a60cb6fe97d0b483032ff1c7

    // usdm deposit info

    uint256 public totalUsdm;

    uint256 public usdmProvided;

    mapping(address => uint256) public usdmShare;

    // 3crv deposit info
    uint256 public totalCrv3;

    uint256 public crv3Provided;

    mapping(address => uint256) public crv3Share;

    // reward info

    constructor(
        IERC20 _usdm,
        IERC20 _crv3,
        IERC20 _dai,
        IERC20 _usdc, 
        IERC20 _usdt,
        ICurveMetaPool _usdm3crv,
        ICurvePool _crv3pool,
        IERC20 _gcrv,
        address _operator
    ) RewardPool(_operator, _gcrv){
        usdm = _usdm;
        crv3 = _crv3;
        dai = _dai;
        usdc = _usdc;
        usdt = _usdt;
        usdm3crv = _usdm3crv;
        crv3pool = _crv3pool;
    }

    // 3crv section

    function deposit3Crv(
        uint256 _deposit
    ) external updateReward(msg.sender) {
        totalCrv3 += _deposit;
        crv3Share[msg.sender] += _deposit;
        crv3.transferFrom(msg.sender, address(this), _deposit);
    }

    function withdraw3Crv(
        uint256 _withdraw
    ) external updateReward(msg.sender) {
        totalCrv3 -= _withdraw;
        crv3Share[msg.sender] -= _withdraw;
        crv3.transfer(msg.sender, _withdraw);
    }

    function depositStable(
        uint256[3] calldata _deposit,
        uint256 _min3crv
    ) external updateReward(msg.sender){
        // convert deposit to 3crv
        if(_deposit[0] > 0) {
            dai.safeTransferFrom(msg.sender, address(this), _deposit[0]);
            dai.safeApprove(address(crv3pool), _deposit[0]);
        }
        if(_deposit[1] > 0) {
            usdc.safeTransferFrom(msg.sender, address(this), _deposit[1]);
            usdc.safeApprove(address(crv3pool), _deposit[1]);
        }
        if(_deposit[2] > 0) {
            usdt.safeTransferFrom(msg.sender, address(this), _deposit[2]);
            usdt.safeApprove(address(crv3pool), _deposit[2]);
        }

        // add liquidity to 3pool right away and hold as 3crv
        uint256 balance = crv3.balanceOf(address(this));
        crv3pool.add_liquidity(
            _deposit,
            _min3crv
        );
        // **vague name to use only 1 variable
        balance = crv3.balanceOf(address(this)) - balance;

        // update storage variables
        totalCrv3 += balance;
        crv3Share[msg.sender] += balance;
    }

    function withdrawStable(
        uint256[3] calldata _withdraw,
        uint256 _3crv_max
    ) external updateReward(msg.sender) {
        // update storage variables
        uint256 balance = crv3.balanceOf(address(this));
        crv3pool.remove_liquidity_imbalance(
            _withdraw,
            _3crv_max
        );
        balance = balance - crv3.balanceOf(address(this));
        totalCrv3 -= balance;
        crv3Share[msg.sender] -= balance;
        if(_withdraw[0] > 0){
            dai.safeTransfer(msg.sender, _withdraw[0]);
        }
        if(_withdraw[1] > 0){
            usdc.safeTransfer(msg.sender, _withdraw[1]);
        }
        if(_withdraw[2] > 0){
            usdt.safeTransfer(msg.sender, _withdraw[2]);
        }
    }

    // usdm section
    function depositUsdm(
        uint256 _usdm
    ) external updateReward(msg.sender) {
        usdmShare[msg.sender] += _usdm;
        totalUsdm += _usdm;
        usdm.transferFrom(msg.sender, address(this), _usdm);
    }

    function withdrawUsdm(
        uint256 _usdm
    ) external updateReward(msg.sender){
        usdmShare[msg.sender] -= _usdm;
        totalUsdm -= _usdm;
        usdm.transfer(msg.sender, _usdm);
    }

    // peg recovery section
    function pairLiquidity(uint256 _amount, uint256 _min_liquidity) external onlyOwner {
        uint256[2] memory amounts = [_amount, _amount];
        usdm.safeApprove(address(usdm3crv), _amount);
        crv3.safeApprove(address(usdm3crv), _amount);
        usdmProvided += _amount;
        crv3Provided += _amount;
        usdm3crv.add_liquidity(amounts, _min_liquidity);
    }

    function removeLiquidity(uint256 _amount, uint256 _max_burn) external onlyOwner {
        uint256[2] memory amounts = [_amount, _amount];
        usdmProvided -= _amount;
        crv3Provided -= _amount;
        usdm3crv.remove_liquidity_imbalance(amounts, _max_burn);
    }

    function sweepTokens() external onlyOwner {
        uint256 usdmLeftover = usdm.balanceOf(address(this)) - (totalUsdm - usdmProvided);
        usdm.transfer(msg.sender, usdmLeftover);
        uint256 crv3Leftover = crv3.balanceOf(address(this)) - (totalCrv3 - crv3Provided);
        crv3.transfer(msg.sender, crv3Leftover);
    }

    // --- votium virtual functions ---
    function balanceOf(address _user) public view override returns(uint256) {
        return usdmShare[_user] + crv3Share[_user];
    }

    function totalSupply() public view override returns(uint256) {
        return totalUsdm + totalCrv3;
    }

    function notRecoverableToken(address _token) public view override returns(bool) {
        return address(crv3) == _token || address(usdm) == _token || address(rewardsToken) == _token || address(usdm3crv) == _token;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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() {
        _transferOwnership(_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 {
        _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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

    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'
        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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [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 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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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) {
        return msg.data;
    }
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.11;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface ICurveMetaPool is IERC20{
    function coins(uint256 index) external view returns(address);

    function add_liquidity(uint256[2] calldata _amounts, uint256 _min_mint_amount) external;
    function remove_liquidity(uint256 _burning_amount, uint256[2] calldata _min_amounts) external;
    function remove_liquidity_imbalance(uint256[2] calldata _amounts, uint256 _maxBurningAmount) external;
}

interface ICurvePool {
    function add_liquidity(uint256[3] calldata _amounts, uint256 _min_mint_amount) external;
    function remove_liquidity(uint256 _burning_amount, uint256[3] calldata _min_amounts) external;
    function remove_liquidity_imbalance(uint256[3] calldata _amounts, uint256 _maxBurningAmount) external;
    function remove_liquidity_one_coin(uint256 _3crv_token_amount, int128 i, uint256 _min_amount) external;
    function calc_token_amount(uint256[3] calldata _amounts, bool _deposit) external view returns(uint256);
    function calc_withdraw_one_coin(uint256 _token_amount, int128 _i) external view returns(uint256);
}

interface ICurveZap {
    function remove_liquidity(
        address _pool,
        uint256 _burn_amount,
        uint256[4] calldata _min_amounts,
        address _receiver
    ) external returns(uint256[4] memory);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.13;

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

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.15;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

abstract contract RewardPool is Ownable, ReentrancyGuard, Pausable {
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    IERC20 public immutable rewardsToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 14 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;
    address public rewardsDistribution;

    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _operator,
        IERC20 _rewardsToken
    ) {
        require(
            _operator != address(0),
            "invalid reward distribution"
        );
        require(address(_rewardsToken) != address(0), "invalid reward token");
        transferOwnership(_operator);
        rewardsToken = _rewardsToken;
        rewardsDistribution = _operator;
    }

    /* ========== VIEWS ========== */

    function totalSupply() public view virtual returns (uint256);

    function balanceOf(address account) public view virtual returns(uint256);

    function notRecoverableToken(address token) public view virtual returns(bool);

    function lastTimeRewardApplicable() public view returns (uint256) {
        return block.timestamp < periodFinish ? block.timestamp : periodFinish;
    }

    function rewardPerToken() public view returns (uint256) {
        if (totalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored +
            (((lastTimeRewardApplicable() - lastUpdateTime) *
                rewardRate *
                1e18) / totalSupply());
    }

    function earned(address account) public view returns (uint256) {
        return
            (balanceOf(account) *
                (rewardPerToken() - userRewardPerTokenPaid[account])) /
            1e18 +
            rewards[account];
    }

    function getRewardForDuration() external view returns (uint256) {
        return rewardRate * rewardsDuration;
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function notifyRewardAmount(uint256 reward)
        external
        updateReward(address(0))
    {
        require(msg.sender == rewardsDistribution, "Not rewardsDistribution");

        rewardsToken.safeTransferFrom(msg.sender, address(this), reward);

        if (block.timestamp >= periodFinish) {
            rewardRate = reward / rewardsDuration;
        } else {
            uint256 remaining = periodFinish - block.timestamp;
            uint256 leftover = remaining * rewardRate;
            rewardRate = (reward + leftover) / rewardsDuration;
        }

        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp + rewardsDuration;
        emit RewardAdded(reward);
    }

    // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount)
        external
        onlyOwner
    {
        require(!notRecoverableToken(tokenAddress), "cannot withdraw staking token");
        IERC20(tokenAddress).safeTransfer(msg.sender, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(
            block.timestamp > periodFinish,
            "Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

    function setRewardsDistribution(address _rewardsDistribution)
        external
        onlyOwner
    {
        require(
            _rewardsDistribution != address(0),
            "invalid reward distribution"
        );
        rewardsDistribution = _rewardsDistribution;
        emit RewardsDistributionUpdated(_rewardsDistribution);
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event RewardsDistributionUpdated(address indexed rewardsDistribution);
    event Recovered(address token, uint256 amount);
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _usdm (address): 0x31d4Eb09a216e181eC8a43ce79226A487D6F0BA9
Arg [1] : _crv3 (address): 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490
Arg [2] : _dai (address): 0x6B175474E89094C44Da98b954EedeAC495271d0F
Arg [3] : _usdc (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Arg [4] : _usdt (address): 0xdAC17F958D2ee523a2206206994597C13D831ec7
Arg [5] : _usdm3crv (address): 0x5B3b5DF2BF2B6543f78e053bD91C4Bdd820929f1
Arg [6] : _crv3pool (address): 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
Arg [7] : _gcrv (address): 0x06f05a658b88D6d324d84A5DA13D549eA06c9Ad6
Arg [8] : _operator (address): 0x597F540bB63381FfA267027D2D479984825057A8

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 00000000000000000000000031d4eb09a216e181ec8a43ce79226a487d6f0ba9
Arg [1] : 0000000000000000000000006c3f90f043a72fa612cbac8115ee7e52bde6e490
Arg [2] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [3] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [4] : 000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7
Arg [5] : 0000000000000000000000005b3b5df2bf2b6543f78e053bd91c4bdd820929f1
Arg [6] : 000000000000000000000000bebc44782c7db0a1a60cb6fe97d0b483032ff1c7
Arg [7] : 00000000000000000000000006f05a658b88d6d324d84a5da13d549ea06c9ad6
Arg [8] : 000000000000000000000000597f540bb63381ffa267027d2d479984825057a8