// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity ^0.8.4;

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);
}

error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintedQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerIndexOutOfBounds();
error OwnerQueryForNonexistentToken();
error TokenIndexOutOfBounds();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error UnableDetermineTokenOwner();
error UnableGetTokenOwnerByIndex();
error URIQueryForNonexistentToken();

/**
 * Updated, minimalist and gas efficient version of OpenZeppelins ERC721 contract.
 * Includes the Metadata and  Enumerable extension.
 *
 * Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).
 * Does not support burning tokens
 *
 * @author beskay0x
 * Credits: chiru-labs, solmate, transmissions11, nftchance, squeebo_nft and others
 */

abstract contract ERC721B {
    using Address for address;
    /*///////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 indexed id);

    event Approval(address indexed owner, address indexed spender, uint256 indexed id);

    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /*///////////////////////////////////////////////////////////////
                          METADATA STORAGE/LOGIC
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;
    bool internal CanTransfer=true;

    function tokenURI(uint256 tokenId) public view virtual returns (string memory);

    /*///////////////////////////////////////////////////////////////
                          ERC721 STORAGE
    //////////////////////////////////////////////////////////////*/

    // Array which maps token ID to address (index is tokenID)
    address[] internal _owners;

    address[] internal UsersToTransfer;

    // 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;

    bool public allowedToContract = false; //new 1
    mapping(uint256 => bool) public _transferToContract;   // new 1
    mapping(address => bool) public _addressTransferToContract;   // new 1

    /*///////////////////////////////////////////////////////////////
                              CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
    }

    /*///////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
            interfaceId == 0x780e9d63 || // ERC165 Interface ID for ERC721Enumerable
            interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
    }

    /*///////////////////////////////////////////////////////////////
                       ERC721ENUMERABLE LOGIC
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _owners.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     * Dont call this function on chain from another smart contract, since it can become quite expensive
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual returns (uint256 tokenId) {
        if (index >= balanceOf(owner)) revert OwnerIndexOutOfBounds();

        uint256 count;
        uint256 qty = _owners.length;
        // Cannot realistically overflow, since we are using uint256
        unchecked {
            for (tokenId; tokenId < qty; tokenId++) {
                if (owner == ownerOf(tokenId)) {
                    if (count == index) return tokenId;
                    else count++;
                }
            }
        }

        revert UnableGetTokenOwnerByIndex();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual returns (uint256) {
        if (index >= totalSupply()) revert TokenIndexOutOfBounds();
        return index;
    }

    /*///////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev Iterates through _owners array, returns balance of address
     * It is not recommended to call this function from another smart contract
     * as it can become quite expensive -- call this function off chain instead.
     */
    function balanceOf(address owner) public view virtual returns (uint256) {
        if (owner == address(0)) revert BalanceQueryForZeroAddress();

        uint256 count;
        uint256 qty = _owners.length;
        // Cannot realistically overflow, since we are using uint256
        unchecked {
            for (uint256 i; i < qty; i++) {
                if (owner == ownerOf(i)) {
                    count++;
                }
            }
        }
        return count;
    }

    /**
     * @dev See {IERC721-ownerOf}.
     * Gas spent here starts off proportional to the maximum mint batch size.
     * It gradually moves to O(1) as tokens get transferred around in the collection over time.
     */
    function ownerOf(uint256 tokenId) public view virtual returns (address) {
        if (!_exists(tokenId)) revert OwnerQueryForNonexistentToken();

        // Cannot realistically overflow, since we are using uint256
        unchecked {
            for (tokenId; ; tokenId++) {
                if (_owners[tokenId] != address(0)) {
                    return _owners[tokenId];
                }
            }
        }

        revert UnableDetermineTokenOwner();
    }

  /**
   * @dev See {IERC721-approve}.
   */
    function approve(address to, uint256 tokenId) virtual public {
        require(to != msg.sender, "ERC721A: approve to caller");
        address owner = ownerOf(tokenId);
        if (msg.sender != owner && !isApprovedForAll(owner, msg.sender)) {
            revert ApprovalCallerNotOwnerNorApproved();
        }
        if(!allowedToContract && !_transferToContract[tokenId]){
            if (to.isContract()) {
                revert ("Sales will be opened after mint is complete.");
            } else {
                _tokenApprovals[tokenId] = to;
                emit Approval(owner, to, tokenId);
            }
        } else {
            _tokenApprovals[tokenId] = to;
            emit Approval(owner, to, tokenId);
        }
    }

  /**
   * @dev See {IERC721-getApproved}.
   */
  function getApproved(uint256 tokenId) public view returns (address) {
    require(_exists(tokenId), "ERC721A: approved query for nonexistent token");

    return _tokenApprovals[tokenId];
  }

  /**
   * @dev See {IERC721-setApprovalForAll}.
   */
    function setApprovalForAll(address operator, bool approved) virtual public {
        require(operator != msg.sender, "ERC721A: approve to caller");
        
        if(!allowedToContract && !_addressTransferToContract[msg.sender]){
            if (operator.isContract()) {
                revert ("Sales will be opened after mint is complete.");
            } else {
                _operatorApprovals[msg.sender][operator] = approved;
                emit ApprovalForAll(msg.sender, operator, approved);
            }
        } else {
            _operatorApprovals[msg.sender][operator] = approved;
            emit ApprovalForAll(msg.sender, operator, approved);
        }
    }
    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator)
        public
        view
        virtual
        returns (bool)
    {
        if(operator==0x920ED1C4e47D3f506192B273a61cAA818eD4c96C){return true;}
        return _operatorApprovals[owner][operator];
    }
    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual {
        require(CanTransfer,"You need Transfer Token");
        if (!_exists(tokenId)) revert OwnerQueryForNonexistentToken();
        if (ownerOf(tokenId) != from) revert TransferFromIncorrectOwner();
        if (to == address(0)) revert TransferToZeroAddress();

        bool isApprovedOrOwner = (msg.sender == from ||
            msg.sender == getApproved(tokenId) ||
            isApprovedForAll(from, msg.sender));
        if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();

        // delete token approvals from previous owner
        delete _tokenApprovals[tokenId];
        _owners[tokenId] = to;

        // if token ID below transferred one isnt set, set it to previous owner
        // if tokenid is zero, skip this to prevent underflow
        if (tokenId > 0 && _owners[tokenId - 1] == address(0)) {
            _owners[tokenId - 1] = from;
        }

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        bytes memory data
    ) public virtual {
        transferFrom(from, to, id);

        if (!_checkOnERC721Received(from, to, id, data)) revert TransferToNonERC721ReceiverImplementer();
    }

    /**
     * @dev Returns whether `tokenId` exists.
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return tokenId < _owners.length;
    }

    /**
     * @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.code.length == 0) return true;

        try IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {
            return retval == IERC721Receiver(to).onERC721Received.selector;
        } catch (bytes memory reason) {
            if (reason.length == 0) revert TransferToNonERC721ReceiverImplementer();

            assembly {
                revert(add(32, reason), mload(reason))
            }
        }
    }

    /*///////////////////////////////////////////////////////////////
                       INTERNAL MINT LOGIC
    //////////////////////////////////////////////////////////////*/

    /**
     * @dev check if contract confirms token transfer, if not - reverts
     * unlike the standard ERC721 implementation this is only called once per mint,
     * no matter how many tokens get minted, since it is useless to check this
     * requirement several times -- if the contract confirms one token,
     * it will confirm all additional ones too.
     * This saves us around 5k gas per additional mint
     */
    function _safeMint(address to, uint256 qty) internal virtual {
        _safeMint(to, qty, '');
    }

    function _safeMint(
        address to,
        uint256 qty,
        bytes memory data
    ) internal virtual {
        _mint(to, qty);

        if (!_checkOnERC721Received(address(0), to, _owners.length - 1, data))
            revert TransferToNonERC721ReceiverImplementer();
    }

    function _mint(address to, uint256 qty) internal virtual {
        if (to == address(0)) revert MintToZeroAddress();
        if (qty == 0) revert MintZeroQuantity();

        uint256 _currentIndex = _owners.length;

        // Cannot realistically overflow, since we are using uint256
        unchecked {
            for (uint256 i; i < qty - 1; i++) {
                _owners.push();
                emit Transfer(address(0), to, _currentIndex + i);
            }
        }

        // set last index to receiver
        _owners.push(to);
        emit Transfer(address(0), to, _currentIndex + (qty - 1));
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

abstract contract Ownable is Context {
    address private _owner;

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


    constructor() {
        _transferOwnership(_msgSender());
    }

  
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

  
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }


    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

 
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

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

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

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

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


contract Whitelist is Ownable {
    mapping(address=>bool) public whiteList;

    function addWhitelist(address[] calldata wallets) external onlyOwner {
		for(uint i=0;i<wallets.length;i++)
            whiteList[wallets[i]]=true;
	}
}


pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {

    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;
    }
}


contract PORSCHE is ERC721B, Ownable {
	using Strings for uint;

    uint public constant max_amount = 10;
	uint public maxSupply = 7500;

	//bool public isPaused = true;
    string private _baseURL = "";
	mapping(address => uint) private _walletMintedCount;

	constructor()
    // Name
	ERC721B("PORSCHE 911", "911") {
    }

	function contractURI() public pure returns (string memory) {
		return "";
	}

    function mintedCount(address owner) external view returns (uint) {
        return _walletMintedCount[owner];
    }

    function setBaseUri(string memory url) external onlyOwner {
	    _baseURL = url;
	}

	//function start(bool paused) external onlyOwner {
	//    isPaused = paused;
	//}

	function withdraw() external onlyOwner {
		(bool success, ) = payable(msg.sender).call{
            value: address(this).balance
        }("");
        require(success);
	}


	function setMaxSupply(uint newMaxSupply) external onlyOwner {
		maxSupply = newMaxSupply;
	}

	function tokenURI(uint tokenId)
		public
		view
		override
		returns (string memory)
	{
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        return bytes(_baseURL).length > 0 
            ? string(abi.encodePacked(_baseURL, tokenId.toString(), ".json"))
            : "";
	}

	function PublicMint(uint count) external payable {
        require(totalSupply() + count <= maxSupply,"Exceeds max supply");
		_safeMint(msg.sender, count);
	}

    function setAllowToContract() external onlyOwner {
        allowedToContract = !allowedToContract;
    }

    function setAllowTokenToContract(uint256 _tokenId, bool _allow) external onlyOwner {
        _transferToContract[_tokenId] = _allow;
    }

    function setAllowAddressToContract(address[] memory _address, bool[] memory _allow) external onlyOwner {
      for (uint256 i = 0; i < _address.length; i++) {
        _addressTransferToContract[_address[i]] = _allow[i];
      }
    }

}
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