// File: contracts/ERC721B2FA_REMNANTS.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

/*
 8888888b.  8888888888 888b     d888 888b    888        d8888 888b    888 88888888888 .d8888b.  
 888   Y88b 888        8888b   d8888 8888b   888       d88888 8888b   888     888    d88P  Y88b 
 888    888 888        88888b.d88888 88888b  888      d88P888 88888b  888     888    Y88b.      
 888   d88P 8888888    888Y88888P888 888Y88b 888     d88P 888 888Y88b 888     888     "Y888b.   
 8888888P"  888        888 Y888P 888 888 Y88b888    d88P  888 888 Y88b888     888        "Y88b. 
 888 T88b   888        888  Y8P  888 888  Y88888   d88P   888 888  Y88888     888          "888 
 888  T88b  888        888   "   888 888   Y8888  d8888888888 888   Y8888     888    Y88b  d88P 
 888   T88b 8888888888 888       888 888    Y888 d88P     888 888    Y888     888     "Y8888P"                                                                                                                                                                                                                                                                                            
 
 *************************************************************************
 * @title: Remnants                                       *
 * @author: @ghooost0x2a                                                 *
 * ERC721B2FA - Ultra Low Gas - 2 Factor Authentication                  *
 *************************************************************************
 * ERC721B2FA is based on ERC721B low gas contract by @squuebo_nft       *
 * and the LockRegistry/Guardian contracts by @OwlOfMoistness            *
 *************************************************************************
 *     :::::::              ::::::::      :::                            *
 *    :+:   :+: :+:    :+: :+:    :+:   :+: :+:                          *
 *    +:+  :+:+  +:+  +:+        +:+   +:+   +:+                         *
 *    +#+ + +:+   +#++:+       +#+    +#++:++#++:                        *
 *    +#+#  +#+  +#+  +#+    +#+      +#+     +#+                        *
 *    #+#   #+# #+#    #+#  #+#       #+#     #+#                        *
 *     #######             ########## ###     ###                        *
 *************************************************************************/

import "./ERC721B2FAEnumLite.sol";
import "./GuardianLiteB2FA.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

contract ERC721B2FA_REMNANTS is ERC721B2FAEnumLite, GuardianLiteB2FA {
    using Address for address;
    using Strings for uint256;

    event Withdrawn(address indexed payee, uint256 weiAmount);

    uint256 public MAX_SUPPLY = 42;
    string internal baseURI = "";
    string internal uriSuffix = ".json";
    string internal commonURI = "";

    address private withdrawalAddy;

    constructor() ERC721B2FAEnumLite("REMNANTS", "REM", 1) {}

    fallback() external payable {
        revert("Fallback FN!");
    }

    receive() external payable {}

    //getter fns
    function getWithdrawalAddy() external view onlyDelegates returns (address) {
        return withdrawalAddy;
    }

    function tokenURI(uint256 tokenId)
        external
        view
        override
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );

        if (bytes(commonURI).length > 0) {
            return string(abi.encodePacked(commonURI));
        }

        return
            bytes(baseURI).length > 0
                ? string(
                    abi.encodePacked(baseURI, tokenId.toString(), uriSuffix)
                )
                : "";
    }

    //setter fns
    function setCommonURI(string calldata newCommonURI) external onlyDelegates {
        //dev: Set to "" to disable commonURI
        commonURI = newCommonURI;
    }

    function setBaseSuffixURI(
        string calldata newBaseURI,
        string calldata newURISuffix
    ) external onlyDelegates {
        baseURI = newBaseURI;
        uriSuffix = newURISuffix;
    }

    function setWithdrawalAddy(address addy) external onlyDelegates {
        withdrawalAddy = addy;
    }

    function setMaxSupply(uint256 new_max_supply) external onlyDelegates {
        MAX_SUPPLY = new_max_supply;
    }

    // Mint fns
    function ghostyMint(uint256 quantity, address[] calldata recipients)
        external
        onlyDelegates
    {
        minty(quantity, recipients);
    }

    // Internal fns
    function minty(uint256 quantity, address[] calldata recipients) internal {
        require(quantity > 0, "Can't mint 0 tokens!");
        require(
            quantity == recipients.length || recipients.length == 1,
            "Call data is invalid"
        ); // dev: Call parameters are no bueno
        uint256 totSup = totalSupply();
        require(quantity + totSup <= MAX_SUPPLY, "Max supply reached!");

        address mintTo;
        for (uint256 i; i < quantity; i++) {
            mintTo = recipients.length == 1 ? recipients[0] : recipients[i];
            //_safeMint(mintTo, totSup + i + _offset);
            _safeMint(mintTo, next());
        }
    }

    function withdraw() external onlyDelegates {
        uint256 contract_balance = address(this).balance;

        address payable w_addy = payable(withdrawalAddy);

        (bool success, ) = w_addy.call{value: (contract_balance)}("");
        require(success, "Withdrawal failed!");

        emit Withdrawn(w_addy, contract_balance);
    }
}

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



// SPDX-License-Identifier: MIT
// 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



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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: contracts/GuardianLiteB2FA.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ILockERC721.sol";

contract GuardianLiteB2FA {
    ILockERC721 public immutable LOCKABLE;

    mapping(address => address) public guardians;

    event GuardianSet(address indexed guardian, address indexed user);
    event GuardianRenounce(address indexed guardian, address indexed user);

    /**
     * using address(this) when the Guardian is deployed in the same contract as the ERC721B
     */
    constructor() {
        LOCKABLE = ILockERC721(address(this));
    }

    function setGuardian(address _guardian) external {
        require(guardians[msg.sender] == address(0), "Guardian set");
        require(msg.sender != _guardian, "Guardian must be a different wallet");
        guardians[msg.sender] = _guardian;
        emit GuardianSet(_guardian, msg.sender);
    }

    function renounce(address _tokenOwner) external {
        require(guardians[_tokenOwner] == msg.sender, "!guardian");
        guardians[_tokenOwner] = address(0);
        emit GuardianRenounce(msg.sender, _tokenOwner);
    }

    function lockMany(uint256[] calldata _tokenIds) external {
        address owner = LOCKABLE.ownerOf(_tokenIds[0]);
        require(guardians[owner] == msg.sender, "!guardian");
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            require(LOCKABLE.ownerOf(_tokenIds[i]) == owner, "!owner");
            LOCKABLE.lockId(_tokenIds[i]);
        }
    }

    function unlockMany(uint256[] calldata _tokenIds) external {
        address owner = LOCKABLE.ownerOf(_tokenIds[0]);
        require(guardians[owner] == msg.sender, "!guardian");
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            require(LOCKABLE.ownerOf(_tokenIds[i]) == owner, "!owner");
            LOCKABLE.unlockId(_tokenIds[i]);
        }
    }

    /** Modified to grant temporary approval on the token,
     *   to the guardian contract, before initiating transfer */
    function unlockManyAndTransfer(
        uint256[] calldata _tokenIds,
        address _recipient
    ) external {
        address owner = LOCKABLE.ownerOf(_tokenIds[0]);
        require(guardians[owner] == msg.sender, "!guardian");
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            require(LOCKABLE.ownerOf(_tokenIds[i]) == owner, "!owner");
            LOCKABLE.temporaryApproval(_tokenIds[i]);
            LOCKABLE.unlockId(_tokenIds[i]);
            LOCKABLE.safeTransferFrom(owner, _recipient, _tokenIds[i]);
        }
    }
}

// File: contracts/ERC721B2FAEnumLite.sol



// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.13;
/***
 *************************************************************************
 * ERC721B2FA - Ultra Low Gas - 2 Factor Authentication                  *
 * @author: @ghooost0x2a                                                 *
 *************************************************************************
 * ERC721B2FA is a modified version of EnumerableLite, by @squuebo_nft   *
 * and the LockRegistry/Guardian contracts by @OwlOfMoistness            *
 *************************************************************************
 *     :::::::              ::::::::      :::                            *
 *    :+:   :+: :+:    :+: :+:    :+:   :+: :+:                          *
 *    +:+  :+:+  +:+  +:+        +:+   +:+   +:+                         *
 *    +#+ + +:+   +#++:+       +#+    +#++:++#++:                        *
 *    +#+#  +#+  +#+  +#+    +#+      +#+     +#+                        *
 *    #+#   #+# #+#    #+#  #+#       #+#     #+#                        *
 *     #######             ########## ###     ###                        *
 *************************************************************************/

import "./ERC721BLockRegistry.sol";
import "./IBatch.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";

abstract contract ERC721B2FAEnumLite is
    ERC721BLockRegistry,
    IBatch,
    IERC721Enumerable
{
    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _offset
    ) ERC721BLockRegistry(_name, _symbol, _offset) {}

    function isOwnerOf(address account, uint256[] calldata tokenIds)
        external
        view
        override
        returns (bool)
    {
        for (uint256 i; i < tokenIds.length; ++i) {
            if (_owners[tokenIds[i]] != account) return false;
        }

        return true;
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(IERC165, ERC721B)
        returns (bool)
    {
        return
            interfaceId == type(IERC721Enumerable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function tokenOfOwnerByIndex(address owner, uint256 index)
        public
        view
        override
        returns (uint256 tokenId)
    {
        uint256 count;
        for (uint256 i; i < _owners.length; ++i) {
            if (owner == _owners[i]) {
                if (count == index) return i;
                else ++count;
            }
        }

        require(false, "ERC721Enumerable: owner index out of bounds");
    }

    function tokenByIndex(uint256 index)
        external
        view
        virtual
        override
        returns (uint256)
    {
        require(
            index < totalSupply(),
            "ERC721Enumerable: global index out of bounds"
        );
        return index;
    }

    function totalSupply()
        public
        view
        override(ERC721B, IERC721Enumerable)
        returns (uint256)
    {
        return _owners.length - _offset;
    }

    // Modified to call ERC721BLockRegistry's safeTransferFrom (to account for 2FA)
    function transferBatch(
        address from,
        address to,
        uint256[] calldata tokenIds,
        bytes calldata data
    ) external override {
        for (uint256 i; i < tokenIds.length; ++i) {
            ERC721BLockRegistry.safeTransferFrom(from, to, tokenIds[i], data);
        }
    }

    function walletOfOwner(address account)
        external
        view
        override
        returns (uint256[] memory)
    {
        uint256 quantity = balanceOf(account);
        uint256[] memory wallet = new uint256[](quantity);
        for (uint256 i; i < quantity; ++i) {
            wallet[i] = tokenOfOwnerByIndex(account, i);
        }
        return wallet;
    }
}

// File: contracts/ILockERC721.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import "./ERC721B.sol";

/**
 * Modified interface to add temporaryApproval for guardian contract
 */
interface ILockERC721 is IERC721 {
    function lockId(uint256 _id) external;

    function unlockId(uint256 _id) external;

    function freeId(uint256 _id, address _contract) external;

    function temporaryApproval(uint256 _id) external;
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @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);

    /**
     * @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: contracts/IBatch.sol



// SPDX-License-Identifier: BSD-3-Clause

pragma solidity ^0.8.13;

interface IBatch {
    function isOwnerOf(address account, uint256[] calldata tokenIds)
        external
        view
        returns (bool);

    function transferBatch(
        address from,
        address to,
        uint256[] calldata tokenIds,
        bytes calldata data
    ) external;

    function walletOfOwner(address account)
        external
        view
        returns (uint256[] memory);
}

// File: contracts/ERC721BLockRegistry.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.2;

/*
 *     ,_,
 *    (',')
 *    {/"\}
 *    -"-"-
 */

import "./ERC721B.sol";
import "./LockRegistry.sol";
import "./ILockERC721.sol";

abstract contract ERC721BLockRegistry is ERC721B, LockRegistry, ILockERC721 {
    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _offset
    ) ERC721B(_name, _symbol, _offset) {}

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public override(ERC721B, IERC721) {
        require(isUnlocked(tokenId), "Token is locked");
        ERC721B.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public override(ERC721B, IERC721) {
        require(isUnlocked(tokenId), "Token is locked");
        ERC721B.safeTransferFrom(from, to, tokenId, _data);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public override(ERC721B, IERC721) {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * Added this function to be called (from an approvedContract's unlockManyAndTransfer)
     * so that the user doesn't need to provide authorization to the guardian contract, in advance
     */
    function temporaryApproval(uint256 tokenId) external {
        require(_exists(tokenId), "Token !exist");
        require(!isUnlocked(tokenId), "Token !locked");
        require(
            LockRegistry.approvedContract[_msgSender()],
            "Not approved contract"
        );
        ERC721B._approve(_msgSender(), tokenId);
    }

    function lockId(uint256 _id) external override {
        require(_exists(_id), "Token !exist");
        _lockId(_id);
    }

    function unlockId(uint256 _id) external override {
        require(_exists(_id), "Token !exist");
        _unlockId(_id);
    }

    function freeId(uint256 _id, address _contract)
        external
        override
        onlyDelegates
    {
        require(_exists(_id), "Token !exist");
        _freeId(_id, _contract);
    }
}

// File: contracts/ERC721B.sol



// SPDX-License-Identifier: BSD-3-Clause

pragma solidity ^0.8.0;

/****************************************
 * @author: squeebo_nft                 *
 * @team:   GoldenX                     *
 ****************************************
 *   Blimpie-ERC721 provides low-gas    *
 *           mints + transfers          *
 ****************************************/
//INTERFACES
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
//CONTRACTS
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

abstract contract ERC721B is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;

    string private _name;
    string private _symbol;

    uint256 internal _offset;
    address[] internal _owners;

    mapping(uint256 => address) private _tokenApprovals;
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    constructor(
        string memory name_,
        string memory symbol_,
        uint256 offset
    ) {
        _name = name_;
        _symbol = symbol_;
        _offset = offset;
        for (uint256 i; i < _offset; ++i) {
            _owners.push(address(0));
        }
    }

    //public
    function balanceOf(address owner)
        public
        view
        virtual
        override
        returns (uint256)
    {
        require(
            owner != address(0),
            "ERC721: balance query for the zero address"
        );

        uint256 count;
        for (uint256 i; i < _owners.length; ++i) {
            if (owner == _owners[i]) ++count;
        }
        return count;
    }

    function name() external view virtual override returns (string memory) {
        return _name;
    }

    function next() public view returns (uint256) {
        return _owners.length;
    }

    function ownerOf(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        address owner = _owners[tokenId];
        require(
            owner != address(0),
            "ERC721: owner query for nonexistent token"
        );
        return owner;
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC165, IERC165)
        returns (bool)
    {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function symbol() external view virtual override returns (string memory) {
        return _symbol;
    }

    function totalSupply() public view virtual returns (uint256) {
        return _owners.length - _offset;
    }

    function approve(address to, uint256 tokenId) external virtual override {
        address owner = ERC721B.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    function getApproved(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        require(
            _exists(tokenId),
            "ERC721: approved query for nonexistent token"
        );
        return _tokenApprovals[tokenId];
    }

    function isApprovedForAll(address owner, address operator)
        public
        view
        virtual
        override
        returns (bool)
    {
        return _operatorApprovals[owner][operator];
    }

    function setApprovalForAll(address operator, bool approved)
        external
        virtual
        override
    {
        require(operator != _msgSender(), "ERC721: approve to caller");
        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(
            _isApprovedOrOwner(_msgSender(), tokenId),
            "ERC721: transfer caller is not owner nor approved"
        );
        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId),
            "ERC721: transfer caller is not owner nor approved"
        );
        _safeTransfer(from, to, tokenId, _data);
    }

    //internal
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(
            _checkOnERC721Received(from, to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return tokenId < _owners.length && _owners[tokenId] != address(0);
    }

    function _isApprovedOrOwner(address spender, uint256 tokenId)
        internal
        view
        virtual
        returns (bool)
    {
        require(
            _exists(tokenId),
            "ERC721: operator query for nonexistent token"
        );
        address owner = ERC721B.ownerOf(tokenId);
        return (spender == owner ||
            getApproved(tokenId) == spender ||
            isApprovedForAll(owner, spender));
    }

    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);
        _owners.push(to);

        emit Transfer(address(0), to, tokenId);
    }

    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721B.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);
        _owners[tokenId] = address(0);

        emit Transfer(owner, address(0), tokenId);
    }

    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(
            ERC721B.ownerOf(tokenId) == from,
            "ERC721: transfer of token that is not own"
        );
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721B.ownerOf(tokenId), to, tokenId);
    }

    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try
                IERC721Receiver(to).onERC721Received(
                    _msgSender(),
                    from,
                    tokenId,
                    _data
                )
            returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert(
                        "ERC721: transfer to non ERC721Receiver implementer"
                    );
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// File: contracts/LockRegistry.sol



// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.2;

/*
 *     ,_,
 *    (',')
 *    {/"\}
 *    -"-"-
 */

import "./Delegated.sol";

abstract contract LockRegistry is Delegated {
    mapping(address => bool) public approvedContract;
    mapping(uint256 => uint256) public lockCount;
    mapping(uint256 => mapping(uint256 => address)) public lockMap;
    mapping(uint256 => mapping(address => uint256)) public lockMapIndex;

    event TokenLocked(
        uint256 indexed tokenId,
        address indexed approvedContract
    );
    event TokenUnlocked(
        uint256 indexed tokenId,
        address indexed approvedContract
    );

    function isUnlocked(uint256 _id) public view returns (bool) {
        return lockCount[_id] == 0;
    }

    function updateApprovedContracts(
        address[] calldata _contracts,
        bool[] calldata _values
    ) external onlyDelegates {
        require(_contracts.length == _values.length, "!length");
        for (uint256 i = 0; i < _contracts.length; i++)
            approvedContract[_contracts[i]] = _values[i];
    }

    function _lockId(uint256 _id) internal {
        require(approvedContract[msg.sender], "Cannot update map");
        require(
            lockMapIndex[_id][msg.sender] == 0,
            "ID already locked by caller"
        );

        uint256 count = lockCount[_id] + 1;
        lockMap[_id][count] = msg.sender;
        lockMapIndex[_id][msg.sender] = count;
        lockCount[_id]++;
        emit TokenLocked(_id, msg.sender);
    }

    function _unlockId(uint256 _id) internal {
        require(approvedContract[msg.sender], "Cannot update map");
        uint256 index = lockMapIndex[_id][msg.sender];
        require(index != 0, "ID not locked by caller");

        uint256 last = lockCount[_id];
        if (index != last) {
            address lastContract = lockMap[_id][last];
            lockMap[_id][index] = lastContract;
            lockMap[_id][last] = address(0);
            lockMapIndex[_id][lastContract] = index;
        } else lockMap[_id][index] = address(0);
        lockMapIndex[_id][msg.sender] = 0;
        lockCount[_id]--;
        emit TokenUnlocked(_id, msg.sender);
    }

    function _freeId(uint256 _id, address _contract) internal {
        require(!approvedContract[_contract], "Cannot update map");
        uint256 index = lockMapIndex[_id][_contract];
        require(index != 0, "ID not locked");

        uint256 last = lockCount[_id];
        if (index != last) {
            address lastContract = lockMap[_id][last];
            lockMap[_id][index] = lastContract;
            lockMap[_id][last] = address(0);
            lockMapIndex[_id][lastContract] = index;
        } else lockMap[_id][index] = address(0);
        lockMapIndex[_id][_contract] = 0;
        lockCount[_id]--;
        emit TokenUnlocked(_id, _contract);
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: contracts/Delegated.sol



// SPDX-License-Identifier: BSD-3-Clause

pragma solidity ^0.8.0;

/********************
 * @author: Squeebo *
 ********************/

import "@openzeppelin/contracts/access/Ownable.sol";

contract Delegated is Ownable {
    mapping(address => bool) internal _delegates;

    constructor() {
        _delegates[owner()] = true;
    }

    modifier onlyDelegates() {
        require(_delegates[msg.sender], "Invalid delegate");
        _;
    }

    //onlyOwner
    function isDelegate(address addr) external view onlyOwner returns (bool) {
        return _delegates[addr];
    }

    function setDelegate(address addr, bool isDelegate_) external onlyOwner {
        _delegates[addr] = isDelegate_;
    }

    function transferOwnership(address newOwner)
        public
        virtual
        override
        onlyOwner
    {
        _delegates[newOwner] = true;
        super.transferOwnership(newOwner);
    }
}

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



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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



// SPDX-License-Identifier: MIT
// 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/token/ERC721/extensions/IERC721Metadata.sol



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

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

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

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



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

pragma solidity ^0.8.0;

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

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



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

pragma solidity ^0.8.0;

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

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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