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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

/**
 * @title IPohVerifier
 * @notice Minimal interface for Linea's PoH verifier contract.
 *         Docs: https://docs.linea.build/get-started/how-to/verify-users-with-proof-of-humanity
 */
interface IPohVerifier {
    function verify(
        bytes memory signature,
        address human
    ) external view returns (bool);
}

/**
 * @title Ownable
 * @notice Simple Ownable implementation (no external dependencies).
 */
contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(msg.sender == _owner, "Ownable: caller is not the owner");
        _;
    }

    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @title ReentrancyGuardSimple
 * @notice Minimal nonReentrant modifier, updated for 0.8.x.
 */
contract ReentrancyGuardSimple {
    bool private _entered;

    modifier nonReentrant() {
        require(!_entered, "ReentrancyGuard: reentrant call");
        _entered = true;
        _;
        _entered = false;
    }
}

/**
 * @title CashCowGasStation
 * @notice PoH-gated gas faucet for Linea ETH.
 *         - Uses Linea's PoH signed status + PohVerifier contract.
 *         - 1 claim per 24 hours per human.
 *         - Faucet amount: 0.00004 ETH per claim.
 */
contract CashCowGasStation is Ownable, ReentrancyGuardSimple {
    /// @notice Claim cooldown (24 hours)
    uint256 public constant COOLDOWN = 1 days;

    /// @notice Amount of ETH (on Linea) sent per claim, in wei
    uint256 public faucetAmount;

    /// @notice Linea PoH verifier contract (mainnet)
    /// @dev Address from Linea docs / deployments
    IPohVerifier public pohVerifier = IPohVerifier(0xBf14cFAFD7B83f6de881ae6dc10796ddD7220831);

    /// @notice Last claim timestamp per address
    mapping(address => uint256) public lastClaim;

    event Claimed(address indexed user, uint256 amount);
    event FaucetAmountUpdated(uint256 newAmount);
    event PohVerifierUpdated(address newVerifier);
    event Refunded(address indexed to, uint256 amount);

    /**
     * @notice Constructor
     *         - Sets initial faucet amount to 40,000,000,000,000 wei (0.00004 ETH).
     */
    constructor() {
        faucetAmount = 40_000_000_000_000; // 0.00004 ETH
        emit FaucetAmountUpdated(faucetAmount);
        emit PohVerifierUpdated(address(pohVerifier));
    }

    /**
     * @notice Claim Linea gas if you are PoH verified and cooldown passed.
     * @param signature Signed PoH status from https://poh-signer-api.linea.build/poh/v2/{address}
     */
    function claim(bytes calldata signature) external nonReentrant {
        // Extra safety / silences static-analysis warnings
        require(msg.sender != address(0), "CashCowGasStation: invalid sender");

        // 1) Must be human according to Linea's PoH verifier
        bool isHuman = pohVerifier.verify(signature, msg.sender);
        require(isHuman, "CashCowGasStation: Not PoH verified");

        // 2) Enforce cooldown
        uint256 last = lastClaim[msg.sender];
        require(
            block.timestamp - last >= COOLDOWN,
            "CashCowGasStation: Already claimed in last 24h"
        );

        // 3) Check balance
        require(
            address(this).balance >= faucetAmount,
            "CashCowGasStation: Faucet empty"
        );

        // 4) Effects + transfer
        lastClaim[msg.sender] = block.timestamp;

        (bool ok, ) = msg.sender.call{value: faucetAmount}("");
        require(ok, "CashCowGasStation: Transfer failed");

        emit Claimed(msg.sender, faucetAmount);
    }

    /**
     * @notice View helper for frontends: next claim time (0 if ready now).
     */
    function nextClaimTime(address user) external view returns (uint256) {
        uint256 last = lastClaim[user];
        if (block.timestamp - last >= COOLDOWN) {
            return 0;
        }
        return last + COOLDOWN;
    }

    /**
     * @notice Owner can update faucet amount (in wei).
     */
    function setFaucetAmount(uint256 _amount) external onlyOwner {
        faucetAmount = _amount;
        emit FaucetAmountUpdated(_amount);
    }

    /**
     * @notice Owner can update the PoH verifier contract if Linea ever migrates it.
     */
    function setPohVerifier(address _pohVerifier) external onlyOwner {
        require(_pohVerifier != address(0), "CashCowGasStation: invalid verifier");
        pohVerifier = IPohVerifier(_pohVerifier);
        emit PohVerifierUpdated(_pohVerifier);
    }

    /**
     * @notice Allow the owner to withdraw funds.
     */
    function withdraw(uint256 amount) external onlyOwner {
        require(amount <= address(this).balance, "CashCowGasStation: not enough balance");
        (bool ok, ) = owner().call{value: amount}("");
        require(ok, "CashCowGasStation: withdraw failed");
        emit Refunded(owner(), amount);
    }

    /**
     * @notice Fund the faucet by sending Linea ETH directly.
     */
    receive() external payable {}
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": []
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newAmount","type":"uint256"}],"name":"FaucetAmountUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newVerifier","type":"address"}],"name":"PohVerifierUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Refunded","type":"event"},{"inputs":[],"name":"COOLDOWN","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"faucetAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastClaim","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"nextClaimTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pohVerifier","outputs":[{"internalType":"contract IPohVerifier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"setFaucetAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_pohVerifier","type":"address"}],"name":"setPohVerifier","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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