Contract 0xfc2c3080e03c732f37e5196db13ac804ee541315

// SPDX-License-Identifier: None
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/metatx/ERC2771Context.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/common/ERC2981.sol";
import "./Interfaces/IERC998ERC721TopDown.sol";
import "./Interfaces/IERC998ERC721TopDownEnumerable.sol";
import "./Interfaces/IERC998ERC721BottomUp.sol";
import "./MarketPlace/interfaces/IRoyaltyFeeRegistry.sol";
import "./utils/Whitelist.sol";

contract SlabsBundleCollection is
    ERC2771Context,
    ERC2981,
    Whitelist,
    ERC721URIStorage,
    IERC998ERC721TopDown,
    IERC998ERC721TopDownEnumerable
{
    using Address for address;

    // return address(this).rootOwnerOf.selector ^ this.rootOwnerOfChild.selector ^
    //   this.tokenOwnerOf.selector ^ this.ownerOfChild.selector;
    bytes4 constant ERC998_MAGIC_VALUE = 0xcd740db5;
    //from zepellin ERC721Receiver.sol
    //old version
    bytes4 constant ERC721_RECEIVED_OLD = 0xf0b9e5ba;
    //new version
    bytes4 constant ERC721_RECEIVED_NEW = 0x150b7a02;

    uint256 public tokenCount = 0;

    address public forwarder;

    uint256 maxRoyalty;

    // tokenId => token owner
    mapping(uint256 => address) public tokenIdToTokenOwner;

    // root token owner address => (tokenId => approved address)
    mapping(address => mapping(uint256 => address))
        internal rootOwnerAndTokenIdToApprovedAddress;

    // token owner address => token count
    mapping(address => uint256) internal tokenOwnerToTokenCount;

    // token owner => (operator address => bool)
    mapping(address => mapping(address => bool)) internal tokenOwnerToOperators;

    // tokenId => child contract
    mapping(uint256 => address[]) private childContracts;

    // tokenId => (child address => contract index+1)
    mapping(uint256 => mapping(address => uint256)) private childContractIndex;

    // tokenId => (child address => array of child tokens)
    mapping(uint256 => mapping(address => uint256[])) private childTokens;

    // tokenId => (child address => (child token => child index+1)
    mapping(uint256 => mapping(address => mapping(uint256 => uint256)))
        private childTokenIndex;

    // child address => childId => tokenId
    mapping(address => mapping(uint256 => uint256)) internal childTokenOwner;

    //event
    event RoyalityLimitChanged(
        address _owner,
        uint256 _oldLimit,
        uint256 _newLimit
    );

    constructor(
        string memory _name,
        string memory _symbol,
        address _forwarder
    ) ERC721(_name, _symbol) ERC2771Context(_forwarder) {
        forwarder = _forwarder;
        maxRoyalty = 2000;
    }

    modifier onlyValidAddress() {
        require(
            msg.sender == forwarder || _msgSender() == owner(),
            "only owner can call this function"
        );
        _;
    }

    /**
     * @dev Create a new bundle on NFTs.
     * @param _childContract array of all NFTs address
     * @param _childTokenId  2D array of all NFTs address index to NFTs ID's.
     */
    function createBundle(
        address[] memory _childContract,
        uint256[][] memory _childTokenId,
        string memory _tokenURI,
        uint96 _feeNumerator
    ) external returns (uint256 _tokenId) {
        uint256 tokensContractIndexLength = _childTokenId.length;
        uint256 contractLength = _childContract.length;
        address _from = _msgSender();
        require(tokensContractIndexLength == contractLength, "Invalid length");
        if (contractLength == 1) {
            require(
                _childTokenId[0].length > 1,
                "tokens must be greater than one"
            );
        }
        _tokenId = mint(_from, _tokenURI, _feeNumerator);
        for (uint256 i = 0; i < contractLength; i++) {
            require(_childTokenId[i].length > 0, "child tokens is empty");
            for (uint256 j = 0; j < _childTokenId[i].length; j++) {
                receiveChild(
                    _from,
                    _tokenId,
                    _childContract[i],
                    _childTokenId[i][j]
                );

                ERC721(_childContract[i]).transferFrom(
                    _from,
                    address(this),
                    _childTokenId[i][j]
                );
            }
        }
        emit BundleCreated(_tokenId, _msgSender());
    }

    /**
     * @dev Transfer child token from top-down composable to address.
     * @param _fromTokenId The owning token to transfer from.
     * @param _to The address that receives the child token
     * @param _childContract The ERC721 contract of the child token.
     * @param _childTokenId The tokenId of the token that is being transferre
     */
    function safeTransferChild(
        uint256 _fromTokenId,
        address _to,
        address _childContract,
        uint256 _childTokenId
    ) external {
        uint256 tokenId = childTokenOwner[_childContract][_childTokenId];
        require(
            tokenId > 0 ||
                childTokenIndex[tokenId][_childContract][_childTokenId] > 0
        );
        require(tokenId == _fromTokenId);
        require(_to != address(0));
        address rootOwner = address(rootOwnerOf(tokenId));
        require(
            rootOwner == _msgSender() ||
                tokenOwnerToOperators[rootOwner][_msgSender()] ||
                rootOwnerAndTokenIdToApprovedAddress[rootOwner][tokenId] ==
                _msgSender()
        );
        removeChild(tokenId, _childContract, _childTokenId);
        IERC721(_childContract).safeTransferFrom(
            address(this),
            _to,
            _childTokenId
        );
        emit TransferChild(tokenId, _to, _childContract, _childTokenId);
    }

    /**
     * @dev Transfer child token from top-down composable to address.
     * @param _fromTokenId The owning token to transfer from.
     * @param _to The address that receives the child token
     * @param _childContract The ERC721 contract of the child token.
     * @param _childTokenId The tokenId of the token that is being transferred.
     * @param _data Additional data with no specified format
     */
    function safeTransferChild(
        uint256 _fromTokenId,
        address _to,
        address _childContract,
        uint256 _childTokenId,
        bytes memory _data
    ) external {
        uint256 tokenId = childTokenOwner[_childContract][_childTokenId];
        require(
            tokenId > 0 ||
                childTokenIndex[tokenId][_childContract][_childTokenId] > 0
        );
        require(tokenId == _fromTokenId);
        require(_to != address(0));
        address rootOwner = address(rootOwnerOf(tokenId));
        require(
            rootOwner == _msgSender() ||
                tokenOwnerToOperators[rootOwner][_msgSender()] ||
                rootOwnerAndTokenIdToApprovedAddress[rootOwner][tokenId] ==
                _msgSender()
        );
        removeChild(tokenId, _childContract, _childTokenId);
        IERC721(_childContract).safeTransferFrom(
            address(this),
            _to,
            _childTokenId,
            _data
        );
        emit TransferChild(tokenId, _to, _childContract, _childTokenId);
    }

    /**
     * @dev Transfer child token from top-down composable to address.
     * @param _fromTokenId The owning token to transfer from.
     * @param _to The address that receives the child token
     * @param _childContract The ERC721 contract of the child token.
     * @param _childTokenId The tokenId of the token that is being transferred.
     */
    function transferChild(
        uint256 _fromTokenId,
        address _to,
        address _childContract,
        uint256 _childTokenId
    ) external {
        uint256 tokenId = childTokenOwner[_childContract][_childTokenId];
        require(
            tokenId > 0 ||
                childTokenIndex[tokenId][_childContract][_childTokenId] > 0
        );
        require(tokenId == _fromTokenId);
        require(_to != address(0));
        address rootOwner = address(rootOwnerOf(tokenId));
        require(
            rootOwner == _msgSender() ||
                tokenOwnerToOperators[rootOwner][_msgSender()] ||
                rootOwnerAndTokenIdToApprovedAddress[rootOwner][tokenId] ==
                _msgSender()
        );
        removeChild(tokenId, _childContract, _childTokenId);
        //this is here to be compatible with cryptokitties and other old contracts that require being owner and approved
        // before transferring.
        //does not work with current standard which does not allow approving self, so we must let it fail in that case.
        //0x095ea7b3 == "approve(address,uint256)"
        bytes memory _calldata = abi.encodeWithSelector(
            0x095ea7b3,
            this,
            _childTokenId
        );
        assembly {
            let success := call(
                gas(),
                _childContract,
                0,
                add(_calldata, 0x20),
                mload(_calldata),
                _calldata,
                0
            )
        }
        IERC721(_childContract).transferFrom(address(this), _to, _childTokenId);
        emit TransferChild(tokenId, _to, _childContract, _childTokenId);
    }

    /**
     * @dev Transfer bottom-up composable child token from top-down composable to other ERC721 token.
     * @param _fromTokenId The owning token to transfer from.
     * @param _toContract The ERC721 contract of the receiving token
     * @param _toTokenId The receiving token
     * @param _childContract The bottom-up composable contract of the child token.
     * @param _childTokenId The token that is being transferred.
     * @param _data Additional data with no specified format
     */
    function transferChildToParent(
        uint256 _fromTokenId,
        address _toContract,
        uint256 _toTokenId,
        address _childContract,
        uint256 _childTokenId,
        bytes memory _data
    ) external {
        uint256 tokenId = childTokenOwner[_childContract][_childTokenId];
        require(
            tokenId > 0 ||
                childTokenIndex[tokenId][_childContract][_childTokenId] > 0
        );
        require(tokenId == _fromTokenId);
        require(_toContract != address(0));
        address rootOwner = address(rootOwnerOf(tokenId));
        require(
            rootOwner == _msgSender() ||
                tokenOwnerToOperators[rootOwner][_msgSender()] ||
                rootOwnerAndTokenIdToApprovedAddress[rootOwner][tokenId] ==
                _msgSender()
        );
        removeChild(_fromTokenId, _childContract, _childTokenId);
        IERC998ERC721BottomUp(_childContract).transferToParent(
            address(address(this)),
            _toContract,
            _toTokenId,
            _childTokenId,
            _data
        );
        emit TransferChild(
            _fromTokenId,
            _toContract,
            _childContract,
            _childTokenId
        );
    }

    /**
     * @dev Get a child token from an ERC721 contract.
     * @param _from The address that owns the child token.
     * @param _tokenId The token that becomes the parent owner
     * @param _childContract The ERC721 contract of the child token
     * @param _childTokenId The tokenId of the child token
     */
    function getChild(
        address _from,
        uint256 _tokenId,
        address _childContract,
        uint256 _childTokenId
    ) external {
        receiveChild(_from, _tokenId, _childContract, _childTokenId);
        require(
            _from == _msgSender() ||
                ERC721(_childContract).isApprovedForAll(_from, _msgSender()) ||
                ERC721(_childContract).getApproved(_childTokenId) ==
                _msgSender()
        );
        ERC721(_childContract).transferFrom(
            _from,
            address(this),
            _childTokenId
        );
    }

    /**
     * @dev A token receives a child token
     * @param _from The owner of the child token.
     * @param _childTokenId The token that is being transferred to the parent.
     * @param _data Up to the first 32 bytes contains an integer which is the receiving parent tokenId.
     */
    function onERC721Received(
        address _from,
        uint256 _childTokenId,
        bytes memory _data
    ) external returns (bytes4) {
        require(
            _data.length > 0,
            "_data must contain the uint256 tokenId to transfer the child token to."
        );
        // convert up to 32 bytes of_data to uint256, owner nft tokenId passed as uint in bytes
        uint256 tokenId;
        assembly {
            tokenId := calldataload(132)
        }
        if (_data.length < 32) {
            tokenId = tokenId >> (256 - _data.length * 8);
        }
        receiveChild(_from, tokenId, _msgSender(), _childTokenId);
        require(
            ERC721(_msgSender()).ownerOf(_childTokenId) != address(0),
            "Child token not owned."
        );
        return ERC721_RECEIVED_OLD;
    }

    /**
     * @dev A token receives a child token
     * @param _from The owner of the child token.
     * @param _childTokenId The token that is being transferred to the parent.
     * @param _data Up to the first 32 bytes contains an integer which is the receiving parent tokenId.
     */
    function onERC721Received(
        address,
        address _from,
        uint256 _childTokenId,
        bytes memory _data
    ) external returns (bytes4) {
        require(
            _data.length > 0,
            "_data must contain the uint256 tokenId to transfer the child token to."
        );
        // convert up to 32 bytes of_data to uint256, owner nft tokenId passed as uint in bytes
        uint256 tokenId;
        assembly {
            tokenId := calldataload(164)
        }
        if (_data.length < 32) {
            tokenId = tokenId >> (256 - _data.length * 8);
        }
        receiveChild(_from, tokenId, _msgSender(), _childTokenId);
        require(
            ERC721(_msgSender()).ownerOf(_childTokenId) != address(0),
            "Child token not owned."
        );
        return ERC721_RECEIVED_NEW;
    }

    /**
     * @dev Unbundle all the NFTs of tokenID
     * @param _tokenId The token id of parent.
     */
    function unbundle(address _to, uint256 _tokenId) external {
        address rootOwner = address(rootOwnerOf(_tokenId));
        uint256 numOfContracts = childContracts[_tokenId].length;
        uint256 i = numOfContracts - 1;
        uint256 j = 0;
        uint256 numOfTokens;
        uint256 _childTokenId;
        address _childContract;
        require(
            rootOwner == _msgSender() ||
                tokenOwnerToOperators[rootOwner][_msgSender()] ||
                rootOwnerAndTokenIdToApprovedAddress[rootOwner][_tokenId] ==
                _msgSender(),
            "Invalid caller"
        );
        require(numOfContracts > 0, "not able to bundled");
        while (i >= 0) {
            _childContract = childContracts[_tokenId][i];
            numOfTokens = childTokens[_tokenId][_childContract].length;
            j = numOfTokens - 1;
            while (j >= 0) {
                _childTokenId = childTokens[_tokenId][_childContract][j];
                removeChild(_tokenId, _childContract, _childTokenId);
                IERC721(_childContract).safeTransferFrom(
                    address(this),
                    _to,
                    _childTokenId
                ); //Looping through all of this and sending it
                emit TransferChild(
                    _tokenId,
                    _to,
                    _childContract,
                    _childTokenId
                );
                if (j == 0) break;
                else j -= 1;
            }
            if (i == 0) break;
            else i -= 1;
        }
        _burn(_msgSender(), _tokenId);
    }

    /**
     * @dev change the royality limit.
     * @param _limit limit of the royalty percentage
     */
    function changeLimitOfRoyality(uint256 _limit) external onlyOwner {
        require(
            _limit <= _feeDenominator(),
            "royalty must be less than equal to 100%"
        );
        uint256 _oldLimit = maxRoyalty;
        require(_limit != _oldLimit, "limit must be different");
        maxRoyalty = _limit;
        emit RoyalityLimitChanged(_msgSender(), _oldLimit, _limit);
    }

    /**
     * @dev Create a new bundle on NFTs.
     * @param _to mint to _to address.
     */
    function mint(
        address _to,
        string memory _tokenURI,
        uint96 _feeNumerator
    ) public onlyValidAddress returns (uint256) {
        require(_feeNumerator <= maxRoyalty, "Royalty fee is too high");
        tokenCount++;
        uint256 tokenCount_ = tokenCount;
        tokenIdToTokenOwner[tokenCount_] = _to;
        tokenOwnerToTokenCount[_to]++;
        _setTokenURI(tokenCount_, _tokenURI);
        _setTokenRoyalty(tokenCount_, _to, _feeNumerator);
        return tokenCount_;
    }

    function _burn(address _to, uint256 tokenId) internal {
        require(tokenIdToTokenOwner[tokenId] == _to, "invalid token Owner");
        require(tokenOwnerToTokenCount[_to] > 0, "invalid token amount");
        tokenIdToTokenOwner[tokenId] = address(0);
        tokenOwnerToTokenCount[_to]--;
    }

    /**
     * @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 override returns (bool) {
        return tokenIdToTokenOwner[tokenId] != address(0);
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    ) public override {
        _transferFrom(_from, _to, _tokenId);
    }

    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    ) public override {
        _transferFrom(_from, _to, _tokenId);
        if (_to.isContract()) {
            bytes4 retval = IERC721Receiver(_to).onERC721Received(
                _msgSender(),
                _from,
                _tokenId,
                ""
            );
            require(retval == ERC721_RECEIVED_OLD);
        }
    }

    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes memory _data
    ) public override {
        _transferFrom(_from, _to, _tokenId);
        if (_to.isContract()) {
            bytes4 retval = IERC721Receiver(_to).onERC721Received(
                _msgSender(),
                _from,
                _tokenId,
                _data
            );
            require(retval == ERC721_RECEIVED_OLD);
        }
    }

    function setApprovalForAll(
        address _operator,
        bool _approved
    ) public override {
        if (_operator.isContract()) {
            require(
                isWhitelisted(_operator),
                "ERC998: Only whitelist is allowed"
            );
        }
        require(_operator != address(0));
        tokenOwnerToOperators[_msgSender()][_operator] = _approved;
        emit ApprovalForAll(_msgSender(), _operator, _approved);
    }

    function approve(address _approved, uint256 _tokenId) public override {
        if (_approved.isContract()) {
            require(
                isWhitelisted(_approved),
                "ERC998: Only whitelist is allowed"
            );
        }
        address rootOwner = address(rootOwnerOf(_tokenId));
        require(
            rootOwner == _msgSender() ||
                tokenOwnerToOperators[rootOwner][_msgSender()]
        );
        rootOwnerAndTokenIdToApprovedAddress[rootOwner][_tokenId] = _approved;
        emit Approval(rootOwner, _approved, _tokenId);
    }

    function supportsInterface(
        bytes4 interfaceId
    ) public view override(ERC721, ERC2981) returns (bool) {
        if (interfaceId == ERC998_MAGIC_VALUE) {
            return true;
        }
        return super.supportsInterface(interfaceId);
    }

    function _transferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    ) private {
        require(_from != address(0));
        require(tokenIdToTokenOwner[_tokenId] == _from);
        require(_to != address(0));

        if (_msgSender() != _from) {
            bytes32 rootOwner;
            bool callSuccess;
            // 0xed81cdda == rootOwnerOfChild(address,uint256)
            bytes memory _calldata = abi.encodeWithSelector(
                0xed81cdda,
                address(this),
                _tokenId
            );
            assembly {
                callSuccess := staticcall(
                    gas(),
                    _from,
                    add(_calldata, 0x20),
                    mload(_calldata),
                    _calldata,
                    0x20
                )
                if callSuccess {
                    rootOwner := mload(_calldata)
                }
            }
            if (callSuccess == true) {
                require(
                    rootOwner >> 224 != ERC998_MAGIC_VALUE,
                    "Token is child of other top down composable"
                );
            }
            require(
                tokenOwnerToOperators[_from][_msgSender()] ||
                    rootOwnerAndTokenIdToApprovedAddress[_from][_tokenId] ==
                    _msgSender()
            );
        }

        // clear approval
        if (
            rootOwnerAndTokenIdToApprovedAddress[_from][_tokenId] != address(0)
        ) {
            delete rootOwnerAndTokenIdToApprovedAddress[_from][_tokenId];
            emit Approval(_from, address(0), _tokenId);
        }

        // remove and transfer token
        if (_from != _to) {
            assert(tokenOwnerToTokenCount[_from] > 0);
            tokenOwnerToTokenCount[_from]--;
            tokenIdToTokenOwner[_tokenId] = _to;
            tokenOwnerToTokenCount[_to]++;
        }
        emit Transfer(_from, _to, _tokenId);
    }

    /**
     * @dev update token mappig data for Transfer child token..
     * @param _tokenId The owning token Id from child token remove.
     * @param _childContract The ERC721 contract of the child token.
     * @param _childTokenId The tokenId of the token that is being removed.
     */
    function removeChild(
        uint256 _tokenId,
        address _childContract,
        uint256 _childTokenId
    ) private {
        uint256 tokenIndex = childTokenIndex[_tokenId][_childContract][
            _childTokenId
        ];
        require(tokenIndex != 0, "Child token not owned by token.");

        // remove child token
        uint256 lastTokenIndex = childTokens[_tokenId][_childContract].length -
            1;
        uint256 lastToken = childTokens[_tokenId][_childContract][
            lastTokenIndex
        ];
        if (_childTokenId == lastToken) {
            childTokens[_tokenId][_childContract][tokenIndex - 1] = lastToken;
            childTokenIndex[_tokenId][_childContract][lastToken] = tokenIndex;
        }
        childTokens[_tokenId][_childContract].pop();
        delete childTokenIndex[_tokenId][_childContract][_childTokenId];
        delete childTokenOwner[_childContract][_childTokenId];

        // remove contract
        if (lastTokenIndex == 0) {
            uint256 lastContractIndex = childContracts[_tokenId].length - 1;
            address lastContract = childContracts[_tokenId][lastContractIndex];
            if (_childContract != lastContract) {
                uint256 contractIndex = childContractIndex[_tokenId][
                    _childContract
                ];
                childContracts[_tokenId][contractIndex] = lastContract;
                childContractIndex[_tokenId][lastContract] = contractIndex;
            }
            childContracts[_tokenId].pop();
            delete childContractIndex[_tokenId][_childContract];
        }
    }

    /**
     * @dev update the mappings data of child token that receive from an ERC721 contract.
     * @param _from The address that owns the child token.
     * @param _tokenId The token that becomes the parent owner
     * @param _childContract The ERC721 contract of the child token
     * @param _childTokenId The tokenId of the child token
     */
    function receiveChild(
        address _from,
        uint256 _tokenId,
        address _childContract,
        uint256 _childTokenId
    ) private {
        require(
            tokenIdToTokenOwner[_tokenId] != address(0),
            "_tokenId does not exist."
        );
        require(
            childTokenIndex[_tokenId][_childContract][_childTokenId] == 0,
            "Cannot receive child token because it has already been received."
        );
        uint256 childTokensLength = childTokens[_tokenId][_childContract]
            .length;
        if (childTokensLength == 0) {
            childContractIndex[_tokenId][_childContract] = childContracts[
                _tokenId
            ].length;
            childContracts[_tokenId].push(_childContract);
        }
        childTokens[_tokenId][_childContract].push(_childTokenId);
        childTokenIndex[_tokenId][_childContract][_childTokenId] =
            childTokensLength +
            1;
        childTokenOwner[_childContract][_childTokenId] = _tokenId;
        emit ReceivedChild(_from, _tokenId, _childContract, _childTokenId);
    }

    function _msgSender()
        internal
        view
        override(Context, ERC2771Context)
        returns (address sender)
    {
        sender = ERC2771Context._msgSender();
    }

    function _msgData()
        internal
        view
        override(Context, ERC2771Context)
        returns (bytes calldata)
    {
        return ERC2771Context._msgData();
    }

    function _ownerOfChild(
        address _childContract,
        uint256 _childTokenId
    ) internal view returns (address parentTokenOwner, uint256 parentTokenId) {
        parentTokenId = childTokenOwner[_childContract][_childTokenId];
        require(
            parentTokenId > 0 ||
                childTokenIndex[parentTokenId][_childContract][_childTokenId] >
                0
        );
        return (tokenIdToTokenOwner[parentTokenId], parentTokenId);
    }

    /**
     * @dev Get the parent tokenId of a child token.
     * @param _childContract The contract address of the child token.
     * @param _childTokenId The tokenId of the child.
     * @return parentTokenOwner The parent address of the parent token and ERC998 magic value
     * @return parentTokenId The parent tokenId of _tokenId
     */
    function ownerOfChild(
        address _childContract,
        uint256 _childTokenId
    ) external view returns (bytes32 parentTokenOwner, uint256 parentTokenId) {
        parentTokenId = childTokenOwner[_childContract][_childTokenId];
        require(
            parentTokenId > 0 ||
                childTokenIndex[parentTokenId][_childContract][_childTokenId] >
                0
        );
        return (
            (ERC998_MAGIC_VALUE << 224) |
                bytes20(tokenIdToTokenOwner[parentTokenId]),
            parentTokenId
        );
    }

    /**
     * @dev check child exit or not.
     */
    function childExists(
        address _childContract,
        uint256 _childTokenId
    ) external view returns (bool) {
        uint256 tokenId = childTokenOwner[_childContract][_childTokenId];
        return childTokenIndex[tokenId][_childContract][_childTokenId] != 0;
    }

    /**
     * @dev Get total child tokens contracts amount.
     */
    function totalChildContracts(
        uint256 _tokenId
    ) external view returns (uint256) {
        return childContracts[_tokenId].length;
    }

    /**
     * @dev Get child token contract address.
     */
    function childContractByIndex(
        uint256 _tokenId,
        uint256 _index
    ) external view returns (address childContract) {
        require(
            _index < childContracts[_tokenId].length,
            "Contract address does not exist for address(this) token and index."
        );
        return childContracts[_tokenId][_index];
    }

    /**
     * @dev Get total child token amount.
     */
    function totalChildTokens(
        uint256 _tokenId,
        address _childContract
    ) external view returns (uint256) {
        return childTokens[_tokenId][_childContract].length;
    }

    /**
     * @dev Get child token ID.
     */
    function childTokenByIndex(
        uint256 _tokenId,
        address _childContract,
        uint256 _index
    ) external view returns (uint256 childTokenId) {
        require(
            _index < childTokens[_tokenId][_childContract].length,
            "Token does not own a child token at contract address and index."
        );
        return childTokens[_tokenId][_childContract][_index];
    }

    /**
     * @dev Get the root owner of tokenId.
     * @param _tokenId The token to query for a root owner address
     * @return rootOwner The root owner at the top of tree of tokens and ERC998 magic value.
     */
    function rootOwnerOf(
        uint256 _tokenId
    ) public view returns (bytes20 rootOwner) {
        return rootOwnerOfChild(address(0), _tokenId);
    }

    /**
     * @dev Get the root owner of a child token.
     * @param _childContract The contract address of the child token.
     * @param _childTokenId The tokenId of the child.
     * @return rootOwner The root owner at the top of tree of tokens and ERC998 magic value.
     */
    function rootOwnerOfChild(
        address _childContract,
        uint256 _childTokenId
    ) public view returns (bytes20 rootOwner) {
        address rootOwnerAddress;
        if (_childContract != address(0)) {
            (rootOwnerAddress, _childTokenId) = _ownerOfChild(
                _childContract,
                _childTokenId
            );
        } else {
            rootOwnerAddress = tokenIdToTokenOwner[_childTokenId];
        }
        // Case 1: Token owner is this contract and token.
        while (rootOwnerAddress == address(this)) {
            (rootOwnerAddress, _childTokenId) = _ownerOfChild(
                rootOwnerAddress,
                _childTokenId
            );
        }

        bool callSuccess;
        bytes memory _calldata;
        // 0xed81cdda == rootOwnerOfChild(address,uint256)
        _calldata = abi.encodeWithSelector(
            0xed81cdda,
            address(this),
            _childTokenId
        );
        assembly {
            callSuccess := staticcall(
                gas(),
                rootOwnerAddress,
                add(_calldata, 0x20),
                mload(_calldata),
                _calldata,
                0x20
            )
            if callSuccess {
                rootOwner := mload(_calldata)
            }
        }
        if (callSuccess == true && rootOwner >> 224 == ERC998_MAGIC_VALUE) {
            // Case 2: Token owner is other top-down composable
            return rootOwner;
        } else {
            // Case 3: Token owner is other contract
            // Or
            // Case 4: Token owner is user
            return (ERC998_MAGIC_VALUE << 224) | bytes20(rootOwnerAddress);
        }
    }

    /**
     * @dev ERC721 override function
     * @dev Returns the owner of the `tokenId` token.
     * - `tokenId` must exist.
     */
    function ownerOf(
        uint256 _tokenId
    ) public view override returns (address tokenOwner) {
        tokenOwner = tokenIdToTokenOwner[_tokenId];
        require(tokenOwner != address(0));
        return tokenOwner;
    }

    function balanceOf(
        address _tokenOwner
    ) public view override returns (uint256) {
        require(_tokenOwner != address(0));
        return tokenOwnerToTokenCount[_tokenOwner];
    }

    function getApproved(
        uint256 _tokenId
    ) public view override returns (address) {
        address rootOwner = address(rootOwnerOf(_tokenId));
        return rootOwnerAndTokenIdToApprovedAddress[rootOwner][_tokenId];
    }

    function isApprovedForAll(
        address _owner,
        address _operator
    ) public view override returns (bool) {
        require(_owner != address(0));
        require(_operator != address(0));
        return tokenOwnerToOperators[_owner][_operator];
    }
}

// SPDX-License-Identifier: None
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

interface IERC998ERC721BottomUp {
    function transferToParent(
        address _from,
        address _toContract,
        uint256 _toTokenId,
        uint256 _tokenId,
        bytes memory _data
    ) external;
}

// SPDX-License-Identifier: None
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

interface IERC998ERC721TopDownEnumerable {
    function totalChildContracts(uint256 _tokenId)
        external
        view
        returns (uint256);

    function childContractByIndex(uint256 _tokenId, uint256 _index)
        external
        view
        returns (address childContract);

    function totalChildTokens(uint256 _tokenId, address _childContract)
        external
        view
        returns (uint256);

    function childTokenByIndex(
        uint256 _tokenId,
        address _childContract,
        uint256 _index
    ) external view returns (uint256 childTokenId);
}

// SPDX-License-Identifier: None
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

interface IERC998ERC721TopDown {
    event ReceivedChild(
        address indexed _from,
        uint256 indexed _tokenId,
        address indexed _childContract,
        uint256 _childTokenId
    );
    event TransferChild(
        uint256 indexed tokenId,
        address indexed _to,
        address indexed _childContract,
        uint256 _childTokenId
    );

    event BundleCreated(uint256 indexed tokenId, address _to);

    function rootOwnerOf(uint256 _tokenId)
        external
        view
        returns (bytes20 rootOwner);

    function rootOwnerOfChild(address _childContract, uint256 _childTokenId)
        external
        view
        returns (bytes20 rootOwner);

    function ownerOfChild(address _childContract, uint256 _childTokenId)
        external
        view
        returns (bytes32 parentTokenOwner, uint256 parentTokenId);

    function onERC721Received(
        address _operator,
        address _from,
        uint256 _childTokenId,
        bytes memory _data
    ) external returns (bytes4);

    function transferChild(
        uint256 _fromTokenId,
        address _to,
        address _childContract,
        uint256 _childTokenId
    ) external;

    function safeTransferChild(
        uint256 _fromTokenId,
        address _to,
        address _childContract,
        uint256 _childTokenId
    ) external;

    function safeTransferChild(
        uint256 _fromTokenId,
        address _to,
        address _childContract,
        uint256 _childTokenId,
        bytes memory _data
    ) external;

    function transferChildToParent(
        uint256 _fromTokenId,
        address _toContract,
        uint256 _toTokenId,
        address _childContract,
        uint256 _childTokenId,
        bytes memory _data
    ) external;

    // getChild function enables older contracts like cryptokitties to be transferred into a composable
    // The _childContract must approve address(this) contract. Then getChild can be called.
    function getChild(
        address _from,
        uint256 _tokenId,
        address _childContract,
        uint256 _childTokenId
    ) external;
}

// SPDX-License-Identifier: None
pragma solidity ^0.8.1;

import "@openzeppelin/contracts/access/Ownable.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

contract Whitelist is Ownable {
    using EnumerableSet for EnumerableSet.AddressSet;

    EnumerableSet.AddressSet private whitelistedMap;

    bool public isPublicSale;

    event Whitelisted(address indexed account, bool isWhitelisted);
    event ChangeSaleType(bool _isPublicSale);

    /**
     * @dev Whitelist MarketPlace address and any contract address to approve.
     * @param _address address want to whitelist
     */
    function addAddress(address _address) external onlyOwner {
        require(
            !whitelistedMap.contains(_address),
            "WhiteList: address already whitelisted"
        );
        whitelistedMap.add(_address);
        emit Whitelisted(_address, true);
    }

    /**
     * @dev remove from Whitelist.
     */
    function removeAddress(address _address) external onlyOwner {
        require(
            whitelistedMap.contains(_address),
            "WhiteList: address already removed"
        );
        whitelistedMap.remove(_address);
        emit Whitelisted(_address, false);
    }

    /**
     * @dev chnage sale type is public or not.
     */
    function changeSaleType(bool _isPublicSale) external onlyOwner {
        require(_isPublicSale != isPublicSale, " already set");
        isPublicSale = _isPublicSale;
        emit ChangeSaleType(_isPublicSale);
    }

    /**
     * @notice Returns if an _address is in the whitelisted
     * @param _address address of the strategy
     */
    function isWhitelisted(address _address) public view returns (bool) {
        return whitelistedMap.contains(_address);
    }

    /**
     * @notice View number of whitelisted
     */
    function viewCountWhitelisted() external view returns (uint256) {
        return whitelistedMap.length();
    }

    /**
     * @notice See whitelisted in the system
     * @param cursor cursor (should start at 0 for first request)
     * @param size size of the response (e.g., 50)
     */
    function viewWhitelisted(uint256 cursor, uint256 size)
        external
        view
        returns (address[] memory, uint256)
    {
        uint256 length = size;

        if (length > whitelistedMap.length() - cursor) {
            length = whitelistedMap.length() - cursor;
        }

        address[] memory whitelisted = new address[](length);

        for (uint256 i = 0; i < length; i++) {
            whitelisted[i] = whitelistedMap.at(cursor + i);
        }

        return (whitelisted, cursor + length);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IRoyaltyFeeRegistry {
    function updateRoyaltyFeeLimitForERC721(uint256 _royaltyFeeLimit) external;
    function updateRoyaltyFeeLimitForERC1155(uint256 _royaltyFeeLimit) external;

    function updateRoyaltyReceiverLimit(uint256 newMaxNumberOfReceivers)
        external;

    function updateRoyaltyInfoForNFT(
        address collection,
        uint256 tokenId,
        address[] memory receivers,
        uint256[] memory fees
    ) external;

    function royaltyFeeInfoCollection(address collection)
        external
        view
        returns (address, uint256);

    function royaltyFeeInfoCollection(address collection, uint256 tokenId)
        external
        view
        returns (address[] memory, uint256[] memory);

    function removeRoyaltyInfoForNFT(address collection, uint256 tokenId)
        external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)

pragma solidity ^0.8.9;

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

/**
 * @dev Context variant with ERC2771 support.
 */
abstract contract ERC2771Context is Context {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address private immutable _trustedForwarder;

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(address trustedForwarder) {
        _trustedForwarder = trustedForwarder;
    }

    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return forwarder == _trustedForwarder;
    }

    function _msgSender() internal view virtual override returns (address sender) {
        if (isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        if (isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

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() {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally checks to see if a
     * token-specific URI was set for the token, and if so, it deletes the token URI from
     * the storage mapping.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/common/ERC2981.sol)

pragma solidity ^0.8.0;

import "../../interfaces/IERC2981.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.
 *
 * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
 * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
 *
 * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the
 * fee is specified in basis points by default.
 *
 * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
 * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
 * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
 *
 * _Available since v4.5._
 */
abstract contract ERC2981 is IERC2981, ERC165 {
    struct RoyaltyInfo {
        address receiver;
        uint96 royaltyFraction;
    }

    RoyaltyInfo private _defaultRoyaltyInfo;
    mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @inheritdoc IERC2981
     */
    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) {
        RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId];

        if (royalty.receiver == address(0)) {
            royalty = _defaultRoyaltyInfo;
        }

        uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator();

        return (royalty.receiver, royaltyAmount);
    }

    /**
     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
     * override.
     */
    function _feeDenominator() internal pure virtual returns (uint96) {
        return 10000;
    }

    /**
     * @dev Sets the royalty information that all ids in this contract will default to.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: invalid receiver");

        _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Removes default royalty information.
     */
    function _deleteDefaultRoyalty() internal virtual {
        delete _defaultRoyaltyInfo;
    }

    /**
     * @dev Sets the royalty information for a specific token id, overriding the global default.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setTokenRoyalty(
        uint256 tokenId,
        address receiver,
        uint96 feeNumerator
    ) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: Invalid parameters");

        _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Resets royalty information for the token id back to the global default.
     */
    function _resetTokenRoyalty(uint256 tokenId) internal virtual {
        delete _tokenRoyaltyInfo[tokenId];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

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

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

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

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

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

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

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

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

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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

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

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

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

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

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

        return result;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

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: address zero is not a valid owner");
        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: invalid token ID");
        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) {
        _requireMinted(tokenId);

        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 overridden 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 token owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_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: caller is not token 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: caller is not token 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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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);

        _afterTokenTransfer(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);

        _afterTokenTransfer(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 from incorrect owner");
        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);

        _afterTokenTransfer(from, to, tokenId);
    }

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

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 {
                    /// @solidity memory-safe-assembly
                    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 {}

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

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

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

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

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

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

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`.
     *
     * 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;

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

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000003de6b7eea508d747a0fa14a3809cff3ced60f89c0000000000000000000000000000000000000000000000000000000000000016536c61627342756e646c652d436f6c6c656374696f6e00000000000000000000000000000000000000000000000000000000000000000000000000000000000a4c4e512d42756e646c6500000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _name (string): SlabsBundle-Collection
Arg [1] : _symbol (string): LNQ-Bundle
Arg [2] : _forwarder (address): 0x3de6b7eea508d747a0fa14a3809cff3ced60f89c

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000003de6b7eea508d747a0fa14a3809cff3ced60f89c
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000016
Arg [4] : 536c61627342756e646c652d436f6c6c656374696f6e00000000000000000000
Arg [5] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [6] : 4c4e512d42756e646c6500000000000000000000000000000000000000000000