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pragma solidity ^0.8.13;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
//SPDX-License-Identifier: MIT

/// @notice Thrown when completing the transaction results in overallocation of LemonApe Stands.
error MintedOut();
/// @notice Thrown when a user is trying to upgrade a stand, but does not have the previous stand in the upgrade flow.
error MissingPerviousStand();
/// @notice Thrown when the dutch auction phase has not yet started, or has already ended.
error MintNotStarted();
/// @notice Thrown when the upgrade phase has not yet started
error UpgradeNotStarted();
/// @notice Thrown when the user has already minted two LemonApe Stands in the dutch auction.
error MintingTooMany();
/// @notice Thrown when the value of the transaction is not enough for the current dutch auction or mintlist price.
error ValueTooLow();
/// @notice Thrown when a user is trying to upgrade past the highest stand level.
error MissingPreviousNFT();
/// @notice Thrown when a user doesn't have the previous stand level.
error UnknownUpgrade();

interface IERC20 {
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom( address from, address to, uint256 amount) external returns (bool);
}

/// @title Generation 0 and 1 LemonApeStand NFTs
// contract LemonApeStandNFT is ERC721, Ownable {
contract LemonApeStandNFT is ERC721Enumerable, Ownable {
    using Strings for uint256;

    /*///////////////////////////////////////////////////////////////
                               CONSTANTS
    //////////////////////////////////////////////////////////////*/

    /// @dev Determines the order of the species for each tokenId, mechanism for choosing starting index explained post mint, explanation hash: acb427e920bde46de95103f14b8e57798a603abcf87ff9d4163e5f61c6a56881.
    uint constant public provenanceHash = 0x9912e067bd3802c3b007ce40b6c125160d2ccb5352d199e20c092fdc17af8057;

    /// @dev Sole receiver of collected contract $LAS - dev wallet until staking contract live. Dev wallet will move tokens to staking
    address public stakingContract = 0x73199233184A4F01CCcbB30f31989f8e6e9cf34E;

    /// @dev Address of $LAS to mint Lemon Stands
    address public lasToken = 0x84c071CbFa571Af3c6c966f80530867D0d407F6E;

    /// @dev Address of $POTION to mint higher tier stands
    address public potionToken = 0x980693AbB2D6A92Bc67e95C9c646d24275D8236d;

    /// @dev 435 total nfts can ever be made
    uint constant lemonStandTotalSupply = 300;
    uint constant grapeStandTotalSupply = 100;
    uint constant dragonStandTotalSupply = 25;
    uint constant fourTwentyStandTotalSupply = 10;
    uint constant mintSupply = lemonStandTotalSupply + grapeStandTotalSupply + dragonStandTotalSupply + fourTwentyStandTotalSupply;
    uint256 public currentLemonStandPrice = 1000 * 10**18;

    /// @dev The offsets are the tokenIds that the corresponding evolution stage will begin minting at.

    uint constant grapeStandOffset = lemonStandTotalSupply;
    uint constant dragonStandOffset = grapeStandOffset + grapeStandTotalSupply;
    uint constant fourTwentyStandOffset = dragonStandOffset + dragonStandTotalSupply;

    /*///////////////////////////////////////////////////////////////
                        UPGRADE STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @dev The next tokenID to be minted for each of the stand stages
    uint lemonStandSupply; //300
    uint grapeStandSupply; //100
    uint dragonStandSupply; //25
    uint fourTwentyStandSupply; //10

    /*///////////////////////////////////////////////////////////////
                            MINT STORAGE
    //////////////////////////////////////////////////////////////*/
    /// @notice The timestamp the minting for Lemon Stands started
    bool public canStartMint;
    bool public canUpgradeStand;

    /// @notice The timestamp of the last time a Lemon Stand was minted
    uint256 public lastTimeMinted;
    uint256 public reductionTime = 1 hours;

    /// @notice Starting price of the Lemon Stand in $LAS (1,000 $LAS)
    uint256 constant public startPrice = 1000 * 10**18;

    uint256 public mintLimit = 3;

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

    string public baseURI;

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

    /// @notice Deploys the contract, airdropping to presalers.
    constructor(string memory _baseURI, address[] memory dropLemonStands) ERC721("LEMONAPESTAND NFT", "LASNFT") {
        baseURI = _baseURI;
        unchecked {
            for (uint256 i = 0; i < dropLemonStands.length; i++) {
                uint256 mintIndex = totalSupply();
                _mint(dropLemonStands[i], mintIndex);
                lemonStandSupply++;
                emit Transfer(address(0), dropLemonStands[i], i);
            }
        }
    }

    function setMintLimit(uint256 _mintLimit) public onlyOwner {
        mintLimit = _mintLimit;
    }

    function enableMint() public onlyOwner {
        canStartMint = true;
        lastTimeMinted = block.timestamp;
    }

    function enableUpgrade() public onlyOwner {
        canUpgradeStand = true;
    }

    function updateStakingContract(address _stakingContract) public onlyOwner {
        stakingContract = _stakingContract;
    }

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

    /// @notice Allows the contract deployer to set the metadata URI.
    /// @param _baseURI The new metadata URI.
    function setBaseURI(string memory _baseURI) public onlyOwner {
        baseURI = _baseURI;
    }

    function tokenURI(uint256 id) public view override returns (string memory) {
        return string(abi.encodePacked(baseURI, id.toString()));
    }

    /*///////////////////////////////////////////////////////////////
                        REVERSE-DUTCH AUCTION LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @notice Calculates the mint price with the accumulated rate deduction since the mint's started. Every hour there is no mint the price goes down 100 tokens. After every mint the price goes up 100 tokens.
    /// @return The mint price at the current time, or 0 if the deductions are greater than the mint's start price.
    function getCurrentTokenPrice() public view returns (uint) {
        uint priceReduction = ((block.timestamp - lastTimeMinted) / reductionTime) * 25 * 10**18;
        return currentLemonStandPrice >= priceReduction ? (currentLemonStandPrice - priceReduction) :  25 * 10**18;
    }

    /// @notice Purchases a LemonApeStand NFT in the reverse-dutch auction
    /// @param amountToMint the amount of NFTs to mint in one transcation.
    function mint(uint256 amountToMint) public {
        if(!canStartMint) revert MintNotStarted();
        uint price = getCurrentTokenPrice();
        if(IERC20(lasToken).balanceOf(msg.sender) < price * amountToMint) revert ValueTooLow();
        if(amountToMint > mintLimit) revert MintingTooMany();
        if(totalSupply() + amountToMint > lemonStandTotalSupply) revert MintedOut();
        //to save gas we calcualte the amount of $LAS token needed to mint the amount of NFTs a user has selected
        IERC20(lasToken).transferFrom(msg.sender, stakingContract, price * amountToMint);
        for (uint256 i = 0; i < amountToMint; i++) {
            uint256 mintIndex = totalSupply();
            _mint(msg.sender, mintIndex);
            unchecked {
                lemonStandSupply++;
            }
        }
        //to save gas we calcualte the currentLemonStandPrice after the minting loop
        lastTimeMinted = block.timestamp;
        currentLemonStandPrice += amountToMint * 25 * 10**18;
    }

    /*///////////////////////////////////////////////////////////////
                        UPGRADE LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @notice Mints an upgraded LemonApe Stand
    /// @param receiver Receiver of the upgraded LemonApe Stand
    /// @param standIdToUpgrade The upgrade (2-4) that the LemonApeStand NFT is undergoing
    function mintUpgradedStand(address receiver, uint standIdToUpgrade) public {
        if(!canUpgradeStand) revert UpgradeNotStarted();
        uint upgradeToStand;
        if(standIdToUpgrade <= lemonStandTotalSupply - 1){
            upgradeToStand = 2;
        } else if(standIdToUpgrade <= lemonStandTotalSupply + grapeStandTotalSupply - 1){
            upgradeToStand = 3;
        } else if(standIdToUpgrade <= lemonStandTotalSupply + grapeStandTotalSupply + dragonStandTotalSupply - 1){
            upgradeToStand = 4;
        } else {
            revert UnknownUpgrade();
        }

        if (upgradeToStand == 2) {
            if(grapeStandSupply >= grapeStandTotalSupply) revert MintedOut();
            if(IERC20(potionToken).balanceOf(msg.sender) < 1 * 10**18) revert ValueTooLow();
            if(!isExistVersionOfNFT(receiver, 1)) revert MissingPreviousNFT();
            IERC20(potionToken).transferFrom(msg.sender, stakingContract, 1 * 10**18);
            _mint(receiver, grapeStandOffset + grapeStandSupply);
            unchecked {
                grapeStandSupply++;
            }
        } else if (upgradeToStand == 3) {
            if(dragonStandSupply >= dragonStandTotalSupply) revert MintedOut();
            if(IERC20(potionToken).balanceOf(msg.sender) < 2 * 10**18) revert ValueTooLow();
            if(!isExistVersionOfNFT(receiver, 2)) revert MissingPreviousNFT();
            IERC20(potionToken).transferFrom(msg.sender, stakingContract, 2 * 10**18);
            _mint(receiver, dragonStandOffset + dragonStandSupply);
            unchecked {
                dragonStandSupply++;
            }
        } else if (upgradeToStand == 4) {
            if(fourTwentyStandSupply >= fourTwentyStandTotalSupply) revert MintedOut();
            if(IERC20(potionToken).balanceOf(msg.sender) < 3 * 10**18) revert ValueTooLow();
            if(!isExistVersionOfNFT(receiver, 3)) revert MissingPreviousNFT();
            IERC20(potionToken).transferFrom(msg.sender, stakingContract, 3 * 10**18);
            _mint(receiver, fourTwentyStandOffset + fourTwentyStandSupply);
            unchecked {
                fourTwentyStandSupply++;
            }
        } else  {
            revert UnknownUpgrade();
        }
    }
    /*///////////////////////////////////////////////////////////////
        This is a function to check what version NFT 
    //////////////////////////////////////////////////////////////*/

    /// @notice Mints an upgraded LemonApe Stand
    /// @param id Id of the NFT
    /// @return version of the NFT

    function getVersionFromNFTId(uint id) public pure returns (uint version) 
    {

        if(id<=lemonStandTotalSupply - 1){
            return 1;
        }
        else if(id<=lemonStandTotalSupply + grapeStandTotalSupply - 1){
            return 2;
        }
        else if(id<=lemonStandTotalSupply + grapeStandTotalSupply + dragonStandTotalSupply - 1)
        {
            return 3;
        }
        else if(id<=lemonStandTotalSupply + grapeStandTotalSupply + dragonStandTotalSupply + fourTwentyStandTotalSupply - 1){
            return 4;
        }
        else{
            return 0;
        }
    }
    function walletOfOwner(address _owner) public view returns(uint256[] memory) {
        uint256 tokenCount = balanceOf(_owner);

        uint256[] memory tokensId = new uint256[](tokenCount);
        for(uint256 i; i < tokenCount; i++){
            tokensId[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokensId;
    }
    /// Check if the user has version of the NFT
    /// @param _owner Address of the selected user
    /// @param version Version Number of the NFT to check if user has
    /// @return isExist true if it's exist
    function isExistVersionOfNFT(address _owner, uint version) public view returns (bool isExist) {
        uint256[] memory tokensId;
        tokensId = walletOfOwner(_owner);
        for (uint256 i = 0; i < tokensId.length; i++) {
            if (getVersionFromNFTId(tokensId[i])==version) return true;
        }
        return false;
    }

}

// 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 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/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/Context.sol)

pragma solidity ^0.8.0;

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

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

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

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

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

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

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

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

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

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

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

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

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

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

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

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

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

// 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 v4.6.0) (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 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 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/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 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 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 || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits 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 (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);
    }
}

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

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-----Decoded View---------------
Arg [0] : _baseURI (string): https://ipfs.io/ipfs/QmXqSn8zyf9eeF6q6gp6gWkvUVHhwer3sxLTbTkxneFr7G/
Arg [1] : dropLemonStands (address[]): 0xEA44bc914bED9F63Ee90203126cf5b5677E7600F,0xA053DbaFbA05E307a7BdDedE09C7FEB235dC34b1,0xA62f3FcD3A40bfF115029252e0a9b1b9D391fbD8,0x05b41dc849615bB44161bdB8121478b5c85e1f39,0x5c3A272BDFaB9A7fAbe6bF12a11A59597a59A208,0x7d3FF148A617b66b3f5141199db39f08FDCD3556,0x52A3F6293c9846f6A3B03Be62929E16f2F856f3D,0x9B7c2E90C37b99a2AC200B3884972BCF8F8FcE85,0xFb8578ba5ba33C0aadaFe1b0454FAb15417eE74a,0xdec08cb92a506B88411da9Ba290f3694BE223c26,0x9bDA3a3B397eCcD43cdc5598ed771006551D7066,0x83ACa1a0A3Ca63aB19e4A146Aa2ED2f120911b15,0x7D00856F70b6743CDD427BCA6B5162822B07F162,0xDE9E78b8d74488c58b7553C4eDcFE583ddD4a8DD,0xC2Fe0D5F88CDa8cb2C91459269B2a91915d95Cf8,0x50d34c90866cc4113964bF80db991A34D7746044,0xD1EAce521e79ECFC08f0E85cccfA206DDA8084F2,0x39E60458426d26C27d8A6A767697Abf2796D228A,0xb35CC9d60a0E7Cea677234d1Ae1564F6ae71B6A4,0x9221F32dDD2105299bfD95FB7E12441b3bE6CB43,0x7Cba48ad447fA115d1C0662DA389d91Ea3E4C135,0xA3eb090Ab0F71829432D39695ADc60C423cc0E9c,0xb30D955Afc668EaB195f271D746484928A52cd49,0x557Bc1207A7B0dC5f88EBC72Cd1d8502C372c04a,0x653325aFDb00DD741Fee25a694467eBA17E8e93D,0xEe469320317eC1E3C23582a64FA3be655edF26d5,0x925E26dA09dC91C27ca4F7dcc6b91549aC19672c,0xC4ba11BDD9884EA6c107FBA66AB71D3cF3829b0F,0x28b6d2ece66c20B682d5E461FfCb2cd0011F3416,0xA5fa1a4Faf0914cAC20ae80e7700aC220cb139eb,0xCFdCD073df77FB89884193Bb25C8Fa167Aa56571,0x0dDec074e0E0AE21bE8F9244C4CA92a48f4e6Ed6,0x6f61534a43e73858Dab092bFf66B814AB2fbec6b,0x668e343a48b679100be85924cFBaF5Ecf243A254,0x08bAE65e21B408Ba4A1B6317B758DF41E0150bB4,0xD9C183cCc168c4a702d2beA931D6E89cd6a0d758,0x5bAE2fE8d641F2BdF88994937E5DBa87Eb29AfC1,0x55643fD1c1417C06690b298611408C9E5405AA81

-----Encoded View---------------
45 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000044
Arg [3] : 68747470733a2f2f697066732e696f2f697066732f516d5871536e387a796639
Arg [4] : 65654636713667703667576b76555648687765723373784c5462546b786e6546
Arg [5] : 7237472f00000000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000026
Arg [7] : 000000000000000000000000ea44bc914bed9f63ee90203126cf5b5677e7600f
Arg [8] : 000000000000000000000000a053dbafba05e307a7bddede09c7feb235dc34b1
Arg [9] : 000000000000000000000000a62f3fcd3a40bff115029252e0a9b1b9d391fbd8
Arg [10] : 00000000000000000000000005b41dc849615bb44161bdb8121478b5c85e1f39
Arg [11] : 0000000000000000000000005c3a272bdfab9a7fabe6bf12a11a59597a59a208
Arg [12] : 0000000000000000000000007d3ff148a617b66b3f5141199db39f08fdcd3556
Arg [13] : 00000000000000000000000052a3f6293c9846f6a3b03be62929e16f2f856f3d
Arg [14] : 0000000000000000000000009b7c2e90c37b99a2ac200b3884972bcf8f8fce85
Arg [15] : 000000000000000000000000fb8578ba5ba33c0aadafe1b0454fab15417ee74a
Arg [16] : 000000000000000000000000dec08cb92a506b88411da9ba290f3694be223c26
Arg [17] : 0000000000000000000000009bda3a3b397eccd43cdc5598ed771006551d7066
Arg [18] : 00000000000000000000000083aca1a0a3ca63ab19e4a146aa2ed2f120911b15
Arg [19] : 0000000000000000000000007d00856f70b6743cdd427bca6b5162822b07f162
Arg [20] : 000000000000000000000000de9e78b8d74488c58b7553c4edcfe583ddd4a8dd
Arg [21] : 000000000000000000000000c2fe0d5f88cda8cb2c91459269b2a91915d95cf8
Arg [22] : 00000000000000000000000050d34c90866cc4113964bf80db991a34d7746044
Arg [23] : 000000000000000000000000d1eace521e79ecfc08f0e85cccfa206dda8084f2
Arg [24] : 00000000000000000000000039e60458426d26c27d8a6a767697abf2796d228a
Arg [25] : 000000000000000000000000b35cc9d60a0e7cea677234d1ae1564f6ae71b6a4
Arg [26] : 0000000000000000000000009221f32ddd2105299bfd95fb7e12441b3be6cb43
Arg [27] : 0000000000000000000000007cba48ad447fa115d1c0662da389d91ea3e4c135
Arg [28] : 000000000000000000000000a3eb090ab0f71829432d39695adc60c423cc0e9c
Arg [29] : 000000000000000000000000b30d955afc668eab195f271d746484928a52cd49
Arg [30] : 000000000000000000000000557bc1207a7b0dc5f88ebc72cd1d8502c372c04a
Arg [31] : 000000000000000000000000653325afdb00dd741fee25a694467eba17e8e93d
Arg [32] : 000000000000000000000000ee469320317ec1e3c23582a64fa3be655edf26d5
Arg [33] : 000000000000000000000000925e26da09dc91c27ca4f7dcc6b91549ac19672c
Arg [34] : 000000000000000000000000c4ba11bdd9884ea6c107fba66ab71d3cf3829b0f
Arg [35] : 00000000000000000000000028b6d2ece66c20b682d5e461ffcb2cd0011f3416
Arg [36] : 000000000000000000000000a5fa1a4faf0914cac20ae80e7700ac220cb139eb
Arg [37] : 000000000000000000000000cfdcd073df77fb89884193bb25c8fa167aa56571
Arg [38] : 0000000000000000000000000ddec074e0e0ae21be8f9244c4ca92a48f4e6ed6
Arg [39] : 0000000000000000000000006f61534a43e73858dab092bff66b814ab2fbec6b
Arg [40] : 000000000000000000000000668e343a48b679100be85924cfbaf5ecf243a254
Arg [41] : 00000000000000000000000008bae65e21b408ba4a1b6317b758df41e0150bb4
Arg [42] : 000000000000000000000000d9c183ccc168c4a702d2bea931d6e89cd6a0d758
Arg [43] : 0000000000000000000000005bae2fe8d641f2bdf88994937e5dba87eb29afc1
Arg [44] : 00000000000000000000000055643fd1c1417c06690b298611408c9e5405aa81