// File: /contracts/DebtCity.sol



// contracts/DebtCity.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./@rarible/royalties/contracts/impl/RoyaltiesV2Impl.sol";
import "./@rarible/royalties/contracts/LibPart.sol";
import "./@rarible/royalties/contracts/LibRoyaltiesV2.sol";
import "./IPaper.sol";
import "./DebtCityLibrary.sol";



contract DebtCity is ERC721Enumerable, Ownable, RoyaltiesV2Impl {


/*



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██╔══██╗██╔════╝██╔══██╗╚══██╔══╝██╔══██╗██║╚══██╔══╝╚██╗░██╔╝
██║░░██║█████╗░░██████╦╝░░░██║░░░██║░░╚═╝██║░░░██║░░░░╚████╔╝░
██║░░██║██╔══╝░░██╔══██╗░░░██║░░░██║░░██╗██║░░░██║░░░░░╚██╔╝░░
██████╔╝███████╗██████╦╝░░░██║░░░╚█████╔╝██║░░░██║░░░░░░██║░░░
╚═════╝░╚══════╝╚═════╝░░░░╚═╝░░░░╚════╝░╚═╝░░░╚═╝░░░░░░╚═╝░░░    



*/


    using DebtCityLibrary for uint8;

    mapping(string => bool) hashToMinted;
    mapping(uint256 => string) internal bankerIdToHash;

    uint256 MAX_SUPPLY = 4999;
    uint256 SEED_NONCE = 0;

    uint256 REMAINING_BOARD_MEMBERS = 25;
    uint256 REMAINING_DIRECTORS = 200;
    uint256 REMAINING_VPS = 800;
    uint256 REMAINING_ASSOCIATES = 1500;
    uint256 REMAINING_ANALYSTS = 2474;

    mapping(address => uint8) private _allowList;
    bool isAllowListActive = true;
    bool isMintActive = false;
    address payable public payableWallet;
    bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;

    uint256 public ethPrice = 0.079 ether;
    uint8 maxPerWallet = 2;

    struct PngTrait {
        string ttype;
        string name;
        string png;
        bool on;
    }

    mapping(uint8 => mapping(uint8 => PngTrait)) public traitData;
    uint16[][15] TIERS;

    string[] LETTERS = [
        "a",
        "b",
        "c",
        "d",
        "e",
        "f",
        "g",
        "h",
        "i",
        "j",
        "k",
        "l",
        "m",
        "n",
        "o",
        "p",
        "q",
        "r",
        "s",
        "t",
        "u",
        "v",
        "w",
        "x",
        "y",
        "z"
    ];

    address paperAddress;
    address _owner;

    constructor() ERC721("DebtCity", "BANKERS") {
        _owner = msg.sender;
        payableWallet = payable(address(0xBC590a5370cc163023cdC17e041967796174081B));

        // 9 skin vals
        TIERS[0] = [20, 1110, 1110, 1110, 1110, 1110, 1110, 1110, 1110, 1100];
        // 9 eye vals
        TIERS[1] = [1120, 1110, 1110, 1110, 1110, 1110, 1110, 1110, 1110];
        // 4 mouth vals
        TIERS[2] = [2500, 2500, 2500, 2500];
        // 4 shoes vals
        TIERS[3] = [2500, 2500, 2500, 2500];
        // 4 pants vals
        TIERS[4] = [2500, 2500, 2500, 2500];
        // 8 dress shirt vals
        TIERS[5] = [1250, 1250, 1250, 1250, 1250, 1250, 1250, 1250];
        // 4 glasses vals
        TIERS[6] = [2500, 2500, 2500, 2500];
        // 10 t-shirt vals
        TIERS[7] = [1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000];
        // 10 polo vals
        TIERS[8] = [1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000];
        // 6 tie vals
        TIERS[9] = [1675, 1665, 1665, 1665, 1665, 1665];
        // 7 vest vals
        TIERS[10] = [1432, 1428, 1428, 1428, 1428, 1428, 1428];
        // 5 jacket vals
        TIERS[11] = [2000, 2000, 2000, 2000, 2000];
        // 6 pock square vals
        TIERS[12] = [1675, 1665, 1665, 1665, 1665, 1665];
        // 9 hair vals
        TIERS[13] = [1120, 1110, 1110, 1110, 1110, 1110, 1110, 1110, 1110];
        // 5 watch vals
        TIERS[14] = [2500, 2500, 2500, 1250, 1250];
    }



    /** *********************************** **/
    /** ********* Minting Functions ******* **/
    /** *********************************** **/


    function rarityGen(uint256 _randinput, uint8 _rarityTier)
        internal
        view
        returns (uint8)
    {
        uint16 currentLowerBound = 0;
        for (uint8 i = 0; i < TIERS[_rarityTier].length; i++) {
            uint16 thisPercentage = TIERS[_rarityTier][i];
            if (
                _randinput >= currentLowerBound &&
                _randinput < currentLowerBound + thisPercentage
            ) return i;
            currentLowerBound = currentLowerBound + thisPercentage;
        }

        revert();
    }

    
    function hash(
        uint256 _t,
        address _a,
        uint256 _c
    ) internal returns (string memory) {
        require(_c < 10);

        // This will generate a 16 character string
        // The last 15 digits are random, the first is 1-5 depending on the random
        // banker style assigned to the token

        string memory currentHash = "";
        SEED_NONCE++; 

        uint16 randValue = uint16(
            uint256(
                keccak256(
                    abi.encodePacked(
                        block.timestamp,
                        block.difficulty,
                        _t,
                        _a,
                        _c,
                        SEED_NONCE
                    )
                )
            ) 
        );

        uint8 bstyle = getBankerStyle(randValue); // get a random banker style
        currentHash = string(abi.encodePacked(currentHash, bstyle.toString()));

        uint8 pindex = 0;
        bool willForceNoPolo = false;

        for (uint8 i = 0; i < 15; i++) {
            SEED_NONCE++;
            uint16 _randinput = uint16(
                uint256(
                    keccak256(
                        abi.encodePacked(
                            block.timestamp,
                            block.difficulty,
                            _t,
                            _a,
                            _c,
                            SEED_NONCE
                        )
                    )
                ) % 10000
            );

            uint8 randDigit = rarityGen(_randinput, i);
            uint8 traitVal = applyBankerRules(i, bstyle, randDigit, _randinput);


            if (bstyle == 1 && i == 4) pindex = traitVal; // keep track of pants colors for members
            else if (bstyle == 1 && i == 12) traitVal = pindex + 1;

            if (i == 7 && traitVal != 0) willForceNoPolo = true;
            if (i == 8 && willForceNoPolo) traitVal = 0;

            currentHash = string(
                abi.encodePacked(currentHash, traitVal.toString())
            );
        } 

        if (hashToMinted[currentHash]) return hash(_t, _a, _c + 1);

        return currentHash;
    }


    function mintInternal(uint8 quantity) internal {

        uint256 _totalSupply = totalSupply();
        require(_totalSupply + quantity < MAX_SUPPLY);
        require(!DebtCityLibrary.isContract(msg.sender));
        require(msg.value == (ethPrice * quantity));
        require(
            balanceOf(msg.sender) + quantity <= maxPerWallet,
            "exceeds max per wallet"
        );

        uint8 i = 0;
        uint256 newBankerId = _totalSupply;
        while (i < quantity) {
            uint256 bankerId = newBankerId + i;
            bankerIdToHash[bankerId] = hash(bankerId, msg.sender, 0);
            hashToMinted[bankerIdToHash[bankerId]] = true;
            _safeMint(msg.sender, bankerId);
            i ++;
        }
    }

    function mintBanker(uint8 quantity) public {
        require(isAllowListActive == false, "Only the allow list can mint right now");
        return mintInternal(quantity);
    }


    function mintAllowList(uint8 quantity) external payable {

        require(isAllowListActive, "Allow list is not active");
        require(quantity <= _allowList[msg.sender], "Exceeded max available to purchase");

        _allowList[msg.sender] -= quantity;
        mintInternal(quantity);
     }


    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        // hardcode approval so that users don't have to waste gas approving
        if (_msgSender() != address(paperAddress)){
            require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        }
        _transfer(from, to, tokenId);
    }


    


    /** *********************************** **/
    /** ******* Internal Functions ******** **/
    /** *********************************** **/


    function applyBankerRules(uint8 i, uint8 bstyle, uint8 randDigit, uint16 bigRandom) pure internal returns (uint8) {

        if (i == 6 && bigRandom % 2 == 0) randDigit = 0;
        else if (i == 7 || i == 8) {
            if ((bstyle == 5 && bigRandom % 2 == 0) || bstyle < 5) randDigit = 0;
        } 
        else if (i == 9) {
            if (bstyle  == 5 || bstyle == 4 || (bstyle == 2 && bigRandom % 2 == 0)) randDigit = 0;
            if (bstyle == 3 && randDigit == 0) randDigit = 1;
        }
        else if (i == 10) {
            if (bstyle < 4 || bigRandom % 2 == 0) randDigit = 0;
        }
        else if (i == 11) {
            if (bstyle > 2) randDigit = 0;
        }
        else if (i == 12 && bstyle > 1) randDigit = 0;
        else if (i == 13 && bigRandom % 3 == 0) randDigit = 0;
        else if(i == 14 && (bigRandom % 2 == 0 || bstyle == 5)) randDigit = 0; 


        return randDigit;

    }
    



    function getBankerStyle(uint16 rando) internal returns (uint8) {     

        uint16 randVal = (rando & 0xFFFF);

        if (REMAINING_BOARD_MEMBERS > 0 && randVal % 200 == 0) { // ~0.5 % chance
            REMAINING_BOARD_MEMBERS--;
            return 1;
        }

        if (REMAINING_DIRECTORS > 0 && randVal % 25 == 0) { // ~4 % chance
            REMAINING_DIRECTORS--;
            return 2;
        }

        if (REMAINING_VPS > 0 && randVal % 6 == 0) { // ~16 % chance
            REMAINING_VPS--;
            return 3;
        }

        if (REMAINING_ASSOCIATES > 0 && randVal % 3 == 0) { // ~30 % chance
            REMAINING_ASSOCIATES--;
            return 4;
        } 

        if (REMAINING_ANALYSTS > 0) { // assign analyst if available
            REMAINING_ANALYSTS--;
            return 5;
        } 


        // else find the lowest ranking available banker type 
        uint8 res = getLowestType();
        return res;

    }


    function getLowestType() internal returns (uint8) {
        if (REMAINING_ANALYSTS > 0) {
            REMAINING_ANALYSTS--;
            return 5;
        }

        if (REMAINING_ASSOCIATES > 0) {
            REMAINING_ASSOCIATES--;
            return 4;
        }

        if (REMAINING_VPS > 0) {
            REMAINING_VPS--;
            return 3;
        }

        if (REMAINING_DIRECTORS > 0) {
            REMAINING_DIRECTORS--;
            return 2;
        }

        if (REMAINING_BOARD_MEMBERS > 0) {
            REMAINING_BOARD_MEMBERS--;
            return 1;
        }

        return 0;
    }  

    function getJobString(uint8 job) internal pure returns (string memory) {
        if (job == 5) return "analyst";
        else if (job == 4) return "associate";
        else if (job == 3) return "vice_president";
        else if (job == 2) return "director";
        else if (job == 1) return "board_member";
        return "none";
    }   




    /** *********************************** **/
    /** ********* Public Getters ********** **/
    /** *********************************** **/
    
    function getBankersRemaining() public view returns (uint256) {
        return (REMAINING_BOARD_MEMBERS + REMAINING_DIRECTORS + REMAINING_VPS + REMAINING_ASSOCIATES + REMAINING_ANALYSTS); 
    }


    function hashToMetadata(string memory _hash)
        public
        view
        returns (string memory)
    {
        uint8 job = DebtCityLibrary.parseInt(
            DebtCityLibrary.substring(_hash, 0, 1)
        );

        string memory metadataString = string(
            abi.encodePacked(
                '{"trait_type":"job_title","value":"',
                getJobString(job), '"},'
            )
        );

        for (uint8 i = 0; i < 15; i++) {
            uint8 hashIndex = i + 1;
            uint8 thisTraitIndex = DebtCityLibrary.parseInt(
                DebtCityLibrary.substring(_hash, hashIndex, hashIndex + 1)
            );

            PngTrait memory t = traitData[i][thisTraitIndex];

            if (t.on) {

                if (i != 0) metadataString = string(abi.encodePacked(metadataString, ","));

                metadataString = string(
                    abi.encodePacked(
                        metadataString,
                        '{"trait_type":"',
                        t.ttype,
                        '","value":"',
                        t.name,
                        '"}'
                    )
                );
            }
        }

        return string(abi.encodePacked("[", metadataString, "]"));
    }


    function tokenURI(uint256 _bankerId)
        public
        view
        override
        returns (string memory)
    {
        require(_exists(_bankerId));

        string memory bankerHash = _bankerIdToHash(_bankerId);

        return
            string(
                abi.encodePacked(
                    "data:application/json;base64,",
                    DebtCityLibrary.encode(
                        bytes(
                            string(
                                abi.encodePacked(
                                    '{"name": "DebtCity #',
                                    DebtCityLibrary.toString(_bankerId),
                                    '", "description": "DebtCity is the first on-chain economic simulator. No IPFS, no API. Just an Ethereum blockchain simulation of finance, investment, and degeneracy", "image": "data:image/svg+xml;base64,',
                                    DebtCityLibrary.encode(
                                        bytes(outputFullSVG(bankerHash))
                                    ),
                                    '","attributes":',
                                    hashToMetadata(bankerHash),
                                    "}"
                                )
                            )
                        )
                    )
                )
            );
    }


    function _bankerIdToHash(uint256 _bankerId)
        public
        view
        returns (string memory)
    {
        return bankerIdToHash[_bankerId];
    }


    function getPayForBanker(uint256 _bankerId)
        public
        view
        returns (uint8)
    {
        string memory bankerHash = bankerIdToHash[_bankerId];

        uint8 jobVal = DebtCityLibrary.parseInt(
            DebtCityLibrary.substring(bankerHash, 0, 1)
        );

        if (jobVal == 1) return 15;
        if (jobVal == 2) return 8;
        if (jobVal == 3) return 3;
        if (jobVal == 4) return 2;

        return 1;
    }


    function walletOfOwner(address _wallet)
        public
        view
        returns (uint256[] memory)
    {
        uint256 bankerCount = balanceOf(_wallet);

        uint256[] memory bankersId = new uint256[](bankerCount);
        for (uint256 i; i < bankerCount; i++) {
            bankersId[i] = tokenOfOwnerByIndex(_wallet, i);
        }
        return bankersId;
    }




    /** *********************************** **/
    /** ********* Owner Functions ********* **/
    /** *********************************** **/

    function clearTraits() public onlyOwner {
        for (uint8 i = 0; i < 15; i++) {
            for (uint8 j = 0; j < 15; j++) { 
                delete traitData[i][i];
            }
        }
    }
    

    function outputFullSVG(string memory _hash) public view returns (string memory) {
       
        string memory svgString = "";

        for (uint8 i = 0; i < 15; i++) {

            uint8 hashIndex = i + 1;
            uint8 thisTraitIndex = DebtCityLibrary.parseInt(
                DebtCityLibrary.substring(_hash, hashIndex, hashIndex + 1)
            );

            PngTrait memory t = traitData[i][thisTraitIndex];
            if (t.on) svgString = string(abi.encodePacked(svgString, drawTrait(t)));
        }

        return string(abi.encodePacked(
          '<svg id="banker" width="100%" height="100%" version="1.1" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">',
          svgString,
          "</svg>"
        ));
    }


    function drawTrait(PngTrait memory trait) internal pure returns (string memory) {
        return string(abi.encodePacked(
          '<image x="4" y="4" width="32" height="32" image-rendering="pixelated" preserveAspectRatio="xMidYMid" xlink:href="data:image/png;base64,',
          trait.png,
          '"/>'
        ));
    }


    function uploadTraits(uint8 traitType, PngTrait[] memory traits) public onlyOwner {
        for (uint8 i = 0; i < traits.length; i++) {
            traitData[traitType][i] = PngTrait(
                traits[i].ttype,
                traits[i].name,
                traits[i].png,
                traits[i].on
            );
        }
    }
   

    function setPaperAddress(address _paperAddress) public onlyOwner {
        paperAddress = _paperAddress;
    }

    function flipMintMode() public onlyOwner {
        isMintActive = !isMintActive;
    }

    function flipAllowMode() public onlyOwner {
        isAllowListActive = !isAllowListActive;
    }


    function setAllowList(address[] calldata addresses) external onlyOwner {
        for (uint256 i = 0; i < addresses.length; i++) {
            _allowList[addresses[i]] = 2;
        }
    }


    function setPayableWallet(address _payableWallet) external onlyOwner {
        payableWallet = payable(_payableWallet);
    }

    function withdraw() external onlyOwner {
        uint256 balance = address(this).balance;
        payable(payableWallet).transfer(balance);
    }



    /** *********************************** **/
    /** ******* Royalties Functions ******* **/
    /** *********************************** **/


    function setRoyalties(uint _tokenId, address payable _royaltiesRecipientAddress, uint96 _percentageBasisPoints) public onlyOwner {
        LibPart.Part[] memory _royalties = new LibPart.Part[](1);
        _royalties[0].value = _percentageBasisPoints;
        _royalties[0].account = _royaltiesRecipientAddress;
        _saveRoyalties(_tokenId, _royalties);
    }

    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) external view returns (address receiver,uint256 royaltyAmount) {

        LibPart.Part[] memory _royalties = royalties[_tokenId];
        if (_royalties.length > 0) {
            return (_royalties[0].account, (_salePrice * _royalties[0].value) / 10000);
        }
        return (address(0), 0);

    }

    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        if (interfaceId == LibRoyaltiesV2._INTERFACE_ID_ROYALTIES) {
            return true;
        }

        if (interfaceId == _INTERFACE_ID_ERC2981) {
            return true;
        }
        return super.supportsInterface(interfaceId);
    }
    

}

// File: /contracts/IPaper.sol



// contracts/IDebt.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";


interface IPaper is IERC20 {
    function burnFrom(address account, uint256 amount) external;
}

// File: /contracts/DebtCityLibrary.sol



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

library DebtCityLibrary {
    string internal constant TABLE =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    function encode(bytes memory data) internal pure returns (string memory) {
        if (data.length == 0) return "";
        string memory table = TABLE;
        uint256 encodedLen = 4 * ((data.length + 2) / 3);
        string memory result = new string(encodedLen + 32);

        assembly {
            mstore(result, encodedLen)
            let tablePtr := add(table, 1)
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))
            let resultPtr := add(result, 32)

            // loop over input 3 bytes at a time
            for {

            } lt(dataPtr, endPtr) {

            } {
                dataPtr := add(dataPtr, 3)

                let input := mload(dataPtr)

                mstore(
                    resultPtr,
                    shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                )
                resultPtr := add(resultPtr, 1)
                mstore(
                    resultPtr,
                    shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                )
                resultPtr := add(resultPtr, 1)
                mstore(
                    resultPtr,
                    shl(248, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                )
                resultPtr := add(resultPtr, 1)
                mstore(
                    resultPtr,
                    shl(248, mload(add(tablePtr, and(input, 0x3F))))
                )
                resultPtr := add(resultPtr, 1)
            }

            // padding with '='
            switch mod(mload(data), 3)
            case 1 {
                mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
            }
            case 2 {
                mstore(sub(resultPtr, 1), shl(248, 0x3d))
            }
        }

        return result;
    }

    function isContract(address account) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function parseInt(string memory _a)
        internal
        pure
        returns (uint8 _parsedInt)
    {
        bytes memory bresult = bytes(_a);
        uint8 mint = 0;
        for (uint8 i = 0; i < bresult.length; i++) {
            if (
                (uint8(uint8(bresult[i])) >= 48) &&
                (uint8(uint8(bresult[i])) <= 57)
            ) {
                mint *= 10;
                mint += uint8(bresult[i]) - 48;
            }
        }
        return mint;
    }

   
    function toString(uint256 value) internal pure returns (string memory) {
        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);
    }

    

    function substring(
        string memory str,
        uint256 startIndex,
        uint256 endIndex
    ) internal pure returns (string memory) {
        bytes memory strBytes = bytes(str);
        bytes memory result = new bytes(endIndex - startIndex);
        for (uint256 i = startIndex; i < endIndex; i++) {
            result[i - startIndex] = strBytes[i];
        }
        return string(result);
    }
}

// File: /contracts/@rarible/royalties/contracts/impl/RoyaltiesV2Impl.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./AbstractRoyalties.sol";
import "../RoyaltiesV2.sol";

contract RoyaltiesV2Impl is AbstractRoyalties, RoyaltiesV2 {

    function getRaribleV2Royalties(uint256 id) override external view returns (LibPart.Part[] memory) {
        return royalties[id];
    }

    function _onRoyaltiesSet(uint256 id, LibPart.Part[] memory _royalties) override internal {
        emit RoyaltiesSet(id, _royalties);
    }
}


// File: /contracts/@rarible/royalties/contracts/impl/AbstractRoyalties.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../LibPart.sol";

abstract contract AbstractRoyalties {
    mapping (uint256 => LibPart.Part[]) internal royalties;

    function _saveRoyalties(uint256 id, LibPart.Part[] memory _royalties) internal {
        uint256 totalValue;
        for (uint i = 0; i < _royalties.length; i++) {
            require(_royalties[i].account != address(0x0), "Recipient should be present");
            require(_royalties[i].value != 0, "Royalty value should be positive");
            totalValue += _royalties[i].value;
            royalties[id].push(_royalties[i]);
        }
        require(totalValue < 10000, "Royalty total value should be < 10000");
        _onRoyaltiesSet(id, _royalties);
    }

    function _updateAccount(uint256 _id, address _from, address _to) internal {
        uint length = royalties[_id].length;
        for(uint i = 0; i < length; i++) {
            if (royalties[_id][i].account == _from) {
                royalties[_id][i].account = payable(address(uint160(_to)));
            }
        }
    }

    function _onRoyaltiesSet(uint256 id, LibPart.Part[] memory _royalties) virtual internal;
}


// File: /contracts/@rarible/royalties/contracts/RoyaltiesV2.sol



pragma solidity ^0.8.0;
pragma abicoder v2;

import "./LibPart.sol";

interface RoyaltiesV2 {
    event RoyaltiesSet(uint256 tokenId, LibPart.Part[] royalties);

    function getRaribleV2Royalties(uint256 id) external view returns (LibPart.Part[] memory);
}

// File: /contracts/@rarible/royalties/contracts/LibRoyaltiesV2.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library LibRoyaltiesV2 {
    /*
     * bytes4(keccak256('getRaribleV2Royalties(uint256)')) == 0xcad96cca
     */
    bytes4 constant _INTERFACE_ID_ROYALTIES = 0xcad96cca;
}


// File: /contracts/@rarible/royalties/contracts/LibPart.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library LibPart {
    bytes32 public constant TYPE_HASH = keccak256("Part(address account,uint96 value)");

    struct Part {
        address payable account;
        uint96 value;
    }

    function hash(Part memory part) internal pure returns (bytes32) {
        return keccak256(abi.encode(TYPE_HASH, part.account, part.value));
    }
}


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



// 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);
}

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



// 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;
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

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



// 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;
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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

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

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



// 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);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

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

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @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` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * 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 override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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: balance query for the zero address");
        return _balances[owner];
    }

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _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: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @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 {}
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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