Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
interface IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
interface IERC1155 is IERC165 {
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    event URI(string value, uint256 indexed id);

    function balanceOf(address account, uint256 id) external view returns (uint256);
    function balanceOfBatch(
        address[] calldata accounts,
        uint256[] calldata ids
    ) external view returns (uint256[] memory);

    function setApprovalForAll(address operator, bool approved) external;
    function isApprovedForAll(address account, address operator) external view returns (bool);
    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external;
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}


interface IERC1155Receiver is IERC165 {

    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}


interface IERC1155MetadataURI is IERC1155 {
  
    function uri(uint256 id) external view returns (string memory);
}

pragma solidity ^0.8.1;

library Address {
   
    function isContract(address account) internal view returns (bool) {

        return account.code.length > 0;
    }

    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");
    }

 
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
 
    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");
    }

    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);
    }

    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    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);
    }

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    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);
    }

    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);
        }
    }

    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);
        }
    }
}


abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

interface IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    function balanceOf(address owner) external view returns (uint256 balance);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    function approve(address to, uint256 tokenId) external;

    function getApproved(uint256 tokenId) external view returns (address operator);


    function setApprovalForAll(address operator, bool _approved) external;


    function isApprovedForAll(address owner, address operator) external view returns (bool);

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
interface INFT 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);
}


interface ITheBerps is INFT {
    function mintTo(address to) external;
}

interface ISnacks is IERC1155 {
    function feedDerp(uint256 snackId, uint256 amount, uint256 derpId) external;
}
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);
    }
}


abstract contract ERC1155Holder 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);
    }

    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;
    }
}

contract FeedingContract is Ownable, ERC1155Holder {
    ITheBerps public berps;
    INFT public derps;
    ISnacks public snacks;

    uint256 public constant INITIAL_HUNGER = 3200;
    uint256 public cooldown = 24 hours;
    bool public isLive = false;

    mapping(uint256 => uint256) public hungerScore; // snackId → hunger reduction
    mapping(uint256 => uint256) public hungerLevel; // derpId → current hunger
    mapping(uint256 => uint256) public lastBerpTimestamp; // derpId → last Berp mint time

    event DerpFed(address indexed feeder, uint256 derpId, uint256 snackId, uint256 newHunger);
    event BerpMinted(address indexed recipient, uint256 derpId, uint256 timestamp);

    constructor(address _berps, address _derps, address _snacks) {
        berps = ITheBerps(_berps);
        derps = INFT(_derps);
        snacks = ISnacks(_snacks);
    }

    /**
     * @dev Sets the hunger score for a specific Snack ID. Only callable by the owner.
     * @param snackId The ID of the snack.
     * @param score The hunger reduction value.
     */
    function setHungerScore(uint256 snackId, uint256 score) external onlyOwner {
        hungerScore[snackId] = score;
    }

    function setCooldown(uint256 newCooldown) external onlyOwner {
        cooldown = newCooldown;
    }

    function toggleFeeding() external onlyOwner {
        if (isLive) {
            isLive = false;
        }
        else {
            isLive = true;
        }
    }

    /**
     * @dev Feeds a Snack to a Derp, reducing its hunger level. If hunger reaches 0, mints a Berp.
     * @param derpId The ID of the Derp being fed.
     * @param snackId The ID of the Snack being used.
     */
    function feedDerp(
        uint256 snackId, 
        uint256 amount, 
        uint256 derpId
    ) external {
        require(isLive,"feeding is not live");
        require(
            block.timestamp >= lastBerpTimestamp[derpId] + cooldown, 
            "Derp is on cooldown");
        require(
            hungerScore[snackId] > 0, 
            "Invalid snack");

        // Initialize hunger if not set
        if (hungerLevel[derpId] == 0) {
            hungerLevel[derpId] = INITIAL_HUNGER;
        }

        snacks.safeTransferFrom(
            msg.sender,
            address(this),
            snackId,
            amount,
            bytes("")); 
        snacks.feedDerp(snackId, amount, derpId);

        // Reduce hunger
        uint256 newHunger = hungerLevel[derpId] > hungerScore[snackId] 
            ? hungerLevel[derpId] - hungerScore[snackId] 
            : 0;

        hungerLevel[derpId] = newHunger;

        emit DerpFed(msg.sender, derpId, snackId, newHunger);

        // If hunger reaches zero, mint a Berp and start cooldown
        if (newHunger == 0) {
            berps.mintTo(msg.sender);
            lastBerpTimestamp[derpId] = block.timestamp; // Start cooldown
            emit BerpMinted(msg.sender, derpId, block.timestamp);
        }
    }
}