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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/**
 * @title IPohVerifier
 * @dev Interface for Linea's official Proof of Humanity Verifier contract
 * @notice Contract address: 0xBf14cFAFD7B83f6de881ae6dc10796ddD7220831
 */
interface IPohVerifier {
    /**
     * @dev Verifies if an address has Proof of Humanity status
     * @param signature The signed message from the PoH signer API
     * @param human The address to verify
     * @return bool True if the address is verified, false otherwise
     */
    function verify(bytes memory signature, address human) external view returns (bool);
}

/**
 * @title DailyGM
 * @dev A contract that allows users to say "GM" (Good Morning) with a daily transaction limit
 * Includes ownership functionality and Proof of Humanity verification using Linea's official PohVerifier
 */
contract DailyGM {
    // Owner of the contract
    address private _owner;
    
    // Linea's official PohVerifier contract
    IPohVerifier public immutable pohVerifier;
    
    // Maximum transactions per user per day
    uint256 public constant MAX_DAILY_TRANSACTIONS = 10;
    
    // Struct to track user's daily activity
    struct DailyActivity {
        uint256 lastResetDay;
        uint256 transactionCount;
    }
    
    // Mapping from user address to their daily activity
    mapping(address => DailyActivity) public userActivity;
    
    // Array to store all GM messages
    struct GMMessage {
        address sender;
        string message;
        uint256 timestamp;
    }
    
    GMMessage[] public gmMessages;
    
    // Events
    event GMSaid(address indexed sender, string message, uint256 timestamp);
    event DailyLimitReached(address indexed sender, uint256 day);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
    // Errors
    error PohVerificationFailed(address sender);
    
    // Modifiers
    modifier onlyOwner() {
        require(msg.sender == _owner, "Caller is not the owner");
        _;
    }
    
    modifier onlyVerified(bytes memory pohSignature) {
        if (!pohVerifier.verify(pohSignature, msg.sender)) {
            revert PohVerificationFailed(msg.sender);
        }
        _;
    }
    
    /**
     * @dev Constructor sets the original owner and PohVerifier contract address
     * @param _pohVerifier Address of Linea's official PohVerifier contract (0xBf14cFAFD7B83f6de881ae6dc10796ddD7220831)
     */
    constructor(address _pohVerifier) {
        require(_pohVerifier != address(0), "Invalid PohVerifier address");
        _owner = msg.sender;
        pohVerifier = IPohVerifier(_pohVerifier);
        emit OwnershipTransferred(address(0), msg.sender);
    }
    
    /**
     * @dev Get the current day number (days since Unix epoch)
     */
    function getCurrentDay() public view returns (uint256) {
        return block.timestamp / 1 days;
    }
    
    /**
     * @dev Check if user has reached their daily limit
     */
    function hasReachedDailyLimit(address user) public view returns (bool) {
        DailyActivity memory activity = userActivity[user];
        uint256 currentDay = getCurrentDay();
        
        // If it's a new day, limit hasn't been reached
        if (activity.lastResetDay < currentDay) {
            return false;
        }
        
        // Check if user has reached the limit today
        return activity.transactionCount >= MAX_DAILY_TRANSACTIONS;
    }
    
    /**
     * @dev Get remaining transactions for the day
     */
    function getRemainingTransactions(address user) public view returns (uint256) {
        DailyActivity memory activity = userActivity[user];
        uint256 currentDay = getCurrentDay();
        
        // If it's a new day, return max transactions
        if (activity.lastResetDay < currentDay) {
            return MAX_DAILY_TRANSACTIONS;
        }
        
        // Calculate remaining transactions
        if (activity.transactionCount >= MAX_DAILY_TRANSACTIONS) {
            return 0;
        }
        
        return MAX_DAILY_TRANSACTIONS - activity.transactionCount;
    }
    
    /**
     * @dev Say GM with an optional custom message
     * @notice Requires user to be verified with Proof of Personhood
     * @param customMessage Optional custom message to include with GM
     * @param pohSignature Signed PoH status from https://poh-signer-api.linea.build/poh/v2/{address}
     */
    function sayGM(string memory customMessage, bytes memory pohSignature) public onlyVerified(pohSignature) {
        require(!hasReachedDailyLimit(msg.sender), "Daily transaction limit reached");
        
        uint256 currentDay = getCurrentDay();
        DailyActivity storage activity = userActivity[msg.sender];
        
        // Reset counter if it's a new day
        if (activity.lastResetDay < currentDay) {
            activity.lastResetDay = currentDay;
            activity.transactionCount = 0;
        }
        
        // Increment transaction count
        activity.transactionCount++;
        
        // Create message
        string memory message = bytes(customMessage).length > 0 
            ? customMessage 
            : "GM!";
        
        // Store the GM message
        gmMessages.push(GMMessage({
            sender: msg.sender,
            message: message,
            timestamp: block.timestamp
        }));
        
        emit GMSaid(msg.sender, message, block.timestamp);
        
        // Emit event if limit reached
        if (activity.transactionCount >= MAX_DAILY_TRANSACTIONS) {
            emit DailyLimitReached(msg.sender, currentDay);
        }
    }
    
    /**
     * @dev Get total number of GM messages
     */
    function getTotalGMs() public view returns (uint256) {
        return gmMessages.length;
    }
    
    /**
     * @dev Get GM message by index
     */
    function getGMMessage(uint256 index) public view returns (
        address sender,
        string memory message,
        uint256 timestamp
    ) {
        require(index < gmMessages.length, "Index out of bounds");
        GMMessage memory gm = gmMessages[index];
        return (gm.sender, gm.message, gm.timestamp);
    }
    
    /**
     * @dev Get recent GM messages (last N messages)
     */
    function getRecentGMs(uint256 count) public view returns (GMMessage[] memory) {
        uint256 totalMessages = gmMessages.length;
        uint256 returnCount = count > totalMessages ? totalMessages : count;
        
        GMMessage[] memory recentMessages = new GMMessage[](returnCount);
        
        for (uint256 i = 0; i < returnCount; i++) {
            recentMessages[i] = gmMessages[totalMessages - returnCount + i];
        }
        
        return recentMessages;
    }
    
    /**
     * @dev Get user's transaction count for today
     */
    function getUserDailyCount(address user) public view returns (uint256) {
        DailyActivity memory activity = userActivity[user];
        uint256 currentDay = getCurrentDay();
        
        // If it's a new day, return 0
        if (activity.lastResetDay < currentDay) {
            return 0;
        }
        
        return activity.transactionCount;
    }
    
    /**
     * @dev Returns the address of the current owner
     */
    function owner() public view returns (address) {
        return _owner;
    }
    
    /**
     * @dev Transfers ownership of the contract to a new account
     * Can only be called by the current owner
     */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "New owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * onlyOwner functions anymore. Can only be called by the current owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    
    /**
     * @dev Check if a user is verified using the official PohVerifier
     * @param user The address to check
     * @param pohSignature Signed PoH status from https://poh-signer-api.linea.build/poh/v2/{address}
     * @return bool True if the user is verified, false otherwise
     */
    function isUserVerified(address user, bytes memory pohSignature) public view returns (bool) {
        return pohVerifier.verify(pohSignature, user);
    }
}

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

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000000000000000000000000bf14cfafd7b83f6de881ae6dc10796ddd7220831

-----Decoded View---------------
Arg [0] : _pohVerifier (address): 0xBf14cFAFD7B83f6de881ae6dc10796ddD7220831

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000bf14cfafd7b83f6de881ae6dc10796ddd7220831