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// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";

contract YCBGasManager is ReentrancyGuard {
    AggregatorV3Interface internal priceFeed;

    mapping(address => uint256) public userStakes;
    mapping(address => uint256) public pendingPayments;
    uint256 public ycbPrice = 3 ether;
    address public owner;
    uint256 public minimumStake;

    IERC20 public customToken;

    event Staked(address indexed user, uint256 amount);
    event Unstaked(address indexed user, uint256 amount);
    event GasPayment(address indexed user, uint256 gasValue);

    uint256 constant TOKEN_DECIMALS = 10**18;

    constructor(
        address _customToken,
        address _priceFeed,
        uint256 _minimumStake
    ) {
        owner = msg.sender;
        customToken = IERC20(_customToken);
        priceFeed = AggregatorV3Interface(_priceFeed);
        minimumStake = _minimumStake;
    }

    function updateMinimumStake(uint256 _minimumStake) public onlyOwner {
        minimumStake = _minimumStake;
    }

    function updateYCBPrice(uint256 _ycbPrice) public onlyOwner {
        ycbPrice = _ycbPrice;
    }

    function stake(uint256 amount) public nonReentrant {
        require(amount > 0, "Invalid stake amount");
        require(amount >= minimumStake, "Minimum stake is 0.1 ether");
        userStakes[msg.sender] += amount;
        customToken.transferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function unstake(uint256 amount) public nonReentrant {
        require(amount > 0, "Invalid unstake amount");
        require(userStakes[msg.sender] >= amount, "Insufficient staked amount");
        userStakes[msg.sender] -= amount;
        customToken.transfer(msg.sender, amount);
        emit Unstaked(msg.sender, amount);
    }

    function gasPendingPaymentYCB(address user, uint256 gasValue)
        external
        onlyOwner
        nonReentrant
    {
        require(user != address(0), "Invalid user address");
        require(gasValue > 0, "Invalid gas value");
        require(
            pendingPayments[user] == 0,
            "User still have outstanding payment"
        );

        uint256 ycbGasValue = getPriceFeedFromETHToYCB(gasValue);

        require(
            userStakes[user] >= ycbGasValue,
            "Insufficient balance for gas payment"
        );

        userStakes[user] -= ycbGasValue;
        pendingPayments[user] = ycbGasValue;
    }

    function gasPaymentYCB(address user, uint256 gasValue)
        external
        onlyOwner
        nonReentrant
        returns (uint256)
    {
        require(user != address(0), "Invalid user address");
        require(gasValue > 0, "Invalid gas value");

        uint256 ycbGasValueBeforeFee = getPriceFeedFromETHToYCB(gasValue);
        uint256 ycbGasValue = ycbGasValueBeforeFee +
            (ycbGasValueBeforeFee / 20);

        if (pendingPayments[user] > ycbGasValue) {
            // refund exceeding gas
            userStakes[user] += pendingPayments[user] - ycbGasValue;
        } else {
            // pay unpaid gas
            uint256 _unpaidGas = ycbGasValue - pendingPayments[user];

            require(
                userStakes[user] >= _unpaidGas,
                "balance not enough to pay gas"
            );

            userStakes[user] -= _unpaidGas;
        }

        customToken.transfer(owner, ycbGasValue);
        pendingPayments[user] = 0;
        emit GasPayment(user, ycbGasValue);
        return ycbGasValue;
    }

    function refundPendingPayment(address user) public onlyOwner {
        pendingPayments[user] = 0;
    }

    function getPriceFeedFromETHToYCB(uint256 ethValue)
        public
        view
        returns (uint256)
    {
        (, int256 price, , , ) = priceFeed.latestRoundData();
        uint256 NATIVE_TO_ETH = uint256(price);
        uint256 ETH_TO_NATIVE = TOKEN_DECIMALS / NATIVE_TO_ETH;
        uint256 nativeValuePrice = (ethValue * ETH_TO_NATIVE);
        uint256 ycbValuePrice = (nativeValuePrice * TOKEN_DECIMALS) / ycbPrice;
        return ycbValuePrice;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can perform this action");
        _;
    }
}

// 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);

  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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_customToken","type":"address"},{"internalType":"address","name":"_priceFeed","type":"address"},{"internalType":"uint256","name":"_minimumStake","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"gasValue","type":"uint256"}],"name":"GasPayment","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Unstaked","type":"event"},{"inputs":[],"name":"customToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"gasValue","type":"uint256"}],"name":"gasPaymentYCB","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"gasValue","type":"uint256"}],"name":"gasPendingPaymentYCB","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"ethValue","type":"uint256"}],"name":"getPriceFeedFromETHToYCB","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minimumStake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"pendingPayments","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"refundPendingPayment","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_minimumStake","type":"uint256"}],"name":"updateMinimumStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_ycbPrice","type":"uint256"}],"name":"updateYCBPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userStakes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ycbPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000088f4532991b92875022ce498236229cf94f97582000000000000000000000000327e23a4855b6f663a28c5161541d69af8973302000000000000000000000000000000000000000000000000016345785d8a0000

-----Decoded View---------------
Arg [0] : _customToken (address): 0x88F4532991b92875022ce498236229CF94f97582
Arg [1] : _priceFeed (address): 0x327e23A4855b6F663a28c5161541d69Af8973302
Arg [2] : _minimumStake (uint256): 100000000000000000

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000088f4532991b92875022ce498236229cf94f97582
Arg [1] : 000000000000000000000000327e23a4855b6f663a28c5161541d69af8973302
Arg [2] : 000000000000000000000000000000000000000000000000016345785d8a0000