// File: @openzeppelin/contracts/utils/introspection/IERC165.sol

// SPDX-License-Identifier: MIT

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/token/ERC721/IERC721.sol


pragma solidity ^0.8.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// File: contracts/interfaces/IHuxleyComics.sol

pragma solidity 0.8.6;

 
interface IHuxleyComics is IERC721 {
    struct Issue {
        uint256 price;
        uint256 goldSupplyLeft;
        uint256 firstEditionSupplyLeft;
        uint256 holographicSupplyLeft;
        uint256 serialNumberToMintGold;
        uint256 serialNumberToMintFirstEdition;
        uint256 serialNumberToMintHolographic;
        uint256 maxPayableMintBatch;
        string uri;
        bool exist;
    }

    struct Token {
        uint256 serialNumber;
        uint256 issueNumber;
        TokenType tokenType;
    }

    enum TokenType {FirstEdition, Gold, Holographic}

    function safeMint(address _to) external returns (uint256);

    function getCurrentIssue() external returns (uint256 _currentIssue);
    function getCurrentPrice() external returns (uint256 _currentPrice);
    function getCurrentMaxPayableMintBatch() external returns (uint256 _currentMaxPayableMintBatch);

    function createNewIssue(
        uint256 _price,
        uint256 _goldSupply,
        uint256 _firstEditionSupply,
        uint256 _holographicSupply,
        uint256 _startSerialNumberGold,
        uint256 _startSerialNumberFirstEdition,
        uint256 _startSerialNumberHolographic,
        uint256 _maxPaybleMintBatch,
        string memory _uri
    ) external;

    function getIssue(uint256 _issueNumber) external returns (Issue memory _issue);

    function getToken(uint256 _tokenId) external returns (Token memory _token);

    function setTokenDetails(uint256 _tokenId, TokenType _tokenType) external;

    function setBaseURI(uint256 _issueNumber, string memory _uri) external;

    function setCanBurn(bool _canBurn) external;
}

// File: @openzeppelin/contracts/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/Strings.sol


pragma solidity ^0.8.0;

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

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

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

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

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

// File: @openzeppelin/contracts/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/AccessControl.sol


pragma solidity ^0.8.0;




/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    function hasRole(bytes32 role, address account) external view returns (bool);

    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    function grantRole(bytes32 role, address account) external;

    function revokeRole(bytes32 role, address account) external;

    function renounceRole(bytes32 role, address account) external;
}

/**
 * @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 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 {_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 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]{20}) is missing role (0x[0-9a-f]{32})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

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

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

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

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

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

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

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

        _revokeRole(role, account);
    }

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

    function _grantRole(bytes32 role, address account) private {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// File: @openzeppelin/contracts/security/Pausable.sol


pragma solidity ^0.8.0;


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

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

    bool private _paused;

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol


pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return recover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return recover(hash, r, vs);
        } else {
            revert("ECDSA: invalid signature length");
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`, `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        require(
            uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
            "ECDSA: invalid signature 's' value"
        );
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// File: @openzeppelin/contracts/utils/Address.sol


pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

// File: @openzeppelin/contracts/interfaces/IERC1271.sol


pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC1271 standard signature validation method for
 * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
 *
 * _Available since v4.1._
 */
interface IERC1271 {
    /**
     * @dev Should return whether the signature provided is valid for the provided data
     * @param hash      Hash of the data to be signed
     * @param signature Signature byte array associated with _data
     */
    function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
}

// File: @openzeppelin/contracts/utils/cryptography/SignatureChecker.sol


pragma solidity ^0.8.0;




/**
 * @dev Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and
 * ERC1271 contract sigantures. Using this instead of ECDSA.recover in your contract will make them compatible with
 * smart contract wallets such as Argent and Gnosis.
 *
 * Note: unlike ECDSA signatures, contract signature's are revocable, and the outcome of this function can thus change
 * through time. It could return true at block N and false at block N+1 (or the opposite).
 *
 * _Available since v4.1._
 */
library SignatureChecker {
    function isValidSignatureNow(
        address signer,
        bytes32 hash,
        bytes memory signature
    ) internal view returns (bool) {
        if (Address.isContract(signer)) {
            try IERC1271(signer).isValidSignature(hash, signature) returns (bytes4 magicValue) {
                return magicValue == IERC1271(signer).isValidSignature.selector;
            } catch {
                return false;
            }
        } else {
            return ECDSA.recover(hash, signature) == signer;
        }
    }
}

// File: contracts/HuxleyComicsOps.sol

pragma solidity 0.8.6;





/**
 * @title HuxleyComicsOps
 * @dev This contract allows minting HuxleyComics tokens.
 * Users can pay to mint tokens when not paused.
 *
 */
contract HuxleyComicsOps is Pausable, AccessControl {
    using SignatureChecker for address;

    address public trustedWallet_A;
    address public trustedWallet_B;

    // address used to sign whitelisted addresses
    address public signer;

    // ER721 Huxley Comics Token
    IHuxleyComics public huxleyComics;

    // Mapping from blacklisted addresses
    mapping(address => bool) public blacklisted;

    // Mapping from address to amount of tokens purchased per issue number
    mapping(address => mapping(uint256 => uint256)) public purchased;

    // Role that can call createIssue(), setBaseURI(), privateMint...Batch() and setBlacklisted()
    bytes32 public constant OPERATIONS_ROLE = keccak256("OPERATIONS_ROLE");

    event FundsTransfered(address _wallet, uint256 _amount);
    event IssueCreated(address _sender, uint256 _newIssue);
    event StartedBurn(address _sender);
    event StoppedBurn(address _sender);
    event IssueBaseURIUpdated(address _sender, string _uri);
    event FreeMintExecuted(address _sender);
    event FirstEditionMintExecuted(address _sender, uint256 _paid);

    /**
     * @dev Creates an instance of `HuxleyComicsOps`.
     *
     * 'msg.sender' gets the Admin role. '_trustedWallet_A' and '_trustedWallet_B' are wallets that will receive
     * funds. '_huxLeyComics' is the address of the HuxleyComics Token smart contract.
     *
     * Also sets contract to 'paused' state.
     */
    constructor(
        address _operationAddress,
        address _trustedWallet_A,
        address _trustedWallet_B,
        address _huxLeyComics
    ) {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(OPERATIONS_ROLE, _operationAddress);

        trustedWallet_A = _trustedWallet_A;
        trustedWallet_B = _trustedWallet_B;

        huxleyComics = IHuxleyComics(_huxLeyComics);

        signer = msg.sender;

        _pause();
    }

    /**
     * @dev It creates a new Issue. Checks if contract is 'paused' and pauses it otherwise.
     * It calls 'createNewIssue' from the HuxleyComics contract.
     * Only an address with Operations Role can call this function.
     *
     * Emits a {IssueCreated} event.
     *
     * @param _price Price for each token to be minted in wei
     * @param _goldSupply Total supply of Gold token
     * @param _firstEditionSupply Total supply of First Edition token
     * @param _holographicSupply Total supply of Holographic token
     * @param _startSerialNumberGold Initial serial number for Gold token
     * @param _startSerialNumberFirstEdition Initial serial number for First Edition token
     * @param _startSerialNumberHolographic Initial serial number for Holographic token
     * @param _maxPayableMintBatch Max amount of tokens that can be minted when calling batch functions (should not be greater than 100 so it won't run out of gas)
     * @param _uri Uri for the tokens of the issue
     */
    function createIssue(
        uint256 _price,
        uint256 _goldSupply,
        uint256 _firstEditionSupply,
        uint256 _holographicSupply,
        uint256 _startSerialNumberGold,
        uint256 _startSerialNumberFirstEdition,
        uint256 _startSerialNumberHolographic,
        uint256 _maxPayableMintBatch,
        string memory _uri
    ) external onlyRole(OPERATIONS_ROLE) {
        if (!paused()) {
            _pause();
        }

        huxleyComics.createNewIssue(
            _price,
            _goldSupply,
            _firstEditionSupply,
            _holographicSupply,
            _startSerialNumberGold,
            _startSerialNumberFirstEdition,
            _startSerialNumberHolographic,
            _maxPayableMintBatch,
            _uri
        );

        emit IssueCreated(msg.sender, huxleyComics.getCurrentIssue());
    }

    /**
     * @dev Sets a new uri for an Issue. Only an address with Operations Role can call this function.
     *      Emits a {IssueBaseURIUpdated} event.
     * @param _issueNumber issueNumber
     * @param _uri uri
     */
    function setBaseURI(uint256 _issueNumber, string memory _uri)
        external
        onlyRole(OPERATIONS_ROLE)
    {
        huxleyComics.setBaseURI(_issueNumber, _uri);

        emit IssueBaseURIUpdated(msg.sender, _uri);
    }

    /**
     * @dev Mint a free token of type First Edition for Issue #1. Whitelisted addresses can free mint one token.
     *      Emits a {FreeMintExecuted} event.
     * @param signature Message signed by 'signer' adddress to allow a wallet to free mint.
     */
    function freeMint(bytes memory signature) external {
        require(huxleyComics.getCurrentIssue() == 1, "Huxley: not issue 1");
        require(!blacklisted[msg.sender], "Huxley: blacklisted");
        require(isWhitelisted(signature), "Huxley: not whtl");
        require(isFirstToken(), "Huxley: not first");

        _mint(IHuxleyComics.TokenType.FirstEdition, 1);

        emit FreeMintExecuted(msg.sender);
    }

    /// @dev Mint a FirstEdition token for a price
    /// Emits a {FirstEditionMintExecuted} event.
    function payableMint() external payable whenNotPaused {
        uint256 price = huxleyComics.getCurrentPrice();
        require(price == msg.value, "Huxley: invalid price");

        uint256 maxPayableMintBatch = huxleyComics.getCurrentMaxPayableMintBatch();

        _mint(IHuxleyComics.TokenType.FirstEdition, maxPayableMintBatch);

        payment();

        emit FirstEditionMintExecuted(msg.sender, msg.value);
    }

    /**
     *  @dev Batch mint tokens for a price. Value should be equal to '_amountToMint1' x 'Issue.price'.
     *  @param _amountToMint Amount of tokens to be minted. 
                             It should be greater than 0 and less or equal than 'Issue.maxPayableMintBatch'
     */
    function payableMintBatch(uint256 _amountToMint) external payable whenNotPaused {
        require(_amountToMint > 0, "Huxley: batch is 0");

        uint256 maxPayableMintBatch = huxleyComics.getCurrentMaxPayableMintBatch();
        require(_amountToMint <= maxPayableMintBatch, "Huxley: max batch");

        uint256 price = huxleyComics.getCurrentPrice();
        price = price * _amountToMint;

        require(price == msg.value, "Huxley: invalid price");

        for (uint256 i = 1; i <= _amountToMint; i++) {
            _mint(IHuxleyComics.TokenType.FirstEdition, maxPayableMintBatch);
        }

        payment();
    }

    /// @dev Split value paid for a token
    /// Emits two {FundsTransfered} events.
    function payment() internal {
        uint256 amount = (msg.value * 85) / 100;
        (bool success, ) = trustedWallet_A.call{value: amount}("");
        require(success, "HV: Transfer A failed");
        emit FundsTransfered(trustedWallet_A, amount);

        amount = msg.value - amount;
        (success, ) = trustedWallet_B.call{value: amount}("");
        require(success, "HV: Transfer B failed");
        emit FundsTransfered(trustedWallet_B, amount);
    }

    /// @dev Allows team to mint FirstEdition token
    function privateMintFirstEditionBatch(uint256 _amountToMint)
        external
        onlyRole(OPERATIONS_ROLE)
    {
        privateMintBatch(_amountToMint, IHuxleyComics.TokenType.FirstEdition);
    }

    /// @dev Allows team to mint Gold token
    function privateMintGoldBatch(uint256 _amountToMint) external onlyRole(OPERATIONS_ROLE) {
        privateMintBatch(_amountToMint, IHuxleyComics.TokenType.Gold);
    }

    /// @dev Allows team to mint Holographic token
    function privateMintHolographicBatch(uint256 _amountToMint)
        external
        onlyRole(OPERATIONS_ROLE)
    {
        privateMintBatch(_amountToMint, IHuxleyComics.TokenType.Holographic);
    }

    /// @dev Batch mint tokens. It should not be greater than 100 to avoid running out of gas
    function privateMintBatch(uint256 _amountToMint, IHuxleyComics.TokenType _tokenType) internal {
        require(_amountToMint > 0, "Huxley: amount is 0");
        for (uint256 i = 1; i <= _amountToMint; i++) {
            _privateMint(_tokenType, true, 0);
        }
    }

    /**
     * @dev Mints a token of an specific 'Token.Type'. It can be 'FirstEdition', 'Gold' or 'Holographic'
     * @param _tokenType Token Type that will be minted
     */
    function _mint(IHuxleyComics.TokenType _tokenType, uint256 _maxAmount) internal {
        _privateMint(_tokenType, false, _maxAmount);
    }

    /**
     * @dev Mints a token of a specific 'Token.Type'. It can be 'FirstEdition', 'Gold' or ' 'Holographic'
     * @param _tokenType Token Type that will be minted
     */
    function _privateMint(IHuxleyComics.TokenType _tokenType, bool _isPrivateMint, uint256 _maxAmount) internal {
        if(!_isPrivateMint){
            uint256 totalTokenspurchased = purchased[msg.sender][huxleyComics.getCurrentIssue()];
            require(totalTokenspurchased < _maxAmount, "Huxley: over max amount");
            
            // update total amount of tokens purchased for current issue
            purchased[msg.sender][huxleyComics.getCurrentIssue()] = totalTokenspurchased + 1;
        }

        // mint and get token id
        uint256 tokenId = huxleyComics.safeMint(msg.sender);
        huxleyComics.setTokenDetails(tokenId, _tokenType);
    }

    // Setup functions

    /**
     * @dev Updates address of 'trustedWallet_A'
     * @param _trustedWallet  New address for 'trustedWallet_A'
     */
    function setTrustedWallet_A(address _trustedWallet) external onlyRole(DEFAULT_ADMIN_ROLE) {
        trustedWallet_A = _trustedWallet;
    }

    /**
     * @dev Updates address of 'trustedWallet_B'
     * @param _trustedWallet  New address for 'trustedWallet_B'
     */
    function setTrustedWallet_B(address _trustedWallet) external onlyRole(DEFAULT_ADMIN_ROLE) {
        trustedWallet_B = _trustedWallet;
    }

    /**
     * @dev Updates address of 'signer'
     * @param _signer  New address for 'signer'
     */
    function setSigner(address _signer) external onlyRole(DEFAULT_ADMIN_ROLE) {
        signer = _signer;
    }

    /// @dev Returns if user already has a token
    function isFirstToken() internal view returns (bool) {
        uint256 balance = huxleyComics.balanceOf(msg.sender);
        return balance == 0;
    }

    /// @dev Returns if user is whitelisted to free mint 1 token.
    function isWhitelisted(bytes memory signature) internal view returns (bool) {
        bytes32 result = keccak256(abi.encodePacked(msg.sender));
        bytes32 hash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", result));
        return signer.isValidSignatureNow(hash, signature);
    }

    /**
     * @dev Sets if an address is blacklist or not
     * @param _addr Address to update in the blacklist list
     * @param _value Use 'True' to blacklist '_addr', 'False' otherwise
     */
    function setBlacklisted(address _addr, bool _value) external onlyRole(OPERATIONS_ROLE) {
        blacklisted[_addr] = _value;
    }

    /// @dev Pause payableMint()
    function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _pause();
    }

    /// @dev Unpause payableMint()
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
        _unpause();
    }

    /// @dev Start the possibility to burn tokens
    /// Emits {StartedBurn} event.
    function startBurn() external onlyRole(DEFAULT_ADMIN_ROLE) {
        huxleyComics.setCanBurn(true);
        emit StartedBurn(msg.sender);
    }

    /// @dev Stop the possibility to burn tokens
    /// Emits {StoppedBurn} event.
    function stopBurn() external onlyRole(DEFAULT_ADMIN_ROLE) {
        huxleyComics.setCanBurn(false);
        emit StoppedBurn(msg.sender);
    }
    // End Burn Requirement
}
{"success": true, "error": null, "results": {"detectors": [{"check": "unused-return", "impact": "Medium", "confidence": "Medium"}, {"check": "reentrancy-no-eth", "impact": "Medium", "confidence": "Medium"}, {"check": "incorrect-equality", "impact": "Medium", "confidence": "High"}, {"check": "uninitialized-local", "impact": "Medium", "confidence": "Medium"}]}}