// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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() {
        _setOwner(_msgSender());
    }

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

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

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @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.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` 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 tokenId
    ) internal virtual {}
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

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



// SPDX-License-Identifier: MIT

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);
    }

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

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

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



// SPDX-License-Identifier: MIT

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



// SPDX-License-Identifier: MIT

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/cryptography/MerkleProof.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        bytes32 computedHash = leaf;

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

// 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: /contracts/DeezChristmasNuts.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";


contract OwnableDelegateProxy {}

contract ProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
}

contract DeezChristmasNuts is ERC721, Ownable {
    
    string public baseURI;
    
    uint16 MAX_NUTS = 3900;
    
    uint16 public totalSupply = 0;

    address proxyRegistryAddress;

    mapping(address => uint256) whitelist;

    mapping(address => uint256) alreadyMinted;

    bytes32 quadMerkleRoot = 0x8a5f23696618d8ec08d8ff0eddfdbea4115d7adc3338a9fc35f25e5f4a70b6b8;
    bytes32 tripleMerkleRoot = 0xdfa0cf29b15a72bd6811b80ca03972535022644df6a45542e8bc2c7f1a7d2565;
    bytes32 doubleMerkleRoot = 0x40de5e23047e3a36df0cdc034ad11cbef7c2db757629ee2b026386e7d0a92db0;
    bytes32 singleMerkleRoot = 0x1dd6f0f46cc19d13a505c433b4ceaad206e8143c68e5b77ee912f19c8ebc6225;

    bool public whitelistMinting;

    constructor(address _proxyRegistryAddress) ERC721("DeezChristmasNuts", "DCN") {
        proxyRegistryAddress = _proxyRegistryAddress;
        whitelistMinting = false;

        whitelist[0xEf72D8793Ab32d20358aa0303ae1405E8B695DA6] = 40;
        whitelist[0x4aE91684870B8B9C30fD79eF329dbaa96487948E] = 7;
        whitelist[0xBC2E6F35B3a525DEAa87919746cf6734E7591599] = 14;
        whitelist[0x0aBa7aAB3cA8B6330C9aE4C7989f347b5D4c9845] = 17;
        whitelist[0x177a683dCB55Dea54c422a15f4dF5bbcf4555985] = 19;
        whitelist[0xfDCF1850AF279738a00037486dA9A23e34E29bc1] = 6;
        whitelist[0x9c3bcBB07A40326B4A44D49df2Bdb83E6bce92aA] = 25;
        whitelist[0x19b44654A1FdD943AF5fb7fBC2C543fC7089A48a] = 5;
        whitelist[0x5bC124b3F28C301F497D3d44eB5c3225651143cb] = 27;
        whitelist[0x1097F467E199018e1F2E506cb646431E863C417f] = 9;
        whitelist[0x719f075ffFF05F1Ea5be249E1C160FFeEa881879] = 28;
        whitelist[0x27Da09392eb0a29511daB80F37f794FB7A103b3b] = 24;
        whitelist[0x82815C90D40073Ad14e1D0cB5bccbf8883862483] = 40;
        whitelist[0x27731cfE14982b9ccF8f7f9149B0CF854c51CA80] = 8;
        whitelist[0x1878388d2AbEF1D5305e2BF1c3Faaf2Cef037a8a] = 10;
        whitelist[0x9809F8AB3767555De4A41dC5E1Ffc15603B947c4] = 21;
        whitelist[0xFeEbB7251827A89143049d400573f71f54676adf] = 6;
        whitelist[0x0228dce3FDBc8381CDfCb3F7Ba9aa08f79b53D11] = 7;
        whitelist[0xfF47e41188Ed3B6598BD30730EccaCeF47985e7D] = 8;
        whitelist[0xa81D50239B25B41Ae762F481dA4DFE2F988A9211] = 35;
        whitelist[0x91684937A44b8bbee1aC193B753Ad50Ae16FC5F0] = 15;
        whitelist[0xAC701696fB691AE00a4d84C67b345Ba55f1C62a3] = 13;
        whitelist[0x9499054d02A725316d61fA896c29D58550ee4a5b] = 5;
        whitelist[0xD9CA2B65B8a90589a16354Ea178A14427b10AD32] = 5;
        whitelist[0x59AdCFcC37c5e58D954fb07162e3d0a14627E595] = 29;
        whitelist[0xD8e84A531b25faaFDa8C59F47ffCf41238AE2005] = 15;
        whitelist[0x54669Ca58bf3A59CaeA8AE5135Db491E4738f65A] = 26;
        whitelist[0x85Bf85Be063129f69D4D1633925A2E440805165A] = 5;
        whitelist[0x61431F590f9bFd848C7d51317A5e7d6e45bEccA2] = 26;
        whitelist[0x1b4b91bb747176451F0F7f73b636baBAfCF31Cc4] = 8;
        whitelist[0x9E68a58209aE4B04755CCEcD2E24A9dD0470755e] = 18;
        whitelist[0xd37893681919ab6b73A402c8E768F5E0ae54B52b] = 7;
        whitelist[0x19F25427742d51289AbA0F0D0EFB7C9d94EE02Db] = 10;
        whitelist[0xDaAf0EE861d80225FB906aeded033B034CA0bc7c] = 6;
        whitelist[0x1fbF4789Ac39De79936cCC29FA6789Db6848a275] = 7;
        whitelist[0x22d6d82aca6065547946b58DcEd7201670d1c1D0] = 12;
        whitelist[0xa28A86E0eAd66214efDC20E3c8193D0cE09268D1] = 14;
        whitelist[0xc5f5380FB9A03526bC256A5C8dfc845Eb9ade311] = 6;
        whitelist[0x791eE19eD660135878D35908D183b7171314D65D] = 8;
        whitelist[0xE3b42E0d193feB565D6fdF27571c178b887e274f] = 17;
        whitelist[0x56a5BBfB753CE8bC7bdeaAF5f68B073a658487B2] = 10;
        whitelist[0xCC850794Ba01EBD8142c8ca32e735f1A942068a0] = 5;
        whitelist[0x08Df0997964fAE66474C4A9Ddb1F7346aC5B5755] = 7;
        whitelist[0x0cac1CA1224c9793975DF39fDB6da713fe5eBA0A] = 5;
        whitelist[0x170a6428e8c06b2Bf63Eb5C32255125E251f7C4a] = 10;
        whitelist[0x8f2838D10F1047Db59D16FC617456C2d4EdA1BA4] = 8;
        whitelist[0x6cdF86e8892CDf00a7a144D81eDb8e8fb6325461] = 7;
        whitelist[0x00818d05Ec157c1E7A77E132761F5553e7800d49] = 5;
        whitelist[0x25aaD7773Ab2cE31b912381e81D3B8e38853FEC6] = 7;
        whitelist[0x379F2C9EE2EC7e52993222Ca95a067f20418CB91] = 9;
        whitelist[0xFce4B6287D101738d133a0AA7b5563316D1A04Dd] = 6;
        whitelist[0x1cb4bFA85adDbe39c028eEEF7f3677Abd86Eb8F6] = 15;
        whitelist[0xc9377B597CA47A54387C11C3bF257e226672C444] = 7;
        whitelist[0xb76f62C8995a14379A3D6d7BCBb8848473C63a29] = 9;
        whitelist[0x4577F7e3e6D7F249f3A4035c96bF14722eF5cfeC] = 7;
        whitelist[0x3810353c0eA030369c48448F992674657e77FDfa] = 5;
        whitelist[0xd88809018C63aB48c284342E24C11805d4870D43] = 5;
        whitelist[0x9f876D90731ea9d8B368BbC1e050A2082077085e] = 6;
        whitelist[0x4344Cf6B85BA6DD3A78ad051459cb1599B68124b] = 6;
        whitelist[0xEa5039f7346F0eE37C943c79dD368C78F0bc8Bac] = 5;
        whitelist[0x1cCDE298D9eA5621B7072caC8196db222164aa50] = 6;
        whitelist[0x7f5bEf39af11AA83dBC4366Dc12053834C1524f6] = 5;
        whitelist[0x274a5F5Ea6a2E0D184800FE891C4Aa5bCc715347] = 11;
        whitelist[0x0F293E7091aA4Fd1002Ee9D98Dd94Bbd310541b0] = 5;
        whitelist[0xf264330b74148F6717b60645350603Be913C0a91] = 5;
        whitelist[0xfa12CD4642C25f893CcBCb9c4b5FeF4c402940E7] = 7;
        whitelist[0x224F0f63DDcb29E9b53277D9000315d04Cc7CB8F] = 5;
        whitelist[0xdeeb758e147ea422E6bAd89bcfAFAbfAc0527949] = 16;
        whitelist[0x2cDA849421183AEFb697455E5610Db2ddF00dD1a] = 6;
        whitelist[0x4676B78d1eF20149d45bfC7eF3Fe4f127c184Be6] = 10;
        whitelist[0x94b5849D9880D5918E4C75e60c84F1c77EF627BF] = 6;
        whitelist[0x96acC14F8d521546637C3f4A6e08127da0f46139] = 5;
        whitelist[0x553aAcf16E6496F2778D810Ae37352C6342bd854] = 5;
        whitelist[0x02DEE48A27027B09b62ad062DC5e08B78eeE59E2] = 7;
        whitelist[0x548E68E4b2d2c0E02bBC43A29DF74B30C5BA1248] = 5;
        whitelist[0xa2F3AD23574867471231126B3C1a5B9b5c663E9A] = 5;
        whitelist[0x389Ea24a2f22E0113Efd1ae606B8E11659FAA8C8] = 12;
        whitelist[0xF4Dc66D1802d76D3B663556ff96F1F35dD01a9BB] = 5;
        whitelist[0xe705E2Cc9cCF39615f3a58fcc0F0D8fB0b6403bD] = 5;
        whitelist[0xD3acb55e8a58a29139e9404dEE5F0bAE5a21c7DA] = 6;
        whitelist[0xf4C3bc30D17B87462397BCBa443361056DC9E31D] = 5;
        whitelist[0xE7A5b718e6111eb3e389668cb76064C19AFDBc78] = 12;
        whitelist[0xdb2b59095Df5a0968DA15B5524f7773f37139528] = 5;
        whitelist[0x056171A08fe9cB2746A3F73C5d8d7c9c211754FF] = 5;
        whitelist[0x44ACeC69a158aAA061C364F8e83275a408B64fb3] = 6;
        whitelist[0x0C377e9832490D17b7F3F27f293386aDd677eD7B] = 5;
        whitelist[0xA21a8e443d516383B2f4108d581D4B4FD767214D] = 5;
        whitelist[0x75ee810CDcDd8750457BA6201F063B33CeBD0E71] = 10;
        whitelist[0x071Ee0E8A94184013cEB38a32d726012872E5354] = 5;
        whitelist[0x048977752E8163EF75e71B4D526e0a36F07A6DD5] = 6;
        whitelist[0x65607550d5D8233772ff5f09b668151381E80c12] = 5;
        whitelist[0xe5B2ebD020CaeB2CBa3d08d9748A7F2D257d1B24] = 5;
        whitelist[0x6d3A613DA670c4d12EA7B29B5774c60C6aeee955] = 5;
        whitelist[0x35389b42afDFca76317aE60920Cf6ae4406d2171] = 33;
        whitelist[0x6478c54d7e93801950Ef4970424D2E84BD1A7eA1] = 6;
        whitelist[0x801f59E2e3373e5401df55b37dC6E6f64bC82BBA] = 9;
        whitelist[0xF7c3ed5ae30561C65b3cd13cc265A5753Ba212Ef] = 33;
        whitelist[0x2b177fdb87A9Bab54b55f1eFf89B0Cf785513403] = 8;
        whitelist[0x01Fb51F8A664f0f2B7cf8f6EEE89F7C1b7e05Ba1] = 6;
        whitelist[0x2E999C8441e6EcA993966f1826199c8260D7237E] = 5;
        whitelist[0x7687B0b3ECD4D659aB6471c75FbeE8C6b069Bb27] = 5;
        whitelist[0x8aD5659a9c25Ee536cBF59c4d61BE4Ae27d25D0F] = 27;
        whitelist[0x37b8218472B7Ae973a94075eEBFa669C1fed0Ffd] = 5;
        whitelist[0x5Bf86144556B3EC85ce16efFb3e2fc458fF18F0B] = 5;
        whitelist[0xFA43c78aF9E7aa87DCB1E552645b27CC952108DD] = 7;
        whitelist[0x4aBff092BbF9e5705ba5216478F3AD0e3468b7E0] = 6;
        whitelist[0x19f8683373259db0c92360BC89D5D8e3624154df] = 5;
        whitelist[0xDAE5F98819cCC28E996c264E63421DB09b307B38] = 5;
        whitelist[0x2dAA384aE89124498D2Ab8115c6E5f2b6eE9d3De] = 5;
        whitelist[0x805b01E7F3Fe127769B249763250222630968b4d] = 7;
        whitelist[0xd5a9C4a92dDE274e126f82b215Fccb511147Cd8e] = 7;
        whitelist[0x32525ad3d4f20eA6732b5069CBD057a861a5Cb61] = 5;
        whitelist[0x7C229eC494Bc316dbAaf4eAB0FBbc19678eA315f] = 8;
        whitelist[0x004e20Cd7d2188fB812BfdB3F8F8bf3b3dA05874] = 5;
        whitelist[0x6e72A7916B0c2d6b09F7DBe8ee60536429633856] = 10;
    }

    function withdraw() public onlyOwner {
        uint256 balance = address(this).balance;
        payable(msg.sender).transfer(balance);
    }

    function setBaseURI(string memory base) public onlyOwner {
        baseURI = base;
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return baseURI;
    }

    function whitelistMint(uint256 amount) external {
        require(whitelistMinting, "Whitelist minting isn't allowed yet");
        require(totalSupply + amount <= MAX_NUTS, "Purchase would exceed max supply");
        require(whitelist[msg.sender] > 0, "Sender is not whitelisted!");
        require(alreadyMinted[msg.sender] + amount <= whitelist[msg.sender], "Mint amount would exceed allowance");

        for (uint256 i = 0; i < amount; i++) {
            _safeMint(msg.sender, totalSupply + 1);
            totalSupply += 1;
        }
        alreadyMinted[msg.sender] = alreadyMinted[msg.sender] + amount; 
    }

    function mintQuadMerkle(bytes32[] calldata _merkleProof) external {
        require(whitelistMinting, "Whitelist minting isn't allowed yet");
        require(totalSupply + 4 <= MAX_NUTS, "Purchase would exceed max supply");
        require(alreadyMinted[msg.sender] < 4, "User already minted 4!");

        bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
        require(MerkleProof.verify(_merkleProof, quadMerkleRoot, leaf), "User not whitelisted for 4 mints");

        for (uint256 i = 0; i < 4; i++) {
            _safeMint(msg.sender, totalSupply + 1);
            totalSupply += 1;
        }
        alreadyMinted[msg.sender] = 4;

    }

    function mintTripleMerkle(bytes32[] calldata _merkleProof) external {
        require(whitelistMinting, "Whitelist minting isn't allowed yet");
        require(totalSupply + 3 <= MAX_NUTS, "Purchase would exceed max supply");
        require(alreadyMinted[msg.sender] < 3, "User already minted 3!");

        bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
        require(MerkleProof.verify(_merkleProof, tripleMerkleRoot, leaf), "User not whitelisted for 3 mints");

        for (uint256 i = 0; i < 3; i++) {
            _safeMint(msg.sender, totalSupply + 1);
            totalSupply += 1;
        }  

        alreadyMinted[msg.sender] = 3;
        
    }

    function mintDoubleMerkle(bytes32[] calldata _merkleProof) external {
        require(whitelistMinting, "Whitelist minting isn't allowed yet");
        require(totalSupply + 2 <= MAX_NUTS, "Purchase would exceed max supply");
        require(alreadyMinted[msg.sender] < 2, "User already minted 2!");

        bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
        require(MerkleProof.verify(_merkleProof, doubleMerkleRoot, leaf), "User not whitelisted for 2 mints");

        for (uint256 i = 0; i < 2; i++) {
            _safeMint(msg.sender, totalSupply + 1);
            totalSupply += 1;
        }  

        alreadyMinted[msg.sender] = 2;
        
    }

    function mintSingle(bytes32[] calldata _merkleProof) external {
        require(whitelistMinting, "Whitelist minting isn't allowed yet");
        require(totalSupply + 1 <= MAX_NUTS, "Purchase would exceed max supply");
        require(alreadyMinted[msg.sender] < 1, "User already minted 1!");

        bytes32 leaf = keccak256(abi.encodePacked(msg.sender));
        require(MerkleProof.verify(_merkleProof, singleMerkleRoot, leaf), "User not whitelisted for 1 mints");

        _safeMint(msg.sender, totalSupply + 1);
        totalSupply += 1;
        alreadyMinted[msg.sender] = 1;

        
    }

    function mint(address _address) public onlyOwner {
        require(totalSupply + 1 < MAX_NUTS, "All nuts have already been minted!");
        
        _safeMint(_address, totalSupply + 1);
        
        totalSupply += 1;
    }

    function tokenURI(uint256 tokenId) public view virtual override(ERC721) returns (string memory) {
        return string(abi.encodePacked(_baseURI(), uint2str(tokenId), ".json"));
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function _burn(uint256 tokenId) internal override(ERC721) {
        super._burn(tokenId);
    }

    function supportsInterface(bytes4 interfaceId) public view override(ERC721) returns (bool) {
        return super.supportsInterface(interfaceId);
    }

    function enableWhitelistMinting() external onlyOwner {
        whitelistMinting = true;
    }


    /**
     * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings.
     */
    function isApprovedForAll(address owner, address operator)
        override
        public
        view
        returns (bool)
    {
        // Whitelist OpenSea proxy contract for easy trading.
        ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
        if (address(proxyRegistry.proxies(owner)) == operator) {
            return true;
        }

        return super.isApprovedForAll(owner, operator);
    }

     /**
     * @dev override transfer to prevent transfer of calimed tokens
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev override transfer to prevent transfer of calimed tokens
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev override transfer to prevent transfer of calimed tokens
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }
    
    function uint2str(uint _i) internal pure returns (string memory _uintAsString) {
        if (_i == 0) {
            return "0";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len;
        while (_i != 0) {
            k = k-1;
            uint8 temp = (48 + uint8(_i - _i / 10 * 10));
            bytes1 b1 = bytes1(temp);
            bstr[k] = b1;
            _i /= 10;
        }
        return string(bstr);
    }
}