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

// This is only kept for backward compatability / upgrading
import {OwnableUpgradeable} from "../oz/access/OwnableUpgradeable.sol";
import {EnumerableMapUpgradeable, ERC721PausableUpgradeable, IERC721Upgradeable, ERC721Upgradeable} from "../oz/token/ERC721/ERC721PausableUpgradeable.sol";
import {IRegistrar} from "../interfaces/IRegistrar.sol";
import {StorageSlot} from "../oz/utils/StorageSlot.sol";
import {BeaconProxy} from "../oz/proxy/beacon/BeaconProxy.sol";
import {IZNSHub} from "../interfaces/IZNSHub.sol";

contract Registrar is
  IRegistrar,
  OwnableUpgradeable,
  ERC721PausableUpgradeable
{
  using EnumerableMapUpgradeable for EnumerableMapUpgradeable.UintToAddressMap;

  // Data recorded for each domain
  struct DomainRecord {
    address minter;
    bool metadataLocked;
    address metadataLockedBy;
    address controller;
    uint256 royaltyAmount;
    uint256 parentId;
    address subdomainContract;
  }

  // A map of addresses that are authorised to register domains.
  mapping(address => bool) public controllers;

  // A mapping of domain id's to domain data
  // This essentially expands the internal ERC721's token storage to additional fields
  mapping(uint256 => DomainRecord) public records;

  /**
   * @dev Storage slot with the admin of the contract.
   */
  bytes32 internal constant _ADMIN_SLOT =
    0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

  // The beacon address
  address public beacon;

  // If this is a subdomain contract these will be set
  uint256 public rootDomainId;
  address public parentRegistrar;

  // The event emitter
  IZNSHub public zNSHub;
  uint8 private test; // ignore
  uint256 private gap; // ignore

  function _getAdmin() internal view returns (address) {
    return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
  }

  modifier onlyController() {
    if (!controllers[msg.sender] && !zNSHub.isController(msg.sender)) {
      revert("ZR: Not controller");
    }
    _;
  }

  modifier onlyOwnerOf(uint256 id) {
    require(ownerOf(id) == msg.sender, "ZR: Not owner");
    _;
  }

  function initialize(
    address parentRegistrar_,
    uint256 rootDomainId_,
    string calldata collectionName,
    string calldata collectionSymbol,
    address zNSHub_
  ) public initializer {
    // __Ownable_init(); // Purposely not initializing ownable since we override owner()

    if (parentRegistrar_ == address(0)) {
      // create the root domain
      _createDomain(0, 0, msg.sender, address(0));
    } else {
      rootDomainId = rootDomainId_;
      parentRegistrar = parentRegistrar_;
    }

    zNSHub = IZNSHub(zNSHub_);

    __ERC721Pausable_init();
    __ERC721_init(collectionName, collectionSymbol);
  }

  function owner() public view override returns (address) {
    return zNSHub.owner();
  }

  /*
   * External Methods
   */

  /**
   * @notice Authorizes a controller to control the registrar
   * @param controller The address of the controller
   */
  function addController(address controller) external {
    require(
      msg.sender == owner() || msg.sender == parentRegistrar,
      "ZR: Not authorized"
    );
    require(!controllers[controller], "ZR: Controller is already added");
    controllers[controller] = true;
    emit ControllerAdded(controller);
  }

  /**
   * @notice Unauthorizes a controller to control the registrar
   * @param controller The address of the controller
   */
  function removeController(address controller) external override onlyOwner {
    require(
      msg.sender == owner() || msg.sender == parentRegistrar,
      "ZR: Not authorized"
    );
    require(controllers[controller], "ZR: Controller does not exist");
    controllers[controller] = false;
    emit ControllerRemoved(controller);
  }

  /**
   * @notice Pauses the registrar. Can only be done when not paused.
   */
  function pause() external onlyOwner {
    _pause();
  }

  /**
   * @notice Unpauses the registrar. Can only be done when not paused.
   */
  function unpause() external onlyOwner {
    _unpause();
  }

  /**
   * @notice Registers a new (sub) domain
   * @param parentId The parent domain
   * @param label The label of the domain
   * @param minter the minter of the new domain
   * @param metadataUri The uri of the metadata
   * @param royaltyAmount The amount of royalty this domain pays
   * @param locked Whether the domain is locked or not
   */
  function registerDomain(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked
  ) external override onlyController returns (uint256) {
    return
      _registerDomain(
        parentId,
        label,
        minter,
        metadataUri,
        royaltyAmount,
        locked
      );
  }

  function registerDomainAndSend(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked,
    address sendToUser
  ) external override onlyController returns (uint256) {
    // Register the domain
    uint256 id = _registerDomain(
      parentId,
      label,
      minter,
      metadataUri,
      royaltyAmount,
      locked
    );

    // immediately send domain to user
    _safeTransfer(minter, sendToUser, id, "");

    return id;
  }

  function registerSubdomainContract(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked,
    address sendToUser
  ) external onlyController returns (uint256) {
    // Register domain, `minter` is the minter
    uint256 id = _registerDomain(
      parentId,
      label,
      minter,
      metadataUri,
      royaltyAmount,
      locked
    );

    // Create subdomain contract as a beacon proxy
    address subdomainContract = address(
      new BeaconProxy(zNSHub.registrarBeacon(), "")
    );

    // More maintainable instead of using `data` in constructor
    Registrar(subdomainContract).initialize(
      address(this),
      id,
      "Zer0 Name Service",
      "ZNS",
      address(zNSHub)
    );

    // Indicate that the subdomain has a contract
    records[id].subdomainContract = subdomainContract;

    zNSHub.addRegistrar(id, subdomainContract);

    // immediately send the domain to the user (from the minter)
    _safeTransfer(minter, sendToUser, id, "");

    return id;
  }

  function _registerDomain(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked
  ) internal returns (uint256) {
    require(bytes(label).length > 0, "ZR: Empty name");
    // subdomain cannot be minted on domains which are subdomain contracts
    require(
      records[parentId].subdomainContract == address(0),
      "ZR: Parent is subcontract"
    );
    if (parentId != rootDomainId) {
      // Domain parents must exist
      require(_exists(parentId), "ZR: No parent");
    }

    // Create the child domain under the parent domain
    uint256 labelHash = uint256(keccak256(bytes(label)));
    address controller = msg.sender;

    // Calculate the new domain's id and create it
    uint256 domainId = uint256(
      keccak256(abi.encodePacked(parentId, labelHash))
    );
    _createDomain(parentId, domainId, minter, controller);
    _setTokenURI(domainId, metadataUri);

    if (locked) {
      records[domainId].metadataLockedBy = minter;
      records[domainId].metadataLocked = true;
    }

    if (royaltyAmount > 0) {
      records[domainId].royaltyAmount = royaltyAmount;
    }

    zNSHub.domainCreated(
      domainId,
      label,
      labelHash,
      parentId,
      minter,
      controller,
      metadataUri,
      royaltyAmount
    );

    return domainId;
  }

  /**
   * @notice Sets the domain royalty amount
   * @param id The domain to set on
   * @param amount The royalty amount
   */
  function setDomainRoyaltyAmount(uint256 id, uint256 amount)
    external
    override
    onlyOwnerOf(id)
  {
    require(!isDomainMetadataLocked(id), "ZR: Metadata locked");

    records[id].royaltyAmount = amount;
    zNSHub.royaltiesAmountChanged(id, amount);
  }

  /**
   * @notice Both sets and locks domain metadata uri in a single call
   * @param id The domain to lock
   * @param uri The uri to set
   */
  function setAndLockDomainMetadata(uint256 id, string memory uri)
    external
    override
    onlyOwnerOf(id)
  {
    require(!isDomainMetadataLocked(id), "ZR: Metadata locked");
    _setDomainMetadataUri(id, uri);
    _setDomainLock(id, msg.sender, true);
  }

  /**
   * @notice Sets the domain metadata uri
   * @param id The domain to set on
   * @param uri The uri to set
   */
  function setDomainMetadataUri(uint256 id, string memory uri)
    external
    override
    onlyOwnerOf(id)
  {
    require(!isDomainMetadataLocked(id), "ZR: Metadata locked");
    _setDomainMetadataUri(id, uri);
  }

  /**
   * @notice Locks a domains metadata uri
   * @param id The domain to lock
   * @param toLock whether the domain should be locked or not
   */
  function lockDomainMetadata(uint256 id, bool toLock) external override {
    _validateLockDomainMetadata(id, toLock);
    _setDomainLock(id, msg.sender, toLock);
  }

  /**
   * @notice transferFrom but many at a time
   * @param from Current owner of token
   * @param to New desired owner of token
   * @param tokenIds The tokens to ransfer
   */
  function transferFromBulk(
    address from,
    address to,
    uint256[] calldata tokenIds
  ) public {
    for (uint256 i = 0; i < tokenIds.length; ++i) {
      uint256 tokenId = tokenIds[i];
      require(
        _isApprovedOrOwner(_msgSender(), tokenId),
        "ERC721: transfer caller is not owner nor approved"
      );

      _transfer(from, to, tokenId);
    }
  }

  /*
   * Public View
   */

  function ownerOf(uint256 tokenId)
    public
    view
    virtual
    override(ERC721Upgradeable, IERC721Upgradeable)
    returns (address)
  {
    // Check if the token is in this contract
    if (_tokenOwners.contains(tokenId)) {
      return
        _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    return zNSHub.ownerOf(tokenId);
  }

  /**
   * @notice Returns whether or not an account is a a controller registered on this contract
   * @param account Address of account to check
   */
  function isController(address account) external view override returns (bool) {
    bool accountIsController = controllers[account];
    return accountIsController;
  }

  /**
   * @notice Returns whether or not a domain is exists
   * @param id The domain
   */
  function domainExists(uint256 id) public view override returns (bool) {
    bool domainNftExists = _exists(id);
    return domainNftExists;
  }

  /**
   * @notice Returns the original minter of a domain
   * @param id The domain
   */
  function minterOf(uint256 id) public view override returns (address) {
    address minter = records[id].minter;
    return minter;
  }

  /**
   * @notice Returns whether or not a domain's metadata is locked
   * @param id The domain
   */
  function isDomainMetadataLocked(uint256 id)
    public
    view
    override
    returns (bool)
  {
    bool isLocked = records[id].metadataLocked;
    return isLocked;
  }

  /**
   * @notice Returns who locked a domain's metadata
   * @param id The domain
   */
  function domainMetadataLockedBy(uint256 id)
    public
    view
    override
    returns (address)
  {
    address lockedBy = records[id].metadataLockedBy;
    return lockedBy;
  }

  /**
   * @notice Returns the controller which created the domain on behalf of a user
   * @param id The domain
   */
  function domainController(uint256 id) public view override returns (address) {
    address controller = records[id].controller;
    return controller;
  }

  /**
   * @notice Returns the current royalty amount for a domain
   * @param id The domain
   */
  function domainRoyaltyAmount(uint256 id)
    public
    view
    override
    returns (uint256)
  {
    uint256 amount = records[id].royaltyAmount;
    return amount;
  }

  /**
   * @notice Returns the parent id of a domain.
   * @param id The domain
   */
  function parentOf(uint256 id) public view override returns (uint256) {
    require(_exists(id), "ZR: Does not exist");

    uint256 parentId = records[id].parentId;
    return parentId;
  }

  /*
   * Internal Methods
   */

  function _transfer(
    address from,
    address to,
    uint256 tokenId
  ) internal virtual override {
    super._transfer(from, to, tokenId);
    // Need to emit transfer events on event emitter
    zNSHub.domainTransferred(from, to, tokenId);
  }

  function _setDomainMetadataUri(uint256 id, string memory uri) internal {
    _setTokenURI(id, uri);
    zNSHub.metadataChanged(id, uri);
  }

  function _validateLockDomainMetadata(uint256 id, bool toLock) internal view {
    if (toLock) {
      require(ownerOf(id) == msg.sender, "ZR: Not owner");
      require(!isDomainMetadataLocked(id), "ZR: Metadata locked");
    } else {
      require(isDomainMetadataLocked(id), "ZR: Not locked");
      require(domainMetadataLockedBy(id) == msg.sender, "ZR: Not locker");
    }
  }

  // internal - creates a domain
  function _createDomain(
    uint256 parentId,
    uint256 domainId,
    address minter,
    address controller
  ) internal {
    // Create the NFT and register the domain data
    _mint(minter, domainId);
    records[domainId] = DomainRecord({
      parentId: parentId,
      minter: minter,
      metadataLocked: false,
      metadataLockedBy: address(0),
      controller: controller,
      royaltyAmount: 0,
      subdomainContract: address(0)
    });
  }

  function _setDomainLock(
    uint256 id,
    address locker,
    bool lockStatus
  ) internal {
    records[id].metadataLockedBy = locker;
    records[id].metadataLocked = lockStatus;

    zNSHub.metadataLockChanged(id, locker, lockStatus);
  }

  function adminBurnToken(uint256 tokenId) external onlyOwner {
    _burn(tokenId);
    delete (records[tokenId]);
  }

  function adminSetMetadataBulk(
    string memory folderWithIPFSPrefix,
    uint256[] memory orderedIds,
    uint256 ipfsFolderIndexOffset
  ) external onlyOwner {
    for (uint256 i = 0; i < orderedIds.length; i++) {
      _setDomainMetadataUri(
        orderedIds[i],
        string(
          abi.encodePacked(
            folderWithIPFSPrefix,
            uint2str(ipfsFolderIndexOffset + i)
          )
        )
      );
    }
  }

  /**
   * Sets metadata via IPFS folder in a bulk fashion via token index (not token ID)
   * @param folderWithIPFSPrefix the IPFS Folder (ie: "ipfs://QmABCDEFG/")
   * @param tokenIndexStart The token index starting point
   * @param ipfsFolderIndexStart The IPFS folder index starting point
   * @param count The number of tokens to modify [start index -> start index + count]
   */
  function adminSetMetadataBulkByIndex(
    string memory folderWithIPFSPrefix,
    uint256 tokenIndexStart,
    uint256 ipfsFolderIndexStart,
    uint256 count
  ) external onlyOwner {
    for (uint256 i = 0; i < count; i++) {
      _setDomainMetadataUri(
        tokenByIndex(tokenIndexStart + i),
        string(
          abi.encodePacked(
            folderWithIPFSPrefix,
            uint2str(ipfsFolderIndexStart + i)
          )
        )
      );
    }
  }

  function adminTransfer(
    address from,
    address to,
    uint256 tokenId
  ) external onlyOwner {
    _transfer(from, to, tokenId);
  }

  function adminSetMetadataUri(uint256 id, string memory uri)
    external
    onlyOwner
  {
    _setDomainMetadataUri(id, uri);
  }

  function setZNSHub(IZNSHub hub) external onlyOwner {
    zNSHub = hub;
  }

  function registerDomainAndSendBulk(
    uint256 parentId,
    uint256 namingOffset, // e.g., the IPFS node refers to the metadata as x. the zNS label will be x + namingOffset
    uint256 startingIndex,
    uint256 endingIndex,
    address minter,
    string memory folderWithIPFSPrefix, // e.g., ipfs://Qm.../
    uint256 royaltyAmount,
    bool locked
  ) external onlyController {
    require(endingIndex - startingIndex > 0, "Invalid number of domains");
    uint256 result;
    for (uint256 i = startingIndex; i < endingIndex; i++) {
      result = _registerDomain(
        parentId,
        uint2str(i + namingOffset),
        minter,
        string(abi.encodePacked(folderWithIPFSPrefix, uint2str(i))),
        royaltyAmount,
        locked
      );
    }
  }

  function uint2str(uint256 _i)
    internal
    pure
    returns (string memory _uintAsString)
  {
    if (_i == 0) {
      return "0";
    }
    uint256 j = _i;
    uint256 len;
    while (j != 0) {
      len++;
      j /= 10;
    }
    bytes memory bstr = new bytes(len);
    uint256 k = len;
    while (_i != 0) {
      k = k - 1;
      uint8 temp = (48 + uint8(_i - (_i / 10) * 10));
      bytes1 b1 = bytes1(temp);
      bstr[k] = b1;
      _i /= 10;
    }
    return string(bstr);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
  address private _owner;

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

  /**
   * @dev Initializes the contract setting the deployer as the initial owner.
   */
  function __Ownable_init() internal initializer {
    __Context_init_unchained();
    __Ownable_init_unchained();
  }

  function __Ownable_init_unchained() internal initializer {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), 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 {
    emit OwnershipTransferred(_owner, address(0));
    _owner = 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");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }

  uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "./ERC721Upgradeable.sol";
import "../../utils/PausableUpgradeable.sol";
import "../../proxy/Initializable.sol";

/**
 * @dev ERC721 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC721PausableUpgradeable is
  Initializable,
  ERC721Upgradeable,
  PausableUpgradeable
{
  function __ERC721Pausable_init() internal initializer {
    __Context_init_unchained();
    __ERC165_init_unchained();
    __Pausable_init_unchained();
    __ERC721Pausable_init_unchained();
  }

  function __ERC721Pausable_init_unchained() internal initializer {}

  /**
   * @dev See {ERC721-_beforeTokenTransfer}.
   *
   * Requirements:
   *
   * - the contract must not be paused.
   */
  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 tokenId
  ) internal virtual override {
    super._beforeTokenTransfer(from, to, tokenId);

    require(!paused(), "ERC721Pausable: token transfer while paused");
  }

  uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "../oz/token/ERC721/IERC721EnumerableUpgradeable.sol";
import "../oz/token/ERC721/IERC721MetadataUpgradeable.sol";

interface IRegistrar is
  IERC721MetadataUpgradeable,
  IERC721EnumerableUpgradeable
{
  // Emitted when a controller is removed
  event ControllerAdded(address indexed controller);

  // Emitted whenever a controller is removed
  event ControllerRemoved(address indexed controller);

  // Emitted whenever a new domain is created
  event DomainCreated(
    uint256 indexed id,
    string label,
    uint256 indexed labelHash,
    uint256 indexed parent,
    address minter,
    address controller,
    string metadataUri,
    uint256 royaltyAmount
  );

  // Emitted whenever the metadata of a domain is locked
  event MetadataLockChanged(uint256 indexed id, address locker, bool isLocked);

  // Emitted whenever the metadata of a domain is changed
  event MetadataChanged(uint256 indexed id, string uri);

  // Emitted whenever the royalty amount is changed
  event RoyaltiesAmountChanged(uint256 indexed id, uint256 amount);

  // Authorises a controller, who can register domains.
  function addController(address controller) external;

  // Revoke controller permission for an address.
  function removeController(address controller) external;

  // Registers a new sub domain
  function registerDomain(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked
  ) external returns (uint256);

  function registerDomainAndSend(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked,
    address sendToUser
  ) external returns (uint256);

  function registerSubdomainContract(
    uint256 parentId,
    string memory label,
    address minter,
    string memory metadataUri,
    uint256 royaltyAmount,
    bool locked,
    address sendToUser
  ) external returns (uint256);

  // Set a domains metadata uri and lock that domain from being modified
  function setAndLockDomainMetadata(uint256 id, string memory uri) external;

  // Lock a domain's metadata so that it cannot be changed
  function lockDomainMetadata(uint256 id, bool toLock) external;

  // Update a domain's metadata uri
  function setDomainMetadataUri(uint256 id, string memory uri) external;

  // Sets the asked royalty amount on a domain (amount is a percentage with 5 decimal places)
  function setDomainRoyaltyAmount(uint256 id, uint256 amount) external;

  // Returns whether an address is a controller
  function isController(address account) external view returns (bool);

  // Checks whether or not a domain exists
  function domainExists(uint256 id) external view returns (bool);

  // Returns the original minter of a domain
  function minterOf(uint256 id) external view returns (address);

  // Checks if a domains metadata is locked
  function isDomainMetadataLocked(uint256 id) external view returns (bool);

  // Returns the address which locked the domain metadata
  function domainMetadataLockedBy(uint256 id) external view returns (address);

  // Gets the controller that registered a domain
  function domainController(uint256 id) external view returns (address);

  // Gets a domains current royalty amount
  function domainRoyaltyAmount(uint256 id) external view returns (uint256);

  // Returns the parent domain of a child domain
  function parentOf(uint256 id) external view returns (uint256);
}

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

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlot {
  struct AddressSlot {
    address value;
  }

  struct BooleanSlot {
    bool value;
  }

  struct Bytes32Slot {
    bytes32 value;
  }

  struct Uint256Slot {
    uint256 value;
  }

  /**
   * @dev Returns an `AddressSlot` with member `value` located at `slot`.
   */
  function getAddressSlot(bytes32 slot)
    internal
    pure
    returns (AddressSlot storage r)
  {
    assembly {
      r.slot := slot
    }
  }

  /**
   * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
   */
  function getBooleanSlot(bytes32 slot)
    internal
    pure
    returns (BooleanSlot storage r)
  {
    assembly {
      r.slot := slot
    }
  }

  /**
   * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
   */
  function getBytes32Slot(bytes32 slot)
    internal
    pure
    returns (Bytes32Slot storage r)
  {
    assembly {
      r.slot := slot
    }
  }

  /**
   * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
   */
  function getUint256Slot(bytes32 slot)
    internal
    pure
    returns (Uint256Slot storage r)
  {
    assembly {
      r.slot := slot
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/BeaconProxy.sol)

pragma solidity ^0.8.0;

import "./IBeacon.sol";
import "../Proxy.sol";
import "../ERC1967/ERC1967Upgrade.sol";

/**
 * @dev This contract implements a proxy that gets the implementation address for each call from a {UpgradeableBeacon}.
 *
 * The beacon address is stored in storage slot `uint256(keccak256('eip1967.proxy.beacon')) - 1`, so that it doesn't
 * conflict with the storage layout of the implementation behind the proxy.
 *
 * _Available since v3.4._
 */
contract BeaconProxy is Proxy, ERC1967Upgrade {
  /**
   * @dev Initializes the proxy with `beacon`.
   *
   * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon. This
   * will typically be an encoded function call, and allows initializating the storage of the proxy like a Solidity
   * constructor.
   *
   * Requirements:
   *
   * - `beacon` must be a contract with the interface {IBeacon}.
   */
  constructor(address beacon, bytes memory data) payable {
    assert(
      _BEACON_SLOT == bytes32(uint256(keccak256("eip1967.proxy.beacon")) - 1)
    );
    _upgradeBeaconToAndCall(beacon, data, false);
  }

  /**
   * @dev Returns the current beacon address.
   */
  function _beacon() internal view virtual returns (address) {
    return _getBeacon();
  }

  /**
   * @dev Returns the current implementation address of the associated beacon.
   */
  function _implementation() internal view virtual override returns (address) {
    return IBeacon(_getBeacon()).implementation();
  }

  /**
   * @dev Changes the proxy to use a new beacon. Deprecated: see {_upgradeBeaconToAndCall}.
   *
   * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon.
   *
   * Requirements:
   *
   * - `beacon` must be a contract.
   * - The implementation returned by `beacon` must be a contract.
   */
  function _setBeacon(address beacon, bytes memory data) internal virtual {
    _upgradeBeaconToAndCall(beacon, data, false);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import {IRegistrar} from "./IRegistrar.sol";

interface IZNSHub {
  function addRegistrar(uint256 rootDomainId, address registrar) external;

  function isController(address controller) external returns (bool);

  function getRegistrarForDomain(uint256 domainId)
    external
    view
    returns (IRegistrar);

  function ownerOf(uint256 domainId) external view returns (address);

  function domainExists(uint256 domainId) external view returns (bool);

  function owner() external view returns (address);

  function registrarBeacon() external view returns (address);

  function domainTransferred(
    address from,
    address to,
    uint256 tokenId
  ) external;

  function domainCreated(
    uint256 id,
    string calldata name,
    uint256 nameHash,
    uint256 parent,
    address minter,
    address controller,
    string calldata metadataUri,
    uint256 royaltyAmount
  ) external;

  function metadataLockChanged(
    uint256 id,
    address locker,
    bool isLocked
  ) external;

  function metadataChanged(uint256 id, string calldata uri) external;

  function royaltiesAmountChanged(uint256 id, uint256 amount) external;

  // Returns the parent domain of a child domain
  function parentOf(uint256 id) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;
import "../proxy/Initializable.sol";

/*
 * @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 GSN 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 ContextUpgradeable is Initializable {
  function __Context_init() internal initializer {
    __Context_init_unchained();
  }

  function __Context_init_unchained() internal initializer {}

  function _msgSender() internal view virtual returns (address) {
    return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }

  uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity ^0.8.9;

import "../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {
  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private _initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private _initializing;

  /**
   * @dev Modifier to protect an initializer function from being invoked twice.
   */
  modifier initializer() {
    require(
      _initializing || _isConstructor() || !_initialized,
      "Initializable: contract is already initialized"
    );

    bool isTopLevelCall = !_initializing;
    if (isTopLevelCall) {
      _initializing = true;
      _initialized = true;
    }

    _;

    if (isTopLevelCall) {
      _initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function _isConstructor() private view returns (bool) {
    return !AddressUpgradeable.isContract(address(this));
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
  /**
   * @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
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // This method relies on extcodesize, which returns 0 for contracts in
    // construction, since the code is only stored at the end of the
    // constructor execution.

    uint256 size;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      size := extcodesize(account)
    }
    return size > 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");

    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (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");

    // solhint-disable-next-line avoid-low-level-calls
    (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");

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = target.staticcall(data);
    return _verifyCallResult(success, returndata, errorMessage);
  }

  function _verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) private 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

        // solhint-disable-next-line no-inline-assembly
        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "../../utils/ContextUpgradeable.sol";
import "./IERC721Upgradeable.sol";
import "./IERC721MetadataUpgradeable.sol";
import "./IERC721EnumerableUpgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "../../introspection/ERC165Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/EnumerableSetUpgradeable.sol";
import "../../utils/EnumerableMapUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../proxy/Initializable.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Upgradeable is
  Initializable,
  ContextUpgradeable,
  ERC165Upgradeable,
  IERC721Upgradeable,
  IERC721MetadataUpgradeable,
  IERC721EnumerableUpgradeable
{
  using SafeMathUpgradeable for uint256;
  using AddressUpgradeable for address;
  using EnumerableSetUpgradeable for EnumerableSetUpgradeable.UintSet;
  using EnumerableMapUpgradeable for EnumerableMapUpgradeable.UintToAddressMap;
  using StringsUpgradeable for uint256;

  // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
  // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
  bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

  // Mapping from holder address to their (enumerable) set of owned tokens
  mapping(address => EnumerableSetUpgradeable.UintSet) private _holderTokens;

  // Enumerable mapping from token ids to their owners
  EnumerableMapUpgradeable.UintToAddressMap internal _tokenOwners;

  // 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;

  // Token name
  string private _name;

  // Token symbol
  string private _symbol;

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

  // Base URI
  string private _baseURI;

  /*
   *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
   *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
   *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
   *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
   *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
   *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
   *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
   *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
   *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
   *
   *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
   *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
   */
  bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

  /*
   *     bytes4(keccak256('name()')) == 0x06fdde03
   *     bytes4(keccak256('symbol()')) == 0x95d89b41
   *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
   *
   *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
   */
  bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

  /*
   *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
   *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
   *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
   *
   *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
   */
  bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

  /**
   * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
   */
  function __ERC721_init(string memory name_, string memory symbol_)
    internal
    initializer
  {
    __Context_init_unchained();
    __ERC165_init_unchained();
    __ERC721_init_unchained(name_, symbol_);
  }

  function __ERC721_init_unchained(string memory name_, string memory symbol_)
    internal
    initializer
  {
    _name = name_;
    _symbol = symbol_;

    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(_INTERFACE_ID_ERC721);
    _registerInterface(_INTERFACE_ID_ERC721_METADATA);
    _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
  }

  /**
   * @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 _holderTokens[owner].length();
  }

  /**
   * @dev See {IERC721-ownerOf}.
   */
  function ownerOf(uint256 tokenId)
    public
    view
    virtual
    override
    returns (address)
  {
    return
      _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
  }

  /**
   * @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 _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));
    }
    // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
    return string(abi.encodePacked(base, tokenId.toString()));
  }

  /**
   * @dev Returns the base URI set via {_setBaseURI}. This will be
   * automatically added as a prefix in {tokenURI} to each token's URI, or
   * to the token ID if no specific URI is set for that token ID.
   */
  function baseURI() public view virtual returns (string memory) {
    return _baseURI;
  }

  /**
   * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
   */
  function tokenOfOwnerByIndex(address owner, uint256 index)
    public
    view
    virtual
    override
    returns (uint256)
  {
    return _holderTokens[owner].at(index);
  }

  /**
   * @dev See {IERC721Enumerable-totalSupply}.
   */
  function totalSupply() public view virtual override returns (uint256) {
    // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
    return _tokenOwners.length();
  }

  /**
   * @dev See {IERC721Enumerable-tokenByIndex}.
   */
  function tokenByIndex(uint256 index)
    public
    view
    virtual
    override
    returns (uint256)
  {
    (uint256 tokenId, ) = _tokenOwners.at(index);
    return tokenId;
  }

  /**
   * @dev See {IERC721-approve}.
   */
  function approve(address to, uint256 tokenId) public virtual override {
    address owner = ERC721Upgradeable.ownerOf(tokenId);
    require(to != owner, "ERC721: approval to current owner");

    require(
      _msgSender() == owner ||
        ERC721Upgradeable.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
  {
    require(operator != _msgSender(), "ERC721: approve to caller");

    _operatorApprovals[_msgSender()][operator] = approved;
    emit ApprovalForAll(_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 _tokenOwners.contains(tokenId);
  }

  /**
   * @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 = ERC721Upgradeable.ownerOf(tokenId);
    return (spender == owner ||
      getApproved(tokenId) == spender ||
      ERC721Upgradeable.isApprovedForAll(owner, spender));
  }

  /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `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);

    _holderTokens[to].add(tokenId);

    _tokenOwners.set(tokenId, to);

    emit Transfer(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 = ERC721Upgradeable.ownerOf(tokenId); // internal owner

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

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

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

    _holderTokens[owner].remove(tokenId);

    _tokenOwners.remove(tokenId);

    emit Transfer(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(
      ERC721Upgradeable.ownerOf(tokenId) == from,
      "ERC721: transfer of token that is not own"
    ); // internal 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);

    _holderTokens[from].remove(tokenId);
    _holderTokens[to].add(tokenId);

    _tokenOwners.set(tokenId, to);

    emit Transfer(from, to, tokenId);
  }

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

  /**
   * @dev Internal function to set the base URI for all token IDs. It is
   * automatically added as a prefix to the value returned in {tokenURI},
   * or to the token ID if {tokenURI} is empty.
   */
  function _setBaseURI(string memory baseURI_) internal virtual {
    _baseURI = baseURI_;
  }

  /**
   * @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()) {
      return true;
    }
    bytes memory returndata = to.functionCall(
      abi.encodeWithSelector(
        IERC721ReceiverUpgradeable(to).onERC721Received.selector,
        _msgSender(),
        from,
        tokenId,
        _data
      ),
      "ERC721: transfer to non ERC721Receiver implementer"
    );
    bytes4 retval = abi.decode(returndata, (bytes4));
    return (retval == _ERC721_RECEIVED);
  }

  /**
   * @dev Approve `to` to operate on `tokenId`
   *
   * Emits an {Approval} event.
   */
  function _approve(address to, uint256 tokenId) internal virtual {
    _tokenApprovals[tokenId] = to;
    emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId); // internal owner
  }

  /**
   * @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 {}

  uint256[41] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "./ContextUpgradeable.sol";
import "../proxy/Initializable.sol";

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

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

  bool private _paused;

  /**
   * @dev Initializes the contract in unpaused state.
   */
  function __Pausable_init() internal initializer {
    __Context_init_unchained();
    __Pausable_init_unchained();
  }

  function __Pausable_init_unchained() internal initializer {
    _paused = false;
  }

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

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

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

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

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

  uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;
import "../../introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
  /**
   * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
   */
  event Transfer(
    address indexed from,
    address indexed to,
    uint256 indexed tokenId
  );

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;
import "./IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
  /**
   * @dev Returns the token collection name.
   */
  function name() external view returns (string memory);

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;
import "./IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
  /**
   * @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 tokenId);

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
  /**
   * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
   * by `operator` from `from`, this function is called.
   *
   * It must return its Solidity selector to confirm the token transfer.
   * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
   *
   * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
   */
  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
  ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "./IERC165Upgradeable.sol";
import "../proxy/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
  /*
   * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
   */
  bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

  /**
   * @dev Mapping of interface ids to whether or not it's supported.
   */
  mapping(bytes4 => bool) private _supportedInterfaces;

  function __ERC165_init() internal initializer {
    __ERC165_init_unchained();
  }

  function __ERC165_init_unchained() internal initializer {
    // Derived contracts need only register support for their own interfaces,
    // we register support for ERC165 itself here
    _registerInterface(_INTERFACE_ID_ERC165);
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   *
   * Time complexity O(1), guaranteed to always use less than 30 000 gas.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override
    returns (bool)
  {
    return _supportedInterfaces[interfaceId];
  }

  /**
   * @dev Registers the contract as an implementer of the interface defined by
   * `interfaceId`. Support of the actual ERC165 interface is automatic and
   * registering its interface id is not required.
   *
   * See {IERC165-supportsInterface}.
   *
   * Requirements:
   *
   * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
   */
  function _registerInterface(bytes4 interfaceId) internal virtual {
    require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
    _supportedInterfaces[interfaceId] = true;
  }

  uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUpgradeable {
  /**
   * @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) {
    uint256 c = a + b;
    if (c < a) return (false, 0);
    return (true, c);
  }

  /**
   * @dev Returns the substraction of two unsigned integers, with an overflow flag.
   *
   * _Available since v3.4._
   */
  function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
    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) {
    // 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) {
    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) {
    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) {
    uint256 c = a + b;
    require(c >= a, "SafeMath: addition overflow");
    return c;
  }

  /**
   * @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) {
    require(b <= a, "SafeMath: subtraction overflow");
    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) {
    if (a == 0) return 0;
    uint256 c = a * b;
    require(c / a == b, "SafeMath: multiplication overflow");
    return c;
  }

  /**
   * @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. 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) internal pure returns (uint256) {
    require(b > 0, "SafeMath: division by zero");
    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) {
    require(b > 0, "SafeMath: modulo by zero");
    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) {
    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.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryDiv}.
   *
   * 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) {
    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) {
    require(b > 0, errorMessage);
    return a % b;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSetUpgradeable {
  // To implement this library for multiple types with as little code
  // repetition as possible, we write it in terms of a generic Set type with
  // bytes32 values.
  // The Set implementation uses private functions, and user-facing
  // implementations (such as AddressSet) are just wrappers around the
  // underlying Set.
  // This means that we can only create new EnumerableSets for types that fit
  // in bytes32.

  struct Set {
    // Storage of set values
    bytes32[] _values;
    // Position of the value in the `values` array, plus 1 because index 0
    // means a value is not in the set.
    mapping(bytes32 => uint256) _indexes;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function _add(Set storage set, bytes32 value) private returns (bool) {
    if (!_contains(set, value)) {
      set._values.push(value);
      // The value is stored at length-1, but we add 1 to all indexes
      // and use 0 as a sentinel value
      set._indexes[value] = set._values.length;
      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function _remove(Set storage set, bytes32 value) private returns (bool) {
    // We read and store the value's index to prevent multiple reads from the same storage slot
    uint256 valueIndex = set._indexes[value];

    if (valueIndex != 0) {
      // Equivalent to contains(set, value)
      // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
      // the array, and then remove the last element (sometimes called as 'swap and pop').
      // This modifies the order of the array, as noted in {at}.

      uint256 toDeleteIndex = valueIndex - 1;
      uint256 lastIndex = set._values.length - 1;

      // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
      // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

      bytes32 lastvalue = set._values[lastIndex];

      // Move the last value to the index where the value to delete is
      set._values[toDeleteIndex] = lastvalue;
      // Update the index for the moved value
      set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

      // Delete the slot where the moved value was stored
      set._values.pop();

      // Delete the index for the deleted slot
      delete set._indexes[value];

      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function _contains(Set storage set, bytes32 value)
    private
    view
    returns (bool)
  {
    return set._indexes[value] != 0;
  }

  /**
   * @dev Returns the number of values on the set. O(1).
   */
  function _length(Set storage set) private view returns (uint256) {
    return set._values.length;
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function _at(Set storage set, uint256 index) private view returns (bytes32) {
    require(set._values.length > index, "EnumerableSet: index out of bounds");
    return set._values[index];
  }

  // Bytes32Set

  struct Bytes32Set {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
    return _add(set._inner, value);
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(Bytes32Set storage set, bytes32 value)
    internal
    returns (bool)
  {
    return _remove(set._inner, value);
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(Bytes32Set storage set, bytes32 value)
    internal
    view
    returns (bool)
  {
    return _contains(set._inner, value);
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(Bytes32Set storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(Bytes32Set storage set, uint256 index)
    internal
    view
    returns (bytes32)
  {
    return _at(set._inner, index);
  }

  // AddressSet

  struct AddressSet {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(AddressSet storage set, address value) internal returns (bool) {
    return _add(set._inner, bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(AddressSet storage set, address value)
    internal
    returns (bool)
  {
    return _remove(set._inner, bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(AddressSet storage set, address value)
    internal
    view
    returns (bool)
  {
    return _contains(set._inner, bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(AddressSet storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(AddressSet storage set, uint256 index)
    internal
    view
    returns (address)
  {
    return address(uint160(uint256(_at(set._inner, index))));
  }

  // UintSet

  struct UintSet {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(UintSet storage set, uint256 value) internal returns (bool) {
    return _add(set._inner, bytes32(value));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(UintSet storage set, uint256 value) internal returns (bool) {
    return _remove(set._inner, bytes32(value));
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(UintSet storage set, uint256 value)
    internal
    view
    returns (bool)
  {
    return _contains(set._inner, bytes32(value));
  }

  /**
   * @dev Returns the number of values on the set. O(1).
   */
  function length(UintSet storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(UintSet storage set, uint256 index)
    internal
    view
    returns (uint256)
  {
    return uint256(_at(set._inner, index));
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMapUpgradeable {
  // To implement this library for multiple types with as little code
  // repetition as possible, we write it in terms of a generic Map type with
  // bytes32 keys and values.
  // The Map implementation uses private functions, and user-facing
  // implementations (such as Uint256ToAddressMap) are just wrappers around
  // the underlying Map.
  // This means that we can only create new EnumerableMaps for types that fit
  // in bytes32.

  struct MapEntry {
    bytes32 _key;
    bytes32 _value;
  }

  struct Map {
    // Storage of map keys and values
    MapEntry[] _entries;
    // Position of the entry defined by a key in the `entries` array, plus 1
    // because index 0 means a key is not in the map.
    mapping(bytes32 => uint256) _indexes;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function _set(
    Map storage map,
    bytes32 key,
    bytes32 value
  ) private returns (bool) {
    // We read and store the key's index to prevent multiple reads from the same storage slot
    uint256 keyIndex = map._indexes[key];

    if (keyIndex == 0) {
      // Equivalent to !contains(map, key)
      map._entries.push(MapEntry({_key: key, _value: value}));
      // The entry is stored at length-1, but we add 1 to all indexes
      // and use 0 as a sentinel value
      map._indexes[key] = map._entries.length;
      return true;
    } else {
      map._entries[keyIndex - 1]._value = value;
      return false;
    }
  }

  /**
   * @dev Removes a key-value pair from a map. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function _remove(Map storage map, bytes32 key) private returns (bool) {
    // We read and store the key's index to prevent multiple reads from the same storage slot
    uint256 keyIndex = map._indexes[key];

    if (keyIndex != 0) {
      // Equivalent to contains(map, key)
      // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
      // in the array, and then remove the last entry (sometimes called as 'swap and pop').
      // This modifies the order of the array, as noted in {at}.

      uint256 toDeleteIndex = keyIndex - 1;
      uint256 lastIndex = map._entries.length - 1;

      // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
      // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

      MapEntry storage lastEntry = map._entries[lastIndex];

      // Move the last entry to the index where the entry to delete is
      map._entries[toDeleteIndex] = lastEntry;
      // Update the index for the moved entry
      map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

      // Delete the slot where the moved entry was stored
      map._entries.pop();

      // Delete the index for the deleted slot
      delete map._indexes[key];

      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function _contains(Map storage map, bytes32 key) private view returns (bool) {
    return map._indexes[key] != 0;
  }

  /**
   * @dev Returns the number of key-value pairs in the map. O(1).
   */
  function _length(Map storage map) private view returns (uint256) {
    return map._entries.length;
  }

  /**
   * @dev Returns the key-value pair stored at position `index` in the map. O(1).
   *
   * Note that there are no guarantees on the ordering of entries inside the
   * array, and it may change when more entries are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function _at(Map storage map, uint256 index)
    private
    view
    returns (bytes32, bytes32)
  {
    require(map._entries.length > index, "EnumerableMap: index out of bounds");

    MapEntry storage entry = map._entries[index];
    return (entry._key, entry._value);
  }

  /**
   * @dev Tries to returns the value associated with `key`.  O(1).
   * Does not revert if `key` is not in the map.
   */
  function _tryGet(Map storage map, bytes32 key)
    private
    view
    returns (bool, bytes32)
  {
    uint256 keyIndex = map._indexes[key];
    if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
    return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
  }

  /**
   * @dev Returns the value associated with `key`.  O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function _get(Map storage map, bytes32 key) private view returns (bytes32) {
    uint256 keyIndex = map._indexes[key];
    require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
    return map._entries[keyIndex - 1]._value; // All indexes are 1-based
  }

  /**
   * @dev Same as {_get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {_tryGet}.
   */
  function _get(
    Map storage map,
    bytes32 key,
    string memory errorMessage
  ) private view returns (bytes32) {
    uint256 keyIndex = map._indexes[key];
    require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
    return map._entries[keyIndex - 1]._value; // All indexes are 1-based
  }

  // UintToAddressMap

  struct UintToAddressMap {
    Map _inner;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function set(
    UintToAddressMap storage map,
    uint256 key,
    address value
  ) internal returns (bool) {
    return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function remove(UintToAddressMap storage map, uint256 key)
    internal
    returns (bool)
  {
    return _remove(map._inner, bytes32(key));
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function contains(UintToAddressMap storage map, uint256 key)
    internal
    view
    returns (bool)
  {
    return _contains(map._inner, bytes32(key));
  }

  /**
   * @dev Returns the number of elements in the map. O(1).
   */
  function length(UintToAddressMap storage map)
    internal
    view
    returns (uint256)
  {
    return _length(map._inner);
  }

  /**
   * @dev Returns the element stored at position `index` in the set. O(1).
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(UintToAddressMap storage map, uint256 index)
    internal
    view
    returns (uint256, address)
  {
    (bytes32 key, bytes32 value) = _at(map._inner, index);
    return (uint256(key), address(uint160(uint256(value))));
  }

  /**
   * @dev Tries to returns the value associated with `key`.  O(1).
   * Does not revert if `key` is not in the map.
   *
   * _Available since v3.4._
   */
  function tryGet(UintToAddressMap storage map, uint256 key)
    internal
    view
    returns (bool, address)
  {
    (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
    return (success, address(uint160(uint256(value))));
  }

  /**
   * @dev Returns the value associated with `key`.  O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function get(UintToAddressMap storage map, uint256 key)
    internal
    view
    returns (address)
  {
    return address(uint160(uint256(_get(map._inner, bytes32(key)))));
  }

  /**
   * @dev Same as {get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryGet}.
   */
  function get(
    UintToAddressMap storage map,
    uint256 key,
    string memory errorMessage
  ) internal view returns (address) {
    return
      address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
  /**
   * @dev Converts a `uint256` to its ASCII `string` 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);
    uint256 index = digits - 1;
    temp = value;
    while (temp != 0) {
      buffer[index--] = bytes1(uint8(48 + (temp % 10)));
      temp /= 10;
    }
    return string(buffer);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @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 IERC165Upgradeable {
  /**
   * @dev Returns true if this contract implements the interface defined by
   * `interfaceId`. See the corresponding
   * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
   * to learn more about how these ids are created.
   *
   * This function call must use less than 30 000 gas.
   */
  function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
  /**
   * @dev Must return an address that can be used as a delegate call target.
   *
   * {BeaconProxy} will check that this address is a contract.
   */
  function implementation() external view returns (address);
}

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

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
  /**
   * @dev Delegates the current call to `implementation`.
   *
   * This function does not return to its internal call site, it will return directly to the external caller.
   */
  function _delegate(address implementation) internal virtual {
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize())

      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

      // Copy the returned data.
      returndatacopy(0, 0, returndatasize())

      switch result
      // delegatecall returns 0 on error.
      case 0 {
        revert(0, returndatasize())
      }
      default {
        return(0, returndatasize())
      }
    }
  }

  /**
   * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
   * and {_fallback} should delegate.
   */
  function _implementation() internal view virtual returns (address);

  /**
   * @dev Delegates the current call to the address returned by `_implementation()`.
   *
   * This function does not return to its internall call site, it will return directly to the external caller.
   */
  function _fallback() internal virtual {
    _beforeFallback();
    _delegate(_implementation());
  }

  /**
   * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
   * function in the contract matches the call data.
   */
  fallback() external payable virtual {
    _fallback();
  }

  /**
   * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
   * is empty.
   */
  receive() external payable virtual {
    _fallback();
  }

  /**
   * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
   * call, or as part of the Solidity `fallback` or `receive` functions.
   *
   * If overriden should call `super._beforeFallback()`.
   */
  function _beforeFallback() internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeacon.sol";
import "../../interfaces/draft-IERC1822.sol";
import "../../utils/Address.sol";
import "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967Upgrade {
  // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
  bytes32 private constant _ROLLBACK_SLOT =
    0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

  /**
   * @dev Storage slot with the address of the current implementation.
   * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
   * validated in the constructor.
   */
  bytes32 internal constant _IMPLEMENTATION_SLOT =
    0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

  /**
   * @dev Emitted when the implementation is upgraded.
   */
  event Upgraded(address indexed implementation);

  /**
   * @dev Returns the current implementation address.
   */
  function _getImplementation() internal view returns (address) {
    return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
  }

  /**
   * @dev Stores a new address in the EIP1967 implementation slot.
   */
  function _setImplementation(address newImplementation) private {
    require(
      Address.isContract(newImplementation),
      "ERC1967: new implementation is not a contract"
    );
    StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
  }

  /**
   * @dev Perform implementation upgrade
   *
   * Emits an {Upgraded} event.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }

  /**
   * @dev Perform implementation upgrade with additional setup call.
   *
   * Emits an {Upgraded} event.
   */
  function _upgradeToAndCall(
    address newImplementation,
    bytes memory data,
    bool forceCall
  ) internal {
    _upgradeTo(newImplementation);
    if (data.length > 0 || forceCall) {
      Address.functionDelegateCall(newImplementation, data);
    }
  }

  /**
   * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
   *
   * Emits an {Upgraded} event.
   */
  function _upgradeToAndCallUUPS(
    address newImplementation,
    bytes memory data,
    bool forceCall
  ) internal {
    // Upgrades from old implementations will perform a rollback test. This test requires the new
    // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
    // this special case will break upgrade paths from old UUPS implementation to new ones.
    if (StorageSlot.getBooleanSlot(_ROLLBACK_SLOT).value) {
      _setImplementation(newImplementation);
    } else {
      try IERC1822Proxiable(newImplementation).proxiableUUID() returns (
        bytes32 slot
      ) {
        require(
          slot == _IMPLEMENTATION_SLOT,
          "ERC1967Upgrade: unsupported proxiableUUID"
        );
      } catch {
        revert("ERC1967Upgrade: new implementation is not UUPS");
      }
      _upgradeToAndCall(newImplementation, data, forceCall);
    }
  }

  /**
   * @dev Storage slot with the admin of the contract.
   * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
   * validated in the constructor.
   */
  bytes32 internal constant _ADMIN_SLOT =
    0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

  /**
   * @dev Emitted when the admin account has changed.
   */
  event AdminChanged(address previousAdmin, address newAdmin);

  /**
   * @dev Returns the current admin.
   */
  function _getAdmin() internal view returns (address) {
    return StorageSlot.getAddressSlot(_ADMIN_SLOT).value;
  }

  /**
   * @dev Stores a new address in the EIP1967 admin slot.
   */
  function _setAdmin(address newAdmin) private {
    require(newAdmin != address(0), "ERC1967: new admin is the zero address");
    StorageSlot.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
  }

  /**
   * @dev Changes the admin of the proxy.
   *
   * Emits an {AdminChanged} event.
   */
  function _changeAdmin(address newAdmin) internal {
    emit AdminChanged(_getAdmin(), newAdmin);
    _setAdmin(newAdmin);
  }

  /**
   * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
   * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
   */
  bytes32 internal constant _BEACON_SLOT =
    0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

  /**
   * @dev Emitted when the beacon is upgraded.
   */
  event BeaconUpgraded(address indexed beacon);

  /**
   * @dev Returns the current beacon.
   */
  function _getBeacon() internal view returns (address) {
    return StorageSlot.getAddressSlot(_BEACON_SLOT).value;
  }

  /**
   * @dev Stores a new beacon in the EIP1967 beacon slot.
   */
  function _setBeacon(address newBeacon) private {
    require(
      Address.isContract(newBeacon),
      "ERC1967: new beacon is not a contract"
    );
    require(
      Address.isContract(IBeacon(newBeacon).implementation()),
      "ERC1967: beacon implementation is not a contract"
    );
    StorageSlot.getAddressSlot(_BEACON_SLOT).value = newBeacon;
  }

  /**
   * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
   * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
   *
   * Emits a {BeaconUpgraded} event.
   */
  function _upgradeBeaconToAndCall(
    address newBeacon,
    bytes memory data,
    bool forceCall
  ) internal {
    _setBeacon(newBeacon);
    emit BeaconUpgraded(newBeacon);
    if (data.length > 0 || forceCall) {
      Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
  /**
   * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
   * address.
   *
   * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
   * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
   * function revert if invoked through a proxy.
   */
  function proxiableUUID() external view returns (bytes32);
}

// 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);
      }
    }
  }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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