// File: contracts/investments/frax-gauge/tranche/TrancheRegistry.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (investments/frax-gauge/tranche/TrancheRegistry.sol)

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/proxy/Clones.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "../../../interfaces/investments/frax-gauge/tranche/ITranche.sol";
import "../../../interfaces/investments/frax-gauge/tranche/ITrancheRegistry.sol";

import "../../../common/access/Operators.sol";
import "../../../common/Executable.sol";
import "../../../common/CommonEventsAndErrors.sol";

/**
  * @notice A Tranch Registry which can create new tranches, and perform some operations on the tranches
  * it has created and initialized.
  * 
  * @dev Each new tranche is cloned from a template implementation which is statically deployed
  * once and added here (addTrancheImpl).
  *
  * Owner: STAX multisig
  * Operators: Liquidity Ops (needs to create new tranches)
 */
contract TrancheRegistry is ITrancheRegistry, Ownable, Operators {
    using SafeERC20 for IERC20;

    // Note these have a custom getter as the function is in the interface (so needs to be explicitly defined)
    mapping(uint256 => ImplementationDetails) private _implDetails;
    uint256 public implDetailsLength;

    // implId -> tranche array
    mapping(uint256 => address[]) public trancheList; 
        
    // tranche address -> was created from this registry
    mapping(address => bool) public allTranches;

    /// @notice Retrieve the implementation details for a given tranche ID
    function implDetails(uint256 _implId) external view override onlyValidImplId(_implId) returns (ImplementationDetails memory details) {
        return _implDetails[_implId];
    }

    /// @notice The list of all known created tranche instances in the registry
    function trancheListLength(uint256 _implId) external view onlyValidImplId(_implId) returns (uint256 length) {
        return trancheList[_implId].length;
    }

    /// @notice Whether a given address is a tranche that this registry created.
    function createdTranche(address trancheAddress) external  view returns (bool) {
        return allTranches[trancheAddress];
    }

    /// @notice Disable/Enable a particular tranche implementation ID template from future use.
    /// @dev New createTranche() calls on this ID will fail.
    function setImplDisabled(uint256 _implId, bool _isDisabled) external  onlyOperators onlyValidImplId(_implId) {
        _implDetails[_implId].disabled = _isDisabled;
        emit ImplementationDisabled(_implId, _isDisabled);
    }

    /// @notice Disable/Enable a particular tranche instance which was created by this registry.
    function setTrancheDisabled(address _tranche, bool _isDisabled) external onlyOperators {
        ITranche(_tranche).setDisabled(_isDisabled);
    }

    /// @notice Update the registry on a particular tranche instance - eg on registry upgrade.
    function updateRegistryOnTranche(address _tranche, address _registry) external onlyOperators {
        ITranche(_tranche).setRegistry(_registry);
    }

    /// @notice Close a given tranche template ID from being staked into in future.
    /// @dev Withdraws are still allowed upon expiry.
    function closeImplForStaking(uint256 _implId, bool _value) external  onlyOperators onlyValidImplId(_implId) {
        _implDetails[_implId].closedForStaking = _value;
        emit ImplementationClosedForStaking(_implId, _value);
    }

    /// @notice Add a new tranche template implementation.
    function addTrancheImpl(address _implementation) external  onlyOperators {
        if (_implementation == address(0)) revert CommonEventsAndErrors.InvalidAddress(_implementation);

        _implDetails[implDetailsLength] = ImplementationDetails({
            implementation: _implementation,
            closedForStaking: false,
            disabled: false
        });
        
        emit TrancheImplCreated(implDetailsLength, _implementation);
        implDetailsLength++;
    }

    /// @notice Operators (eg liquidity ops) can create new tranches for a particular tranche implementation id.
    function createTranche(uint256 _implId) external override onlyOperators onlyValidImplId(_implId) returns (address tranche, address stakingAddress, address stakingToken)  {       
        // Clone the implementation, if it's valid
        {
            ImplementationDetails storage details = _implDetails[_implId];

            if (details.disabled) revert InvalidTrancheImpl(_implId);
            tranche = Clones.clone(details.implementation);
        }

        // Add into the registry.
        trancheList[_implId].push(tranche);
        allTranches[tranche] = true;

        // Set the owner of the new tranche to the caller.
        (stakingAddress, stakingToken) = ITranche(tranche).initialize(address(this), _implId, msg.sender);

        emit TrancheCreated(_implId, tranche, stakingAddress, stakingToken);
    }

    /// @dev In case of registry upgrade - owner of the new registry can add existing tranches
    /// after setting up the unique implId in addTrancheImpl()
    function addExistingTranche(uint256 _implId, address _tranche) external onlyOwner onlyValidImplId(_implId) {
        if (_tranche == address(0)) revert CommonEventsAndErrors.InvalidAddress(_tranche);
        if (allTranches[_tranche]) revert TrancheAlreadyExists(_tranche);
        if (ITranche(_tranche).disabled()) revert ITranche.InactiveTranche(_tranche);

        trancheList[_implId].push(_tranche);
        allTranches[_tranche] = true;
        emit AddedExistingTranche(_implId, _tranche);
    }

    function addOperator(address _address) external override onlyOwner {
        _addOperator(_address);
    }

    function removeOperator(address _address) external override onlyOwner {
        _removeOperator(_address);
    }

    /// @notice Owner can recover tokens
    function recoverToken(address _token, address _to, uint256 _amount) external onlyOwner {
        IERC20(_token).safeTransfer(_to, _amount);
        emit CommonEventsAndErrors.TokenRecovered(_to, _token, _amount);
    }

    /**
      * Owner (msig), Operator (liquidity ops), and the tranches which this registry created can call.
      * 
      * The ConvexVaultTranche implementation needs to whitelist the tranche such that it's allowed on Convex
      * to create new vaults.
      *
      * This needs to be done from a fixed/known address which is granted an operator role upfront.
      *   Eg: TrancheRegistry is given operator access to call on ConvexVaultOps.setAllowedAddress()
      */
    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external override returns (bytes memory) {
        // Onwer, operator, or tranche that this registry created
        if (msg.sender != owner() && !operators[msg.sender] && !allTranches[msg.sender])
            revert OnlyOwnerOperatorTranche(msg.sender);

        return Executable.execute(_to, _value, _data);
    }

    modifier onlyValidImplId(uint256 _implId) {
        if (_implId >= implDetailsLength || _implDetails[_implId].implementation == address(0)) revert InvalidTrancheImpl(_implId);
        _;
    }
}
// File: @openzeppelin/contracts/access/Ownable.sol



// 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);
    }
}

// File: @openzeppelin/contracts/proxy/Clones.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/Clones.sol)

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
            instance := create(0, ptr, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
            instance := create2(0, ptr, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
            mstore(add(ptr, 0x14), shl(0x60, implementation))
            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
            mstore(add(ptr, 0x38), shl(0x60, deployer))
            mstore(add(ptr, 0x4c), salt)
            mstore(add(ptr, 0x6c), keccak256(ptr, 0x37))
            predicted := keccak256(add(ptr, 0x37), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(address implementation, bytes32 salt)
        internal
        view
        returns (address predicted)
    {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// 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");
        }
    }
}

// File: contracts/interfaces/investments/frax-gauge/tranche/ITranche.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (interfaces/investments/frax-gauge/tranche/ITranche.sol)

import "../../../external/frax/IFraxGauge.sol";

interface ITranche {
    enum TrancheType {
        DIRECT,
        CONVEX_VAULT
    }

    event RegistrySet(address indexed registry);
    event SetDisabled(bool isDisabled);
    event RewardClaimed(address indexed trancheAddress, uint256[] rewardData);
    event AdditionalLocked(address indexed staker, bytes32 kekId, uint256 liquidity);
    event VeFXSProxySet(address indexed proxy);
    event MigratorToggled(address indexed migrator);

    error InactiveTranche(address tranche);
    error AlreadyInitialized();
    
    function disabled() external view returns (bool);
    function willAcceptLock(uint256 liquidity) external view returns (bool);
    function lockedStakes() external view returns (IFraxGauge.LockedStake[] memory);

    function initialize(address _registry, uint256 _fromImplId, address _newOwner) external returns (address, address);
    function setRegistry(address _registry) external;
    function setDisabled(bool isDisabled) external;
    function setVeFXSProxy(address _proxy) external;
    function toggleMigrator(address migrator_address) external;

    function stake(uint256 liquidity, uint256 secs) external returns (bytes32 kek_id);
    function withdraw(bytes32 kek_id, address destination_address) external returns (uint256 withdrawnAmount);
    function getRewards(address[] calldata rewardTokens) external returns (uint256[] memory rewardAmounts);
}
// File: contracts/interfaces/investments/frax-gauge/tranche/ITrancheRegistry.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (interfaces/investments/frax-gauge/tranche/ITrancheRegistry.sol)

interface ITrancheRegistry {
    struct ImplementationDetails {
        // The reference tranche implementation which is to be cloned
        address implementation;

        // If true, new/additional locks cannot be added into this tranche type
        bool closedForStaking;

        // If true, no staking allowed and these tranches have no rewards
        // to claim or tokens to withdraw. So fully deprecated.
        bool disabled;
    }

    event TrancheCreated(uint256 indexed implId, address indexed tranche, address stakingAddress, address stakingToken);
    event TrancheImplCreated(uint256 indexed implId, address indexed implementation);
    event ImplementationDisabled(uint256 indexed implId, bool value);
    event ImplementationClosedForStaking(uint256 indexed implId, bool value);
    event AddedExistingTranche(uint256 indexed implId, address indexed tranche);

    error OnlyOwnerOperatorTranche(address caller);
    error InvalidTrancheImpl(uint256 implId);
    error TrancheAlreadyExists(address tranche);
    error UnknownTranche(address tranche);

    function createTranche(uint256 _implId) external returns (address tranche, address underlyingGaugeAddress, address stakingToken);
    function implDetails(uint256 _implId) external view returns (ImplementationDetails memory details);
    function execute(address _to, uint256 _value, bytes calldata _data) external returns (bytes memory);
}
// File: contracts/common/access/Operators.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (common/access/Operators.sol)

/// @notice Inherit to add an Operator role which multiple addreses can be granted.
/// @dev Derived classes to implement addOperator() and removeOperator()
abstract contract Operators {
    /// @notice A set of addresses which are approved to run operations.
    mapping(address => bool) public operators;

    event AddedOperator(address indexed account);
    event RemovedOperator(address indexed account);

    error OnlyOperators(address caller);

    function _addOperator(address _account) internal {
        operators[_account] = true;
        emit AddedOperator(_account);
    }

    /// @notice Grant `_account` the operator role
    /// @dev Derived classes to implement and add protection on who can call
    function addOperator(address _account) external virtual;

    function _removeOperator(address _account) internal {
        delete operators[_account];
        emit RemovedOperator(_account);
    }

    /// @notice Revoke the operator role from `_account`
    /// @dev Derived classes to implement and add protection on who can call
    function removeOperator(address _account) external virtual;

    modifier onlyOperators() {
        if (!operators[msg.sender]) revert OnlyOperators(msg.sender);
        _;
    }
}

// File: contracts/common/Executable.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (common/Executable.sol)

/// @notice An inlined library function to add a generic execute() function to contracts.
/// @dev As this is a powerful funciton, care and consideration needs to be taken when 
///      adding into contracts, and on who can call.
library Executable {
    error UnknownFailure();

    /// @notice Call a function on another contract, where the msg.sender will be this contract
    /// @param _to The address of the contract to call
    /// @param _value Any eth to send
    /// @param _data The encoded function selector and args.
    /// @dev If the underlying function reverts, this willl revert where the underlying revert message will bubble up.
    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = _to.call{value: _value}(_data);
        
        if (success) {
            return returndata;
        } else if (returndata.length > 0) {
            // Look for revert reason and bubble it up if present
            // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol#L232
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert UnknownFailure();
        }
    }
}
// File: contracts/common/CommonEventsAndErrors.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (common/CommonEventsAndErrors.sol)

/// @notice A collection of common errors thrown within the STAX contracts
library CommonEventsAndErrors {
    error InsufficientBalance(address token, uint256 required, uint256 balance);
    error InvalidToken(address token);
    error InvalidParam();
    error InvalidAddress(address addr);
    error OnlyOwner(address caller);
    error OnlyOwnerOrOperators(address caller);

    event TokenRecovered(address indexed to, address indexed token, uint256 amount);
}

// File: @openzeppelin/contracts/utils/Context.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// 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);
            }
        }
    }
}

// File: contracts/interfaces/external/frax/IFraxGauge.sol



pragma solidity ^0.8.4;
// SPDX-License-Identifier: AGPL-3.0-or-later
// STAX (interfaces/external/curve/IFraxGauge.sol)

// ref: https://github.com/FraxFinance/frax-solidity/blob/master/src/hardhat/contracts/Staking/FraxUnifiedFarm_ERC20.sol

interface IFraxGauge {
    struct LockedStake {
        bytes32 kek_id;
        uint256 start_timestamp;
        uint256 liquidity;
        uint256 ending_timestamp;
        uint256 lock_multiplier; // 6 decimals of precision. 1x = 1000000
    }

    function stakeLocked(uint256 liquidity, uint256 secs) external;
    function lockAdditional(bytes32 kek_id, uint256 addl_liq) external;
    function withdrawLocked(bytes32 kek_id, address destination_address) external;

    function lockedStakesOf(address account) external view returns (LockedStake[] memory);
    function getAllRewardTokens() external view returns (address[] memory);
    function getReward(address destination_address) external returns (uint256[] memory);

    function stakerSetVeFXSProxy(address proxy_address) external;
    function stakerToggleMigrator(address migrator_address) external;

    function lock_time_min() external view returns (uint256);
    function lock_time_for_max_multiplier() external view returns (uint256);
}