// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)



/**
 * @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;
    }
}

// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)



/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)



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

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

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

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








// OpenZeppelin Contracts v4.4.0 (token/ERC20/utils/SafeERC20.sol)





// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)



/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

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


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

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

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

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

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

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

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// OpenZeppelin Contracts v4.4.0 (access/AccessControl.sol)




// OpenZeppelin Contracts v4.4.0 (access/IAccessControl.sol)



/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}




// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)





/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}


/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}


// OpenZeppelin Contracts v4.4.0 (security/Pausable.sol)





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

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

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





contract ECDSAOffsetRecovery {
    function getHashPacked(
        address user,
        uint256 amountWithFee,
        bytes32 originalTxHash,
        uint256 blockchainNum
    ) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(user, amountWithFee, originalTxHash, blockchainNum));
    }

    function toEthSignedMessageHash(bytes32 hash)
        public
        pure
        returns (bytes32)
    {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return
            keccak256(
                abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)
            );
    }

    function ecOffsetRecover(
        bytes32 hash,
        bytes memory signature,
        uint256 offset
    ) public pure returns (address) {
        bytes32 r;
        bytes32 s;
        uint8 v;

        // Divide the signature in r, s and v variables with inline assembly.
        assembly {
            r := mload(add(signature, add(offset, 0x20)))
            s := mload(add(signature, add(offset, 0x40)))
            v := byte(0, mload(add(signature, add(offset, 0x60))))
        }

        // Version of signature should be 27 or 28, but 0 and 1 are also possible versions
        if (v < 27) {
            v += 27;
        }

        // If the version is correct return the signer address
        if (v != 27 && v != 28) {
            return (address(0));
        }

        // bytes memory prefix = "\x19Ethereum Signed Message:\n32";
        // hash = keccak256(abi.encodePacked(prefix, hash));
        // solium-disable-next-line arg-overflow
        return ecrecover(toEthSignedMessageHash(hash), v, r, s);
    }
}




/// @title Contains 512-bit math functions
/// @notice Facilitates multiplication and division that can have overflow of an intermediate value without any loss of precision
/// @dev Handles "phantom overflow" i.e., allows multiplication and division where an intermediate value overflows 256 bits
library FullMath {
    /// @notice Calculates floor(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    /// @param a The multiplicand
    /// @param b The multiplier
    /// @param denominator The divisor
    /// @return result The 256-bit result
    /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv
    function mulDiv(
        uint256 a,
        uint256 b,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        // 512-bit multiply [prod1 prod0] = a * b
        // Compute the product mod 2**256 and mod 2**256 - 1
        // then use the Chinese Remainder Theorem to reconstruct
        // the 512 bit result. The result is stored in two 256
        // variables such that product = prod1 * 2**256 + prod0
        uint256 prod0; // Least significant 256 bits of the product
        uint256 prod1; // Most significant 256 bits of the product
        assembly {
            let mm := mulmod(a, b, not(0))
            prod0 := mul(a, b)
            prod1 := sub(sub(mm, prod0), lt(mm, prod0))
        }

        // Handle non-overflow cases, 256 by 256 division
        if (prod1 == 0) {
            require(denominator > 0);
            assembly {
                result := div(prod0, denominator)
            }
            return result;
        }

        // Make sure the result is less than 2**256.
        // Also prevents denominator == 0
        require(denominator > prod1);

        ///////////////////////////////////////////////
        // 512 by 256 division.
        ///////////////////////////////////////////////

        // Make division exact by subtracting the remainder from [prod1 prod0]
        // Compute remainder using mulmod
        uint256 remainder;
        assembly {
            remainder := mulmod(a, b, denominator)
        }
        // Subtract 256 bit number from 512 bit number
        assembly {
            prod1 := sub(prod1, gt(remainder, prod0))
            prod0 := sub(prod0, remainder)
        }

        // Factor powers of two out of denominator
        // Compute largest power of two divisor of denominator.
        // Always >= 1.
        uint256 twos = (type(uint256).max - denominator + 1) & denominator;
        // Divide denominator by power of two
        assembly {
            denominator := div(denominator, twos)
        }

        // Divide [prod1 prod0] by the factors of two
        assembly {
            prod0 := div(prod0, twos)
        }
        // Shift in bits from prod1 into prod0. For this we need
        // to flip `twos` such that it is 2**256 / twos.
        // If twos is zero, then it becomes one
        assembly {
            twos := add(div(sub(0, twos), twos), 1)
        }
        prod0 |= prod1 * twos;

        // Invert denominator mod 2**256
        // Now that denominator is an odd number, it has an inverse
        // modulo 2**256 such that denominator * inv = 1 mod 2**256.
        // Compute the inverse by starting with a seed that is correct
        // correct for four bits. That is, denominator * inv = 1 mod 2**4
        uint256 inv = (3 * denominator) ^ 2;
        // Now use Newton-Raphson iteration to improve the precision.
        // Thanks to Hensel's lifting lemma, this also works in modular
        // arithmetic, doubling the correct bits in each step.
        inv *= 2 - denominator * inv; // inverse mod 2**8
        inv *= 2 - denominator * inv; // inverse mod 2**16
        inv *= 2 - denominator * inv; // inverse mod 2**32
        inv *= 2 - denominator * inv; // inverse mod 2**64
        inv *= 2 - denominator * inv; // inverse mod 2**128
        inv *= 2 - denominator * inv; // inverse mod 2**256

        // Because the division is now exact we can divide by multiplying
        // with the modular inverse of denominator. This will give us the
        // correct result modulo 2**256. Since the precoditions guarantee
        // that the outcome is less than 2**256, this is the final result.
        // We don't need to compute the high bits of the result and prod1
        // is no longer required.
        result = prod0 * inv;
        return result;
    }
}


abstract contract Storage is AccessControl, Pausable, ECDSAOffsetRecovery{
    bytes32 public constant OWNER_ROLE = keccak256("OWNER_ROLE");
    bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE");
    bytes32 public constant RELAYER_ROLE = keccak256("RELAYER_ROLE");
    bytes32 public constant VALIDATOR_ROLE = keccak256("VALIDATOR_ROLE");

    uint128 public numOfThisBlockchain;
    address public blockchainRouter;
    mapping(uint256 => bytes32) public RubicAddresses;
    mapping(uint256 => bool) public existingOtherBlockchain;
    mapping(uint256 => uint256) public feeAmountOfBlockchain;
    mapping(uint256 => uint256) public blockchainCryptoFee;

    uint256 public constant SIGNATURE_LENGTH = 65;

    mapping(bytes32 => uint256) public processedTransactions;
    uint256 public minConfirmationSignatures = 3;

    uint256 public minTokenAmount;
    uint256 public maxTokenAmount;
    uint256 public maxGasPrice;
    uint256 public minConfirmationBlocks;
    uint256 public refundSlippage;

    uint256 public accTokenFee = 1;
}

abstract contract MainBase is Storage{
    using Address for address payable;
    using SafeERC20 for IERC20;

    bytes32 internal constant IMPLEMENTATION_MAPPING_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;


    struct Implementation{
        address router;
        address _address;
    }

    /**
     * @dev throws if transaction sender is not in owner role
     */
    modifier onlyOwner() {
        require(
            hasRole(OWNER_ROLE, _msgSender()),
            "Caller is not in owner role"
        );
        _;
    }

    /**
     * @dev throws if transaction sender is not in owner or manager role
     */
    modifier onlyOwnerAndManager() {
        require(
            hasRole(OWNER_ROLE, _msgSender()) ||
                hasRole(MANAGER_ROLE, _msgSender()),
            "Caller is not in owner or manager role"
        );
        _;
    }

    /**
     * @dev throws if transaction sender is not in relayer role
     */
    modifier onlyRelayer() {
        require(
            hasRole(RELAYER_ROLE, _msgSender()),
            "swapContract: Caller is not in relayer role"
        );
        _;
    }

    modifier onlyOwnerAndManagerAndRelayer(){
        require(
            hasRole(OWNER_ROLE, _msgSender()) ||
            hasRole(MANAGER_ROLE, _msgSender()) ||
            hasRole(RELAYER_ROLE, _msgSender()),
            "swapContract: not ownr mngr rlyr"
        );
        _;
    }

    function getOtherBlockchainAvailableByNum(uint256 blockchain)
        external
        view
        returns (bool)
    {
        return existingOtherBlockchain[blockchain];
    }

    /**
     * @dev Registers another blockchain for availability to swap
     * @param numOfOtherBlockchain number of blockchain
     */
    function addOtherBlockchain(uint128 numOfOtherBlockchain)
        external
        onlyOwner
    {
        require(
            numOfOtherBlockchain != numOfThisBlockchain,
            "swapContract: Cannot add this blockchain to array of other blockchains"
        );
        require(
            !existingOtherBlockchain[numOfOtherBlockchain],
            "swapContract: This blockchain is already added"
        );
        existingOtherBlockchain[numOfOtherBlockchain] = true;
    }

    /**
     * @dev Unregisters another blockchain for availability to swap
     * @param numOfOtherBlockchain number of blockchain
     */
    function removeOtherBlockchain(uint128 numOfOtherBlockchain)
        external
        onlyOwner
    {
        require(
            existingOtherBlockchain[numOfOtherBlockchain],
            "swapContract: This blockchain was not added"
        );
        existingOtherBlockchain[numOfOtherBlockchain] = false;
    }

    /**
     * @dev Change existing blockchain id
     * @param oldNumOfOtherBlockchain number of existing blockchain
     * @param newNumOfOtherBlockchain number of new blockchain
     */
    function changeOtherBlockchain(
        uint128 oldNumOfOtherBlockchain,
        uint128 newNumOfOtherBlockchain
    ) external onlyOwner {
        require(
            oldNumOfOtherBlockchain != newNumOfOtherBlockchain,
            "swapContract: Cannot change blockchains with same number"
        );
        require(
            newNumOfOtherBlockchain != numOfThisBlockchain,
            "swapContract: Cannot add this blockchain to array of other blockchains"
        );
        require(
            existingOtherBlockchain[oldNumOfOtherBlockchain],
            "swapContract: This blockchain was not added"
        );
        require(
            !existingOtherBlockchain[newNumOfOtherBlockchain],
            "swapContract: This blockchain is already added"
        );

        existingOtherBlockchain[oldNumOfOtherBlockchain] = false;
        existingOtherBlockchain[newNumOfOtherBlockchain] = true;
    }

    // FEE MANAGEMENT

    /**
     * @dev Sends collected crypto fee to the owner
     */
    function collectCryptoFee(address toAddress) external onlyOwner {
        require(isRelayer(toAddress), 'swapContract: fee can be sent only to a relayer');
        payable(toAddress).sendValue(address(this).balance);
    }

    /**
     * @dev Sends collected token fee to the owner
     */
    function collectTokenFee() external onlyOwner {
        IERC20 _Rubic = IERC20(address(uint160(uint256(RubicAddresses[numOfThisBlockchain]))));
        _Rubic.safeTransfer(
            msg.sender,
            accTokenFee - 1
        );
        accTokenFee = 1; //GAS savings
    }

    /**
     * @dev Changes fee values for blockchains in feeAmountOfBlockchain variables
     * @notice fee is represented as hundredths of a bip, i.e. 1e-6
     * @param _blockchainNum Existing number of blockchain
     * @param feeAmount Fee amount to substruct from transfer amount
     */
    function setFeeAmountOfBlockchain(uint128 _blockchainNum, uint256 feeAmount)
        external
        onlyOwnerAndManager
    {
        feeAmountOfBlockchain[_blockchainNum] = feeAmount;
    }

    /**
     * @dev Changes crypto fee values for blockchains in blockchainCryptoFee variables
     * @param _blockchainNum Existing number of blockchain
     * @param feeAmount Fee amount that must be sent calling transferToOtherBlockchain
     */
    function setCryptoFeeOfBlockchain(uint128 _blockchainNum, uint256 feeAmount)
        external
        onlyOwnerAndManagerAndRelayer
    {
        blockchainCryptoFee[_blockchainNum] = feeAmount;
    }

    /**
     * @dev Changes the address of Rubic in the certain blockchain
     * @param _blockchainNum Existing number of blockchain
     * @param _RubicAddress The Rubic address
     */
    function setRubicAddressOfBlockchain(
        uint128 _blockchainNum,
        bytes32 _RubicAddress
    ) external onlyOwnerAndManager {
        RubicAddresses[_blockchainNum] = _RubicAddress;
    }

    /**
     * @dev Approves tokens to a swap Router. We can approve the most popular tokens before any swaps
     * To spare users from paying for it
     * @param _token The token address to approve
     */
    function approveTokenToRouter(IERC20 _token, address _router) external onlyOwnerAndManager{
        _token.approve(_router, type(uint256).max);
    }

    /**
     * @dev With this function owner, which is a multisig account, can withdraw some RBC from the pool
     * @param amount The amount to withdraw
     */
    function poolBalancing(uint256 amount) external onlyOwner{
        IERC20(address(uint160(uint256(RubicAddresses[numOfThisBlockchain])))).transfer(msg.sender, amount);
    }

    // VALIDATOR CONFIRMATIONS MANAGEMENT

    /**
     * @dev Changes requirement for minimal amount of signatures to validate on transfer
     * @param _minConfirmationSignatures Number of signatures to verify
     */
    function setMinConfirmationSignatures(uint256 _minConfirmationSignatures)
        external
        onlyOwner
    {
        require(
            _minConfirmationSignatures > 0,
            "swapContract: At least 1 confirmation can be set"
        );
        minConfirmationSignatures = _minConfirmationSignatures;
    }

    /**
     * @dev Changes requirement for minimal token amount on transfers
     * @param _minTokenAmount Amount of tokens
     */
    function setMinTokenAmount(uint256 _minTokenAmount)
        external
        onlyOwnerAndManager
    {
        minTokenAmount = _minTokenAmount;
    }

    /**
     * @dev Changes requirement for maximum token amount on transfers
     * @param _maxTokenAmount Amount of tokens
     */
    function setMaxTokenAmount(uint256 _maxTokenAmount)
        external
        onlyOwnerAndManager
    {
        maxTokenAmount = _maxTokenAmount;
    }

    /**
     * @dev Changes parameter of maximum gas price on which relayer nodes will operate
     * @param _maxGasPrice Price of gas in wei
     */
    function setMaxGasPrice(uint256 _maxGasPrice) external onlyOwnerAndManager {
        require(_maxGasPrice > 0, "swapContract: Gas price cannot be zero");
        maxGasPrice = _maxGasPrice;
    }

    /**
     * @dev Changes requirement for minimal amount of block to consider tx confirmed on validator
     * @param _minConfirmationBlocks Amount of blocks
     */

    function setMinConfirmationBlocks(uint256 _minConfirmationBlocks)
        external
        onlyOwnerAndManager
    {
        minConfirmationBlocks = _minConfirmationBlocks;
    }

    function setRefundSlippage(uint256 _refundSlippage)
        external
        onlyOwnerAndManager
    {
        refundSlippage = _refundSlippage;
    }

    /**
     * @dev Transfers permissions of contract ownership.
     * Will setup new owner and one manager on contract.
     * Main purpose of this function is to transfer ownership from deployer account ot real owner
     * @param newOwner Address of new owner
     * @param newManager Address of new manager
     */
    function transferOwnerAndSetManager(address newOwner, address newManager)
        external
        onlyOwner
    {
        require(
            newOwner != _msgSender(),
            "swapContract: New owner must be different than current"
        );
        require(
            newOwner != address(0x0),
            "swapContract: Owner cannot be zero address"
        );
        require(
            newManager != address(0x0),
            "swapContract: Owner cannot be zero address"
        );
        _setupRole(DEFAULT_ADMIN_ROLE, newOwner);
        _setupRole(OWNER_ROLE, newOwner);
        _setupRole(MANAGER_ROLE, newManager);
        renounceRole(OWNER_ROLE, _msgSender());
        renounceRole(DEFAULT_ADMIN_ROLE, _msgSender());
    }

    /**
     * @dev Pauses transfers of tokens on contract
     */
    function pauseExecution() external onlyOwner {
        _pause();
    }

    /**
     * @dev Resumes transfers of tokens on contract
     */
    function continueExecution() external onlyOwner {
        _unpause();
    }

    /**
     * @dev Function to check if address is belongs to owner role
     * @param account Address to check
     */
    function isOwner(address account) public view returns (bool) {
        return hasRole(OWNER_ROLE, account);
    }

    /**
     * @dev Function to check if address is belongs to manager role
     * @param account Address to check
     */
    function isManager(address account) public view returns (bool) {
        return hasRole(MANAGER_ROLE, account);
    }

    /**
     * @dev Function to check if address is belongs to relayer role
     * @param account Address to check
     */
    function isRelayer(address account) public view returns (bool) {
        return hasRole(RELAYER_ROLE, account);
    }

    /**
     * @dev Function to check if address is belongs to validator role
     * @param account Address to check
     *
     */
    function isValidator(address account) public view returns (bool) {
        return hasRole(VALIDATOR_ROLE, account);
    }

    /**
     * @dev Function changes values associated with certain originalTxHash
     * @param originalTxHash Transaction hash to change
     * @param statusCode Associated status: 0-Not processed, 1-Processed, 2-Reverted
     */
    function changeTxStatus(
        bytes32 originalTxHash,
        uint256 statusCode
    ) external onlyRelayer {
        require(
            statusCode != 0,
            "swapContract: you cannot set the statusCode to 0"
        );
        require(
            processedTransactions[originalTxHash] != 1,
            "swapContract: transaction with this originalTxHash has already been set as succeed"
        );
        processedTransactions[originalTxHash] = statusCode;
    }

    /**
     * @dev Plain fallback function to receive crypto
     */
    receive() external payable {}
}

contract MainContract is MainBase{
    constructor(
        uint128 _numOfThisBlockchain,
        uint128[] memory _numsOfOtherBlockchains,
        uint256[] memory tokenLimits,
        uint256 _maxGasPrice,
        uint256 _minConfirmationBlocks,
        uint256 _refundSlippage,
        bytes32[] memory _RubicAddresses
    ) {
        for (uint256 i = 0; i < _numsOfOtherBlockchains.length; i++) {
            require(
                _numsOfOtherBlockchains[i] != _numOfThisBlockchain,
                "swapContract: Number of this blockchain is in array of other blockchains"
            );
            existingOtherBlockchain[_numsOfOtherBlockchains[i]] = true;
        }

        for (uint256 i = 0; i < _RubicAddresses.length; i++) {
            RubicAddresses[i + 1] = _RubicAddresses[i];
        }

        require(_maxGasPrice > 0, "swapContract: Gas price cannot be zero");

        numOfThisBlockchain = _numOfThisBlockchain;
        minTokenAmount = tokenLimits[0];
        maxTokenAmount = tokenLimits[1];
        maxGasPrice = _maxGasPrice;
        refundSlippage = _refundSlippage;
        minConfirmationBlocks = _minConfirmationBlocks;
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
        _setupRole(OWNER_ROLE, _msgSender());
    }

    function getStorageValue(bytes4 sig, bytes32 slot) internal view returns (Implementation storage impl) {
        assembly {
            // Store num in memory scratch space (note: lookup "free memory pointer" if you need to allocate space)
            mstore(0, sig)
            // Store slot number in scratch space after num
            mstore(32, slot)
            // Create hash from previously stored num and slot
            let hash := keccak256(0, 64)
            // Load mapping value using the just calculated hash
            impl.slot := hash
        }
    }

    function getInfoAboutSig(bytes4 sig, bytes32 slot) external view returns(
        address implementationAddress,
        address router
    ){
        Implementation storage impl;
        assembly {
            // Store num in memory scratch space (note: lookup "free memory pointer" if you need to allocate space)
            mstore(0, sig)
            // Store slot number in scratch space after num
            mstore(32, slot)
            // Create hash from previously stored num and slot
            let hash := keccak256(0, 64)
            // Load mapping value using the just calculated hash
            impl.slot := hash
        }
        implementationAddress = impl._address;
        router = impl.router;
    }

    function addInstance(
        bytes4 sig,
        address _address,
        address _router
    ) external onlyOwner{
        Implementation storage impl = getStorageValue(sig, IMPLEMENTATION_MAPPING_SLOT);
        impl._address = _address;
        impl.router = _router;
        IERC20(address(uint160(uint256(RubicAddresses[numOfThisBlockchain])))).approve(
            _router,
            type(uint256).max
        );
    }

    function setRouter(bytes4 sig, address _router) external onlyOwnerAndManager{
        require(_router != address(0), 'router cannot be zero');
        Implementation storage impl = getStorageValue(sig, IMPLEMENTATION_MAPPING_SLOT);
        impl.router = _router;
        IERC20(address(uint160(uint256(RubicAddresses[numOfThisBlockchain])))).approve(
            _router,
            type(uint256).max
        );
    }

    fallback() external payable{
        Implementation storage impl = getStorageValue(msg.sig, IMPLEMENTATION_MAPPING_SLOT);
        address implementation = impl._address;
        blockchainRouter = impl.router;
        require(blockchainRouter != address(0), 'no instanceaAbb');
        assembly{
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
}

{
  "compilationTarget": {
    "MainContract.sol": "MainContract"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 310
  },
  "remappings": []
}