Contract Address Details

// Sources flattened with hardhat v2.8.3 https://hardhat.org

// File @openzeppelin-4/contracts/token/ERC20/IERC20.sol@v4.7.2


// 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-4/contracts/token/ERC20/extensions/IERC20Metadata.sol@v4.7.2


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}


// File @openzeppelin-4/contracts/utils/Context.sol@v4.7.2


// 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-4/contracts/token/ERC20/ERC20.sol@v4.7.2


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;



/**
 * @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 Contracts guidelines: functions revert
 * instead 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, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 this function is
     * overridden;
     *
     * 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 virtual override returns (uint8) {
        return 18;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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:
     *
     * - `account` 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 += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @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 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}


// File @openzeppelin-4/contracts/token/ERC20/extensions/draft-IERC20Permit.sol@v4.7.2


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}


// File @openzeppelin-4/contracts/utils/Address.sol@v4.7.2


// OpenZeppelin Contracts (last updated v4.7.0) (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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File @openzeppelin-4/contracts/token/ERC20/utils/SafeERC20.sol@v4.7.2


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;



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

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

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

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

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

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

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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/BIFI/interfaces/sushi/ITridentRouter.sol



pragma solidity >=0.6.0 <0.9.0;
pragma experimental ABIEncoderV2;

interface ITridentRouter {
    struct Path {
        address pool;
        bytes data;
    }

    struct ExactInputParams {
        address tokenIn;
        uint256 amountIn;
        uint256 amountOutMinimum;
        Path[] path;
    }

    struct ExactInputSingleParams {
        uint256 amountIn;
        uint256 amountOutMinimum;
        address pool;
        address tokenIn;
        bytes data;
    }

    struct TokenInput {
        address token;
        bool native;
        uint256 amount;
    }

    function exactInputWithNativeToken(ExactInputParams calldata params) external returns (uint256 amountOut);

    function exactInputSingleWithNativeToken(
        ExactInputSingleParams calldata params
    ) external returns (uint256 amountOut);

    function addLiquidity(
        TokenInput[] calldata tokenInput,
        address pool,
        uint256 minLiquidity,
        bytes calldata data
    ) external returns (uint256 liquidity);

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


// File contracts/BIFI/interfaces/sushi/IBentoPool.sol



pragma solidity ^0.8.0;

interface IBentoPool {
    struct TokenAmount {
        address token;
        uint256 amount;
    }
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getAmountOut(bytes calldata data) external view returns (uint256 finalAmountOut);
    function getNativeReserves() external view returns (
        uint256 _nativeReserve0,
        uint256 _nativeReserve1,
        uint32 _blockTimestampLast
    );
    function burn(
        bytes calldata data
    ) external returns (TokenAmount[] memory withdrawnAmounts);
}


// File contracts/BIFI/interfaces/sushi/IBentoBox.sol



pragma solidity >=0.6.0 <0.9.0;

interface IBentoBox {
    function setMasterContractApproval(
        address user,
        address masterContract,
        bool approved,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}


// File contracts/BIFI/interfaces/sushi/IMiniChefV2.sol



pragma solidity >0.6.0;

interface IMiniChefV2 {
    function poolLength() external view returns (uint256);
    function userInfo(uint256 _pid, address _user) external view returns (uint256, uint256);
    function pendingSushi(uint256 _pid, address _user) external view returns (uint256);
    function deposit(uint256 pid, uint256 amount, address to) external;
    function withdraw(uint256 pid, uint256 amount, address to) external;
    function harvest(uint256 pid, address to) external;
    function withdrawAndHarvest(uint256 pid, uint256 amount, address to) external;
    function emergencyWithdraw(uint256 pid, address to) external;
    function rewarder(uint256 pid) external view returns (address);
}


// File contracts/BIFI/interfaces/sushi/IRewarder.sol



pragma solidity >0.6.0;

interface IRewarder {
    function poolLength() external view returns (uint256);
    function userInfo(uint256 _pid, address _user) external view returns (uint256, uint256);
    function pendingToken(uint256 _pid, address _user) external view returns (uint256);
    function deposit(uint256 pid, uint256 amount, address to) external;
    function withdraw(uint256 pid, uint256 amount, address to) external;
    function harvest(uint256 pid, address to) external;
    function withdrawAndHarvest(uint256 pid, uint256 amount, address to) external;
    function emergencyWithdraw(uint256 pid, address to) external;
}


// File @openzeppelin-4/contracts/access/Ownable.sol@v4.7.2


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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-4/contracts/security/Pausable.sol@v4.7.2


// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

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

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

    bool private _paused;

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

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

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

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

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

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


// File contracts/BIFI/interfaces/common/IPhotonFeeConfig.sol



pragma solidity ^0.8.0;

interface IPhotonFeeConfig {
    struct FeeCategory {
        uint256 total;
        uint256 photon;
        uint256 call;
        uint256 strategist;
        string label;
        bool active;
    }
    function getFees(address strategy) external view returns (FeeCategory memory);
    function stratFeeId(address strategy) external view returns (uint256);
    function setStratFeeId(uint256 feeId) external;
}


// File contracts/BIFI/strategies/Common/PhotonStratFeeManager.sol



pragma solidity ^0.8.0;



contract PhotonStratFeeManager is Ownable, Pausable {

    struct CommonAddresses {
        address vault;
        address unirouter;
        address keeper;
        address strategist;
        address photonFeeRecipient;
        address photonFeeConfig;
    }

    // common addresses for the strategy
    address public vault;
    address public unirouter;
    address public keeper;
    address public strategist;
    address public photonFeeRecipient;
    IPhotonFeeConfig public photonFeeConfig;

    uint256 constant DIVISOR = 1 ether;
    uint256 constant public WITHDRAWAL_FEE_CAP = 50;
    uint256 constant public WITHDRAWAL_MAX = 10000;
    uint256 public withdrawalFee = 10;

    event SetStratFeeId(uint256 feeId);
    event SetWithdrawalFee(uint256 withdrawalFee);
    event SetVault(address vault);
    event SetUnirouter(address unirouter);
    event SetKeeper(address keeper);
    event SetStrategist(address strategist);
    event SetPhotonFeeRecipient(address photonFeeRecipient);
    event SetPhotonFeeConfig(address photonFeeConfig);

    constructor(
        CommonAddresses memory _commonAddresses
    ) {
        vault = _commonAddresses.vault;
        unirouter = _commonAddresses.unirouter;
        keeper = _commonAddresses.keeper;
        strategist = _commonAddresses.strategist;
        photonFeeRecipient = _commonAddresses.photonFeeRecipient;
        photonFeeConfig = IPhotonFeeConfig(_commonAddresses.photonFeeConfig);
    }

    // checks that caller is either owner or keeper.
    modifier onlyManager() {
        require(msg.sender == owner() || msg.sender == keeper, "!manager");
        _;
    }

    // fetch fees from config contract
    function getFees() public view returns (IPhotonFeeConfig.FeeCategory memory) {
        return photonFeeConfig.getFees(address(this));
    }

    function getStratFeeId() external view returns (uint256) {
        return photonFeeConfig.stratFeeId(address(this));
    }

    function setStratFeeId(uint256 _feeId) external onlyManager {
        photonFeeConfig.setStratFeeId(_feeId);
        emit SetStratFeeId(_feeId);
    }

    // adjust withdrawal fee
    function setWithdrawalFee(uint256 _fee) public onlyManager {
        require(_fee <= WITHDRAWAL_FEE_CAP, "!cap");
        withdrawalFee = _fee;
        emit SetWithdrawalFee(_fee);
    }

    // set new vault (only for strategy upgrades)
    function setVault(address _vault) external onlyOwner {
        vault = _vault;
        emit SetVault(_vault);
    }

    // set new unirouter
    function setUnirouter(address _unirouter) external onlyOwner {
        unirouter = _unirouter;
        emit SetUnirouter(_unirouter);
    }

    // set new keeper to manage strat
    function setKeeper(address _keeper) external onlyManager {
        keeper = _keeper;
        emit SetKeeper(_keeper);
    }

    // set new strategist address to receive strat fees
    function setStrategist(address _strategist) external {
        require(msg.sender == strategist, "!strategist");
        strategist = _strategist;
        emit SetStrategist(_strategist);
    }

    // set new photon fee address to receive photon fees
    function setPhotonFeeRecipient(address _photonFeeRecipient) external onlyOwner {
        photonFeeRecipient = _photonFeeRecipient;
        emit SetPhotonFeeRecipient(_photonFeeRecipient);
    }

    // set new fee config address to fetch fees
    function setPhotonFeeConfig(address _photonFeeConfig) external onlyOwner {
        photonFeeConfig = IPhotonFeeConfig(_photonFeeConfig);
        emit SetPhotonFeeConfig(_photonFeeConfig);
    }

    function beforeDeposit() external virtual {}
}


// File contracts/BIFI/utils/IGasPrice.sol



pragma solidity >=0.6.0 <0.9.0;

interface IGasPrice {
    function maxGasPrice() external returns (uint);
}


// File contracts/BIFI/utils/GasFeeThrottler.sol



pragma solidity ^0.8.0;


contract GasFeeThrottler {

    bool public shouldGasThrottle = true;

    address public gasprice = address(0xA43509661141F254F54D9A326E8Ec851A0b95307);

    modifier gasThrottle() {
        if (shouldGasThrottle && Address.isContract(gasprice)) {
            require(tx.gasprice <= IGasPrice(gasprice).maxGasPrice(), "gas is too high!");
        }
        _;
    }
}


// File contracts/BIFI/strategies/Sushi/PhotonStrategySushiConstantProduct.sol



pragma solidity ^0.8.0;








contract PhotonStrategySushiConstantProduct is PhotonStratFeeManager, GasFeeThrottler {
    using SafeERC20 for IERC20;

    struct Routes {
        address[] outputToNative;
        address[] rewardToNative;
        address[] nativeToLp0;
        address[] nativeToLp1;
    }

    struct Pools {
        address[] outputToNative;
        address[] rewardToNative;
        address[] nativeToLp0Pool;
        address[] nativeToLp1Pool;
    }

    struct SwapParams {
        ITridentRouter.ExactInputParams outputToNative;
        ITridentRouter.ExactInputParams rewardToNative;
        ITridentRouter.ExactInputParams nativeToLp0;
        ITridentRouter.ExactInputParams nativeToLp1;
    }

    // Tokens used
    address public native;
    address public output;
    address public reward;
    address public want;
    address public lpToken0;
    address public lpToken1;

    // Third party contracts
    address public chef;
    uint256 public poolId;
    address public bentoBox;

    bool public harvestOnDeposit;
    uint256 public lastHarvest;

    // Routes
    Routes private routes;
    Pools private pools;
    SwapParams private params;

    event StratHarvest(address indexed harvester, uint256 wantHarvested, uint256 tvl);
    event Deposit(uint256 tvl);
    event Withdraw(uint256 tvl);
    event ChargedFees(uint256 callFees, uint256 photonFees, uint256 strategistFees);

    constructor(
        address _want,
        uint256 _poolId,
        address _chef,
        address _bentoBox,
        Routes memory _routes,
        Pools memory _pools,
        CommonAddresses memory _commonAddresses
    ) PhotonStratFeeManager(_commonAddresses) {
        want = _want;
        poolId = _poolId;
        chef = _chef;
        bentoBox = _bentoBox;
        routes = _routes;
        pools = _pools;

        output = _routes.outputToNative[0];
        native = _routes.outputToNative[_routes.outputToNative.length - 1];
        assignParams(_routes.outputToNative, _pools.outputToNative, params.outputToNative);

        require(_routes.rewardToNative[_routes.rewardToNative.length - 1] == native, "rewardToNative[last] != native");
        reward = _routes.rewardToNative[0];
        assignParams(_routes.rewardToNative, _pools.rewardToNative, params.rewardToNative);

        // setup lp routing
        lpToken0 = IBentoPool(want).token0();
        require(_routes.nativeToLp0[0] == native, "nativeToLp0[0] != native");
        require(_routes.nativeToLp0[_routes.nativeToLp0.length - 1] == lpToken0, "nativeToLp0[last] != lpToken0");
        assignParams(_routes.nativeToLp0, _pools.nativeToLp0Pool, params.nativeToLp0);

        lpToken1 = IBentoPool(want).token1();
        require(_routes.nativeToLp1[0] == native, "nativeToLp1[0] != native");
        require(_routes.nativeToLp1[_routes.nativeToLp1.length - 1] == lpToken1, "nativeToLp1[last] != lpToken1");
        assignParams(_routes.nativeToLp1, _pools.nativeToLp1Pool, params.nativeToLp1);

        IBentoBox(bentoBox).setMasterContractApproval(address(this), unirouter, true, 0, bytes32(0), bytes32(0));

        _giveAllowances();
    }

    // puts the funds to work
    function deposit() public whenNotPaused {
        uint256 wantBal = IERC20(want).balanceOf(address(this));

        if (wantBal > 0) {
            IMiniChefV2(chef).deposit(poolId, wantBal, address(this));
            emit Deposit(balanceOf());
        }
    }

    function withdraw(uint256 _amount) external {
        require(msg.sender == vault, "!vault");

        uint256 wantBal = IERC20(want).balanceOf(address(this));

        if (wantBal < _amount) {
            IMiniChefV2(chef).withdraw(poolId, _amount - wantBal, address(this));
            wantBal = IERC20(want).balanceOf(address(this));
        }

        if (wantBal > _amount) {
            wantBal = _amount;
        }

        if (tx.origin != owner() && !paused()) {
            uint256 withdrawalFeeAmount = wantBal * withdrawalFee / WITHDRAWAL_MAX;
            wantBal = wantBal - withdrawalFeeAmount;
        }

        IERC20(want).safeTransfer(vault, wantBal);

        emit Withdraw(balanceOf());
    }

    function beforeDeposit() external override {
        if (harvestOnDeposit) {
            require(msg.sender == vault, "!vault");
            _harvest(tx.origin);
        }
    }

    function harvest() external gasThrottle virtual {
        _harvest(tx.origin);
    }

    function harvest(address callFeeRecipient) external gasThrottle virtual {
        _harvest(callFeeRecipient);
    }

    function managerHarvest() external onlyManager {
        _harvest(tx.origin);
    }

    // compounds earnings and charges performance fee
    function _harvest(address callFeeRecipient) internal whenNotPaused {
        IMiniChefV2(chef).harvest(poolId, address(this));
        uint256 outputBal = IERC20(output).balanceOf(address(this));
        uint256 rewardBal = IERC20(reward).balanceOf(address(this));
        if (outputBal > 0 || rewardBal > 0) {
            chargeFees(callFeeRecipient);
            addLiquidity();
            uint256 wantHarvested = balanceOfWant();
            deposit();

            lastHarvest = block.timestamp;
            emit StratHarvest(msg.sender, wantHarvested, balanceOf());
        }
    }

    // performance fees
    function chargeFees(address callFeeRecipient) internal {
        IPhotonFeeConfig.FeeCategory memory fees = getFees();

        uint256 rewardBal = IERC20(reward).balanceOf(address(this));
        if (rewardBal > 0 && reward != native) {
            ITridentRouter.ExactInputParams memory _rewardToNative = params.rewardToNative;
            _rewardToNative.amountIn = rewardBal;
            ITridentRouter(unirouter).exactInputWithNativeToken(_rewardToNative);
        }

        uint256 outputBal = IERC20(output).balanceOf(address(this));
        if (outputBal > 0) {
            ITridentRouter.ExactInputParams memory _outputToNative = params.outputToNative;
            _outputToNative.amountIn = outputBal;
            ITridentRouter(unirouter).exactInputWithNativeToken(_outputToNative);
        }

        uint256 nativeBal = IERC20(native).balanceOf(address(this)) * fees.total / DIVISOR;

        uint256 callFeeAmount = nativeBal * fees.call / DIVISOR;
        IERC20(native).safeTransfer(callFeeRecipient, callFeeAmount);

        uint256 photonFeeAmount = nativeBal * fees.photon / DIVISOR;
        IERC20(native).safeTransfer(photonFeeRecipient, photonFeeAmount);

        uint256 strategistFeeAmount = nativeBal * fees.strategist / DIVISOR;
        IERC20(native).safeTransfer(strategist, strategistFeeAmount);

        emit ChargedFees(callFeeAmount, photonFeeAmount, strategistFeeAmount);
    }

    // Adds liquidity to AMM and gets more LP tokens.
    function addLiquidity() internal {
        uint256 nativeHalf = IERC20(native).balanceOf(address(this)) / 2;

        if (lpToken0 != native) {
            ITridentRouter.ExactInputParams memory _nativeToLp0 = params.nativeToLp0;
            _nativeToLp0.amountIn = nativeHalf;
            ITridentRouter(unirouter).exactInputWithNativeToken(_nativeToLp0);
        }

        if (lpToken1 != native) {
            ITridentRouter.ExactInputParams memory _nativeToLp1 = params.nativeToLp1;
            _nativeToLp1.amountIn = nativeHalf;
            ITridentRouter(unirouter).exactInputWithNativeToken(_nativeToLp1);
        }

        ITridentRouter.TokenInput[] memory tokens = new ITridentRouter.TokenInput[](2);
        uint256 lp0Bal = IERC20(lpToken0).balanceOf(address(this));
        uint256 lp1Bal = IERC20(lpToken1).balanceOf(address(this));
        tokens[0] = ITridentRouter.TokenInput(lpToken0, true, lp0Bal);
        tokens[1] = ITridentRouter.TokenInput(lpToken1, true, lp1Bal);
        bytes memory data = abi.encode(address(this));

        ITridentRouter(unirouter).addLiquidity(tokens, want, 1, data);
    }

    // calculate the total underlaying 'want' held by the strat.
    function balanceOf() public view returns (uint256) {
        return balanceOfWant() + balanceOfPool();
    }

    // it calculates how much 'want' this contract holds.
    function balanceOfWant() public view returns (uint256) {
        return IERC20(want).balanceOf(address(this));
    }

    // it calculates how much 'want' the strategy has working in the farm.
    function balanceOfPool() public view returns (uint256) {
        (uint256 _amount, ) = IMiniChefV2(chef).userInfo(poolId, address(this));
        return _amount;
    }

    // returns rewards unharvested
    function rewardsAvailable() public view returns (uint256) {
        return IMiniChefV2(chef).pendingSushi(poolId, address(this));
    }

    // native reward amount for calling harvest
    function callReward() external view returns (uint256) {
        uint256 pendingReward;
        address rewarder = IMiniChefV2(chef).rewarder(poolId);
        if (rewarder != address(0)) {
            pendingReward = IRewarder(rewarder).pendingToken(poolId, address(this));
        }

        uint256 outputBal = rewardsAvailable();
        uint256 nativeOut;

        if (reward == native) {
            nativeOut = pendingReward;
        } else if (pendingReward > 0) {
            uint256 poolLength = params.rewardToNative.path.length;
            uint256 amount = pendingReward;
            for (uint i; i < poolLength;) {
                bytes memory data = abi.encode(routes.rewardToNative[i], amount);
                amount = IBentoPool(params.rewardToNative.path[i].pool).getAmountOut(data);
                unchecked { ++i; }
            }
            nativeOut = amount;
        }

        if (outputBal > 0) {
            bytes memory data = abi.encode(output, outputBal);
            nativeOut += IBentoPool(params.outputToNative.path[0].pool).getAmountOut(data);
        }

        IPhotonFeeConfig.FeeCategory memory fees = getFees();
        return nativeOut * fees.total / DIVISOR * fees.call / DIVISOR;
    }

    function setHarvestOnDeposit(bool _harvestOnDeposit) external onlyManager {
        harvestOnDeposit = _harvestOnDeposit;

        if (harvestOnDeposit) {
            setWithdrawalFee(0);
        } else {
            setWithdrawalFee(10);
        }
    }

    function setShouldGasThrottle(bool _shouldGasThrottle) external onlyManager {
        shouldGasThrottle = _shouldGasThrottle;
    }

    // called as part of strat migration. Sends all the available funds back to the vault.
    function retireStrat() external {
        require(msg.sender == vault, "!vault");

        IMiniChefV2(chef).emergencyWithdraw(poolId, address(this));

        uint256 wantBal = IERC20(want).balanceOf(address(this));
        IERC20(want).transfer(vault, wantBal);
    }

    // pauses deposits and withdraws all funds from third party systems.
    function panic() public onlyManager {
        pause();
        IMiniChefV2(chef).emergencyWithdraw(poolId, address(this));
    }

    function pause() public onlyManager {
        _pause();

        _removeAllowances();
    }

    function unpause() external onlyManager {
        _unpause();

        _giveAllowances();

        deposit();
    }

    function _giveAllowances() internal {
        IERC20(want).safeApprove(chef, type(uint).max);
        IERC20(output).safeApprove(bentoBox, type(uint).max);
        IERC20(native).safeApprove(bentoBox, type(uint).max);

        IERC20(lpToken0).safeApprove(bentoBox, 0);
        IERC20(lpToken0).safeApprove(bentoBox, type(uint).max);

        IERC20(lpToken1).safeApprove(bentoBox, 0);
        IERC20(lpToken1).safeApprove(bentoBox, type(uint).max);
    }

    function _removeAllowances() internal {
        IERC20(want).safeApprove(chef, 0);
        IERC20(output).safeApprove(bentoBox, 0);
        IERC20(native).safeApprove(bentoBox, 0);
        IERC20(lpToken0).safeApprove(bentoBox, 0);
        IERC20(lpToken1).safeApprove(bentoBox, 0);
    }

    function outputToNative() external view returns (address[] memory) {
        return routes.outputToNative;
    }

    function rewardToNative() external view returns (address[] memory) {
        return routes.rewardToNative;
    }

    function nativeToLp0() external view returns (address[] memory) {
        return routes.nativeToLp0;
    }

    function nativeToLp1() external view returns (address[] memory) {
        return routes.nativeToLp1;
    }

    function assignParams(address[] memory _route, address[] memory _pools, ITridentRouter.ExactInputParams storage _params) internal {
        uint256 routeLength = _route.length;
        uint256 poolLength = _pools.length;
        if (routeLength == 1) {
            return;
        }
        require (_route.length == poolLength + 1, "mismatch route pool length");
        
        bool unwrapBento;
        address destination;
        for (uint i; i < poolLength;) {
            if (i == poolLength - 1) {
                unwrapBento = true;
                destination = address(this);
            } else {
                destination = _pools[i+1];
            }
            _params.path.push(ITridentRouter.Path(_pools[i], abi.encode(_route[i], destination, unwrapBento)));
            unchecked { ++i; }
        }

        _params.tokenIn = _route[0];
        _params.amountOutMinimum = 1;
    }
}