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// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.21;

pragma abicoder v2;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import { ZNSOracle } from "./ZNSOracle.sol";
import { ZNSGiftCard } from "./ZNSGiftCard.sol";

contract ZNSRegistry is
	ERC721URIStorage,
	Pausable,
	ReentrancyGuard,
	AccessControl
{
	using Strings for uint256;

	/*//////////////////////////////////////////////////////////////
                            INITIALIZATION
    //////////////////////////////////////////////////////////////*/
	uint256 public tokenID;

	bytes32 public constant MAINTAINER_ROLE = keccak256("MAINTAINER_ROLE");
	string public tld;

	string public baseUri;

	address[] profitSharingPartners = [
		0xD00c70F9b78C63a36519C488F862DF95b7A73d90
	];

	uint256[] profitSharesOfPartners = [10000];
	address public oracle;
	address public giftCard;

	struct RegistryData {
		address owner;
		string domainName;
		uint16 lengthOfDomain;
		uint256 expirationDate;
	}

	struct UserData {
		uint256[] ownedGiftCards;
		uint256 credits;
	}

	struct UserConfig {
		uint256 primaryDomain;
		uint256[] allOwnedDomains;
		uint256 numberOfReferrals;
		uint256 totalEarnings;
	}

	enum domainStatus {
		AVAILABLE,
		REGISTERED,
		EXPIRED
	}

	mapping(uint256 => RegistryData) internal registryLookup;
	mapping(address => UserConfig) internal userLookup;
	mapping(string => uint256) public domainLookup;
	mapping(uint256 => string) public idToDomain;
	mapping(string => bool) public protectedDomains;
	mapping(address => uint256) public partnerReferrals;
	mapping(uint256 => uint256) public mintToExpire;

	uint256[] public totalRegisteredDomains;

	uint256[5] internal domainPricing = [990e18, 490e18, 90e18, 20e18, 8e18];
	uint256[5] internal renewPricing = [99e18, 49e18, 9e18, 2e18, 8e17];

	// 1 invites - 5%
	// 10 invites - 10-%
	// 30 invites - 15%
	// 60 invites - 20%
	// 100 invites - 25%
	uint256[5] referTicks = [500, 1000, 1500, 2000, 2500];

	constructor(
		address _oracle,
		address _giftCard,
		string memory _symbol,
		string memory _tld
	) ERC721("ZNS Connect", _symbol) {
		tokenID++;
		_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
		_grantRole(MAINTAINER_ROLE, msg.sender);

		oracle = _oracle;
		giftCard = _giftCard;

		tld = _tld;

		baseUri = "https://api.znsconnect.io/v1/metadata";
	}

	/*//////////////////////////////////////////////////////////////
                            CUSTOM MODIFIERS
    //////////////////////////////////////////////////////////////*/

	modifier onlyMaintainer() {
		require(
			hasRole(MAINTAINER_ROLE, msg.sender),
			"maintainer role required"
		);
		_;
	}

	modifier onlyAdmin() {
		require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "admin role required");
		_;
	}

	/*//////////////////////////////////////////////////////////////
                            CUSTOM ERRORS
    //////////////////////////////////////////////////////////////*/

	error InvalidLength();
	error AlreadyRegistered();
	error SelfReferral();
	error DomainExpired();
	error NotRegistered();
	error cannotBeMoreThan100Percent();
	error InvalidAddress();
	error LengthsDoNotMatch();
	error NoCredits();
	error NotOwner();
	error NotEnoughCredits();
	error RefferalEarningCannotBeCalculated();
	error DomainNotExpired();
	error NotEnoughNativeTokenPaid();
	error DomainIn30dayPeriod();
	error PriceCannotBeZero();
	error DomainExpiredButNotBurned();
	error InvalidExpiry();
	error DomainIsProtected();
	error AmountMoreThanShare();
	error InvalidDomainName();

	/*//////////////////////////////////////////////////////////////
                            CUSTOM EVENTS
    //////////////////////////////////////////////////////////////*/

	event MintedDomain(
		string domainName,
		uint256 indexed tokenId,
		address indexed owner,
		uint256 indexed expiry
	);
	event PrimaryDomainSet(
		uint256 indexed tokenId,
		address indexed owner,
		string domainName
	);
	event RenewedDomain(
		uint256 indexed tokenId,
		uint256 indexed expiry,
		string domainName
	);
	event TransferredDomain(
		string domainName,
		uint256 indexed tokenId,
		address indexed from,
		address indexed to
	);

	/*//////////////////////////////////////////////////////////////
                            PUBLIC READ FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function registryLookupByName(
		string memory domainName
	) external view returns (RegistryData memory) {
		if (checkDomainStatus(domainLookup[domainName]) == domainStatus.EXPIRED)
			revert DomainExpired();
		return registryLookup[domainLookup[domainName]];
	}

	function registryLookupById(
		uint256 tokenId
	) external view returns (RegistryData memory) {
		if (checkDomainStatus(tokenId) == domainStatus.EXPIRED)
			revert DomainExpired();
		return registryLookup[tokenId];
	}

	function checkDomainStatus(
		uint256 tokenId
	) public view returns (domainStatus status) {
		RegistryData memory _registryData = registryLookup[tokenId];
		if (
			_registryData.owner == address(0) &&
			_registryData.expirationDate == 0 &&
			_registryData.lengthOfDomain == 0
		) return domainStatus.AVAILABLE;
		else if (
			_registryData.owner != address(0) &&
			_registryData.expirationDate > block.timestamp
		) return domainStatus.REGISTERED;
		else if (
			_registryData.owner != address(0) &&
			_registryData.expirationDate < block.timestamp
		) return domainStatus.EXPIRED;
	}

	function priceToRegister(uint16 len) public view returns (uint256) {
		uint256 currentUSDPrice = getOraclePrice();
		if (len <= 0 || len > 24) revert InvalidLength();
		if (len == 1) return (domainPricing[0] * 1e18) / currentUSDPrice;
		else if (len == 2) return (domainPricing[1] * 1e18) / currentUSDPrice;
		else if (len == 3) return (domainPricing[2] * 1e18) / currentUSDPrice;
		else if (len == 4) return (domainPricing[3] * 1e18) / currentUSDPrice;
		else if (len >= 5 && len <= 24)
			return (domainPricing[4] * 1e18) / currentUSDPrice;
		else revert InvalidLength();
	}

	function priceToRenew(uint16 len) public view returns (uint256) {
		uint256 currentUSDPrice = getOraclePrice();
		if (len <= 0 || len > 24) revert InvalidLength();

		if (len == 1) return (renewPricing[0] * 1e18) / currentUSDPrice;
		else if (len == 2) return (renewPricing[1] * 1e18) / currentUSDPrice;
		else if (len == 3) return (renewPricing[2] * 1e18) / currentUSDPrice;
		else if (len == 4) return (renewPricing[3] * 1e18) / currentUSDPrice;
		else if (len >= 5 && len <= 24)
			return (renewPricing[4] * 1e18) / currentUSDPrice;
		else revert InvalidLength();
	}

	function userLookupByAddress(
		address user
	) external view returns (UserConfig memory) {
		return userLookup[user];
	}

	function getOraclePrice() public view returns (uint256) {
		return ZNSOracle(oracle).priceToUSD();
	}

	function getTotalRegisteredDomains()
		external
		view
		returns (uint256[] memory)
	{
		return totalRegisteredDomains;
	}

	/*//////////////////////////////////////////////////////////////
                            ADMIN WRITE FUNCTIONS
    //////////////////////////////////////////////////////////////*/
	function setPartnerReferral(
		address referral,
		uint sharePercent
	) public onlyAdmin nonReentrant whenNotPaused {
		if (sharePercent > 10000) {
			revert cannotBeMoreThan100Percent();
		}
		partnerReferrals[referral] = sharePercent;
	}

	function setProfitSharingData(
		address[] memory _partners,
		uint256[] memory _percentages
	) public onlyAdmin nonReentrant whenNotPaused {
		if (_partners.length != _percentages.length) {
			revert LengthsDoNotMatch();
		}
		uint256 sum;
		for (uint256 i = 0; i < _percentages.length; i++) {
			sum += _percentages[i];
			if (isInvalidAddress(_partners[i])) revert InvalidAddress();
		}
		if (sum > 10000) {
			revert cannotBeMoreThan100Percent();
		}
		profitSharingPartners = _partners;
		profitSharesOfPartners = _percentages;
	}

	function setOracle(address _oracleAddress) public onlyAdmin nonReentrant {
		if (isInvalidAddress(_oracleAddress)) revert InvalidAddress();
		oracle = _oracleAddress;
	}

	function setGiftCard(
		address _giftCardAddress
	) public onlyAdmin nonReentrant {
		if (isInvalidAddress(_giftCardAddress)) revert InvalidAddress();
		giftCard = _giftCardAddress;
	}

	function setReferTicks(
		uint256[5] memory _ticks
	) public onlyAdmin nonReentrant whenNotPaused {
		for (uint256 i = 0; i < 5; i++) {
			if (_ticks[i] > 10000) {
				revert cannotBeMoreThan100Percent();
			}
		}
		referTicks = _ticks;
	}

	function setDomainPricing(
		uint256[5] memory _domainPricing
	) external onlyAdmin nonReentrant whenNotPaused {
		if (_domainPricing.length != 5) revert InvalidLength();
		for (uint256 i = 0; i < _domainPricing.length; i++) {
			if (_domainPricing[i] == 0) revert PriceCannotBeZero();
		}
		domainPricing = _domainPricing;
	}

	function setRenewPricing(
		uint256[5] memory _renewPricing
	) external onlyAdmin nonReentrant {
		if (_renewPricing.length != 5) revert InvalidLength();
		for (uint256 i = 0; i < _renewPricing.length; i++) {
			if (_renewPricing[i] == 0) revert PriceCannotBeZero();
		}
		renewPricing = _renewPricing;
	}

	function adminWithdraw() public onlyAdmin nonReentrant {
		payable(msg.sender).transfer(address(this).balance);
	}

	function adminRegisterDomains(
		address[] memory owners,
		string[] memory domainNames,
		uint256[] memory expiries
	) public onlyAdmin nonReentrant whenNotPaused {
		uint16[] memory lengthsOfDomains = new uint16[](domainNames.length);

		for (uint256 i = 0; i < domainNames.length; i++) {
			uint16 lengthOfDomain = uint16(strlen(domainNames[i]));
			lengthsOfDomains[i] = lengthOfDomain;
		}

		mintDomains(owners, domainNames, lengthsOfDomains, expiries);
	}

	function pause() external onlyAdmin nonReentrant {
		_pause();
	}

	function unpause() external onlyAdmin nonReentrant {
		_unpause();
	}

	function protectDomains(
		string[] memory domainNames,
		bool[] memory isProtectedValues
	) external onlyAdmin nonReentrant whenNotPaused {
		if (domainNames.length != isProtectedValues.length) {
			revert LengthsDoNotMatch();
		}
		for (uint256 i = 0; i < domainNames.length; i++) {
			protectedDomains[domainNames[i]] = isProtectedValues[i];
		}
	}

	function burnExpiredDomains(
		uint256[] memory tokenIds
	) external onlyMaintainer nonReentrant whenNotPaused {
		for (uint256 i = 0; i < tokenIds.length; i++) {
			uint256 tokenId = tokenIds[i];
			if (registryLookup[tokenId].expirationDate > block.timestamp)
				revert DomainNotExpired();

			if (
				registryLookup[tokenId].expirationDate + 30 days >
				block.timestamp
			) revert DomainIn30dayPeriod();
			maintainerBurn(tokenId);
		}
	}

	function setBaseUri(string memory _baseUri) public onlyAdmin {
		baseUri = _baseUri;
	}

	function setTld(string memory _tld) public onlyAdmin {
		tld = _tld;
	}

	function transferAdminRole(address _newAdmin) public onlyAdmin {
		_grantRole(DEFAULT_ADMIN_ROLE, _newAdmin);
	}

	function transferMaintainerRole(address _newMaintainer) public onlyAdmin {
		_grantRole(MAINTAINER_ROLE, _newMaintainer);
	}

	function transferAdminAndMaintainerRole(
		address _newOwner
	) public onlyAdmin {
		_grantRole(DEFAULT_ADMIN_ROLE, _newOwner);
		_grantRole(MAINTAINER_ROLE, _newOwner);
	}

	/*//////////////////////////////////////////////////////////////
                            PUBLIC WRITE FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function registerDomains(
		address[] memory owners,
		string[] memory domainNames,
		uint256[] memory expiries,
		address referral,
		uint256 credits
	) external payable nonReentrant whenNotPaused {
		uint256 totalPrice;
		uint16[] memory lengthsOfDomains = new uint16[](domainNames.length);

		for (uint256 i = 0; i < domainNames.length; i++) {
			uint256 expiry = expiries[i];
			string memory domainName = domainNames[i];
			if (!isValidDomainName(domainName)) {
				revert InvalidDomainName();
			}
			if (protectedDomains[domainName]) revert DomainIsProtected();
			uint16 lengthOfDomain = uint16(strlen(domainName));
			lengthsOfDomains[i] = lengthOfDomain;

			if (!isValidLength(lengthOfDomain)) revert InvalidLength();
			if (referral == msg.sender) revert SelfReferral();

			uint256 price = priceToRegister(lengthOfDomain);
			totalPrice += price;

			if (expiry > 1) {
				totalPrice += priceToRenew(lengthOfDomain) * (expiry - 1);
			}
		}

		if (credits > 0) {
			if (ZNSGiftCard(giftCard).getUserCredits(msg.sender) < credits) {
				revert NotEnoughCredits();
			}
			uint256 creditValue = getValueFromCredits(credits);
			ZNSGiftCard(giftCard).registryBurnCredits(msg.sender, credits);
			totalPrice -= creditValue;
		}

		if (msg.value < totalPrice) revert NotEnoughNativeTokenPaid();

		uint256 earnings = totalPrice;

		if (referral != address(0)) {
			uint256 referralBand = getReferralBand(referral);
			uint256 referralInBIPS = calculateActualFromBIPS(
				totalPrice,
				referralBand
			);
			userLookup[referral].numberOfReferrals += domainNames.length;
			userLookup[referral].totalEarnings += referralInBIPS;
			payable(referral).transfer(referralInBIPS);

			earnings -= referralInBIPS;
		}
		for (uint256 i = 0; i < profitSharingPartners.length; i++) {
			payable(profitSharingPartners[i]).transfer(
				calculateActualFromBIPS(earnings, profitSharesOfPartners[i])
			);
		}
		mintDomains(owners, domainNames, lengthsOfDomains, expiries);
	}

	function renewDomain(
		uint256 _tokenId,
		uint256 _years
	) external payable nonReentrant whenNotPaused {
		if (registryLookup[_tokenId].owner != msg.sender) revert NotOwner();
		if (_years == 0) revert InvalidExpiry();
		uint256 price = priceToRenew(registryLookup[_tokenId].lengthOfDomain) *
			_years;
		if (msg.value < price) revert NotEnoughNativeTokenPaid();
		for (uint256 i = 0; i < profitSharingPartners.length; i++) {
			payable(profitSharingPartners[i]).transfer(
				calculateActualFromBIPS(price, profitSharesOfPartners[i])
			);
		}
		registryLookup[_tokenId].expirationDate += 365 days * _years;
		emit RenewedDomain(
			_tokenId,
			registryLookup[_tokenId].expirationDate,
			addTLD(registryLookup[_tokenId].domainName)
		);
	}

	function setPrimaryDomain(
		uint256 _tokenId
	) external nonReentrant whenNotPaused {
		address owner = registryLookup[_tokenId].owner;
		if (owner != msg.sender) revert NotOwner();
		userLookup[owner].primaryDomain = _tokenId;
		emit PrimaryDomainSet(
			_tokenId,
			owner,
			addTLD(registryLookup[_tokenId].domainName)
		);
	}

	function burnDomain(uint256 _tokenId) external nonReentrant whenNotPaused {
		address owner = registryLookup[_tokenId].owner;
		if (owner != msg.sender) revert NotOwner();
		uint256[] memory ownedDomains = userLookup[owner].allOwnedDomains;
		uint256[] memory newOwnedDomains = new uint256[](
			ownedDomains.length - 1
		);
		uint256 counter = 0;
		for (uint256 i = 0; i < ownedDomains.length; i++) {
			if (ownedDomains[i] != _tokenId) {
				newOwnedDomains[counter] = ownedDomains[i];
				counter++;
			}
		}
		userLookup[owner].allOwnedDomains = newOwnedDomains;
		if (
			newOwnedDomains.length > 0 &&
			userLookup[owner].primaryDomain == _tokenId
		) {
			userLookup[owner].primaryDomain = newOwnedDomains[0];
			emit PrimaryDomainSet(
				newOwnedDomains[0],
				owner,
				addTLD(registryLookup[newOwnedDomains[0]].domainName)
			);
		} else {
			userLookup[owner].primaryDomain = 0;
			emit PrimaryDomainSet(0, owner, "");
		}
		delete registryLookup[_tokenId];
		_burn(_tokenId);

		clearDomain(_tokenId);
	}

	/*//////////////////////////////////////////////////////////////
                            INTERNAL FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function addTLD(
		string memory domainName
	) internal view returns (string memory) {
		return string.concat(domainName, string.concat(".", tld));
	}

	function getValueFromCredits(
		uint256 credits
	) internal view returns (uint256) {
		uint256 currentUSDPrice = getOraclePrice();
		return (credits * 1e18) / currentUSDPrice;
	}

	function isValidDomainName(
		string memory domainName
	) internal pure returns (bool) {
		bytes memory domainBytes = bytes(domainName);
		for (uint i = 0; i < domainBytes.length; i++) {
			// Check for lowercase letters, numbers, and the "-" character
			if (
				!(domainBytes[i] >= 0x30 && domainBytes[i] <= 0x39) && // 0-9
				!(domainBytes[i] >= 0x61 && domainBytes[i] <= 0x7A) && // a-z
				!(domainBytes[i] == 0x2D) && // "-" character
				!(domainBytes[i] > 0x7F) // Allow non-ASCII characters (basic check for emojis and other languages)
			) {
				// If the character is not a lowercase letter, number, "-", or > 0x7F (basic non-ASCII),
				// then it's invalid based on our criteria.
				return false;
			}
		}
		// Passed all checks
		return true;
	}

	function createTokenURI(
		uint256 _tokenId
	) internal view returns (string memory) {
		string memory tokenId = _tokenId.toString();

		uint256 id;
		assembly {
			id := chainid()
		}

		string memory tokenUri = string(
			abi.encodePacked(baseUri, "/", id.toString(), "/", tokenId)
		);

		return tokenUri;
	}

	function strlen(string memory s) internal pure returns (uint256) {
		uint256 len;
		uint256 i = 0;
		uint256 bytelength = bytes(s).length;
		for (len = 0; i < bytelength; len++) {
			bytes1 b = bytes(s)[i];
			if (b < 0x80) {
				i += 1;
			} else if (b < 0xE0) {
				i += 2;
			} else if (b < 0xF0) {
				i += 3;
			} else if (b < 0xF8) {
				i += 4;
			} else if (b < 0xFC) {
				i += 5;
			} else {
				i += 6;
			}
		}
		return len;
	}

	function isInvalidAddress(address _address) internal view returns (bool) {
		return _address == address(this) || _address == address(0);
	}

	function isValidLength(uint16 len) internal pure returns (bool) {
		return len > 0 && len <= 24;
	}

	function getReferralBand(address referral) public view returns (uint256) {
		if (partnerReferrals[referral] != 0) {
			return partnerReferrals[referral];
		}
		uint256 numberOfReferrals = userLookup[referral].numberOfReferrals;
		if (numberOfReferrals >= 0 && numberOfReferrals < 10)
			return referTicks[0];
		else if (numberOfReferrals >= 10 && numberOfReferrals < 30)
			return referTicks[1];
		else if (numberOfReferrals >= 30 && numberOfReferrals < 60)
			return referTicks[2];
		else if (numberOfReferrals >= 60 && numberOfReferrals < 100)
			return referTicks[3];
		else if (numberOfReferrals >= 100) return referTicks[4];
		else revert RefferalEarningCannotBeCalculated();
	}

	function calculateActualFromBIPS(
		uint256 price,
		uint256 bips
	) public pure returns (uint256) {
		return (price * bips) / 10000;
	}

	function mintDomains(
		address[] memory owners,
		string[] memory domainNames,
		uint16[] memory lengthsOfDomains,
		uint256[] memory expiries
	) internal whenNotPaused {
		if (
			domainNames.length != owners.length ||
			owners.length != expiries.length ||
			lengthsOfDomains.length != owners.length
		) {
			revert LengthsDoNotMatch();
		}

		uint256[] memory newTokenIds = new uint256[](domainNames.length);
		for (uint256 i = 0; i < domainNames.length; i++) {
			address owner = owners[i];
			string memory domainName = domainNames[i];
			uint256 expiry = expiries[i];
			uint16 lengthOfDomain = lengthsOfDomains[i];
			uint256 newRecordId = tokenID;
			newTokenIds[i] = newRecordId;

			if (isInvalidAddress(owners[i])) revert InvalidAddress();
			if (
				checkDomainStatus(domainLookup[domainName]) ==
				domainStatus.REGISTERED
			) revert AlreadyRegistered();
			if (
				checkDomainStatus(domainLookup[domainName]) ==
				domainStatus.EXPIRED
			) revert DomainExpiredButNotBurned();

			unchecked {
				tokenID++;
			}

			registryLookup[newRecordId] = RegistryData({
				owner: owner,
				domainName: domainName,
				lengthOfDomain: lengthOfDomain,
				expirationDate: block.timestamp + (365 days * expiry)
			});
			userLookup[owner].allOwnedDomains.push(newRecordId);
			domainLookup[domainName] = newRecordId;

			if (userLookup[owner].primaryDomain == 0) {
				userLookup[owner].primaryDomain = newRecordId;
				emit PrimaryDomainSet(newRecordId, owner, addTLD(domainName));
			}

			_safeMint(owner, newRecordId);
			_setTokenURI(newRecordId, createTokenURI(newRecordId));

			totalRegisteredDomains.push(newRecordId);
			idToDomain[newRecordId] = domainName;
			mintToExpire[newRecordId] = expiry;

			emit MintedDomain(
				addTLD(domainName),
				newRecordId,
				owner,
				registryLookup[newRecordId].expirationDate
			);
		}
	}

	function _beforeTokenTransfer(
		address from,
		address to,
		uint256 firstTokenId,
		uint256 batchSize
	) internal virtual override {
		super._beforeTokenTransfer(from, to, firstTokenId, batchSize);
		if (from != address(0) && to != address(0)) {
			if (checkDomainStatus(firstTokenId) == domainStatus.EXPIRED)
				revert DomainExpired();
			uint256[] memory ownedDomains = userLookup[from].allOwnedDomains;
			uint256[] memory newOwnedDomains = new uint256[](
				ownedDomains.length - batchSize
			);
			uint256 counter = 0;
			for (uint256 i = 0; i < ownedDomains.length; i++) {
				if (ownedDomains[i] != firstTokenId) {
					newOwnedDomains[counter] = ownedDomains[i];
					counter++;
				}
			}
			userLookup[from].allOwnedDomains = newOwnedDomains;
			if (
				newOwnedDomains.length > 0 &&
				userLookup[from].primaryDomain == firstTokenId
			) {
				userLookup[from].primaryDomain = newOwnedDomains[0];
				emit PrimaryDomainSet(
					newOwnedDomains[0],
					from,
					addTLD(registryLookup[newOwnedDomains[0]].domainName)
				);
			} else {
				userLookup[from].primaryDomain = 0;
				emit PrimaryDomainSet(0, from, "");
			}
			userLookup[to].allOwnedDomains.push(firstTokenId);
			if (userLookup[to].primaryDomain == 0) {
				userLookup[to].primaryDomain = firstTokenId;
				emit PrimaryDomainSet(
					firstTokenId,
					to,
					addTLD(registryLookup[firstTokenId].domainName)
				);
			}
			registryLookup[firstTokenId].owner = to;
		}
		emit TransferredDomain(
			addTLD(registryLookup[firstTokenId].domainName),
			firstTokenId,
			from,
			to
		);
	}

	function maintainerBurn(uint256 tokenId) internal {
		if (tokenId == 0) revert NotRegistered();
		address owner = registryLookup[tokenId].owner;
		uint256[] memory ownedDomains = userLookup[owner].allOwnedDomains;
		uint256[] memory newOwnedDomains = new uint256[](
			ownedDomains.length - 1
		);
		uint256 counter = 0;
		for (uint256 i = 0; i < ownedDomains.length; i++) {
			if (ownedDomains[i] != tokenId) {
				newOwnedDomains[counter] = ownedDomains[i];
				counter++;
			}
		}
		userLookup[owner].allOwnedDomains = newOwnedDomains;
		if (
			newOwnedDomains.length > 0 &&
			userLookup[owner].primaryDomain == tokenId
		) {
			userLookup[owner].primaryDomain = newOwnedDomains[0];
			emit PrimaryDomainSet(
				newOwnedDomains[0],
				owner,
				addTLD(registryLookup[newOwnedDomains[0]].domainName)
			);
		} else {
			userLookup[owner].primaryDomain = 0;
			emit PrimaryDomainSet(0, owner, "");
		}
		delete registryLookup[tokenId];
		_burn(tokenId);

		clearDomain(tokenId);
	}

	function clearDomain(uint256 _tokenId) internal {
		idToDomain[_tokenId] = "";

		for (uint256 i = 0; i < totalRegisteredDomains.length; i++) {
			if (totalRegisteredDomains[i] == _tokenId) {
				totalRegisteredDomains[i] = totalRegisteredDomains[
					totalRegisteredDomains.length - 1
				];
				totalRegisteredDomains.pop();
			}
		}
	}

	/*//////////////////////////////////////////////////////////////
                            DEPENDANCY FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function supportsInterface(
		bytes4 interfaceId
	)
		public
		view
		virtual
		override(ERC721URIStorage, AccessControl)
		returns (bool)
	{
		return super.supportsInterface(interfaceId);
	}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

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

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

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

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

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

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

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

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

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

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

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4906.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";
import "./IERC721.sol";

/// @title EIP-721 Metadata Update Extension
interface IERC4906 is IERC165, IERC721 {
    /// @dev This event emits when the metadata of a token is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFT.
    event MetadataUpdate(uint256 _tokenId);

    /// @dev This event emits when the metadata of a range of tokens is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFTs.
    event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC721.sol)

pragma solidity ^0.8.0;

import "../token/ERC721/IERC721.sol";

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

pragma solidity ^0.8.0;

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

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

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

    bool private _paused;

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

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

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

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

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

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

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

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

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

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

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

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

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

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

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or 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 the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @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 _ownerOf(tokenId) != address(0);
    }

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

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

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

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

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

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

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

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

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @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, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

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

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

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

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

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../../interfaces/IERC4906.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is IERC4906, ERC721 {
    using Strings for uint256;

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

    /**
     * @dev See {IERC165-supportsInterface}
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, IERC165) returns (bool) {
        return interfaceId == bytes4(0x49064906) || super.supportsInterface(interfaceId);
    }

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

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

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

        return super.tokenURI(tokenId);
    }

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

        emit MetadataUpdate(tokenId);
    }

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

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

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

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

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

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

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

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

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

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.21;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import { ZNSOracle } from "./ZNSOracle.sol";

contract ZNSGiftCard is
	ERC721URIStorage,
	Pausable,
	ReentrancyGuard,
	AccessControl
{
	/*//////////////////////////////////////////////////////////////
                            INITIALIZATION
    //////////////////////////////////////////////////////////////*/

	uint256 public giftTokenID;
	mapping(uint256 => uint256) public giftCardBalances;
	string public tokenURI;

	address public oracle = 0xFb2Cd41a8aeC89EFBb19575C6c48d872cE97A0A5;

	struct UserData {
		uint256 credits;
		uint256[] ownedGiftCards;
	}

	mapping(address => UserData) internal userData;
	address public treasury = 0xD00c70F9b78C63a36519C488F862DF95b7A73d90;
	address public registry;

	bytes32 public constant MAINTAINER_ROLE = keccak256("MAINTAINER_ROLE");

	constructor(
		string memory _tokenURI
	) ERC721("ZNS Gift Cards", "ZNSGiftCard") {
		tokenURI = _tokenURI;
		giftTokenID++;
		_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
		_grantRole(MAINTAINER_ROLE, msg.sender);
	}

	/*//////////////////////////////////////////////////////////////
                            CUSTOM MODIFIERS
    //////////////////////////////////////////////////////////////*/

	modifier onlyMaintainer() {
		require(
			hasRole(MAINTAINER_ROLE, msg.sender),
			"maintainer role required"
		);
		_;
	}

	modifier onlyAdmin() {
		require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "admin role required");
		_;
	}

	/*//////////////////////////////////////////////////////////////
                            CUSTOM ERRORS
    //////////////////////////////////////////////////////////////*/

	error InvalidAddress();
	error NotEnoughNativeTokenPaid();
	error AmountMustBeGreaterThanZero();
	error NotOwner();
	error NotEnoughCredits();
	error LengthsDoNotMatch();

	/*//////////////////////////////////////////////////////////////
                            USER READ FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function getUserCredits(address _user) public view returns (uint256) {
		return userData[_user].credits;
	}

	function getUserOwnedGiftCards(
		address _user
	) public view returns (uint256[] memory) {
		return userData[_user].ownedGiftCards;
	}

	function getOraclePrice() public view returns (uint256) {
		return ZNSOracle(oracle).priceToUSD();
	}

	/*//////////////////////////////////////////////////////////////
                            USER WRITE FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function mintGiftCard(
		address _to
	) public payable whenNotPaused nonReentrant {
		if (msg.value <= 0) revert AmountMustBeGreaterThanZero();
		if (isInvalidAddress(_to)) revert InvalidAddress();
		uint256 credits = getCreditsFromValue(msg.value);
		if (credits <= 0) revert NotEnoughNativeTokenPaid();
		giftCardBalances[giftTokenID] = credits;
		userData[_to].ownedGiftCards.push(giftTokenID);
		_safeMint(_to, giftTokenID);
		_setTokenURI(giftTokenID, tokenURI);
		payable(treasury).transfer(msg.value);
		unchecked {
			giftTokenID++;
		}
	}

	function burnGiftCard(uint256 _tokenId) public whenNotPaused nonReentrant {
		if (msg.sender != ownerOf(_tokenId)) revert NotOwner();
		userData[msg.sender].credits += giftCardBalances[_tokenId];
		giftCardBalances[_tokenId] = 0;
		uint256[] memory newOwnedCards = new uint256[](
			userData[msg.sender].ownedGiftCards.length - 1
		);
		uint256 counter = 0;
		uint256[] memory ownedCards = userData[msg.sender].ownedGiftCards;
		for (uint256 i = 0; i < ownedCards.length; i++) {
			if (ownedCards[i] != _tokenId) {
				newOwnedCards[counter] = ownedCards[i];
				counter++;
			}
		}
		userData[msg.sender].ownedGiftCards = newOwnedCards;
		_burn(_tokenId);
	}

	/*//////////////////////////////////////////////////////////////
                            ADMIN WRITE FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function adminMintGiftCards(
		address[] memory _to,
		uint256[] memory _amountOfCredits
	) public onlyAdmin nonReentrant whenNotPaused {
		if (_to.length != _amountOfCredits.length) revert LengthsDoNotMatch();

		for (uint256 i = 0; i < _to.length; i++) {
			if (isInvalidAddress(_to[i])) revert InvalidAddress();
			uint newGiftTokenID = giftTokenID;
			userData[_to[i]].ownedGiftCards.push(newGiftTokenID);
			giftCardBalances[newGiftTokenID] = _amountOfCredits[i];
			_safeMint(_to[i], newGiftTokenID);
			_setTokenURI(newGiftTokenID, tokenURI);
			unchecked {
				giftTokenID++;
			}
		}
	}

	function setTreasury(
		address _treasury
	) public onlyAdmin nonReentrant whenNotPaused {
		if (isInvalidAddress(_treasury)) revert InvalidAddress();
		treasury = _treasury;
	}

	function adminWithdraw() public onlyAdmin nonReentrant whenNotPaused {
		payable(msg.sender).transfer(address(this).balance);
	}

	function setRegistry(
		address _registry
	) public onlyAdmin nonReentrant whenNotPaused {
		if (isInvalidAddress(_registry)) revert InvalidAddress();
		registry = _registry;
		_grantRole(MAINTAINER_ROLE, registry);
	}

	function registryBurnCredits(
		address _to,
		uint256 _amountOfCredits
	) public onlyMaintainer nonReentrant whenNotPaused {
		if (_amountOfCredits <= 0) revert AmountMustBeGreaterThanZero();
		if (isInvalidAddress(_to)) revert InvalidAddress();
		if (userData[_to].credits < _amountOfCredits) revert NotEnoughCredits();
		userData[_to].credits -= _amountOfCredits;
	}

	function setTokenURI(
		string memory _tokenURI
	) public onlyAdmin whenNotPaused nonReentrant {
		tokenURI = _tokenURI;
	}

	function setOracle(
		address _oracleAddress
	) public onlyAdmin nonReentrant whenNotPaused {
		if (isInvalidAddress(_oracleAddress)) revert InvalidAddress();
		oracle = _oracleAddress;
	}

	function pause() external onlyAdmin nonReentrant {
		_pause();
	}

	function unpause() external onlyAdmin nonReentrant {
		_unpause();
	}

	/*//////////////////////////////////////////////////////////////
                            INTERNAL FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function isInvalidAddress(address _address) internal view returns (bool) {
		return _address == address(this) || _address == address(0);
	}

	function getCreditsFromValue(
		uint256 _value
	) internal view returns (uint256) {
		uint256 currentUSDPrice = getOraclePrice();
		return (_value * currentUSDPrice) / 1e18;
	}

	/*//////////////////////////////////////////////////////////////
                            INTERNAL FUNCTIONS
    //////////////////////////////////////////////////////////////*/

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

		// Skip if minting (from == address(0)) or burning (to == address(0))
		// These operations are already handled in mintGiftCard and burnGiftCard
		if (from != address(0) && to != address(0)) {
			// Remove the token from the sender's userData
			uint256[] memory ownedCards = userData[from].ownedGiftCards;
			uint256[] memory newOwnedCards = new uint256[](
				ownedCards.length - 1
			);

			uint256 counter = 0;
			for (uint256 i = 0; i < ownedCards.length; i++) {
				if (ownedCards[i] != tokenId) {
					newOwnedCards[counter] = ownedCards[i];
					counter++;
				}
			}

			// Update sender's owned gift cards
			userData[from].ownedGiftCards = newOwnedCards;

			// Add the token to the recipient's userData
			userData[to].ownedGiftCards.push(tokenId);
		}
	}

	/*//////////////////////////////////////////////////////////////
                            DEPENDANCY FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function supportsInterface(
		bytes4 interfaceId
	)
		public
		view
		virtual
		override(ERC721URIStorage, AccessControl)
		returns (bool)
	{
		return super.supportsInterface(interfaceId);
	}
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.21;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract ZNSOracle is AccessControl, ReentrancyGuard, Pausable {
	/*//////////////////////////////////////////////////////////////
                            INITIALIZATION
    //////////////////////////////////////////////////////////////*/
	uint256 public priceToUSD = 1e18;

	bytes32 public constant MAINTAINER_ROLE = keccak256("MAINTAINER_ROLE");

	constructor() {
		_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
		_grantRole(MAINTAINER_ROLE, msg.sender);
	}

	/*//////////////////////////////////////////////////////////////
                            CUSTOM MODIFIERS
    //////////////////////////////////////////////////////////////*/

	modifier onlyMaintainer() {
		require(
			hasRole(MAINTAINER_ROLE, msg.sender),
			"maintainer role required"
		);
		_;
	}

	modifier onlyAdmin() {
		require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "admin role required");
		_;
	}

	/*//////////////////////////////////////////////////////////////
                            ADMIN WRITE FUNCTIONS
    //////////////////////////////////////////////////////////////*/

	function setPrice(
		uint256 _currentPrice
	) public onlyMaintainer nonReentrant whenNotPaused {
		priceToUSD = _currentPrice;
	}
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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":"uint256"}],"internalType":"struct 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ternalType":"address","name":"_newMaintainer","type":"address"}],"name":"transferMaintainerRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"userLookupByAddress","outputs":[{"components":[{"internalType":"uint256","name":"primaryDomain","type":"uint256"},{"internalType":"uint256[]","name":"allOwnedDomains","type":"uint256[]"},{"internalType":"uint256","name":"numberOfReferrals","type":"uint256"},{"internalType":"uint256","name":"totalEarnings","type":"uint256"}],"internalType":"struct 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000000000000000000000000fb2cd41a8aec89efbb19575c6c48d872ce97a0a500000000000000000000000059b9ac688e39a14b938ac8c3269db66d8adb9af6000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000072e6b6174616e610000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000066b6174616e610000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _oracle (address): 0xFb2Cd41a8aeC89EFBb19575C6c48d872cE97A0A5
Arg [1] : _giftCard (address): 0x59B9Ac688e39A14b938AC8C3269db66D8aDB9aF6
Arg [2] : _symbol (string): .katana
Arg [3] : _tld (string): katana

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000fb2cd41a8aec89efbb19575c6c48d872ce97a0a5
Arg [1] : 00000000000000000000000059b9ac688e39a14b938ac8c3269db66d8adb9af6
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [5] : 2e6b6174616e6100000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [7] : 6b6174616e610000000000000000000000000000000000000000000000000000