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// SPDX-License-Identifier: MIT
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

/*
 ____                   _           _         
|  _ \                 | |         | |        
| |_) | __ _ ___  ___  | |     __ _| |__  ___ 
|  _ < / _` / __|/ _ \ | |    / _` | '_ \/ __|
| |_) | (_| \__ \  __/ | |___| (_| | |_) \__ \
|____/ \__,_|___/\___| |______\__,_|_.__/|___/
                                              
*/

pragma solidity ^0.8.7;

/**
 * @title Crypto
 * @author BaseLabs
 */
contract Crypto {
    bytes constant ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
    /**
     * @notice base58 is used to calculate the base58 encoded value of given bytes.
     * This algorithm was migrated from github.com/mr-tron/base58 to solidity by our developers.
     * Note that it is not yet optimized for gas, so please use it only in read-only scenarios.
     * @param data_ bytes.
     * @return base58 encoded results.
     */
    function base58(bytes memory data_) public pure returns (bytes memory){
        uint256 size = data_.length;
        uint256 zeroCount;
        while (zeroCount < size && data_[zeroCount] == 0) {
            zeroCount++;
        }
        size = zeroCount + (size - zeroCount)*8351/6115+1;
        bytes memory slot = new bytes(size);
        uint32 carry;
        int256 m;
        int256 high = int256(size) - 1;
        for (uint256 i = 0; i < data_.length; i++) {
            m = int256(size - 1);
            for (carry = uint8(data_[i]); m > high || carry != 0; m--) {
                carry = carry + 256 * uint8(slot[uint256(m)]);
                slot[uint256(m)] = bytes1(uint8(carry % 58));
                carry /= 58;
            }
            high = m;
        }
        uint256 n;
        for (n = zeroCount; n < size && slot[n] == 0; n++) {}
        size = slot.length - (n - zeroCount);
        bytes memory out = new bytes(size);
        for (uint256 i = 0; i < size; i++) {
            uint256 j = i + n - zeroCount;
            out[i] = ALPHABET[uint8(slot[j])];
        }
        return out;
    }

    /**
     * @notice cidv0 is used to convert sha256 hash to cid(v0) used by IPFS.
     * @param sha256Hash_ sha256 hash generated by anything.
     * @return IPFS cid that meets the version0 specification.
     */
    function cidv0(bytes32 sha256Hash_) public pure returns (string memory) {
        bytes memory hashString = new bytes(34);
        hashString[0] = 0x12;
        hashString[1] = 0x20;
        for (uint256 i = 0; i < sha256Hash_.length; i++) {
            hashString[i+2] = sha256Hash_[i];
        }
        return string(base58(hashString));
    }
}

/**
 * @title CheersUp
 * @author BaseLabs
 */
contract CheersUp is ERC721, Pausable, Ownable, ReentrancyGuard, Crypto {
    event RevealingURIChanged(string uri);
    event Refunded(address indexed from, address indexed to, uint256 indexed tokenId);
    event CheersUpRevealed(uint256 indexed cucpTokenId, uint256 indexed cheersUpTokenId);
    event TokenHashSet(uint256 indexed tokenId, bytes32 tokenHash);
    event ProvenanceUpdated(string procenance);
    event Withdraw(address indexed account, uint256 amount);
    event Deposit(address indexed account, uint256 amount);
    event CUCPContractAddressChanged(address indexed contractAddress);
    event MaintainerAddressChanged(address indexed maintainer);
    event RefundConfigChanged(RefundConfig config);

    event ContractSealed();

    struct RefundConfig {
        uint256 startTime;
        uint256 endTime;
        uint256 price;
        address beneficiary;
    }
    uint256 public constant MAX_TOKEN = 5000;

    string public provenance;
    string public revealingURI;
    address public cucpContractAddress;
    address public maintainerAddress;
    bool public contractSealed;
    RefundConfig public refundConfig;

    uint256[MAX_TOKEN] internal _randIndices;
    uint256 private _numberMinted;
    mapping(uint256 => bytes32) private _tokenHashes;

    constructor(
        string memory revealingURI_,
        address cucpContractAddress_,
        address maintainerAddress_,
        string memory provenance_
    ) ERC721("Cheers UP", "CUP") {
        revealingURI = revealingURI_;
        cucpContractAddress = cucpContractAddress_;
        maintainerAddress = maintainerAddress_;
        provenance = provenance_;
    }


    /***********************************|
    |               Core                |
    |__________________________________*/

    /**
     * @notice mint is used to randomly generate a token for address_. 
     * It can only be called by the CheersUpPeriod contract.
     * @param address_ specify which address will get the token.
     * @param cucpTokenId_ defines which tokenId in the CheersUpPeriod contract this call originates from.
     * @return randomly generated TokenId
     */
    function mint(address address_, uint256 cucpTokenId_) public returns(uint256) {
        require(_msgSender() == cucpContractAddress, "not authorized");
        require(_numberMinted + 1 <= MAX_TOKEN, "mint would exceed max supply");
        require(cucpTokenId_ < MAX_TOKEN, "tokenId is invalid");
        uint256 tokenId = getRandomTokenId();
        _safeMint(address_, tokenId);
        unchecked {
            _numberMinted += 1;
        }
        emit CheersUpRevealed(cucpTokenId_, tokenId);
        return tokenId;
    }

    /**
     * @notice getRandomTokenId is used to randomly select an unused tokenId.
     * @return randomly selected tokenId.
     */
    function getRandomTokenId() internal returns (uint256) {
        unchecked {
            uint256 remain = MAX_TOKEN - _numberMinted;
            uint256 pos = unsafeRandom() % remain;
            uint256 val = _randIndices[pos] == 0 ? pos : _randIndices[pos];
            _randIndices[pos] = _randIndices[remain - 1] == 0 ? remain - 1 : _randIndices[remain - 1];
            return val;
        }
    }

    /**
     * @notice unsafeRandom is used to generate a random number by on-chain randomness. 
     * Please note that on-chain random is potentially manipulated by miners, and most scenarios suggest using VRF.
     * @return randomly generated number.
     */
    function unsafeRandom() internal view returns (uint256) {
        unchecked {
            return uint256(keccak256(abi.encodePacked(
                blockhash(block.number-1), 
                block.difficulty, 
                block.timestamp, 
                block.coinbase,
                _numberMinted, 
                tx.origin
            )));
        }
    }

    /**
     * @notice The NFT holder can use this method to perform refund token
     * and a certain amount of ETH will be sent to the caller.
     * @param tokenId_ which token to refund
     */
    function refund(uint256 tokenId_) external callerIsUser nonReentrant {
        require(isRefundEnabled(), "refund has not enabled");
        require(address(this).balance > refundConfig.price, "insufficient contract funds");
        address from = _msgSender();
        address to = refundConfig.beneficiary;
        require(ownerOf(tokenId_) == from, "caller is not owner");
        safeTransferFrom(from, to, tokenId_);
        payable(from).transfer(refundConfig.price);
        emit Refunded(from, to, tokenId_);
    }

    /**
     * @notice issuer have permission to burn token.
     * @param tokenIds_ list of tokenId
     */
    function burn(uint256[] calldata tokenIds_) external onlyOwner nonReentrant  {
        for (uint256 i = 0; i < tokenIds_.length; i++) {
            uint256 tokenId = tokenIds_[i];
            require(ownerOf(tokenId) == _msgSender(), "caller is not owner");
            _burn(tokenId);
        }
    }

    /**
     * @notice issuer have permission to deposit ETH into the contract, which is used to support the refund logic.
     */
    function deposit() external payable onlyOwner nonReentrant {
        emit Deposit(_msgSender(), msg.value);
    }

    /**
     * @notice issuer withdraws the ETH temporarily stored in the contract through this method.
     */
    function withdraw() external onlyOwner nonReentrant {
        uint256 balance = address(this).balance;
        payable(_msgSender()).transfer(balance);
        emit Withdraw(_msgSender(), balance);
    }


    /***********************************|
    |             Brewing               |
    |__________________________________*/

    event BrewingStarted(uint256 indexed tokenId, address indexed account);
    event BrewingStopped(uint256 indexed tokenId, address indexed account);
    event BrewingInterrupted(uint256 indexed tokenId);
    event BrewingTokenTransfered(address indexed from, address indexed to, uint256 indexed tokenId);
    event BrewingAllowedFlagChanged(bool isBrewingAllowed);
    struct BrewingStatus {
        uint256 lastStartTime;
        uint256 total;
        bool brewingTransferLockTempRelease;
    }
    bool public isBrewingAllowed;
    mapping(uint256 => BrewingStatus) private _brewingStatuses;

    /**
     * @notice safeTransferWhileBrewing is used to safely transfer tokens without changing the brewing state.
     * @param from_ cannot be the zero address.
     * @param to_ cannot be the zero address.
     * @param tokenId_ token must exist and be owned by `from`.
     */
    function safeTransferWhileBrewing(address from_, address to_, uint256 tokenId_) external nonReentrant {
        require(ownerOf(tokenId_) == _msgSender(), "caller is not owner");
        _brewingStatuses[tokenId_].brewingTransferLockTempRelease = true;
        safeTransferFrom(from_, to_, tokenId_);
        _brewingStatuses[tokenId_].brewingTransferLockTempRelease = false;
        if (_brewingStatuses[tokenId_].lastStartTime != 0) {
            emit BrewingTokenTransfered(from_, to_, tokenId_);
        }
    }

    /**
     * @notice setIsBrewingAllowed is used to set the global switch to control whether users are allowed to brew.
     * @param isBrewingAllowed_ set to true to allow
     */
    function setIsBrewingAllowed(bool isBrewingAllowed_) external onlyOwner {
        isBrewingAllowed = isBrewingAllowed_;
        emit BrewingAllowedFlagChanged(isBrewingAllowed);
    }

    /**
     * @notice getTokenBrewingStatus is used to get the detailed brewing status of a specific token.
     * @param tokenId_ token id
     * @return isBrewing_ whether the current token is brewing.
     * @return current_ how long the token has been brewing in the hands of the current hodler.
     * @return total_ total amount of brewing since the token minted.
     */
    function getTokenBrewingStatus(uint256 tokenId_) external view returns (bool isBrewing_, uint256 current_, uint256 total_) {
        require(_exists(tokenId_), "query for nonexistent token");
        BrewingStatus memory status = _brewingStatuses[tokenId_];
        if (status.lastStartTime != 0) {
            isBrewing_ = true;
            current_ = block.timestamp - status.lastStartTime;
        }
        total_ = status.total + current_;
    }

    /**
     * @notice setTokenBrewingState is used to modify the Brewing state of the Token, 
     * only the Owner of the Token has this permission.
     * @param tokenIds_ list of tokenId
     * @param state_ If true, brew will be started. If false, brew will be stopped.
     */
    function setTokenBrewingState(uint256[] calldata tokenIds_, bool state_) external nonReentrant {
        unchecked {
            for (uint256 i = 0; i < tokenIds_.length; i++) {
                uint256 tokenId = tokenIds_[i];
                require(ownerOf(tokenId) == _msgSender(), "caller is not owner");
                BrewingStatus storage status = _brewingStatuses[tokenId];
                uint256 lastStartTime = status.lastStartTime;
                if (state_ && lastStartTime == 0) {
                    require(isBrewingAllowed, "brewing is not allowed");
                    status.lastStartTime = block.timestamp;
                    emit BrewingStarted(tokenId, _msgSender());
                } else if (!state_ && lastStartTime > 0) {
                    status.total += block.timestamp - lastStartTime;
                    status.lastStartTime = 0;
                    emit BrewingStopped(tokenId, _msgSender());
                }
            }
        }
    }

    /**
     * @notice interruptTokenBrewing gives the issuer the right to forcibly interrupt the brewing state of the token.
     * One scenario of using it is: someone may maliciously place low-priced brewing tokens on
     * the secondary market (because brewing tokens cannot be traded).
     * @param tokenIds_ the tokenId list to operate
     */
    function interruptTokenBrewing(uint256[] calldata tokenIds_) external atLeastMaintainer {
        for (uint256 i = 0; i < tokenIds_.length; i++) {
            uint256 tokenId = tokenIds_[i];
            require(_exists(tokenId), "operate for nonexistent token");
            BrewingStatus storage status = _brewingStatuses[tokenId];
            require(status.lastStartTime != 0, "brewing is not started");
            unchecked {
                status.total += block.timestamp - status.lastStartTime;
                status.lastStartTime = 0;
            }
            emit BrewingStopped(tokenId, _msgSender());
            emit BrewingInterrupted(tokenId);
        }
    }


    /***********************************|
    |             Getter                |
    |__________________________________*/


    /**
     * @notice totalMinted is used to return the total number of tokens minted. 
     * Note that it does not decrease as the token is burnt.
     */
    function totalMinted() public view returns (uint256) {
        return _numberMinted;
    }

    /**
     * @notice isRevealEnabled is used to return whether the refund has been enabled
     */
    function isRefundEnabled() public view returns (bool) {
        if (refundConfig.endTime > 0 && block.timestamp > refundConfig.endTime) {
            return false;
        }
        return refundConfig.startTime > 0 &&
            block.timestamp > refundConfig.startTime &&
            refundConfig.price > 0 && 
            refundConfig.beneficiary != address(0);
    }

    /**
     * @notice tokenURI will return the URI of the metadata of the token, 
     * if the Token has not completed reveal, then it will return the revealingURI.
     * @return metadata uri
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "query for nonexistent token");
        bytes32 hash = _tokenHashes[tokenId];
        if (hash == "") {
            return revealingURI;
        }
        return string(abi.encodePacked("ipfs://", cidv0(hash)));
    }


    /***********************************|
    |             Setter                |
    |__________________________________*/


    /**
     * @notice setProvenance is used to allow the issuer to modify the provenance in special cases.
     * This process is under the supervision of the community.
     */
    function setProvenance(string memory provenance_) external onlyOwner {
        provenance = provenance_;
        emit ProvenanceUpdated(provenance);
    }

    /**
     * @notice setRevealingURI is used to allow the issuer to modify the revealingURI in special cases.
     * This process is under the supervision of the community.
     */
    function setRevealingURI(string memory revealingURI_) external onlyOwner {
        revealingURI = revealingURI_;
        emit RevealingURIChanged(revealingURI);
    }

    /**
     * @notice setCUCPContractAddress is used to allow the issuer to modify the cucpContractAddress in special cases.
     * This process is under the supervision of the community.
     */
    function setCUCPContractAddress(address address_) external onlyOwner {
        cucpContractAddress = address_;
        emit CUCPContractAddressChanged(address_);
    }

    /**
     * @notice setMaintainerAddress is used to allow the issuer to modify the maintainerAddress
     */
    function setMaintainerAddress(address maintainerAddress_) external onlyOwner {
        maintainerAddress = maintainerAddress_;
        emit MaintainerAddressChanged(maintainerAddress_);
    }

    /**
     * @notice setRefundConfig allows issuer to set refundConfig
     */
    function setRefundConfig(RefundConfig calldata config_) external onlyOwner {
        require(config_.beneficiary != address(0), "beneficiary is required");
        refundConfig = config_;
        emit RefundConfigChanged(config_);
    }

    /**
     * @notice setTokenHash is used to set the ipfs hash of the token
     * This process is under the supervision of the community.
     */
    function setTokenHash(uint256 tokenId_, bytes32 tokenHash_) public atLeastMaintainer {
        _tokenHashes[tokenId_] = tokenHash_;
        emit TokenHashSet(tokenId_, tokenHash_);
    }

    /**
     * @notice similar to setTokenHash, but in bulk
     */
    function batchSetTokenHash(uint256[] calldata tokenIds_, bytes32[] calldata tokenHashes_) external atLeastMaintainer {
        require(tokenIds_.length == tokenHashes_.length, "tokenIds_ and tokenHashes_ length mismatch");
        require(tokenIds_.length > 0, "no tokenId");
        for (uint256 i = 0; i < tokenIds_.length; i++) {
            setTokenHash(tokenIds_[i], tokenHashes_[i]);
        }
    }



    /***********************************|
    |          Pause & Hooks            |
    |__________________________________*/

    /**
     * @notice hook function, used to intercept the transfer of token.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        require(!paused(), "token transfer paused");
        if (!_brewingStatuses[tokenId].brewingTransferLockTempRelease) {
            require(_brewingStatuses[tokenId].lastStartTime == 0, "token is brewing");
        }
        super._beforeTokenTransfer(from, to, tokenId);
    }

    /**
     * @notice for the purpose of protecting user assets, under extreme conditions, 
     * the circulation of all tokens in the contract needs to be frozen.
     * This process is under the supervision of the community.
     */
    function emergencyPause() external onlyOwner notSealed {
        _pause();
    }

    /**
     * @notice unpause the contract
     */
    function unpause() external onlyOwner notSealed {
        _unpause();
    }

    /**
     * @notice when the project is stable enough, the issuer will call sealContract 
     * to give up the permission to call emergencyPause and unpause.
     */
    function sealContract() external onlyOwner {
        contractSealed = true;
        emit ContractSealed();
    }



    /***********************************|
    |              Modifier             |
    |__________________________________*/


    /**
     * @notice for security reasons, CA is not allowed to call sensitive methods.
     */
    modifier callerIsUser() {
        require(tx.origin == _msgSender(), "the caller is another contract");
        _;
    }

    /**
     * @notice function call is only allowed when the contract has not been sealed
     */
    modifier notSealed() {
        require(!contractSealed, "contract sealed");
        _;
    }
    /**
     * @notice only owner or maintainer has the permission to call this method
     */
    modifier atLeastMaintainer() {
        require(owner() == _msgSender() || 
            (maintainerAddress != address(0) && maintainerAddress == _msgSender()), 
            "not authorized");
        _;
    }
}

// QmWYifytzWVJdoaacoKJWBbe7BVJ4pR47VBmB6FSMFa4dB

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

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        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 v4.5.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

// 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 v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

// 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);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : revealingURI_ (string): ipfs://QmQmWVwFfxnYmdGQZhXxoLFpyYrGC2mtNua6vjoSkDJffr
Arg [1] : cucpContractAddress_ (address): 0xa5Bb28eecC6134F89745E34ec6aB5d5Bcb16dAD7
Arg [2] : maintainerAddress_ (address): 0x2d1e012EAAD63ef9a0c2d94022db16e5796D881C
Arg [3] : provenance_ (string): c4c3229b618ad30b2f255325f94f9475b4af9d97794ab223c6d51499786a999c

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 000000000000000000000000a5bb28eecc6134f89745e34ec6ab5d5bcb16dad7
Arg [2] : 0000000000000000000000002d1e012eaad63ef9a0c2d94022db16e5796d881c
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000035
Arg [5] : 697066733a2f2f516d516d5756774666786e596d6447515a6858786f4c467079
Arg [6] : 59724743326d744e756136766a6f536b444a6666720000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [8] : 6334633332323962363138616433306232663235353332356639346639343735
Arg [9] : 6234616639643937373934616232323363366435313439393738366139393963