// File: contracts/MarmottoshisIsERC1155.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "./IMarmottoshisIsERC1155.sol";
import "./ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Base64.sol";
import "@openzeppelin/contracts/token/common/ERC2981.sol";

contract MarmottoshisIsERC1155 is IMarmottoshisIsERC1155, ERC1155, ERC2981, Ownable, ReentrancyGuard {

    string public name = "Marmottoshis";
    string public symbol = "WASAT";

    using Strings for uint;

    Step public currentStep;

    uint public constant maxToken = 21; // 21 different NFTs
    uint public constant maxSupply = 37; // 37 copies of each NFT

    uint public reservationPrice = 0.01727 ether; // Price of the reservation (21 USD ATM)
    uint public reservationNFTPrice = 0.04663 ether; // Price of the NFT for reservation list (56.7 USD ATM)
    uint public whitelistPrice = 0.0639 ether; // Price of whitelist mint (77.7 USD ATM)
    uint public publicPrice = 0.0639 ether; // Price of public mint (77.7 USD ATM)

    uint public balanceOfSatoshis = 0; // Balance of Satoshis (100000000 Satoshis = 1 Bitcoin)

    uint public currentReservationNumber = 0; // Current number of reservations purchased

    bytes32 public freeMintMerkleRoot; // Merkle root of the free mint
    bytes32 public firstMerkleRoot; // Merkle root of the first whitelist
    bytes32 public secondMerkleRoot; // Merkle root of the second whitelist

    mapping(uint => Metadata) public metadataById; // Artist by ID
    mapping(uint => uint) public supplyByID; // Number of NFTs minted by ID
    mapping(address => bool) public reservationList; // List of addresses that reserved (true = reserved)

    mapping(address => uint) public freeMintByWallet; // Number of NFTs minted by wallet for free mint
    mapping(address => uint) public reservationMintByWallet; // Number of reserved NFT mint by wallet
    mapping(address => uint) public firstWhitelistMintByWallet; // Number of first whitelist NFT mint by wallet
    mapping(address => uint) public secondWhitelistMintByWallet; // Number of second whitelist NFT mint by wallet

    mapping(uint => uint) public balanceOfSatoshiByID; // Balance of Satoshi by token ID

    address public marmott; // Marmott's address

    bool public isMetadataLocked = false; // Locks the metadata URI
    bool public isRevealed = false; // Reveal the NFTs

    constructor(address _marmott, string memory _uri) ERC1155(_uri) {
        marmott = _marmott;
    }

    // @dev see {IMarmottoshisIsERC1155-mint}
    function mint(uint idToMint, bytes32[] calldata _proof) public payable nonReentrant {
        require(
            currentStep == Step.FreeMint ||
            currentStep == Step.ReservationMint ||
            currentStep == Step.FirstWhitelistMint ||
            currentStep == Step.SecondWhitelistMint ||
            currentStep == Step.PublicMint
        , "Sale is not open");
        require(idToMint >= 1, "Nonexistent id");
        require(idToMint <= maxToken, "Nonexistent id");
        require(supplyByID[idToMint] + 1 <= maxSupply, "Max supply exceeded for this id");

        if (currentStep == Step.FreeMint) {
            require(isOnList(msg.sender, _proof, 0), "Not on free mint list");
            require(totalSupply() + 1 <= 77, "Max free mint supply exceeded");
            require(freeMintByWallet[msg.sender] + 1 <= 1, "You already minted your free NFT");
            freeMintByWallet[msg.sender] += 1;
            _mint(msg.sender, idToMint, 1, "");
        } else if (currentStep == Step.ReservationMint) {
            require(reservationList[msg.sender], "Not on reservation list");
            require(msg.value >= reservationNFTPrice, "Not enough ether");
            require(totalSupply() + 1 <= 477, "Max reservation mint supply exceeded");
            require(reservationMintByWallet[msg.sender] + 1 <= 1, "You already minted your reserved NFT");
            reservationMintByWallet[msg.sender] += 1;
            _mint(msg.sender, idToMint, 1, "");
        } else if (currentStep == Step.FirstWhitelistMint) {
            require(isOnList(msg.sender, _proof, 1), "Not on first whitelist");
            require(msg.value >= whitelistPrice, "Not enough ether");
            require(totalSupply() + 1 <= 577, "Max first whitelist mint supply exceeded");
            require(firstWhitelistMintByWallet[msg.sender] + 1 <= 1, "You already minted your first whitelist NFT");
            firstWhitelistMintByWallet[msg.sender] += 1;
            _mint(msg.sender, idToMint, 1, "");
        } else if (currentStep == Step.SecondWhitelistMint) {
            require(isOnList(msg.sender, _proof, 2), "Not on second whitelist");
            require(msg.value >= whitelistPrice, "Not enough ether");
            require(totalSupply() + 1 <= 777, "Max second whitelist mint supply exceeded");
            require(secondWhitelistMintByWallet[msg.sender] + 1 <= 1, "You already minted your second whitelist NFT");
            secondWhitelistMintByWallet[msg.sender] += 1;
            _mint(msg.sender, idToMint, 1, "");
        } else {
            require(msg.value >= publicPrice, "Not enough ether");
            require(totalSupply() + 1 <= 777, "Sold out");
            _mint(msg.sender, idToMint, 1, "");
        }
        supplyByID[idToMint]++;
        emit newMint(msg.sender, idToMint);
    }

    // @dev see {IMarmottoshisIsERC1155-updateStep}
    function updateStep(Step _step) external onlyOwner {
        currentStep = _step;
        emit stepUpdated(currentStep);
    }

    // @dev see {IMarmottoshisIsERC1155-updateMarmott}
    function updateMarmott(address _marmott) external {
        require(msg.sender == marmott || msg.sender == owner(), "Only Marmott or owner can update Marmott");
        marmott = _marmott;
    }

    // @dev see {IMarmottoshisIsERC1155-lockMetadata}
    function lockMetadata() external onlyOwner {
        isMetadataLocked = true;
    }

    // @dev see {IMarmottoshisIsERC1155-reveal}
    function reveal() external onlyOwner {
        isRevealed = true;
    }

    // @dev see {IMarmottoshisIsERC1155-updateURI}
    function updateURI(string memory _newUri) external onlyOwner {
        require(!isMetadataLocked, "Metadata locked");
        _uri = _newUri;
    }

    // @dev see {IMarmottoshisIsERC1155-addSats}
    function addSats(uint satoshis) external {
        require(msg.sender == marmott, "Only Marmott can add BTC");
        balanceOfSatoshis = balanceOfSatoshis + satoshis;
        uint divedBy = getNumberOfIdLeft();
        require(divedBy > 0, "No NFT left");
        uint satoshisPerId = satoshis / divedBy;
        for (uint i = 1; i <= maxToken; i++) {
            if (supplyByID[i] > 0) {
                balanceOfSatoshiByID[i] = balanceOfSatoshiByID[i] + satoshisPerId;
            }
        }
    }

    // @dev see {IMarmottoshisIsERC1155-subSats}
    function subSats(uint satoshis) external {
        require(msg.sender == marmott, "Only Marmott can sub BTC");
        require(balanceOfSatoshis >= satoshis, "Not enough satoshis in balance to sub");
        balanceOfSatoshis = balanceOfSatoshis - satoshis;
        uint divedBy = getNumberOfIdLeft();
        require(divedBy > 0, "No NFT left");
        uint satoshisPerId = satoshis / divedBy;
        for (uint i = 1; i <= maxToken; i++) {
            if (supplyByID[i] > 0) {
                require(balanceOfSatoshiByID[i] >= satoshisPerId, "Not enough satoshis in balance to sub (by id)");
                balanceOfSatoshiByID[i] = balanceOfSatoshiByID[i] - satoshisPerId;
            }
        }
    }

    // @dev see {IMarmottoshisIsERC1155-burnAndRedeem}
    function burnAndRedeem(uint _idToRedeem, string memory _btcAddress) public nonReentrant {
        require(_idToRedeem >= 1, "Nonexistent id");
        require(_idToRedeem <= maxToken, "Nonexistent id");
        require(currentStep == Step.SoldOut, "You can't redeem satoshis yet");
        require(balanceOf(msg.sender, _idToRedeem) >= 1, "Not enough Marmottoshis to burn");
        _burn(msg.sender, _idToRedeem, 1);
        uint satoshisToRedeem = redeemableById(_idToRedeem);
        require(satoshisToRedeem > 0, "No satoshi to redeem");
        balanceOfSatoshis = balanceOfSatoshis - satoshisToRedeem;
        balanceOfSatoshiByID[_idToRedeem] = balanceOfSatoshiByID[_idToRedeem] - satoshisToRedeem;
        supplyByID[_idToRedeem] = supplyByID[_idToRedeem] - 1;
        emit newRedeemRequest(msg.sender, _idToRedeem, 1, _btcAddress, satoshisToRedeem);
    }

    // @dev see {IMarmottoshisIsERC1155-reservationForWhitelist}
    function reservationForWhitelist() external payable nonReentrant {
        require(currentStep == Step.WLReservation, "Reservation for whitelist is not open");
        require(msg.value >= reservationPrice, "Not enough ether");
        require(reservationList[msg.sender] == false, "You are already in the pre-whitelist");
        require(currentReservationNumber + 1 <= 400, "Max pre-whitelist reached");
        currentReservationNumber = currentReservationNumber + 1;
        reservationList[msg.sender] = true;
        emit newReservation(msg.sender);
    }

    // @dev see {IMarmottoshisIsERC1155-redeemableById}
    function redeemableById(uint _id) public view returns (uint) {
        if (supplyByID[_id] == 0) {
            return 0;
        } else {
            return balanceOfSatoshiByID[_id] / supplyByID[_id];
        }
    }

    // @dev see {IMarmottoshisIsERC1155-getNumberOfIdLeft}
    function getNumberOfIdLeft() public view returns (uint) {
        uint numberOfIdLeft = 0;
        for (uint i = 1; i <= maxToken; i++) {
            if (supplyByID[i] > 0) {
                numberOfIdLeft = numberOfIdLeft + 1;
            }
        }
        return numberOfIdLeft;
    }

    // @dev see {IMarmottoshisIsERC1155-addMetadata}
    function addMetadata(uint[] memory _id, string[] memory _artists_names, string[] memory _marmot_name, string[] memory _links, string[] memory _uri) external onlyOwner {
        require(!isMetadataLocked, "Metadata locked");
        for (uint i = 0; i < _id.length; i++) {
            metadataById[_id[i]] = Metadata({
                id: _id[i],
                artist_name: _artists_names[i],
                marmot_name: _marmot_name[i],
                link: _links[i],
                uri: _uri[i]
            });
        }
    }

    // @dev see {IMarmottoshisIsERC1155-updateFreeMintMerkleRoot}
    function updateFreeMintMerkleRoot(bytes32 _merkleRoot) external onlyOwner {
        freeMintMerkleRoot = _merkleRoot;
    }

    // @dev see {IMarmottoshisIsERC1155-updateFirstWhitelistMerkleRoot}
    function updateFirstWhitelistMerkleRoot(bytes32 _merkleRoot) external onlyOwner {
        firstMerkleRoot = _merkleRoot;
    }

    // @dev see {IMarmottoshisIsERC1155-updateSecondWhitelistMerkleRoot}
    function updateSecondWhitelistMerkleRoot(bytes32 _merkleRoot) external onlyOwner {
        secondMerkleRoot = _merkleRoot;
    }

    // @dev see {IMarmottoshisIsERC1155-updateReservationPrice}
    function updateReservationPrice(uint _reservationPrice) external onlyOwner {
        reservationPrice = _reservationPrice;
    }

    // @dev see {IMarmottoshisIsERC1155-updateReservationNFTPrice}
    function updateReservationNFTPrice(uint _reservationNFTPrice) external onlyOwner {
        reservationNFTPrice = _reservationNFTPrice;
    }

    // @dev see {IMarmottoshisIsERC1155-updateWLPrice}
    function updateWLPrice(uint _whitelistPrice) external onlyOwner {
        whitelistPrice = _whitelistPrice;
    }

    // @dev see {IMarmottoshisIsERC1155-updatePublicPrice}
    function updatePublicPrice(uint _publicPrice) external onlyOwner {
        publicPrice = _publicPrice;
    }

    // @dev see {IERC1155MetadataURI-uri}
    function uri(uint256 _tokenId) override public view returns (string memory) {
        require(_tokenId >= 1, "Nonexistent id");
        require(_tokenId <= maxToken, "Nonexistent id");
        if (!isRevealed) {
            return _uri;
        }
        string memory image = metadataById[_tokenId].uri;
        string memory marmot_name = metadataById[_tokenId].marmot_name;
        string memory json = Base64.encode(
            bytes(
                string(
                    abi.encodePacked(
                        '{"name": "', marmot_name, '", "image": "', image, '", "description": "Realised by ', metadataById[_tokenId].artist_name, '. You can see more here : ', metadataById[_tokenId].link, ' .", "attributes": [{"trait_type": "Satoshis", "value": "', redeemableById(_tokenId).toString(), '"}, {"trait_type": "Remaining Copy", "value": "', supplyByID[_tokenId].toString(), '"}]}'
                    )
                )
            )
        );

        return string(abi.encodePacked('data:application/json;base64,', json));
    }

    // @dev see {IMarmottoshisIsERC1155-totalSupply}
    function totalSupply() public view returns (uint) {
        uint supply = 0;
        for (uint i = 1; i <= maxToken; i++) {
            supply = supply + supplyByID[i];
        }
        return supply;
    }

    // @dev see {IMarmottoshisIsERC1155-withdraw}
    function withdraw() external onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }

    // @dev see {IMarmottoshisIsERC1155-isOnList}
    function isOnList(address _account, bytes32[] calldata _proof, uint _step) public view returns (bool) {
        if (_step == 0) {
            return _verify(_leaf(_account), _proof, freeMintMerkleRoot);
        } else if (_step == 1) {
            return _verify(_leaf(_account), _proof, firstMerkleRoot);
        } else if (_step == 2) {
            return _verify(_leaf(_account), _proof, secondMerkleRoot);
        } else {
            return false;
        }
    }

    function _leaf(address _account) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(_account));
    }

    function _verify(bytes32 leaf, bytes32[] memory proof, bytes32 root) internal pure returns (bool) {
        return MerkleProof.verify(proof, root, leaf);
    }


    // @dev see {IERC165-supportsInterface}.
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC1155, ERC2981) returns (bool) {
        return super.supportsInterface(interfaceId);
    }

    // @dev see {IMarmottoshisIsERC1155-setDefaultRoyalty}
    function setDefaultRoyalty(address receiver, uint96 feeNumerator) external onlyOwner {
        _setDefaultRoyalty(receiver, feeNumerator);
    }
}

// File: contracts/IMarmottoshisIsERC1155.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface IMarmottoshisIsERC1155 {

    // @notice Structure to store artist's infos (by token ID)
    struct Metadata {
        uint id;
        string artist_name;
        string marmot_name;
        string link;
        string uri;
    }

    // @notice Enum of different steps of the contract process
    enum Step {
        SaleNotStarted,
        WLReservation,
        FreeMint,
        ReservationMint,
        FirstWhitelistMint,
        SecondWhitelistMint,
        PublicMint,
        SoldOut
    }

    event newReservation(address indexed sender); // New reservation
    event newRedeemRequest(address indexed sender, uint256 nftIdRedeemed, uint256 burnAmount, string btcAddress, uint256 satoshisAmount); // Redeem event (user want to claim sats)
    event newMint(address indexed sender, uint256 nftIdMinted); // New mint
    event stepUpdated(Step currentStep); // Step updated

    // @notice Returns the sum of all supplies for each NFT ID
    function totalSupply() external view returns (uint256);

    // @notice return max supply of NFTs
    function maxSupply() external view returns (uint256);

    // @notice return max token by NFT Id
    function maxToken() external view returns (uint256);

    /*
    * @notice return supply by ID of NFT
    * @param _tokenId : id of NFT
    */
    function supplyByID(uint256) external view returns (uint256);

    /*
    * @notice get number of Satoshis redeemable by NFT ID
    * @param uint : id of NFT
    */
    function redeemableById(uint256 _id) external view returns (uint256);

    /*
    * @notice get number of NFT's ID with supply left
    */
    function getNumberOfIdLeft() external view returns (uint256);

    // @notice return free mint merkle root
    function freeMintMerkleRoot() external view returns (bytes32);

    // @notice return first whitelist merkle root
    function firstMerkleRoot() external view returns (bytes32);

    // @notice return second whitelist merkle root
    function secondMerkleRoot() external view returns (bytes32);

    /*
    * @notice return if a user is in reservation list (true/false)
    * @param _account : address of user
    */
    function reservationList(address) external view returns (bool);

    /*
    * @notice return number of NFTs minted by user for reservation step
    * @param _account : address of user
    */
    function reservationMintByWallet(address) external view returns (uint256);

    /*
    * @notice return number of NFTs minted by user for free mint step
    * @param _account : address of user
    */
    function freeMintByWallet(address) external view returns (uint256);

    /*
    * @notice return number of NFTs minted by user for first whitelist step
    * @param _account : address of user
    */
    function firstWhitelistMintByWallet(address) external view returns (uint256);

    /*
    * @notice return number of NFTs minted by user for second whitelist step
    * @param _account : address of user
    */
    function secondWhitelistMintByWallet(address) external view returns (uint256);

    /*
    * @notice know if user is on a list
    * @param _account : address of user
    * @param _proof : Merkle proof
    * @param _step : step of the list (0 = free mint, 1 = first whitelist, 2 = second whitelist)
    */
    function isOnList(address _account, bytes32[] calldata _proof, uint256 _step) external view returns (bool);

    // @notice return reservation price
    function reservationPrice() external view returns (uint256);

    // @notice return reservation mint price
    function reservationNFTPrice() external view returns (uint256);

    // @notice return whitelist mint price (first and second)
    function whitelistPrice() external view returns (uint256);

    // @notice return public mint price
    function publicPrice() external view returns (uint256);

    // @notice return current reservation number
    function currentReservationNumber() external view returns (uint256);

    // @notice return balance of Satoshis of this contract
    function balanceOfSatoshis() external view returns (uint256);

    /*
    * @notice return balance infos by NFT Id
    * @param _tokenId : id of NFT
    */
    function balanceOfSatoshiByID(uint256) external view returns (uint256);

    /*
    * @notice return metadata infos by NFT Id
    * @param _tokenId : id of NFT
    */
    function metadataById(uint256) external view returns (uint id, string memory artist_name, string memory marmot_name, string memory link, string memory uri);

    // @notice return current step
    function currentStep() external view returns (Step);

    // @notice return if metadata are locked (true/false)
    function isMetadataLocked() external view returns (bool);

    // @notice return if NFT are revealed (true/false)
    function isRevealed() external view returns (bool);

    // @notice return marmott address
    function marmott() external view returns (address);

    ////////// Functions //////////
    /// Setter functions ///

    /*
    * @notice Mints a new token to msg.sender
    * @param uint : Id of NFT to mint.
    * @param bytes32[] : Proof of whitelist (could be empty []).
    */
    function mint(uint256 idToMint, bytes32[] calldata _proof) external payable;

    /*
    * @notice update step
    * @param _step step to update
    */
    function updateStep(Step _step) external;

    /*
    * @notice update Marmott's address
    * @param address : new Marmott's address
    */
    function updateMarmott(address _marmott) external;

    /*
    * @notice lock metadata
    */
    function lockMetadata() external;

    /*
    * @notice reveal NFTs
    */
    function reveal() external;

    /*
    * @notice update URI
    * @param string : new URI
    */
    function updateURI(string memory _newUri) external;

    /*
    * @notice create Metadata struct of an NFT and add it in metadataById mapping
    * @param uint[] : array of NFT Ids
    * @param string[] : array of artist names
    * @param string[] : array of marmot names
    * @param string[] : array of links
    * @param string[] : array of URIs
    */
    function addMetadata(uint[] calldata _id, string[] calldata _artists_names, string[] calldata _marmot_name, string[] calldata _links, string[] calldata _uri) external;

    /*
    * @notice add satoshis to balanceOfSatoshis
    * @param uint : amount of satoshis to add
    */
    function addSats(uint256 satoshis) external;

    /*
    * @notice remove satoshis from balanceOfSatoshis
    * @param uint : amount of satoshis to remove
    */
    function subSats(uint256 satoshis) external;

    /*
    * @notice redeem satoshis and burn NFT
    * @param uint : id of NFT to burn/redeem
    * @param string : bitcoin address to send satoshis to
    */
    function burnAndRedeem(uint256 _idToRedeem, string memory _btcAddress) external;

    /*
    * @notice function for user to be preWhitelist
    */
    function reservationForWhitelist() external payable;

    /*
    * @notice update first whitelist merkle root
    * @param _merkleRoot : new merkle root
    */
    function updateFirstWhitelistMerkleRoot(bytes32 _merkleRoot) external;

    /*
    * @notice update free mint merkle root
    * @param _merkleRoot : new merkle root
    */
    function updateFreeMintMerkleRoot(bytes32 _merkleRoot) external;

    /*
    * @notice update public price
    * @param _publicPrice : new public price
    */
    function updatePublicPrice(uint256 _publicPrice) external;

    /*
    * @notice update reservation NFT price
    * @param _reservationNFTPrice : new reservation NFT price
    */
    function updateReservationNFTPrice(uint256 _reservationNFTPrice) external;

    /*
    * @notice update reservation price
    * @param _reservationPrice : new reservation price
    */
    function updateReservationPrice(uint256 _reservationPrice) external;

    /*
    * @notice update second whitelist merkle root
    * @param _merkleRoot : new merkle root
    */
    function updateSecondWhitelistMerkleRoot(bytes32 _merkleRoot) external;

    /*
    * @notice update whitelist price
    * @param _whitelistPrice : new whitelist price
    */
    function updateWLPrice(uint256 _whitelistPrice) external;

    /*
    * @notice withdraw ether from contract
    */
    function withdraw() external;

    // @notice EIP2981 royalties
    function setDefaultRoyalty(address receiver, uint96 feeNumerator) external;
}

// File: contracts/ERC1155/ERC1155.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/ERC1155.sol)

pragma solidity ^0.8.0;

import "./IERC1155.sol";
import "./extensions/IERC1155MetadataURI.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

/**
 * @dev Implementation of the basic standard multi-token.
 * See https://eips.ethereum.org/EIPS/eip-1155
 * Originally based on code by Enjin: https://github.com/enjin/erc-1155
 *
 * _Available since v3.1._
 */
contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
    using Address for address;

    // Mapping from token ID to account balances
    mapping(uint256 => mapping(address => uint256)) private _balances;

    // Mapping from account to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
    string internal _uri;

    /**
     * @dev See {_setURI}.
     */
    constructor(string memory uri_) {
        _setURI(uri_);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
        interfaceId == type(IERC1155).interfaceId ||
        interfaceId == type(IERC1155MetadataURI).interfaceId ||
        super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC1155MetadataURI-uri}.
     *
     * This implementation returns the same URI for *all* token types. It relies
     * on the token type ID substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * Clients calling this function must replace the `\{id\}` substring with the
     * actual token type ID.
     */
    function uri(uint256) public view virtual override returns (string memory) {
        return _uri;
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: address zero is not a valid owner");
        return _balances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
    public
    view
    virtual
    override
    returns (uint256[] memory)
    {
        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[account][operator];
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not token owner or approved"
        );
        _safeTransferFrom(from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not token owner or approved"
        );
        _safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(to != address(0x000000000000000000000000000000000000dEaD), "You should use burnAndRedeem function");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
    unchecked {
        _balances[id][from] = fromBalance - amount;
    }
        _balances[id][to] += amount;

        emit TransferSingle(operator, from, to, id, amount);

        _afterTokenTransfer(operator, from, to, ids, amounts, data);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(to != address(0x000000000000000000000000000000000000dEaD), "You should use burnAndRedeem function");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }
            _balances[id][to] += amount;
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _afterTokenTransfer(operator, from, to, ids, amounts, data);

        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    /**
     * @dev Sets a new URI for all token types, by relying on the token type ID
     * substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * By this mechanism, any occurrence of the `\{id\}` substring in either the
     * URI or any of the amounts in the JSON file at said URI will be replaced by
     * clients with the token type ID.
     *
     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
     * interpreted by clients as
     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
     * for token type ID 0x4cce0.
     *
     * See {uri}.
     *
     * Because these URIs cannot be meaningfully represented by the {URI} event,
     * this function emits no events.
     */
    function _setURI(string memory newuri) internal virtual {
        _uri = newuri;
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        _balances[id][to] += amount;
        emit TransferSingle(operator, address(0), to, id, amount);

        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);

        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _mintBatch(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] += amounts[i];
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);

        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `from`
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `from` must have at least `amount` tokens of token type `id`.
     */
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
    unchecked {
        _balances[id][from] = fromBalance - amount;
    }

        emit TransferSingle(operator, from, address(0), id, amount);

        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }
        }

        emit TransferBatch(operator, from, address(0), ids, amounts);

        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC1155: setting approval status for self");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `ids` and `amounts` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155Receiver.onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non-ERC1155Receiver implementer");
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                bytes4 response
            ) {
                if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non-ERC1155Receiver implementer");
            }
        }
    }

    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the merkle tree could be reinterpreted as a leaf value.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = _efficientHash(computedHash, proofElement);
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/Base64.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Base64.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides a set of functions to operate with Base64 strings.
 *
 * _Available since v4.5._
 */
library Base64 {
    /**
     * @dev Base64 Encoding/Decoding Table
     */
    string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /**
     * @dev Converts a `bytes` to its Bytes64 `string` representation.
     */
    function encode(bytes memory data) internal pure returns (string memory) {
        /**
         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
         * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
         */
        if (data.length == 0) return "";

        // Loads the table into memory
        string memory table = _TABLE;

        // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter
        // and split into 4 numbers of 6 bits.
        // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up
        // - `data.length + 2`  -> Round up
        // - `/ 3`              -> Number of 3-bytes chunks
        // - `4 *`              -> 4 characters for each chunk
        string memory result = new string(4 * ((data.length + 2) / 3));

        assembly {
            // Prepare the lookup table (skip the first "length" byte)
            let tablePtr := add(table, 1)

            // Prepare result pointer, jump over length
            let resultPtr := add(result, 32)

            // Run over the input, 3 bytes at a time
            for {
                let dataPtr := data
                let endPtr := add(data, mload(data))
            } lt(dataPtr, endPtr) {

            } {
                // Advance 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)

                // To write each character, shift the 3 bytes (18 bits) chunk
                // 4 times in blocks of 6 bits for each character (18, 12, 6, 0)
                // and apply logical AND with 0x3F which is the number of
                // the previous character in the ASCII table prior to the Base64 Table
                // The result is then added to the table to get the character to write,
                // and finally write it in the result pointer but with a left shift
                // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits

                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance

                mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F))))
                resultPtr := add(resultPtr, 1) // Advance
            }

            // When data `bytes` is not exactly 3 bytes long
            // it is padded with `=` characters at the end
            switch mod(mload(data), 3)
            case 1 {
                mstore8(sub(resultPtr, 1), 0x3d)
                mstore8(sub(resultPtr, 2), 0x3d)
            }
            case 2 {
                mstore8(sub(resultPtr, 1), 0x3d)
            }
        }

        return result;
    }
}

// File: @openzeppelin/contracts/token/common/ERC2981.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/common/ERC2981.sol)

pragma solidity ^0.8.0;

import "../../interfaces/IERC2981.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.
 *
 * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
 * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
 *
 * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the
 * fee is specified in basis points by default.
 *
 * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
 * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
 * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
 *
 * _Available since v4.5._
 */
abstract contract ERC2981 is IERC2981, ERC165 {
    struct RoyaltyInfo {
        address receiver;
        uint96 royaltyFraction;
    }

    RoyaltyInfo private _defaultRoyaltyInfo;
    mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
        return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @inheritdoc IERC2981
     */
    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) {
        RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId];

        if (royalty.receiver == address(0)) {
            royalty = _defaultRoyaltyInfo;
        }

        uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator();

        return (royalty.receiver, royaltyAmount);
    }

    /**
     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
     * override.
     */
    function _feeDenominator() internal pure virtual returns (uint96) {
        return 10000;
    }

    /**
     * @dev Sets the royalty information that all ids in this contract will default to.
     *
     * Requirements:
     *
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: invalid receiver");

        _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Removes default royalty information.
     */
    function _deleteDefaultRoyalty() internal virtual {
        delete _defaultRoyaltyInfo;
    }

    /**
     * @dev Sets the royalty information for a specific token id, overriding the global default.
     *
     * Requirements:
     *
     * - `tokenId` must be already minted.
     * - `receiver` cannot be the zero address.
     * - `feeNumerator` cannot be greater than the fee denominator.
     */
    function _setTokenRoyalty(
        uint256 tokenId,
        address receiver,
        uint96 feeNumerator
    ) internal virtual {
        require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
        require(receiver != address(0), "ERC2981: Invalid parameters");

        _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);
    }

    /**
     * @dev Resets royalty information for the token id back to the global default.
     */
    function _resetTokenRoyalty(uint256 tokenId) internal virtual {
        delete _tokenRoyaltyInfo[tokenId];
    }
}

// File: contracts/ERC1155/IERC1155.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
    external
    view
    returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

// File: contracts/ERC1155/extensions/IERC1155MetadataURI.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/extensions/IERC1155MetadataURI.sol)

pragma solidity ^0.8.0;

import "../IERC1155.sol";

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURI is IERC1155 {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

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



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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



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

pragma solidity ^0.8.0;

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

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

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



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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



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

pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/interfaces/IERC2981.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
    /**
     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}