/**
 *Submitted for verification at Etherscan.io on 2022-03-23
*/

// Sources flattened with hardhat v2.6.7 https://hardhat.org

// File @openzeppelin/contracts/token/ERC20/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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


// File @openzeppelin/contracts/math/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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


// File @openzeppelin/contracts/token/ERC20/[email protected]



pragma solidity >=0.6.0 <0.8.0;



/**
 * @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 SafeMath for uint256;
    using Address for address;

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

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

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

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// File contracts/convex/IConvexBooster.sol


/* 

  _                          _   _____   _                       
 | |       ___   _ __     __| | |  ___| | |   __ _   _ __    ___ 
 | |      / _ \ | '_ \   / _` | | |_    | |  / _` | | '__|  / _ \
 | |___  |  __/ | | | | | (_| | |  _|   | | | (_| | | |    |  __/
 |_____|  \___| |_| |_|  \__,_| |_|     |_|  \__,_| |_|     \___|
                                                                 
LendFlare.finance
*/

pragma solidity =0.6.12;

interface IConvexBooster {
    function liquidate(
        uint256 _convexPid,
        int128 _curveCoinId,
        address _user,
        uint256 _amount
    ) external returns (address, uint256);

    function depositFor(
        uint256 _convexPid,
        uint256 _amount,
        address _user
    ) external returns (bool);

    function withdrawFor(
        uint256 _convexPid,
        uint256 _amount,
        address _user,
        bool _freezeTokens
    ) external returns (bool);

    function poolInfo(uint256 _convexPid)
        external
        view
        returns (
            uint256 originConvexPid,
            address curveSwapAddress,
            address lpToken,
            address originCrvRewards,
            address originStash,
            address virtualBalance,
            address rewardCrvPool,
            address rewardCvxPool,
            bool shutdown
        );

    function addConvexPool(uint256 _originConvexPid) external;
}


// File contracts/convex/ConvexInterfaces.sol


/* 

  _                          _   _____   _                       
 | |       ___   _ __     __| | |  ___| | |   __ _   _ __    ___ 
 | |      / _ \ | '_ \   / _` | | |_    | |  / _` | | '__|  / _ \
 | |___  |  __/ | | | | | (_| | |  _|   | | | (_| | | |    |  __/
 |_____|  \___| |_| |_|  \__,_| |_|     |_|  \__,_| |_|     \___|
                                                                 
LendFlare.finance
*/

pragma solidity =0.6.12;

interface IOriginConvexBooster {
    function deposit( uint256 _pid, uint256 _amount, bool _stake ) external returns (bool);
    function withdraw(uint256 _pid, uint256 _amount) external returns(bool);
    function claimStashToken(address _token, address _rewardAddress, address _lfRewardAddress, uint256 _rewards) external;
    function poolInfo(uint256) external view returns(address,address,address,address,address, bool);
    function isShutdown() external view returns(bool);
    function minter() external view returns(address);
    function earmarkRewards(uint256) external returns(bool);
}

interface IOriginConvexRewardPool {
    function getReward() external returns(bool);
    function getReward(address _account, bool _claimExtras) external returns(bool);
    function withdrawAllAndUnwrap(bool claim) external;
    function withdrawAndUnwrap(uint256 amount, bool claim) external returns(bool);
    function withdrawAll(bool claim) external;
    function withdraw(uint256 amount, bool claim) external returns(bool);
    function stakeFor(address _for, uint256 _amount) external returns(bool);
    function stakeAll() external returns(bool);
    function stake(uint256 _amount) external returns(bool);
    function earned(address account) external view returns (uint256);
    function rewardPerToken() external view returns (uint256);
    function rewardToken() external returns(address);
    function extraRewards(uint256 _idx) external view returns (address);
    function extraRewardsLength() external view returns (uint256);
}

interface IOriginConvexVirtualBalanceRewardPool {
    function getReward(address _account) external;
    function getReward() external;
    function rewardToken() external returns(address);
}

interface IConvexRewardPool {
    function earned(address account) external view returns (uint256);
    function stake(address _for) external;
    function withdraw(address _for) external;
    function getReward(address _for) external;
    function notifyRewardAmount(uint256 reward) external;

    function extraRewards(uint256 _idx) external view returns (address);
    function extraRewardsLength() external view returns (uint256);
    function addExtraReward(address _reward) external returns(bool);
}

interface IConvexRewardFactory {
    function createReward(address _reward, address _virtualBalance, address _operator) external returns (address);
}

interface ICurveSwap {
    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_amount) external;
    /* function remove_liquidity(uint256 _token_amount, uint256[] memory min_amounts) external; */
    function coins(uint256 _coinId) external view returns(address);
    function balances(uint256 _coinId) external view returns(uint256);
}

interface ICurveAddressProvider{
    function get_registry() external view returns(address);
    function get_address(uint256 _id) external view returns(address);
}

interface ICurveRegistry{
    function gauge_controller() external view returns(address);
    function get_lp_token(address) external view returns(address);
    function get_pool_from_lp_token(address) external view returns(address);
    function get_gauges(address) external view returns(address[10] memory,uint128[10] memory);
}


pragma solidity =0.6.12;

interface IConvexBoosterV2 is IConvexBooster {
    function liquidate(
        uint256 _convexPid,
        int128 _curveCoinId,
        address _user,
        uint256 _amount
    ) external override returns (address, uint256);

    function depositFor(
        uint256 _convexPid,
        uint256 _amount,
        address _user
    ) external override returns (bool);

    function withdrawFor(
        uint256 _convexPid,
        uint256 _amount,
        address _user,
        bool _freezeTokens
    ) external override returns (bool);

    function poolInfo(uint256 _convexPid)
        external
        view
        override
        returns (
            uint256 originConvexPid,
            address curveSwapAddress,
            address lpToken,
            address originCrvRewards,
            address originStash,
            address virtualBalance,
            address rewardCrvPool,
            address rewardCvxPool,
            bool shutdown
        );

    function addConvexPool(uint256 _originConvexPid) external override;

    function addConvexPool(uint256 _originConvexPid, address _curveSwapAddress, address _curveZapAddress, address _basePoolAddress, bool _isMeta, bool _isMetaFactory)
        external;

    function getPoolZapAddress(address _lpToken)
        external
        view
        returns (address);

    function getPoolToken(uint256 _pid) external view returns (address);

    function calculateTokenAmount(
        uint256 _pid,
        uint256 _tokens,
        int128 _curveCoinId
    ) external view returns (uint256);
}

pragma solidity =0.6.12;


interface ICurveSwapV2 is ICurveSwap {
    // function remove_liquidity_one_coin(
    //     uint256 _token_amount,
    //     int128 _i,
    //     uint256 _min_amount
    // ) external override;

    function remove_liquidity_one_coin(
        address _pool,
        uint256 _burn_amount,
        int128 _i,
        uint256 _min_amount
    ) external;

    function coins(uint256 _coinId) external view override returns (address);

    function balances(uint256 _coinId) external view override returns (uint256);

    function get_virtual_price() external view returns (uint256);

    function calc_withdraw_one_coin(uint256 _tokenAmount, int128 _tokenId)
        external
        view
        returns (uint256);

    /* factory */
    function calc_withdraw_one_coin(
        address _pool,
        uint256 _tokenAmount,
        int128 _tokenId
    ) external view returns (uint256);
}

pragma solidity 0.6.12;


contract ConvexBoosterV2Test {
    using Address for address payable;
    using SafeERC20 for IERC20;
    using Address for address;

    address public constant ZERO_ADDRESS =
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    address public originConvexBooster;

    struct PoolInfo {
        uint256 originConvexPid;
        address curveSwapAddress; /* like 3pool https://github.com/curvefi/curve-js/blob/master/src/constants/abis/abis-ethereum.ts */
        address lpToken;
        address originCrvRewards;
        address originStash;
        address virtualBalance;
        address rewardCrvPool;
        address rewardCvxPool;
        bool shutdown;
    }

    struct MetaPoolInfo {
        address swapAddress;
        address zapAddress;
        address basePoolAddress;
        bool isMeta;
        bool isMetaFactory;
    }

    PoolInfo[] public poolInfo;

    mapping(address => MetaPoolInfo) public metaPoolInfo;

    event CurveZap(address lpToken, address curveZapAddress);

    // @custom:oz-upgrades-unsafe-allow constructor
    constructor(address _originConvexBooster) public {
        originConvexBooster = _originConvexBooster;

        // sUSD
        addConvexPool(
            4,
            0xA5407eAE9Ba41422680e2e00537571bcC53efBfD,
            0xFCBa3E75865d2d561BE8D220616520c171F12851,
            0xA5407eAE9Ba41422680e2e00537571bcC53efBfD,
            false,
            false
        );

        // mim , busdv2 factory pool
        addConvexPool(
            40,
            0x5a6A4D54456819380173272A5E8E9B9904BdF41B,
            0xA79828DF1850E8a3A3064576f380D90aECDD3359,
            0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7,
            true,
            true
        );

        // musd , ust, gusd , usdn , usdk , husd , rsv , dusd , obtc , bbtc , tbtc , pbtc export function public(base_pool) in code
        addConvexPool(
            14,
            0x8474DdbE98F5aA3179B3B3F5942D724aFcdec9f6,
            0x803A2B40c5a9BB2B86DD630B274Fa2A9202874C2,
            0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7,
            true,
            false
        );

        // lusd alusd has base_pool in code
        addConvexPool(
            33,
            0xEd279fDD11cA84bEef15AF5D39BB4d4bEE23F0cA,
            0xA79828DF1850E8a3A3064576f380D90aECDD3359,
            0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7,
            true,
            false
        );

        // factory mim-ust
        addConvexPool(
            52,
            0x55A8a39bc9694714E2874c1ce77aa1E599461E18,
            0x55A8a39bc9694714E2874c1ce77aa1E599461E18,
            0x55A8a39bc9694714E2874c1ce77aa1E599461E18,
            true,
            false
        );
        
        // factory dola-3pool
        addConvexPool(
            62,
            0xd632f22692FaC7611d2AA1C0D552930D43CAEd3B,
            0xA79828DF1850E8a3A3064576f380D90aECDD3359,
            0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7,
            true,
            true
        );

        // addConvexPool(_originConvexPid, _curveSwapAddress, _curveZapAddress, _basePoolAddress, _isMeta, _isMetaFactory);
    }

    function _addConvexPool(
        uint256 _originConvexPid,
        address _lpToken,
        address _originCrvRewards,
        address _originStash,
        address _curveSwapAddress
    ) internal {
        poolInfo.push(
            PoolInfo({
                originConvexPid: _originConvexPid,
                curveSwapAddress: _curveSwapAddress,
                lpToken: _lpToken,
                originCrvRewards: address(0),
                originStash: address(0),
                virtualBalance: address(0),
                rewardCrvPool: address(0),
                rewardCvxPool: address(0),
                shutdown: false
            })
        );
    }

    // Reference https://curve.readthedocs.io/ref-addresses.html?highlight=zap#deposit-zaps
    function addConvexPool(
        uint256 _originConvexPid,
        address _curveSwapAddress,
        address _curveZapAddress,
        address _basePoolAddress,
        bool _isMeta,
        bool _isMetaFactory
    ) public {
        require(_curveSwapAddress != address(0), "!_curveSwapAddress");
        require(_curveZapAddress != address(0), "!_curveZapAddress");
        require(_basePoolAddress != address(0), "!_basePoolAddress");

        (
            address lpToken,
            ,
            ,
            address originCrvRewards,
            address originStash,
            bool shutdown
        ) = IOriginConvexBooster(originConvexBooster).poolInfo(
                _originConvexPid
            );

        require(!shutdown, "!shutdown");
        require(lpToken != address(0), "!lpToken");

        metaPoolInfo[lpToken] = MetaPoolInfo(
            _curveSwapAddress,
            _curveZapAddress,
            _basePoolAddress,
            _isMeta,
            _isMetaFactory
        );

        _addConvexPool(
            _originConvexPid,
            lpToken,
            originCrvRewards,
            originStash,
            _curveZapAddress
        );

        emit CurveZap(lpToken, _curveZapAddress);
    }

    function _removeLiquidity(
        address _lpToken,
        address _curveSwapAddress,
        uint256 _amount,
        int128 _coinId
    ) internal {
        if (metaPoolInfo[_lpToken].zapAddress != address(0)) {
            _curveSwapAddress = metaPoolInfo[_lpToken].zapAddress;

            if (metaPoolInfo[_lpToken].isMetaFactory) {
                ICurveSwapV2(_curveSwapAddress).remove_liquidity_one_coin(
                    _lpToken,
                    _amount,
                    _coinId,
                    0
                );

                return;
            }
        }

        ICurveSwapV2(_curveSwapAddress).remove_liquidity_one_coin(
            _amount,
            _coinId,
            0
        );
    }

    function liquidate(
        uint256 _pid,
        int128 _coinId,
        uint256 _amount
    ) external returns (address, uint256) {
        PoolInfo storage pool = poolInfo[_pid];

        IERC20(pool.lpToken).safeApprove(pool.curveSwapAddress, 0);
        IERC20(pool.lpToken).safeApprove(pool.curveSwapAddress, _amount);

        address curveSwapAddress = pool.curveSwapAddress;
        address underlyToken;

        if (metaPoolInfo[pool.lpToken].zapAddress != address(0)) {
            if (_coinId == 0) {
                underlyToken = ICurveSwap(
                    metaPoolInfo[pool.lpToken].swapAddress
                ).coins(uint256(_coinId));
            } else {
                underlyToken = ICurveSwap(
                    metaPoolInfo[pool.lpToken].basePoolAddress
                ).coins(uint256(_coinId) - 1);
            }
        } else {
            underlyToken = ICurveSwap(pool.curveSwapAddress).coins(
                uint256(_coinId)
            );
        }

        _removeLiquidity(pool.lpToken, curveSwapAddress, _amount, _coinId);

        if (underlyToken == ZERO_ADDRESS) {
            uint256 totalAmount = address(this).balance;

            msg.sender.sendValue(totalAmount);

            return (ZERO_ADDRESS, totalAmount);
        } else {
            uint256 totalAmount = IERC20(underlyToken).balanceOf(address(this));

            IERC20(underlyToken).safeTransfer(msg.sender, totalAmount);

            return (underlyToken, totalAmount);
        }
    }

    receive() external payable {}

    /* view functions */
    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    function getPoolToken(uint256 _pid) external view returns (address) {
        PoolInfo storage pool = poolInfo[_pid];

        return pool.lpToken;
    }

    function getPoolZapAddress(address _lpToken)
        external
        view
        returns (address)
    {
        return metaPoolInfo[_lpToken].zapAddress;
    }

    function calculateTokenAmount(
        uint256 _pid,
        uint256 _tokens,
        int128 _curveCoinId
    ) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];

        address curveSwapAddress = pool.curveSwapAddress;

        if (metaPoolInfo[pool.lpToken].zapAddress != address(0)) {
            curveSwapAddress = metaPoolInfo[pool.lpToken].zapAddress;

            if (metaPoolInfo[pool.lpToken].isMetaFactory) {
                return
                    ICurveSwapV2(curveSwapAddress).calc_withdraw_one_coin(
                        pool.lpToken,
                        _tokens,
                        _curveCoinId
                    );
            }
        }

        return
            ICurveSwapV2(curveSwapAddress).calc_withdraw_one_coin(
                _tokens,
                _curveCoinId
            );
    }
}