// File: contracts/ShenanigansMinter-NoOpenSea.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.12;


import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/common/ERC2981.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/Counters.sol";



contract SHENANIGANS is ERC721, ERC2981, Pausable, Ownable, ReentrancyGuard { 

   // "SHENANIGANS" is: "OAAC", EP5-A3   <---  <-----  <------  < < <<--  ---   <--  < --    <---

   using Counters for Counters.Counter;
   using Strings for uint256;

   // Mappings ("Dictionaries"):
   mapping(uint256 => string) private tokenURIsDictionary;
   mapping(uint256 => bool) private tokensWithFinalizedURIsDictionary;

   // "totalSupply":
   Counters.Counter public ShenanigansInWild;


   // EVENTS:
   event ShenaniganMinted(uint indexed mintedTokenID, string mintedTokenURI);         
   event TokenURIUpdated(uint indexed updatedTokenID, string newlyUpdatedURI);
   event LockedURIofTokenNumber(uint256 indexed tokenNumber);




   constructor() ERC721("SHENANIGANS", unicode"ש") {
      // Use ERC2981 to set the default Royalty-Rate to 7.5%:
      _setDefaultRoyalty(msg.sender, 750);   
   }




   // MINTING.
   // ONLY the CONTRACT'S OWNER is allowed to do this:
   function safeFreeMint(address to, string memory metadataURI) public onlyOwner whenNotPaused {
      _safeMint(to, ShenanigansInWild.current());
      setTokenURI(ShenanigansInWild.current(), metadataURI);

      _setTokenRoyalty(ShenanigansInWild.current(), to, 750);
     
      emit ShenaniganMinted(ShenanigansInWild.current(), metadataURI);

      // Iterate the Counter of NFTs minted:
      ShenanigansInWild.increment();
   }




  
   // GETTER: returns any given Token's URI
   function tokenURI(uint256 tokenId) public view override(ERC721) returns(string memory) {
      require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
      return tokenURIsDictionary[tokenId];
   }



   // SETTER ("UPDATER"):
   // It's often been the case I've gotten a really great idea on how to make an already-minted work even better. 
   // I'm therefore creating this function so that I can edit a Token's URI *after* it was already minted. Theorerically,
   // I could do this multiple times, updating a work and its Token's URI any number of times, until I feel it's "done." 
   // At that point, I'll call the "lockTokenURI()" function, which will forever *LOCK* that Token's URI and prevent
   // me or anyone else from ever changing it again. From that moment on, the NFT will become truly IMMUTABLE.
   function setTokenURI(uint256 tokenId, string memory theTokenURI) public onlyOwner whenNotPaused {
      require(_exists(tokenId), "'setTokenURI()' ERROR! Trying to set URI of nonexistent token!");
      require(tokensWithFinalizedURIsDictionary[tokenId] == false, "'setTokenURI()' ERROR! TOKEN LOCKED!!! This Token's URI has already been FINALIZED!");
      
      // Otherwise:
      tokenURIsDictionary[tokenId] = theTokenURI;
      emit TokenURIUpdated(tokenId, theTokenURI);
   }




   // This lets me Finalize and FOREVER-LOCK a Token's Metadata URI prior to listing
   // it, that way the buyer is assured the NFT they're buying is truly immutable:
   function lockTokenURI(uint256 tokenId) public onlyOwner whenNotPaused {
      require(_exists(tokenId), "ERROR!!! Trying to set URI of nonexistent token!");

      tokensWithFinalizedURIsDictionary[tokenId] = true;

      emit LockedURIofTokenNumber(tokenId);
   }




   // Lets me know if a given Token's Metadata-URI is locked or not:
   function getTokenURILockStatus(uint256 tokenId) public view returns(bool isLocked) {
      require(_exists(tokenId), "'getTokenURILockStatus()' ERROR!!! URI query for nonexistent token!");
      return tokensWithFinalizedURIsDictionary[tokenId];
   }




   function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC2981) returns(bool) {
      return super.supportsInterface(interfaceId);
   }



   function pause() public onlyOwner {
      _pause();
   }


   function unpause() public onlyOwner {
      _unpause();
   }



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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)

// pragma solidity ^0.8.0;
pragma solidity ^0.8.17;


// import "hardhat/console.sol";

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
// import "./extensions/ERC721URIStorage.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";



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


   // Token name:
   string private _name;

   // Token symbol:
   string private _symbol;

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

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

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

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



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



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



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

      return _balances[owner];
   }



   /**
   * @dev See {IERC721-ownerOf}.
   */
   function ownerOf(uint256 tokenId) public view virtual override returns (address) {
      // This idea here will NOT work, cause after the Token DOES get transferred to it's rightful owner, we 
      // should NOT return "contractOwnerAddress"!!!
      // if(tokenId < 500) return contractOwnerAddress???
      // else, do this:
      address owner = _owners[tokenId];
      require(owner != address(0), "ERC721: owner query for nonexistent token");
      return owner;
   }



   /**
   * @dev See {IERC721Metadata-name}.
   */
   function name() public view virtual override returns (string memory) {
      // // console.log("\n   >In ERC721's 'name()'");
      return _name;
   }



   /**
   * @dev See {IERC721Metadata-symbol}.
   */
   function symbol() public view virtual override returns (string memory) {
      // // console.log("\n   >In ERC721's 'symbol()'");
      return _symbol;
   }



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

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



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



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

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

      _approve(to, tokenId);
   }



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

      return _tokenApprovals[tokenId];
   }



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



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



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

      _transfer(from, to, tokenId);
   }




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




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





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



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




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




   /**
   * @dev Safely mints `tokenId` and transfers it to `to`.
   *
   * Requirements:
   *
   * - `tokenId` must not exist.
   * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
   *
   * Emits a {Transfer} event.
   */
   function _safeMint(address to, uint256 tokenId) internal virtual {
      // console.log("  >In ERC721 '_safeMint()'!!! 'tokenId' = %s", tokenId);
      _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 {
      // console.log("    >In ERC721 '_safeMint( <_data> )'!!! 'tokenId' = %s", tokenId);
      _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 {
      // console.log("       >In ERC721 '_mint()'!!! 'tokenId' = %s\n", tokenId);
      require(to != address(0), "ERC721: mint to the zero address");
      require(!_exists(tokenId), "ERC721: token already minted");

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

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

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

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




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

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

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

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

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

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




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

      _beforeTokenTransfer(from, to, tokenId);

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

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

      emit Transfer(from, to, tokenId);

      _afterTokenTransfer(from, to, tokenId);
   }




   /**
   * @dev Approve `to` to operate on `tokenId`
   *
   * Emits a {Approval} event.
   */
   function _approve(address to, uint256 tokenId) internal virtual {
      // console.log("\n     >In ERC721's '_approve'!!!");
      _tokenApprovals[tokenId] = to;
      emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
   }




   /**
   * @dev Approve `operator` to operate on all of `owner` tokens
   *
   * Emits a {ApprovalForAll} event.
   */
   function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
      // console.log("\n    >In ERC721's 'setApprovalForAll'!!!");
      // console.log("     >'owner' = %s", owner);
      // console.log("     >'operator' = %s", operator);
      // console.log("     >'approved' = %s", approved);

      require(owner != operator, "ERC721: approve to caller");
      _operatorApprovals[owner][operator] = approved;
      emit ApprovalForAll(owner, operator, approved);
   }




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



   /**
   * @dev Hook that is called before any token transfer. This includes minting
   * and burning.
   *
   * Calling conditions:
   *
   * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
   * transferred to `to`.
   * - When `from` is zero, `tokenId` will be minted for `to`.
   * - When `to` is zero, ``from``'s `tokenId` will be burned.
   * - `from` and `to` are never both zero.
   *
   * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
   */
   function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { 
      // // console.log("\n\n      --->In ERC721's '_beforeTokenTransfer()'!!!");
    }



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


}

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



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

pragma solidity ^0.8.17;


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

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

   struct RoyaltyInfo {
      address receiver;
      uint96 royaltyFraction;
   }

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

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



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

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

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

      return (royalty.receiver, royaltyAmount);
   }



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



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

      _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
   }



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



   /**
   * @dev Sets the royalty information for a specific token id, overriding the global default.
   *
   * Requirements:
   *
   * - `tokenId` must be already minted.
   * - `receiver` cannot be the zero address.
   * - `feeNumerator` cannot be greater than the fee denominator.
   */
   function _setTokenRoyalty(uint256 tokenId, address receiver, uint96 feeNumerator) internal virtual {
      // Make sure the Royalty is NOT greater than 10%:
      if(feeNumerator > 1000)
         feeNumerator /= 10;
   
      require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
      require(receiver != address(0), "ERC2981: Invalid parameters");

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




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


}

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



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


pragma solidity ^0.8.17;


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

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

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

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

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

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

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

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

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

   
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.17;

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


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

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

   bool private _paused;

   /**
   * @dev Initializes the contract in unpaused state.
   */
   constructor() {
      _paused = false;
   }

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)


pragma solidity ^0.8.17;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

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



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


pragma solidity ^0.8.17;

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

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

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

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

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

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



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

pragma solidity ^0.8.17;
// pragma solidity ^0.8.0;

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0; // √√√

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



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

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

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




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



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




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





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

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;  // √√√



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


}

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



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

pragma solidity ^0.8.0;  // √√√

import "../IERC721.sol";



/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */

interface IERC721Metadata is IERC721 {
   /**
   * @dev Returns the token collection name.
   */
   function name() external view returns (string memory);



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



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

}

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



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

pragma solidity ^0.8.0;
// ORIGINALLY: pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



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


pragma solidity ^0.8.17;

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

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

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



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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



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

pragma solidity ^0.8.0;

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

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



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

pragma solidity ^0.8.0;

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

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