/**
 *Submitted for verification at Etherscan.io on 2022-03-15
*/

// SPDX-License-Identifier: GPL-3.0-or-later
// Sources flattened with hardhat v2.6.1 https://hardhat.org

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

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

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

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


// File @openzeppelin/contracts-upgradeable/token/ERC20/extensions/[email protected]

// 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 IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @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/contracts-upgradeable/utils/[email protected]

// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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 Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File @openzeppelin/contracts-upgradeable/proxy/utils/[email protected]

// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}


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

// 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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}


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

// OpenZeppelin Contracts (last updated v4.5.0) (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 ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    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.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _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, _allowances[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 = _allowances[owner][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * 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 Spend `amount` form the allowance of `owner` toward `spender`.
     *
     * 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 {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}


// File libraries/ScaledMath.sol

pragma solidity 0.8.9;

/*
 * @dev To use functions of this contract, at least one of the numbers must
 * be scaled to `DECIMAL_SCALE`. The result will scaled to `DECIMAL_SCALE`
 * if both numbers are scaled to `DECIMAL_SCALE`, otherwise to the scale
 * of the number not scaled by `DECIMAL_SCALE`
 */
library ScaledMath {
    // solhint-disable-next-line private-vars-leading-underscore
    uint256 internal constant DECIMAL_SCALE = 1e18;
    // solhint-disable-next-line private-vars-leading-underscore
    uint256 internal constant ONE = 1e18;

    /**
     * @notice Performs a multiplication between two scaled numbers
     */
    function scaledMul(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a * b) / DECIMAL_SCALE;
    }

    /**
     * @notice Performs a division between two scaled numbers
     */
    function scaledDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a * DECIMAL_SCALE) / b;
    }

    /**
     * @notice Performs a division between two numbers, rounding up the result
     */
    function scaledDivRoundUp(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a * DECIMAL_SCALE + b - 1) / b;
    }

    /**
     * @notice Performs a division between two numbers, ignoring any scaling and rounding up the result
     */
    function divRoundUp(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a + b - 1) / b;
    }
}


// File interfaces/ILpToken.sol

pragma solidity 0.8.9;

interface ILpToken is IERC20Upgradeable {
    function mint(address account, uint256 lpTokens) external;

    function burn(address account, uint256 burnAmount) external returns (uint256);

    function burn(uint256 burnAmount) external;

    function minter() external view returns (address);

    function initialize(
        string memory name_,
        string memory symbol_,
        uint8 _decimals,
        address _minter
    ) external returns (bool);
}


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

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `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);

    /**
     * @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 interfaces/IPreparable.sol

pragma solidity 0.8.9;

interface IPreparable {
    event ConfigPreparedAddress(bytes32 indexed key, address value, uint256 delay);
    event ConfigPreparedNumber(bytes32 indexed key, uint256 value, uint256 delay);

    event ConfigUpdatedAddress(bytes32 indexed key, address oldValue, address newValue);
    event ConfigUpdatedNumber(bytes32 indexed key, uint256 oldValue, uint256 newValue);

    event ConfigReset(bytes32 indexed key);
}


// File interfaces/IStrategy.sol

pragma solidity 0.8.9;

interface IStrategy {
    function name() external view returns (string memory);

    function deposit() external payable returns (bool);

    function balance() external view returns (uint256);

    function withdraw(uint256 amount) external returns (bool);

    function withdrawAll() external returns (uint256);

    function harvestable() external view returns (uint256);

    function harvest() external returns (uint256);

    function strategist() external view returns (address);

    function shutdown() external returns (bool);

    function hasPendingFunds() external view returns (bool);
}


// File interfaces/IVault.sol

pragma solidity 0.8.9;


/**
 * @title Interface for a Vault
 */

interface IVault is IPreparable {
    event StrategyActivated(address indexed strategy);

    event StrategyDeactivated(address indexed strategy);

    /**
     * @dev 'netProfit' is the profit after all fees have been deducted
     */
    event Harvest(uint256 indexed netProfit, uint256 indexed loss);

    function initialize(
        address _pool,
        uint256 _debtLimit,
        uint256 _targetAllocation,
        uint256 _bound
    ) external;

    function withdrawFromStrategyWaitingForRemoval(address strategy) external returns (uint256);

    function deposit() external payable;

    function withdraw(uint256 amount) external returns (bool);

    function initializeStrategy(address strategy_) external returns (bool);

    function withdrawAll() external;

    function withdrawFromReserve(uint256 amount) external;

    function getStrategy() external view returns (IStrategy);

    function getStrategiesWaitingForRemoval() external view returns (address[] memory);

    function getAllocatedToStrategyWaitingForRemoval(address strategy)
        external
        view
        returns (uint256);

    function getTotalUnderlying() external view returns (uint256);

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


// File interfaces/pool/ILiquidityPool.sol

pragma solidity 0.8.9;


interface ILiquidityPool is IPreparable {
    event Deposit(address indexed minter, uint256 depositAmount, uint256 mintedLpTokens);

    event DepositFor(
        address indexed minter,
        address indexed mintee,
        uint256 depositAmount,
        uint256 mintedLpTokens
    );

    event Redeem(address indexed redeemer, uint256 redeemAmount, uint256 redeemTokens);

    event LpTokenSet(address indexed lpToken);

    event StakerVaultSet(address indexed stakerVault);

    function redeem(uint256 redeemTokens) external returns (uint256);

    function redeem(uint256 redeemTokens, uint256 minRedeemAmount) external returns (uint256);

    function calcRedeem(address account, uint256 underlyingAmount) external returns (uint256);

    function deposit(uint256 mintAmount) external payable returns (uint256);

    function deposit(uint256 mintAmount, uint256 minTokenAmount) external payable returns (uint256);

    function depositAndStake(uint256 depositAmount, uint256 minTokenAmount)
        external
        payable
        returns (uint256);

    function depositFor(address account, uint256 depositAmount) external payable returns (uint256);

    function depositFor(
        address account,
        uint256 depositAmount,
        uint256 minTokenAmount
    ) external payable returns (uint256);

    function unstakeAndRedeem(uint256 redeemLpTokens, uint256 minRedeemAmount)
        external
        returns (uint256);

    function handleLpTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) external;

    function executeNewVault() external returns (address);

    function executeNewMaxWithdrawalFee() external returns (uint256);

    function executeNewRequiredReserves() external returns (uint256);

    function executeNewReserveDeviation() external returns (uint256);

    function setLpToken(address _lpToken) external returns (bool);

    function setStaker() external returns (bool);

    function isCapped() external returns (bool);

    function uncap() external returns (bool);

    function updateDepositCap(uint256 _depositCap) external returns (bool);

    function getUnderlying() external view returns (address);

    function getLpToken() external view returns (address);

    function getWithdrawalFee(address account, uint256 amount) external view returns (uint256);

    function getVault() external view returns (IVault);

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


// File libraries/Errors.sol

pragma solidity 0.8.9;

// solhint-disable private-vars-leading-underscore

library Error {
    string internal constant ADDRESS_WHITELISTED = "address already whitelisted";
    string internal constant ADMIN_ALREADY_SET = "admin has already been set once";
    string internal constant ADDRESS_NOT_WHITELISTED = "address not whitelisted";
    string internal constant ADDRESS_NOT_FOUND = "address not found";
    string internal constant CONTRACT_INITIALIZED = "contract can only be initialized once";
    string internal constant CONTRACT_PAUSED = "contract is paused";
    string internal constant INVALID_AMOUNT = "invalid amount";
    string internal constant INVALID_INDEX = "invalid index";
    string internal constant INVALID_VALUE = "invalid msg.value";
    string internal constant INVALID_SENDER = "invalid msg.sender";
    string internal constant INVALID_TOKEN = "token address does not match pool's LP token address";
    string internal constant INVALID_DECIMALS = "incorrect number of decimals";
    string internal constant INVALID_ARGUMENT = "invalid argument";
    string internal constant INVALID_PARAMETER_VALUE = "invalid parameter value attempted";
    string internal constant INVALID_IMPLEMENTATION = "invalid pool implementation for given coin";
    string internal constant INVALID_POOL_IMPLEMENTATION =
        "invalid pool implementation for given coin";
    string internal constant INVALID_LP_TOKEN_IMPLEMENTATION =
        "invalid LP Token implementation for given coin";
    string internal constant INVALID_VAULT_IMPLEMENTATION =
        "invalid vault implementation for given coin";
    string internal constant INVALID_STAKER_VAULT_IMPLEMENTATION =
        "invalid stakerVault implementation for given coin";
    string internal constant INSUFFICIENT_BALANCE = "insufficient balance";
    string internal constant ADDRESS_ALREADY_SET = "Address is already set";
    string internal constant INSUFFICIENT_STRATEGY_BALANCE = "insufficient strategy balance";
    string internal constant INSUFFICIENT_FUNDS_RECEIVED = "insufficient funds received";
    string internal constant ADDRESS_DOES_NOT_EXIST = "address does not exist";
    string internal constant ADDRESS_FROZEN = "address is frozen";
    string internal constant ROLE_EXISTS = "role already exists";
    string internal constant CANNOT_REVOKE_ROLE = "cannot revoke role";
    string internal constant UNAUTHORIZED_ACCESS = "unauthorized access";
    string internal constant SAME_ADDRESS_NOT_ALLOWED = "same address not allowed";
    string internal constant SELF_TRANSFER_NOT_ALLOWED = "self-transfer not allowed";
    string internal constant ZERO_ADDRESS_NOT_ALLOWED = "zero address not allowed";
    string internal constant ZERO_TRANSFER_NOT_ALLOWED = "zero transfer not allowed";
    string internal constant THRESHOLD_TOO_HIGH = "threshold is too high, must be under 10";
    string internal constant INSUFFICIENT_THRESHOLD = "insufficient threshold";
    string internal constant NO_POSITION_EXISTS = "no position exists";
    string internal constant POSITION_ALREADY_EXISTS = "position already exists";
    string internal constant PROTOCOL_NOT_FOUND = "protocol not found";
    string internal constant TOP_UP_FAILED = "top up failed";
    string internal constant SWAP_PATH_NOT_FOUND = "swap path not found";
    string internal constant UNDERLYING_NOT_SUPPORTED = "underlying token not supported";
    string internal constant NOT_ENOUGH_FUNDS_WITHDRAWN =
        "not enough funds were withdrawn from the pool";
    string internal constant FAILED_TRANSFER = "transfer failed";
    string internal constant FAILED_MINT = "mint failed";
    string internal constant FAILED_REPAY_BORROW = "repay borrow failed";
    string internal constant FAILED_METHOD_CALL = "method call failed";
    string internal constant NOTHING_TO_CLAIM = "there is no claimable balance";
    string internal constant ERC20_BALANCE_EXCEEDED = "ERC20: transfer amount exceeds balance";
    string internal constant INVALID_MINTER =
        "the minter address of the LP token and the pool address do not match";
    string internal constant STAKER_VAULT_EXISTS = "a staker vault already exists for the token";
    string internal constant DEADLINE_NOT_ZERO = "deadline must be 0";
    string internal constant DEADLINE_NOT_SET = "deadline is 0";
    string internal constant DEADLINE_NOT_REACHED = "deadline has not been reached yet";
    string internal constant DELAY_TOO_SHORT = "delay be at least 3 days";
    string internal constant INSUFFICIENT_UPDATE_BALANCE =
        "insufficient funds for updating the position";
    string internal constant SAME_AS_CURRENT = "value must be different to existing value";
    string internal constant NOT_CAPPED = "the pool is not currently capped";
    string internal constant ALREADY_CAPPED = "the pool is already capped";
    string internal constant EXCEEDS_DEPOSIT_CAP = "deposit exceeds deposit cap";
    string internal constant VALUE_TOO_LOW_FOR_GAS = "value too low to cover gas";
    string internal constant NOT_ENOUGH_FUNDS = "not enough funds to withdraw";
    string internal constant ESTIMATED_GAS_TOO_HIGH = "too much ETH will be used for gas";
    string internal constant DEPOSIT_FAILED = "deposit failed";
    string internal constant GAS_TOO_HIGH = "too much ETH used for gas";
    string internal constant GAS_BANK_BALANCE_TOO_LOW = "not enough ETH in gas bank to cover gas";
    string internal constant INVALID_TOKEN_TO_ADD = "Invalid token to add";
    string internal constant INVALID_TOKEN_TO_REMOVE = "token can not be removed";
    string internal constant TIME_DELAY_NOT_EXPIRED = "time delay not expired yet";
    string internal constant UNDERLYING_NOT_WITHDRAWABLE =
        "pool does not support additional underlying coins to be withdrawn";
    string internal constant STRATEGY_SHUT_DOWN = "Strategy is shut down";
    string internal constant STRATEGY_DOES_NOT_EXIST = "Strategy does not exist";
    string internal constant UNSUPPORTED_UNDERLYING = "Underlying not supported";
    string internal constant NO_DEX_SET = "no dex has been set for token";
    string internal constant INVALID_TOKEN_PAIR = "invalid token pair";
    string internal constant TOKEN_NOT_USABLE = "token not usable for the specific action";
    string internal constant ADDRESS_NOT_ACTION = "address is not registered action";
    string internal constant INVALID_SLIPPAGE_TOLERANCE = "Invalid slippage tolerance";
    string internal constant POOL_NOT_PAUSED = "Pool must be paused to withdraw from reserve";
    string internal constant INTERACTION_LIMIT = "Max of one deposit and withdraw per block";
    string internal constant GAUGE_EXISTS = "Gauge already exists";
    string internal constant GAUGE_DOES_NOT_EXIST = "Gauge does not exist";
    string internal constant EXCEEDS_MAX_BOOST = "Not allowed to exceed maximum boost on Convex";
    string internal constant PREPARED_WITHDRAWAL =
        "Cannot relock funds when withdrawal is being prepared";
    string internal constant ASSET_NOT_SUPPORTED = "Asset not supported";
    string internal constant STALE_PRICE = "Price is stale";
    string internal constant NEGATIVE_PRICE = "Price is negative";
    string internal constant NOT_ENOUGH_BKD_STAKED = "Not enough BKD tokens staked";
    string internal constant RESERVE_ACCESS_EXCEEDED = "Reserve access exceeded";
}


// File contracts/LpToken.sol

pragma solidity 0.8.9;





contract LpToken is ILpToken, ERC20Upgradeable {
    using ScaledMath for uint256;

    uint8 private _decimals;

    address public override minter;

    /**
     * @notice Make a function only callable by the minter contract.
     * @dev Fails if msg.sender is not the minter.
     */
    modifier onlyMinter() {
        require(msg.sender == minter, Error.UNAUTHORIZED_ACCESS);
        _;
    }

    constructor() ERC20Upgradeable() {}

    function initialize(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        address _minter
    ) external override initializer returns (bool) {
        require(_minter != address(0), Error.ZERO_ADDRESS_NOT_ALLOWED);
        __ERC20_init(name_, symbol_);
        _decimals = decimals_;
        minter = _minter;
        return true;
    }

    /**
     * @notice Mint tokens.
     * @param account Account from which tokens should be burned.
     * @param amount Amount of tokens to mint.
     */
    function mint(address account, uint256 amount) external override onlyMinter {
        _mint(account, amount);
    }

    /**
     * @notice Burns tokens of msg.sender.
     * @param amount Amount of tokens to burn.
     */
    function burn(uint256 amount) external override {
        _burn(msg.sender, amount);
    }

    /**
     * @notice Burn tokens.
     * @param owner Account from which tokens should be burned.
     * @param burnAmount Amount of tokens to burn.
     * @return Aamount of tokens burned.
     */
    function burn(address owner, uint256 burnAmount)
        external
        override
        onlyMinter
        returns (uint256)
    {
        _burn(owner, burnAmount);
        return burnAmount;
    }

    function decimals() public view virtual override returns (uint8) {
        return _decimals;
    }

    /**
     * @dev We notify that LP tokens have been transfered
     * this is currently used to keep track of the withdrawal fees
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual override {
        if (amount > 0) ILiquidityPool(minter).handleLpTokenTransfer(from, to, amount); // add check to not break 0 transfers
    }
}

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