// File: contracts/HouseGame.sol



// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./interfaces/IHabitat.sol";
import "./interfaces/IHouseTraits.sol";
import "./interfaces/ICHEDDAR.sol";
import "./interfaces/IHouse.sol";
import "./interfaces/IRandomizer.sol";


contract HouseGame is Ownable, ReentrancyGuard, Pausable {

  event MintCommitted(address indexed owner, uint256 indexed amount);
  event MintRevealed(address indexed owner, uint256 indexed amount);

  struct MintCommit {
    bool stake;
    uint16 amount;
  }

  // address -> commit id -> commits
  mapping(address => mapping(uint16 => MintCommit)) private _mintCommits;
  // address -> commit num of commit need revealed for account
  mapping(address => uint16) private _pendingCommitId;
  // pending mint amount
  uint16 private pendingMintAmt;
  // flag for commits allowment
  bool public allowCommits = true;

  // address => can call addCommitRandom
  mapping(address => bool) private admins;

  // reference to the Habitat for choosing random Cat thieves
  IHabitat public habitat;
  // reference to $CHEDDAR for burning on mint
  ICHEDDAR public cheddarToken;
  // reference to House Traits
  IHouseTraits public houseTraits;
  // reference to House NFT collection
  IHouse public houseNFT;
  // reference to IRandomizer
  IRandomizer public randomizer;


  constructor() {
    _pause();
  }

  /** CRITICAL TO SETUP */

  modifier requireContractsSet() {
      require(address(cheddarToken) != address(0) && address(houseTraits) != address(0)
        && address(habitat) != address(0) && address(houseNFT) != address(0)  && address(randomizer) != address(0)
        , "Contracts not set");
      _;
  }

  function setContracts(address _cheddar,address _houseTraits, address _habitat, address _house, address _randomizer) external onlyOwner {
    cheddarToken = ICHEDDAR(_cheddar);
    habitat = IHabitat(_habitat);
    houseNFT = IHouse(_house);
    houseTraits = IHouseTraits(_houseTraits);
    randomizer = IRandomizer(_randomizer);
  }

  /** EXTERNAL */

  function getPendingMint(address addr) external view returns (MintCommit memory) {
    require(_pendingCommitId[addr] != 0, "no pending commits");
    return _mintCommits[addr][_pendingCommitId[addr]];
  }

  function hasMintPending(address addr) external view returns (bool) {
    return _pendingCommitId[addr] != 0;
  }

  function canMint(address addr) external view returns (bool) {
    return _pendingCommitId[addr] != 0 && randomizer.getCommitRandom(_pendingCommitId[addr]) > 0;
  }

  function deleteCommit(address addr) external {
    require(owner() == _msgSender() || admins[_msgSender()], "Only admins can call this");
    uint16 commitIdCur = _pendingCommitId[_msgSender()];
    require(commitIdCur > 0, "No pending commit");
    delete _mintCommits[addr][commitIdCur];
    delete _pendingCommitId[addr];
  }

  function forceRevealCommit(address addr) external {
    require(owner() == _msgSender() || admins[_msgSender()], "Only admins can call this");
    reveal(addr);
  }

  /** Initiate the start of a mint. This action burns $CHEDDAR, as the intent of committing is that you cannot back out once you've started.
    * This will add users into the pending queue, to be revealed after a random seed is generated and assigned to the commit id this
    * commit was added to. */
  function mintCommit(uint256 amount, bool stake) external whenNotPaused nonReentrant {
    require(allowCommits, "adding commits disallowed");
    require(tx.origin == _msgSender(), "Only EOA");
    require(_pendingCommitId[_msgSender()] == 0, "Already have pending mints");
    uint16 minted = houseNFT.minted();
    uint256 maxTokens = houseNFT.getMaxTokens();
    require(minted + pendingMintAmt + amount <= maxTokens, "All tokens minted");
    require(amount > 0 && amount <= 10, "Invalid mint amount");

    uint256 totalCheddarCost = 0;
    // Loop through the amount of 
    for (uint i = 1; i <= amount; i++) {
      totalCheddarCost += mintCost(minted + pendingMintAmt + i, maxTokens);
    }
    if (totalCheddarCost > 0) {
      cheddarToken.burn(_msgSender(), totalCheddarCost);
      cheddarToken.updateOriginAccess();
    }
    uint16 amt = uint16(amount);
    _mintCommits[_msgSender()][randomizer.commitId()] = MintCommit(stake, amt);
    _pendingCommitId[_msgSender()] = randomizer.commitId();
    pendingMintAmt += amt;
    emit MintCommitted(_msgSender(), amount);
  }

  /** Reveal the commits for this user. This will be when the user gets their NFT, and can only be done when the commit id that
    * the user is pending for has been assigned a random seed. */
  function mintReveal() external whenNotPaused nonReentrant {
    require(tx.origin == _msgSender(), "Only EOA1");
    reveal(_msgSender());
  }

  function reveal(address addr) internal {
    uint16 commitIdCur = _pendingCommitId[addr];
    uint256 seed = randomizer.getCommitRandom(commitIdCur);
    require(commitIdCur > 0, "No pending commit");
    require(seed > 0, "random seed not set");
    uint16 minted = houseNFT.minted();
    MintCommit memory commit = _mintCommits[addr][commitIdCur];
    pendingMintAmt -= commit.amount;
    uint16[] memory tokenIds = new uint16[](commit.amount);
    uint16[] memory tokenIdsToStake = new uint16[](commit.amount);
    for (uint k = 0; k < commit.amount; k++) {
      minted++;
      // scramble the random so the steal / treasure mechanic are different per mint
      seed = uint256(keccak256(abi.encode(seed, addr)));
      address recipient = selectRecipient(seed);

      tokenIds[k] = minted;
      if (!commit.stake || recipient != addr) {
        houseNFT.mint(recipient, seed);
      } else {
        houseNFT.mint(address(habitat), seed);
        tokenIdsToStake[k] = minted;
      }
    }
    houseNFT.updateOriginAccess(tokenIds);
    if(commit.stake) {
      habitat.addManyHouseToStakingPool(addr, tokenIdsToStake);
    }
    delete _mintCommits[addr][commitIdCur];
    delete _pendingCommitId[addr];
    emit MintRevealed(addr, tokenIds.length);
  }

  /**
  * the first 25% are 80000 $CHEDDAR
  * the next 50% are 160000 $CHEDDAR
  * the next 25% are 320000 $WOOL
  * @param tokenId the ID to check the cost of to mint
  * @return the cost of the given token ID
  */
  function mintCost(uint256 tokenId, uint256 maxTokens) public pure returns (uint256) {
    if (tokenId <= maxTokens / 4) return 80000 ether;
    if (tokenId <= maxTokens * 3 / 4) return 160000 ether;
    return 320000 ether;
  }

  /** INTERNAL */

  /**
   * @param seed a random value to select a recipient from
   * @return the address of the recipient (either the minter or the Cat thief's owner)
   */
  function selectRecipient(uint256 seed) internal view returns (address) {
    if (((seed >> 245) % 8) != 0) return _msgSender(); // top 8 bits haven't been used
    address thief = habitat.randomCrazyCatOwner(seed >> 144); // 144 bits reserved for trait selection
    if (thief == address(0x0)) return _msgSender();
    return thief;
  }

  /** ADMIN */

  /**
   * enables owner to pause / unpause contract
   */
  function setPaused(bool _paused) external requireContractsSet onlyOwner {
    if (_paused) _pause();
    else _unpause();
  }



  function setAllowCommits(bool allowed) external onlyOwner {
    allowCommits = allowed;
  }

  /** Allow the contract owner to set the pending mint amount.
    * This allows any long-standing pending commits to be overwritten, say for instance if the max supply has been 
    *  reached but there are many stale pending commits, it could be used to free up those spaces if needed/desired by the community.
    * This function should not be called lightly, this will have negative consequences on the game. */
  function setPendingMintAmt(uint256 pendingAmt) external onlyOwner {
    pendingMintAmt = uint16(pendingAmt);
  }

  /**
  * enables an address to mint / burn
  * @param addr the address to enable
  */
  function addAdmin(address addr) external onlyOwner {
      admins[addr] = true;
  }

  /**
  * disables an address from minting / burning
  * @param addr the address to disbale
  */
  function removeAdmin(address addr) external onlyOwner {
      admins[addr] = false;
  }
}
// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (security/Pausable.sol)

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
// OpenZeppelin Contracts v4.4.0 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

// File: contracts/interfaces/IHabitat.sol



// SPDX-License-Identifier: MIT LICENSE 

pragma solidity ^0.8.0;

interface IHabitat {
  function addManyToStakingPool(address account, uint16[] calldata tokenIds) external;
  function addManyHouseToStakingPool(address account, uint16[] calldata tokenIds) external;
  function randomCatOwner(uint256 seed) external view returns (address);
  function randomCrazyCatOwner(uint256 seed) external view returns (address);
  function isOwner(uint256 tokenId, address owner) external view returns (bool);
}
// File: contracts/interfaces/IHouseTraits.sol



// SPDX-License-Identifier: MIT LICENSE 

pragma solidity ^0.8.0;

interface IHouseTraits {
  function tokenURI(uint256 tokenId) external view returns (string memory);
}
// File: contracts/interfaces/ICHEDDAR.sol



// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;

interface ICHEDDAR {
    function mint(address to, uint256 amount) external;
    function burn(address from, uint256 amount) external;
    function updateOriginAccess() external;
    function transferFrom(address sender, address recipient, uint256 amount) external returns(bool);
}
// File: contracts/interfaces/IHouse.sol



// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";

interface IHouse is IERC721Enumerable {
    
    // House NFT struct
    struct HouseStruct {
        uint8 roll; //0 - Shack, 1 - Ranch, 2 - Mansion
        uint8 body;
    }

    function getTokenWriteBlock(uint256 tokenId) external view returns(uint64);
    function mint(address recipient, uint256 seed) external;
    function burn(uint256 tokenId) external;
    function updateOriginAccess(uint16[] memory tokenIds) external;
    function isShack(uint256 tokenId) external view returns(bool);
    function isRanch(uint256 tokenId) external view returns(bool);
    function isMansion(uint256 tokenId) external view returns(bool);
    function getMaxTokens() external view returns (uint256);
    function getTokenTraits(uint256 tokenId) external view returns (HouseStruct memory);
    function minted() external view returns (uint16);

    function emitShackStakedEvent(address owner, uint256 tokenId) external;
    function emitRanchStakedEvent(address owner, uint256 tokenId) external;
    function emitMansionStakedEvent(address owner, uint256 tokenId) external;

    function emitShackUnStakedEvent(address owner, uint256 tokenId) external;
    function emitRanchUnStakedEvent(address owner, uint256 tokenId) external;
    function emitMansionUnStakedEvent(address owner, uint256 tokenId) external;

}
// File: contracts/interfaces/IRandomizer.sol



// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;

interface IRandomizer {
    function commitId() external view returns (uint16);
    function getCommitRandom(uint16 id) external view returns (uint256);
    function random() external returns (uint256);
    function sRandom(uint256 tokenId) external returns (uint256);
}
// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (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`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (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);
}