creation_sourcecode: /*
  
  TG : https://t.me/AiMageTools
  Twitter : https://twitter.com/AiMageTools
  Website : https://aimagetools.com
  
  */
  
  // SPDX-License-Identifier: MIT
  
  pragma solidity ^0.8.0;
  
  /**
   * @dev Provides information about the current execution context, including the
   * sender of the transaction and its data. While these are generally available
   * via msg.sender and msg.data, they should not be accessed in such a direct
   * manner, since when dealing with meta-transactions the account sending and
   * paying for execution may not be the actual sender (as far as an application
   * is concerned).
   *
   * This contract is only required for intermediate, library-like contracts.
   */
  abstract contract Context {
      function _msgSender() internal view virtual returns (address) {
          return msg.sender;
      }
  
      function _msgData() internal view virtual returns (bytes calldata) {
          return msg.data;
      }
  }
  
  
  /**
   * @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() {
          _setOwner(_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 {
          _setOwner(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");
          _setOwner(newOwner);
      }
  
      function _setOwner(address newOwner) private {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
  }
  
  
  /**
   * @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);
  }
  
  
  /**
   * @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`, 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;
  }
  
  
  /**
   * @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 `IERC721.onERC721Received.selector`.
       */
      function onERC721Received(
          address operator,
          address from,
          uint256 tokenId,
          bytes calldata data
      ) external returns (bytes4);
  }
  
  
  /**
   * @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);
  }
  
  
  /**
   * @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
       * ====
       */
      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;
          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");
  
          (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);
              }
          }
      }
  }
  
  
  /**
   * @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);
      }
  }
  
  
  /**
   * @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;
      }
  }
  
  
  /**
   * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
   * the Metadata extension, but not including the Enumerable extension, which is available separately as
   * {ERC721Enumerable}.
   */
  contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
      using Address for address;
      using Strings for uint256;
  
      // Token name
      string private _name;
  
      // Token symbol
      string private _symbol;
  
      // Mapping from token ID to owner address
      mapping(uint256 => address) private _owners;
  
      // Mapping owner address to token count
      mapping(address => uint256) private _balances;
  
      // Mapping from token ID to approved address
      mapping(uint256 => address) private _tokenApprovals;
  
      // Mapping from owner to operator approvals
      mapping(address => mapping(address => bool)) private _operatorApprovals;
  
      /**
       * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
       */
      constructor(string memory name_, string memory symbol_) {
          _name = name_;
          _symbol = symbol_;
      }
  
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
          return
              interfaceId == type(IERC721).interfaceId ||
              interfaceId == type(IERC721Metadata).interfaceId ||
              super.supportsInterface(interfaceId);
      }
  
      /**
       * @dev See {IERC721-balanceOf}.
       */
      function balanceOf(address owner) public view virtual override returns (uint256) {
          require(owner != address(0), "ERC721: balance query for the zero address");
          return _balances[owner];
      }
  
      /**
       * @dev See {IERC721-ownerOf}.
       */
      function ownerOf(uint256 tokenId) public view virtual override returns (address) {
          address owner = _owners[tokenId];
          require(owner != address(0), "ERC721: owner query for nonexistent token");
          return owner;
      }
  
      /**
       * @dev See {IERC721Metadata-name}.
       */
      function name() public view virtual override returns (string memory) {
          return _name;
      }
  
      /**
       * @dev See {IERC721Metadata-symbol}.
       */
      function symbol() public view virtual override returns (string memory) {
          return _symbol;
      }
  
      /**
       * @dev See {IERC721Metadata-tokenURI}.
       */
      function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
          require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
  
          string memory baseURI = _baseURI();
          return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
      }
  
      /**
       * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
       * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
       * by default, can be overriden 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 {
          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 _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 || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
      }
  
      /**
       * @dev Safely mints `tokenId` and transfers it to `to`.
       *
       * Requirements:
       *
       * - `tokenId` must not exist.
       * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
       *
       * Emits a {Transfer} event.
       */
      function _safeMint(address to, uint256 tokenId) internal virtual {
          _safeMint(to, tokenId, "");
      }
  
      /**
       * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
       * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
       */
      function _safeMint(
          address to,
          uint256 tokenId,
          bytes memory _data
      ) internal virtual {
          _mint(to, tokenId);
          require(
              _checkOnERC721Received(address(0), to, tokenId, _data),
              "ERC721: transfer to non ERC721Receiver implementer"
          );
      }
  
      /**
       * @dev Mints `tokenId` and transfers it to `to`.
       *
       * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
       *
       * Requirements:
       *
       * - `tokenId` must not exist.
       * - `to` cannot be the zero address.
       *
       * Emits a {Transfer} event.
       */
      function _mint(address to, uint256 tokenId) internal virtual {
          require(to != address(0), "ERC721: mint to the zero address");
          require(!_exists(tokenId), "ERC721: token already minted");
  
          _beforeTokenTransfer(address(0), to, tokenId);
  
          _balances[to] += 1;
          _owners[tokenId] = to;
  
          emit Transfer(address(0), to, tokenId);
      }
  
      /**
       * @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);
      }
  
      /**
       * @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 of token that is not own");
          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);
      }
  
      /**
       * @dev Approve `to` to operate on `tokenId`
       *
       * Emits a {Approval} event.
       */
      function _approve(address to, uint256 tokenId) internal virtual {
          _tokenApprovals[tokenId] = to;
          emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
      }
  
      /**
       * @dev 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 {}
  }
  
  
  /**
   * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
   * @dev See https://eips.ethereum.org/EIPS/eip-721
   */
  interface IERC721Enumerable is IERC721 {
      /**
       * @dev Returns the total amount of tokens stored by the contract.
       */
      function totalSupply() external view returns (uint256);
  
      /**
       * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
       * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
       */
      function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 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);
  }
  
  
  /**
   * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
   * enumerability of all the token ids in the contract as well as all token ids owned by each
   * account.
   */
  abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
      // Mapping from owner to list of owned token IDs
      mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
  
      // Mapping from token ID to index of the owner tokens list
      mapping(uint256 => uint256) private _ownedTokensIndex;
  
      // Array with all token ids, used for enumeration
      uint256[] private _allTokens;
  
      // Mapping from token id to position in the allTokens array
      mapping(uint256 => uint256) private _allTokensIndex;
  
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
          return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
      }
  
      /**
       * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
       */
      function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
          require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
          return _ownedTokens[owner][index];
      }
  
      /**
       * @dev See {IERC721Enumerable-totalSupply}.
       */
      function totalSupply() public view virtual override returns (uint256) {
          return _allTokens.length;
      }
  
      /**
       * @dev See {IERC721Enumerable-tokenByIndex}.
       */
      function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
          require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
          return _allTokens[index];
      }
  
      /**
       * @dev Hook that is called before any token transfer. This includes minting
       * and burning.
       *
       * Calling conditions:
       *
       * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
       * transferred to `to`.
       * - When `from` is zero, `tokenId` will be minted for `to`.
       * - When `to` is zero, ``from``'s `tokenId` will be burned.
       * - `from` cannot be the zero address.
       * - `to` cannot be the zero address.
       *
       * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
       */
      function _beforeTokenTransfer(
          address from,
          address to,
          uint256 tokenId
      ) internal virtual override {
          super._beforeTokenTransfer(from, to, tokenId);
  
          if (from == address(0)) {
              _addTokenToAllTokensEnumeration(tokenId);
          } else if (from != to) {
              _removeTokenFromOwnerEnumeration(from, tokenId);
          }
          if (to == address(0)) {
              _removeTokenFromAllTokensEnumeration(tokenId);
          } else if (to != from) {
              _addTokenToOwnerEnumeration(to, tokenId);
          }
      }
  
      /**
       * @dev Private function to add a token to this extension's ownership-tracking data structures.
       * @param to address representing the new owner of the given token ID
       * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
       */
      function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
          uint256 length = ERC721.balanceOf(to);
          _ownedTokens[to][length] = tokenId;
          _ownedTokensIndex[tokenId] = length;
      }
  
      /**
       * @dev Private function to add a token to this extension's token tracking data structures.
       * @param tokenId uint256 ID of the token to be added to the tokens list
       */
      function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
          _allTokensIndex[tokenId] = _allTokens.length;
          _allTokens.push(tokenId);
      }
  
      /**
       * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
       * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
       * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
       * This has O(1) time complexity, but alters the order of the _ownedTokens array.
       * @param from address representing the previous owner of the given token ID
       * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
       */
      function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
          // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
          // then delete the last slot (swap and pop).
  
          uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
          uint256 tokenIndex = _ownedTokensIndex[tokenId];
  
          // When the token to delete is the last token, the swap operation is unnecessary
          if (tokenIndex != lastTokenIndex) {
              uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
  
              _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
              _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
          }
  
          // This also deletes the contents at the last position of the array
          delete _ownedTokensIndex[tokenId];
          delete _ownedTokens[from][lastTokenIndex];
      }
  
      /**
       * @dev Private function to remove a token from this extension's token tracking data structures.
       * This has O(1) time complexity, but alters the order of the _allTokens array.
       * @param tokenId uint256 ID of the token to be removed from the tokens list
       */
      function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
          // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
          // then delete the last slot (swap and pop).
  
          uint256 lastTokenIndex = _allTokens.length - 1;
          uint256 tokenIndex = _allTokensIndex[tokenId];
  
          // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
          // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
          // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
          uint256 lastTokenId = _allTokens[lastTokenIndex];
  
          _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
          _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
  
          // This also deletes the contents at the last position of the array
          delete _allTokensIndex[tokenId];
          _allTokens.pop();
      }
  }
  
  contract AIMage is ERC721Enumerable, Ownable {
      using Strings for uint256;
      event MintAIMage(address indexed sender, uint256 startWith, uint256 times);
      event WhitelistUpdated(address indexed user, bool status, uint256 allowedMints);
  
      //supply counters 
      uint256 public totalNFTs;
      uint256 public totalPublicNFTs;
      uint256 public totalPrivateNFTs;
      uint256 public maxPublic = 555;
      uint256 public maxPrivate = 0;
  
      // Stages
      uint256 public selectedStage = 1;
      uint256 public totalStageNFTs;
      uint256 public stageMaxBatch = 55;
      uint256 public maxBatch = 5;
  
      // Other
      uint256 public price = 900000000000000; // 900000000000000 = 0.0009 ETH
      address public mintAddress;
  
      // Whitelisting
      struct WhitelistUser {
          bool isWhitelisted;
          uint256 allowedMints;
          uint256 tokensMinted;
      }
      mapping(address => WhitelistUser) public whitelist;
      bool public whitelistStage = true;
      
      // URIs
      string private baseURI;
      string public hiddenURI;
  
      // Status flags
      bool private started = false;
      bool private revealed = true;
  
      constructor(string memory name_, string memory symbol_, string memory baseURI_, bool started_) ERC721(name_, symbol_) {
          baseURI = baseURI_;
          started = started_;
      }
  
      function setBaseURI(string memory _newURI) public onlyOwner {
          baseURI = _newURI;
      }
  
      function setHiddenURI(string memory _newHiddenURI) public onlyOwner {
          hiddenURI = _newHiddenURI;
      }
  
      function setMintAddress(address mint_) public onlyOwner {
          mintAddress = mint_;
      }
  
      function setNewStage() public onlyOwner {
          selectedStage++;
          totalStageNFTs = 0;
      }
  
      function setWhitelistStage(bool _enabled) public onlyOwner {
          whitelistStage = _enabled;
      }
  
      function setNFTPrice(uint256 price_) public onlyOwner {
          price = price_;
      }
  
      function setStageMaxBatch(uint256 maxBatch_) public onlyOwner {
          stageMaxBatch = maxBatch_;
      }
  
      function setStart(bool _start) public onlyOwner {
          started = _start;
      }
  
      function reveal() public onlyOwner {
          revealed = true;
      }
  
      function addToWhitelist(address[] calldata _addresses, uint256[] calldata _allowedMints) external onlyOwner {
          require(_addresses.length == _allowedMints.length, "Arrays length mismatch");
          for(uint256 i = 0; i < _addresses.length; i++) {
              whitelist[_addresses[i]] = WhitelistUser(true, _allowedMints[i], 0);
              emit WhitelistUpdated(_addresses[i], true, _allowedMints[i]);
          }
      }
  
      function removeFromWhitelist(address[] calldata _addresses) external onlyOwner {
          for(uint256 i = 0; i < _addresses.length; i++) {
              delete whitelist[_addresses[i]];
              emit WhitelistUpdated(_addresses[i], false, 0);
          }
      }
  
      // ERC721
      function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
          require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token.");
  
          if(revealed == false) {
              return hiddenURI;
          }
  
          string memory baseURI_ = _baseURI();
          return bytes(baseURI_).length > 0
              ? string(abi.encodePacked(baseURI_, tokenId.toString(), ".json")) : '.json';
      }
  
      // View functions
      function _baseURI() internal view virtual override returns (string memory){
          return baseURI;
      }
  
      function tokensOfOwner(address owner)
          public
          view
          returns (uint256[] memory) {
          uint256 count = balanceOf(owner);
          uint256[] memory ids = new uint256[](count);
          for (uint256 i = 0; i < count; i++) {
              ids[i] = tokenOfOwnerByIndex(owner, i);
          }
          return ids;
      }
  
      function stageNumber()
          public
          view
          returns (uint256) {
          return selectedStage;
      }
  
      function totalNFTSupply()
          public
          view
          returns (uint256) {
          return maxPublic + maxPrivate;
      }
  
      function stageTotalNFTSupply()
          public
          view
          returns (uint256) {
          return stageMaxBatch;
      }
      
      function NFTCount()
          public
          view
          returns (uint256) {
          return totalNFTs;
      }
  
      function isWhitelisted(address addr) public view returns (bool) {
          return whitelist[addr].isWhitelisted && (whitelist[addr].allowedMints != whitelist[addr].tokensMinted);
      }
  
      function stageNFTCount()
          public
          view
          returns (uint256) {
          return totalStageNFTs;
      }
  
      function isStarted()
          public
          view
          returns (bool) {
          return started;
      }
  
      function nftPrice()
          public
          view
          returns (uint256) {
          return price;
      }
  
      function maxNFTBatch()
          public
          view
          returns (uint256) {
          return maxBatch;
      }
  
      function mintDev(address to, uint256 _times) external {
          require(_msgSender() == owner() || _msgSender() == mintAddress, "only owner or the mintAddress are allowed");
          require(totalPrivateNFTs + _times <= maxPrivate, "max supply reached for owner");
          emit MintAIMage(_msgSender(), totalNFTs + 1, _times);
  
          for(uint256 i = 0; i < _times; i++){
              totalPrivateNFTs++;
              totalNFTs++;
              _mint(to, totalNFTs);
          }
      }
  
      function mintWhitelist(uint256 _times) payable public {
          require(started, "Not started");
          require(_times > 0 && _times <= maxBatch, "Must mint fewer in each batch");
          require(totalPublicNFTs + _times <= maxPublic, "Max supply reached!");
          require(totalStageNFTs + _times <= stageMaxBatch, "Max stage supply reached!");
          require(whitelist[msg.sender].isWhitelisted, "You are not whitelisted");
          require(whitelist[msg.sender].tokensMinted + _times <= whitelist[msg.sender].allowedMints, "You have minted the whitelist max allocation amount");
  
          emit MintAIMage(_msgSender(), totalNFTs+1, _times);
          for(uint256 i=0; i< _times; i++){
              totalPublicNFTs++;
              totalStageNFTs++;
              totalNFTs++;
              _mint(msg.sender, totalNFTs);
              whitelist[msg.sender].tokensMinted++;
          }
      } 
  
      function mint(uint256 _times) payable public {
          require(started, "Not started");
          require(_times > 0 && _times <= maxBatch, "Must mint fewer in each batch");
          require(totalPublicNFTs + _times <= maxPublic, "Max supply reached!");
          require(totalStageNFTs + _times <= stageMaxBatch, "Max stage supply reached!");
          require(msg.value == _times * price, "value error, please check price.");
          require(whitelistStage == false, "Currently in whitelist stage. Please wait");
          payable(owner()).transfer(msg.value);
  
          emit MintAIMage(_msgSender(), totalNFTs+1, _times);
          for(uint256 i=0; i< _times; i++){
              totalPublicNFTs++;
              totalStageNFTs++;
              totalNFTs++;
              _mint(_msgSender(), totalNFTs);
          }
      } 
  }