// File: src/tmp/strategy-saddle-d4-v3.sol



// SPDX-License-Identifier: MIXED

// File src/interfaces/controller.sol
// License-Identifier: MIT

pragma solidity >=0.6.0;

interface IController {
    function jars(address) external view returns (address);

    function rewards() external view returns (address);

    function devfund() external view returns (address);

    function treasury() external view returns (address);

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

    function withdraw(address, uint256) external;

    function withdrawReward(address, uint256) external;

    function earn(address, uint256) external;

    function strategies(address) external view returns (address);
}

// File src/lib/safe-math.sol
// License-Identifier: MIT

pragma solidity >=0.6.0;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File src/lib/context.sol
// License-Identifier: MIT
pragma solidity >=0.6.0;

/*
 * @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 GSN 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 payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File src/lib/erc20.sol
// File: contracts/GSN/Context.sol

// License-Identifier: MIT

pragma solidity >=0.6.0;


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

/**
 * @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: contracts/utils/Address.sol

/**
 * @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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(data);
        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: contracts/token/ERC20/ERC20.sol

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")
        );
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")
        );
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

/**
 * @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 src/strategies/strategy-base-v2.sol
// License-Identifier: MIT
pragma solidity >=0.8.6;


// Strategy Contract Basics

abstract contract StrategyBase {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    // Perfomance fees
    uint256 public performanceTreasuryFee = 0;
    uint256 public constant performanceTreasuryMax = 10000;

    // Withdrawal fee
    uint256 public withdrawalTreasuryFee = 0;
    uint256 public constant withdrawalTreasuryMax = 100000;

    // Tokens
    address public immutable want;
    address public immutable native;
    address[] public activeRewardsTokens;

    // Permissioned accounts
    address public governance;
    address public controller;
    address public strategist;
    address public timelock;
    address public pendingTimelock;
    mapping(address => bool) public harvesters;

    constructor(
        address _want,
        address _native,
        address _governance,
        address _strategist,
        address _controller,
        address _timelock
    ) {
        // Sanity checks
        require(_want != address(0));
        require(_native != address(0));
        require(_governance != address(0));
        require(_strategist != address(0));
        require(_controller != address(0));
        require(_timelock != address(0));

        // Constants assignments
        want = _want;
        native = _native;
        governance = _governance;
        strategist = _strategist;
        controller = _controller;
        timelock = _timelock;
    }

    // **** Modifiers **** //

    modifier onlyHarvester() {
        require(
            harvesters[msg.sender] || msg.sender == strategist || msg.sender == governance || msg.sender == timelock,
            "!harvester"
        );
        _;
    }

    modifier onlyStrategist() {
        require(msg.sender == strategist || msg.sender == governance || msg.sender == timelock, "!strategist");
        _;
    }

    modifier onlyGovernance() {
        require(msg.sender == governance || msg.sender == timelock, "!governance");
        _;
    }

    modifier onlyTimelock() {
        require(msg.sender == timelock, "!timelock");
        _;
    }

    modifier onlyController() {
        require(msg.sender == controller, "!controller");
        _;
    }

    // **** Views **** //

    function balanceOfWant() public view returns (uint256) {
        return IERC20(want).balanceOf(address(this));
    }

    function balanceOfPool() public view virtual returns (uint256) {}

    function balanceOf() public view returns (uint256) {
        return balanceOfWant().add(balanceOfPool());
    }

    function getName() external pure virtual returns (string memory);

    function getHarvestable() external view virtual returns (address[] memory, uint256[] memory);

    /// @notice should be overridden if it needs to be used with callStatic
    function getHarvestableStatic() external virtual returns (address[] memory, uint256[] memory) {
        return this.getHarvestable();
    }

    function getActiveRewardsTokens() external view returns (address[] memory) {
        return activeRewardsTokens;
    }

    // **** Setters **** //

    function whitelistHarvesters(address[] calldata _harvesters) external onlyHarvester {
        for (uint256 i = 0; i < _harvesters.length; i++) {
            harvesters[_harvesters[i]] = true;
        }
    }

    function revokeHarvesters(address[] calldata _harvesters) external onlyStrategist {
        for (uint256 i = 0; i < _harvesters.length; i++) {
            harvesters[_harvesters[i]] = false;
        }
    }

    function setWithdrawalTreasuryFee(uint256 _withdrawalTreasuryFee) external onlyTimelock {
        withdrawalTreasuryFee = _withdrawalTreasuryFee;
    }

    function setPerformanceTreasuryFee(uint256 _performanceTreasuryFee) external onlyTimelock {
        performanceTreasuryFee = _performanceTreasuryFee;
    }

    function setStrategist(address _strategist) external onlyGovernance {
        strategist = _strategist;
    }

    function setGovernance(address _governance) external onlyGovernance {
        governance = _governance;
    }

    function setPendingTimelock(address _pendingTimelock) external onlyTimelock {
        pendingTimelock = _pendingTimelock;
    }

    function acceptTimelock() external {
        require(msg.sender == pendingTimelock, "!pendingTimelock");
        timelock = pendingTimelock;
        pendingTimelock = address(0);
    }

    function setController(address _controller) external onlyTimelock {
        controller = _controller;
    }

    // **** State mutations **** //

    // Adds/updates a swap path from a token to native, normally used for adding/updating a reward path
    function addToNativeRoute(bytes calldata _route) external onlyStrategist {
        _addToNativeRoute(_route);
    }

    function addToTokenRoute(bytes calldata _route) external onlyStrategist {
        _addToTokenRoute(_route);
    }

    function _addToTokenRoute(bytes memory _route) internal virtual;

    function _addToNativeRoute(bytes memory _route) internal virtual;

    function deactivateReward(address _reward) external onlyStrategist {
        for (uint256 i = 0; i < activeRewardsTokens.length; i++) {
            if (activeRewardsTokens[i] == _reward) {
                activeRewardsTokens[i] = activeRewardsTokens[activeRewardsTokens.length - 1];
                activeRewardsTokens.pop();
            }
        }
    }

    function deposit() public virtual;

    // Controller only function for creating additional rewards from dust
    function withdraw(IERC20 _asset) external onlyController returns (uint256 balance) {
        require(want != address(_asset), "want");
        balance = _asset.balanceOf(address(this));
        _asset.safeTransfer(controller, balance);
    }

    // Withdraw partial funds, normally used with a jar withdrawal
    function withdraw(uint256 _amount) external onlyController {
        uint256 _balance = IERC20(want).balanceOf(address(this));
        if (_balance < _amount) {
            _amount = _withdrawSome(_amount.sub(_balance));
            _amount = _amount.add(_balance);
        }

        address _jar = IController(controller).jars(address(want));
        require(_jar != address(0), "!jar"); // additional protection so we don't burn the funds

        IERC20(want).safeTransfer(_jar, _amount);
    }

    // Withdraw all funds, normally used when migrating strategies
    function withdrawAll() external onlyController returns (uint256 balance) {
        _withdrawAll();

        balance = IERC20(want).balanceOf(address(this));

        address _jar = IController(controller).jars(address(want));
        require(_jar != address(0), "!jar"); // additional protection so we don't burn the funds
        IERC20(want).safeTransfer(_jar, balance);
    }

    function _withdrawAll() internal {
        _withdrawSome(balanceOfPool());
    }

    function _withdrawSome(uint256 _amount) internal virtual returns (uint256);

    function harvest() public virtual;

    // **** Emergency functions ****

    function execute(address _target, bytes memory _data) public payable onlyTimelock returns (bytes memory response) {
        require(_target != address(0), "!target");

        // call contract in current context
        assembly {
            let succeeded := delegatecall(sub(gas(), 5000), _target, add(_data, 0x20), mload(_data), 0, 0)
            let size := returndatasize()

            response := mload(0x40)
            mstore(0x40, add(response, and(add(add(size, 0x20), 0x1f), not(0x1f))))
            mstore(response, size)
            returndatacopy(add(response, 0x20), 0, size)

            switch iszero(succeeded)
            case 1 {
                // throw if delegatecall failed
                revert(add(response, 0x20), size)
            }
        }
    }

    function _distributePerformanceFeesNative() internal {
        uint256 _native = IERC20(native).balanceOf(address(this));
        if (_native > 0) {
            // Treasury fees
            IERC20(native).safeTransfer(
                IController(controller).treasury(),
                _native.mul(performanceTreasuryFee).div(performanceTreasuryMax)
            );
        }
    }
}

// File src/interfaces/fraxswap-router.sol
// License-Identifier: GPL-3.0-or-later

pragma solidity >=0.8.0;

interface IFraxswapRouterMultihop {
    /// @notice Input to the swap function
    /// @dev contains the top level info for the swap
    /// @param tokenIn input token address
    /// @param amountIn input token amount
    /// @param tokenOut output token address
    /// @param amountOutMinimum output token minimum amount (reverts if lower)
    /// @param recipient recipient of the output token
    /// @param deadline deadline for this swap transaction (reverts if exceeded)
    /// @param v v value for permit signature if supported
    /// @param r r value for permit signature if supported
    /// @param s s value for permit signature if supported
    /// @param route byte encoded
    struct FraxswapParams {
        address tokenIn;
        uint256 amountIn;
        address tokenOut;
        uint256 amountOutMinimum;
        address recipient;
        uint256 deadline;
        bool approveMax;
        uint8 v;
        bytes32 r;
        bytes32 s;
        bytes route;
    }

    /// @notice A hop along the swap route
    /// @dev a series of swaps (steps) containing the same input token and output token
    /// @param tokenOut output token address
    /// @param amountOut output token amount
    /// @param percentOfHop amount of output tokens from the previous hop going into this hop (10000 = 100%)
    /// @param steps list of swaps from the same input token to the same output token
    /// @param nextHops next hops from this one, the next hops' input token is the tokenOut
    struct FraxswapRoute {
        address tokenOut;
        uint256 amountOut;
        uint256 percentOfHop;
        bytes[] steps;
        bytes[] nextHops;
    }

    /// @notice A swap step in a specific route. routes can have multiple swap steps
    /// @dev a single swap to a token from the token of the previous hop in the route
    /// @param swapType type of the swap performed (Uniswap V2, Fraxswap,Curve, etc)
    /// @param directFundNextPool 0 = funds go via router, 1 = fund are sent directly to pool
    /// @param directFundThisPool 0 = funds go via router, 1 = fund are sent directly to pool
    /// @param tokenOut the target token of the step. output token address
    /// @param pool address of the pool to use in the step
    /// @param extraParam1 extra data used in the step
    /// @param extraParam2 extra data used in the step
    /// @param percentOfHop percentage of all of the steps in this route (hop)
    struct FraxswapStepData {
        uint8 swapType;
        uint8 directFundNextPool;
        uint8 directFundThisPool;
        address tokenOut;
        address pool;
        uint256 extraParam1;
        uint256 extraParam2;
        uint256 percentOfHop;
    }

    function swap(FraxswapParams memory params) external payable returns (uint256 amountOut);
}

// File src/interfaces/uniswapv2.sol
// License-Identifier: MIT
pragma solidity >=0.6.2;

interface UniswapRouterV2 {
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);
}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function getPair(address tokenA, address tokenB) external view returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function createPair(address tokenA, address tokenB) external returns (address pair);
}

// File src/interfaces/curve.sol
// License-Identifier: MIT
pragma solidity >=0.6.7;

interface ICurveFi_2 {
    function get_virtual_price() external view returns (uint256);

    function add_liquidity(uint256[2] calldata amounts, uint256 min_mint_amount) external;

    function remove_liquidity_imbalance(uint256[2] calldata amounts, uint256 max_burn_amount) external;

    function remove_liquidity(uint256 _amount, uint256[2] calldata amounts) external;

    function exchange(
        int128 from,
        int128 to,
        uint256 _from_amount,
        uint256 _min_to_amount
    ) external;

    function balances(int128) external view returns (uint256);
}

interface ICurveFi_3 {
    function get_virtual_price() external view returns (uint256);

    function add_liquidity(uint256[3] calldata amounts, uint256 min_mint_amount) external;

    function remove_liquidity_imbalance(uint256[3] calldata amounts, uint256 max_burn_amount) external;

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

    function exchange(
        int128 from,
        int128 to,
        uint256 _from_amount,
        uint256 _min_to_amount
    ) external;

    function balances(uint256) external view returns (uint256);
}

interface ICurveFi_4 {
    function get_virtual_price() external view returns (uint256);

    function add_liquidity(uint256[4] calldata amounts, uint256 min_mint_amount) external;

    // stETH pool
    function add_liquidity(uint256[2] calldata amounts, uint256 min_mint_amount) external payable;

    function remove_liquidity_imbalance(uint256[4] calldata amounts, uint256 max_burn_amount) external;

    function remove_liquidity(uint256 _amount, uint256[4] calldata amounts) external;

    function exchange(
        int128 from,
        int128 to,
        uint256 _from_amount,
        uint256 _min_to_amount
    ) external;

    function exchange_underlying(
        int128 from,
        int128 to,
        uint256 _from_amount,
        uint256 _min_to_amount
    ) external;

    function balances(int128) external view returns (uint256);
}

interface ICurveZap_4 {
    function add_liquidity(uint256[4] calldata uamounts, uint256 min_mint_amount) external;

    function remove_liquidity(uint256 _amount, uint256[4] calldata min_uamounts) external;

    function remove_liquidity_imbalance(uint256[4] calldata uamounts, uint256 max_burn_amount) external;

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

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

    function remove_liquidity_one_coin(
        uint256 _token_amount,
        int128 i,
        uint256 min_uamount,
        bool donate_dust
    ) external;

    function withdraw_donated_dust() external;

    function coins(int128 arg0) external returns (address);

    function underlying_coins(int128 arg0) external returns (address);

    function curve() external returns (address);

    function token() external returns (address);
}

interface ICurveZap {
    function remove_liquidity_one_coin(
        uint256 _token_amount,
        int128 i,
        uint256 min_uamount
    ) external;
}

interface ICurveFi_Polygon_3 {
    function get_virtual_price() external view returns (uint256);

    function add_liquidity(uint256[3] calldata amounts, uint256 min_mint_amount) external;

    function add_liquidity(
        uint256[3] calldata amounts,
        uint256 min_mint_amount,
        bool use_underlying
    ) external;

    function remove_liquidity_imbalance(uint256[3] calldata amounts, uint256 max_burn_amount) external;

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

    function exchange(
        int128 from,
        int128 to,
        uint256 _from_amount,
        uint256 _min_to_amount
    ) external;

    function balances(uint256) external view returns (uint256);
}

interface ICurveGauge {
    function deposit(uint256 _value) external;

    function deposit(uint256 _value, address addr) external;

    function balanceOf(address arg0) external view returns (uint256);

    function withdraw(uint256 _value) external;

    function withdraw(uint256 _value, bool claim_rewards) external;

    function claim_rewards() external;

    function claim_rewards(address addr) external;

    function claimable_tokens(address addr) external returns (uint256);

    function claimable_reward(address addr) external view returns (uint256);

    function claimable_reward(address, address) external view returns (uint256);

    function integrate_fraction(address arg0) external view returns (uint256);
}

interface ICurveMintr {
    function mint(address) external;

    function minted(address arg0, address arg1) external view returns (uint256);
}

interface ICurveVotingEscrow {
    function locked(address arg0) external view returns (int128 amount, uint256 end);

    function locked__end(address _addr) external view returns (uint256);

    function create_lock(uint256, uint256) external;

    function increase_amount(uint256) external;

    function increase_unlock_time(uint256 _unlock_time) external;

    function withdraw() external;

    function smart_wallet_checker() external returns (address);
}

interface ICurveSmartContractChecker {
    function wallets(address) external returns (bool);

    function approveWallet(address _wallet) external;
}

// File src/strategies/saddle/strategy-saddle-d4-v3.sol
// License-Identifier: MIT
pragma solidity >=0.8.6;



interface SwapFlashLoan {
    function addLiquidity(
        uint256[] calldata amounts,
        uint256 minToMint,
        uint256 deadline
    ) external;
}

contract StrategySaddleD4 is StrategyBase {
    using SafeMath for uint256;

    // Tokens
    address private frax = 0x853d955aCEf822Db058eb8505911ED77F175b99e;
    address private reward = 0xf1Dc500FdE233A4055e25e5BbF516372BC4F6871; // sdl token
    address private constant _native = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    // Protocol info
    address public constant gauge = 0x702c1b8Ec3A77009D5898e18DA8F8959B6dF2093;
    address public constant minter = 0x358fE82370a1B9aDaE2E3ad69D6cF9e503c96018;
    address private constant saddle_d4lp = 0xd48cF4D7FB0824CC8bAe055dF3092584d0a1726A;
    address private flashLoan = 0xC69DDcd4DFeF25D8a793241834d4cc4b3668EAD6;

    address private constant fraxswapRouterMultihop = 0x25e9acA5951262241290841b6f863d59D37DC4f0;
    address private constant sushiRouter = 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F;

    mapping(address => IFraxswapRouterMultihop.FraxswapParams) private nativeToTokenRoutes;
    mapping(address => address[]) private toNativeRoutes;

    constructor(
        address _governance,
        address _strategist,
        address _controller,
        address _timelock
    ) StrategyBase(saddle_d4lp, _native, _governance, _strategist, _controller, _timelock) {
        // Performance fees
        performanceTreasuryFee = 2000;

        // Approvals
        IERC20(native).approve(fraxswapRouterMultihop, type(uint256).max);
        IERC20(frax).approve(flashLoan, type(uint256).max);
        IERC20(want).approve(gauge, type(uint256).max);

        // Native to Frax
        IFraxswapRouterMultihop.FraxswapStepData memory _step = IFraxswapRouterMultihop.FraxswapStepData({
            swapType: 0,
            directFundNextPool: 0,
            directFundThisPool: 0,
            tokenOut: frax,
            pool: 0x31351Bf3fba544863FBff44DDC27bA880916A199,
            extraParam1: 1,
            extraParam2: 0,
            percentOfHop: 10000
        });

        bytes[] memory _steps = new bytes[](1);
        _steps[0] = abi.encode(_step);

        IFraxswapRouterMultihop.FraxswapRoute memory _nextRoute = IFraxswapRouterMultihop.FraxswapRoute({
            tokenOut: frax,
            amountOut: 0,
            percentOfHop: 10000,
            steps: _steps,
            nextHops: new bytes[](0)
        });

        bytes[] memory _nextHops = new bytes[](1);
        _nextHops[0] = abi.encode(_nextRoute);

        IFraxswapRouterMultihop.FraxswapRoute memory _route = IFraxswapRouterMultihop.FraxswapRoute({
            tokenOut: address(0),
            amountOut: 0,
            percentOfHop: 10000,
            steps: new bytes[](0),
            nextHops: _nextHops
        });

        IFraxswapRouterMultihop.FraxswapParams memory _params = IFraxswapRouterMultihop.FraxswapParams({
            tokenIn: native,
            amountIn: 0,
            tokenOut: frax,
            amountOutMinimum: 0,
            recipient: address(this),
            deadline: block.timestamp,
            approveMax: false,
            v: 0,
            r: "0x",
            s: "0x",
            route: abi.encode(_route)
        });
        _addToTokenRoute(abi.encode(frax, _params));

        // Reward to native
        address[] memory _rewardToNative = new address[](2);
        _rewardToNative[0] = reward;
        _rewardToNative[1] = native;
        _addToNativeRoute(abi.encode(_rewardToNative));
    }

    function getName() external pure override returns (string memory) {
        return "StrategySaddleD4v2";
    }

    function balanceOfPool() public view override returns (uint256) {
        return ICurveGauge(gauge).balanceOf(address(this));
    }

    /// @notice callStatic on this
    function getHarvestableStatic() external override returns (address[] memory, uint256[] memory) {
        address[] memory rewardTokens = new address[](1);
        uint256[] memory pendingRewards = new uint256[](1);

        rewardTokens[0] = reward;
        pendingRewards[0] = ICurveGauge(gauge).claimable_tokens(address(this));

        return (rewardTokens, pendingRewards);
    }

    function getToNativeRoute(address _token) external view returns (bytes memory route) {
        route = abi.encode(toNativeRoutes[_token]);
    }

    function getToTokenRoute(address _token) external view returns (bytes memory route) {
        route = abi.encode(nativeToTokenRoutes[_token]);
    }

    // **** Setters ****

    // **** State mutations **** //

    function deposit() public override {
        uint256 _want = IERC20(want).balanceOf(address(this));
        if (_want > 0) {
            ICurveGauge(gauge).deposit(_want);
        }
    }

    function _withdrawSome(uint256 _amount) internal override returns (uint256) {
        ICurveGauge(gauge).withdraw(_amount);
        return _amount;
    }

    function harvest() public override {
        // Collects rewards tokens
        _harvestReward();

        // loop through all rewards tokens and swap the ones with toNativeRoutes.
        _swapActiveRewardsToNative();

        // Collect Fees
        _distributePerformanceFeesNative();

        uint256 _nativeBalance = IERC20(native).balanceOf(address(this));
        if (_nativeBalance == 0) {
            return;
        }

        // Swap native to frax
        _swapNativeToDeposit(_nativeBalance);

        // Adds in liquidity
        _addLiquidity();

        // Stake
        deposit();
    }

    function _harvestReward() internal {
        ICurveGauge(gauge).claim_rewards(address(this));
        ICurveMintr(minter).mint(address(gauge));
    }

    function _swapActiveRewardsToNative() internal {
        for (uint256 i = 0; i < activeRewardsTokens.length; i++) {
            uint256 _rewardToken = IERC20(activeRewardsTokens[i]).balanceOf(address(this));
            if (toNativeRoutes[activeRewardsTokens[i]].length > 0 && _rewardToken > 0) {
                _swapSushiswapWithPath(toNativeRoutes[activeRewardsTokens[i]], _rewardToken);
            }
        }
    }

    function _swapNativeToDeposit(uint256 _amountIn) internal {
        IFraxswapRouterMultihop.FraxswapParams memory _params = nativeToTokenRoutes[frax];
        _params.amountIn = _amountIn;
        _params.deadline = block.timestamp.add(60);

        IFraxswapRouterMultihop(fraxswapRouterMultihop).swap(_params);
    }

    function _addLiquidity() internal {
        uint256[] memory amounts = new uint256[](4);
        amounts[2] = IERC20(frax).balanceOf(address(this));
        SwapFlashLoan(flashLoan).addLiquidity(amounts, 0, block.timestamp);
    }

    function _swapSushiswapWithPath(address[] memory path, uint256 _amount) internal {
        require(path[1] != address(0));

        UniswapRouterV2(sushiRouter).swapExactTokensForTokens(_amount, 0, path, address(this), block.timestamp.add(60));
    }

    /// @notice this works exclusively with Fraxswap multihop router v2
    function _addToTokenRoute(bytes memory _route) internal override {
        (address _token, IFraxswapRouterMultihop.FraxswapParams memory _params) = abi.decode(
            _route,
            (address, IFraxswapRouterMultihop.FraxswapParams)
        );

        // Delete the old route
        delete nativeToTokenRoutes[_token];

        nativeToTokenRoutes[_token] = _params;
    }

    /// @notice this works exclusively with Sushiswap legacy router
    function _addToNativeRoute(bytes memory _route) internal override {
        address[] memory _path = abi.decode(_route, (address[]));

        address _token = _path[0];

        if (toNativeRoutes[_token].length == 0) {
            activeRewardsTokens.push(_token);
        } else {
            delete toNativeRoutes[_token];
        }

        IERC20(_token).approve(sushiRouter, type(uint256).max);
        toNativeRoutes[_token] = _path;
    }

    function getHarvestable() external view override returns (address[] memory, uint256[] memory) {
        address[] memory rewardTokens = new address[](1);
        uint256[] memory pendingRewards = new uint256[](1);

        rewardTokens[0] = reward;
        pendingRewards[0] = 0;

        return (rewardTokens, pendingRewards);
    }
}