// File: contracts/SwapERC1155UAE.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";

contract SwapERC1155UAE is Ownable, Pausable, ReentrancyGuard, ERC1155Holder {
    // Swap params
    uint256 private constant _TOKENS_PER_RECIPIENT = 1;
    bool private _batchReception;
    bool private _unlimitedReception;
    uint256 private _releaseTime;

    // Mapping for accounting white token contract addresses
    mapping(address => bool) private _whitelistedTokens;

    // Mapping from recipient address to received tokens from contract address
    mapping(address => mapping(address => uint256)) private _receivedTokens;

    // Emitted when `tokenAddress` added to whitelist.
    event AddToTokenWhitelist(address tokenAddress);
    // Emitted when `tokenAddress` removed from whitelist.
    event RemoveFromTokenWhitelist(address tokenAddress);

    // Emitted when batch reception updated
    event BatchReceptionUpdated(bool batchReception);

    // Emitted when unlimited reception updated
    event UnlimitedReceptionUpdated(bool unlimitedReception);

    // Emitted when `account` receive `amount` of type `tokenId` from contract `tokenAddress`.
    event TokenReceived(address indexed account, address tokenAddress, uint256 tokenId, uint256 amount);
    // Emitted when owner `account` withdraw `amount` of type `tokenId` from contract `tokenAddress`.
    event TokenWithdrawn(address indexed account, address tokenAddress, uint256 tokenId, uint256 amount);

    constructor(uint256 releaseTime_) {
        _batchReception = false;
        _unlimitedReception = false;
        _releaseTime = releaseTime_;
    }

    function isWhiteListedToken(address tokenAddress_) external view virtual returns (bool) {
        return _whitelistedTokens[tokenAddress_];
    }

    function isWhiteListedTokenBatch(address[] memory tokenAddresses_) external view virtual returns (bool[] memory) {
        bool[] memory batchWhiteListedTokens = new bool[](tokenAddresses_.length);
        for (uint256 i = 0; i < tokenAddresses_.length; ++i) {
            batchWhiteListedTokens[i] = _whitelistedTokens[tokenAddresses_[i]];
        }
        return batchWhiteListedTokens;
    }

    function batchReceptionAllowed() external view virtual returns (bool) {
        return _batchReception;
    }

    function unlimitedReceptionAllowed() external view virtual returns (bool) {
        return _unlimitedReception;
    }

    function tokenBalance(address tokenAddress_, uint256 tokenId_) public view virtual returns (uint256 balance) {
        if (tokenAddress_ != address(0)) {
            balance = IERC1155(tokenAddress_).balanceOf(address(this), tokenId_);
        }
        return balance;
    }

    function tokenBalanceBatch(address[] memory tokenAddresses_, uint256[] memory tokenIds_)
        public
        view
        virtual
        returns (uint256[] memory batchBalances)
    {
        require(tokenAddresses_.length == tokenIds_.length, "SwapERC1155UAE: arrays length mismatch");
        batchBalances = new uint256[](tokenAddresses_.length);
        for (uint256 i = 0; i < tokenAddresses_.length; ++i) {
            if (tokenAddresses_[i] != address(0)) {
                batchBalances[i] = IERC1155(tokenAddresses_[i]).balanceOf(address(this), tokenIds_[i]);
            }
        }
        return batchBalances;
    }

    function releaseTime() external view virtual returns (uint256) {
        return _releaseTime;
    }

    function checkBeforeClaimToken(
        address recipient_,
        address tokenAddress_,
        uint256 tokenId_
    ) external view virtual returns (bool)
    {
        bool releaseCheck = _releaseTime <= block.timestamp;
        bool balanceCheck = tokenBalance(tokenAddress_, tokenId_) > 0;
        bool recipientCheck = _unlimitedReception || _receivedTokens[recipient_][tokenAddress_] == 0;
        return !paused() && releaseCheck && _whitelistedTokens[tokenAddress_] && balanceCheck && recipientCheck;
    }

    function checkBeforeClaimTokenBatch(
        address recipient_,
        address[] memory tokenAddresses_,
        uint256[] memory tokenIds_
    ) external view virtual returns (bool[] memory)
    {
        require(tokenAddresses_.length == tokenIds_.length, "SwapERC1155UAE: arrays length mismatch");
        bool releaseCheck = _releaseTime <= block.timestamp;
        bool[] memory batchCheckBeforeClaim = new bool[](tokenAddresses_.length);
        uint256[] memory batchBalances = tokenBalanceBatch(tokenAddresses_, tokenIds_);
        for (uint256 i = 0; i < tokenAddresses_.length; ++i) {
            bool balanceCheck = batchBalances[i] > 0;
            bool recipientCheck = _unlimitedReception || _receivedTokens[recipient_][tokenAddresses_[i]] == 0;
            batchCheckBeforeClaim[i] = !paused() && releaseCheck && _batchReception && _whitelistedTokens[tokenAddresses_[i]] && balanceCheck && recipientCheck;
        }
        return batchCheckBeforeClaim;
    }

    function claimToken(
        address tokenAddress_,
        uint256 tokenId_,
        bytes calldata data_
    )
        external
        virtual
        nonReentrant
        whenNotPaused
    {
        require(_releaseTime <= block.timestamp, "SwapERC1155UAE: release time has not come");
        _claim(_msgSender(), tokenAddress_, tokenId_, data_);
    }

    function claimTokenBatch(
        address[] memory tokenAddresses_,
        uint256[] memory tokenIds_,
        bytes calldata data_
    )
        external
        virtual
        nonReentrant
        whenNotPaused
    {
        require(_batchReception, "SwapERC1155UAE: batch reception is not allowed");
        require(tokenAddresses_.length == tokenIds_.length, "SwapERC1155UAE: arrays length mismatch");
        require(_releaseTime <= block.timestamp, "SwapERC1155UAE: release time has not come");
        for (uint256 i = 0; i < tokenAddresses_.length; ++i) {
            _claim(_msgSender(), tokenAddresses_[i], tokenIds_[i], data_);
        }
    }

    function pause() external virtual onlyOwner {
        _pause();
    }

    function unpause() external virtual onlyOwner {
        _unpause();
    }

    function addToTokenWhitelist(address tokenAddress_) external virtual onlyOwner {
        require(tokenAddress_ != address(0), "SwapERC1155UAE: invalid tokenAddress");
        _whitelistedTokens[tokenAddress_] = true;
        emit AddToTokenWhitelist(tokenAddress_);
    }

    function removeFromTokenWhitelist(address tokenAddress_) external virtual onlyOwner {
        require(tokenAddress_ != address(0), "SwapERC1155UAE: invalid tokenAddress");
        _whitelistedTokens[tokenAddress_] = false;
        emit RemoveFromTokenWhitelist(tokenAddress_);
    }

    function updateBatchReception(bool batchReception_) external virtual onlyOwner {
        _batchReception = batchReception_;
        emit BatchReceptionUpdated(batchReception_);
    }

    function updateUnlimitedReception(bool unlimitedReception_) external virtual onlyOwner {
        _unlimitedReception = unlimitedReception_;
        emit UnlimitedReceptionUpdated(unlimitedReception_);
    }

    function withdrawToken(
        address tokenAddress_,
        uint256 tokenId_,
        uint256 amount_,
        bytes calldata data_
    )
        external
        virtual
        onlyOwner
        nonReentrant
    {
        _withdraw(_msgSender(), tokenAddress_, tokenId_, amount_, data_);
    }

    function _claim(
        address recipient_,
        address tokenAddress_,
        uint256 tokenId_,
        bytes calldata data_
    ) internal virtual {
        require(_whitelistedTokens[tokenAddress_], "SwapERC1155UAE: tokenAddress is not whitelisted");
        require(_unlimitedReception || _receivedTokens[recipient_][tokenAddress_] == 0, "SwapERC1155UAE: recipient has already received token");

        _receivedTokens[recipient_][tokenAddress_] += _TOKENS_PER_RECIPIENT;
        IERC1155(tokenAddress_).safeTransferFrom(address(this), recipient_, tokenId_, _TOKENS_PER_RECIPIENT, data_);

        emit TokenReceived(recipient_, tokenAddress_, tokenId_, _TOKENS_PER_RECIPIENT);
    }

    function _withdraw(
        address recipient_,
        address tokenAddress_,
        uint256 tokenId_,
        uint256 amount_,
        bytes calldata data_
    ) internal virtual {
        require(tokenAddress_ != address(0), "SwapERC1155UAE: invalid tokenAddress");

        IERC1155(tokenAddress_).safeTransferFrom(address(this), recipient_, tokenId_, amount_, data_);

        emit TokenWithdrawn(recipient_, tokenAddress_, tokenId_, amount_);
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/security/Pausable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: @openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ERC1155Receiver.sol";

/**
 * @dev _Available since v3.1._
 */
contract ERC1155Holder is ERC1155Receiver {
    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(
        address,
        address,
        uint256[] memory,
        uint256[] memory,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC1155BatchReceived.selector;
    }
}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC1155Receiver.sol";
import "../../../utils/introspection/ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
    }
}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



// SPDX-License-Identifier: MIT

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);
}