// SPDX-License-Identifier: MIT
/*Developer Info:
  Written by Meraj Bugti Blockchain Developer @ www.themetaconcepts.com
  Email: iintadeveloper@gmail.com */

// File: @openzeppelin/contracts/utils/Strings.sol

// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

    pragma solidity ^0.8.0;

    /**
    * @dev String operations.
    */
    library Strings {
        bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

        /**
        * @dev Converts a `uint256` to its ASCII `string` decimal representation.
        */
        function toString(uint256 value) internal pure returns (string memory) {
            // Inspired by OraclizeAPI's implementation - MIT licence
            // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

            if (value == 0) {
                return "0";
            }
            uint256 temp = value;
            uint256 digits;
            while (temp != 0) {
                digits++;
                temp /= 10;
            }
            bytes memory buffer = new bytes(digits);
            while (value != 0) {
                digits -= 1;
                buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
                value /= 10;
            }
            return string(buffer);
        }

        /**
        * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
        */
        function toHexString(uint256 value) internal pure returns (string memory) {
            if (value == 0) {
                return "0x00";
            }
            uint256 temp = value;
            uint256 length = 0;
            while (temp != 0) {
                length++;
                temp >>= 8;
            }
            return toHexString(value, length);
        }

        /**
        * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
        */
        function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
            bytes memory buffer = new bytes(2 * length + 2);
            buffer[0] = "0";
            buffer[1] = "x";
            for (uint256 i = 2 * length + 1; i > 1; --i) {
                buffer[i] = _HEX_SYMBOLS[value & 0xf];
                value >>= 4;
            }
            require(value == 0, "Strings: hex length insufficient");
            return string(buffer);
        }
    }

    // File: @openzeppelin/contracts/utils/Context.sol


    // OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

    pragma solidity ^0.8.0;

    /**
    * @dev Provides information about the current execution context, including the
    * sender of the transaction and its data. While these are generally available
    * via msg.sender and msg.data, they should not be accessed in such a direct
    * manner, since when dealing with meta-transactions the account sending and
    * paying for execution may not be the actual sender (as far as an application
    * is concerned).
    *
    * This contract is only required for intermediate, library-like contracts.
    */
    abstract contract Context {
        function _msgSender() internal view virtual returns (address) {
            return msg.sender;
        }

        function _msgData() internal view virtual returns (bytes calldata) {
            return msg.data;
        }
    }

    // File: @openzeppelin/contracts/utils/Address.sol


    // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

    pragma solidity ^0.8.1;

    /**
    * @dev Collection of functions related to the address type
    */
    library Address {
        /**
        * @dev Returns true if `account` is a contract.
        *
        * [IMPORTANT]
        * ====
        * It is unsafe to assume that an address for which this function returns
        * false is an externally-owned account (EOA) and not a contract.
        *
        * Among others, `isContract` will return false for the following
        * types of addresses:
        *
        *  - an externally-owned account
        *  - a contract in construction
        *  - an address where a contract will be created
        *  - an address where a contract lived, but was destroyed
        * ====
        *
        * [IMPORTANT]
        * ====
        * You shouldn't rely on `isContract` to protect against flash loan attacks!
        *
        * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
        * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
        * constructor.
        * ====
        */
        function isContract(address account) internal view returns (bool) {
            // This method relies on extcodesize/address.code.length, which returns 0
            // for contracts in construction, since the code is only stored at the end
            // of the constructor execution.

            return account.code.length > 0;
        }

        /**
        * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
        * `recipient`, forwarding all available gas and reverting on errors.
        *
        * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
        * of certain opcodes, possibly making contracts go over the 2300 gas limit
        * imposed by `transfer`, making them unable to receive funds via
        * `transfer`. {sendValue} removes this limitation.
        *
        * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
        *
        * IMPORTANT: because control is transferred to `recipient`, care must be
        * taken to not create reentrancy vulnerabilities. Consider using
        * {ReentrancyGuard} or the
        * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
        */
        function sendValue(address payable recipient, uint256 amount) internal {
            require(address(this).balance >= amount, "Address: insufficient balance");

            (bool success, ) = recipient.call{value: amount}("");
            require(success, "Address: unable to send value, recipient may have reverted");
        }

        /**
        * @dev Performs a Solidity function call using a low level `call`. A
        * plain `call` is an unsafe replacement for a function call: use this
        * function instead.
        *
        * If `target` reverts with a revert reason, it is bubbled up by this
        * function (like regular Solidity function calls).
        *
        * Returns the raw returned data. To convert to the expected return value,
        * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
        *
        * Requirements:
        *
        * - `target` must be a contract.
        * - calling `target` with `data` must not revert.
        *
        * _Available since v3.1._
        */
        function functionCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionCall(target, data, "Address: low-level call failed");
        }

        /**
        * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
        * `errorMessage` as a fallback revert reason when `target` reverts.
        *
        * _Available since v3.1._
        */
        function functionCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal returns (bytes memory) {
            return functionCallWithValue(target, data, 0, errorMessage);
        }

        /**
        * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
        * but also transferring `value` wei to `target`.
        *
        * Requirements:
        *
        * - the calling contract must have an ETH balance of at least `value`.
        * - the called Solidity function must be `payable`.
        *
        * _Available since v3.1._
        */
        function functionCallWithValue(
            address target,
            bytes memory data,
            uint256 value
        ) internal returns (bytes memory) {
            return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
        }

        /**
        * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
        * with `errorMessage` as a fallback revert reason when `target` reverts.
        *
        * _Available since v3.1._
        */
        function functionCallWithValue(
            address target,
            bytes memory data,
            uint256 value,
            string memory errorMessage
        ) internal returns (bytes memory) {
            require(address(this).balance >= value, "Address: insufficient balance for call");
            require(isContract(target), "Address: call to non-contract");

            (bool success, bytes memory returndata) = target.call{value: value}(data);
            return verifyCallResult(success, returndata, errorMessage);
        }

        /**
        * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
        * but performing a static call.
        *
        * _Available since v3.3._
        */
        function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
            return functionStaticCall(target, data, "Address: low-level static call failed");
        }

        /**
        * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
        * but performing a static call.
        *
        * _Available since v3.3._
        */
        function functionStaticCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal view returns (bytes memory) {
            require(isContract(target), "Address: static call to non-contract");

            (bool success, bytes memory returndata) = target.staticcall(data);
            return verifyCallResult(success, returndata, errorMessage);
        }

        /**
        * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
        * but performing a delegate call.
        *
        * _Available since v3.4._
        */
        function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
            return functionDelegateCall(target, data, "Address: low-level delegate call failed");
        }

        /**
        * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
        * but performing a delegate call.
        *
        * _Available since v3.4._
        */
        function functionDelegateCall(
            address target,
            bytes memory data,
            string memory errorMessage
        ) internal returns (bytes memory) {
            require(isContract(target), "Address: delegate call to non-contract");

            (bool success, bytes memory returndata) = target.delegatecall(data);
            return verifyCallResult(success, returndata, errorMessage);
        }

        /**
        * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
        * revert reason using the provided one.
        *
        * _Available since v4.3._
        */
        function verifyCallResult(
            bool success,
            bytes memory returndata,
            string memory errorMessage
        ) internal pure returns (bytes memory) {
            if (success) {
                return returndata;
            } else {
                // Look for revert reason and bubble it up if present
                if (returndata.length > 0) {
                    // The easiest way to bubble the revert reason is using memory via assembly

                    assembly {
                        let returndata_size := mload(returndata)
                        revert(add(32, returndata), returndata_size)
                    }
                } else {
                    revert(errorMessage);
                }
            }
        }
    }

    // File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol


    // OpenZeppelin Contracts v4.4.1 (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 `IERC721.onERC721Received.selector`.
        */
        function onERC721Received(
            address operator,
            address from,
            uint256 tokenId,
            bytes calldata data
        ) external returns (bytes4);
    }

    // File: @openzeppelin/contracts/utils/introspection/IERC165.sol


    // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

    pragma solidity ^0.8.0;

    /**
    * @dev Interface of the ERC165 standard, as defined in the
    * https://eips.ethereum.org/EIPS/eip-165[EIP].
    *
    * Implementers can declare support of contract interfaces, which can then be
    * queried by others ({ERC165Checker}).
    *
    * For an implementation, see {ERC165}.
    */
    interface IERC165 {
        /**
        * @dev Returns true if this contract implements the interface defined by
        * `interfaceId`. See the corresponding
        * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
        * to learn more about how these ids are created.
        *
        * This function call must use less than 30 000 gas.
        */
        function supportsInterface(bytes4 interfaceId) external view returns (bool);
    }

    // File: @openzeppelin/contracts/utils/introspection/ERC165.sol


    // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

    pragma solidity ^0.8.0;


    /**
    * @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/token/ERC721/IERC721.sol


    // OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

    pragma solidity ^0.8.0;


    /**
    * @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;
    }

    // File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol


    // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

    pragma solidity ^0.8.0;


    /**
    * @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: contracts/new.sol




    pragma solidity ^0.8.4;

    error ApprovalCallerNotOwnerNorApproved();
    error ApprovalQueryForNonexistentToken();
    error ApproveToCaller();
    error ApprovalToCurrentOwner();
    error BalanceQueryForZeroAddress();
    error MintToZeroAddress();
    error MintZeroQuantity();
    error OwnerQueryForNonexistentToken();
    error TransferCallerNotOwnerNorApproved();
    error TransferFromIncorrectOwner();
    error TransferToNonERC721ReceiverImplementer();
    error TransferToZeroAddress();
    error URIQueryForNonexistentToken();

    /**
    * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
    * the Metadata extension. Built to optimize for lower gas during batch mints.
    *
    * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..).
    *
    * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
    *
    * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).
    */
    contract ERC721A is Context, ERC165, IERC721, IERC721Metadata {
        using Address for address;
        using Strings for uint256;

        // Compiler will pack this into a single 256bit word.
        struct TokenOwnership {
            // The address of the owner.
            address addr;
            // Keeps track of the start time of ownership with minimal overhead for tokenomics.
            uint64 startTimestamp;
            // Whether the token has been burned.
            bool burned;
        }

        // Compiler will pack this into a single 256bit word.
        struct AddressData {
            // Realistically, 2**64-1 is more than enough.
            uint64 balance;
            // Keeps track of mint count with minimal overhead for tokenomics.
            uint64 numberMinted;
            // Keeps track of burn count with minimal overhead for tokenomics.
            uint64 numberBurned;
            // For miscellaneous variable(s) pertaining to the address
            // (e.g. number of whitelist mint slots used).
            // If there are multiple variables, please pack them into a uint64.
            uint64 aux;
        }

        // The tokenId of the next token to be minted.
        uint256 internal _currentIndex;

        // The number of tokens burned.
        uint256 internal _burnCounter;

        // Token name
        string private _name;

        // Token symbol
        string private _symbol;

        // Mapping from token ID to ownership details
        // An empty struct value does not necessarily mean the token is unowned. See _ownershipOf implementation for details.
        mapping(uint256 => TokenOwnership) internal _ownerships;

        // Mapping owner address to address data
        mapping(address => AddressData) private _addressData;

        // 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;

        constructor(string memory name_, string memory symbol_) {
            _name = name_;
            _symbol = symbol_;
            _currentIndex = _startTokenId();
        }

        /**
        * To change the starting tokenId, please override this function.
        */
        function _startTokenId() internal view virtual returns (uint256) {
            return 0;
        }

        /**
        * @dev Burned tokens are calculated here, use _totalMinted() if you want to count just minted tokens.
        */
        function totalSupply() public view returns (uint256) {
            // Counter underflow is impossible as _burnCounter cannot be incremented
            // more than _currentIndex - _startTokenId() times
            unchecked {
                return _currentIndex - _burnCounter - _startTokenId();
            }
        }

        /**
        * Returns the total amount of tokens minted in the contract.
        */
        function _totalMinted() internal view returns (uint256) {
            // Counter underflow is impossible as _currentIndex does not decrement,
            // and it is initialized to _startTokenId()
            unchecked {
                return _currentIndex - _startTokenId();
            }
        }

        /**
        * @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 override returns (uint256) {
            if (owner == address(0)) revert BalanceQueryForZeroAddress();
            return uint256(_addressData[owner].balance);
        }

        /**
        * Returns the number of tokens minted by `owner`.
        */
        function _numberMinted(address owner) internal view returns (uint256) {
            return uint256(_addressData[owner].numberMinted);
        }

        /**
        * Returns the number of tokens burned by or on behalf of `owner`.
        */
        function _numberBurned(address owner) internal view returns (uint256) {
            return uint256(_addressData[owner].numberBurned);
        }

        /**
        * Returns the auxillary data for `owner`. (e.g. number of whitelist mint slots used).
        */
        function _getAux(address owner) internal view returns (uint64) {
            return _addressData[owner].aux;
        }

        /**
        * Sets the auxillary data for `owner`. (e.g. number of whitelist mint slots used).
        * If there are multiple variables, please pack them into a uint64.
        */
        function _setAux(address owner, uint64 aux) internal {
            _addressData[owner].aux = aux;
        }

        /**
        * Gas spent here starts off proportional to the maximum mint batch size.
        * It gradually moves to O(1) as tokens get transferred around in the collection over time.
        */
        function _ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {
            uint256 curr = tokenId;

            unchecked {
                if (_startTokenId() <= curr && curr < _currentIndex) {
                    TokenOwnership memory ownership = _ownerships[curr];
                    if (!ownership.burned) {
                        if (ownership.addr != address(0)) {
                            return ownership;
                        }
                        // Invariant:
                        // There will always be an ownership that has an address and is not burned
                        // before an ownership that does not have an address and is not burned.
                        // Hence, curr will not underflow.
                        while (true) {
                            curr--;
                            ownership = _ownerships[curr];
                            if (ownership.addr != address(0)) {
                                return ownership;
                            }
                        }
                    }
                }
            }
            revert OwnerQueryForNonexistentToken();
        }

        /**
        * @dev See {IERC721-ownerOf}.
        */
        function ownerOf(uint256 tokenId) public view override returns (address) {
            return _ownershipOf(tokenId).addr;
        }

        /**
        * @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) {
            if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

            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 override {
            address owner = ERC721A.ownerOf(tokenId);
            if (to == owner) revert ApprovalToCurrentOwner();

            if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {
                revert ApprovalCallerNotOwnerNorApproved();
            }

            _approve(to, tokenId, owner);
        }

        /**
        * @dev See {IERC721-getApproved}.
        */
        function getApproved(uint256 tokenId) public view override returns (address) {
            if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

            return _tokenApprovals[tokenId];
        }

        /**
        * @dev See {IERC721-setApprovalForAll}.
        */
        function setApprovalForAll(address operator, bool approved) public virtual override {
            if (operator == _msgSender()) revert ApproveToCaller();

            _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 {
            _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 {
            _transfer(from, to, tokenId);
            if (to.isContract() && !_checkContractOnERC721Received(from, to, tokenId, _data)) {
                revert TransferToNonERC721ReceiverImplementer();
            }
        }

        /**
        * @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`),
        */
        function _exists(uint256 tokenId) internal view returns (bool) {
            return _startTokenId() <= tokenId && tokenId < _currentIndex &&
                !_ownerships[tokenId].burned;
        }

        function _safeMint(address to, uint256 quantity) internal {
            _safeMint(to, quantity, '');
        }

        /**
        * @dev Safely mints `quantity` tokens and transfers them to `to`.
        *
        * Requirements:
        *
        * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
        * - `quantity` must be greater than 0.
        *
        * Emits a {Transfer} event.
        */
        function _safeMint(
            address to,
            uint256 quantity,
            bytes memory _data
        ) internal {
            _mint(to, quantity, _data, true);
        }

        /**
        * @dev Mints `quantity` tokens and transfers them to `to`.
        *
        * Requirements:
        *
        * - `to` cannot be the zero address.
        * - `quantity` must be greater than 0.
        *
        * Emits a {Transfer} event.
        */
        function _mint(
            address to,
            uint256 quantity,
            bytes memory _data,
            bool safe
        ) internal {
            uint256 startTokenId = _currentIndex;
            if (to == address(0)) revert MintToZeroAddress();
            if (quantity == 0) revert MintZeroQuantity();

            _beforeTokenTransfers(address(0), to, startTokenId, quantity);

            // Overflows are incredibly unrealistic.
            // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1
            // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1
            unchecked {
                _addressData[to].balance += uint64(quantity);
                _addressData[to].numberMinted += uint64(quantity);

                _ownerships[startTokenId].addr = to;
                _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);

                uint256 updatedIndex = startTokenId;
                uint256 end = updatedIndex + quantity;

                if (safe && to.isContract()) {
                    do {
                        emit Transfer(address(0), to, updatedIndex);
                        if (!_checkContractOnERC721Received(address(0), to, updatedIndex++, _data)) {
                            revert TransferToNonERC721ReceiverImplementer();
                        }
                    } while (updatedIndex != end);
                    // Reentrancy protection
                    if (_currentIndex != startTokenId) revert();
                } else {
                    do {
                        emit Transfer(address(0), to, updatedIndex++);
                    } while (updatedIndex != end);
                }
                _currentIndex = updatedIndex;
            }
            _afterTokenTransfers(address(0), to, startTokenId, quantity);
        }

        /**
        * @dev Transfers `tokenId` from `from` to `to`.
        *
        * 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
        ) private {
            TokenOwnership memory prevOwnership = _ownershipOf(tokenId);

            if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();

            bool isApprovedOrOwner = (_msgSender() == from ||
                isApprovedForAll(from, _msgSender()) ||
                getApproved(tokenId) == _msgSender());

            if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
            if (to == address(0)) revert TransferToZeroAddress();

            _beforeTokenTransfers(from, to, tokenId, 1);

            // Clear approvals from the previous owner
            _approve(address(0), tokenId, from);

            // Underflow of the sender's balance is impossible because we check for
            // ownership above and the recipient's balance can't realistically overflow.
            // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.
            unchecked {
                _addressData[from].balance -= 1;
                _addressData[to].balance += 1;

                TokenOwnership storage currSlot = _ownerships[tokenId];
                currSlot.addr = to;
                currSlot.startTimestamp = uint64(block.timestamp);

                // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.
                // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
                uint256 nextTokenId = tokenId + 1;
                TokenOwnership storage nextSlot = _ownerships[nextTokenId];
                if (nextSlot.addr == address(0)) {
                    // This will suffice for checking _exists(nextTokenId),
                    // as a burned slot cannot contain the zero address.
                    if (nextTokenId != _currentIndex) {
                        nextSlot.addr = from;
                        nextSlot.startTimestamp = prevOwnership.startTimestamp;
                    }
                }
            }

            emit Transfer(from, to, tokenId);
            _afterTokenTransfers(from, to, tokenId, 1);
        }

        /**
        * @dev This is equivalent to _burn(tokenId, false)
        */
        function _burn(uint256 tokenId) internal virtual {
            _burn(tokenId, false);
        }

        /**
        * @dev Destroys `tokenId`.
        * The approval is cleared when the token is burned.
        *
        * Requirements:
        *
        * - `tokenId` must exist.
        *
        * Emits a {Transfer} event.
        */
        function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
            TokenOwnership memory prevOwnership = _ownershipOf(tokenId);

            address from = prevOwnership.addr;

            if (approvalCheck) {
                bool isApprovedOrOwner = (_msgSender() == from ||
                    isApprovedForAll(from, _msgSender()) ||
                    getApproved(tokenId) == _msgSender());

                if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
            }

            _beforeTokenTransfers(from, address(0), tokenId, 1);

            // Clear approvals from the previous owner
            _approve(address(0), tokenId, from);

            // Underflow of the sender's balance is impossible because we check for
            // ownership above and the recipient's balance can't realistically overflow.
            // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.
            unchecked {
                AddressData storage addressData = _addressData[from];
                addressData.balance -= 1;
                addressData.numberBurned += 1;

                // Keep track of who burned the token, and the timestamp of burning.
                TokenOwnership storage currSlot = _ownerships[tokenId];
                currSlot.addr = from;
                currSlot.startTimestamp = uint64(block.timestamp);
                currSlot.burned = true;

                // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.
                // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
                uint256 nextTokenId = tokenId + 1;
                TokenOwnership storage nextSlot = _ownerships[nextTokenId];
                if (nextSlot.addr == address(0)) {
                    // This will suffice for checking _exists(nextTokenId),
                    // as a burned slot cannot contain the zero address.
                    if (nextTokenId != _currentIndex) {
                        nextSlot.addr = from;
                        nextSlot.startTimestamp = prevOwnership.startTimestamp;
                    }
                }
            }

            emit Transfer(from, address(0), tokenId);
            _afterTokenTransfers(from, address(0), tokenId, 1);

            // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
            unchecked {
                _burnCounter++;
            }
        }

        /**
        * @dev Approve `to` to operate on `tokenId`
        *
        * Emits a {Approval} event.
        */
        function _approve(
            address to,
            uint256 tokenId,
            address owner
        ) private {
            _tokenApprovals[tokenId] = to;
            emit Approval(owner, to, tokenId);
        }

        /**
        * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target 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 _checkContractOnERC721Received(
            address from,
            address to,
            uint256 tokenId,
            bytes memory _data
        ) private returns (bool) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert TransferToNonERC721ReceiverImplementer();
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        }

        /**
        * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.
        * And also called before burning one token.
        *
        * startTokenId - the first token id to be transferred
        * quantity - the amount to be transferred
        *
        * 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, `tokenId` will be burned by `from`.
        * - `from` and `to` are never both zero.
        */
        function _beforeTokenTransfers(
            address from,
            address to,
            uint256 startTokenId,
            uint256 quantity
        ) internal virtual {}

        /**
        * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes
        * minting.
        * And also called after one token has been burned.
        *
        * startTokenId - the first token id to be transferred
        * quantity - the amount to be transferred
        *
        * Calling conditions:
        *
        * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
        * transferred to `to`.
        * - When `from` is zero, `tokenId` has been minted for `to`.
        * - When `to` is zero, `tokenId` has been burned by `from`.
        * - `from` and `to` are never both zero.
        */
        function _afterTokenTransfers(
            address from,
            address to,
            uint256 startTokenId,
            uint256 quantity
        ) internal virtual {}
    }
    pragma solidity ^0.8.0;

   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);
        }
    }



        // *******************************************//
        // Addled NFT Contract is ERC-721A Contract
        /*Developer Info:
        Written by Meraj Bugti Blockchain Developer @ www.themetaconcepts.com
        Email: iintadeveloper@gmail.com */

        pragma solidity ^0.8.7;
                
        contract AddledCroc is ERC721A, Ownable {
        using Strings for uint256;

            //max supply is set to 10000
            uint16 public constant maxSupply = 10000;
            // uriPrefix is the BaseUri
            string private uriPrefix ;
            string private uriSuffix = ".json";
            string public hiddenURL ;
            //cost for Pulic Mint and Presale Mint
            uint256 public publicSaleCost = 0.08 ether;
            uint256 public preSaleCost = 0.05 ether;
            // Max MintAmount per Tx for Public sale
            uint8 public maxMintAmountPerTxInPublicSale = 10;
            // Max MintAmount Per tx for Pre-sale
            uint8 public maxMintAmountPerTxPresale = 3;

            // Pre-sale is active and Public sale is Paused                                                        
            bool public publicSalePaused = true;
            bool public preSalePaused = false;

            //Collection is set revlead 
            bool public reveal =true;
            uint16 counter;

            // Name & Symbol of Project in Constructor 

            constructor() ERC721A("Addled Crocodiles", "AddledCroc") {}

            // Function Pre-sale mint, Presale Limit is 4000
            //Contract will pause once 4000 tokens are minted

            function presaleMint(uint16 _mintAmount) external payable  { 
                uint16 totalSupply = uint16(totalSupply());
                require(totalSupply + _mintAmount <= maxSupply, "Excedes maximum mint Allowed Per tx supply.");
                require(_mintAmount <= maxMintAmountPerTxPresale, "Exceeds max Allowed per transaction.");

                require(!preSalePaused, "The contract is paused!");
                require(msg.value == preSaleCost * _mintAmount, "Insufficient funds!");

                _safeMint(msg.sender , _mintAmount);
                counter = counter + _mintAmount ;
                // preSale  will be automatically paused after 4000 NFTs are minted in this phase
                if ( counter >= 4000)
                {
                preSalePaused = true;
                counter = 0;
                }
                delete totalSupply;
                delete _mintAmount;
                }  
            
            // Function for Public Mint 
            function publicMint(uint16 _mintAmount) external payable  {
                uint16 totalSupply = uint16(totalSupply());
                require(totalSupply + _mintAmount <= maxSupply, "Excedes max supply.");
                require(_mintAmount <= maxMintAmountPerTxInPublicSale, "Exceeds Allowed mint Amount per transaction.");
                require(!publicSalePaused, "The contract is paused!");
                require(msg.value == publicSaleCost * _mintAmount, "Insufficient funds!");

                _safeMint(msg.sender , _mintAmount);
                
                delete totalSupply;
                delete _mintAmount;
                }
            
             // Function can be used to reserve Tokens
            function Reserve(uint16 _mintAmount, address _receiver) external onlyOwner {
                uint16 totalSupply = uint16(totalSupply());
                require(totalSupply + _mintAmount <= maxSupply, "Excedes max supply.");
                _safeMint(_receiver , _mintAmount);
                delete _mintAmount;
                delete _receiver;
                delete totalSupply;
            }
           
           // Function Airdrop
            function Airdrop(uint16 _mintAmount, address _receiver) external onlyOwner {
                uint16 totalSupply = uint16(totalSupply());
                require(totalSupply + _mintAmount <= maxSupply, "Excedes max supply.");
                _safeMint(_receiver , _mintAmount);
                delete _mintAmount;
                delete _receiver;
                delete totalSupply;
                }

            // Function Burn Tokens
            function burn(uint _tokenID) external onlyOwner {
                _burn(_tokenID);
            }
            
            function tokenURI(uint256 _tokenId) public view virtual override returns (string memory) { 
            require(_exists(_tokenId),"ERC721Metadata: URI query for nonexistent token");
            if ( reveal == false){
                return hiddenURL;
            }
                
            string memory currentBaseURI = _baseURI();
                return bytes(currentBaseURI).length > 0
                    ? string(abi.encodePacked(currentBaseURI, _tokenId.toString() ,uriSuffix))
                    : "";
            }
            
            function setPreSalePaused() external onlyOwner {
                preSalePaused = !preSalePaused;
                counter = 0;
            }

            function setPublicSalePaused() external onlyOwner {
                publicSalePaused= !publicSalePaused;
                preSalePaused = true;
                counter = 0;
            }
            
            function setPresaleCost(uint256 _cost) external onlyOwner {
                preSaleCost = _cost;
                delete _cost;
            }

            function setPublicSaleCost(uint256 _cost) external onlyOwner {
                publicSaleCost = _cost;
                delete _cost;
            }

            function setMaxMintPerTxPresale(uint8 _limit) external onlyOwner{
                maxMintAmountPerTxPresale = _limit;
            delete _limit;
            }

            function setMaxMintPerTxInPublicSale(uint8 _limit) external onlyOwner{
                maxMintAmountPerTxInPublicSale = _limit;
            delete _limit;
            }
        
            function setBaseURI(string memory _uriPrefix) external onlyOwner {
                uriPrefix = _uriPrefix;
            }
            function setHiddenUri(string memory _uriPrefix) external onlyOwner {
                hiddenURL = _uriPrefix;
            }

            function _baseURI() internal view  override returns (string memory) {
                return uriPrefix;
            }

            function setRevealed() external onlyOwner{
                reveal = !reveal;
            }

            function withdraw() external onlyOwner {
            uint _balance = address(this).balance;
                payable(msg.sender).transfer(_balance ); 
            }

        }