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// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "./SpacerBase.sol";

/**
 * @title SpacerItems
 * @author RMRK team
 */
contract SpacerItems is SpacerBase {
    constructor(
        string memory name_,
        string memory symbol_,
        string memory collectionMetadata_,
        InitData memory data
    ) SpacerBase(name_, symbol_, collectionMetadata_, data) {}

    function nestMintWithAssets(
        address to,
        uint256[] memory destinationIds,
        uint64[][] memory assetIds
    ) public virtual notLocked onlyOwnerOrContributor {
        uint256 totalDestinationIds = destinationIds.length;
        uint256 numToMint;
        uint64 assetId;
        uint256 tokenId;

        for (uint256 i; i < totalDestinationIds; ) {
            numToMint = assetIds[i].length;
            if (numToMint == 0) revert RMRKMintZero();
            if (numToMint + _nextId > _maxSupply) revert RMRKMintOverMax();

            uint256 nextToken = _nextId + 1;

            unchecked {
                _nextId += numToMint;
                _totalSupply += numToMint;
            }

            for (uint256 j; j < numToMint; ) {
                tokenId = nextToken + j;
                assetId = assetIds[i][j];
                _nestMint(to, tokenId, destinationIds[i], "");
                _addAssetToToken(tokenId, assetId, 0);
                _acceptAsset(tokenId, 0, assetId);
                unchecked {
                    ++j;
                }
            }

            unchecked {
                ++i;
            }
        }
    }

    function mintWithAssets(
        address[] memory to,
        uint64[] memory assetIds
    ) public virtual notLocked onlyOwnerOrContributor {
        uint256 numToMint = to.length;
        uint256 tokenId;

        if (numToMint == 0) revert RMRKMintZero();
        if (numToMint + _nextId > _maxSupply) revert RMRKMintOverMax();

        uint256 nextToken = _nextId + 1;
        unchecked {
            _nextId += numToMint;
            _totalSupply += numToMint;
        }
        for (uint256 i; i < numToMint; ) {
            tokenId = nextToken + i;
            _addAssetToToken(i, assetIds[i], 0);
            _acceptAsset(i, 0, assetIds[i]);
            _safeMint(to[i], i, "");
            unchecked {
                ++i;
            }
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * 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);
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// 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;
    }
}

// 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);
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title IRMRKInitData
 * @author RMRK team
 * @notice Interface representation of RMRK initialization data.
 * @dev This interface provides a struct used to pack data to avoid stack too deep error for too many arguments.
 */
interface IRMRKInitData {
    /**
     * @notice Used to provide initialization data without running into stack too deep errors.
     * @return erc20TokenAddress Address of the ERC20 token to be used when initializing a smart contract that supports
     *  ERC20 pay module
     * @return tokenUriIsEnumerable Weather the token URI is enumerable or not
     * @return royaltyRecipient Recipient of resale royalties
     * @return royaltyPercentageBps The percentage to be paid from the sale of the token expressed in basis points
     * @return maxSupply The maximum supply of tokens
     * @return pricePerMint The price per single-token mint expressed in the lowest denomination of native currency
     */
    struct InitData {
        address erc20TokenAddress; // 20 bytes
        bool tokenUriIsEnumerable; // 1 byte
        // --- new slot ---
        address royaltyRecipient; // 20 bytes
        uint16 royaltyPercentageBps; // 2 bytes
        // --- new slot ---
        uint256 maxSupply;
        // --- new slot ---
        uint256 pricePerMint;
        // another 32 bytes
    }
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/utils/Context.sol";
import "../library/RMRKErrors.sol";

/**
 * @title Ownable
 * @author RMRK team
 * @notice A minimal ownable smart contractf or owner and contributors.
 * @dev This smart contract is based on "openzeppelin's access/Ownable.sol".
 */
contract Ownable is Context {
    address private _owner;
    mapping(address => uint256) private _contributors;

    /**
     * @notice Used to anounce the transfer of ownership.
     * @param previousOwner Address of the account that transferred their ownership role
     * @param newOwner Address of the account receiving the ownership role
     */
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @notice Event that signifies that an address was granted contributor role or that the permission has been
     *  revoked.
     * @dev This can only be triggered by a current owner, so there is no need to include that information in the event.
     * @param contributor Address of the account that had contributor role status updated
     * @param isContributor A boolean value signifying whether the role has been granted (`true`) or revoked (`false`)
     */
    event ContributorUpdate(address indexed contributor, bool isContributor);

    /**
     * @dev Reverts if called by any account other than the owner or an approved contributor.
     */
    modifier onlyOwnerOrContributor() {
        _onlyOwnerOrContributor();
        _;
    }

    /**
     * @dev Reverts if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _onlyOwner();
        _;
    }

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

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

    /**
     * @notice Leaves the contract without owner. Functions using the `onlyOwner` modifier will be disabled.
     * @dev Can only be called by the current owner.
     * @dev 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));
    }

    /**
     * @notice Transfers ownership of the contract to a new owner.
     * @dev Can only be called by the current owner.
     * @param newOwner Address of the new owner's account
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) revert RMRKNewOwnerIsZeroAddress();
        _transferOwnership(newOwner);
    }

    /**
     * @notice Transfers ownership of the contract to a new owner.
     * @dev Internal function without access restriction.
     * @dev Emits ***OwnershipTransferred*** event.
     * @param newOwner Address of the new owner's account
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @notice Adds or removes a contributor to the smart contract.
     * @dev Can only be called by the owner.
     * @dev Emits ***ContributorUpdate*** event.
     * @param contributor Address of the contributor's account
     * @param grantRole A boolean value signifying whether the contributor role is being granted (`true`) or revoked
     *  (`false`)
     */
    function manageContributor(
        address contributor,
        bool grantRole
    ) external onlyOwner {
        if (contributor == address(0)) revert RMRKNewContributorIsZeroAddress();
        grantRole
            ? _contributors[contributor] = 1
            : _contributors[contributor] = 0;
        emit ContributorUpdate(contributor, grantRole);
    }

    /**
     * @notice Used to check if the address is one of the contributors.
     * @param contributor Address of the contributor whose status we are checking
     * @return Boolean value indicating whether the address is a contributor or not
     */
    function isContributor(address contributor) public view returns (bool) {
        return _contributors[contributor] == 1;
    }

    /**
     * @notice Used to verify that the caller is either the owner or a contributor.
     * @dev If the caller is not the owner or a contributor, the execution will be reverted.
     */
    function _onlyOwnerOrContributor() private view {
        if (owner() != _msgSender() && !isContributor(_msgSender()))
            revert RMRKNotOwnerOrContributor();
    }

    /**
     * @notice Used to verify that the caller is the owner.
     * @dev If the caller is not the owner, the execution will be reverted.
     */
    function _onlyOwner() private view {
        if (owner() != _msgSender()) revert RMRKNotOwner();
    }
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "./Ownable.sol";
import "../library/RMRKErrors.sol";

/**
 * @title OwnableLock
 * @author RMRK team
 * @notice A minimal ownable lock smart contract.
 */
contract OwnableLock is Ownable {
    uint256 private _lock;

    /**
     * @notice Reverts if the lock flag is set to true.
     */
    modifier notLocked() {
        _onlyNotLocked();
        _;
    }

    /**
     * @notice Locks the operation.
     * @dev Once locked, functions using `notLocked` modifier cannot be executed.
     */
    function setLock() public virtual onlyOwner {
        _lock = 1;
    }

    /**
     * @notice Used to retrieve the status of a lockable smart contract.
     * @return A boolean value signifying whether the smart contract has been locked
     */
    function getLock() public view returns (bool) {
        return _lock == 1;
    }

    /**
     * @notice Used to verify that the operation of the smart contract is not locked.
     * @dev If the operation of the smart contract is locked, the execution will be reverted.
     */
    function _onlyNotLocked() private view {
        if (_lock == 1) revert RMRKLocked();
    }
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @title IRMRKCatalog
 * @author RMRK team
 * @notice An interface Catalog for RMRK equippable module.
 */
interface IRMRKCatalog is IERC165 {
    /**
     * @notice Event to announce addition of a new part.
     * @dev It is emitted when a new part is added.
     * @param partId ID of the part that was added
     * @param itemType Enum value specifying whether the part is `None`, `Slot` and `Fixed`
     * @param zIndex An uint specifying the z value of the part. It is used to specify the depth which the part should
     *  be rendered at
     * @param equippableAddresses An array of addresses that can equip this part
     * @param metadataURI The metadata URI of the part
     */
    event AddedPart(
        uint64 indexed partId,
        ItemType indexed itemType,
        uint8 zIndex,
        address[] equippableAddresses,
        string metadataURI
    );

    /**
     * @notice Event to announce new equippables to the part.
     * @dev It is emitted when new addresses are marked as equippable for `partId`.
     * @param partId ID of the part that had new equippable addresses added
     * @param equippableAddresses An array of the new addresses that can equip this part
     */
    event AddedEquippables(
        uint64 indexed partId,
        address[] equippableAddresses
    );

    /**
     * @notice Event to announce the overriding of equippable addresses of the part.
     * @dev It is emitted when the existing list of addresses marked as equippable for `partId` is overwritten by a new one.
     * @param partId ID of the part whose list of equippable addresses was overwritten
     * @param equippableAddresses The new, full, list of addresses that can equip this part
     */
    event SetEquippables(uint64 indexed partId, address[] equippableAddresses);

    /**
     * @notice Event to announce that a given part can be equipped by any address.
     * @dev It is emitted when a given part is marked as equippable by any.
     * @param partId ID of the part marked as equippable by any address
     */
    event SetEquippableToAll(uint64 indexed partId);

    /**
     * @notice Used to define a type of the item. Possible values are `None`, `Slot` or `Fixed`.
     * @dev Used for fixed and slot parts.
     */
    enum ItemType {
        None,
        Slot,
        Fixed
    }

    /**
     * @notice The integral structure of a standard RMRK catalog item defining it.
     * @dev Requires a minimum of 3 storage slots per catalog item, equivalent to roughly 60,000 gas as of Berlin hard
     *  fork (April 14, 2021), though 5-7 storage slots is more realistic, given the standard length of an IPFS URI.
     *  This will result in between 25,000,000 and 35,000,000 gas per 250 assets--the maximum block size of Ethereum
     *  mainnet is 30M at peak usage.
     * @return itemType The item type of the part
     * @return z The z value of the part defining how it should be rendered when presenting the full NFT
     * @return equippable The array of addresses allowed to be equipped in this part
     * @return metadataURI The metadata URI of the part
     */
    struct Part {
        ItemType itemType; //1 byte
        uint8 z; //1 byte
        address[] equippable; //n Collections that can be equipped into this slot
        string metadataURI; //n bytes 32+
    }

    /**
     * @notice The structure used to add a new `Part`.
     * @dev The part is added with specified ID, so you have to make sure that you are using an unused `partId`,
     *  otherwise the addition of the part vill be reverted.
     * @dev The full `IntakeStruct` looks like this:
     *  [
     *          partID,
     *      [
     *          itemType,
     *          z,
     *          [
     *               permittedCollectionAddress0,
     *               permittedCollectionAddress1,
     *               permittedCollectionAddress2
     *           ],
     *           metadataURI
     *       ]
     *   ]
     * @return partId ID to be assigned to the `Part`
     * @return part A `Part` to be added
     */
    struct IntakeStruct {
        uint64 partId;
        Part part;
    }

    /**
     * @notice Used to return the metadata URI of the associated Catalog.
     * @return Catalog metadata URI
     */
    function getMetadataURI() external view returns (string memory);

    /**
     * @notice Used to return the `itemType` of the associated Catalog
     * @return `itemType` of the associated Catalog
     */
    function getType() external view returns (string memory);

    /**
     * @notice Used to check whether the given address is allowed to equip the desired `Part`.
     * @dev Returns true if a collection may equip asset with `partId`.
     * @param partId The ID of the part that we are checking
     * @param targetAddress The address that we are checking for whether the part can be equipped into it or not
     * @return The status indicating whether the `targetAddress` can be equipped into `Part` with `partId` or not
     */
    function checkIsEquippable(
        uint64 partId,
        address targetAddress
    ) external view returns (bool);

    /**
     * @notice Used to check if the part is equippable by all addresses.
     * @dev Returns true if part is equippable to all.
     * @param partId ID of the part that we are checking
     * @return The status indicating whether the part with `partId` can be equipped by any address or not
     */
    function checkIsEquippableToAll(uint64 partId) external view returns (bool);

    /**
     * @notice Used to retrieve a `Part` with id `partId`
     * @param partId ID of the part that we are retrieving
     * @return The `Part` struct associated with given `partId`
     */
    function getPart(uint64 partId) external view returns (Part memory);

    /**
     * @notice Used to retrieve multiple parts at the same time.
     * @param partIds An array of part IDs that we want to retrieve
     * @return An array of `Part` structs associated with given `partIds`
     */
    function getParts(
        uint64[] memory partIds
    ) external view returns (Part[] memory);
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title IRMRKCore
 * @author RMRK team
 * @notice Interface smart contract for RMRK core module.
 */
interface IRMRKCore {
    /**
     * @notice Used to retrieve the collection name.
     * @return Name of the collection
     */
    function name() external view returns (string memory);

    /**
     * @notice Used to retrieve the collection symbol.
     * @return Symbol of the collection
     */
    function symbol() external view returns (string memory);
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "./IRMRKCore.sol";

/**
 * @title RMRKCore
 * @author RMRK team
 * @notice Smart contract of the RMRK core module.
 * @dev This is currently just a passthrough contract which allows for granular editing of base-level ERC721 functions.
 */
contract RMRKCore is IRMRKCore {
    /**
     * @notice Version of the @rmrk-team/evm-contracts package
     * @return Version identifier of the smart contract
     */
    string public constant VERSION = "1.0.1";

    /**
     * @notice Used to initialize the smart contract.
     * @param name_ Name of the token collection
     * @param symbol_ Symbol of the token collection
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /// Token name
    string private _name;

    /// Token symbol
    string private _symbol;

    /**
     * @notice Used to retrieve the collection name.
     * @return Name of the collection
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @notice Used to retrieve the collection symbol.
     * @return Symbol of the collection
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @notice Hook that is called before any token transfer. This includes minting and burning.
     * @dev 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 to `to`.
     *  - When `to` is zero, ``from``'s `tokenId` will be burned.
     *  - `from` and `to` are never zero at the same time.
     *
     *  To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param from Address from which the token is being transferred
     * @param to Address to which the token is being transferred
     * @param tokenId ID of the token being transferred
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

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

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "../multiasset/IERC5773.sol";

/**
 * @title IERC6220
 * @author RMRK team
 * @notice Interface smart contract of the RMRK equippable module.
 */
interface IERC6220 is IERC5773 {
    /**
     * @notice Used to store the core structure of the `Equippable` RMRK lego.
     * @return assetId The ID of the asset equipping a child
     * @return childAssetId The ID of the asset used as equipment
     * @return childId The ID of token that is equipped
     * @return childEquippableAddress Address of the collection to which the child asset belongs to
     */
    struct Equipment {
        uint64 assetId;
        uint64 childAssetId;
        uint256 childId;
        address childEquippableAddress;
    }

    /**
     * @notice Used to provide a struct for inputing equip data.
     * @dev Only used for input and not storage of data.
     * @return tokenId ID of the token we are managing
     * @return childIndex Index of a child in the list of token's active children
     * @return assetId ID of the asset that we are equipping into
     * @return slotPartId ID of the slot part that we are using to equip
     * @return childAssetId ID of the asset that we are equipping
     */
    struct IntakeEquip {
        uint256 tokenId;
        uint256 childIndex;
        uint64 assetId;
        uint64 slotPartId;
        uint64 childAssetId;
    }

    /**
     * @notice Used to notify listeners that a child's asset has been equipped into one of its parent assets.
     * @param tokenId ID of the token that had an asset equipped
     * @param assetId ID of the asset associated with the token we are equipping into
     * @param slotPartId ID of the slot we are using to equip
     * @param childId ID of the child token we are equipping into the slot
     * @param childAddress Address of the child token's collection
     * @param childAssetId ID of the asset associated with the token we are equipping
     */
    event ChildAssetEquipped(
        uint256 indexed tokenId,
        uint64 indexed assetId,
        uint64 indexed slotPartId,
        uint256 childId,
        address childAddress,
        uint64 childAssetId
    );

    /**
     * @notice Used to notify listeners that a child's asset has been unequipped from one of its parent assets.
     * @param tokenId ID of the token that had an asset unequipped
     * @param assetId ID of the asset associated with the token we are unequipping out of
     * @param slotPartId ID of the slot we are unequipping from
     * @param childId ID of the token being unequipped
     * @param childAddress Address of the collection that a token that is being unequipped belongs to
     * @param childAssetId ID of the asset associated with the token we are unequipping
     */
    event ChildAssetUnequipped(
        uint256 indexed tokenId,
        uint64 indexed assetId,
        uint64 indexed slotPartId,
        uint256 childId,
        address childAddress,
        uint64 childAssetId
    );

    /**
     * @notice Used to notify listeners that the assets belonging to a `equippableGroupId` have been marked as
     *  equippable into a given slot and parent
     * @param equippableGroupId ID of the equippable group being marked as equippable into the slot associated with
     *  `slotPartId` of the `parentAddress` collection
     * @param slotPartId ID of the slot part of the catalog into which the parts belonging to the equippable group
     *  associated with `equippableGroupId` can be equipped
     * @param parentAddress Address of the collection into which the parts belonging to `equippableGroupId` can be
     *  equipped
     */
    event ValidParentEquippableGroupIdSet(
        uint64 indexed equippableGroupId,
        uint64 indexed slotPartId,
        address parentAddress
    );

    /**
     * @notice Used to equip a child into a token.
     * @dev The `IntakeEquip` stuct contains the following data:
     *  [
     *      tokenId,
     *      childIndex,
     *      assetId,
     *      slotPartId,
     *      childAssetId
     *  ]
     * @param data An `IntakeEquip` struct specifying the equip data
     */
    function equip(IntakeEquip memory data) external;

    /**
     * @notice Used to unequip child from parent token.
     * @dev This can only be called by the owner of the token or by an account that has been granted permission to
     *  manage the given token by the current owner.
     * @param tokenId ID of the parent from which the child is being unequipped
     * @param assetId ID of the parent's asset that contains the `Slot` into which the child is equipped
     * @param slotPartId ID of the `Slot` from which to unequip the child
     */
    function unequip(
        uint256 tokenId,
        uint64 assetId,
        uint64 slotPartId
    ) external;

    /**
     * @notice Used to check whether the token has a given child equipped.
     * @dev This is used to prevent from transferring a child that is equipped.
     * @param tokenId ID of the parent token for which we are querying for
     * @param childAddress Address of the child token's smart contract
     * @param childId ID of the child token
     * @return A boolean value indicating whether the child token is equipped into the given token or not
     */
    function isChildEquipped(
        uint256 tokenId,
        address childAddress,
        uint256 childId
    ) external view returns (bool);

    /**
     * @notice Used to verify whether a token can be equipped into a given parent's slot.
     * @param parent Address of the parent token's smart contract
     * @param tokenId ID of the token we want to equip
     * @param assetId ID of the asset associated with the token we want to equip
     * @param slotId ID of the slot that we want to equip the token into
     * @return A boolean indicating whether the token with the given asset can be equipped into the desired slot
     */
    function canTokenBeEquippedWithAssetIntoSlot(
        address parent,
        uint256 tokenId,
        uint64 assetId,
        uint64 slotId
    ) external view returns (bool);

    /**
     * @notice Used to get the Equipment object equipped into the specified slot of the desired token.
     * @dev The `Equipment` struct consists of the following data:
     *  [
     *      assetId,
     *      childAssetId,
     *      childId,
     *      childEquippableAddress
     *  ]
     * @param tokenId ID of the token for which we are retrieving the equipped object
     * @param targetCatalogAddress Address of the `Catalog` associated with the `Slot` part of the token
     * @param slotPartId ID of the `Slot` part that we are checking for equipped objects
     * @return The `Equipment` struct containing data about the equipped object
     */
    function getEquipment(
        uint256 tokenId,
        address targetCatalogAddress,
        uint64 slotPartId
    ) external view returns (Equipment memory);

    /**
     * @notice Used to get the asset and equippable data associated with given `assetId`.
     * @param tokenId ID of the token for which to retrieve the asset
     * @param assetId ID of the asset of which we are retrieving
     * @return metadataURI The metadata URI of the asset
     * @return equippableGroupId ID of the equippable group this asset belongs to
     * @return catalogAddress The address of the catalog the part belongs to
     * @return partIds An array of IDs of parts included in the asset
     */
    function getAssetAndEquippableData(
        uint256 tokenId,
        uint64 assetId
    )
        external
        view
        returns (
            string memory metadataURI,
            uint64 equippableGroupId,
            address catalogAddress,
            uint64[] memory partIds
        );
}

// SPDX-License-Identifier: Apache-2.0

//Generally all interactions should propagate downstream

pragma solidity ^0.8.18;

import "../catalog/IRMRKCatalog.sol";
import "../library/RMRKLib.sol";
import "../multiasset/AbstractMultiAsset.sol";
import "../nestable/RMRKNestable.sol";
import "../security/ReentrancyGuard.sol";
import "./IERC6220.sol";

/**
 * @title RMRKEquippable
 * @author RMRK team
 * @notice Smart contract of the RMRK Equippable module.
 */
contract RMRKEquippable is
    ReentrancyGuard,
    RMRKNestable,
    AbstractMultiAsset,
    IERC6220
{
    using RMRKLib for uint64[];

    // ------------------- ASSETS --------------

    // ------------------- ASSET APPROVALS --------------

    /**
     * @notice Mapping from token ID to approver address to approved address for assets.
     * @dev The approver is necessary so approvals are invalidated for nested children on transfer.
     * @dev WARNING: If a child NFT returns the original root owner, old permissions would be active again.
     */
    mapping(uint256 => mapping(address => address))
        private _tokenApprovalsForAssets;

    // ------------------- EQUIPPABLE --------------
    /// Mapping of uint64 asset ID to corresponding catalog address.
    mapping(uint64 => address) private _catalogAddresses;
    /// Mapping of uint64 ID to asset object.
    mapping(uint64 => uint64) private _equippableGroupIds;
    /// Mapping of assetId to catalog parts applicable to this asset, both fixed and slot
    mapping(uint64 => uint64[]) private _partIds;

    /// Mapping of token ID to catalog address to slot part ID to equipment information. Used to compose an NFT.
    mapping(uint256 => mapping(address => mapping(uint64 => Equipment)))
        private _equipments;

    /// Mapping of token ID to child (nestable) address to child ID to count of equipped items. Used to check if equipped.
    mapping(uint256 => mapping(address => mapping(uint256 => uint256)))
        private _equipCountPerChild;

    /// Mapping of `equippableGroupId` to parent contract address and valid `slotId`.
    mapping(uint64 => mapping(address => uint64)) private _validParentSlots;

    /**
     * @notice Used to verify that the caller is either the owner of the given token or approved to manage the token's assets
     *  of the owner.
     * @param tokenId ID of the token that we are checking
     */
    function _onlyApprovedForAssetsOrOwner(uint256 tokenId) private view {
        if (!_isApprovedForAssetsOrOwner(_msgSender(), tokenId))
            revert RMRKNotApprovedForAssetsOrOwner();
    }

    /**
     * @notice Used to ensure that the caller is either the owner of the given token or approved to manage the token's assets
     *  of the owner.
     * @dev If that is not the case, the execution of the function will be reverted.
     * @param tokenId ID of the token that we are checking
     */
    modifier onlyApprovedForAssetsOrOwner(uint256 tokenId) {
        _onlyApprovedForAssetsOrOwner(tokenId);
        _;
    }

    // ----------------------------- CONSTRUCTOR ------------------------------

    /**
     * @notice Initializes the contract by setting a `name` and a `symbol` of the token collection.
     * @param name_ Name of the token collection
     * @param symbol_ Symbol of the token collection
     */
    constructor(
        string memory name_,
        string memory symbol_
    ) RMRKNestable(name_, symbol_) {}

    /**
     * @inheritdoc IERC165
     */
    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override(IERC165, RMRKNestable) returns (bool) {
        return
            RMRKNestable.supportsInterface(interfaceId) ||
            interfaceId == type(IERC5773).interfaceId ||
            interfaceId == type(IERC6220).interfaceId;
    }

    // ------------------------------- ASSETS ------------------------------

    // --------------------------- ASSET HANDLERS -------------------------

    /**
     * @notice Accepts a asset at from the pending array of given token.
     * @dev Migrates the asset from the token's pending asset array to the token's active asset array.
     * @dev Active assets cannot be removed by anyone, but can be replaced by a new asset.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     *  - `index` must be in range of the length of the pending asset array.
     * @dev Emits an {AssetAccepted} event.
     * @param tokenId ID of the token for which to accept the pending asset
     * @param index Index of the asset in the pending array to accept
     * @param assetId ID of the asset that is being accepted
     */
    function acceptAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) public virtual onlyApprovedForAssetsOrOwner(tokenId) {
        _acceptAsset(tokenId, index, assetId);
    }

    /**
     * @notice Rejects a asset from the pending array of given token.
     * @dev Removes the asset from the token's pending asset array.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     *  - `index` must be in range of the length of the pending asset array.
     * @dev Emits a {AssetRejected} event.
     * @param tokenId ID of the token that the asset is being rejected from
     * @param index Index of the asset in the pending array to be rejected
     * @param assetId ID of the asset that is being rejected
     */
    function rejectAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) public virtual onlyApprovedForAssetsOrOwner(tokenId) {
        _rejectAsset(tokenId, index, assetId);
    }

    /**
     * @notice Rejects all assets from the pending array of a given token.
     * @dev Effecitvely deletes the pending array.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     * @dev Emits a {AssetRejected} event with assetId = 0.
     * @param tokenId ID of the token of which to clear the pending array.
     * @param maxRejections Maximum number of expected assets to reject, used to prevent from rejecting assets which
     *  arrive just before this operation.
     */
    function rejectAllAssets(
        uint256 tokenId,
        uint256 maxRejections
    ) public virtual onlyApprovedForAssetsOrOwner(tokenId) {
        _rejectAllAssets(tokenId, maxRejections);
    }

    /**
     * @notice Sets a new priority array for a given token.
     * @dev The priority array is a non-sequential list of `uint64`s, where the lowest value is considered highest
     *  priority.
     * @dev Value `0` of a priority is a special case equivalent to unitialized.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     *  - The length of `priorities` must be equal the length of the active assets array.
     * @dev Emits a {AssetPrioritySet} event.
     * @param tokenId ID of the token to set the priorities for
     * @param priorities An array of priority values
     */
    function setPriority(
        uint256 tokenId,
        uint64[] calldata priorities
    ) public virtual onlyApprovedForAssetsOrOwner(tokenId) {
        _setPriority(tokenId, priorities);
    }

    // --------------------------- ASSET INTERNALS -------------------------

    /**
     * @notice Used to add a asset entry.
     * @dev This internal function warrants custom access control to be implemented when used.
     * @param id ID of the asset being added
     * @param equippableGroupId ID of the equippable group being marked as equippable into the slot associated with
     *  `Parts` of the `Slot` type
     * @param catalogAddress Address of the `Catalog` associated with the asset
     * @param metadataURI The metadata URI of the asset
     * @param partIds An array of IDs of fixed and slot parts to be included in the asset
     */
    function _addAssetEntry(
        uint64 id,
        uint64 equippableGroupId,
        address catalogAddress,
        string memory metadataURI,
        uint64[] memory partIds
    ) internal virtual {
        _addAssetEntry(id, metadataURI);

        if (catalogAddress == address(0) && partIds.length != 0)
            revert RMRKCatalogRequiredForParts();

        _catalogAddresses[id] = catalogAddress;
        _equippableGroupIds[id] = equippableGroupId;
        _partIds[id] = partIds;
    }

    // ----------------------- ASSET APPROVALS ------------------------

    /**
     * @notice Used to grant approvals for specific tokens to a specified address.
     * @dev This can only be called by the owner of the token or by an account that has been granted permission to
     *  manage all of the owner's assets.
     * @param to Address of the account to receive the approval to the specified token
     * @param tokenId ID of the token for which we are granting the permission
     */
    function approveForAssets(address to, uint256 tokenId) public virtual {
        address owner = ownerOf(tokenId);
        if (to == owner) revert RMRKApprovalForAssetsToCurrentOwner();

        if (
            _msgSender() != owner &&
            !isApprovedForAllForAssets(owner, _msgSender())
        ) revert RMRKApproveForAssetsCallerIsNotOwnerNorApprovedForAll();
        _approveForAssets(to, tokenId);
    }

    /**
     * @notice Used to get the address of the user that is approved to manage the specified token from the current
     *  owner.
     * @param tokenId ID of the token we are checking
     * @return Address of the account that is approved to manage the token
     */
    function getApprovedForAssets(
        uint256 tokenId
    ) public view virtual returns (address) {
        _requireMinted(tokenId);
        return _tokenApprovalsForAssets[tokenId][ownerOf(tokenId)];
    }

    /**
     * @notice Internal function to check whether the queried user is either:
     *   1. The root owner of the token associated with `tokenId`.
     *   2. Is approved for all assets of the current owner via the `setApprovalForAllForAssets` function.
     *   3. Is granted approval for the specific tokenId for asset management via the `approveForAssets` function.
     * @param user Address of the user we are checking for permission
     * @param tokenId ID of the token to query for permission for a given `user`
     * @return A boolean value indicating whether the user is approved to manage the token or not
     */
    function _isApprovedForAssetsOrOwner(
        address user,
        uint256 tokenId
    ) internal view virtual returns (bool) {
        address owner = ownerOf(tokenId);
        return (user == owner ||
            isApprovedForAllForAssets(owner, user) ||
            getApprovedForAssets(tokenId) == user);
    }

    /**
     * @notice Internal function for granting approvals for a specific token.
     * @param to Address of the account we are granting an approval to
     * @param tokenId ID of the token we are granting the approval for
     */
    function _approveForAssets(address to, uint256 tokenId) internal virtual {
        address owner = ownerOf(tokenId);
        _tokenApprovalsForAssets[tokenId][owner] = to;
        emit ApprovalForAssets(owner, to, tokenId);
    }

    /**
     * @notice Used to clear the approvals on a given token.
     * @param tokenId ID of the token we are clearing the approvals of
     */
    function _cleanApprovals(uint256 tokenId) internal virtual override {
        _approveForAssets(address(0), tokenId);
    }

    // ------------------------------- EQUIPPING ------------------------------

    /**
     * @inheritdoc RMRKNestable
     */
    function _transferChild(
        uint256 tokenId,
        address to,
        uint256 destinationId,
        uint256 childIndex,
        address childAddress,
        uint256 childId,
        bool isPending,
        bytes memory data
    ) internal virtual override {
        if (!isPending) {
            if (isChildEquipped(tokenId, childAddress, childId))
                revert RMRKMustUnequipFirst();
        }
        super._transferChild(
            tokenId,
            to,
            destinationId,
            childIndex,
            childAddress,
            childId,
            isPending,
            data
        );
    }

    /**
     * @inheritdoc IERC6220
     */
    function equip(
        IntakeEquip memory data
    ) public virtual onlyApprovedOrOwner(data.tokenId) nonReentrant {
        _equip(data);
    }

    /**
     * @notice Private function used to equip a child into a token.
     * @dev If the `Slot` already has an item equipped, the execution will be reverted.
     * @dev If the child can't be used in the given `Slot`, the execution will be reverted.
     * @dev If the catalog doesn't allow this equip to happen, the execution will be reverted.
     * @dev The `IntakeEquip` stuct contains the following data:
     *  [
     *      tokenId,
     *      childIndex,
     *      assetId,
     *      slotPartId,
     *      childAssetId
     *  ]
     * @dev Emits ***ChildAssetEquipped*** event.
     * @param data An `IntakeEquip` struct specifying the equip data
     */
    function _equip(IntakeEquip memory data) internal virtual {
        address catalogAddress = _catalogAddresses[data.assetId];
        uint64 slotPartId = data.slotPartId;
        if (
            _equipments[data.tokenId][catalogAddress][slotPartId]
                .childEquippableAddress != address(0)
        ) revert RMRKSlotAlreadyUsed();

        // Check from parent's asset perspective:
        _checkAssetAcceptsSlot(data.assetId, slotPartId);

        IERC6059.Child memory child = childOf(data.tokenId, data.childIndex);

        // Check from child perspective intention to be used in part
        // We add reentrancy guard because of this call, it happens before updating state
        if (
            !IERC6220(child.contractAddress)
                .canTokenBeEquippedWithAssetIntoSlot(
                    address(this),
                    child.tokenId,
                    data.childAssetId,
                    slotPartId
                )
        ) revert RMRKTokenCannotBeEquippedWithAssetIntoSlot();

        // Check from catalog perspective
        if (
            !IRMRKCatalog(catalogAddress).checkIsEquippable(
                slotPartId,
                child.contractAddress
            )
        ) revert RMRKEquippableEquipNotAllowedByCatalog();

        _beforeEquip(data);
        Equipment memory newEquip = Equipment({
            assetId: data.assetId,
            childAssetId: data.childAssetId,
            childId: child.tokenId,
            childEquippableAddress: child.contractAddress
        });

        _equipments[data.tokenId][catalogAddress][slotPartId] = newEquip;
        _equipCountPerChild[data.tokenId][child.contractAddress][
            child.tokenId
        ] += 1;

        emit ChildAssetEquipped(
            data.tokenId,
            data.assetId,
            slotPartId,
            child.tokenId,
            child.contractAddress,
            data.childAssetId
        );
        _afterEquip(data);
    }

    /**
     * @notice Private function to check if a given asset accepts a given slot or not.
     * @dev Execution will be reverted if the `Slot` does not apply for the asset.
     * @param assetId ID of the asset
     * @param slotPartId ID of the `Slot`
     */
    function _checkAssetAcceptsSlot(
        uint64 assetId,
        uint64 slotPartId
    ) private view {
        (, bool found) = _partIds[assetId].indexOf(slotPartId);
        if (!found) revert RMRKTargetAssetCannotReceiveSlot();
    }

    /**
     * @inheritdoc IERC6220
     */
    function unequip(
        uint256 tokenId,
        uint64 assetId,
        uint64 slotPartId
    ) public virtual onlyApprovedOrOwner(tokenId) {
        _unequip(tokenId, assetId, slotPartId);
    }

    /**
     * @notice Private function used to unequip child from parent token.
     * @dev Emits ***ChildAssetUnequipped*** event.
     * @param tokenId ID of the parent from which the child is being unequipped
     * @param assetId ID of the parent's asset that contains the `Slot` into which the child is equipped
     * @param slotPartId ID of the `Slot` from which to unequip the child
     */
    function _unequip(
        uint256 tokenId,
        uint64 assetId,
        uint64 slotPartId
    ) internal virtual {
        address targetCatalogAddress = _catalogAddresses[assetId];
        Equipment memory equipment = _equipments[tokenId][targetCatalogAddress][
            slotPartId
        ];
        if (equipment.childEquippableAddress == address(0))
            revert RMRKNotEquipped();
        _beforeUnequip(tokenId, assetId, slotPartId);

        delete _equipments[tokenId][targetCatalogAddress][slotPartId];
        _equipCountPerChild[tokenId][equipment.childEquippableAddress][
            equipment.childId
        ] -= 1;

        emit ChildAssetUnequipped(
            tokenId,
            assetId,
            slotPartId,
            equipment.childId,
            equipment.childEquippableAddress,
            equipment.childAssetId
        );
        _afterUnequip(tokenId, assetId, slotPartId);
    }

    /**
     * @inheritdoc IERC6220
     */
    function isChildEquipped(
        uint256 tokenId,
        address childAddress,
        uint256 childId
    ) public view virtual returns (bool) {
        return _equipCountPerChild[tokenId][childAddress][childId] != 0;
    }

    // --------------------- ADMIN VALIDATION ---------------------

    /**
     * @notice Internal function used to declare that the assets belonging to a given `equippableGroupId` are
     *  equippable into the `Slot` associated with the `partId` of the collection at the specified `parentAddress`.
     * @dev Emits ***ValidParentEquippableGroupIdSet*** event.
     * @param equippableGroupId ID of the equippable group
     * @param parentAddress Address of the parent into which the equippable group can be equipped into
     * @param slotPartId ID of the `Slot` that the items belonging to the equippable group can be equipped into
     */
    function _setValidParentForEquippableGroup(
        uint64 equippableGroupId,
        address parentAddress,
        uint64 slotPartId
    ) internal virtual {
        if (equippableGroupId == uint64(0) || slotPartId == uint64(0))
            revert RMRKIdZeroForbidden();
        _validParentSlots[equippableGroupId][parentAddress] = slotPartId;
        emit ValidParentEquippableGroupIdSet(
            equippableGroupId,
            slotPartId,
            parentAddress
        );
    }

    /**
     * @inheritdoc IERC6220
     */
    function canTokenBeEquippedWithAssetIntoSlot(
        address parent,
        uint256 tokenId,
        uint64 assetId,
        uint64 slotId
    ) public view virtual returns (bool) {
        uint64 equippableGroupId = _equippableGroupIds[assetId];
        uint64 equippableSlot = _validParentSlots[equippableGroupId][parent];
        if (equippableSlot == slotId) {
            (, bool found) = getActiveAssets(tokenId).indexOf(assetId);
            return found;
        }
        return false;
    }

    // --------------------- Getting Extended Assets ---------------------

    /**
     * @inheritdoc IERC6220
     */
    function getAssetAndEquippableData(
        uint256 tokenId,
        uint64 assetId
    )
        public
        view
        virtual
        returns (string memory, uint64, address, uint64[] memory)
    {
        return (
            getAssetMetadata(tokenId, assetId),
            _equippableGroupIds[assetId],
            _catalogAddresses[assetId],
            _partIds[assetId]
        );
    }

    ////////////////////////////////////////
    //              UTILS
    ////////////////////////////////////////

    /**
     * @inheritdoc IERC6220
     */
    function getEquipment(
        uint256 tokenId,
        address targetCatalogAddress,
        uint64 slotPartId
    ) public view virtual returns (Equipment memory) {
        return _equipments[tokenId][targetCatalogAddress][slotPartId];
    }

    // HOOKS

    /**
     * @notice A hook to be called before a equipping a asset to the token.
     * @dev The `IntakeEquip` struct consist of the following data:
     *  [
     *      tokenId,
     *      childIndex,
     *      assetId,
     *      slotPartId,
     *      childAssetId
     *  ]
     * @param data The `IntakeEquip` struct containing data of the asset that is being equipped
     */
    function _beforeEquip(IntakeEquip memory data) internal virtual {}

    /**
     * @notice A hook to be called after equipping a asset to the token.
     * @dev The `IntakeEquip` struct consist of the following data:
     *  [
     *      tokenId,
     *      childIndex,
     *      assetId,
     *      slotPartId,
     *      childAssetId
     *  ]
     * @param data The `IntakeEquip` struct containing data of the asset that was equipped
     */
    function _afterEquip(IntakeEquip memory data) internal virtual {}

    /**
     * @notice A hook to be called before unequipping a asset from the token.
     * @param tokenId ID of the token from which the asset is being unequipped
     * @param assetId ID of the asset being unequipped
     * @param slotPartId ID of the slot from which the asset is being unequipped
     */
    function _beforeUnequip(
        uint256 tokenId,
        uint64 assetId,
        uint64 slotPartId
    ) internal virtual {}

    /**
     * @notice A hook to be called after unequipping a asset from the token.
     * @param tokenId ID of the token from which the asset was unequipped
     * @param assetId ID of the asset that was unequipped
     * @param slotPartId ID of the slot from which the asset was unequipped
     */
    function _afterUnequip(
        uint256 tokenId,
        uint64 assetId,
        uint64 slotPartId
    ) internal virtual {}
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/interfaces/IERC2981.sol";
import "../library/RMRKErrors.sol";

/**
 * @title RMRKRoyalties
 * @author RMRK team
 * @notice Smart contract of the RMRK Royalties module.
 */
abstract contract RMRKRoyalties is IERC2981 {
    address private _royaltyRecipient;
    uint256 private _royaltyPercentageBps;

    /**
     * @notice Used to initiate the smart contract.
     * @dev `royaltyPercentageBps` is expressed in basis points, so 1 basis point equals 0.01% and 500 basis points
     *  equal 5%.
     * @param royaltyRecipient Address to which royalties should be sent
     * @param royaltyPercentageBps The royalty percentage expressed in basis points
     */
    constructor(
        address royaltyRecipient,
        uint256 royaltyPercentageBps //in basis points
    ) {
        _setRoyaltyRecipient(royaltyRecipient);
        if (royaltyPercentageBps >= 10000) revert RMRKRoyaltiesTooHigh();
        _royaltyPercentageBps = royaltyPercentageBps;
    }

    /**
     * @notice Used to update recipient of royalties.
     * @dev Custom access control has to be implemented to ensure that only the intended actors can update the
     *  beneficiary.
     * @param newRoyaltyRecipient Address of the new recipient of royalties
     */
    function updateRoyaltyRecipient(
        address newRoyaltyRecipient
    ) external virtual;

    /**
     * @notice Used to update the royalty recipient.
     * @param newRoyaltyRecipient Address of the new recipient of royalties
     */
    function _setRoyaltyRecipient(address newRoyaltyRecipient) internal {
        _royaltyRecipient = newRoyaltyRecipient;
    }

    /**
     * @notice Used to retrieve the recipient of royalties.
     * @return Address of the recipient of royalties
     */
    function getRoyaltyRecipient() public view virtual returns (address) {
        return _royaltyRecipient;
    }

    /**
     * @notice Used to retrieve the specified royalty percentage.
     * @return The royalty percentage expressed in the basis points
     */
    function getRoyaltyPercentage() public view virtual returns (uint256) {
        return _royaltyPercentageBps;
    }

    /**
     * @notice Used to retrieve the information about who shall receive royalties of a sale of the specified token and
     *  how much they will be.
     * @param tokenId ID of the token for which the royalty info is being retrieved
     * @param salePrice Price of the token sale
     * @return receiver The beneficiary receiving royalties of the sale
     * @return royaltyAmount The value of the royalties recieved by the `receiver` from the sale
     */
    function royaltyInfo(
        uint256 tokenId,
        uint256 salePrice
    )
        external
        view
        virtual
        override
        returns (address receiver, uint256 royaltyAmount)
    {
        receiver = _royaltyRecipient;
        royaltyAmount = (salePrice * _royaltyPercentageBps) / 10000;
    }
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

/// @title RMRKErrors
/// @author RMRK team
/// @notice A collection of errors used in the RMRK suite
/// @dev Errors are kept in a centralised file in order to provide a central point of reference and to avoid error
///  naming collisions due to inheritance

/// Attempting to grant the token to 0x0 address
error ERC721AddressZeroIsNotaValidOwner();
/// Attempting to grant approval to the current owner of the token
error ERC721ApprovalToCurrentOwner();
/// Attempting to grant approval when not being owner or approved for all should not be permitted
error ERC721ApproveCallerIsNotOwnerNorApprovedForAll();
/// Attempting to get approvals for a token owned by 0x0 (considered non-existent)
error ERC721ApprovedQueryForNonexistentToken();
/// Attempting to grant approval to self
error ERC721ApproveToCaller();
/// Attempting to use an invalid token ID
error ERC721InvalidTokenId();
/// Attempting to mint to 0x0 address
error ERC721MintToTheZeroAddress();
/// Attempting to manage a token without being its owner or approved by the owner
error ERC721NotApprovedOrOwner();
/// Attempting to mint an already minted token
error ERC721TokenAlreadyMinted();
/// Attempting to transfer the token from an address that is not the owner
error ERC721TransferFromIncorrectOwner();
/// Attempting to safe transfer to an address that is unable to receive the token
error ERC721TransferToNonReceiverImplementer();
/// Attempting to transfer the token to a 0x0 address
error ERC721TransferToTheZeroAddress();
/// Attempting to grant approval of assets to their current owner
error RMRKApprovalForAssetsToCurrentOwner();
/// Attempting to grant approval of assets without being the caller or approved for all
error RMRKApproveForAssetsCallerIsNotOwnerNorApprovedForAll();
/// Attempting to incorrectly configue a Catalog item
error RMRKBadConfig();
/// Attempting to set the priorities with an array of length that doesn't match the length of active assets array
error RMRKBadPriorityListLength();
/// Attempting to add an asset entry with `Part`s, without setting the `Catalog` address
error RMRKCatalogRequiredForParts();
/// Attempting to transfer a soulbound (non-transferrable) token
error RMRKCannotTransferSoulbound();
/// Attempting to accept a child that has already been accepted
error RMRKChildAlreadyExists();
/// Attempting to interact with a child, using index that is higher than the number of children
error RMRKChildIndexOutOfRange();
/// Attempting to find the index of a child token on a parent which does not own it.
error RMRKChildNotFoundInParent();
/// Attempting to pass collaborator address array and collaborator permission array of different lengths
error RMRKCollaboratorArraysNotEqualLength();
/// Attempting to register a collection that is already registered
error RMRKCollectionAlreadyRegistered();
/// Attempting to manage or interact with colleciton that is not registered
error RMRKCollectionNotRegistered();
/// Attempting to equip a `Part` with a child not approved by the Catalog
error RMRKEquippableEquipNotAllowedByCatalog();
/// Attempting to use ID 0, which is not supported
/// @dev The ID 0 in RMRK suite is reserved for empty values. Guarding against its use ensures the expected operation
error RMRKIdZeroForbidden();
/// Attempting to interact with an asset, using index greater than number of assets
error RMRKIndexOutOfRange();
/// Attempting to reclaim a child that can't be reclaimed
error RMRKInvalidChildReclaim();
/// Attempting to interact with an end-user account when the contract account is expected
error RMRKIsNotContract();
/// Attempting to interact with a contract that had its operation locked
error RMRKLocked();
/// Attempting to add a pending child after the number of pending children has reached the limit (default limit is 128)
error RMRKMaxPendingChildrenReached();
/// Attempting to add a pending asset after the number of pending assets has reached the limit (default limit is
///  128)
error RMRKMaxPendingAssetsReached();
/// Attempting to burn a total number of recursive children higher than maximum set
/// @param childContract Address of the collection smart contract in which the maximum number of recursive burns was reached
/// @param childId ID of the child token at which the maximum number of recursive burns was reached
error RMRKMaxRecursiveBurnsReached(address childContract, uint256 childId);
/// Attempting to mint a number of tokens that would cause the total supply to be greater than maximum supply
error RMRKMintOverMax();
/// Attempting to mint a nested token to a smart contract that doesn't support nesting
error RMRKMintToNonRMRKNestableImplementer();
/// Attempting to transfer a child before it is unequipped
error RMRKMustUnequipFirst();
/// Attempting to nest a child over the nestable limit (current limit is 100 levels of nesting)
error RMRKNestableTooDeep();
/// Attempting to nest the token to own descendant, which would create a loop and leave the looped tokens in limbo
error RMRKNestableTransferToDescendant();
/// Attempting to nest the token to a smart contract that doesn't support nesting
error RMRKNestableTransferToNonRMRKNestableImplementer();
/// Attempting to nest the token into itself
error RMRKNestableTransferToSelf();
/// Attempting to interact with an asset that can not be found
error RMRKNoAssetMatchingId();
/// Attempting to manage an asset without owning it or having been granted permission by the owner to do so
error RMRKNotApprovedForAssetsOrOwner();
/// Attempting to interact with a token without being its owner or having been granted permission by the
///  owner to do so
/// @dev When a token is nested, only the direct owner (NFT parent) can mange it. In that case, approved addresses are
///  not allowed to manage it, in order to ensure the expected behaviour
error RMRKNotApprovedOrDirectOwner();
/// Attempting to manage a collection without being the collection's collaborator
error RMRKNotCollectionCollaborator();
/// Attemting to manage a collection without being the collection's issuer
error RMRKNotCollectionIssuer();
/// Attempting to manage a collection without being the collection's issuer or collaborator
error RMRKNotCollectionIssuerOrCollaborator();
/// Attempting to compose an asset wihtout having an associated Catalog
error RMRKNotComposableAsset();
/// Attempting to unequip an item that isn't equipped
error RMRKNotEquipped();
/// Attempting to interact with a management function without being the smart contract's owner
error RMRKNotOwner();
/// Attempting to interact with a function without being the owner or contributor of the collection
error RMRKNotOwnerOrContributor();
/// Attempting to manage a collection without being the specific address
error RMRKNotSpecificAddress();
/// Attempting to manage a token without being its owner
error RMRKNotTokenOwner();
/// Attempting to transfer the ownership to the 0x0 address
error RMRKNewOwnerIsZeroAddress();
/// Attempting to assign a 0x0 address as a contributor
error RMRKNewContributorIsZeroAddress();
/// Attemtping to use `Ownable` interface without implementing it
error RMRKOwnableNotImplemented();
/// Attempting an operation requiring the token being nested, while it is not
error RMRKParentIsNotNFT();
/// Attempting to add a `Part` with an ID that is already used
error RMRKPartAlreadyExists();
/// Attempting to use a `Part` that doesn't exist
error RMRKPartDoesNotExist();
/// Attempting to use a `Part` that is `Fixed` when `Slot` kind of `Part` should be used
error RMRKPartIsNotSlot();
/// Attempting to interact with a pending child using an index greater than the size of pending array
error RMRKPendingChildIndexOutOfRange();
/// Attempting to add an asset using an ID that has already been used
error RMRKAssetAlreadyExists();
/// Attempting to equip an item into a slot that already has an item equipped
error RMRKSlotAlreadyUsed();
/// Attempting to equip an item into a `Slot` that the target asset does not implement
error RMRKTargetAssetCannotReceiveSlot();
/// Attempting to equip a child into a `Slot` and parent that the child's collection doesn't support
error RMRKTokenCannotBeEquippedWithAssetIntoSlot();
/// Attempting to compose a NFT of a token without active assets
error RMRKTokenDoesNotHaveAsset();
/// Attempting to determine the asset with the top priority on a token without assets
error RMRKTokenHasNoAssets();
/// Attempting to accept or transfer a child which does not match the one at the specified index
error RMRKUnexpectedChildId();
/// Attempting to reject all pending assets but more assets than expected are pending
error RMRKUnexpectedNumberOfAssets();
/// Attempting to reject all pending children but children assets than expected are pending
error RMRKUnexpectedNumberOfChildren();
/// Attempting to accept or reject an asset which does not match the one at the specified index
error RMRKUnexpectedAssetId();
/// Attempting an operation expecting a parent to the token which is not the actual one
error RMRKUnexpectedParent();
/// Attempting not to pass an empty array of equippable addresses when adding or setting the equippable addresses
error RMRKZeroLengthIdsPassed();
/// Attempting to set the royalties to a value higher than 100% (10000 in base points)
error RMRKRoyaltiesTooHigh();

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title RMRKLib
 * @author RMRK team
 * @notice RMRK library smart contract.
 */
library RMRKLib {
    /**
     * @notice Used to remove an item from the array using the specified index.
     * @dev The item is removed by replacing it with the last item and removing the last element.
     * @param array An array of items containing the item to be removed
     * @param index Index of the item to remove
     */
    function removeItemByIndex(uint64[] storage array, uint256 index) internal {
        //Check to see if this is already gated by require in all calls
        require(index < array.length);
        array[index] = array[array.length - 1];
        array.pop();
    }

    /**
     * @notice Used to determine the index of the item in the array by spedifying its value.
     * @dev This was adapted from Cryptofin-Solidity `arrayUtils`.
     * @dev If the item is not found the index returned will equal `0`.
     * @param A The array containing the item to be found
     * @param a The value of the item to find the index of
     * @return The index of the item in the array
     * @return A boolean value specifying whether the item was found
     */
    function indexOf(
        uint64[] memory A,
        uint64 a
    ) internal pure returns (uint256, bool) {
        uint256 length = A.length;
        for (uint256 i; i < length; ) {
            if (A[i] == a) {
                return (i, true);
            }
            unchecked {
                ++i;
            }
        }
        return (0, false);
    }
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "./IERC5773.sol";
import "../library/RMRKLib.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "../library/RMRKErrors.sol";

/**
 * @title AbstractMultiAsset
 * @author RMRK team
 * @notice Abstract Smart contract implementing most of the common logic for contracts implementing IERC5773
 */
abstract contract AbstractMultiAsset is Context, IERC5773 {
    using RMRKLib for uint64[];

    /// Mapping of uint64 Ids to asset metadata
    mapping(uint64 => string) private _assets;

    /// Mapping of tokenId to new asset, to asset to be replaced
    mapping(uint256 => mapping(uint64 => uint64)) private _assetReplacements;

    /// Mapping of tokenId to an array of active assets
    /// @dev Active recurses is unbounded, getting all would reach gas limit at around 30k items
    /// so we leave this as internal in case a custom implementation needs to implement pagination
    mapping(uint256 => uint64[]) internal _activeAssets;

    /// Mapping of tokenId to an array of pending assets
    mapping(uint256 => uint64[]) internal _pendingAssets;

    /// Mapping of tokenId to an array of priorities for active assets
    mapping(uint256 => uint64[]) internal _activeAssetPriorities;

    /// Mapping of tokenId to assetId to whether the token has this asset assigned
    mapping(uint256 => mapping(uint64 => bool)) private _tokenAssets;

    /// Mapping from owner to operator approvals for assets
    mapping(address => mapping(address => bool))
        private _operatorApprovalsForAssets;

    /**
     * @inheritdoc IERC5773
     */
    function getAssetMetadata(
        uint256 tokenId,
        uint64 assetId
    ) public view virtual returns (string memory) {
        if (!_tokenAssets[tokenId][assetId]) revert RMRKTokenDoesNotHaveAsset();
        return _assets[assetId];
    }

    /**
     * @inheritdoc IERC5773
     */
    function getActiveAssets(
        uint256 tokenId
    ) public view virtual returns (uint64[] memory) {
        return _activeAssets[tokenId];
    }

    /**
     * @inheritdoc IERC5773
     */
    function getPendingAssets(
        uint256 tokenId
    ) public view virtual returns (uint64[] memory) {
        return _pendingAssets[tokenId];
    }

    /**
     * @inheritdoc IERC5773
     */
    function getActiveAssetPriorities(
        uint256 tokenId
    ) public view virtual returns (uint64[] memory) {
        return _activeAssetPriorities[tokenId];
    }

    /**
     * @inheritdoc IERC5773
     */
    function getAssetReplacements(
        uint256 tokenId,
        uint64 newAssetId
    ) public view virtual returns (uint64) {
        return _assetReplacements[tokenId][newAssetId];
    }

    /**
     * @inheritdoc IERC5773
     */
    function isApprovedForAllForAssets(
        address owner,
        address operator
    ) public view virtual returns (bool) {
        return _operatorApprovalsForAssets[owner][operator];
    }

    /**
     * @inheritdoc IERC5773
     */
    function setApprovalForAllForAssets(
        address operator,
        bool approved
    ) public virtual {
        if (_msgSender() == operator)
            revert RMRKApprovalForAssetsToCurrentOwner();

        _operatorApprovalsForAssets[_msgSender()][operator] = approved;
        emit ApprovalForAllForAssets(_msgSender(), operator, approved);
    }

    /**
     * @notice Used to accept a pending asset.
     * @dev The call is reverted if there is no pending asset at a given index.
     * @dev Emits ***AssetAccepted*** event.
     * @param tokenId ID of the token for which to accept the pending asset
     * @param index Index of the asset in the pending array to accept
     * @param assetId ID of the asset to accept in token's pending array
     */
    function _acceptAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) internal virtual {
        _validatePendingAssetAtIndex(tokenId, index, assetId);
        _beforeAcceptAsset(tokenId, index, assetId);

        uint64 replacesId = _assetReplacements[tokenId][assetId];
        uint256 replaceIndex;
        bool replacefound;
        if (replacesId != uint64(0))
            (replaceIndex, replacefound) = _activeAssets[tokenId].indexOf(
                replacesId
            );

        if (replacefound) {
            // We don't want to remove and then push a new asset.
            // This way we also keep the priority of the original asset
            _activeAssets[tokenId][replaceIndex] = assetId;
            delete _tokenAssets[tokenId][replacesId];
        } else {
            // We use the current size as next priority, by default priorities would be [0,1,2...]
            _activeAssetPriorities[tokenId].push(
                uint64(_activeAssets[tokenId].length)
            );
            _activeAssets[tokenId].push(assetId);
            replacesId = uint64(0);
        }
        _removePendingAsset(tokenId, index, assetId);

        emit AssetAccepted(tokenId, assetId, replacesId);
        _afterAcceptAsset(tokenId, index, assetId);
    }

    /**
     * @notice Used to reject the specified asset from the pending array.
     * @dev The call is reverted if there is no pending asset at a given index.
     * @dev Emits ***AssetRejected*** event.
     * @param tokenId ID of the token that the asset is being rejected from
     * @param index Index of the asset in the pending array to be rejected
     * @param assetId ID of the asset expected to be in the index
     */
    function _rejectAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) internal virtual {
        _validatePendingAssetAtIndex(tokenId, index, assetId);
        _beforeRejectAsset(tokenId, index, assetId);

        _removePendingAsset(tokenId, index, assetId);
        delete _tokenAssets[tokenId][assetId];

        emit AssetRejected(tokenId, assetId);
        _afterRejectAsset(tokenId, index, assetId);
    }

    /**
     * @notice Used to validate the index on the pending assets array
     * @dev The call is reverted if the index is out of range or the asset Id is not present at the index.
     * @param tokenId ID of the token that the asset is validated from
     * @param index Index of the asset in the pending array
     * @param assetId Id of the asset expected to be in the index
     */
    function _validatePendingAssetAtIndex(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) private view {
        if (index >= _pendingAssets[tokenId].length)
            revert RMRKIndexOutOfRange();
        if (assetId != _pendingAssets[tokenId][index])
            revert RMRKUnexpectedAssetId();
    }

    /**
     * @notice Used to remove the asset at the index on the pending assets array
     * @param tokenId ID of the token that the asset is being removed from
     * @param index Index of the asset in the pending array
     * @param assetId Id of the asset expected to be in the index
     */
    function _removePendingAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) private {
        _pendingAssets[tokenId].removeItemByIndex(index);
        delete _assetReplacements[tokenId][assetId];
    }

    /**
     * @notice Used to reject all of the pending assets for the given token.
     * @dev When rejecting all assets, the pending array is indiscriminately cleared.
     * @dev If the number of pending assets is greater than the value of `maxRejections`, the exectuion will be
     *  reverted.
     * @dev Emits ***AssetRejected*** event.
     * @param tokenId ID of the token to reject all of the pending assets.
     * @param maxRejections Maximum number of expected assets to reject, used to prevent from
     *  rejecting assets which arrive just before this operation.
     */
    function _rejectAllAssets(
        uint256 tokenId,
        uint256 maxRejections
    ) internal virtual {
        uint256 len = _pendingAssets[tokenId].length;
        if (len > maxRejections) revert RMRKUnexpectedNumberOfAssets();

        _beforeRejectAllAssets(tokenId);

        for (uint256 i; i < len; ) {
            uint64 assetId = _pendingAssets[tokenId][i];
            delete _assetReplacements[tokenId][assetId];
            unchecked {
                ++i;
            }
        }
        delete (_pendingAssets[tokenId]);

        emit AssetRejected(tokenId, uint64(0));
        _afterRejectAllAssets(tokenId);
    }

    /**
     * @notice Used to specify the priorities for a given token's active assets.
     * @dev If the length of the priorities array doesn't match the length of the active assets array, the execution
     *  will be reverted.
     * @dev The position of the priority value in the array corresponds the position of the asset in the active
     *  assets array it will be applied to.
     * @dev Emits ***AssetPrioritySet*** event.
     * @param tokenId ID of the token for which the priorities are being set
     * @param priorities Array of priorities for the assets
     */
    function _setPriority(
        uint256 tokenId,
        uint64[] calldata priorities
    ) internal virtual {
        uint256 length = priorities.length;
        if (length != _activeAssets[tokenId].length)
            revert RMRKBadPriorityListLength();

        _beforeSetPriority(tokenId, priorities);
        _activeAssetPriorities[tokenId] = priorities;

        emit AssetPrioritySet(tokenId);
        _afterSetPriority(tokenId, priorities);
    }

    /**
     * @notice Used to add an asset entry.
     * @dev If the specified ID is already used by another asset, the execution will be reverted.
     * @dev This internal function warrants custom access control to be implemented when used.
     * @dev Emits ***AssetSet*** event.
     * @param id ID of the asset to assign to the new asset
     * @param metadataURI Metadata URI of the asset
     */
    function _addAssetEntry(
        uint64 id,
        string memory metadataURI
    ) internal virtual {
        if (id == uint64(0)) revert RMRKIdZeroForbidden();
        if (bytes(_assets[id]).length > 0) revert RMRKAssetAlreadyExists();

        _beforeAddAsset(id, metadataURI);
        _assets[id] = metadataURI;

        emit AssetSet(id);
        _afterAddAsset(id, metadataURI);
    }

    /**
     * @notice Used to add an asset to a token.
     * @dev If the given asset is already added to the token, the execution will be reverted.
     * @dev If the asset ID is invalid, the execution will be reverted.
     * @dev If the token already has the maximum amount of pending assets (128), the execution will be
     *  reverted.
     * @dev Emits ***AssetAddedToTokens*** event.
     * @param tokenId ID of the token to add the asset to
     * @param assetId ID of the asset to add to the token
     * @param replacesAssetWithId ID of the asset to replace from the token's list of active assets
     */
    function _addAssetToToken(
        uint256 tokenId,
        uint64 assetId,
        uint64 replacesAssetWithId
    ) internal virtual {
        if (_tokenAssets[tokenId][assetId]) revert RMRKAssetAlreadyExists();

        if (bytes(_assets[assetId]).length == uint256(0))
            revert RMRKNoAssetMatchingId();

        if (_pendingAssets[tokenId].length >= 128)
            revert RMRKMaxPendingAssetsReached();

        _beforeAddAssetToToken(tokenId, assetId, replacesAssetWithId);
        _tokenAssets[tokenId][assetId] = true;
        _pendingAssets[tokenId].push(assetId);

        if (replacesAssetWithId != uint64(0)) {
            _assetReplacements[tokenId][assetId] = replacesAssetWithId;
        }

        uint256[] memory tokenIds = new uint256[](1);
        tokenIds[0] = tokenId;
        emit AssetAddedToTokens(tokenIds, assetId, replacesAssetWithId);
        _afterAddAssetToToken(tokenId, assetId, replacesAssetWithId);
    }

    /**
     * @notice Hook that is called before an asset is added.
     * @param id ID of the asset
     * @param metadataURI Metadata URI of the asset
     */
    function _beforeAddAsset(
        uint64 id,
        string memory metadataURI
    ) internal virtual {}

    /**
     * @notice Hook that is called after an asset is added.
     * @param id ID of the asset
     * @param metadataURI Metadata URI of the asset
     */
    function _afterAddAsset(
        uint64 id,
        string memory metadataURI
    ) internal virtual {}

    /**
     * @notice Hook that is called before adding an asset to a token's pending assets array.
     * @dev If the asset doesn't intend to replace another asset, the `replacesAssetWithId` value should be `0`.
     * @param tokenId ID of the token to which the asset is being added
     * @param assetId ID of the asset that is being added
     * @param replacesAssetWithId ID of the asset that this asset is attempting to replace
     */
    function _beforeAddAssetToToken(
        uint256 tokenId,
        uint64 assetId,
        uint64 replacesAssetWithId
    ) internal virtual {}

    /**
     * @notice Hook that is called after an asset has been added to a token's pending assets array.
     * @dev If the asset doesn't intend to replace another asset, the `replacesAssetWithId` value should be `0`.
     * @param tokenId ID of the token to which the asset is has been added
     * @param assetId ID of the asset that is has been added
     * @param replacesAssetWithId ID of the asset that this asset is attempting to replace
     */
    function _afterAddAssetToToken(
        uint256 tokenId,
        uint64 assetId,
        uint64 replacesAssetWithId
    ) internal virtual {}

    /**
     * @notice Hook that is called before an asset is accepted to a token's active assets array.
     * @param tokenId ID of the token for which the asset is being accepted
     * @param index Index of the asset in the token's pending assets array
     * @param assetId ID of the asset expected to be located at the specified `index`
     */
    function _beforeAcceptAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) internal virtual {}

    /**
     * @notice Hook that is called after an asset is accepted to a token's active assets array.
     * @param tokenId ID of the token for which the asset has been accepted
     * @param index Index of the asset in the token's pending assets array
     * @param assetId ID of the asset expected to have been located at the specified `index`
     */
    function _afterAcceptAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) internal virtual {}

    /**
     * @notice Hook that is called before rejecting an asset.
     * @param tokenId ID of the token from which the asset is being rejected
     * @param index Index of the asset in the token's pending assets array
     * @param assetId ID of the asset expected to be located at the specified `index`
     */
    function _beforeRejectAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) internal virtual {}

    /**
     * @notice Hook that is called after rejecting an asset.
     * @param tokenId ID of the token from which the asset has been rejected
     * @param index Index of the asset in the token's pending assets array
     * @param assetId ID of the asset expected to have been located at the specified `index`
     */
    function _afterRejectAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) internal virtual {}

    /**
     * @notice Hook that is called before rejecting all assets of a token.
     * @param tokenId ID of the token from which all of the assets are being rejected
     */
    function _beforeRejectAllAssets(uint256 tokenId) internal virtual {}

    /**
     * @notice Hook that is called after rejecting all assets of a token.
     * @param tokenId ID of the token from which all of the assets have been rejected
     */
    function _afterRejectAllAssets(uint256 tokenId) internal virtual {}

    /**
     * @notice Hook that is called before the priorities for token's assets is set.
     * @param tokenId ID of the token for which the asset priorities are being set
     * @param priorities[] An array of priorities for token's active resources
     */
    function _beforeSetPriority(
        uint256 tokenId,
        uint64[] calldata priorities
    ) internal virtual {}

    /**
     * @notice Hook that is called after the priorities for token's assets is set.
     * @param tokenId ID of the token for which the asset priorities have been set
     * @param priorities[] An array of priorities for token's active resources
     */
    function _afterSetPriority(
        uint256 tokenId,
        uint64[] calldata priorities
    ) internal virtual {}
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @title IERC5773
 * @author RMRK team
 * @notice Interface smart contract of the RMRK multi asset module.
 */
interface IERC5773 is IERC165 {
    /**
     * @notice Used to notify listeners that an asset object is initialized at `assetId`.
     * @param assetId ID of the asset that was initialized
     */
    event AssetSet(uint64 indexed assetId);

    /**
     * @notice Used to notify listeners that an asset object at `assetId` is added to token's pending asset
     *  array.
     * @param tokenIds An array of token IDs that received a new pending asset
     * @param assetId ID of the asset that has been added to the token's pending assets array
     * @param replacesId ID of the asset that would be replaced
     */
    event AssetAddedToTokens(
        uint256[] tokenIds,
        uint64 indexed assetId,
        uint64 indexed replacesId
    );

    /**
     * @notice Used to notify listeners that an asset object at `assetId` is accepted by the token and migrated
     *  from token's pending assets array to active assets array of the token.
     * @param tokenId ID of the token that had a new asset accepted
     * @param assetId ID of the asset that was accepted
     * @param replacesId ID of the asset that was replaced
     */
    event AssetAccepted(
        uint256 indexed tokenId,
        uint64 indexed assetId,
        uint64 indexed replacesId
    );

    /**
     * @notice Used to notify listeners that an asset object at `assetId` is rejected from token and is dropped
     *  from the pending assets array of the token.
     * @param tokenId ID of the token that had an asset rejected
     * @param assetId ID of the asset that was rejected
     */
    event AssetRejected(uint256 indexed tokenId, uint64 indexed assetId);

    /**
     * @notice Used to notify listeners that token's prioritiy array is reordered.
     * @param tokenId ID of the token that had the asset priority array updated
     */
    event AssetPrioritySet(uint256 indexed tokenId);

    /**
     * @notice Used to notify listeners that owner has granted an approval to the user to manage the assets of a
     *  given token.
     * @dev Approvals must be cleared on transfer
     * @param owner Address of the account that has granted the approval for all token's assets
     * @param approved Address of the account that has been granted approval to manage the token's assets
     * @param tokenId ID of the token on which the approval was granted
     */
    event ApprovalForAssets(
        address indexed owner,
        address indexed approved,
        uint256 indexed tokenId
    );

    /**
     * @notice Used to notify listeners that owner has granted approval to the user to manage assets of all of their
     *  tokens.
     * @param owner Address of the account that has granted the approval for all assets on all of their tokens
     * @param operator Address of the account that has been granted the approval to manage the token's assets on all of
     *  the tokens
     * @param approved Boolean value signifying whether the permission has been granted (`true`) or revoked (`false`)
     */
    event ApprovalForAllForAssets(
        address indexed owner,
        address indexed operator,
        bool approved
    );

    /**
     * @notice Accepts an asset at from the pending array of given token.
     * @dev Migrates the asset from the token's pending asset array to the token's active asset array.
     * @dev Active assets cannot be removed by anyone, but can be replaced by a new asset.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     *  - `index` must be in range of the length of the pending asset array.
     * @dev Emits an {AssetAccepted} event.
     * @param tokenId ID of the token for which to accept the pending asset
     * @param index Index of the asset in the pending array to accept
     * @param assetId ID of the asset expected to be in the index
     */
    function acceptAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) external;

    /**
     * @notice Rejects an asset from the pending array of given token.
     * @dev Removes the asset from the token's pending asset array.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     *  - `index` must be in range of the length of the pending asset array.
     * @dev Emits a {AssetRejected} event.
     * @param tokenId ID of the token that the asset is being rejected from
     * @param index Index of the asset in the pending array to be rejected
     * @param assetId ID of the asset expected to be in the index
     */
    function rejectAsset(
        uint256 tokenId,
        uint256 index,
        uint64 assetId
    ) external;

    /**
     * @notice Rejects all assets from the pending array of a given token.
     * @dev Effecitvely deletes the pending array.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     * @dev Emits a {AssetRejected} event with assetId = 0.
     * @param tokenId ID of the token of which to clear the pending array.
     * @param maxRejections Maximum number of expected assets to reject, used to prevent from rejecting assets which
     *  arrive just before this operation.
     */
    function rejectAllAssets(uint256 tokenId, uint256 maxRejections) external;

    /**
     * @notice Sets a new priority array for a given token.
     * @dev The priority array is a non-sequential list of `uint64`s, where the lowest value is considered highest
     *  priority.
     * @dev Value `0` of a priority is a special case equivalent to unitialized.
     * @dev Requirements:
     *
     *  - The caller must own the token or be approved to manage the token's assets
     *  - `tokenId` must exist.
     *  - The length of `priorities` must be equal the length of the active assets array.
     * @dev Emits a {AssetPrioritySet} event.
     * @param tokenId ID of the token to set the priorities for
     * @param priorities An array of priorities of active assets. The succesion of items in the priorities array
     *  matches that of the succesion of items in the active array
     */
    function setPriority(
        uint256 tokenId,
        uint64[] calldata priorities
    ) external;

    /**
     * @notice Used to retrieve IDs of the active assets of given token.
     * @dev Asset data is stored by reference, in order to access the data corresponding to the ID, call
     *  `getAssetMetadata(tokenId, assetId)`.
     * @dev You can safely get 10k
     * @param tokenId ID of the token to retrieve the IDs of the active assets
     * @return An array of active asset IDs of the given token
     */
    function getActiveAssets(
        uint256 tokenId
    ) external view returns (uint64[] memory);

    /**
     * @notice Used to retrieve IDs of the pending assets of given token.
     * @dev Asset data is stored by reference, in order to access the data corresponding to the ID, call
     *  `getAssetMetadata(tokenId, assetId)`.
     * @param tokenId ID of the token to retrieve the IDs of the pending assets
     * @return An array of pending asset IDs of the given token
     */
    function getPendingAssets(
        uint256 tokenId
    ) external view returns (uint64[] memory);

    /**
     * @notice Used to retrieve the priorities of the active resoources of a given token.
     * @dev Asset priorities are a non-sequential array of uint64 values with an array size equal to active asset
     *  priorites.
     * @param tokenId ID of the token for which to retrieve the priorities of the active assets
     * @return An array of priorities of the active assets of the given token
     */
    function getActiveAssetPriorities(
        uint256 tokenId
    ) external view returns (uint64[] memory);

    /**
     * @notice Used to retrieve the asset that will be replaced if a given asset from the token's pending array
     *  is accepted.
     * @dev Asset data is stored by reference, in order to access the data corresponding to the ID, call
     *  `getAssetMetadata(tokenId, assetId)`.
     * @param tokenId ID of the token to check
     * @param newAssetId ID of the pending asset which will be accepted
     * @return ID of the asset which will be replaced
     */
    function getAssetReplacements(
        uint256 tokenId,
        uint64 newAssetId
    ) external view returns (uint64);

    /**
     * @notice Used to fetch the asset metadata of the specified token's active asset with the given index.
     * @dev Assets are stored by reference mapping `_assets[assetId]`.
     * @dev Can be overriden to implement enumerate, fallback or other custom logic.
     * @param tokenId ID of the token from which to retrieve the asset metadata
     * @param assetId Asset Id, must be in the active assets array
     * @return The metadata of the asset belonging to the specified index in the token's active assets
     *  array
     */
    function getAssetMetadata(
        uint256 tokenId,
        uint64 assetId
    ) external view returns (string memory);

    // Approvals

    /**
     * @notice Used to grant permission to the user to manage token's assets.
     * @dev This differs from transfer approvals, as approvals are not cleared when the approved party accepts or
     *  rejects an asset, or sets asset priorities. This approval is cleared on token transfer.
     * @dev Only a single account can be approved at a time, so approving the `0x0` address clears previous approvals.
     * @dev Requirements:
     *
     *  - The caller must own the token or be an approved operator.
     *  - `tokenId` must exist.
     * @dev Emits an {ApprovalForAssets} event.
     * @param to Address of the account to grant the approval to
     * @param tokenId ID of the token for which the approval to manage the assets is granted
     */
    function approveForAssets(address to, uint256 tokenId) external;

    /**
     * @notice Used to retrieve the address of the account approved to manage assets of a given token.
     * @dev Requirements:
     *
     *  - `tokenId` must exist.
     * @param tokenId ID of the token for which to retrieve the approved address
     * @return Address of the account that is approved to manage the specified token's assets
     */
    function getApprovedForAssets(
        uint256 tokenId
    ) external view returns (address);

    /**
     * @notice Used to add or remove an operator of assets for the caller.
     * @dev Operators can call {acceptAsset}, {rejectAsset}, {rejectAllAssets} or {setPriority} for any token
     *  owned by the caller.
     * @dev Requirements:
     *
     *  - The `operator` cannot be the caller.
     * @dev Emits an {ApprovalForAllForAssets} event.
     * @param operator Address of the account to which the operator role is granted or revoked from
     * @param approved The boolean value indicating whether the operator role is being granted (`true`) or revoked
     *  (`false`)
     */
    function setApprovalForAllForAssets(
        address operator,
        bool approved
    ) external;

    /**
     * @notice Used to check whether the address has been granted the operator role by a given address or not.
     * @dev See {setApprovalForAllForAssets}.
     * @param owner Address of the account that we are checking for whether it has granted the operator role
     * @param operator Address of the account that we are checking whether it has the operator role or not
     * @return A boolean value indicating wehter the account we are checking has been granted the operator role
     */
    function isApprovedForAllForAssets(
        address owner,
        address operator
    ) external view returns (bool);
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @title IERC6059
 * @author RMRK team
 * @notice Interface smart contract of the RMRK nestable module.
 */
interface IERC6059 is IERC165 {
    /**
     * @notice The core struct of RMRK ownership.
     * @dev The `DirectOwner` struct is used to store information of the next immediate owner, be it the parent token or
     *  the externally owned account.
     * @dev If the token is owned by the externally owned account, the `tokenId` should equal `0`.
     * @param tokenId ID of the parent token
     * @param ownerAddress Address of the owner of the token. If the owner is another token, then the address should be
     *  the one of the parent token's collection smart contract. If the owner is externally owned account, the address
     *  should be the address of this account
     * @param isNft A boolean value signifying whether the token is owned by another token (`true`) or by an externally
     *  owned account (`false`)
     */
    struct DirectOwner {
        uint256 tokenId;
        address ownerAddress;
    }

    /**
     * @notice Used to notify listeners that the token is being transferred.
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     * @param from Address of the previous immediate owner, which is a smart contract if the token was nested.
     * @param to Address of the new immediate owner, which is a smart contract if the token is being nested.
     * @param fromTokenId ID of the previous parent token. If the token was not nested before, the value should be `0`
     * @param toTokenId ID of the new parent token. If the token is not being nested, the value should be `0`
     * @param tokenId ID of the token being transferred
     */
    event NestTransfer(
        address indexed from,
        address indexed to,
        uint256 fromTokenId,
        uint256 toTokenId,
        uint256 indexed tokenId
    );

    /**
     * @notice Used to notify listeners that a new token has been added to a given token's pending children array.
     * @dev Emitted when a child NFT is added to a token's pending array.
     * @param tokenId ID of the token that received a new pending child token
     * @param childIndex Index of the proposed child token in the parent token's pending children array
     * @param childAddress Address of the proposed child token's collection smart contract
     * @param childId ID of the child token in the child token's collection smart contract
     */
    event ChildProposed(
        uint256 indexed tokenId,
        uint256 childIndex,
        address indexed childAddress,
        uint256 indexed childId
    );

    /**
     * @notice Used to notify listeners that a new child token was accepted by the parent token.
     * @dev Emitted when a parent token accepts a token from its pending array, migrating it to the active array.
     * @param tokenId ID of the token that accepted a new child token
     * @param childIndex Index of the newly accepted child token in the parent token's active children array
     * @param childAddress Address of the child token's collection smart contract
     * @param childId ID of the child token in the child token's collection smart contract
     */
    event ChildAccepted(
        uint256 indexed tokenId,
        uint256 childIndex,
        address indexed childAddress,
        uint256 indexed childId
    );

    /**
     * @notice Used to notify listeners that all pending child tokens of a given token have been rejected.
     * @dev Emitted when a token removes all a child tokens from its pending array.
     * @param tokenId ID of the token that rejected all of the pending children
     */
    event AllChildrenRejected(uint256 indexed tokenId);

    /**
     * @notice Used to notify listeners a child token has been transferred from parent token.
     * @dev Emitted when a token transfers a child from itself, transferring ownership to the root owner.
     * @param tokenId ID of the token that transferred a child token
     * @param childIndex Index of a child in the array from which it is being transferred
     * @param childAddress Address of the child token's collection smart contract
     * @param childId ID of the child token in the child token's collection smart contract
     * @param fromPending A boolean value signifying whether the token was in the pending child tokens array (`true`) or
     *  in the active child tokens array (`false`)
     * @param toZero A boolean value signifying whether the token is being transferred to the `0x0` address (`true`) or
     *  not (`false`)
     */
    event ChildTransferred(
        uint256 indexed tokenId,
        uint256 childIndex,
        address indexed childAddress,
        uint256 indexed childId,
        bool fromPending,
        bool toZero
    );

    /**
     * @notice The core child token struct, holding the information about the child tokens.
     * @return tokenId ID of the child token in the child token's collection smart contract
     * @return contractAddress Address of the child token's smart contract
     */
    struct Child {
        uint256 tokenId;
        address contractAddress;
    }

    /**
     * @notice Used to retrieve the *root* owner of a given token.
     * @dev The *root* owner of the token is an externally owned account (EOA). If the given token is child of another
     *  NFT, this will return an EOA address. Otherwise, if the token is owned by an EOA, this EOA wil be returned.
     * @param tokenId ID of the token for which the *root* owner has been retrieved
     * @return owner The *root* owner of the token
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @notice Used to retrieve the immediate owner of the given token.
     * @dev If the immediate owner is another token, the address returned, should be the one of the parent token's
     *  collection smart contract.
     * @param tokenId ID of the token for which the RMRK owner is being retrieved
     * @return Address of the given token's owner
     * @return The ID of the parent token. Should be `0` if the owner is an externally owned account
     * @return The boolean value signifying whether the owner is an NFT or not
     */
    function directOwnerOf(
        uint256 tokenId
    ) external view returns (address, uint256, bool);

    /**
     * @notice Used to burn a given token.
     * @dev When a token is burned, all of its child tokens are recursively burned as well.
     * @dev When specifying the maximum recursive burns, the execution will be reverted if there are more children to be
     *  burned.
     * @dev Setting the `maxRecursiveBurn` value to 0 will only attempt to burn the specified token and revert if there
     *  are any child tokens present.
     * @dev The approvals are cleared when the token is burned.
     * @dev Requirements:
     *
     *  - `tokenId` must exist.
     * @dev Emits a {Transfer} event.
     * @param tokenId ID of the token to burn
     * @param maxRecursiveBurns Maximum number of tokens to recursively burn
     * @return Number of recursively burned children
     */
    function burn(
        uint256 tokenId,
        uint256 maxRecursiveBurns
    ) external returns (uint256);

    /**
     * @notice Used to add a child token to a given parent token.
     * @dev This adds the child token into the given parent token's pending child tokens array.
     * @dev Requirements:
     *
     *  - `directOwnerOf` on the child contract must resolve to the called contract.
     *  - the pending array of the parent contract must not be full.
     * @param parentId ID of the parent token to receive the new child token
     * @param childId ID of the new proposed child token
     * @param data Additional data with no specified format
     */
    function addChild(
        uint256 parentId,
        uint256 childId,
        bytes memory data
    ) external;

    /**
     * @notice Used to accept a pending child token for a given parent token.
     * @dev This moves the child token from parent token's pending child tokens array into the active child tokens
     *  array.
     * @param parentId ID of the parent token for which the child token is being accepted
     * @param childIndex Index of a child tokem in the given parent's pending children array
     * @param childAddress Address of the collection smart contract of the child token expected to be located at the
     *  specified index of the given parent token's pending children array
     * @param childId ID of the child token expected to be located at the specified index of the given parent token's
     *  pending children array
     */
    function acceptChild(
        uint256 parentId,
        uint256 childIndex,
        address childAddress,
        uint256 childId
    ) external;

    /**
     * @notice Used to reject all pending children of a given parent token.
     * @dev Removes the children from the pending array mapping.
     * @dev This does not update the ownership storage data on children. If necessary, ownership can be reclaimed by the
     *  rootOwner of the previous parent.
     * @dev Requirements:
     *
     * Requirements:
     *
     * - `parentId` must exist
     * @param parentId ID of the parent token for which to reject all of the pending tokens.
     * @param maxRejections Maximum number of expected children to reject, used to prevent from rejecting children which
     *  arrive just before this operation.
     */
    function rejectAllChildren(
        uint256 parentId,
        uint256 maxRejections
    ) external;

    /**
     * @notice Used to transfer a child token from a given parent token.
     * @dev When transferring a child token, the owner of the token is set to `to`, or is not updated in the event of
     *  `to` being the `0x0` address.
     * @param tokenId ID of the parent token from which the child token is being transferred
     * @param to Address to which to transfer the token to
     * @param destinationId ID of the token to receive this child token (MUST be 0 if the destination is not a token)
     * @param childIndex Index of a token we are transferring, in the array it belongs to (can be either active array or
     *  pending array)
     * @param childAddress Address of the child token's collection smart contract.
     * @param childId ID of the child token in its own collection smart contract.
     * @param isPending A boolean value indicating whether the child token being transferred is in the pending array of
     *  the parent token (`true`) or in the active array (`false`)
     * @param data Additional data with no specified format, sent in call to `_to`
     */
    function transferChild(
        uint256 tokenId,
        address to,
        uint256 destinationId,
        uint256 childIndex,
        address childAddress,
        uint256 childId,
        bool isPending,
        bytes memory data
    ) external;

    /**
     * @notice Used to retrieve the active child tokens of a given parent token.
     * @dev Returns array of Child structs existing for parent token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @param parentId ID of the parent token for which to retrieve the active child tokens
     * @return An array of Child structs containing the parent token's active child tokens
     */
    function childrenOf(
        uint256 parentId
    ) external view returns (Child[] memory);

    /**
     * @notice Used to retrieve the pending child tokens of a given parent token.
     * @dev Returns array of pending Child structs existing for given parent.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @param parentId ID of the parent token for which to retrieve the pending child tokens
     * @return An array of Child structs containing the parent token's pending child tokens
     */
    function pendingChildrenOf(
        uint256 parentId
    ) external view returns (Child[] memory);

    /**
     * @notice Used to retrieve a specific active child token for a given parent token.
     * @dev Returns a single Child struct locating at `index` of parent token's active child tokens array.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @param parentId ID of the parent token for which the child is being retrieved
     * @param index Index of the child token in the parent token's active child tokens array
     * @return A Child struct containing data about the specified child
     */
    function childOf(
        uint256 parentId,
        uint256 index
    ) external view returns (Child memory);

    /**
     * @notice Used to retrieve a specific pending child token from a given parent token.
     * @dev Returns a single Child struct locating at `index` of parent token's active child tokens array.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @param parentId ID of the parent token for which the pending child token is being retrieved
     * @param index Index of the child token in the parent token's pending child tokens array
     * @return A Child struct containting data about the specified child
     */
    function pendingChildOf(
        uint256 parentId,
        uint256 index
    ) external view returns (Child memory);

    /**
     * @notice Used to transfer the token into another token.
     * @param from Address of the direct owner of the token to be transferred
     * @param to Address of the receiving token's collection smart contract
     * @param tokenId ID of the token being transferred
     * @param destinationId ID of the token to receive the token being transferred
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function nestTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        uint256 destinationId,
        bytes memory data
    ) external;
}

// SPDX-License-Identifier: Apache-2.0

//Generally all interactions should propagate downstream

pragma solidity ^0.8.18;

import "./IERC6059.sol";
import "../core/RMRKCore.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "../library/RMRKErrors.sol";

/**
 * @title RMRKNestable
 * @author RMRK team
 * @notice Smart contract of the RMRK Nestable module.
 * @dev This contract is hierarchy agnostic and can support an arbitrary number of nested levels up and down, as long as
 *  gas limits allow it.
 */
contract RMRKNestable is Context, IERC165, IERC721, IERC6059, RMRKCore {
    using Address for address;

    uint256 private constant _MAX_LEVELS_TO_CHECK_FOR_INHERITANCE_LOOP = 100;

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

    // Mapping from token ID to approver address to approved address
    // The approver is necessary so approvals are invalidated for nested children on transfer
    // WARNING: If a child NFT returns to a previous root owner, old permissions would be active again
    mapping(uint256 => mapping(address => address)) private _tokenApprovals;

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

    // ------------------- NESTABLE --------------

    // Mapping from token ID to DirectOwner struct
    mapping(uint256 => DirectOwner) private _RMRKOwners;

    // Mapping of tokenId to array of active children structs
    mapping(uint256 => Child[]) internal _activeChildren;

    // Mapping of tokenId to array of pending children structs
    mapping(uint256 => Child[]) internal _pendingChildren;

    // Mapping of child token address to child token ID to whether they are pending or active on any token
    // We might have a first extra mapping from token ID, but since the same child cannot be nested into multiple tokens
    //  we can strip it for size/gas savings.
    mapping(address => mapping(uint256 => uint256)) internal _childIsInActive;

    // -------------------------- MODIFIERS ----------------------------

    /**
     * @notice Used to verify that the caller is either the owner of the token or approved to manage it by its owner.
     * @dev If the caller is not the owner of the token or approved to manage it by its owner, the execution will be
     *  reverted.
     * @param tokenId ID of the token to check
     */
    function _onlyApprovedOrOwner(uint256 tokenId) private view {
        if (!_isApprovedOrOwner(_msgSender(), tokenId))
            revert ERC721NotApprovedOrOwner();
    }

    /**
     * @notice Used to verify that the caller is either the owner of the token or approved to manage it by its owner.
     * @param tokenId ID of the token to check
     */
    modifier onlyApprovedOrOwner(uint256 tokenId) {
        _onlyApprovedOrOwner(tokenId);
        _;
    }

    /**
     * @notice Used to verify that the caller is approved to manage the given token or it its direct owner.
     * @dev This does not delegate to ownerOf, which returns the root owner, but rater uses an owner from DirectOwner
     *  struct.
     * @dev The execution is reverted if the caller is not immediate owner or approved to manage the given token.
     * @dev Used for parent-scoped transfers.
     * @param tokenId ID of the token to check.
     */
    function _onlyApprovedOrDirectOwner(uint256 tokenId) private view {
        if (!_isApprovedOrDirectOwner(_msgSender(), tokenId))
            revert RMRKNotApprovedOrDirectOwner();
    }

    /**
     * @notice Used to verify that the caller is approved to manage the given token or is its direct owner.
     * @param tokenId ID of the token to check
     */
    modifier onlyApprovedOrDirectOwner(uint256 tokenId) {
        _onlyApprovedOrDirectOwner(tokenId);
        _;
    }

    // ----------------------------- CONSTRUCTOR ------------------------------

    /**
     * @notice Initializes the contract by setting a `name` and a `symbol` to the token collection.
     * @param name_ Name of the token collection
     * @param symbol_ Symbol of the token collection
     */
    constructor(
        string memory name_,
        string memory symbol_
    ) RMRKCore(name_, symbol_) {}

    // ------------------------------- ERC721 ---------------------------------
    /**
     * @inheritdoc IERC165
     */
    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual returns (bool) {
        return
            interfaceId == type(IERC165).interfaceId ||
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            interfaceId == type(IERC6059).interfaceId;
    }

    /**
     * @notice Used to retrieve the number of tokens in `owner`'s account.
     * @param owner Address of the account being checked
     * @return The balance of the given account
     */
    function balanceOf(address owner) public view virtual returns (uint256) {
        if (owner == address(0)) revert ERC721AddressZeroIsNotaValidOwner();
        return _balances[owner];
    }

    ////////////////////////////////////////
    //              TRANSFERS
    ////////////////////////////////////////

    /**
     * @notice Transfers a given token from `from` to `to`.
     * @dev 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}.
     * @dev Emits a {Transfer} event.
     * @param from Address from which to transfer the token from
     * @param to Address to which to transfer the token to
     * @param tokenId ID of the token to transfer
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual onlyApprovedOrDirectOwner(tokenId) {
        _transfer(from, to, tokenId, "");
    }

    /**
     * @notice Used to safely transfer a given token token from `from` to `to`.
     * @dev 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.
     * @dev Emits a {Transfer} event.
     * @param from Address to transfer the tokens from
     * @param to Address to transfer the tokens to
     * @param tokenId ID of the token to transfer
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @notice Used to safely transfer a given token token from `from` to `to`.
     * @dev 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.
     * @dev Emits a {Transfer} event.
     * @param from Address to transfer the tokens from
     * @param to Address to transfer the tokens to
     * @param tokenId ID of the token to transfer
     * @param data Additional data without a specified format to be sent along with the token transaction
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual onlyApprovedOrDirectOwner(tokenId) {
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @inheritdoc IERC6059
     */
    function nestTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        uint256 destinationId,
        bytes memory data
    ) public virtual onlyApprovedOrDirectOwner(tokenId) {
        _nestTransfer(from, to, tokenId, destinationId, data);
    }

    /**
     * @notice Used to safely transfer the token form `from` to `to`.
     * @dev The function checks that contract recipients are aware of the ERC721 protocol to prevent tokens from being
     *  forever locked.
     * @dev This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. implement alternative
     *  mechanisms to perform token transfer, such as signature-based.
     * @dev Requirements:
     *
     *  - `from` cannot be the zero address.
     *  - `to` cannot be the zero address.
     *  - `tokenId` token must exist and be owned by `from`.
     *  - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     * @dev Emits a {Transfer} event.
     * @param from Address of the account currently owning the given token
     * @param to Address to transfer the token to
     * @param tokenId ID of the token to transfer
     * @param data Additional data with no specified format, sent in call to `to`
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId, data);
        if (!_checkOnERC721Received(from, to, tokenId, data))
            revert ERC721TransferToNonReceiverImplementer();
    }

    /**
     * @notice Used to transfer the token from `from` to `to`.
     * @dev As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     * @dev Requirements:
     *
     *  - `to` cannot be the zero address.
     *  - `tokenId` token must be owned by `from`.
     * @dev Emits a {Transfer} event.
     * @param from Address of the account currently owning the given token
     * @param to Address to transfer the token to
     * @param tokenId ID of the token to transfer
     * @param data Additional data with no specified format, sent in call to `to`
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        (address immediateOwner, uint256 parentId, ) = directOwnerOf(tokenId);
        if (immediateOwner != from) revert ERC721TransferFromIncorrectOwner();
        if (to == address(0)) revert ERC721TransferToTheZeroAddress();

        _beforeTokenTransfer(from, to, tokenId);
        _beforeNestedTokenTransfer(
            immediateOwner,
            to,
            parentId,
            0,
            tokenId,
            data
        );

        _balances[from] -= 1;
        _updateOwnerAndClearApprovals(tokenId, 0, to);
        _balances[to] += 1;

        emit Transfer(from, to, tokenId);
        emit NestTransfer(immediateOwner, to, parentId, 0, tokenId);

        _afterTokenTransfer(from, to, tokenId);
        _afterNestedTokenTransfer(
            immediateOwner,
            to,
            parentId,
            0,
            tokenId,
            data
        );
    }

    /**
     * @notice Used to transfer a token into another token.
     * @dev Attempting to nest a token into `0x0` address will result in reverted transaction.
     * @dev Attempting to nest a token into itself will result in reverted transaction.
     * @param from Address of the account currently owning the given token
     * @param to Address of the receiving token's collection smart contract
     * @param tokenId ID of the token to transfer
     * @param destinationId ID of the token receiving the given token
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _nestTransfer(
        address from,
        address to,
        uint256 tokenId,
        uint256 destinationId,
        bytes memory data
    ) internal virtual {
        (address immediateOwner, uint256 parentId, ) = directOwnerOf(tokenId);
        if (immediateOwner != from) revert ERC721TransferFromIncorrectOwner();
        if (to == address(0)) revert ERC721TransferToTheZeroAddress();
        if (to == address(this) && tokenId == destinationId)
            revert RMRKNestableTransferToSelf();

        // Destination contract checks:
        // It seems redundant, but otherwise it would revert with no error
        if (!to.isContract()) revert RMRKIsNotContract();
        if (!IERC165(to).supportsInterface(type(IERC6059).interfaceId))
            revert RMRKNestableTransferToNonRMRKNestableImplementer();
        _checkForInheritanceLoop(tokenId, to, destinationId);

        _beforeTokenTransfer(from, to, tokenId);
        _beforeNestedTokenTransfer(
            immediateOwner,
            to,
            parentId,
            destinationId,
            tokenId,
            data
        );
        _balances[from] -= 1;
        _updateOwnerAndClearApprovals(tokenId, destinationId, to);
        _balances[to] += 1;

        // Sending to NFT:
        _sendToNFT(immediateOwner, to, parentId, destinationId, tokenId, data);
    }

    /**
     * @notice Used to send a token to another token.
     * @dev If the token being sent is currently owned by an externally owned account, the `parentId` should equal `0`.
     * @dev Emits {Transfer} event.
     * @dev Emits {NestTransfer} event.
     * @param from Address from which the token is being sent
     * @param to Address of the collection smart contract of the token to receive the given token
     * @param parentId ID of the current parent token of the token being sent
     * @param destinationId ID of the tokento receive the token being sent
     * @param tokenId ID of the token being sent
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _sendToNFT(
        address from,
        address to,
        uint256 parentId,
        uint256 destinationId,
        uint256 tokenId,
        bytes memory data
    ) private {
        IERC6059 destContract = IERC6059(to);
        destContract.addChild(destinationId, tokenId, data);

        emit Transfer(from, to, tokenId);
        emit NestTransfer(from, to, parentId, destinationId, tokenId);

        _afterTokenTransfer(from, to, tokenId);
        _afterNestedTokenTransfer(
            from,
            to,
            parentId,
            destinationId,
            tokenId,
            data
        );
    }

    /**
     * @notice Used to check if nesting a given token into a specified token would create an inheritance loop.
     * @dev If a loop would occur, the tokens would be unmanageable, so the execution is reverted if one is detected.
     * @dev The check for inheritance loop is bounded to guard against too much gas being consumed.
     * @param currentId ID of the token that would be nested
     * @param targetContract Address of the collection smart contract of the token into which the given token would be
     *  nested
     * @param targetId ID of the token into which the given token would be nested
     */
    function _checkForInheritanceLoop(
        uint256 currentId,
        address targetContract,
        uint256 targetId
    ) private view {
        for (uint256 i; i < _MAX_LEVELS_TO_CHECK_FOR_INHERITANCE_LOOP; ) {
            (
                address nextOwner,
                uint256 nextOwnerTokenId,
                bool isNft
            ) = IERC6059(targetContract).directOwnerOf(targetId);
            // If there's a final address, we're good. There's no loop.
            if (!isNft) {
                return;
            }
            // Ff the current nft is an ancestor at some point, there is an inheritance loop
            if (nextOwner == address(this) && nextOwnerTokenId == currentId) {
                revert RMRKNestableTransferToDescendant();
            }
            // We reuse the parameters to save some contract size
            targetContract = nextOwner;
            targetId = nextOwnerTokenId;
            unchecked {
                ++i;
            }
        }
        revert RMRKNestableTooDeep();
    }

    ////////////////////////////////////////
    //              MINTING
    ////////////////////////////////////////

    /**
     * @notice Used to safely mint the token to the specified address while passing the additional data to contract
     *  recipients.
     * @param to Address to which to mint the token
     * @param tokenId ID of the token to mint
     * @param data Additional data to send with the tokens
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId, data);
        if (!_checkOnERC721Received(address(0), to, tokenId, data))
            revert ERC721TransferToNonReceiverImplementer();
    }

    /**
     * @notice Used to mint a specified token to a given address.
     * @dev WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible.
     * @dev Requirements:
     *
     *  - `tokenId` must not exist.
     *  - `to` cannot be the zero address.
     * @dev Emits a {Transfer} event.
     * @dev Emits a {NestTransfer} event.
     * @param to Address to mint the token to
     * @param tokenId ID of the token to mint
     * @param data Additional data with no specified format, sent in call to `to`
     */
    function _mint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _innerMint(to, tokenId, 0, data);

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

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

    /**
     * @notice Used to mint a child token to a given parent token.
     * @param to Address of the collection smart contract of the token into which to mint the child token
     * @param tokenId ID of the token to mint
     * @param destinationId ID of the token into which to mint the new child token
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _nestMint(
        address to,
        uint256 tokenId,
        uint256 destinationId,
        bytes memory data
    ) internal virtual {
        // It seems redundant, but otherwise it would revert with no error
        if (!to.isContract()) revert RMRKIsNotContract();
        if (!IERC165(to).supportsInterface(type(IERC6059).interfaceId))
            revert RMRKMintToNonRMRKNestableImplementer();

        _innerMint(to, tokenId, destinationId, data);
        _sendToNFT(address(0), to, 0, destinationId, tokenId, data);
    }

    /**
     * @notice Used to mint a child token into a given parent token.
     * @dev Requirements:
     *
     *  - `to` cannot be the zero address.
     *  - `tokenId` must not exist.
     *  - `tokenId` must not be `0`.
     * @param to Address of the collection smart contract of the token into which to mint the child token
     * @param tokenId ID of the token to mint
     * @param destinationId ID of the token into which to mint the new token
     * @param data Additional data with no specified format, sent in call to `to`
     */
    function _innerMint(
        address to,
        uint256 tokenId,
        uint256 destinationId,
        bytes memory data
    ) private {
        if (to == address(0)) revert ERC721MintToTheZeroAddress();
        if (_exists(tokenId)) revert ERC721TokenAlreadyMinted();
        if (tokenId == uint256(0)) revert RMRKIdZeroForbidden();

        _beforeTokenTransfer(address(0), to, tokenId);
        _beforeNestedTokenTransfer(
            address(0),
            to,
            0,
            destinationId,
            tokenId,
            data
        );

        _balances[to] += 1;
        _RMRKOwners[tokenId] = DirectOwner({
            ownerAddress: to,
            tokenId: destinationId
        });
    }

    ////////////////////////////////////////
    //              Ownership
    ////////////////////////////////////////

    /**
     * @inheritdoc IERC6059
     */
    function ownerOf(
        uint256 tokenId
    ) public view virtual override(IERC6059, IERC721) returns (address) {
        (address owner, uint256 ownerTokenId, bool isNft) = directOwnerOf(
            tokenId
        );
        if (isNft) {
            owner = IERC6059(owner).ownerOf(ownerTokenId);
        }
        return owner;
    }

    /**
     * @inheritdoc IERC6059
     */
    function directOwnerOf(
        uint256 tokenId
    ) public view virtual returns (address, uint256, bool) {
        DirectOwner memory owner = _RMRKOwners[tokenId];
        if (owner.ownerAddress == address(0)) revert ERC721InvalidTokenId();

        return (owner.ownerAddress, owner.tokenId, owner.tokenId != 0);
    }

    ////////////////////////////////////////
    //              BURNING
    ////////////////////////////////////////

    /**
     * @notice Used to burn a given token.
     * @dev In case the token has any child tokens, the execution will be reverted.
     * @param tokenId ID of the token to burn
     */
    function burn(uint256 tokenId) public virtual {
        burn(tokenId, 0);
    }

    /**
     * @inheritdoc IERC6059
     */
    function burn(
        uint256 tokenId,
        uint256 maxChildrenBurns
    ) public virtual onlyApprovedOrDirectOwner(tokenId) returns (uint256) {
        return _burn(tokenId, maxChildrenBurns);
    }

    /**
     * @notice Used to burn a token.
     * @dev When a token is burned, its children are recursively burned as well.
     * @dev The approvals are cleared when the token is burned.
     * @dev Requirements:
     *
     *  - `tokenId` must exist.
     * @dev Emits a {Transfer} event.
     * @dev Emits a {NestTransfer} event.
     * @param tokenId ID of the token to burn
     * @param maxChildrenBurns Maximum children to recursively burn
     * @return The number of recursive burns it took to burn all of the children
     */
    function _burn(
        uint256 tokenId,
        uint256 maxChildrenBurns
    ) internal virtual returns (uint256) {
        (address immediateOwner, uint256 parentId, ) = directOwnerOf(tokenId);
        address owner = ownerOf(tokenId);
        _balances[immediateOwner] -= 1;

        _beforeTokenTransfer(owner, address(0), tokenId);
        _beforeNestedTokenTransfer(
            immediateOwner,
            address(0),
            parentId,
            0,
            tokenId,
            ""
        );

        _approve(address(0), tokenId);
        _cleanApprovals(tokenId);

        Child[] memory children = childrenOf(tokenId);

        delete _activeChildren[tokenId];
        delete _pendingChildren[tokenId];
        delete _tokenApprovals[tokenId][owner];

        uint256 pendingRecursiveBurns;
        uint256 totalChildBurns;

        uint256 length = children.length; //gas savings
        for (uint256 i; i < length; ) {
            if (totalChildBurns >= maxChildrenBurns)
                revert RMRKMaxRecursiveBurnsReached(
                    children[i].contractAddress,
                    children[i].tokenId
                );
            delete _childIsInActive[children[i].contractAddress][
                children[i].tokenId
            ];
            unchecked {
                // At this point we know pendingRecursiveBurns must be at least 1
                pendingRecursiveBurns = maxChildrenBurns - totalChildBurns;
            }
            // We substract one to the next level to count for the token being burned, then add it again on returns
            // This is to allow the behavior of 0 recursive burns meaning only the current token is deleted.
            totalChildBurns +=
                IERC6059(children[i].contractAddress).burn(
                    children[i].tokenId,
                    pendingRecursiveBurns - 1
                ) +
                1;
            unchecked {
                ++i;
            }
        }
        // Can't remove before burning child since child will call back to get root owner
        delete _RMRKOwners[tokenId];

        emit Transfer(owner, address(0), tokenId);
        emit NestTransfer(immediateOwner, address(0), parentId, 0, tokenId);

        _afterTokenTransfer(owner, address(0), tokenId);
        _afterNestedTokenTransfer(
            immediateOwner,
            address(0),
            parentId,
            0,
            tokenId,
            ""
        );

        return totalChildBurns;
    }

    ////////////////////////////////////////
    //              APPROVALS
    ////////////////////////////////////////

    /**
     * @notice Used to grant a one-time approval to manage one's token.
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * @dev The approval is cleared when the token is transferred.
     * @dev Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     * @dev Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     * @dev Emits an {Approval} event.
     * @param to Address receiving the approval
     * @param tokenId ID of the token for which the approval is being granted
     */
    function approve(address to, uint256 tokenId) public virtual {
        address owner = ownerOf(tokenId);
        if (to == owner) revert ERC721ApprovalToCurrentOwner();

        if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender()))
            revert ERC721ApproveCallerIsNotOwnerNorApprovedForAll();

        _approve(to, tokenId);
    }

    /**
     * @notice Used to retrieve the account approved to manage given token.
     * @dev Requirements:
     *
     *  - `tokenId` must exist.
     * @param tokenId ID of the token to check for approval
     * @return Address of the account approved to manage the token
     */
    function getApproved(
        uint256 tokenId
    ) public view virtual returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId][ownerOf(tokenId)];
    }

    /**
     * @notice Used to approve or remove `operator` as an operator for the caller.
     * @dev Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     * @dev Requirements:
     *
     * - The `operator` cannot be the caller.
     * @dev Emits an {ApprovalForAll} event.
     * @param operator Address of the operator being managed
     * @param approved A boolean value signifying whether the approval is being granted (`true`) or (`revoked`)
     */
    function setApprovalForAll(address operator, bool approved) public virtual {
        if (_msgSender() == operator) revert ERC721ApproveToCaller();
        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @notice Used to check if the given address is allowed to manage the tokens of the specified address.
     * @param owner Address of the owner of the tokens
     * @param operator Address being checked for approval
     * @return A boolean value signifying whether the *operator* is allowed to manage the tokens of the *owner* (`true`)
     *  or not (`false`)
     */
    function isApprovedForAll(
        address owner,
        address operator
    ) public view virtual returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @notice Used to grant an approval to manage a given token.
     * @dev Emits an {Approval} event.
     * @param to Address to which the approval is being granted
     * @param tokenId ID of the token for which the approval is being granted
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        address owner = ownerOf(tokenId);
        _tokenApprovals[tokenId][owner] = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @notice Used to update the owner of the token and clear the approvals associated with the previous owner.
     * @dev The `destinationId` should equal `0` if the new owner is an externally owned account.
     * @param tokenId ID of the token being updated
     * @param destinationId ID of the token to receive the given token
     * @param to Address of account to receive the token
     */
    function _updateOwnerAndClearApprovals(
        uint256 tokenId,
        uint256 destinationId,
        address to
    ) internal {
        _RMRKOwners[tokenId] = DirectOwner({
            ownerAddress: to,
            tokenId: destinationId
        });

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

    /**
     * @notice Used to remove approvals for the current owner of the given token.
     * @param tokenId ID of the token to clear the approvals for
     */
    function _cleanApprovals(uint256 tokenId) internal virtual {}

    ////////////////////////////////////////
    //              UTILS
    ////////////////////////////////////////

    /**
     * @notice Used to check whether the given account is allowed to manage the given token.
     * @dev Requirements:
     *
     *  - `tokenId` must exist.
     * @param spender Address that is being checked for approval
     * @param tokenId ID of the token being checked
     * @return A boolean value indicating whether the `spender` is approved to manage the given token
     */
    function _isApprovedOrOwner(
        address spender,
        uint256 tokenId
    ) internal view virtual returns (bool) {
        address owner = ownerOf(tokenId);
        return (spender == owner ||
            isApprovedForAll(owner, spender) ||
            getApproved(tokenId) == spender);
    }

    /**
     * @notice Used to check whether the account is approved to manage the token or its direct owner.
     * @param spender Address that is being checked for approval or direct ownership
     * @param tokenId ID of the token being checked
     * @return A boolean value indicating whether the `spender` is approved to manage the given token or its
     *  direct owner
     */
    function _isApprovedOrDirectOwner(
        address spender,
        uint256 tokenId
    ) internal view virtual returns (bool) {
        (address owner, uint256 parentId, ) = directOwnerOf(tokenId);
        // When the parent is an NFT, only it can do operations
        if (parentId != 0) {
            return (spender == owner);
        }
        // Otherwise, the owner or approved address can
        return (spender == owner ||
            isApprovedForAll(owner, spender) ||
            getApproved(tokenId) == spender);
    }

    /**
     * @notice Used to enforce that the given token has been minted.
     * @dev Reverts if the `tokenId` has not been minted yet.
     * @dev The validation checks whether the owner of a given token is a `0x0` address and considers it not minted if
     *  it is. This means that both tokens that haven't been minted yet as well as the ones that have already been
     *  burned will cause the transaction to be reverted.
     * @param tokenId ID of the token to check
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        if (!_exists(tokenId)) revert ERC721InvalidTokenId();
    }

    /**
     * @notice Used to check whether the given token exists.
     * @dev Tokens start existing when they are minted (`_mint`) and stop existing when they are burned (`_burn`).
     * @param tokenId ID of the token being checked
     * @return A boolean value signifying whether the token exists
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _RMRKOwners[tokenId].ownerAddress != address(0);
    }

    /**
     * @notice Used to invoke {IERC721Receiver-onERC721Received} on a target address.
     * @dev The call is not executed if the target address is not a contract.
     * @param from Address representing the previous owner of the given token
     * @param to Yarget address that will receive the tokens
     * @param tokenId ID of the token to be transferred
     * @param data Optional data to send along with the call
     * @return Boolean value signifying whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try
                IERC721Receiver(to).onERC721Received(
                    _msgSender(),
                    from,
                    tokenId,
                    data
                )
            returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == uint256(0)) {
                    revert ERC721TransferToNonReceiverImplementer();
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    ////////////////////////////////////////
    //      CHILD MANAGEMENT PUBLIC
    ////////////////////////////////////////

    /**
     * @inheritdoc IERC6059
     */
    function addChild(
        uint256 parentId,
        uint256 childId,
        bytes memory data
    ) public virtual {
        _requireMinted(parentId);

        address childAddress = _msgSender();
        if (!childAddress.isContract()) revert RMRKIsNotContract();

        Child memory child = Child({
            contractAddress: childAddress,
            tokenId: childId
        });

        _beforeAddChild(parentId, childAddress, childId, data);

        uint256 length = pendingChildrenOf(parentId).length;

        if (length < 128) {
            _pendingChildren[parentId].push(child);
        } else {
            revert RMRKMaxPendingChildrenReached();
        }

        // Previous length matches the index for the new child
        emit ChildProposed(parentId, length, childAddress, childId);

        _afterAddChild(parentId, childAddress, childId, data);
    }

    /**
     * @inheritdoc IERC6059
     */
    function acceptChild(
        uint256 parentId,
        uint256 childIndex,
        address childAddress,
        uint256 childId
    ) public virtual onlyApprovedOrOwner(parentId) {
        _acceptChild(parentId, childIndex, childAddress, childId);
    }

    /**
     * @notice Used to accept a pending child token for a given parent token.
     * @dev This moves the child token from parent token's pending child tokens array into the active child tokens
     *  array.
     * @dev Requirements:
     *
     *  - `tokenId` must exist
     *  - `index` must be in range of the pending children array
     * @dev Emits ***ChildAccepted*** event.
     * @param parentId ID of the parent token for which the child token is being accepted
     * @param childIndex Index of a child tokem in the given parent's pending children array
     * @param childAddress Address of the collection smart contract of the child token expected to be located at the
     *  specified index of the given parent token's pending children array
     * @param childId ID of the child token expected to be located at the specified index of the given parent token's
     *  pending children array
     */
    function _acceptChild(
        uint256 parentId,
        uint256 childIndex,
        address childAddress,
        uint256 childId
    ) internal virtual {
        Child memory child = pendingChildOf(parentId, childIndex);
        _checkExpectedChild(child, childAddress, childId);
        if (_childIsInActive[childAddress][childId] != 0)
            revert RMRKChildAlreadyExists();

        _beforeAcceptChild(parentId, childIndex, childAddress, childId);

        // Remove from pending:
        _removeChildByIndex(_pendingChildren[parentId], childIndex);

        // Add to active:
        _activeChildren[parentId].push(child);
        _childIsInActive[childAddress][childId] = 1; // We use 1 as true

        emit ChildAccepted(parentId, childIndex, childAddress, childId);

        _afterAcceptChild(parentId, childIndex, childAddress, childId);
    }

    /**
     * @inheritdoc IERC6059
     */
    function rejectAllChildren(
        uint256 tokenId,
        uint256 maxRejections
    ) public virtual onlyApprovedOrOwner(tokenId) {
        _rejectAllChildren(tokenId, maxRejections);
    }

    /**
     * @notice Used to reject all pending children of a given parent token.
     * @dev Removes the children from the pending array mapping.
     * @dev This does not update the ownership storage data on children. If necessary, ownership can be reclaimed by the
     *  rootOwner of the previous parent.
     * @dev Requirements:
     *
     *  - `tokenId` must exist
     * @dev Emits ***AllChildrenRejected*** event.
     * @param tokenId ID of the parent token for which to reject all of the pending tokens.
     * @param maxRejections Maximum number of expected children to reject, used to prevent from rejecting children which
     *  arrive just before this operation.
     */
    function _rejectAllChildren(
        uint256 tokenId,
        uint256 maxRejections
    ) internal virtual {
        if (_pendingChildren[tokenId].length > maxRejections)
            revert RMRKUnexpectedNumberOfChildren();

        _beforeRejectAllChildren(tokenId);
        delete _pendingChildren[tokenId];
        emit AllChildrenRejected(tokenId);
        _afterRejectAllChildren(tokenId);
    }

    /**
     * @inheritdoc IERC6059
     */
    function transferChild(
        uint256 tokenId,
        address to,
        uint256 destinationId,
        uint256 childIndex,
        address childAddress,
        uint256 childId,
        bool isPending,
        bytes memory data
    ) public virtual onlyApprovedOrOwner(tokenId) {
        _transferChild(
            tokenId,
            to,
            destinationId,
            childIndex,
            childAddress,
            childId,
            isPending,
            data
        );
    }

    /**
     * @notice Used to transfer a child token from a given parent token.
     * @dev When transferring a child token, the owner of the token is set to `to`, or is not updated in the event of
     *  `to` being the `0x0` address.
     * @dev Requirements:
     *
     *  - `tokenId` must exist.
     * @dev Emits {ChildTransferred} event.
     * @param tokenId ID of the parent token from which the child token is being transferred
     * @param to Address to which to transfer the token to
     * @param destinationId ID of the token to receive this child token (MUST be 0 if the destination is not a token)
     * @param childIndex Index of a token we are transferring, in the array it belongs to (can be either active array or
     *  pending array)
     * @param childAddress Address of the child token's collection smart contract.
     * @param childId ID of the child token in its own collection smart contract.
     * @param isPending A boolean value indicating whether the child token being transferred is in the pending array of
     *  the parent token (`true`) or in the active array (`false`)
     * @param data Additional data with no specified format, sent in call to `_to`
     */
    function _transferChild(
        uint256 tokenId,
        address to,
        uint256 destinationId, // newParentId
        uint256 childIndex,
        address childAddress,
        uint256 childId,
        bool isPending,
        bytes memory data
    ) internal virtual {
        Child memory child;
        if (isPending) {
            child = pendingChildOf(tokenId, childIndex);
        } else {
            child = childOf(tokenId, childIndex);
        }
        _checkExpectedChild(child, childAddress, childId);

        _beforeTransferChild(
            tokenId,
            childIndex,
            childAddress,
            childId,
            isPending,
            data
        );

        if (isPending) {
            _removeChildByIndex(_pendingChildren[tokenId], childIndex);
        } else {
            delete _childIsInActive[childAddress][childId];
            _removeChildByIndex(_activeChildren[tokenId], childIndex);
        }

        if (to != address(0)) {
            if (destinationId == uint256(0)) {
                IERC721(childAddress).safeTransferFrom(
                    address(this),
                    to,
                    childId,
                    data
                );
            } else {
                // Destination is an NFT
                IERC6059(child.contractAddress).nestTransferFrom(
                    address(this),
                    to,
                    child.tokenId,
                    destinationId,
                    data
                );
            }
        }

        emit ChildTransferred(
            tokenId,
            childIndex,
            childAddress,
            childId,
            isPending,
            to == address(0)
        );
        _afterTransferChild(
            tokenId,
            childIndex,
            childAddress,
            childId,
            isPending,
            data
        );
    }

    /**
     * @notice Used to verify that the child being accessed is the intended child.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @param child A Child struct of a child being accessed
     * @param expectedAddress The address expected to be the one of the child
     * @param expectedId The token ID expected to be the one of the child
     */
    function _checkExpectedChild(
        Child memory child,
        address expectedAddress,
        uint256 expectedId
    ) private pure {
        if (
            expectedAddress != child.contractAddress ||
            expectedId != child.tokenId
        ) revert RMRKUnexpectedChildId();
    }

    ////////////////////////////////////////
    //      CHILD MANAGEMENT GETTERS
    ////////////////////////////////////////

    /**
     * @inheritdoc IERC6059
     */

    function childrenOf(
        uint256 parentId
    ) public view virtual returns (Child[] memory) {
        Child[] memory children = _activeChildren[parentId];
        return children;
    }

    /**
     * @inheritdoc IERC6059
     */

    function pendingChildrenOf(
        uint256 parentId
    ) public view virtual returns (Child[] memory) {
        Child[] memory pendingChildren = _pendingChildren[parentId];
        return pendingChildren;
    }

    /**
     * @inheritdoc IERC6059
     */
    function childOf(
        uint256 parentId,
        uint256 index
    ) public view virtual returns (Child memory) {
        if (childrenOf(parentId).length <= index)
            revert RMRKChildIndexOutOfRange();
        Child memory child = _activeChildren[parentId][index];
        return child;
    }

    /**
     * @inheritdoc IERC6059
     */
    function pendingChildOf(
        uint256 parentId,
        uint256 index
    ) public view virtual returns (Child memory) {
        if (pendingChildrenOf(parentId).length <= index)
            revert RMRKPendingChildIndexOutOfRange();
        Child memory child = _pendingChildren[parentId][index];
        return child;
    }

    // HOOKS

    /**
     * @notice Hook that is called before nested token transfer.
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param from Address from which the token is being transferred
     * @param to Address to which the token is being transferred
     * @param fromTokenId ID of the token from which the given token is being transferred
     * @param toTokenId ID of the token to which the given token is being transferred
     * @param tokenId ID of the token being transferred
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _beforeNestedTokenTransfer(
        address from,
        address to,
        uint256 fromTokenId,
        uint256 toTokenId,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {}

    /**
     * @notice Hook that is called after nested token transfer.
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param from Address from which the token was transferred
     * @param to Address to which the token was transferred
     * @param fromTokenId ID of the token from which the given token was transferred
     * @param toTokenId ID of the token to which the given token was transferred
     * @param tokenId ID of the token that was transferred
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _afterNestedTokenTransfer(
        address from,
        address to,
        uint256 fromTokenId,
        uint256 toTokenId,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {}

    /**
     * @notice Hook that is called before a child is added to the pending tokens array of a given token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param tokenId ID of the token that will receive a new pending child token
     * @param childAddress Address of the collection smart contract of the child token expected to be located at the
     *  specified index of the given parent token's pending children array
     * @param childId ID of the child token expected to be located at the specified index of the given parent token's
     *  pending children array
     * @param data Additional data with no specified format
     */
    function _beforeAddChild(
        uint256 tokenId,
        address childAddress,
        uint256 childId,
        bytes memory data
    ) internal virtual {}

    /**
     * @notice Hook that is called after a child is added to the pending tokens array of a given token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param tokenId ID of the token that has received a new pending child token
     * @param childAddress Address of the collection smart contract of the child token expected to be located at the
     *  specified index of the given parent token's pending children array
     * @param childId ID of the child token expected to be located at the specified index of the given parent token's
     *  pending children array
     * @param data Additional data with no specified format
     */
    function _afterAddChild(
        uint256 tokenId,
        address childAddress,
        uint256 childId,
        bytes memory data
    ) internal virtual {}

    /**
     * @notice Hook that is called before a child is accepted to the active tokens array of a given token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param parentId ID of the token that will accept a pending child token
     * @param childIndex Index of the child token to accept in the given parent token's pending children array
     * @param childAddress Address of the collection smart contract of the child token expected to be located at the
     *  specified index of the given parent token's pending children array
     * @param childId ID of the child token expected to be located at the specified index of the given parent token's
     *  pending children array
     */
    function _beforeAcceptChild(
        uint256 parentId,
        uint256 childIndex,
        address childAddress,
        uint256 childId
    ) internal virtual {}

    /**
     * @notice Hook that is called after a child is accepted to the active tokens array of a given token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param parentId ID of the token that has accepted a pending child token
     * @param childIndex Index of the child token that was accpeted in the given parent token's pending children array
     * @param childAddress Address of the collection smart contract of the child token that was expected to be located
     *  at the specified index of the given parent token's pending children array
     * @param childId ID of the child token that was expected to be located at the specified index of the given parent
     *  token's pending children array
     */
    function _afterAcceptChild(
        uint256 parentId,
        uint256 childIndex,
        address childAddress,
        uint256 childId
    ) internal virtual {}

    /**
     * @notice Hook that is called before a child is transferred from a given child token array of a given token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param tokenId ID of the token that will transfer a child token
     * @param childIndex Index of the child token that will be transferred from the given parent token's children array
     * @param childAddress Address of the collection smart contract of the child token that is expected to be located
     *  at the specified index of the given parent token's children array
     * @param childId ID of the child token that is expected to be located at the specified index of the given parent
     *  token's children array
     * @param isPending A boolean value signifying whether the child token is being transferred from the pending child
     *  tokens array (`true`) or from the active child tokens array (`false`)
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _beforeTransferChild(
        uint256 tokenId,
        uint256 childIndex,
        address childAddress,
        uint256 childId,
        bool isPending,
        bytes memory data
    ) internal virtual {}

    /**
     * @notice Hook that is called after a child is transferred from a given child token array of a given token.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param tokenId ID of the token that has transferred a child token
     * @param childIndex Index of the child token that was transferred from the given parent token's children array
     * @param childAddress Address of the collection smart contract of the child token that was expected to be located
     *  at the specified index of the given parent token's children array
     * @param childId ID of the child token that was expected to be located at the specified index of the given parent
     *  token's children array
     * @param isPending A boolean value signifying whether the child token was transferred from the pending child tokens
     *  array (`true`) or from the active child tokens array (`false`)
     * @param data Additional data with no specified format, sent in the addChild call
     */
    function _afterTransferChild(
        uint256 tokenId,
        uint256 childIndex,
        address childAddress,
        uint256 childId,
        bool isPending,
        bytes memory data
    ) internal virtual {}

    /**
     * @notice Hook that is called before a pending child tokens array of a given token is cleared.
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param tokenId ID of the token that will reject all of the pending child tokens
     */
    function _beforeRejectAllChildren(uint256 tokenId) internal virtual {}

    /**
     * @notice Hook that is called after a pending child tokens array of a given token is cleared.
     * @dev To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     * @param tokenId ID of the token that has rejected all of the pending child tokens
     */
    function _afterRejectAllChildren(uint256 tokenId) internal virtual {}

    // HELPERS

    /**
     * @notice Used to remove a specified child token form an array using its index within said array.
     * @dev The caller must ensure that the length of the array is valid compared to the index passed.
     * @dev The Child struct consists of the following values:
     *  [
     *      tokenId,
     *      contractAddress
     *  ]
     * @param array An array od Child struct containing info about the child tokens in a given child tokens array
     * @param index An index of the child token to remove in the accompanying array
     */
    function _removeChildByIndex(Child[] storage array, uint256 index) private {
        array[index] = array[array.length - 1];
        array.pop();
    }
}

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

pragma solidity ^0.8.18;

error RentrantCall();

/**
 * @title ReentrancyGuard
 * @notice Smart contract used to guard against potential reentrancy exploits.
 * @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;

    /**
     * @notice Initializes the ReentrancyGuard with the `_status` of `_NOT_ENTERED`.
     */
    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @notice Used to ensure that the function it is applied to cannot be reentered.
     * @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() {
        _nonReentrantIn();
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @notice Used to ensure that the current call is not a reentrant call.
     * @dev If reentrant call is detected, the execution will be reverted.
     */
    function _nonReentrantIn() private {
        // On the first call to nonReentrant, _notEntered will be true
        if (_status == _ENTERED) revert RentrantCall();

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

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

/**
 * @title RMRKCollectionMetadata
 * @author RMRK team
 * @notice Smart contract of the RMRK Collection metadata module.
 */
contract RMRKCollectionMetadata {
    string private _collectionMetadata;

    /**
     * @notice Used to initialize the contract with the given metadata.
     * @param collectionMetadata_ The collection metadata with which to initialize the smart contract
     */
    constructor(string memory collectionMetadata_) {
        _setCollectionMetadata(collectionMetadata_);
    }

    /**
     * @notice Used to set the metadata of the collection.
     * @param newMetadata The new metadata of the collection
     */
    function _setCollectionMetadata(string memory newMetadata) internal {
        _collectionMetadata = newMetadata;
    }

    /**
     * @notice Used to retrieve the metadata of the collection.
     * @return string The metadata URI of the collection
     */
    function collectionMetadata() public view returns (string memory) {
        return _collectionMetadata;
    }
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.18;

import "../access/OwnableLock.sol";
import "../library/RMRKErrors.sol";

/**
 * @title RMRKMintingUtils
 * @author RMRK team
 * @notice Smart contract of the RMRK minting utils module.
 * @dev This smart contract includes the top-level utilities for managing minting and implements OwnableLock by default.
 * @dev Max supply-related and pricing variables are immutable after deployment.
 */
contract RMRKMintingUtils is OwnableLock {
    uint256 internal _nextId;
    uint256 internal _totalSupply;
    uint256 internal _maxSupply;
    uint256 internal immutable _pricePerMint;

    /**
     * @notice Initializes the smart contract with a given maximum supply and minting price.
     * @param maxSupply_ The maximum supply of tokens to initialize the smart contract with
     * @param pricePerMint_ The minting price to initialize the smart contract with, expressed in the smallest
     *  denomination of the native currency of the chain to which the smart contract is deployed to
     */
    constructor(uint256 maxSupply_, uint256 pricePerMint_) {
        _maxSupply = maxSupply_;
        _pricePerMint = pricePerMint_;
    }

    /**
     * @notice Used to verify that the sale of the given token is still available.
     * @dev If the maximum supply is reached, the execution will be reverted.
     */
    modifier saleIsOpen() {
        _checkSaleIsOpen();
        _;
    }

    /**
     * @inheritdoc OwnableLock
     */
    function setLock() public virtual override onlyOwner {
        super.setLock();
        _maxSupply = _totalSupply;
    }

    /**
     * @notice Used to retrieve the total supply of the tokens in a collection.
     * @return The number of tokens in a collection
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @notice Used to retrieve the maximum supply of the collection.
     * @return The maximum supply of tokens in the collection
     */
    function maxSupply() public view returns (uint256) {
        return _maxSupply;
    }

    /**
     * @notice Used to retrieve the price per mint.
     * @return The price per mint of a single token expressed in the lowest denomination of a native currency
     */
    function pricePerMint() public view returns (uint256) {
        return _pricePerMint;
    }

    /**
     * @notice Used to withdraw the minting proceedings to a specified address.
     * @dev This function can only be called by the owner.
     * @param to Address to receive the given amount of minting proceedings
     * @param amount The amount to withdraw
     */
    function withdrawRaised(address to, uint256 amount) external onlyOwner {
        _withdraw(to, amount);
    }

    /**
     * @notice Used to withdraw the minting proceedings to a specified address.
     * @param _address Address to receive the given amount of minting proceedings
     * @param _amount The amount to withdraw
     */
    function _withdraw(address _address, uint256 _amount) private {
        (bool success, ) = _address.call{value: _amount}("");
        require(success, "Transfer failed.");
    }

    /**
     * @notice Used to verify that the sale is still open.
     * @dev In case the maximum supply of the collection is reached, the execution is reverted.
     */
    function _checkSaleIsOpen() private view {
        if (_nextId >= _maxSupply) revert RMRKMintOverMax();
    }
}

// SPDX-License-Identifier: Apache-2.0

pragma solidity ^0.8.18;

import "@rmrk-team/evm-contracts/contracts/RMRK/equippable/RMRKEquippable.sol";
import "@rmrk-team/evm-contracts/contracts/RMRK/extension/RMRKRoyalties.sol";
import "@rmrk-team/evm-contracts/contracts/RMRK/utils/RMRKCollectionMetadata.sol";
import "@rmrk-team/evm-contracts/contracts/RMRK/utils/RMRKMintingUtils.sol";
import "@rmrk-team/evm-contracts/contracts/implementations/IRMRKInitData.sol";

error RMRKMintZero();

/**
 * @title SpacerItems
 * @author RMRK team
 */
abstract contract SpacerBase is
    IRMRKInitData,
    RMRKMintingUtils,
    RMRKCollectionMetadata,
    RMRKRoyalties,
    RMRKEquippable
{
    uint256 private _totalAssets;
    uint64 private constant _LOWEST_POSSIBLE_PRIORITY = 2 ^ (64 - 1);

    constructor(
        string memory name_,
        string memory symbol_,
        string memory collectionMetadata_,
        InitData memory data
    )
        RMRKMintingUtils(data.maxSupply, data.pricePerMint)
        RMRKCollectionMetadata(collectionMetadata_)
        RMRKRoyalties(data.royaltyRecipient, data.royaltyPercentageBps)
        RMRKEquippable(name_, symbol_)
    {}

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);
        if (to == address(0)) {
            unchecked {
                _totalSupply -= 1;
            }
        }
    }

    function addAssetsToTokens(
        uint256[] memory tokenIds,
        uint64[] memory assetIds,
        uint64 replacesAssetWithId
    ) public virtual onlyOwnerOrContributor {
        uint256 len = tokenIds.length;
        for (uint256 i; i < len; ) {
            _addAssetToToken(tokenIds[0], assetIds[0], replacesAssetWithId);
            unchecked {
                ++i;
            }
        }
    }

    function addAssetToToken(
        uint256 tokenId,
        uint64 assetId,
        uint64 replacesAssetWithId
    ) public virtual onlyOwnerOrContributor {
        _addAssetToToken(tokenId, assetId, replacesAssetWithId);
    }

    function addAssetEntry(
        string memory metadataURI
    ) public virtual onlyOwnerOrContributor returns (uint256) {
        unchecked {
            _totalAssets += 1;
        }
        _addAssetEntry(uint64(_totalAssets), metadataURI);
        return _totalAssets;
    }

    function addEquippableAssetEntries(
        uint64 equippableGroupId,
        address catalogAddress,
        string[] memory metadataURI,
        uint64[] memory partIds
    ) public virtual onlyOwnerOrContributor {
        uint256 len = metadataURI.length;
        for (uint256 i; i < len; ) {
            addEquippableAssetEntry(
                equippableGroupId,
                catalogAddress,
                metadataURI[i],
                partIds
            );
            unchecked {
                ++i;
            }
        }
    }

    function addEquippableAssetEntry(
        uint64 equippableGroupId,
        address catalogAddress,
        string memory metadataURI,
        uint64[] memory partIds
    ) public virtual onlyOwnerOrContributor returns (uint64) {
        unchecked {
            _totalAssets += 1;
        }
        _addAssetEntry(
            uint64(_totalAssets),
            equippableGroupId,
            catalogAddress,
            metadataURI,
            partIds
        );
        return uint64(_totalAssets);
    }

    function setValidParentForEquippableGroup(
        uint64 equippableGroupId,
        address parentAddress,
        uint64 partId
    ) public virtual onlyOwnerOrContributor {
        _setValidParentForEquippableGroup(
            equippableGroupId,
            parentAddress,
            partId
        );
    }

    function totalAssets() public view virtual returns (uint256) {
        return _totalAssets;
    }

    function updateRoyaltyRecipient(
        address newRoyaltyRecipient
    ) public virtual override onlyOwner {
        _setRoyaltyRecipient(newRoyaltyRecipient);
    }

    function tokenURI(
        uint256 tokenId
    ) public view virtual returns (string memory) {
        _requireMinted(tokenId);
        uint64[] memory priorities = getActiveAssetPriorities(tokenId);
        // This will always be at least 1, since we can only mint with an asset directly
        uint256 len = priorities.length;
        uint64 maxPriority = _LOWEST_POSSIBLE_PRIORITY;
        uint64 maxPriorityIndex;
        for (uint64 i; i < len; ) {
            uint64 currentPrio = priorities[i];
            if (currentPrio < maxPriority) {
                maxPriority = currentPrio;
                maxPriorityIndex = i;
            }
            unchecked {
                ++i;
            }
        }
        uint64 maxPriorityAssetId = getActiveAssets(tokenId)[maxPriorityIndex];
        return getAssetMetadata(tokenId, maxPriorityAssetId);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : name_ (string): Spacer Items
Arg [1] : symbol_ (string): SPACERSITEMS
Arg [2] : collectionMetadata_ (string): ipfs://QmPorhEjDy3sHu5HVMFW5Bbwt853Sx8A2CfgaHEszUmVC4/SpacerItems.json
Arg [3] : data (tuple): 
     Arg [1] : erc20TokenAddress (address): 0x0000000000000000000000000000000000000000
     Arg [2] : tokenUriIsEnumerable (bool): False
     Arg [3] : royaltyRecipient (address): 0xB32153Aa5b3Dd930D265Bc800d2F7d657c994828
     Arg [4] : royaltyPercentageBps (uint16): 300
     Arg [5] : maxSupply (uint256): 115792089237316195423570985008687907853269984665640564039457584007913129639935
     Arg [6] : pricePerMint (uint256): 1000000000000000000


-----Encoded View---------------
17 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [2] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 000000000000000000000000b32153aa5b3dd930d265bc800d2f7d657c994828
Arg [6] : 000000000000000000000000000000000000000000000000000000000000012c
Arg [7] : ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
Arg [8] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [9] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [10] : 537061636572204974656d730000000000000000000000000000000000000000
Arg [11] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [12] : 535041434552534954454d530000000000000000000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000046
Arg [14] : 697066733a2f2f516d506f7268456a4479337348753548564d46573542627774
Arg [15] : 3835335378384132436667614845737a556d5643342f5370616365724974656d
Arg [16] : 732e6a736f6e0000000000000000000000000000000000000000000000000000