// File: /contracts/Rebirth.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

/*                                                                     Rebirth
Afterlife.garden                                                                                                                                  2022
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Luna Ikuta                                                                                                                                    Teknique
                                                               Welcome to The Afterlife                                                            */

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/interfaces/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

contract Rebirth is ERC721, ERC721Enumerable, ERC721URIStorage, Ownable, ReentrancyGuard {
  using Counters for Counters.Counter;
  Counters.Counter private _tokenCounter;

  address private constant REMEMBER_ME = 0xCCB9D89e0F77Df3618EEC9f6BF899Be3B5561A89;
  uint256 public constant FLOWER_PRICE_REGULAR = 0.25 ether;
  uint256 public constant FLOWER_PRICE_REMEMBER_ME_HOLDER = 0.025 ether;
  uint256 public constant BETTA_MOONLIGHT_PRICE = 0.035 ether;
  
  address public luna;
  address public teknique;

  bool public isFlowerMintActive;
  bool public isBettaMintActive;
  bool public isMoonlightMintActive;
  bool public areMintsAndURIsLocked;
  bool public revealOneHappened;
  bool public revealTwoHappened;
  bool public revealThreeHappened;
  bool public revealFourHappened;
  bool public isSpiritTalismanClaimed; // 1/1
  uint256 public numPlatinumTalismansClaimed; // 1/10
  uint256 public numGoldTalismansClaimed; // 1/15
  uint256 public numSilverTalismansClaimed; // 1/20
  uint256 public numBronzeTalismansClaimed; // 1/25
  mapping (uint256 => bool) private _goldsUsedToClaimTriumph;
  
  string private _baseURIExtended;
  string private _flowerOneTokenURI = "1"; 
  string private _flowerTwoTokenURI = "2";
  string private _flowerThreeTokenURI = "3";
  string private _flowerFourTokenURI = "4";
  string private _flowerFiveTokenURI = "5";
  string private _bronzeBouquetOneTokenURI = "6";
  string private _bronzeBouquetTwoTokenURI = "7";
  string private _bronzeBouquetThreeTokenURI = "8";
  string private _bronzeTalismanTokenURI = "9";
  string private _bettaTokenURI = "10";
  string private _flowerOneBettaTokenURI = "11";
  string private _flowerTwoBettaTokenURI = "12";
  string private _flowerThreeBettaTokenURI = "13";
  string private _flowerFourBettaTokenURI = "14";
  string private _flowerFiveBettaTokenURI = "15";
  string private _silverBouquetOneTokenURI = "16";
  string private _silverBouquetTwoTokenURI = "17";
  string private _silverBouquetThreeTokenURI = "18";
  string private _silverTalismanTokenURI = "19";
  string private _moonlightTokenURI = "20";
  string private _flowerOneEclipsedTokenURI = "21";
  string private _flowerTwoEclipsedTokenURI = "22";
  string private _flowerThreeEclipsedTokenURI = "23";
  string private _flowerFourEclipsedTokenURI = "24";
  string private _flowerFiveEclipsedTokenURI = "25";
  string private _goldBouquetTokenURI = "26";
  string private _goldTalismanTokenURI = "27";
  string private _triumphTokenURI = "28";
  string private _triumphBettaTokenURI = "29";
  string private _triumphEclipsedTokenURI = "30";
  string private _flowerOneBettaEclipsedTokenURI = "31";
  string private _flowerTwoBettaEclipsedTokenURI = "32";
  string private _flowerThreeBettaEclipsedTokenURI = "33";
  string private _flowerFourBettaEclipsedTokenURI = "34";
  string private _flowerFiveBettaEclipsedTokenURI = "35";
  string private _triumphBettaEclipsedTokenURI = "36";
  string private _platinumBouquetTokenURI = "37";
  string private _stoneTalismanTokenURI = "38";
  string private _platinumTalismanTokenURI = "39";
  string private _spiritTalismanTokenURI  = "40";

  constructor(address _luna, address _teknique) ERC721("Rebirth", "REBIRTH") {
    luna = _luna;
    teknique = _teknique;
  }
 
  // * * * * * * * * * * * * * * * * * * * * * * MINTING * * * * * * * * * * * * * * * * * * * * * *
  function mintFlower(uint256 numberOfTokens)
    external
    payable
    nonReentrant
  {
    require(isFlowerMintActive && numberOfTokens > 0, "MF1");
    IERC721 rememberMe = IERC721(REMEMBER_ME);
    uint256 rememberMeBalance = rememberMe.balanceOf(msg.sender);
    uint256 numCollectorsSeedsRedeemable = rememberMeBalance * 5;
    if (rememberMeBalance > 0 && balanceOf(msg.sender) < numCollectorsSeedsRedeemable) {
      require(FLOWER_PRICE_REMEMBER_ME_HOLDER * numberOfTokens <= msg.value && 
        balanceOf(msg.sender) + numberOfTokens <= numCollectorsSeedsRedeemable, "MF2");
    } else {
      require(FLOWER_PRICE_REGULAR * numberOfTokens <= msg.value, "MF3");
    }

    uint256 tokenId;
    uint256 nonce;
    uint256 randomNum;
    string memory _newTokenURI;
    for (uint256 i = 0; i < numberOfTokens; i++) {
      _newTokenURI = _flowerFiveTokenURI;
      nonce = (i + 7) % 13;
      randomNum = random(nonce);
      if(randomNum < 200) {
        _newTokenURI = _flowerOneTokenURI;
      } else if (randomNum < (400) ) {
        _newTokenURI = _flowerTwoTokenURI;
      } else if (randomNum < (600) ) {
        _newTokenURI = _flowerThreeTokenURI;
      } else if (randomNum < (800) ) {
        _newTokenURI = _flowerFourTokenURI;
      }
      tokenId = nextTokenId();
      _safeMint(msg.sender, tokenId);
      _setTokenURI(tokenId, _newTokenURI);
    }
  }
  
  function mintMoonlight(uint256 numberOfTokens)
    external
    payable
    nonReentrant
    isCorrectPayment(BETTA_MOONLIGHT_PRICE, numberOfTokens)
  {
    require(isMoonlightMintActive && numberOfTokens > 0, "MM");
    uint256 tokenId;
    for (uint256 i = 0; i < numberOfTokens; i++) {
     tokenId = nextTokenId();
      _safeMint(msg.sender, tokenId);
      _setTokenURI(tokenId, _moonlightTokenURI);
    }
  }

  function mintBetta(uint256 numberOfTokens)
    external
    payable
    nonReentrant
    isCorrectPayment(BETTA_MOONLIGHT_PRICE, numberOfTokens)
  {
    require(isBettaMintActive && numberOfTokens > 0, "MB");
    uint256 tokenId;
    for (uint256 i = 0; i < numberOfTokens; i++) {
      tokenId = nextTokenId();
      _safeMint(msg.sender, tokenId);
      _setTokenURI(tokenId, _bettaTokenURI);
    }
  }

  // * * * * * * * * * * * * * * * * * * * * JOURNEY CONTROL * * * * * * * * * * * * * * * * * * * *
  function setBaseURIExtended(string calldata baseURINew, uint256 revealNumber) external onlyAfterlife {
    require(!areMintsAndURIsLocked, "J1");
    _baseURIExtended = baseURINew;
    if(revealNumber == 1) {
      if(!revealOneHappened) {
        revealOneHappened = true;  
      }
    } else if (revealNumber == 2) {
      if(!revealTwoHappened) {
        revealTwoHappened = true;  
      }
    } else if (revealNumber == 3) {
     if(!revealThreeHappened) {
        revealThreeHappened = true;  
      }
    } else if (revealNumber == 4) {
      if(!revealFourHappened) {
        revealFourHappened = true;  
      }
    }
  }
  function setIsFlowerMintActive(bool _isFlowerMintActive) external onlyAfterlife {
    require(_isFlowerMintActive != isFlowerMintActive && (!_isFlowerMintActive || !areMintsAndURIsLocked), "J2");
    isFlowerMintActive = _isFlowerMintActive;
  }
  function setIsBettaMintActive(bool _isBettaMintActive) external onlyAfterlife {
    require(_isBettaMintActive != isBettaMintActive && (!_isBettaMintActive || !areMintsAndURIsLocked), "J3");
    isBettaMintActive = _isBettaMintActive;
  }
  function setIsMoonlightMintActive(bool _isMoonlightMintActive) external onlyAfterlife {
    require(_isMoonlightMintActive != isMoonlightMintActive && (!_isMoonlightMintActive || !areMintsAndURIsLocked), "J4");
    isMoonlightMintActive = _isMoonlightMintActive;
  }
  function lockMintsAndURIs() external onlyAfterlife {
    require(!areMintsAndURIsLocked, "J5");
    areMintsAndURIsLocked = true;
  }

  // * * * * * * * * * * * * * * * * * * * * * * Evolution * * * * * * * * * * * * * * * * * * * * * *
  // https://bafybeiasicqus44wyxb725g4cfyc552t6n7vl3ljg7ynq5tphezyhwjozm.ipfs.nftstorage.link/
  function evolve(uint256 tokenIdOne, uint256 tokenIdTwo) external nonReentrant {
    require(revealThreeHappened, "L1");
    string memory tokenOneURI = tokenURI(tokenIdOne);
    string memory tokenTwoURI = tokenURI(tokenIdTwo);
    require(compareURIs(tokenTwoURI, _moonlightTokenURI) || compareURIs(tokenTwoURI, _bettaTokenURI), "L2");
    string memory newURI;
    if(compareURIs(tokenTwoURI, _moonlightTokenURI)) {
      // * * * * * * * * * * * * * * * * * * *  SECRET GARDEN * * * * * * * * * * * * * * * * * * * *
      // https://bafybeidikmewa2awa2da47peuhwfzqai4zwlepoypusdbr3rzpz6iqeomm.ipfs.nftstorage.link/
      // Once a Gold Bouquet Is Claimed, The Ability to Combine Two Moonlights Will Unlock In The
      // "Lab" -> "Evolution" UI of https://Afterlife.garden. 
      // For Each Gold Bouquet Owned, One Triumph Can Be Claimed By Combining Two Moonlights. 
      // After the Triumph Is Claimed, The Ability To Combine Moonlights Dissapears...
      if(compareURIs(tokenOneURI, _moonlightTokenURI)) {
        uint256 balance = balanceOf(msg.sender);
        bool hasUnusedGold = false;
        uint256 i = 0;
        string memory uriAtIndex;
        uint256 tokenIdAtIndex;
        while (i < balance && !hasUnusedGold) {
          tokenIdAtIndex = tokenOfOwnerByIndex(msg.sender, i);
          uriAtIndex = tokenURI(tokenIdAtIndex);
          if(compareURIs(uriAtIndex, _goldBouquetTokenURI) && !_goldsUsedToClaimTriumph[tokenIdAtIndex]) {
            hasUnusedGold = true;
          }
          i++;
        }
        require(hasUnusedGold, "L3");
        _goldsUsedToClaimTriumph[tokenIdAtIndex] = true;
        newURI = _triumphTokenURI;
      } else {
        newURI = getNewURIWithMoonlight(tokenOneURI);
      }
    } else if(compareURIs(tokenTwoURI, _bettaTokenURI)) {
      newURI = getNewURIWithBetta(tokenOneURI);
    } 
    _setTokenURI(tokenIdOne, newURI);
    _burn(tokenIdTwo);
  }

  function hasUnusedGoldBouquet(address senderAddress) external view returns (bool) {
    bool hasUnusedGold = false;
    uint256 i = 0;
    string memory uriAtIndex;
    uint256 tokenIdAtIndex;
    uint256 balance = balanceOf(senderAddress);
    while (i < balance && !hasUnusedGold) {
      tokenIdAtIndex = tokenOfOwnerByIndex(senderAddress, i);
      uriAtIndex = tokenURI(tokenIdAtIndex);
      if(compareURIs(uriAtIndex, _goldBouquetTokenURI) && !_goldsUsedToClaimTriumph[tokenIdAtIndex]) {
        hasUnusedGold = true;
      }
      i++;
    }
    return hasUnusedGold;
  } 

  // * * * * * * * * * * * * * * * * * * * * * * FESTIVAL * * * * * * * * * * * * * * * * * * * * * *
  // https://bafybeia3bt5cttyakx4fbwx7dsihqvtnvk2zvexuw2g3gv7nluxwnobmbe.ipfs.nftstorage.link/
  function arrange(uint256 arrangement) external nonReentrant {
    require(revealTwoHappened, "B1");
    uint256 balance = balanceOf(msg.sender);
    require(balance > 4, "B2");
    require(arrangement < 4, "B3");
    
    uint256 randomNum = random(((block.timestamp % 10) + 7) % 13);
    string[5] memory flowerURIs = [_flowerOneTokenURI, _flowerTwoTokenURI, _flowerThreeTokenURI, _flowerFourTokenURI, _flowerFiveTokenURI];
    string memory bouquetURI = _bronzeBouquetOneTokenURI;
    if(randomNum < 200) {
      bouquetURI = _bronzeBouquetThreeTokenURI;
    } else if (randomNum < 500) {
      bouquetURI = _bronzeBouquetTwoTokenURI;
    }
    // Arrangements: 0 - Bronze, 1 - Silver, 2 - Gold, 3 - Platinum
    if(arrangement == 1) {
      flowerURIs[0] = _flowerOneBettaTokenURI;
      flowerURIs[1] = _flowerTwoBettaTokenURI;
      flowerURIs[2] = _flowerThreeBettaTokenURI;
      flowerURIs[3] = _flowerFourBettaTokenURI;
      flowerURIs[4] = _flowerFiveBettaTokenURI;
      if(randomNum < 290) {
        bouquetURI = _silverBouquetThreeTokenURI;
      } else if(randomNum < 620) {
        bouquetURI = _silverBouquetTwoTokenURI;
      } else {
        bouquetURI = _silverBouquetOneTokenURI;
      }
    }
    if(arrangement == 2) {
      flowerURIs[0] = _flowerOneEclipsedTokenURI;
      flowerURIs[1] = _flowerTwoEclipsedTokenURI;
      flowerURIs[2] = _flowerThreeEclipsedTokenURI;
      flowerURIs[3] = _flowerFourEclipsedTokenURI;
      flowerURIs[4] = _flowerFiveEclipsedTokenURI;
      bouquetURI = _goldBouquetTokenURI;
    } 
    if(arrangement == 3) {
      flowerURIs[0] = _flowerOneBettaEclipsedTokenURI;
      flowerURIs[1] = _flowerTwoBettaEclipsedTokenURI;
      flowerURIs[2] = _flowerThreeBettaEclipsedTokenURI;
      flowerURIs[3] = _flowerFourBettaEclipsedTokenURI;
      flowerURIs[4] = _flowerFiveBettaEclipsedTokenURI;
      bouquetURI = _platinumBouquetTokenURI;
    } 

    // Iterate over user's owned tokens & count number of tokens that
    // match the uris of flowers trying to be combined
    uint256[5] memory matchingFlowers;
    bool hasFlowerOne = false;
    bool hasFlowerTwo = false;
    bool hasFlowerThree = false;
    bool hasFlowerFour = false;
    bool hasFlowerFive = false;
    uint256 numMatchingFlowers = 0;
    string memory uriAtIndex;
    uint256 tokenIdAtIndex;
    uint256 i = 0;
    while (i < balance && !(hasFlowerOne && hasFlowerTwo && hasFlowerThree && hasFlowerFour && hasFlowerFive)) {
      tokenIdAtIndex = tokenOfOwnerByIndex(msg.sender, i);
      uriAtIndex = tokenURI(tokenIdAtIndex);
      if(!hasFlowerOne && compareURIs(uriAtIndex, flowerURIs[0])) {
        matchingFlowers[numMatchingFlowers] = tokenIdAtIndex;
        hasFlowerOne = true;
        numMatchingFlowers++;
      }
      if(!hasFlowerTwo && compareURIs(uriAtIndex, flowerURIs[1])) {
        matchingFlowers[numMatchingFlowers] = tokenIdAtIndex;
        hasFlowerTwo = true;
        numMatchingFlowers++;
      }
      if(!hasFlowerThree && compareURIs(uriAtIndex, flowerURIs[2])) {
        matchingFlowers[numMatchingFlowers] = tokenIdAtIndex;
        hasFlowerThree = true;
        numMatchingFlowers++;
      }
      if(!hasFlowerFour && compareURIs(uriAtIndex, flowerURIs[3])) {
        matchingFlowers[numMatchingFlowers] = tokenIdAtIndex;
        hasFlowerFour = true;
        numMatchingFlowers++;
      }
      if(!hasFlowerFive && compareURIs(uriAtIndex, flowerURIs[4])) {
        matchingFlowers[numMatchingFlowers] = tokenIdAtIndex;
        hasFlowerFive = true;
        numMatchingFlowers++;
      }
      i++;
    }
    require(numMatchingFlowers > 4, "B4");
    // Update the first matching flower to have new uri for the alpha. Burn the next two tokens.
    _setTokenURI(matchingFlowers[0], bouquetURI);
    bool talismanClaimed = false;
    if(arrangement == 3) {
      talismanClaimed = true;
      // First to Claim Platinum Bouquet Gets The Spirit Talisman
      if(!isSpiritTalismanClaimed) {
        isSpiritTalismanClaimed = true;
        _setTokenURI(matchingFlowers[1], _spiritTalismanTokenURI);
      } else if(numPlatinumTalismansClaimed < 10) {
        // Next Ten to Claim Platinum Bouquet Get The Platinum Talisman
        numPlatinumTalismansClaimed += 1;
        _setTokenURI(matchingFlowers[1], _platinumTalismanTokenURI);
      } else {
        _setTokenURI(matchingFlowers[1], _stoneTalismanTokenURI);
      }
    } else if(arrangement == 2) {
      if(numGoldTalismansClaimed < 15) {
        talismanClaimed = true;
        numGoldTalismansClaimed += 1;
        _setTokenURI(matchingFlowers[1], _goldTalismanTokenURI);
      }
    } else if(arrangement == 1) {
      if(numSilverTalismansClaimed < 20) {
        talismanClaimed = true;
        numSilverTalismansClaimed += 1;
        _setTokenURI(matchingFlowers[1], _silverTalismanTokenURI);
      }
    } else {
      if(numBronzeTalismansClaimed < 25) {
        talismanClaimed = true;
        numBronzeTalismansClaimed += 1;
        _setTokenURI(matchingFlowers[1], _bronzeTalismanTokenURI);
      }
    }
    if(!talismanClaimed) {
      _burn(matchingFlowers[1]);
    }
    _burn(matchingFlowers[2]);
    _burn(matchingFlowers[3]);
    _burn(matchingFlowers[4]);
  }

  // * * * * * * * * * * * * * * * * * * * * * * HELPERS * * * * * * * * * * * * * * * * * * * * * *
  function compareURIs(string memory a, string memory b) private view returns (bool) {
    return (keccak256(abi.encodePacked(a)) == keccak256(abi.encodePacked(_baseURIExtended, b)));
  }

  function nextTokenId() private returns (uint256) {
    _tokenCounter.increment();
    return _tokenCounter.current();
  }

  function random(uint256 nonce) private view returns (uint256) {
    uint256 seed = uint256(keccak256(abi.encodePacked(
        block.timestamp + block.difficulty +
        ((uint256(keccak256(abi.encodePacked(block.coinbase, nonce)))) / (block.timestamp + nonce)) +
        block.gaslimit + 
        ((uint256(keccak256(abi.encodePacked(nonce, msg.sender)))) / (block.timestamp - nonce)) +
        block.number
    )));
    return (seed - ((seed / 1000) * 1000));
  }

  function getNewURIWithMoonlight(string memory uri) private view returns (string memory) {
    if(compareURIs(uri, _flowerOneTokenURI)) {
      return _flowerOneEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerTwoTokenURI)) {
      return _flowerTwoEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerThreeTokenURI)) {
      return _flowerThreeEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerFourTokenURI)) {
      return _flowerFourEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerFiveTokenURI)) {
      return _flowerFiveEclipsedTokenURI;
    }
    if(compareURIs(uri, _triumphTokenURI)) {
      return _triumphEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerOneBettaTokenURI)) {
      return _flowerOneBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerTwoBettaTokenURI)) {
      return _flowerTwoBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerThreeBettaTokenURI)) {
      return _flowerThreeBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerFourBettaTokenURI)) {
      return _flowerFourBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerFiveBettaTokenURI)) {
      return _flowerFiveBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _triumphBettaTokenURI)) {
      return _triumphBettaEclipsedTokenURI;
    }
    return uri;
  }

  function getNewURIWithBetta(string memory uri) private view returns (string memory) {
    if(compareURIs(uri, _flowerOneTokenURI)) {
      return _flowerOneBettaTokenURI;
    }
    if(compareURIs(uri, _flowerTwoTokenURI)) {
      return _flowerTwoBettaTokenURI;
    }
    if(compareURIs(uri, _flowerThreeTokenURI)) {
      return _flowerThreeBettaTokenURI;
    }
    if(compareURIs(uri, _flowerFourTokenURI)) {
      return _flowerFourBettaTokenURI;
    }
    if(compareURIs(uri, _flowerFiveTokenURI)) {
      return _flowerFiveBettaTokenURI;
    }
    if(compareURIs(uri, _triumphTokenURI)) {
      return _triumphBettaTokenURI;
    }
    if(compareURIs(uri, _flowerOneEclipsedTokenURI)) {
      return _flowerOneBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerTwoEclipsedTokenURI)) {
      return _flowerTwoBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerThreeEclipsedTokenURI)) {
      return _flowerThreeBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerFourEclipsedTokenURI)) {
      return _flowerFourBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _flowerFiveEclipsedTokenURI)) {
      return _flowerFiveBettaEclipsedTokenURI;
    }
    if(compareURIs(uri, _triumphEclipsedTokenURI)) {
      return _triumphBettaEclipsedTokenURI;
    }
    return uri;
  }

  // * * * * * * * * * * * * * * * * * * * * * MODIFIERS * * * * * * * * * * * * * * * * * * * * *
  modifier onlyAfterlife() {
    require(_msgSender() == luna || _msgSender() == teknique, "M1");
    _;
  }
  modifier onlyTeknique() {
    require(_msgSender() == teknique, "M2");
    _;
  }
  modifier isCorrectPayment(uint256 price, uint256 numberOfTokens) {
    require(price * numberOfTokens <= msg.value, "M3");
    _;
  }

  // * * * * * * * * * * * * * * * * * * * * * WITHDRAWING * * * * * * * * * * * * * * * * * * * * *
  function withdraw() external onlyAfterlife {
    uint256 splitAmount = address(this).balance / 2;
    payable(luna).transfer(splitAmount);
    payable(teknique).transfer(splitAmount);
  }

  // * * * * * * * * * * * * * * * * * * * * * FAILSAFES * * * * * * * * * * * * * * * * * * * * * *
  function setLuna(address _luna) external onlyAfterlife {  
    luna = _luna;
  }

  function setTeknique(address _teknique) external onlyTeknique {  
    teknique = _teknique;
  }

  // * * * * * * * * * * * * * * * * * * * * * PLUMBING * * * * * * * * * * * * * * * * * * * * *
  function _baseURI() internal view override returns (string memory) {
    return _baseURIExtended;
  }

  // Required Boilerplate Solidity overrides
  function _beforeTokenTransfer(address from, address to, uint256 tokenId)
      internal
      override(ERC721, ERC721Enumerable)
  {
      super._beforeTokenTransfer(from, to, tokenId);
  }

  function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
      super._burn(tokenId);
  }

  function tokenURI(uint256 tokenId)
      public
      view
      override(ERC721, ERC721URIStorage)
      returns (string memory)
  {
      return super.tokenURI(tokenId);
  }

  function supportsInterface(bytes4 interfaceId)
      public
      view
      override(ERC721, ERC721Enumerable)
      returns (bool)
  {
      return super.supportsInterface(interfaceId);
  }
}
// File: @openzeppelin/contracts/utils/math/SafeMath.sol



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

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

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



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

pragma solidity ^0.8.0;

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

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



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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

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



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

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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



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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



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

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

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



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

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";

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

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

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721URIStorage: URI query for nonexistent token");

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

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

        return super.tokenURI(tokenId);
    }

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

    /**
     * @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 override {
        super._burn(tokenId);

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

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (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);
}

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



// 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);
}

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



// 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 {}
}

// 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/interfaces/IERC721.sol



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

pragma solidity ^0.8.0;

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

// 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);
    }
}