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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/vrf/VRFConsumerBaseV2.sol";
import "@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol";
import "@chainlink/contracts/src/v0.8/automation/AutomationCompatible.sol";

/* Error Codes */
error Raffle__NotEnoughETHEntered();
error Raffle__TransferFailed();
error Raffle__NotOpen();
error Raffle__UpkeepNotNeeded(uint256 currentBalance, uint256 numPlayers, uint256 raffleState);

/**@title A sample Raffle Contract
 * @author Siddharth Chauhan
 * @notice This contract is for creating an untamperable decentralized smart contract
 * @dev This implements the Chainlink VRF v2 and Chainlink Automation
 */
contract Raffle is VRFConsumerBaseV2, AutomationCompatibleInterface {
  /* Type Declarations */
  enum RaffleState {
    OPEN,
    CALCULATING
  } // uint256 0 = OPEN, 1 = CALCULATING

  /* State Variables */
  uint256 private immutable i_entranceFee;
  address payable[] private s_players; // Need payable address for alloting winning amount
  VRFCoordinatorV2Interface private immutable i_vrfCoordinator;
  bytes32 private immutable i_gasLane;
  uint64 private immutable i_subscriptionId;
  uint32 private immutable i_callbackGasLimit;
  uint16 private constant REQUEST_CONFIRMATIONS = 3;
  uint32 private constant NUM_WORDS = 1;

  /* Lottery Variables */
  address private s_recentWinner;
  RaffleState private s_raffleState;
  uint256 private s_lastTimeStamp;
  uint256 private immutable i_interval;

  /* Events */
  event RaffleEnter(address indexed player);
  event RequestedRaffleWinner(uint256 indexed requestId);
  event WinnerPicked(address indexed winner);

  /* Functions */
  constructor(
    address vrfCoordinatorV2,
    uint256 entranceFee,
    bytes32 gasLane,
    uint64 subscriptionId,
    uint32 callbackGasLimit,
    uint256 interval
  ) VRFConsumerBaseV2(vrfCoordinatorV2) {
    i_vrfCoordinator = VRFCoordinatorV2Interface(vrfCoordinatorV2);
    i_entranceFee = entranceFee;
    i_gasLane = gasLane;
    i_subscriptionId = subscriptionId;
    i_callbackGasLimit = callbackGasLimit;
    i_interval = interval;
    s_raffleState = RaffleState.OPEN; // or RaffleState(0)
    s_lastTimeStamp = block.timestamp;
  }

  function enterRaffle() public payable {
    if (msg.value < i_entranceFee) revert Raffle__NotEnoughETHEntered();
    if (s_raffleState != RaffleState.OPEN) revert Raffle__NotOpen();

    s_players.push(payable(msg.sender)); // Need payable address for alloting winning amount
    emit RaffleEnter(msg.sender); // Emit an event when we update a dynamic array or mapping
  }

  /**
   * @dev This is function is called by Chainlink Automation nodes.
   * They look for the 'upkeepNeeded' to return true.
   * The following should be true in order to return true:
   * 1. Our time interval should have passed.
   * 2. The lottery should have at least 1 player, and have some ETH.
   * 3. Our subscription is funded with LINK.
   * 4. The lottery should be in an "open" state.
   */
  function checkUpkeep(
    bytes memory /* checkData */
  ) public override returns (bool upkeepNeeded, bytes memory /* performData */) {
    bool isOpen = (RaffleState.OPEN == s_raffleState);
    bool timePassed = ((block.timestamp - s_lastTimeStamp) > i_interval);
    bool hasPlayers = (s_players.length > 0);
    bool hasBalance = address(this).balance > 0;

    upkeepNeeded = (isOpen && timePassed && hasPlayers && hasBalance);
  }

  // 'external' functions are cheaper, our own contract can't call it.
  // This function will be called by chainlink keepers
  function performUpkeep(bytes calldata /* performData */) external override {
    (bool upkeepNeeded, ) = checkUpkeep("");
    if (!upkeepNeeded) {
      revert Raffle__UpkeepNotNeeded(
        address(this).balance,
        s_players.length,
        uint256(s_raffleState)
      );
    }

    s_raffleState = RaffleState.CALCULATING; // Calculating State

    uint256 requestId = i_vrfCoordinator.requestRandomWords(
      i_gasLane, // keyHash / gasLane
      i_subscriptionId,
      REQUEST_CONFIRMATIONS,
      i_callbackGasLimit,
      NUM_WORDS
    );
    emit RequestedRaffleWinner(requestId); // This is redundant, 'requestId' gets emitted by VRFCoordinatorV2 also.
  }

  function fulfillRandomWords(
    uint256 /* requestId */,
    uint256[] memory randomWords
  ) internal override {
    uint256 indexOfWinner = randomWords[0] % s_players.length;
    address payable recentWinner = s_players[indexOfWinner];
    s_recentWinner = recentWinner; // Assigning new winner
    s_raffleState = RaffleState.OPEN; // OPEN State
    s_players = new address payable[](0); // Reset players array
    s_lastTimeStamp = block.timestamp;

    (bool success, ) = recentWinner.call{value: address(this).balance}(""); // Transfer the money to winner

    if (!success) revert Raffle__TransferFailed();
    emit WinnerPicked(recentWinner);
  }

  /* View / Pure Functions */
  function getEntranceFee() public view returns (uint256) {
    return i_entranceFee;
  }

  function getPlayer(uint256 index) public view returns (address) {
    return s_players[index];
  }

  function getRecentWinner() public view returns (address) {
    return s_recentWinner;
  }

  function getRaffleState() public view returns (RaffleState) {
    return s_raffleState;
  }

  function getNumWords() public pure returns (uint256) {
    return NUM_WORDS;
  }

  function getNumberOfPlayers() public view returns (uint256) {
    return s_players.length;
  }

  function getLastTimeStamp() public view returns (uint256) {
    return s_lastTimeStamp;
  }

  function getRequestConfirmations() public pure returns (uint256) {
    return REQUEST_CONFIRMATIONS;
  }

  function getInterval() public view returns (uint256) {
    return i_interval;
  }
}

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

contract AutomationBase {
  error OnlySimulatedBackend();

  /**
   * @notice method that allows it to be simulated via eth_call by checking that
   * the sender is the zero address.
   */
  function preventExecution() internal view {
    if (tx.origin != address(0)) {
      revert OnlySimulatedBackend();
    }
  }

  /**
   * @notice modifier that allows it to be simulated via eth_call by checking
   * that the sender is the zero address.
   */
  modifier cannotExecute() {
    preventExecution();
    _;
  }
}

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

import "./AutomationBase.sol";
import "./interfaces/AutomationCompatibleInterface.sol";

abstract contract AutomationCompatible is AutomationBase, AutomationCompatibleInterface {}

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

interface AutomationCompatibleInterface {
  /**
   * @notice method that is simulated by the keepers to see if any work actually
   * needs to be performed. This method does does not actually need to be
   * executable, and since it is only ever simulated it can consume lots of gas.
   * @dev To ensure that it is never called, you may want to add the
   * cannotExecute modifier from KeeperBase to your implementation of this
   * method.
   * @param checkData specified in the upkeep registration so it is always the
   * same for a registered upkeep. This can easily be broken down into specific
   * arguments using `abi.decode`, so multiple upkeeps can be registered on the
   * same contract and easily differentiated by the contract.
   * @return upkeepNeeded boolean to indicate whether the keeper should call
   * performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if
   * upkeep is needed. If you would like to encode data to decode later, try
   * `abi.encode`.
   */
  function checkUpkeep(bytes calldata checkData) external returns (bool upkeepNeeded, bytes memory performData);

  /**
   * @notice method that is actually executed by the keepers, via the registry.
   * The data returned by the checkUpkeep simulation will be passed into
   * this method to actually be executed.
   * @dev The input to this method should not be trusted, and the caller of the
   * method should not even be restricted to any single registry. Anyone should
   * be able call it, and the input should be validated, there is no guarantee
   * that the data passed in is the performData returned from checkUpkeep. This
   * could happen due to malicious keepers, racing keepers, or simply a state
   * change while the performUpkeep transaction is waiting for confirmation.
   * Always validate the data passed in.
   * @param performData is the data which was passed back from the checkData
   * simulation. If it is encoded, it can easily be decoded into other types by
   * calling `abi.decode`. This data should not be trusted, and should be
   * validated against the contract's current state.
   */
  function performUpkeep(bytes calldata performData) external;
}

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

interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig() external view returns (uint16, uint32, bytes32[] memory);

  /**
   * @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 the minimum subscription balance required for the selected keyHash.
   * @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
   * [0, 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 reqCount - number of requests for this subscription, determines fee tier.
   * @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, uint64 reqCount, 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 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;

  /*
   * @notice Check to see if there exists a request commitment consumers
   * for all consumers and keyhashes for a given sub.
   * @param subId - ID of the subscription
   * @return true if there exists at least one unfulfilled request for the subscription, false
   * otherwise.
   */
  function pendingRequestExists(uint64 subId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/** ****************************************************************************
 * @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     constructor(<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 private immutable 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);
  }
}

{
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    "runs": 200
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  "outputSelection": {
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[{"inputs":[{"internalType":"address","name":"vrfCoordinatorV2","type":"address"},{"internalType":"uint256","name":"entranceFee","type":"uint256"},{"internalType":"bytes32","name":"gasLane","type":"bytes32"},{"internalType":"uint64","name":"subscriptionId","type":"uint64"},{"internalType":"uint32","name":"callbackGasLimit","type":"uint32"},{"internalType":"uint256","name":"interval","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"have","type":"address"},{"internalType":"address","name":"want","type":"address"}],"name":"OnlyCoordinatorCanFulfill","type":"error"},{"inputs":[],"name":"Raffle__NotEnoughETHEntered","type":"error"},{"inputs":[],"name":"Raffle__NotOpen","type":"error"},{"inputs":[],"name":"Raffle__TransferFailed","type":"error"},{"inputs":[{"internalType":"uint256","name":"currentBalance","type":"uint256"},{"internalType":"uint256","name":"numPlayers","type":"uint256"},{"internalType":"uint256","name":"raffleState","type":"uint256"}],"name":"Raffle__UpkeepNotNeeded","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"player","type":"address"}],"name":"RaffleEnter","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"requestId","type":"uint256"}],"name":"RequestedRaffleWinner","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"winner","type":"address"}],"name":"WinnerPicked","type":"event"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"checkUpkeep","outputs":[{"internalType":"bool","name":"upkeepNeeded","type":"bool"},{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"enterRaffle","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"getEntranceFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getInterval","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLastTimeStamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getNumWords","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getNumberOfPlayers","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getPlayer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRaffleState","outputs":[{"internalType":"enum Raffle.RaffleState","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRecentWinner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRequestConfirmations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"performUpkeep","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"requestId","type":"uint256"},{"internalType":"uint256[]","name":"randomWords","type":"uint256[]"}],"name":"rawFulfillRandomWords","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000008103b0a8a00be2ddc778e6e7eaa21791cd364625000000000000000000000000000000000000000000000000002386f26fc10000474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c00000000000000000000000000000000000000000000000000000000000022b0000000000000000000000000000000000000000000000000000000000007a120000000000000000000000000000000000000000000000000000000000000001e

-----Decoded View---------------
Arg [0] : vrfCoordinatorV2 (address): 0x8103B0A8A00be2DDC778e6e7eaa21791Cd364625
Arg [1] : entranceFee (uint256): 10000000000000000
Arg [2] : gasLane (bytes32): 0x474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c
Arg [3] : subscriptionId (uint64): 8880
Arg [4] : callbackGasLimit (uint32): 500000
Arg [5] : interval (uint256): 30

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000008103b0a8a00be2ddc778e6e7eaa21791cd364625
Arg [1] : 000000000000000000000000000000000000000000000000002386f26fc10000
Arg [2] : 474e34a077df58807dbe9c96d3c009b23b3c6d0cce433e59bbf5b34f823bc56c
Arg [3] : 00000000000000000000000000000000000000000000000000000000000022b0
Arg [4] : 000000000000000000000000000000000000000000000000000000000007a120
Arg [5] : 000000000000000000000000000000000000000000000000000000000000001e