interface INFTStaker is IERC165 {

  struct Reward {
    address minter;
    uint256 amount;
    uint256 startBlock;
    uint256 endBlock;
    bool isStaked;
  }

  function rewardRecords(uint256 id) external view returns (address, uint256, uint256, uint256, bool);

  /**
    * @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;

  /**
    * @dev Burns `tokenId`. See {ERC721-_burn}.
    *
    * Requirements:
    *
    * - The caller must own `tokenId` or be an approved operator.
    */
  function burn(uint256 tokenId) external; 
}
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
function approve(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.
 */