// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

pragma solidity ^0.6.0;

// Interface for our erc20 token
interface IMuseToken {
    function totalSupply() external view returns (uint256);

    function balanceOf(address tokenOwner)
        external
        view
        returns (uint256 balance);

    function allowance(address tokenOwner, address spender)
        external
        view
        returns (uint256 remaining);

    function transfer(address to, uint256 tokens)
        external
        returns (bool success);

    function approve(address spender, uint256 tokens)
        external
        returns (bool success);

    function transferFrom(
        address from,
        address to,
        uint256 tokens
    ) external returns (bool success);

    function mintingFinished() external view returns (bool);

    function mint(address to, uint256 amount) external;

    function burn(uint256 amount) external;

    function burnFrom(address account, uint256 amount) external;
}

pragma solidity ^0.6.0;

interface IVNFT {
    // function ownerOf(uint256 _tokenId) external view returns (address _owner);

    function totalSupply() external view returns (uint256);

    function fatality(uint256 _deadId, uint256 _tokenId) external;

    function buyAccesory(uint256 nftId, uint256 itemId) external;

    function claimMiningRewards(uint256 nftId) external;

    function addCareTaker(uint256 _tokenId, address _careTaker) external;

    function careTaker(uint256 _tokenId, address _user)
        external
        view
        returns (address _careTaker);

    function ownerOf(uint256 _tokenId) external view returns (address _owner);

    function itemPrice(uint256 itemId) external view returns (uint256 _amount);

    function getRewards(uint256 tokenId) external view returns (uint256);

    function timeUntilStarving(uint256 _tokenId)
        external
        view
        returns (uint256 _time);

    function lastTimeMined(uint256 _tokenId)
        external
        view
        returns (uint256 _time);

    function vnftScore(uint256 _tokenId) external view returns (uint256 _score);

    function vnftScore(uint256 _tokenId, address)
        external
        view
        returns (uint256 _score);
}

pragma solidity ^0.6.0;

// forked Wafflemkr NIFTY TOOLS
// github.com/verynifty/verynifty-tools/blob/master/contracts/NiftyTools.sol
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

import "./interfaces/IMuseToken.sol";
import "./interfaces/IVNFT.sol";

contract MultiVnft is Ownable {
    using SafeMath for uint256;

    bool paused = false;

    IVNFT public vnft;
    IMuseToken public muse;
    uint256 public maxIds = 20;

    constructor(IVNFT _vnft, IMuseToken _muse) public {
        vnft = _vnft;
        muse = _muse;
    }

    modifier notPaused() {
        require(!paused, "PAUSED");
        _;
    }

    /**
       @notice claim MUSE tokens from multiple vNFTs
        @dev contract should be whitelisted as caretaker beforehand
     */
    function claimMultiple(uint256[] calldata ids) external notPaused {
        require(ids.length <= maxIds, "Too much vNFT passed");

        for (uint256 i = 0; i < ids.length; i++) {
            require(vnft.ownerOf(ids[i]) == msg.sender);
            vnft.claimMiningRewards(ids[i]);
        }
        // Send muse to user
        require(muse.transfer(msg.sender, muse.balanceOf(address(this))));
    }

     function _checkReward(uint256[] memory _nftIds)
        public
        view
        returns (uint256 totalAmt)
    {
        for (uint256 i = 0; i < _nftIds.length; i++) {
            totalAmt = totalAmt.add(vnft.getRewards(_nftIds[i]));
        }
    }

    function _checkAmount(uint256[] memory _itemIds)
        public
        view
        returns (uint256 totalAmt)
    {
        for (uint256 i = 0; i < _itemIds.length; i++) {
            totalAmt = totalAmt.add(vnft.itemPrice(_itemIds[i]));
        }
    }

    /**
        @notice feed multiple vNFTs with items/gems
        @dev contract should be whitelisted as caretaker beforehand   
        @dev contract should have MUSE allowance  
     */
    function feedMultiple(uint256[] calldata ids, uint256[] calldata itemIds)
        external
        notPaused
    {
        require(ids.length <= maxIds, "Too much vNFT passed");
        uint256 museCost = _checkAmount(itemIds);
        require(
            muse.transferFrom(msg.sender, address(this), museCost),
            "MUSE:Items"
        );

        require(muse.approve(address(vnft), museCost), "MUSE:approve");

        for (uint256 i = 0; i < ids.length; i++) {
            require(vnft.ownerOf(ids[i]) == msg.sender);
            vnft.buyAccesory(ids[i], itemIds[i]);
        }
    }

    /** NIFTY TOOLS  */

    function setMaxIds(uint256 _maxIds) public onlyOwner {
        maxIds = _maxIds;
    }

    function pause(bool _paused) public onlyOwner {
        paused = _paused;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "compilationTarget": {
    "contracts/MultiVnft.sol": "MultiVnft"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}