// 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/Address.sol


// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @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);
            }
        }
    }
}

// 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/IERC721Enumerable.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;


/**
 * @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);
}

// 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: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: @openzeppelin/contracts/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: contracts/ERC721A.sol





pragma solidity ^0.8.0;











/**

 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including

 * the Metadata and Enumerable extension. Built to optimize for lower gas during batch mints.

 *

 * Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).

 *

 * Assumes the number of issuable tokens (collection size) is capped and fits in a uint128.

 *

 * Does not support burning tokens to address(0).

 */

contract ERC721A is

  Context,

  ERC165,

  IERC721,

  IERC721Metadata,

  IERC721Enumerable

{

  using Address for address;

  using Strings for uint256;



  struct TokenOwnership {

    address addr;

    uint64 startTimestamp;

  }



  struct AddressData {

    uint128 balance;

    uint128 numberMinted;

  }



  uint256 private currentIndex = 0;



  uint256 internal immutable collectionSize;

  uint256 internal immutable maxBatchSize;



  // 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) private _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;



  /**

   * @dev

   * `maxBatchSize` refers to how much a minter can mint at a time.

   * `collectionSize_` refers to how many tokens are in the collection.

   */

  constructor(

    string memory name_,

    string memory symbol_,

    uint256 maxBatchSize_,

    uint256 collectionSize_

  ) {

    require(

      collectionSize_ > 0,

      "ERC721A: collection must have a nonzero supply"

    );

    require(maxBatchSize_ > 0, "ERC721A: max batch size must be nonzero");

    _name = name_;

    _symbol = symbol_;

    maxBatchSize = maxBatchSize_;

    collectionSize = collectionSize_;

  }



  /**

   * @dev See {IERC721Enumerable-totalSupply}.

   */

  function totalSupply() public view override returns (uint256) {

    return currentIndex;

  }



  /**

   * @dev See {IERC721Enumerable-tokenByIndex}.

   */

  function tokenByIndex(uint256 index) public view override returns (uint256) {

    require(index < totalSupply(), "ERC721A: global index out of bounds");

    return index;

  }



  /**

   * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.

   * This read function is O(collectionSize). If calling from a separate contract, be sure to test gas first.

   * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.

   */

  function tokenOfOwnerByIndex(address owner, uint256 index)

    public

    view

    override

    returns (uint256)

  {

    require(index < balanceOf(owner), "ERC721A: owner index out of bounds");

    uint256 numMintedSoFar = totalSupply();

    uint256 tokenIdsIdx = 0;

    address currOwnershipAddr = address(0);

    for (uint256 i = 0; i < numMintedSoFar; i++) {

      TokenOwnership memory ownership = _ownerships[i];

      if (ownership.addr != address(0)) {

        currOwnershipAddr = ownership.addr;

      }

      if (currOwnershipAddr == owner) {

        if (tokenIdsIdx == index) {

          return i;

        }

        tokenIdsIdx++;

      }

    }

    revert("ERC721A: unable to get token of owner by index");

  }



  /**

   * @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 ||

      interfaceId == type(IERC721Enumerable).interfaceId ||

      super.supportsInterface(interfaceId);

  }



  /**

   * @dev See {IERC721-balanceOf}.

   */

  function balanceOf(address owner) public view override returns (uint256) {

    require(owner != address(0), "ERC721A: balance query for the zero address");

    return uint256(_addressData[owner].balance);

  }



  function _numberMinted(address owner) internal view returns (uint256) {

    require(

      owner != address(0),

      "ERC721A: number minted query for the zero address"

    );

    return uint256(_addressData[owner].numberMinted);

  }



  function ownershipOf(uint256 tokenId)

    internal

    view

    returns (TokenOwnership memory)

  {

    require(_exists(tokenId), "ERC721A: owner query for nonexistent token");



    uint256 lowestTokenToCheck;

    if (tokenId >= maxBatchSize) {

      lowestTokenToCheck = tokenId - maxBatchSize + 1;

    }



    for (uint256 curr = tokenId; curr >= lowestTokenToCheck; curr--) {

      TokenOwnership memory ownership = _ownerships[curr];

      if (ownership.addr != address(0)) {

        return ownership;

      }

    }



    revert("ERC721A: unable to determine the owner of token");

  }



  /**

   * @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)

  {

    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 override {

    address owner = ERC721A.ownerOf(tokenId);

    require(to != owner, "ERC721A: approval to current owner");



    require(

      _msgSender() == owner || isApprovedForAll(owner, _msgSender()),

      "ERC721A: approve caller is not owner nor approved for all"

    );



    _approve(to, tokenId, owner);

  }



  /**

   * @dev See {IERC721-getApproved}.

   */

  function getApproved(uint256 tokenId) public view override returns (address) {

    require(_exists(tokenId), "ERC721A: approved query for nonexistent token");



    return _tokenApprovals[tokenId];

  }



  /**

   * @dev See {IERC721-setApprovalForAll}.

   */

  function setApprovalForAll(address operator, bool approved) public override {

    require(operator != _msgSender(), "ERC721A: 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 override {

    _transfer(from, to, tokenId);

  }



  /**

   * @dev See {IERC721-safeTransferFrom}.

   */

  function safeTransferFrom(

    address from,

    address to,

    uint256 tokenId

  ) public override {

    safeTransferFrom(from, to, tokenId, "");

  }



  /**

   * @dev See {IERC721-safeTransferFrom}.

   */

  function safeTransferFrom(

    address from,

    address to,

    uint256 tokenId,

    bytes memory _data

  ) public override {

    _transfer(from, to, tokenId);

    require(

      _checkOnERC721Received(from, to, tokenId, _data),

      "ERC721A: 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`),

   */

  function _exists(uint256 tokenId) internal view returns (bool) {

    return tokenId < currentIndex;

  }



  function _safeMint(address to, uint256 quantity) internal {

    _safeMint(to, quantity, "");

  }



  /**

   * @dev Mints `quantity` tokens and transfers them to `to`.

   *

   * Requirements:

   *

   * - there must be `quantity` tokens remaining unminted in the total collection.

   * - `to` cannot be the zero address.

   * - `quantity` cannot be larger than the max batch size.

   *

   * Emits a {Transfer} event.

   */

  function _safeMint(

    address to,

    uint256 quantity,

    bytes memory _data

  ) internal {

    uint256 startTokenId = currentIndex;

    require(to != address(0), "ERC721A: mint to the zero address");

    // We know if the first token in the batch doesn't exist, the other ones don't as well, because of serial ordering.

    require(!_exists(startTokenId), "ERC721A: token already minted");

    require(quantity <= maxBatchSize, "ERC721A: quantity to mint too high");



    _beforeTokenTransfers(address(0), to, startTokenId, quantity);



    AddressData memory addressData = _addressData[to];

    _addressData[to] = AddressData(

      addressData.balance + uint128(quantity),

      addressData.numberMinted + uint128(quantity)

    );

    _ownerships[startTokenId] = TokenOwnership(to, uint64(block.timestamp));



    uint256 updatedIndex = startTokenId;



    for (uint256 i = 0; i < quantity; i++) {

      emit Transfer(address(0), to, updatedIndex);

      require(

        _checkOnERC721Received(address(0), to, updatedIndex, _data),

        "ERC721A: transfer to non ERC721Receiver implementer"

      );

      updatedIndex++;

    }



    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);



    bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||

      getApproved(tokenId) == _msgSender() ||

      isApprovedForAll(prevOwnership.addr, _msgSender()));



    require(

      isApprovedOrOwner,

      "ERC721A: transfer caller is not owner nor approved"

    );



    require(

      prevOwnership.addr == from,

      "ERC721A: transfer from incorrect owner"

    );

    require(to != address(0), "ERC721A: transfer to the zero address");



    _beforeTokenTransfers(from, to, tokenId, 1);



    // Clear approvals from the previous owner

    _approve(address(0), tokenId, prevOwnership.addr);



    _addressData[from].balance -= 1;

    _addressData[to].balance += 1;

    _ownerships[tokenId] = TokenOwnership(to, 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;

    if (_ownerships[nextTokenId].addr == address(0)) {

      if (_exists(nextTokenId)) {

        _ownerships[nextTokenId] = TokenOwnership(

          prevOwnership.addr,

          prevOwnership.startTimestamp

        );

      }

    }



    emit Transfer(from, to, tokenId);

    _afterTokenTransfers(from, to, tokenId, 1);

  }



  /**

   * @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);

  }



  uint256 public nextOwnerToExplicitlySet = 0;



  /**

   * @dev Explicitly set `owners` to eliminate loops in future calls of ownerOf().

   */

  function _setOwnersExplicit(uint256 quantity) internal {

    uint256 oldNextOwnerToSet = nextOwnerToExplicitlySet;

    require(quantity > 0, "quantity must be nonzero");

    uint256 endIndex = oldNextOwnerToSet + quantity - 1;

    if (endIndex > collectionSize - 1) {

      endIndex = collectionSize - 1;

    }

    // We know if the last one in the group exists, all in the group exist, due to serial ordering.

    require(_exists(endIndex), "not enough minted yet for this cleanup");

    for (uint256 i = oldNextOwnerToSet; i <= endIndex; i++) {

      if (_ownerships[i].addr == address(0)) {

        TokenOwnership memory ownership = ownershipOf(i);

        _ownerships[i] = TokenOwnership(

          ownership.addr,

          ownership.startTimestamp

        );

      }

    }

    nextOwnerToExplicitlySet = endIndex + 1;

  }



  /**

   * @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(to).onERC721Received.selector;

      } catch (bytes memory reason) {

        if (reason.length == 0) {

          revert("ERC721A: transfer to non ERC721Receiver implementer");

        } else {

          assembly {

            revert(add(32, reason), mload(reason))

          }

        }

      }

    } else {

      return true;

    }

  }



  /**

   * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.

   *

   * 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`.

   */

  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.

   *

   * 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` and `to` are never both zero.

   */

  function _afterTokenTransfers(

    address from,

    address to,

    uint256 startTokenId,

    uint256 quantity

  ) internal virtual {}

}
// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: contracts/AdofoYTestnet.sol





/*

 █████╗ ██████╗  ██████╗ ███████╗ ██████╗      ██╗   ██╗    
██╔══██╗██╔══██╗██╔═══██╗██╔════╝██╔═══██╗     ╚██╗ ██╔╝    
███████║██║  ██║██║   ██║█████╗  ██║   ██║█████╗╚████╔╝     
██╔══██║██║  ██║██║   ██║██╔══╝  ██║   ██║╚════╝ ╚██╔╝      
██║  ██║██████╔╝╚██████╔╝██║     ╚██████╔╝        ██║       
╚═╝  ╚═╝╚═════╝  ╚═════╝ ╚═╝      ╚═════╝         ╚═╝       

                                        Developer: BR33D
                                        Artist: JC-X     */



pragma solidity ^0.8.0;







interface MintPass {

    function balanceOf(address owner) external view returns (uint256);

}



contract AdofoY is Ownable, ERC721A, ReentrancyGuard {

  uint256 public immutable maxPerAddressDuringMint;

  uint256 public immutable maxPerWhitelistMint;

  uint256 public immutable amountForDevs;

  uint256 public maxPerTxPublic;

  address public mintPassedContract = 0xF92cF4a3776bA3F6a3eD96E1974D38Fcf59307f6;

  address[] public whitelistedAddresses;

  address payable public payments;

  bool public hasDevMinted;

  address private authority;

  uint private key;



  struct SaleConfig {

    uint32 holdersSaleStartTime;

    uint32 whitelistSaleStartTime;

    uint32 publicSaleStartTime;

    uint64 adofoXMintPrice;

    uint64 publicPrice;

  }



  SaleConfig public saleConfig;



  mapping(address => bool) public whitelistMinted;

  mapping(address => bool) public adofoXHolderMinted;

  mapping(address => bool) public mintPassHolders;



  constructor(

    uint256 maxBatchSize_,

    uint256 maxWhitelistBatch_,

    uint256 collectionSize_,

    uint256 amountForDevs_,

    uint256 txMaxPer_,

    address payments_,

    bool devMint_

  ) ERC721A("Adofo-Y", "ADOFO-Y", maxBatchSize_, collectionSize_) {

    payments = payable(payments_);

    maxPerAddressDuringMint = maxBatchSize_;

    amountForDevs = amountForDevs_;

    maxPerWhitelistMint = maxWhitelistBatch_;

    maxPerTxPublic = txMaxPer_;

    hasDevMinted = devMint_;

  }



  modifier callerIsUser() {

    require(tx.origin == msg.sender, "The caller is another contract");

    _;

  }



  /*

    |----------------------------|

    |------ Mint Functions ------|

    |----------------------------|

  */



    // adofo-x holders mint

  function adofoXHoldersMint(uint256 numOfAdofos) external payable callerIsUser {

    uint256 price = uint256(saleConfig.adofoXMintPrice);

    uint256 saleStart = uint256(saleConfig.holdersSaleStartTime);

    require(

      block.timestamp >= saleStart && 

      saleStart > 0, "holders sale has not begun yet");

    require(isWhitelisted(msg.sender), "user is not whitelisted");

    require(price != 0, "X holder sale has not begun yet");

    require(adofoXHolderMinted[msg.sender] == false, "not eligible for X holder mint");

    require(totalSupply() + numOfAdofos <= collectionSize, "reached max supply");

    require(numOfAdofos <= maxPerWhitelistMint, "exceeds mint allowance");

    adofoXHolderMinted[msg.sender] = true;

    _safeMint(msg.sender, numOfAdofos);

    refundIfOver(price);

  }

    // whitelist mint

  function whiteListMint(bytes32 _hash, uint256 numOfAdofos) external payable callerIsUser {

    uint256 price = uint256(saleConfig.publicPrice);

    uint256 saleStart = uint256(saleConfig.whitelistSaleStartTime);

    require(

      block.timestamp >= saleStart && 

      saleStart > 0, "whitelist sale has not begun yet");

    require(totalSupply() + numOfAdofos <= collectionSize, "reached max supply");

    require(numOfAdofos <= maxPerWhitelistMint, "exceeds mint allowance");

    require(_hash == checkHash(msg.sender), "Not a true warrior");

    require(whitelistMinted[msg.sender] == false, "Already minted");

    whitelistMinted[msg.sender] = true;

    _safeMint(msg.sender, numOfAdofos);

    refundIfOver(price);

  }

    // NFT holders mint

  function tokenHoldersMint(uint256 numOfAdofos) external payable callerIsUser {

    uint256 price = uint256(saleConfig.adofoXMintPrice);

    uint256 saleStart = uint256(saleConfig.holdersSaleStartTime);

    require(

      block.timestamp >= saleStart && 

      saleStart > 0, "holders sale has not begun yet");

    bool minted = mintPassHolders[msg.sender];

    require(hasMintPass(msg.sender) == true, "must hold a mint pass");

    require(totalSupply() + numOfAdofos <= collectionSize, "reached max supply");

    require(numOfAdofos <= maxPerWhitelistMint, "exceeds mint allowance");

    require(minted == false, "already minted");



    mintPassHolders[msg.sender] = true;

    _safeMint(msg.sender, numOfAdofos);

    refundIfOver(price);

  }

    // public sale

  function publicSaleMint(uint256 quantity)

    external

    payable

    callerIsUser

  {

    SaleConfig memory config = saleConfig;

    uint256 publicPrice = uint256(config.publicPrice);

    uint256 publicSaleStartTime = uint256(config.publicSaleStartTime);

    require(isPublicSaleOn(publicPrice, publicSaleStartTime), "public sale has not begun yet");

    require(totalSupply() + quantity <= collectionSize, "reached max supply");

    require(numberMinted(msg.sender) + quantity <= maxPerAddressDuringMint, "can not mint this many");

    require(quantity <= maxPerTxPublic, "too many per tx");

    _safeMint(msg.sender, quantity);

    refundIfOver(publicPrice * quantity);

  }



  /*

    |----------------------------|

    |---- Contract Functions ----|

    |----------------------------|

  */



    // returns any extra funds sent by user, protects user from over paying

  function refundIfOver(uint256 price) private {

    require(msg.value >= price, "Need to send more ETH.");

    if (msg.value > price) {

      payable(msg.sender).transfer(msg.value - price);

    }

  }



  /*

    |----------------------------|

    |------ View Functions ------|

    |----------------------------|

  */



    // check if public sale has started

  function isPublicSaleOn(

    uint256 publicPriceWei,

    uint256 publicSaleStartTime

  ) public view returns (bool) {

    return

      publicPriceWei != 0 &&

      block.timestamp >= publicSaleStartTime;

  }



    //Retrieves token ids owned of address provided

    function walletOfOwner(address _owner) public view returns (uint256[] memory) {

        uint256 ownerTokenCount = balanceOf(_owner);

        uint256[] memory tokenIds = new uint256[](ownerTokenCount);

        for (uint256 i; i < ownerTokenCount; i++) {

            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);

            

        }

        return tokenIds;

    }



  // check if an address is whitelisted

  function isWhitelisted(address _user) public view returns (bool) {

    for (uint i = 0; i < whitelistedAddresses.length; i++) {

      if (whitelistedAddresses[i] == _user) {

          return true;

      }

    }

    return false;

  }

    // check if holder has mint passed NFT

  function hasMintPass(address _user) public view returns (bool) {

		uint pass = MintPass(mintPassedContract).balanceOf(_user);

		

		if (pass >= 1){

			return true;

		}

		return false;

	}

    function checkHash(address _minter) internal view returns (bytes32) {

        bytes32 correctHash = bytes32(keccak256(abi.encodePacked(_minter, key, authority)));

        return correctHash;

    }



  function numberMinted(address owner) public view returns (uint256) {

    return _numberMinted(owner);

  }



  function getOwnershipData(uint256 tokenId)

    external

    view

    returns (TokenOwnership memory)

  {

    return ownershipOf(tokenId);

  }



  // metadata URI

  string private _baseTokenURI;



  function _baseURI() internal view virtual override returns (string memory) {

    return _baseTokenURI;

  }



  /*

    |----------------------------|

    |----- Owner  Functions -----|

    |----------------------------|

  */



    // setup minting info

  function setupSaleInfo(

    uint64 adofoXMintPriceWei,

    uint64 publicPriceWei,

    uint32 holdersSaleStartTime,

    uint32 whitelistSaleStartTime,

    uint32 publicSaleStartTime

  ) external onlyOwner {

    saleConfig = SaleConfig(

      holdersSaleStartTime,

      whitelistSaleStartTime,

      publicSaleStartTime,

      adofoXMintPriceWei,

      publicPriceWei

    );

  }



  // create list of adofo-x holders addresses

  function whitelistUsers(address[] calldata _users) public onlyOwner {

    delete whitelistedAddresses;

    whitelistedAddresses = _users;

  }



  // for OG holders/promotions/giveaways

  function devMint() external onlyOwner {

    require(

      totalSupply() + amountForDevs <= collectionSize,

      "too many already minted before dev mint"

    );

    require(

      hasDevMinted == false, "dev has already claimed"

    );

      _safeMint(msg.sender, amountForDevs);

      hasDevMinted = true;

  }



  function setBaseURI(string calldata baseURI) external onlyOwner {

    _baseTokenURI = baseURI;

  }



  function setMintPassContract(address _contract) public onlyOwner {

		mintPassedContract = _contract;

	}



  function withdraw() external onlyOwner nonReentrant {

    (bool success, ) = payable(payments).call{value: address(this).balance}("");

    require(success);

  }

  function setKey(uint _key) external onlyOwner{

    key = _key;

    }



    function setAuthority(address _address) external onlyOwner{

        authority = _address;

    }



  function setOwnersExplicit(uint256 quantity) external onlyOwner nonReentrant {

    _setOwnersExplicit(quantity);

  }

}