// File: contracts\interfaces\ICurveConvex.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

interface ICurveConvex {
   function earmarkRewards(uint256 _pid) external returns(bool);
   function earmarkFees() external returns(bool);
   function poolInfo(uint256 _pid) external returns(address _lptoken, address _token, address _gauge, address _crvRewards, address _stash, bool _shutdown);
}

// File: contracts\interfaces\IConvexWrapper.sol


pragma solidity 0.8.10;

interface IConvexWrapper{

   struct EarnedData {
        address token;
        uint256 amount;
    }

  function convexPoolId() external returns(uint256 _poolId);
  function deposit(uint256 _amount, address _to) external;
  function stake(uint256 _amount, address _to) external;
  function withdraw(uint256 _amount) external;
  function withdrawAndUnwrap(uint256 _amount) external;
  function getReward(address _account) external;
  function getReward(address _account, address _forwardTo) external;
  function rewardLength() external view returns(uint256);
  function earned(address _account) external view returns(EarnedData[] memory claimable);
  function setVault(address _vault) external;
}

// File: contracts\interfaces\IProxyVault.sol


pragma solidity 0.8.10;

interface IProxyVault {

    enum VaultType{
        Erc20Baic,
        UniV3,
        Convex
    }

    function initialize(address _owner, address _stakingAddress, address _stakingToken, address _rewardsAddress) external;
    function usingProxy() external returns(address);
    function rewards() external returns(address);
    function getReward() external;
    function getReward(bool _claim) external;
    function getReward(bool _claim, address[] calldata _rewardTokenList) external;
    function earned() external view returns (address[] memory token_addresses, uint256[] memory total_earned);
}

// File: contracts\interfaces\IFeeRegistry.sol


pragma solidity 0.8.10;

interface IFeeRegistry{
    function cvxfxsIncentive() external view returns(uint256);
    function cvxIncentive() external view returns(uint256);
    function platformIncentive() external view returns(uint256);
    function totalFees() external view returns(uint256);
    function maxFees() external view returns(uint256);
    function feeDeposit() external view returns(address);
    function getFeeDepositor(address _from) external view returns(address);
}

// File: contracts\interfaces\IFraxFarmBase.sol


pragma solidity >=0.8.0;

interface IFraxFarmBase{

    function totalLiquidityLocked() external view returns (uint256);
    function lockedLiquidityOf(address account) external view returns (uint256);

    function toggleValidVeFXSProxy(address proxy_address) external;
    function proxyToggleStaker(address staker_address) external;
    function stakerSetVeFXSProxy(address proxy_address) external;
    function getReward(address destination_address) external returns (uint256[] memory);

}

// File: contracts\interfaces\IRewards.sol


pragma solidity 0.8.10;

interface IRewards{
    struct EarnedData {
        address token;
        uint256 amount;
    }
    
    function initialize(uint256 _pid, bool _startActive) external;
    function addReward(address _rewardsToken, address _distributor) external;
    function approveRewardDistributor(
        address _rewardsToken,
        address _distributor,
        bool _approved
    ) external;
    function deposit(address _owner, uint256 _amount) external;
    function withdraw(address _owner, uint256 _amount) external;
    function getReward(address _forward) external;
    function notifyRewardAmount(address _rewardsToken, uint256 _reward) external;
    function balanceOf(address account) external view returns (uint256);
    function claimableRewards(address _account) external view returns(EarnedData[] memory userRewards);
    function rewardTokens(uint256 _rid) external view returns (address);
    function rewardTokenLength() external view returns(uint256);
    function active() external view returns(bool);
}

// File: @openzeppelin\contracts\token\ERC20\IERC20.sol



pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin\contracts\utils\Address.sol



pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        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");

        (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);
            }
        }
    }
}

// File: @openzeppelin\contracts\token\ERC20\utils\SafeERC20.sol



pragma solidity ^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 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");
        }
    }
}

// File: contracts\StakingProxyBase.sol


pragma solidity 0.8.10;
contract StakingProxyBase is IProxyVault{
    using SafeERC20 for IERC20;

    address public constant fxs = address(0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0);
    address public constant vefxsProxy = address(0x59CFCD384746ec3035299D90782Be065e466800B);
    address public constant feeRegistry = address(0xC9aCB83ADa68413a6Aa57007BC720EE2E2b3C46D); //fee registry

    address public owner; //owner of the vault
    address public stakingAddress; //farming contract
    address public stakingToken; //farming token
    address public rewards; //extra rewards on convex
    address public usingProxy; //address of proxy being used

    uint256 public constant FEE_DENOMINATOR = 10000;

    constructor() {
    }

    function vaultType() external virtual pure returns(VaultType){
        return VaultType.Erc20Baic;
    }

    function vaultVersion() external virtual pure returns(uint256){
        return 1;
    }

    modifier onlyOwner() {
        require(owner == msg.sender, "!auth");
        _;
    }

    modifier onlyAdmin() {
        require(vefxsProxy == msg.sender, "!auth_admin");
        _;
    }

    //initialize vault
    function initialize(address _owner, address _stakingAddress, address _stakingToken, address _rewardsAddress) external virtual{

    }

    function changeRewards(address _rewardsAddress) external onlyAdmin{
        
        //remove from old rewards and claim
        if(IRewards(rewards).active()){
            uint256 bal = IRewards(rewards).balanceOf(address(this));
            if(bal > 0){
                IRewards(rewards).withdraw(owner, bal);
            }
            IRewards(rewards).getReward(owner);
        }

        //set to new rewards
        rewards = _rewardsAddress;

        //update balance
        _checkpointRewards();
    }

    //checkpoint weight on farm by calling getReward as its the lowest cost thing to do.
    function checkpointRewards() external onlyAdmin{
        //claim rewards to local vault
        IFraxFarmBase(stakingAddress).getReward(address(this));
    }

    function setVeFXSProxy(address _proxy) external onlyAdmin{
        //set the vefxs proxy
        _setVeFXSProxy(_proxy);
    }

    function _setVeFXSProxy(address _proxyAddress) internal{
        //set proxy address on staking contract
        IFraxFarmBase(stakingAddress).stakerSetVeFXSProxy(_proxyAddress);
        usingProxy = _proxyAddress;
    }


    function getReward() external virtual{}
    function getReward(bool _claim) external virtual{}
    function getReward(bool _claim, address[] calldata _rewardTokenList) external virtual{}
    function earned() external view virtual returns (address[] memory token_addresses, uint256[] memory total_earned){}


    //checkpoint and add/remove weight to convex rewards contract
    function _checkpointRewards() internal{
        //if rewards are active, checkpoint
        if(IRewards(rewards).active()){
            //using liquidity shares from staking contract will handle rebasing tokens correctly
            uint256 userLiq = IFraxFarmBase(stakingAddress).lockedLiquidityOf(address(this));
            //get current balance of reward contract
            uint256 bal = IRewards(rewards).balanceOf(address(this));
            if(userLiq >= bal){
                //add the difference to reward contract
                IRewards(rewards).deposit(owner, userLiq - bal);
            }else{
                //remove the difference from the reward contract
                IRewards(rewards).withdraw(owner, bal - userLiq);
            }
        }
    }

    //apply fees to fxs and send remaining to owner
    function _processFxs() internal{

        //get fee rate from booster
        uint256 totalFees = IFeeRegistry(feeRegistry).totalFees();

        //send fxs fees to fee deposit
        uint256 fxsBalance = IERC20(fxs).balanceOf(address(this));
        uint256 sendAmount = fxsBalance * totalFees / FEE_DENOMINATOR;
        if(sendAmount > 0){
            IERC20(fxs).transfer(IFeeRegistry(feeRegistry).getFeeDepositor(usingProxy), sendAmount);
        }

        //transfer remaining fxs to owner
        sendAmount = IERC20(fxs).balanceOf(address(this));
        if(sendAmount > 0){
            IERC20(fxs).transfer(owner, sendAmount);
        }
    }

    //get extra rewards
    function _processExtraRewards() internal{
        if(IRewards(rewards).active()){
            //check if there is a balance because the reward contract could have be activated later
            //dont use _checkpointRewards since difference of 0 will still call deposit() and cost gas
            uint256 bal = IRewards(rewards).balanceOf(address(this));
            uint256 userLiq = IFraxFarmBase(stakingAddress).lockedLiquidityOf(address(this));
            if(bal == 0 && userLiq > 0){
                //bal == 0 and liq > 0 can only happen if rewards were turned on after staking
                IRewards(rewards).deposit(owner,userLiq);
            }
            IRewards(rewards).getReward(owner);
        }
    }

    //transfer other reward tokens besides fxs(which needs to have fees applied)
    function _transferTokens(address[] memory _tokens) internal{
        //transfer all tokens
        for(uint256 i = 0; i < _tokens.length; i++){
            if(_tokens[i] != fxs){
                uint256 bal = IERC20(_tokens[i]).balanceOf(address(this));
                if(bal > 0){
                    IERC20(_tokens[i]).safeTransfer(owner, bal);
                }
            }
        }
    }
}

// File: contracts\interfaces\IFraxFarmERC20.sol


pragma solidity >=0.8.0;

interface IFraxFarmERC20 {
    
    struct LockedStake {
        bytes32 kek_id;
        uint256 start_timestamp;
        uint256 liquidity;
        uint256 ending_timestamp;
        uint256 lock_multiplier; // 6 decimals of precision. 1x = 1000000
    }

    function owner() external view returns (address);
    function stakingToken() external view returns (address);
    function fraxPerLPToken() external view returns (uint256);
    function calcCurCombinedWeight(address account) external view
        returns (
            uint256 old_combined_weight,
            uint256 new_vefxs_multiplier,
            uint256 new_combined_weight
        );
    function lockedStakesOf(address account) external view returns (LockedStake[] memory);
    function lockedStakesOfLength(address account) external view returns (uint256);
    function lockAdditional(bytes32 kek_id, uint256 addl_liq) external;
    function stakeLocked(uint256 liquidity, uint256 secs) external;
    function withdrawLocked(bytes32 kek_id, address destination_address) external;



    function periodFinish() external view returns (uint256);
    function getAllRewardTokens() external view returns (address[] memory);
    function earned(address account) external view returns (uint256[] memory new_earned);
    function totalLiquidityLocked() external view returns (uint256);
    function lockedLiquidityOf(address account) external view returns (uint256);
    function totalCombinedWeight() external view returns (uint256);
    function combinedWeightOf(address account) external view returns (uint256);
    function lockMultiplier(uint256 secs) external view returns (uint256);
    function rewardRates(uint256 token_idx) external view returns (uint256 rwd_rate);

    function userStakedFrax(address account) external view returns (uint256);
    function proxyStakedFrax(address proxy_address) external view returns (uint256);
    function maxLPForMaxBoost(address account) external view returns (uint256);
    function minVeFXSForMaxBoost(address account) external view returns (uint256);
    function minVeFXSForMaxBoostProxy(address proxy_address) external view returns (uint256);
    function veFXSMultiplier(address account) external view returns (uint256 vefxs_multiplier);

    function toggleValidVeFXSProxy(address proxy_address) external;
    function proxyToggleStaker(address staker_address) external;
    function stakerSetVeFXSProxy(address proxy_address) external;
    function getReward(address destination_address) external returns (uint256[] memory);
    function vefxs_max_multiplier() external view returns(uint256);
    function vefxs_boost_scale_factor() external view returns(uint256);
    function vefxs_per_frax_for_max_boost() external view returns(uint256);
    function getProxyFor(address addr) external view returns (address);

    function sync() external;
}

// File: @openzeppelin\contracts\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 make 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;
    }
}

// File: contracts\StakingProxyConvex.sol


pragma solidity 0.8.10;
contract StakingProxyConvex is StakingProxyBase, ReentrancyGuard{
    using SafeERC20 for IERC20;

    address public constant poolRegistry = address(0x7413bFC877B5573E29f964d572f421554d8EDF86);
    address public constant convexCurveBooster = address(0xF403C135812408BFbE8713b5A23a04b3D48AAE31);

    address public curveLpToken;
    address public convexDepositToken;

    constructor() {
    }

    function vaultType() external pure override returns(VaultType){
        return VaultType.Convex;
    }

    function vaultVersion() external pure override returns(uint256){
        return 1;
    }

    //initialize vault
    function initialize(address _owner, address _stakingAddress, address _stakingToken, address _rewardsAddress) external override{
        require(owner == address(0),"already init");

        //set variables
        owner = _owner;
        stakingAddress = _stakingAddress;
        stakingToken = _stakingToken;
        rewards = _rewardsAddress;

        //get tokens from pool info
        (address _lptoken, address _token,,, , ) = ICurveConvex(convexCurveBooster).poolInfo(IConvexWrapper(_stakingToken).convexPoolId());
    
        curveLpToken = _lptoken;
        convexDepositToken = _token;

        //set infinite approvals
        IERC20(_stakingToken).approve(_stakingAddress, type(uint256).max);
        IERC20(_lptoken).approve(_stakingToken, type(uint256).max);
        IERC20(_token).approve(_stakingToken, type(uint256).max);
    }


    //create a new locked state of _secs timelength with a Curve LP token
    function stakeLockedCurveLp(uint256 _liquidity, uint256 _secs) external onlyOwner nonReentrant{
        if(_liquidity > 0){
            //pull tokens from user
            IERC20(curveLpToken).safeTransferFrom(msg.sender, address(this), _liquidity);

            //deposit into wrapper
            IConvexWrapper(stakingToken).deposit(_liquidity, address(this));

            //stake
            IFraxFarmERC20(stakingAddress).stakeLocked(_liquidity, _secs);
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }

    //create a new locked state of _secs timelength with a Convex deposit token
    function stakeLockedConvexToken(uint256 _liquidity, uint256 _secs) external onlyOwner nonReentrant{
        if(_liquidity > 0){
            //pull tokens from user
            IERC20(convexDepositToken).safeTransferFrom(msg.sender, address(this), _liquidity);

            //stake into wrapper
            IConvexWrapper(stakingToken).stake(_liquidity, address(this));

            //stake into frax
            IFraxFarmERC20(stakingAddress).stakeLocked(_liquidity, _secs);
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }

    //create a new locked state of _secs timelength
    function stakeLocked(uint256 _liquidity, uint256 _secs) external onlyOwner nonReentrant{
        if(_liquidity > 0){
            //pull tokens from user
            IERC20(stakingToken).safeTransferFrom(msg.sender, address(this), _liquidity);

            //stake
            IFraxFarmERC20(stakingAddress).stakeLocked(_liquidity, _secs);
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }

    //add to a current lock
    function lockAdditional(bytes32 _kek_id, uint256 _addl_liq) external onlyOwner nonReentrant{
        if(_addl_liq > 0){
            //pull tokens from user
            IERC20(stakingToken).safeTransferFrom(msg.sender, address(this), _addl_liq);

            //add stake
            IFraxFarmERC20(stakingAddress).lockAdditional(_kek_id, _addl_liq);
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }

    //add to a current lock
    function lockAdditionalCurveLp(bytes32 _kek_id, uint256 _addl_liq) external onlyOwner nonReentrant{
        if(_addl_liq > 0){
            //pull tokens from user
            IERC20(curveLpToken).safeTransferFrom(msg.sender, address(this), _addl_liq);

            //deposit into wrapper
            IConvexWrapper(stakingToken).deposit(_addl_liq, address(this));

            //add stake
            IFraxFarmERC20(stakingAddress).lockAdditional(_kek_id, _addl_liq);
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }

    //add to a current lock
    function lockAdditionalConvexToken(bytes32 _kek_id, uint256 _addl_liq) external onlyOwner nonReentrant{
        if(_addl_liq > 0){
            //pull tokens from user
            IERC20(convexDepositToken).safeTransferFrom(msg.sender, address(this), _addl_liq);

            //stake into wrapper
            IConvexWrapper(stakingToken).stake(_addl_liq, address(this));

            //add stake
            IFraxFarmERC20(stakingAddress).lockAdditional(_kek_id, _addl_liq);
        }
        
        //checkpoint rewards
        _checkpointRewards();
    }

    //withdraw a staked position
    function withdrawLocked(bytes32 _kek_id) external onlyOwner nonReentrant{

        //withdraw directly to owner(msg.sender)
        IFraxFarmERC20(stakingAddress).withdrawLocked(_kek_id, msg.sender);

        //checkpoint rewards
        _checkpointRewards();
    }

    //withdraw a staked position
    function withdrawLockedAndUnwrap(bytes32 _kek_id) external onlyOwner nonReentrant{

        //withdraw
        IFraxFarmERC20(stakingAddress).withdrawLocked(_kek_id, address(this));

        //unwrap
        uint256 balance = IERC20(stakingToken).balanceOf(address(this));
        IConvexWrapper(stakingToken).withdrawAndUnwrap(balance);
        IERC20(curveLpToken).transfer(owner,balance);

        //checkpoint rewards
        _checkpointRewards();
    }

    //helper function to combine earned tokens on staking contract and any tokens that are on this vault
    function earned() external view override returns (address[] memory token_addresses, uint256[] memory total_earned) {
        //get list of reward tokens
        address[] memory rewardTokens = IFraxFarmERC20(stakingAddress).getAllRewardTokens();
        uint256[] memory stakedearned = IFraxFarmERC20(stakingAddress).earned(address(this));
        IConvexWrapper.EarnedData[] memory convexrewards = IConvexWrapper(stakingToken).earned(address(this));

        uint256 extraRewardsLength = IRewards(rewards).rewardTokenLength();
        token_addresses = new address[](rewardTokens.length + extraRewardsLength + convexrewards.length);
        total_earned = new uint256[](rewardTokens.length + extraRewardsLength + convexrewards.length);

        //add any tokens that happen to be already claimed but sitting on the vault
        //(ex. withdraw claiming rewards)
        for(uint256 i = 0; i < rewardTokens.length; i++){
            token_addresses[i] = rewardTokens[i];
            total_earned[i] = stakedearned[i] + IERC20(rewardTokens[i]).balanceOf(address(this));
        }

        IRewards.EarnedData[] memory extraRewards = IRewards(rewards).claimableRewards(address(this));
        for(uint256 i = 0; i < extraRewards.length; i++){
            token_addresses[i+rewardTokens.length] = extraRewards[i].token;
            total_earned[i+rewardTokens.length] = extraRewards[i].amount;
        }

        //add convex farm earned tokens
        for(uint256 i = 0; i < convexrewards.length; i++){
            token_addresses[i+rewardTokens.length+extraRewardsLength] = convexrewards[i].token;
            total_earned[i+rewardTokens.length+extraRewardsLength] = convexrewards[i].amount;
        }
    }

    /*
    claim flow:
        claim rewards directly to the vault
        calculate fees to send to fee deposit
        send fxs to booster for fees
        get reward list of tokens that were received
        send all remaining tokens to owner

    A slightly less gas intensive approach could be to send rewards directly to booster and have it sort everything out.
    However that makes the logic a bit more complex as well as runs a few future proofing risks
    */
    function getReward() external override{
        getReward(true);
    }

    //get reward with claim option.
    //_claim bool is for the off chance that rewardCollectionPause is true so getReward() fails but
    //there are tokens on this vault for cases such as withdraw() also calling claim.
    //can also be used to rescue tokens on the vault
    function getReward(bool _claim) public override{

        //claim
        if(_claim){
            //claim frax farm
            IFraxFarmERC20(stakingAddress).getReward(address(this));
            //claim convex farm and forward to owner
            IConvexWrapper(stakingToken).getReward(address(this),owner);
        }

        //process fxs fees
        _processFxs();

        //get list of reward tokens
        address[] memory rewardTokens = IFraxFarmERC20(stakingAddress).getAllRewardTokens();

        //transfer
        _transferTokens(rewardTokens);

        //extra rewards
        _processExtraRewards();
    }

    //auxiliary function to supply token list(save a bit of gas + dont have to claim everything)
    //_claim bool is for the off chance that rewardCollectionPause is true so getReward() fails but
    //there are tokens on this vault for cases such as withdraw() also calling claim.
    //can also be used to rescue tokens on the vault
    function getReward(bool _claim, address[] calldata _rewardTokenList) external override{

        //claim
        if(_claim){
            //claim frax farm
            IFraxFarmERC20(stakingAddress).getReward(address(this));
            //claim convex farm and forward to owner
            IConvexWrapper(stakingToken).getReward(address(this),owner);
        }

        //process fxs fees
        _processFxs();

        //transfer
        _transferTokens(_rewardTokenList);

        //extra rewards
        _processExtraRewards();
    }

}