// File: @openzeppelin/contracts/utils/introspection/IERC165.sol

// OpenZeppelin Contracts v4.4.1 (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);
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

/**
 * @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;
  }
}

// File: @openzeppelin/contracts/utils/Strings.sol

// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
  bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
  uint8 private constant _ADDRESS_LENGTH = 20;

  /**
   * @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);
  }

  /**
   * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
   */
  function toHexString(address addr) internal pure returns (string memory) {
    return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
  }
}

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol

// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
  enum RecoverError {
    NoError,
    InvalidSignature,
    InvalidSignatureLength,
    InvalidSignatureS,
    InvalidSignatureV
  }

  function _throwError(RecoverError error) private pure {
    if (error == RecoverError.NoError) {
      return; // no error: do nothing
    } else if (error == RecoverError.InvalidSignature) {
      revert("ECDSA: invalid signature");
    } else if (error == RecoverError.InvalidSignatureLength) {
      revert("ECDSA: invalid signature length");
    } else if (error == RecoverError.InvalidSignatureS) {
      revert("ECDSA: invalid signature 's' value");
    } else if (error == RecoverError.InvalidSignatureV) {
      revert("ECDSA: invalid signature 'v' value");
    }
  }

  /**
   * @dev Returns the address that signed a hashed message (`hash`) with
   * `signature` or error string. This address can then be used for verification purposes.
   *
   * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
   * this function rejects them by requiring the `s` value to be in the lower
   * half order, and the `v` value to be either 27 or 28.
   *
   * IMPORTANT: `hash` _must_ be the result of a hash operation for the
   * verification to be secure: it is possible to craft signatures that
   * recover to arbitrary addresses for non-hashed data. A safe way to ensure
   * this is by receiving a hash of the original message (which may otherwise
   * be too long), and then calling {toEthSignedMessageHash} on it.
   *
   * Documentation for signature generation:
   * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
   * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
   *
   * _Available since v4.3._
   */
  function tryRecover(bytes32 hash, bytes memory signature)
    internal
    pure
    returns (address, RecoverError)
  {
    if (signature.length == 65) {
      bytes32 r;
      bytes32 s;
      uint8 v;
      // ecrecover takes the signature parameters, and the only way to get them
      // currently is to use assembly.
      /// @solidity memory-safe-assembly
      assembly {
        r := mload(add(signature, 0x20))
        s := mload(add(signature, 0x40))
        v := byte(0, mload(add(signature, 0x60)))
      }
      return tryRecover(hash, v, r, s);
    } else {
      return (address(0), RecoverError.InvalidSignatureLength);
    }
  }

  /**
   * @dev Returns the address that signed a hashed message (`hash`) with
   * `signature`. This address can then be used for verification purposes.
   *
   * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
   * this function rejects them by requiring the `s` value to be in the lower
   * half order, and the `v` value to be either 27 or 28.
   *
   * IMPORTANT: `hash` _must_ be the result of a hash operation for the
   * verification to be secure: it is possible to craft signatures that
   * recover to arbitrary addresses for non-hashed data. A safe way to ensure
   * this is by receiving a hash of the original message (which may otherwise
   * be too long), and then calling {toEthSignedMessageHash} on it.
   */
  function recover(bytes32 hash, bytes memory signature)
    internal
    pure
    returns (address)
  {
    (address recovered, RecoverError error) = tryRecover(hash, signature);
    _throwError(error);
    return recovered;
  }

  /**
   * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
   *
   * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
   *
   * _Available since v4.3._
   */
  function tryRecover(
    bytes32 hash,
    bytes32 r,
    bytes32 vs
  ) internal pure returns (address, RecoverError) {
    bytes32 s = vs &
      bytes32(
        0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
      );
    uint8 v = uint8((uint256(vs) >> 255) + 27);
    return tryRecover(hash, v, r, s);
  }

  /**
   * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
   *
   * _Available since v4.2._
   */
  function recover(
    bytes32 hash,
    bytes32 r,
    bytes32 vs
  ) internal pure returns (address) {
    (address recovered, RecoverError error) = tryRecover(hash, r, vs);
    _throwError(error);
    return recovered;
  }

  /**
   * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
   * `r` and `s` signature fields separately.
   *
   * _Available since v4.3._
   */
  function tryRecover(
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal pure returns (address, RecoverError) {
    // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
    // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
    // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
    // signatures from current libraries generate a unique signature with an s-value in the lower half order.
    //
    // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
    // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
    // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
    // these malleable signatures as well.
    if (
      uint256(s) >
      0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
    ) {
      return (address(0), RecoverError.InvalidSignatureS);
    }
    if (v != 27 && v != 28) {
      return (address(0), RecoverError.InvalidSignatureV);
    }

    // If the signature is valid (and not malleable), return the signer address
    address signer = ecrecover(hash, v, r, s);
    if (signer == address(0)) {
      return (address(0), RecoverError.InvalidSignature);
    }

    return (signer, RecoverError.NoError);
  }

  /**
   * @dev Overload of {ECDSA-recover} that receives the `v`,
   * `r` and `s` signature fields separately.
   */
  function recover(
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal pure returns (address) {
    (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
    _throwError(error);
    return recovered;
  }

  /**
   * @dev Returns an Ethereum Signed Message, created from a `hash`. This
   * produces hash corresponding to the one signed with the
   * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
   * JSON-RPC method as part of EIP-191.
   *
   * See {recover}.
   */
  function toEthSignedMessageHash(bytes32 hash)
    internal
    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));
  }

  /**
   * @dev Returns an Ethereum Signed Message, created from `s`. This
   * produces hash corresponding to the one signed with the
   * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
   * JSON-RPC method as part of EIP-191.
   *
   * See {recover}.
   */
  function toEthSignedMessageHash(bytes memory s)
    internal
    pure
    returns (bytes32)
  {
    return
      keccak256(
        abi.encodePacked(
          "\x19Ethereum Signed Message:\n",
          Strings.toString(s.length),
          s
        )
      );
  }

  /**
   * @dev Returns an Ethereum Signed Typed Data, created from a
   * `domainSeparator` and a `structHash`. This produces hash corresponding
   * to the one signed with the
   * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
   * JSON-RPC method as part of EIP-712.
   *
   * See {recover}.
   */
  function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash)
    internal
    pure
    returns (bytes32)
  {
    return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
  }
}

// File: @openzeppelin/contracts/utils/Context.sol

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
  function _msgSender() internal view virtual returns (address) {
    return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes calldata) {
    return msg.data;
  }
}

// File: @openzeppelin/contracts/access/IAccessControl.sol

// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @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;
}

// File: @openzeppelin/contracts/access/AccessControl.sol

// OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @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);
    _;
  }

  /**
   * @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
    virtual
    override
    returns (bool)
  {
    return _roles[role].members[account];
  }

  /**
   * @dev Revert with a standard message if `_msgSender()` is missing `role`.
   * Overriding this function changes the behavior of the {onlyRole} modifier.
   *
   * Format of the revert message is described in {_checkRole}.
   *
   * _Available since v4.6._
   */
  function _checkRole(bytes32 role) internal view virtual {
    _checkRole(role, _msgSender());
  }

  /**
   * @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 virtual {
    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
    virtual
    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.
   *
   * May emit a {RoleGranted} event.
   */
  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.
   *
   * May emit a {RoleRevoked} event.
   */
  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`.
   *
   * May emit a {RoleRevoked} event.
   */
  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.
   *
   * May emit a {RoleGranted} event.
   *
   * [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.
   *
   * May emit a {RoleGranted} event.
   */
  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.
   *
   * May emit a {RoleRevoked} event.
   */
  function _revokeRole(bytes32 role, address account) internal virtual {
    if (hasRole(role, account)) {
      _roles[role].members[account] = false;
      emit RoleRevoked(role, account, _msgSender());
    }
  }
}

// File: contracts/DecagonTimelock.sol

pragma solidity ^0.8.4;

error NotTokenOwner();
error InvalidSignature();
error NonceAlreadyUsed();
error ExpiredSignature();

contract DecagonTimelock is AccessControl {
  address private signer;
  IERC721 public decagon;

  mapping(uint256 => uint256) private timelocks;
  mapping(string => bool) public usedNonces;

  event TokenLocked(
    uint256 indexed tokenId,
    uint256 indexed numberOfWeeks,
    string nonce
  );
  event SignerUpdated(address indexed newSigner);

  constructor(
    address _signer,
    address _decagon,
    address[] memory admins_
  ) {
    decagon = IERC721(_decagon);
    signer = _signer;

    for (uint256 i = 0; i < admins_.length; i++) {
      _grantRole(DEFAULT_ADMIN_ROLE, admins_[i]);
    }
  }

  modifier onlyTokenOwner(uint256 tokenId) {
    if (decagon.ownerOf(tokenId) != msg.sender) revert NotTokenOwner();
    _;
  }

  function updateSigner(address newSigner)
    external
    onlyRole(DEFAULT_ADMIN_ROLE)
  {
    signer = newSigner;
    emit SignerUpdated(newSigner);
  }

  function removeTimelock(uint256 tokenId)
    external
    onlyRole(DEFAULT_ADMIN_ROLE)
  {
    timelocks[tokenId] = 0;
  }

  function beforeTransferLogic(
    address from,
    address to,
    uint256 tokenId
  ) external view {
    require(!isTimelocked(tokenId), "Decagon: Timelocked token");
  }

  function isTimelocked(uint256 tokenId) public view returns (bool) {
    return block.timestamp < timelocks[tokenId];
  }

  function timelockExpiresAt(uint256 tokenId) external view returns (uint256) {
    return timelocks[tokenId];
  }

  function lockToken(
    uint256 tokenId,
    uint256 numberOfWeeks,
    string memory nonce,
    uint256 expiryBlock,
    bytes memory signature
  ) external onlyTokenOwner(tokenId) {
    if (usedNonces[nonce]) revert NonceAlreadyUsed();

    if (block.number > expiryBlock) revert ExpiredSignature();

    if (
      !verify(
        keccak256(
          abi.encodePacked(
            msg.sender,
            tokenId,
            numberOfWeeks,
            nonce,
            expiryBlock,
            address(this)
          )
        ),
        signature
      )
    ) revert InvalidSignature();

    usedNonces[nonce] = true;
    uint256 expires = block.timestamp + (1 weeks * numberOfWeeks);
    timelocks[tokenId] = expires;

    emit TokenLocked(tokenId, numberOfWeeks, nonce);
  }

  function verify(bytes32 messageHash, bytes memory signature)
    internal
    view
    returns (bool)
  {
    return
      signer ==
      ECDSA.recover(ECDSA.toEthSignedMessageHash(messageHash), signature);
  }
}

interface IERC721 {
  function ownerOf(uint256 tokenId) external view returns (address);
}