Contract 0x442d629dd3028edf4efcc2aafff00f9d7d1a7470

/**
 *Submitted for verification at snowtrace.io on 2022-11-17
*/

// SPDX-License-Identifier: GPL-3.0
// Sources flattened with hardhat v2.12.2 https://hardhat.org
// File @openzeppelin/contracts/access/[email protected]
// 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/[email protected]
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable is IAccessControl {
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}
// File @openzeppelin/contracts/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 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/utils/[email protected]
// 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/introspection/[email protected]
// 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/[email protected]
// 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/access/[email protected]
// 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 @openzeppelin/contracts/utils/structs/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}
// File @openzeppelin/contracts/access/[email protected]
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;

    mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

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

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**
     * @dev Overload {_grantRole} to track enumerable memberships
     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**
     * @dev Overload {_revokeRole} to track enumerable memberships
     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }
}
// File contracts/Supervised.sol
pragma solidity ^0.8.0;

abstract contract Supervised is AccessControlEnumerable {
    constructor() {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}

abstract contract XPowerSupervised is Supervised {
    /** role grants right to change treasury's share per mint */
    bytes32 public constant TREASURY_SHARE_ROLE = keccak256("TREASURY_SHARE_ROLE");
    bytes32 public constant TREASURY_SHARE_ADMIN_ROLE = keccak256("TREASURY_SHARE_ADMIN_ROLE");
    /** role grants right to change mining-difficulty parametrization */
    bytes32 public constant MINING_DIFFICULTY_ROLE = keccak256("MINING_DIFFICULTY_ROLE");
    bytes32 public constant MINING_DIFFICULTY_ADMIN_ROLE = keccak256("MINING_DIFFICULTY_ADMIN_ROLE");

    constructor() {
        _setRoleAdmin(TREASURY_SHARE_ROLE, TREASURY_SHARE_ADMIN_ROLE);
        _grantRole(TREASURY_SHARE_ADMIN_ROLE, msg.sender);
        _setRoleAdmin(MINING_DIFFICULTY_ROLE, MINING_DIFFICULTY_ADMIN_ROLE);
        _grantRole(MINING_DIFFICULTY_ADMIN_ROLE, msg.sender);
    }
}

abstract contract MoeTreasurySupervised is Supervised {
    /** role grants right to change APR parametrization */
    bytes32 public constant APR_ROLE = keccak256("APR_ROLE");
    bytes32 public constant APR_ADMIN_ROLE = keccak256("APR_ADMIN_ROLE");
    /** role grants right to change APR bonus parametrization */
    bytes32 public constant APR_BONUS_ROLE = keccak256("APR_BONUS_ROLE");
    bytes32 public constant APR_BONUS_ADMIN_ROLE = keccak256("APR_BONUS_ADMIN_ROLE");

    constructor() {
        _setRoleAdmin(APR_ROLE, APR_ADMIN_ROLE);
        _grantRole(APR_ADMIN_ROLE, msg.sender);
        _setRoleAdmin(APR_BONUS_ROLE, APR_BONUS_ADMIN_ROLE);
        _grantRole(APR_BONUS_ADMIN_ROLE, msg.sender);
    }
}

abstract contract MoeMigratableSupervised is Supervised {
    /** role grants right to seal MOE migration */
    bytes32 public constant MOE_SEAL_ROLE = keccak256("MOE_SEAL_ROLE");
    bytes32 public constant MOE_SEAL_ADMIN_ROLE = keccak256("MOE_SEAL_ADMIN_ROLE");

    constructor() {
        _setRoleAdmin(MOE_SEAL_ROLE, MOE_SEAL_ADMIN_ROLE);
        _grantRole(MOE_SEAL_ADMIN_ROLE, msg.sender);
    }
}

abstract contract SovMigratableSupervised is Supervised {
    /** role grants right to seal SOV migration */
    bytes32 public constant SOV_SEAL_ROLE = keccak256("SOV_SEAL_ROLE");
    bytes32 public constant SOV_SEAL_ADMIN_ROLE = keccak256("SOV_SEAL_ADMIN_ROLE");

    constructor() {
        _setRoleAdmin(SOV_SEAL_ROLE, SOV_SEAL_ADMIN_ROLE);
        _grantRole(SOV_SEAL_ADMIN_ROLE, msg.sender);
    }
}

abstract contract NftMigratableSupervised is Supervised {
    /** role grants right to seal NFT migration */
    bytes32 public constant NFT_SEAL_ROLE = keccak256("NFT_SEAL_ROLE");
    bytes32 public constant NFT_SEAL_ADMIN_ROLE = keccak256("NFT_SEAL_ADMIN_ROLE");

    constructor() {
        _setRoleAdmin(NFT_SEAL_ROLE, NFT_SEAL_ADMIN_ROLE);
        _grantRole(NFT_SEAL_ADMIN_ROLE, msg.sender);
    }
}

abstract contract URIMalleableSupervised is Supervised {
    /** role grants right to change metadata URIs */
    bytes32 public constant URI_DATA_ROLE = keccak256("URI_DATA_ROLE");
    bytes32 public constant URI_DATA_ADMIN_ROLE = keccak256("URI_DATA_ADMIN_ROLE");

    constructor() {
        _setRoleAdmin(URI_DATA_ROLE, URI_DATA_ADMIN_ROLE);
        _grantRole(URI_DATA_ADMIN_ROLE, msg.sender);
    }
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}
// File @openzeppelin/contracts/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 IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

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

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

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

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

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

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

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

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}
// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;
/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}
// File contracts/Migratable.sol
// solhint-disable not-rely-on-time
pragma solidity ^0.8.0;

/**
 * Allows migration of tokens from an old contract upto a certain deadline.
 * Further, it is possible to close down the migration window earlier than
 * the specified deadline.
 */
abstract contract Migratable is ERC20, ERC20Burnable, Supervised {
    /** old contract to migrate from */
    ERC20Burnable private _token;
    /** timestamp of migration deadline */
    uint256 private _deadlineBy;
    /** flag to control migration */
    bool private _migratable = true;
    /** number of migrated tokens */
    uint256 private _migratedTotal = 0;

    /** @param base address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address base, uint256 deadlineIn) {
        _deadlineBy = block.timestamp + deadlineIn;
        _token = ERC20Burnable(base);
    }

    /** import amount from old contract */
    function migrate(uint256 oldAmount) public virtual {
        uint256 newAmount = _premigrate(oldAmount);
        _mint(msg.sender, newAmount);
    }

    /** preimport amount from old contract w/o minting new tokens */
    function _premigrate(uint256 oldAmount) internal returns (uint256) {
        require(_migratable, "migration sealed");
        uint256 timestamp = block.timestamp;
        require(_deadlineBy >= timestamp, "deadline passed");
        uint256 myAllowance = _token.allowance(msg.sender, address(this));
        require(oldAmount <= myAllowance, "insufficient allowance");
        uint256 oldBalance = _token.balanceOf(msg.sender);
        require(oldAmount <= oldBalance, "insufficient balance");
        _token.burnFrom(msg.sender, oldAmount);
        uint256 newBalance = _token.balanceOf(msg.sender);
        require(newBalance + oldAmount == oldBalance, "invalid balance");
        require(decimals() >= _token.decimals(), "invalid decimals");
        uint8 deltaExponent = decimals() - _token.decimals();
        uint256 newAmount = oldAmount * 10 ** deltaExponent;
        _incrementCounter(newAmount);
        return newAmount;
    }

    /** @return number of migrated tokens */
    function migrated() public view returns (uint256) {
        return _migratedTotal;
    }

    /** seal migration (manually) */
    function seal() public virtual onlyRole(0x0) {
        _migratable = false;
    }

    /** track migration counter */
    function _incrementCounter(uint256 amount) internal {
        _migratedTotal += amount;
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return
            interfaceId == type(IERC20).interfaceId ||
            interfaceId == type(IERC20Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }
}

/**
 * Allows migration of MOE tokens from an old contract upto a certain deadline.
 */
abstract contract MoeMigratable is Migratable, MoeMigratableSupervised {
    /** seal migration (manually) */
    function seal() public override onlyRole(MOE_SEAL_ROLE) {
        super.seal();
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(bytes4 interfaceId) public view virtual override(Migratable, Supervised) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}

/**
 * Allows migration of SOV tokens from an old contract upto a certain deadline.
 */
abstract contract SovMigratable is Migratable, SovMigratableSupervised {
    /** proof-of-work tokens */
    ERC20 private _moe;

    /** @param moe address of MOE tokens */
    /** @param base address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moe, address base, uint256 deadlineIn) Migratable(base, deadlineIn) {
        _moe = ERC20(moe);
    }

    /** import amount from old contract */
    function migrate(uint256 oldAmount) public override {
        uint256 newAmount = _premigrate(oldAmount);
        _moe.transferFrom(msg.sender, (address)(this), oldAmount);
        _mint(msg.sender, newAmount);
    }

    /** seal migration (manually) */
    function seal() public override onlyRole(SOV_SEAL_ROLE) {
        super.seal();
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(bytes4 interfaceId) public view virtual override(Migratable, Supervised) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}
// File @openzeppelin/contracts/access/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// File contracts/XPower.sol
// solhint-disable not-rely-on-time
// solhint-disable no-empty-blocks
pragma solidity ^0.8.0;


/**
 * Abstract base class for the XPower THOR, LOKI and ODIN proof-of-work tokens.
 * It verifies, that the nonce & the block-hash do result in a positive amount,
 * (as specified by the sub-classes). After the verification, the corresponding
 * amount of tokens are minted for the beneficiary (plus the treasury).
 */
abstract contract XPower is ERC20, ERC20Burnable, MoeMigratable, XPowerSupervised, Ownable {
    using EnumerableSet for EnumerableSet.UintSet;
    /** set of nonce-hashes already minted for */
    EnumerableSet.UintSet private _hashes;
    /** map from block-hashes to timestamps */
    mapping(bytes32 => uint256) internal _timestamps;
    /** anchor for difficulty calculation */
    uint256 private immutable _timestamp;
    /** parametrization of treasury-share */
    uint256[] private _share = [0, 0, 2, 1, 0, 0];
    /** parametrization of mining-difficulty */
    uint256[] private _rigor = [0, 0, 4, 1, 0, 0];

    /** @param symbol short token symbol */
    /** @param moeBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(
        string memory symbol,
        address moeBase,
        uint256 deadlineIn
    )
        // ERC20 constructor: name, symbol
        ERC20("XPower", symbol)
        // Migratable: old contract, rel. deadline [seconds]
        Migratable(moeBase, deadlineIn)
    {
        _timestamp = 0x6215621e; // 2022-02-22T22:22:22Z
    }

    /** emitted on caching most recent block-hash */
    event Init(bytes32 blockHash, uint256 timestamp);

    /** cache most recent block-hash */
    function init() public {
        bytes32 blockHash = blockhash(block.number - 1);
        require(blockHash > 0, "invalid block-hash");
        uint256 timestamp = block.timestamp;
        require(timestamp > 0, "invalid timestamp");
        _timestamps[blockHash] = timestamp;
        emit Init(blockHash, timestamp);
    }

    /** mint tokens for beneficiary, interval, block-hash and nonce */
    function mint(address to, bytes32 blockHash, uint256 nonce) public {
        // get current interval (in hours)
        uint256 interval = _interval();
        // check block-hash to be recent
        _requireRecent(blockHash, interval);
        // calculate nonce-hash for to, interval, block-hash & nonce
        bytes32 nonceHash = _hashOf(to, interval, blockHash, nonce);
        require(!_hashes.contains(uint256(nonceHash)), "duplicate nonce-hash");
        // calculate amount of tokens for nonce-hash
        uint256 amount = _amountOf(nonceHash);
        require(amount > 0, "empty nonce-hash");
        // ensure unique nonce-hash (to be used once)
        _hashes.add(uint256(nonceHash));
        // mint tokens for owner (i.e. project treasury)
        uint256 treasure = treasuryShare(amount);
        if (treasure > 0) _mint(owner(), treasure);
        // mint tokens for beneficiary (e.g. nonce provider)
        _mint(to, amount);
    }

    /** @return treasury-share for given amount */
    function treasuryShare(uint256 amount) public view returns (uint256) {
        return ((amount + _share[5] - _share[4]) * _share[3]) / _share[2] + _share[1] - _share[0];
    }

    /** @return treasury-share parameters */
    function getTreasuryShare() public view returns (uint256[] memory) {
        return _share;
    }

    /** set treasury-share parameters */
    function setTreasuryShare(uint256[] memory array) public onlyRole(TREASURY_SHARE_ROLE) {
        require(array.length == 6, "invalid array.length");
        _share = array;
    }

    /** @return mining-difficulty for given timestamp */
    function miningDifficulty(uint256 timestamp) public view returns (uint256) {
        uint256 dt = timestamp - _timestamp;
        return (100 * (dt + _rigor[5] - _rigor[4]) * _rigor[3]) / (_rigor[2] * 365_25 days) + _rigor[1] - _rigor[0];
    }

    /** @return mining-difficulty parameters */
    function getMiningDifficulty() public view returns (uint256[] memory) {
        return _rigor;
    }

    /** set mining-difficulty parameters */
    function setMiningDifficulty(uint256[] memory array) public onlyRole(MINING_DIFFICULTY_ROLE) {
        require(array.length == 6, "invalid array.length");
        _rigor = array;
    }

    /** check whether block-hash has recently been cached or is recent */
    function _requireRecent(bytes32 blockHash, uint256 interval) internal view {
        require(blockHash > 0, "invalid block-hash");
        uint256 timestamp = _timestamps[blockHash];
        if (timestamp / (1 hours) != interval) {
            for (uint256 i = 1; i <= 256; i++) {
                if (block.number >= i && blockhash(block.number - i) == blockHash) {
                    return; // block-hash is within the last 256 blocks
                }
            }
            revert("expired block-hash");
        }
    }

    /** @return current interval (in hours) */
    function _interval() internal view returns (uint256) {
        uint256 interval = block.timestamp / (1 hours);
        require(interval > 0, "invalid interval");
        return interval;
    }

    /** @return hash of beneficiary, interval, block-hash & nonce */
    function _hashOf(
        address to,
        uint256 interval,
        bytes32 blockHash,
        uint256 nonce
    ) internal view virtual returns (bytes32) {
        return keccak256(abi.encode(symbol(), to, interval, blockHash, nonce));
    }

    /** @return amount for provided nonce-hash */
    function _amountOf(bytes32 nonceHash) internal view virtual returns (uint256);

    /** @return leading zeros of provided nonce-hash */
    function _zerosOf(bytes32 nonceHash) internal pure returns (uint8) {
        uint8 counter = 0;
        for (uint8 i = 0; i < 32; i++) {
            bytes1 b = nonceHash[i];
            if (b == 0x00) {
                counter += 2;
                continue;
            }
            if (
                b == 0x01 ||
                b == 0x02 ||
                b == 0x03 ||
                b == 0x04 ||
                b == 0x05 ||
                b == 0x06 ||
                b == 0x07 ||
                b == 0x08 ||
                b == 0x09 ||
                b == 0x0a ||
                b == 0x0b ||
                b == 0x0c ||
                b == 0x0d ||
                b == 0x0e ||
                b == 0x0f
            ) {
                counter += 1;
                break;
            }
            break;
        }
        return counter;
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override(MoeMigratable, Supervised) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}

/**
 * Allow mining & minting for THOR proof-of-work tokens, where the rewarded
 * amount equals to *only* |leading-zeros(nonce-hash) - difficulty|.
 */
contract XPowerThor is XPower {
    /** @param moeBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moeBase, uint256 deadlineIn) XPower("THOR", moeBase, deadlineIn) {}

    /** @return amount for provided nonce-hash */
    function _amountOf(bytes32 nonceHash) internal view override returns (uint256) {
        uint256 difficulty = miningDifficulty(block.timestamp);
        uint256 zeros = _zerosOf(nonceHash);
        if (zeros > difficulty) {
            return (zeros - difficulty) * 10 ** decimals();
        }
        return 0;
    }
}

/**
 * Allow mining & minting for LOKI proof-of-work tokens, where the rewarded
 * amount equals to 2 ^ |leading-zeros(nonce-hash) - difficulty| - 1.
 */
contract XPowerLoki is XPower {
    /** @param moeBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moeBase, uint256 deadlineIn) XPower("LOKI", moeBase, deadlineIn) {}

    /** @return amount for provided nonce-hash */
    function _amountOf(bytes32 nonceHash) internal view override returns (uint256) {
        uint256 difficulty = miningDifficulty(block.timestamp);
        uint256 zeros = _zerosOf(nonceHash);
        if (zeros > difficulty) {
            return (2 ** (zeros - difficulty) - 1) * 10 ** decimals();
        }
        return 0;
    }
}

/**
 * Allow mining & minting for ODIN proof-of-work tokens, where the rewarded
 * amount equals to 16 ^ |leading-zeros(nonce-hash) - difficulty| - 1.
 */
contract XPowerOdin is XPower {
    /** @param moeBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moeBase, uint256 deadlineIn) XPower("ODIN", moeBase, deadlineIn) {}

    /** @return amount for provided nonce-hash */
    function _amountOf(bytes32 nonceHash) internal view override returns (uint256) {
        uint256 difficulty = miningDifficulty(block.timestamp);
        uint256 zeros = _zerosOf(nonceHash);
        if (zeros > difficulty) {
            return (16 ** (zeros - difficulty) - 1) * 10 ** decimals();
        }
        return 0;
    }
}
// File contracts/APower.sol
// solhint-disable no-empty-blocks
pragma solidity ^0.8.0;


/**
 * Abstract base class for the APower aTHOR, aLOKI and aODIN tokens, where only
 * the owner of the contract i.e the MoeTreasury is entitled to mint them.
 */
abstract contract APower is ERC20, ERC20Burnable, SovMigratable, Ownable {
    /** (burnable) proof-of-work tokens */
    XPower private _moe;

    /** @param symbol short token symbol */
    /** @param moeLink address of XPower tokens */
    /** @param sovBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(
        string memory symbol,
        address moeLink,
        address sovBase,
        uint256 deadlineIn
    )
        // ERC20 constructor: name, symbol
        ERC20("APower", symbol)
        // Migratable: XPower, old APower & rel. deadline [seconds]
        SovMigratable(moeLink, sovBase, deadlineIn)
    {
        _moe = XPower(moeLink);
    }

    /** mint amount of tokens for beneficiary (after wrapping XPower) */
    function mint(address to, uint256 amount) public onlyOwner {
        _moe.transferFrom(owner(), (address)(this), amount);
        _mint(to, amount);
    }

    /** burn amount of tokens from caller (and then unwrap XPower) */
    function burn(uint256 amount) public override {
        super.burn(amount);
        _moe.transfer(msg.sender, amount);
    }

    /**
     * burn amount of tokens from account, deducting from the caller's
     * allowance (and then unwrap XPower)
     */
    function burnFrom(address account, uint256 amount) public override {
        super.burnFrom(account, amount);
        _moe.transfer(account, amount);
    }
}

contract APowerThor is APower {
    /** @param moeLink address of XPower tokens */
    /** @param sovBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moeLink, address sovBase, uint256 deadlineIn) APower("aTHOR", moeLink, sovBase, deadlineIn) {}
}

contract APowerLoki is APower {
    /** @param moeLink address of XPower tokens */
    /** @param sovBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moeLink, address sovBase, uint256 deadlineIn) APower("aLOKI", moeLink, sovBase, deadlineIn) {}
}

contract APowerOdin is APower {
    /** @param moeLink address of XPower tokens */
    /** @param sovBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address moeLink, address sovBase, uint256 deadlineIn) APower("aODIN", moeLink, sovBase, deadlineIn) {}
}
// File @openzeppelin/contracts/utils/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// File @openzeppelin/contracts/token/ERC1155/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}
// File @openzeppelin/contracts/token/ERC1155/[email protected]
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}
// File @openzeppelin/contracts/token/ERC1155/extensions/[email protected]
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/extensions/IERC1155MetadataURI.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURI is IERC1155 {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}
// File @openzeppelin/contracts/token/ERC1155/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/ERC1155.sol)

pragma solidity ^0.8.0;


/**
 * @dev Implementation of the basic standard multi-token.
 * See https://eips.ethereum.org/EIPS/eip-1155
 * Originally based on code by Enjin: https://github.com/enjin/erc-1155
 *
 * _Available since v3.1._
 */
contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
    using Address for address;

    // Mapping from token ID to account balances
    mapping(uint256 => mapping(address => uint256)) private _balances;

    // Mapping from account to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
    string private _uri;

    /**
     * @dev See {_setURI}.
     */
    constructor(string memory uri_) {
        _setURI(uri_);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC1155).interfaceId ||
            interfaceId == type(IERC1155MetadataURI).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC1155MetadataURI-uri}.
     *
     * This implementation returns the same URI for *all* token types. It relies
     * on the token type ID substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * Clients calling this function must replace the `\{id\}` substring with the
     * actual token type ID.
     */
    function uri(uint256) public view virtual override returns (string memory) {
        return _uri;
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: address zero is not a valid owner");
        return _balances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
        public
        view
        virtual
        override
        returns (uint256[] memory)
    {
        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[account][operator];
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not token owner nor approved"
        );
        _safeTransferFrom(from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not token owner nor approved"
        );
        _safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }
        _balances[id][to] += amount;

        emit TransferSingle(operator, from, to, id, amount);

        _afterTokenTransfer(operator, from, to, ids, amounts, data);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
            _balances[id][to] += amount;
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _afterTokenTransfer(operator, from, to, ids, amounts, data);

        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    /**
     * @dev Sets a new URI for all token types, by relying on the token type ID
     * substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * By this mechanism, any occurrence of the `\{id\}` substring in either the
     * URI or any of the amounts in the JSON file at said URI will be replaced by
     * clients with the token type ID.
     *
     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
     * interpreted by clients as
     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
     * for token type ID 0x4cce0.
     *
     * See {uri}.
     *
     * Because these URIs cannot be meaningfully represented by the {URI} event,
     * this function emits no events.
     */
    function _setURI(string memory newuri) internal virtual {
        _uri = newuri;
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        _balances[id][to] += amount;
        emit TransferSingle(operator, address(0), to, id, amount);

        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);

        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _mintBatch(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] += amounts[i];
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);

        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `from`
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `from` must have at least `amount` tokens of token type `id`.
     */
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }

        emit TransferSingle(operator, from, address(0), id, amount);

        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
        }

        emit TransferBatch(operator, from, address(0), ids, amounts);

        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC1155: setting approval status for self");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `ids` and `amounts` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155Receiver.onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                bytes4 response
            ) {
                if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}
// File @openzeppelin/contracts/token/ERC1155/extensions/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/extensions/ERC1155Burnable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Extension of {ERC1155} that allows token holders to destroy both their
 * own tokens and those that they have been approved to use.
 *
 * _Available since v3.1._
 */
abstract contract ERC1155Burnable is ERC1155 {
    function burn(
        address account,
        uint256 id,
        uint256 value
    ) public virtual {
        require(
            account == _msgSender() || isApprovedForAll(account, _msgSender()),
            "ERC1155: caller is not token owner nor approved"
        );

        _burn(account, id, value);
    }

    function burnBatch(
        address account,
        uint256[] memory ids,
        uint256[] memory values
    ) public virtual {
        require(
            account == _msgSender() || isApprovedForAll(account, _msgSender()),
            "ERC1155: caller is not token owner nor approved"
        );

        _burnBatch(account, ids, values);
    }
}
// File contracts/NftMigratable.sol
// solhint-disable not-rely-on-time
pragma solidity ^0.8.0;

/**
 * Allows migration of NFTs from an old contract; batch migration is also
 * possible. Further, manually sealing the migration is possible too.
 */
abstract contract NftMigratable is ERC1155, ERC1155Burnable, NftMigratableSupervised {
    /** old contract to migrate from */
    ERC1155Burnable private _token;
    /** timestamp of migration deadline */
    uint256 private _deadlineBy;
    /** flag to control migration */
    bool private _migratable = true;

    /** @param base address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(address base, uint256 deadlineIn) {
        _deadlineBy = block.timestamp + deadlineIn;
        _token = ERC1155Burnable(base);
    }

    /** import NFT from old contract */
    function migrate(uint256 nftId, uint256 amount) public {
        require(_migratable, "migration sealed");
        uint256 timestamp = block.timestamp;
        require(_deadlineBy >= timestamp, "deadline passed");
        _token.burn(msg.sender, nftId, amount);
        require(amount > 0, "non-positive amount");
        _mint(msg.sender, nftId, amount, "");
    }

    /** batch import NFTs from old contract */
    function migrateBatch(uint256[] memory nftIds, uint256[] memory amounts) public {
        require(_migratable, "migration sealed");
        uint256 timestamp = block.timestamp;
        require(_deadlineBy >= timestamp, "deadline passed");
        _token.burnBatch(msg.sender, nftIds, amounts);
        for (uint256 i = 0; i < amounts.length; i++) {
            require(amounts[i] > 0, "non-positive amount");
        }
        _mintBatch(msg.sender, nftIds, amounts, "");
    }

    /** seal migration (manually) */
    function seal() public onlyRole(NFT_SEAL_ROLE) {
        _migratable = false;
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC1155, Supervised) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}
// File contracts/URIMalleable.sol
pragma solidity ^0.8.0;
/**
 * Allows changing of the NFT's URI (by the URI_DATA_ROLE), where the URI
 * should e.g. redirect permanently (301) to a corresponding IPFS address.
 */
abstract contract URIMalleable is ERC1155, URIMalleableSupervised {
    /** set a new URI for all token types */
    function setURI(string memory newuri) public onlyRole(URI_DATA_ROLE) {
        _setURI(newuri);
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC1155, Supervised) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}
// File @openzeppelin/contracts/token/ERC1155/extensions/[email protected]
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC1155/extensions/ERC1155Supply.sol)

pragma solidity ^0.8.0;

/**
 * @dev Extension of ERC1155 that adds tracking of total supply per id.
 *
 * Useful for scenarios where Fungible and Non-fungible tokens have to be
 * clearly identified. Note: While a totalSupply of 1 might mean the
 * corresponding is an NFT, there is no guarantees that no other token with the
 * same id are not going to be minted.
 */
abstract contract ERC1155Supply is ERC1155 {
    mapping(uint256 => uint256) private _totalSupply;

    /**
     * @dev Total amount of tokens in with a given id.
     */
    function totalSupply(uint256 id) public view virtual returns (uint256) {
        return _totalSupply[id];
    }

    /**
     * @dev Indicates whether any token exist with a given id, or not.
     */
    function exists(uint256 id) public view virtual returns (bool) {
        return ERC1155Supply.totalSupply(id) > 0;
    }

    /**
     * @dev See {ERC1155-_beforeTokenTransfer}.
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual override {
        super._beforeTokenTransfer(operator, from, to, ids, amounts, data);

        if (from == address(0)) {
            for (uint256 i = 0; i < ids.length; ++i) {
                _totalSupply[ids[i]] += amounts[i];
            }
        }

        if (to == address(0)) {
            for (uint256 i = 0; i < ids.length; ++i) {
                uint256 id = ids[i];
                uint256 amount = amounts[i];
                uint256 supply = _totalSupply[id];
                require(supply >= amount, "ERC1155: burn amount exceeds totalSupply");
                unchecked {
                    _totalSupply[id] = supply - amount;
                }
            }
        }
    }
}
// File contracts/XPowerNftBase.sol
// solhint-disable not-rely-on-time
// solhint-disable no-empty-blocks
pragma solidity ^0.8.0;

/**
 * Abstract base NFT class: publicly *not* minteable (nor burneable).
 */
abstract contract XPowerNftBase is ERC1155, ERC1155Burnable, ERC1155Supply, URIMalleable, NftMigratable, Ownable {
    /** contract name */
    string public name;
    /** contract symbol */
    string public symbol;

    /** NFT levels: UNIT, ..., YOTTA *or* higher! */
    uint256 public constant UNIT = 0;
    uint256 public constant KILO = 3;
    uint256 public constant MEGA = 6;
    uint256 public constant GIGA = 9;
    uint256 public constant TERA = 12;
    uint256 public constant PETA = 15;
    uint256 public constant EXA = 18;
    uint256 public constant ZETTA = 21;
    uint256 public constant YOTTA = 24;

    /** @param nftBase address of old contract */
    /** @param uri meta-data URI */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(
        string memory nftName,
        string memory nftSymbol,
        string memory nftUri,
        address nftBase,
        uint256 deadlineIn
    )
        // ERC1155 constructor: meta-data URI
        ERC1155(nftUri)
        // MigratableNft: old contract, rel. deadline [seconds]
        NftMigratable(nftBase, deadlineIn)
    {
        name = nftName;
        symbol = nftSymbol;
    }

    /** @return nft-id composed of (year, level) */
    function idBy(uint256 anno, uint256 level) public pure returns (uint256) {
        require(level % 3 == 0, "non-ternary level");
        require(level < 100, "invalid level");
        require(anno > 1970, "invalid year");
        return anno * 100 + level;
    }

    /** @return nft-ids composed of [(year, level) for level in levels] */
    function idsBy(uint256 anno, uint256[] memory levels) public pure returns (uint256[] memory) {
        uint256[] memory ids = new uint256[](levels.length);
        for (uint256 i = 0; i < levels.length; i++) {
            ids[i] = idBy(anno, levels[i]);
        }
        return ids;
    }

    /** @return denomination of level (1, 1'000, 1'000'000, ...) */
    function denominationOf(uint256 level) public pure returns (uint256) {
        require(level % 3 == 0, "non-ternary level");
        require(level < 100, "invalid level");
        return 10 ** level;
    }

    /** @return level of nft-id (0, 3, 6, ...) */
    function levelOf(uint256 nftId) public pure returns (uint256) {
        uint256 level = nftId % 100;
        require(level % 3 == 0, "non-ternary level");
        require(level < 100, "invalid level");
        return level;
    }

    /** @return year of nft-id (2021, 2022, ...) */
    function yearOf(uint256 nftId) public pure returns (uint256) {
        uint256 anno = nftId / 100;
        require(anno > 1970, "invalid year");
        return anno;
    }

    /** @return current number of years since anno domini */
    function year() public view returns (uint256) {
        uint256 anno = 1970 + (100 * block.timestamp) / (365_25 days);
        require(anno > 1970, "invalid year");
        return anno;
    }

    /** called before any token transfer; includes (batched) minting and burning */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory nftIds,
        uint256[] memory amounts,
        bytes memory data
    ) internal override(ERC1155, ERC1155Supply) {
        ERC1155Supply._beforeTokenTransfer(operator, from, to, nftIds, amounts, data);
    }

    /** returns true if this contract implements the interface defined by interfaceId */
    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override(ERC1155, URIMalleable, NftMigratable) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}
// File contracts/XPowerNftStaked.sol
// solhint-disable no-empty-blocks
// solhint-disable not-rely-on-time
pragma solidity ^0.8.0;

/**
 * Abstract base class for staked XPowerNft(s): Contract owner only is allowed
 * to mint and burn XPowerNftStaked tokens.
 */
abstract contract XPowerNftStaked is XPowerNftBase {
    /** map of mints: account => nft-id => accumulator [seconds] */
    mapping(address => mapping(uint256 => uint256)) private _mints;
    /** map of burns: account => nft-id => accumulator [seconds] */
    mapping(address => mapping(uint256 => uint256)) private _burns;
    /** map of total mints: nft-id => accumulator [seconds] */
    mapping(uint256 => uint256) private _mintsTotal;
    /** map of total burns: nft-id => accumulator [seconds] */
    mapping(uint256 => uint256) private _burnsTotal;

    /** @param pptName NFT name */
    /** @param pptSymbol NFT symbol */
    /** @param pptUri meta-data URI */
    /** @param pptBase address of old contract */
    /** @param deadlineIn seconds to end-of-migration */
    constructor(
        string memory pptName,
        string memory pptSymbol,
        string memory pptUri,
        address pptBase,
        uint256 deadlineIn
    ) XPowerNftBase(pptName, pptSymbol, pptUri, pptBase, deadlineIn) {}

    /** transfer tokens (and reset age) */
    function safeTransferFrom(
        address from,
        address to,
        uint256 nftId,
        uint256 amount,
        bytes memory data
    ) public override {
        _pushBurn(from, nftId, amount);
        _pushMint(to, nftId, amount);
        super.safeTransferFrom(from, to, nftId, amount, data);
    }

    /** batch transfer tokens (and reset age) */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory nftIds,
        uint256[] memory amounts,
        bytes memory data
    ) public override {
        _pushBurnBatch(from, nftIds, amounts);
        _pushMintBatch(to, nftIds, amounts);
        super.safeBatchTransferFrom(from, to, nftIds, amounts, data);
    }

    /** mint particular amount of staked NFTs for given address and nft-id */
    function mint(address to, uint256 nftId, uint256 amount) public onlyOwner {
        _pushMint(to, nftId, amount);
        _mint(to, nftId, amount, "");
    }

    /** mint particular amounts of staked NFTs for given address and nft-ids */
    function mintBatch(address to, uint256[] memory nftIds, uint256[] memory amounts) public onlyOwner {
        _pushMintBatch(to, nftIds, amounts);
        _mintBatch(to, nftIds, amounts, "");
    }

    /** burn particular amount of staked NFTs for given address and nft-id */
    function burn(address from, uint256 nftId, uint256 amount) public override onlyOwner {
        _pushBurn(from, nftId, amount);
        _burn(from, nftId, amount);
    }

    /** burn particular amounts of staked NFTs for given address and nft-ids */
    function burnBatch(address from, uint256[] memory nftIds, uint256[] memory amounts) public override onlyOwner {
        _pushBurnBatch(from, nftIds, amounts);
        _burnBatch(from, nftIds, amounts);
    }

    /** @return age seconds over all stakes for given address and nft-id */
    function ageOf(address account, uint256 nftId) public view returns (uint256) {
        uint256 mints = _mints[account][nftId];
        uint256 burns = _burns[account][nftId];
        if (mints > burns) {
            uint256 balance = balanceOf(account, nftId);
            uint256 difference = mints - burns;
            return balance * block.timestamp - difference;
        }
        return 0;
    }

    /** @return age seconds totalled over all stakes for given nft-id */
    function totalAgeOf(uint256 nftId) public view returns (uint256) {
        uint256 mintsTotal = _mintsTotal[nftId];
        uint256 burnsTotal = _burnsTotal[nftId];
        if (mintsTotal > burnsTotal) {
            uint256 supply = totalSupply(nftId);
            uint256 difference = mintsTotal - burnsTotal;
            return supply * block.timestamp - difference;
        }
        return 0;
    }

    /** remember mint action */
    function _pushMint(address account, uint256 nftId, uint256 amount) internal {
        require(amount > 0, "non-positive amount");
        _mints[account][nftId] += amount * block.timestamp;
        _mintsTotal[nftId] += amount * block.timestamp;
    }

    /** remember mint actions */
    function _pushMintBatch(address account, uint256[] memory nftIds, uint256[] memory amounts) internal {
        assert(nftIds.length == amounts.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            _pushMint(account, nftIds[i], amounts[i]);
        }
    }

    /** remember burn action */
    function _pushBurn(address account, uint256 nftId, uint256 amount) internal {
        require(amount > 0, "non-positive amount");
        _burns[account][nftId] += amount * block.timestamp;
        _burnsTotal[nftId] += amount * block.timestamp;
    }

    /** remember burn actions */
    function _pushBurnBatch(address account, uint256[] memory nftIds, uint256[] memory amounts) internal {
        assert(nftIds.length == amounts.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            _pushBurn(account, nftIds[i], amounts[i]);
        }
    }
}

/**
 * Staked NFT class for THOR tokens.
 */
contract XPowerThorNftStaked is XPowerNftStaked {
    constructor(
        string memory pptUri,
        address pptBase,
        uint256 deadlineIn
    ) XPowerNftStaked("XPower Thor", "THORPPT", pptUri, pptBase, deadlineIn) {}
}

/**
 * Staked NFT class for LOKI tokens.
 */
contract XPowerLokiNftStaked is XPowerNftStaked {
    constructor(
        string memory pptUri,
        address pptBase,
        uint256 deadlineIn
    ) XPowerNftStaked("XPower Loki", "LOKIPPT", pptUri, pptBase, deadlineIn) {}
}

/**
 * Staked NFT class for ODIN tokens.
 */
contract XPowerOdinNftStaked is XPowerNftStaked {
    constructor(
        string memory pptUri,
        address pptBase,
        uint256 deadlineIn
    ) XPowerNftStaked("XPower Odin", "ODINPPT", pptUri, pptBase, deadlineIn) {}
}
// File contracts/MoeTreasury.sol
// solhint-disable no-empty-blocks
pragma solidity ^0.8.0;


/**
 * Treasury to claim (MoE) tokens for staked XPowerNft(s).
 */
contract MoeTreasury is MoeTreasurySupervised {
    /** (burnable) *aged* XPower tokens */
    APower private _sov;
    /** (burnable) proof-of-work tokens */
    XPower private _moe;
    /** staked proof-of-work NFTs */
    XPowerNftStaked private _ppt;
    /** parametrization of APR: (nft.level+[5]-[4])*[3]/[2]+[1]-[0] */
    uint256[] private _apr = [0, 0, 3, 1000, 0, 0];
    /** parametrization of APR bonus: (age.year+[5]-[4])*[3]/[2]+[1]-[0] */
    uint256[] private _bonus = [0, 0, 1, 10, 0, 0];
    /** map of rewards claimed: account => nft-id => amount */
    mapping(address => mapping(uint256 => uint256)) private _claimed;
    /** map of rewards claimed total: nft-id => amount */
    mapping(uint256 => uint256) private _claimedTotal;

    /** @param sovLink address of contract for APower tokens */
    /** @param moeLink address of contract for XPower tokens */
    /** @param pptLink address of contract for staked NFTs */
    constructor(address sovLink, address moeLink, address pptLink) {
        _sov = APower(sovLink);
        _moe = XPower(moeLink);
        _ppt = XPowerNftStaked(pptLink);
    }

    /** @return balance of available tokens */
    function balance() public view returns (uint256) {
        address self = (address)(this);
        return _moe.balanceOf(self);
    }

    /** emitted on claiming NFT reward */
    event Claim(address account, uint256 nftId, uint256 amount);

    /** claim APower tokens for given account and nft-id */
    function claimFor(address account, uint256 nftId) public {
        uint256 amount = claimableFor(account, nftId);
        require(amount > 0, "nothing claimable");
        _claimed[account][nftId] += amount;
        _claimedTotal[nftId] += amount;
        _moe.increaseAllowance((address)(_sov), amount);
        _sov.mint(account, amount);
        emit Claim(account, nftId, amount);
    }

    /** emitted on claiming NFT rewards */
    event ClaimBatch(address account, uint256[] nftIds, uint256[] amounts);

    /** claim APower tokens for given account and nft-ids */
    function claimForBatch(address account, uint256[] memory nftIds) public {
        uint256[] memory amounts = claimableForBatch(account, nftIds);
        for (uint256 i = 0; i < nftIds.length; i++) {
            require(amounts[i] > 0, "nothing claimable");
            _claimed[account][nftIds[i]] += amounts[i];
            _claimedTotal[nftIds[i]] += amounts[i];
        }
        for (uint256 i = 0; i < nftIds.length; i++) {
            _moe.increaseAllowance((address)(_sov), amounts[i]);
            _sov.mint(account, amounts[i]);
        }
        emit ClaimBatch(account, nftIds, amounts);
    }

    /** @return claimed amount of tokens for given account and nft-id */
    function claimedFor(address account, uint256 nftId) public view returns (uint256) {
        return _claimed[account][nftId];
    }

    /** @return claimed total amount of tokens for nft-id */
    function totalClaimedFor(uint256 nftId) public view returns (uint256) {
        return _claimedTotal[nftId];
    }

    /** @return claimed amount of tokens for given account and nft-ids */
    function claimedForBatch(address account, uint256[] memory nftIds) public view returns (uint256[] memory) {
        uint256[] memory claimed = new uint256[](nftIds.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            claimed[i] = claimedFor(account, nftIds[i]);
        }
        return claimed;
    }

    /** @return claimed total amount of tokens for given nft-ids */
    function totalClaimedForBatch(uint256[] memory nftIds) public view returns (uint256[] memory) {
        uint256[] memory claimedTotal = new uint256[](nftIds.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            claimedTotal[i] = totalClaimedFor(nftIds[i]);
        }
        return claimedTotal;
    }

    /** @return claimable amount of tokens for given account and nft-id */
    function claimableFor(address account, uint256 nftId) public view returns (uint256) {
        uint256 claimed = claimedFor(account, nftId);
        uint256 reward = rewardOf(account, nftId);
        if (reward > claimed) {
            return reward - claimed;
        }
        return 0;
    }

    /** @return claimable total amount of tokens for given nft-id */
    function totalClaimableFor(uint256 nftId) public view returns (uint256) {
        uint256 claimedTotal = totalClaimedFor(nftId);
        uint256 rewardTotal = totalRewardOf(nftId);
        if (rewardTotal > claimedTotal) {
            return rewardTotal - claimedTotal;
        }
        return 0;
    }

    /** @return claimable amount of tokens for given account and nft-ids */
    function claimableForBatch(address account, uint256[] memory nftIds) public view returns (uint256[] memory) {
        uint256[] memory claimed = claimedForBatch(account, nftIds);
        uint256[] memory rewards = rewardOfBatch(account, nftIds);
        uint256[] memory pending = new uint256[](nftIds.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            if (rewards[i] > claimed[i]) {
                pending[i] = rewards[i] - claimed[i];
            } else {
                pending[i] = 0;
            }
        }
        return pending;
    }

    /** @return claimable total amount of tokens for given nft-ids */
    function totalClaimableForBatch(uint256[] memory nftIds) public view returns (uint256[] memory) {
        uint256[] memory claimedTotal = totalClaimedForBatch(nftIds);
        uint256[] memory rewardsTotal = totalRewardOfBatch(nftIds);
        uint256[] memory pendingTotal = new uint256[](nftIds.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            if (rewardsTotal[i] > claimedTotal[i]) {
                pendingTotal[i] = rewardsTotal[i] - claimedTotal[i];
            } else {
                pendingTotal[i] = 0;
            }
        }
        return pendingTotal;
    }

    /** @return reward of tokens for given account and nft-id */
    function rewardOf(address account, uint256 nftId) public view returns (uint256) {
        uint256 age = _ageOf(account, nftId);
        uint256 denomination = _denominationOf(_levelOf(nftId));
        uint256 apr = aprOf(nftId);
        uint256 aprBonus = aprBonusOf(nftId);
        uint256 reward = (apr * age * denomination) / (1_000 * 365_25 days);
        uint256 rewardBonus = (aprBonus * age * denomination) / (1_000 * 365_25 days);
        return (reward + rewardBonus) * 10 ** _moe.decimals();
    }

    /** @return reward total of tokens for given nft-id */
    function totalRewardOf(uint256 nftId) public view returns (uint256) {
        uint256 age = _totalAgeOf(nftId);
        uint256 denomination = _denominationOf(_levelOf(nftId));
        uint256 apr = aprOf(nftId);
        uint256 aprBonus = aprBonusOf(nftId);
        uint256 reward = (apr * age * denomination) / (1_000 * 365_25 days);
        uint256 rewardBonus = (aprBonus * age * denomination) / (1_000 * 365_25 days);
        return (reward + rewardBonus) * 10 ** _moe.decimals();
    }

    /** @return reward of tokens for given account and nft-ids */
    function rewardOfBatch(address account, uint256[] memory nftIds) public view returns (uint256[] memory) {
        uint256[] memory rewards = new uint256[](nftIds.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            rewards[i] = rewardOf(account, nftIds[i]);
        }
        return rewards;
    }

    /** @return reward total of tokens for given nft-ids */
    function totalRewardOfBatch(uint256[] memory nftIds) public view returns (uint256[] memory) {
        uint256[] memory rewardsTotal = new uint256[](nftIds.length);
        for (uint256 i = 0; i < nftIds.length; i++) {
            rewardsTotal[i] = totalRewardOf(nftIds[i]);
        }
        return rewardsTotal;
    }

    /** @return apr i.e. annual percentage rate (per nft.level) */
    function aprOf(uint256 nftId) public view returns (uint256) {
        uint256 level = _ppt.levelOf(nftId);
        return ((level + _apr[5] - _apr[4]) * _apr[3]) / _apr[2] + _apr[1] - _apr[0];
    }

    /** @return apr-parameters */
    function getAPR() public view returns (uint256[] memory) {
        return _apr;
    }

    /** set apr-parameters */
    function setAPR(uint256[] memory array) public onlyRole(APR_ROLE) {
        require(array.length == 6, "invalid array.length");
        _apr = array;
    }

    /** @return apr-bonus i.e. annual percentage rate (per nft.year) */
    function aprBonusOf(uint256 nftId) public view returns (uint256) {
        uint256 nowYear = _ppt.year();
        uint256 nftYear = _ppt.yearOf(nftId);
        uint256 ageYear = nowYear > nftYear ? nowYear - nftYear : 0;
        return ((ageYear + _bonus[5] - _bonus[4]) * _bonus[3]) / _bonus[2] + _bonus[1] - _bonus[0];
    }

    /** @return apr-bonus parameters */
    function getAPRBonus() public view returns (uint256[] memory) {
        return _bonus;
    }

    /** set apr-bonus parameters */
    function setAPRBonus(uint256[] memory array) public onlyRole(APR_BONUS_ROLE) {
        require(array.length == 6, "invalid array.length");
        _bonus = array;
    }

    /** @return age seconds for given account and nft-id */
    function _ageOf(address account, uint256 nftId) internal view returns (uint256) {
        return _ppt.ageOf(account, nftId); // nft.balance * nft.average-age
    }

    /** @return age total seconds for given nft-id */
    function _totalAgeOf(uint256 nftId) internal view returns (uint256) {
        return _ppt.totalAgeOf(nftId); // nft.supply * nft.average-age
    }

    /** @return denomination value for given nft-level */
    function _denominationOf(uint256 nftLevel) internal view returns (uint256) {
        return _ppt.denominationOf(nftLevel); // 1, 1K, 1M, 1G, ...
    }

    /** @return level for given nft-id */
    function _levelOf(uint256 nftId) internal view returns (uint256) {
        return _ppt.levelOf(nftId); // 0, 3, 6, 9, ...
    }
}

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