// File: MyFundStorage.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import "LinkTokenInterface.sol";
import "VRFCoordinatorV2Interface.sol";
import "VRFConsumerBaseV2.sol";
import "Ownable.sol";
import "EthUsPriceConversion.sol";

contract MyFundStorage is VRFConsumerBaseV2, Ownable {

    address payable[] internal payers;

    EthUsPriceConversion internal ethUsConvert;

    enum FUNDING_STATE {
        OPEN,
        END,
        CLOSED
    }
    FUNDING_STATE internal funding_state;

    VRFCoordinatorV2Interface COORDINATOR;
    LinkTokenInterface LINKTOKEN;

    // VRF subscription ID.
   // uint64 subscriptionId;
    uint64 subscriptionId;

    // The gas lane to use, which specifies the maximum gas price to bump to.
    bytes32 keyHash;

    // Minimum Entry Fee to fund
    uint256 minimumEntreeFee;

    // Storing each word costs about 20,000 gas,
    // so 100,000 is a safe default for this example contract. 
    uint32 callbackGasLimit;

    // The default is 3.
    uint16 requestConfirmations = 3;

    // For this example, retrieve 2 random values in one request.
    // Cannot exceed VRFCoordinatorV2.MAX_NUM_WORDS.
    uint32 numWords = 2;

    uint256[] randomWords;
    uint256 requestId;
    address s_owner;
 
    event ReturnedRandomness_Funding_begin(uint256 requestId);
    event ReturnedRandomness_Funding_end(uint256 requestId);
    event ReturnedRandomness_endFunding_begin(uint256 requestId);
    event ReturnedRandomness_endFunding_end(uint256 requestId);
    event ReturnedRandomness_withdraw_begin(uint256 requestId);
    event ReturnedRandomness_withdraw_end(uint256 requestId);
    event ReturnedRandomness_fulfill_begin(uint256 requestId);
    event ReturnedRandomness_fulfill_end(uint256 requestId);
    event ReturnedRandomness_requestRandomWord_begin(uint256 requestId);
    event ReturnedRandomness_requestRandomWord_end(uint256 requestId);
    
    /**
     * @notice Constructor inherits VRFConsumerBaseV2
     *
     * @param _subscriptionId - the subscription ID that this contract uses for funding requests
     * @param _vrfCoordinator - coordinator
     * @param _keyHash - the gas lane to use, which specifies the maximum gas price to bump to
     */
    constructor(
        address _priceFeedAddress,
        uint256 _minimumEntreeFee,
        uint64 _subscriptionId,
        uint32 _callbackGasLimit,
        address _vrfCoordinator,
        address _link,
        bytes32 _keyHash
    ) VRFConsumerBaseV2(_vrfCoordinator) payable{
        COORDINATOR = VRFCoordinatorV2Interface(_vrfCoordinator);
        LINKTOKEN = LinkTokenInterface(_link);
        minimumEntreeFee = _minimumEntreeFee;
        ethUsConvert = new EthUsPriceConversion(_priceFeedAddress, minimumEntreeFee);
        keyHash = _keyHash;
        callbackGasLimit = _callbackGasLimit;
        s_owner = msg.sender;
        subscriptionId = _subscriptionId;
        funding_state = FUNDING_STATE.CLOSED;
    }

    /**
     * @notice Get the current Ethereum market price in Wei
     */
    function getETHprice() external view returns (uint256) {
       return ethUsConvert.getETHprice();
    }

    /**
     * @notice Get the current Ethereum market price in US Dollar
     */
    function getETHpriceUSD() external view returns (uint256) {
        return ethUsConvert.getETHpriceUSD();
    }

    /**
     * @notice Get the minimum funding amount which is $50
     */
    function getEntranceFee() external view returns (uint256) {
        return ethUsConvert.getEntranceFee();
    }

    /**
     * @notice Update the gas limit for callback function 
     */
    function updateCallbackGasLimit(uint32 gasLimit) external onlyOwner {
        callbackGasLimit = gasLimit;
    }

    /**
     * @notice Update minimum funding amount
     */
    function updateMinimumEntryFee(uint256 min_Entree_Fee) external onlyOwner {
        minimumEntreeFee = min_Entree_Fee;
    }

    /**
     * @notice Update the funding state
     */
    function updateFundingState(FUNDING_STATE _funding_state) external onlyOwner {
        funding_state = _funding_state;
    }

    /**
     * @notice Get the Random RequestID from Chainlink
     */
    function getRandomRequestID() external view returns (uint256) {
        return requestId;
    }

    /**
     * @notice Get the First Random Word Response from Chainlink
     */
    function getFirstRandomWord() external view returns (uint256) {
        return randomWords[0];
    }

    /**
     * @notice Get the Second Random Word Response from Chainlink
     */
    function getSecondRandomWord() external view returns (uint256) {
        return randomWords[1];
    }

    /**
     * @notice Open the funding account.  Users can start funding now.
     */
    function startFunding() external onlyOwner {
        require(
            funding_state == FUNDING_STATE.CLOSED,
            "Can't start a new fund yet! Current funding is not closed yet!"
        );
        funding_state = FUNDING_STATE.OPEN;
    }

    /**
     * @notice User can enter the fund.  Minimum $50 value of ETH.
     */
    function fund() external payable {
        // $50 minimum
        emit ReturnedRandomness_Funding_begin(requestId);
        require(funding_state == FUNDING_STATE.OPEN, "Can't fund yet.  Funding is not opened yet.");
        require(msg.value >= ethUsConvert.getEntranceFee(), "Not enough ETH! Minimum $50 value of ETH require!");
        payers.push(payable(msg.sender));
        emit ReturnedRandomness_Funding_end(requestId);
    }

    /**
     * @notice Get current funding state.
     */
    function getCurrentFundingState() external view returns (FUNDING_STATE) {
        return funding_state;
    }

    /**
     * @notice Get the total amount that users funding in this account.
     */
    function getUsersTotalAmount() external view returns (uint256) {
        return address(this).balance;
    }

    /**
     * @notice Funding is ended.
     */
    function endFunding() external onlyOwner {
        emit ReturnedRandomness_endFunding_begin(requestId);
        require(funding_state == FUNDING_STATE.OPEN, "Funding is not opened yet.");
        funding_state = FUNDING_STATE.END;
        emit ReturnedRandomness_endFunding_end(requestId);
    }

    /**
     * @notice Owner withdraw the funding.
     */
    function withdraw() external onlyOwner {
        emit ReturnedRandomness_withdraw_begin(requestId);
        require(
            funding_state == FUNDING_STATE.END,
            "Funding must be ended before withdraw!"
        );
        requestRandomWords();
        funding_state = FUNDING_STATE.CLOSED;
        emit ReturnedRandomness_withdraw_end(requestId);
    }

    /**
     * @notice Owner withdraw the funding.
     */
    function withdraw2() external onlyOwner {
        emit ReturnedRandomness_withdraw_begin(requestId);
        require(
            funding_state == FUNDING_STATE.END,
            "Funding must be ended before withdraw!"
        );
        payable(s_owner).transfer(address(this).balance);
        payers = new address payable[](0);
        funding_state = FUNDING_STATE.CLOSED;
        emit ReturnedRandomness_withdraw_end(requestId);
    }


    /**
    * @notice Requests randomness
    * Assumes the subscription is funded sufficiently; "Words" refers to unit of data in Computer Science
     */
    function requestRandomWords() internal {
    // Will revert if subscription is not set and funded.
        emit ReturnedRandomness_requestRandomWord_begin(requestId);
        requestId = COORDINATOR.requestRandomWords(
        keyHash,
        subscriptionId,
        requestConfirmations,
        callbackGasLimit,
        numWords
        );
        emit ReturnedRandomness_requestRandomWord_end(requestId);
    }

    /*
    * @notice Callback function used by VRF Coordinator
    *
    * @param requestId - id of the request
    * @param randomWords - array of random results from VRF Coordinator
    */
    function fulfillRandomWords(
    uint256, /* requestId */
    uint256[] memory _randomWords
    ) internal override { 
        emit ReturnedRandomness_fulfill_begin(requestId);
        randomWords = _randomWords;

        payable(s_owner).transfer(address(this).balance);
        payers = new address payable[](0);
        funding_state = FUNDING_STATE.CLOSED;
        emit ReturnedRandomness_fulfill_end(requestId);
    }
  }
// File: LinkTokenInterface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {

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

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

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

  function decimals()
    external
    view
    returns (
      uint8 decimalPlaces
    );

  function decreaseApproval(
    address spender,
    uint256 addedValue
  )
    external
    returns (
      bool success
    );

  function increaseApproval(
    address spender,
    uint256 subtractedValue
  ) external;

  function name()
    external
    view
    returns (
      string memory tokenName
    );

  function symbol()
    external
    view
    returns (
      string memory tokenSymbol
    );

  function totalSupply()
    external
    view
    returns (
      uint256 totalTokensIssued
    );

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

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    returns (
      bool success
    );

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

}

// File: VRFCoordinatorV2Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface VRFCoordinatorV2Interface {

  /**
   * @notice Returns the global config that applies to all VRF requests.
   * @return minimumRequestBlockConfirmations - A minimum number of confirmation
   * blocks on VRF requests before oracles should respond.
   * @return fulfillmentFlatFeeLinkPPM - The charge per request on top of the gas fees.
   * Its flat fee specified in millionths of LINK.
   * @return maxGasLimit - The maximum gas limit supported for a fulfillRandomWords callback.
   * @return stalenessSeconds - How long we wait until we consider the ETH/LINK price
   * (used for converting gas costs to LINK) is stale and use `fallbackWeiPerUnitLink`
   * @return gasAfterPaymentCalculation - How much gas is used outside of the payment calculation,
   * i.e. the gas overhead of actually making the payment to oracles.
   * @return minimumSubscriptionBalance - The minimum subscription balance required to make a request. Its set to be about 300%
   * of the cost of a single request to handle in ETH/LINK price between request and fulfillment time.
   * @return fallbackWeiPerUnitLink - fallback ETH/LINK price in the case of a stale feed.
   */
  function getConfig()
  external
  view
  returns (
    uint16 minimumRequestBlockConfirmations,
    uint32 fulfillmentFlatFeeLinkPPM,
    uint32 maxGasLimit,
    uint32 stalenessSeconds,
    uint32 gasAfterPaymentCalculation,
    uint96 minimumSubscriptionBalance,
    int256 fallbackWeiPerUnitLink
  );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with at least minimumSubscriptionBalance (see getConfig) LINK
   * before making a request.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [5000, maxGasLimit].
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64  subId,
    uint16  minimumRequestConfirmations,
    uint32  callbackGasLimit,
    uint32  numWords
  )
    external
    returns (
      uint256 requestId
    );

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription()
    external
    returns (
      uint64 subId
    );

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return owner - Owner of the subscription
   * @return consumers - List of consumer address which are able to use this subscription.
   */
  function getSubscription(
    uint64 subId
  )
    external
    view
    returns (
      uint96 balance,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(
    uint64 subId,
    address newOwner
  )
    external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(
    uint64 subId
  )
    external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(
    uint64 subId,
    address consumer
  )
    external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(
    uint64 subId,
    address consumer
  )
    external;

  /**
   * @notice Withdraw funds from a VRF subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the withdrawn LINK to
   * @param amount - How much to withdraw in juels
   */
  function defundSubscription(
    uint64 subId,
    address to,
    uint96 amount
  )
    external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(
    uint64 subId,
    address to
  )
    external;
}

// File: VRFConsumerBaseV2.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
  error OnlyCoordinatorCanFulfill(address have, address want);
  address immutable private vrfCoordinator;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(
    address _vrfCoordinator
  )
  {
      vrfCoordinator = _vrfCoordinator;
  }

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  function fulfillRandomWords(
    uint256 requestId,
    uint256[] memory randomWords
  )
    internal virtual;

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(
    uint256 requestId,
    uint256[] memory randomWords
  )
    external
  {
    if (msg.sender != vrfCoordinator) {
      revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
    }
    fulfillRandomWords(requestId, randomWords);
  }
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "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: 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: EthUsPriceConversion.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

// Get the latest ETH/USD price from chainlink price feed
import "AggregatorV3Interface.sol";

contract EthUsPriceConversion {

    uint256 internal usdEntryFee;
    AggregatorV3Interface internal ethUsdPriceFeed;

    constructor(
        address _priceFeedAddress,
        uint256 minumum_entry_fee
    ) {
        ethUsdPriceFeed = AggregatorV3Interface(_priceFeedAddress);
        usdEntryFee = minumum_entry_fee * (10**18);
    }

    /**
     * @notice Get the current Ethereum market price in Wei
     */
    function getETHprice() external view returns (uint256) {
       (, int256 price, , , ) = ethUsdPriceFeed.latestRoundData();
        uint256 adjustedPrice = uint256(price) * 10**10; // 18 decimals
        return adjustedPrice;
    }

    /**
     * @notice Get the current Ethereum market price in US Dollar
     * 1000000000
     */
    function getETHpriceUSD() external view returns (uint256) {
        uint256 ethPrice = this.getETHprice();
        uint256 ethAmountInUsd = ethPrice / 1000000000000000000;
        // the actual ETH/USD conversation rate, after adjusting the extra 0s.
        return ethAmountInUsd;
    }

    /**
     * @notice Get the minimum funding amount which is $50
     */
    function getEntranceFee() external view returns (uint256) {
        uint256 adjustedPrice = this.getETHprice();

        // $50, $2,000 / ETH
        // 50/2,000
        // 50 * 100000 / 2000
        uint256 costToEnter = (usdEntryFee * 10**18) / adjustedPrice;
        return costToEnter;
    }
}
// File: AggregatorV3Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {

  function decimals()
    external
    view
    returns (
      uint8
    );

  function description()
    external
    view
    returns (
      string memory
    );

  function version()
    external
    view
    returns (
      uint256
    );

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(
    uint80 _roundId
  )
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}