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// SPDX‑License‑Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

/**
 * @title GuessTwoThirdsGame
 * @notice A blockchain implementation of the “two‑thirds of the average” game.
 *
 *  – Each unique address may join once per round by sending any positive amount of ETH.  
 *  – When the pseudo‑random stop condition is hit, the player whose guess is
 *    closest to ⌊2 / 3 × average⌋ wins the entire prize pool, minus a 1 % fee for the owner.  
 *  – If several players are equally close, the earliest participant wins.
 *
 * @dev  The minimum/maximum early‑stop threshold (`minX`, `maxX`) is chosen
 *       once at deployment, so the game designer can decide how quickly a
 *       round is expected to finish (e.g. 2–3 players, 5–10 players, etc.).
 */
contract GuessTwoThirdsGame is ReentrancyGuard {
    /* --------------------------------------------------------------------- */
    /*                              Data Types                               */
    /* --------------------------------------------------------------------- */

    struct Player {
        address addr;
        uint256 amount;
    }

    /* --------------------------------------------------------------------- */
    /*                            State Variables                            */
    /* --------------------------------------------------------------------- */

    Player[] public players;                 // List of current‑round players
    mapping(address => bool) public hasPlayed;

    uint256 public totalAmount;              // Total ETH in current round
    uint256 public gameId;                   // Incremented after every round
    address public immutable owner;          // Fee receiver (1 %)

    uint256 public immutable minX;           // Lower bound for stop threshold
    uint256 public immutable maxX;           // Upper bound for stop threshold

    /* --------------------------------------------------------------------- */
    /*                                 Events                                */
    /* --------------------------------------------------------------------- */

    event PlayerJoined(address indexed player, uint256 amount);
    event GameEnded(
        uint256 indexed gameId,
        address indexed winner,
        uint256 reward,
        uint256 guessTarget
    );

    /* --------------------------------------------------------------------- */
    /*                               Constructor                             */
    /* --------------------------------------------------------------------- */

    /**
     * @param _minX The smallest possible early‑stop threshold (≥ 1).
     * @param _maxX The largest  possible early‑stop threshold (≥ _minX).
     *
     * Example:  _minX=2, _maxX=3  ⇒  the game may stop after 2 or 3 players,
     *           giving an expected total of ~6–9 participants.
     */
    constructor(uint256 _minX, uint256 _maxX) {
        require(_minX > 0, "minX must be positive");
        require(_maxX >= _minX, "maxX must be >= minX");

        owner = msg.sender;
        gameId = 1;

        minX = _minX;
        maxX = _maxX;
    }

    /* --------------------------------------------------------------------- */
    /*                             Game Interface                            */
    /* --------------------------------------------------------------------- */

    /**
     * @notice Join the current round by sending ETH.
     * @dev    `nonReentrant` prevents re‑entrancy attacks.
     */
    function play() external payable nonReentrant {
        require(!hasPlayed[msg.sender], "You already played");
        require(msg.value > 0, "Must send ETH > 0");

        // Store participation
        players.push(Player(msg.sender, msg.value));
        hasPlayed[msg.sender] = true;
        totalAmount += msg.value;

        emit PlayerJoined(msg.sender, msg.value);

        // Possibly end the game
        if (_shouldEndGame(players.length)) {
            _endGame();
        }
    }

    /* --------------------------------------------------------------------- */
    /*                          Internal Game Logic                          */
    /* --------------------------------------------------------------------- */

    /**
     * @dev  Pseudo‑random stop condition.
     *       Picks x  ∈ [minX, maxX].  The round cannot end before x players
     *       have joined, and the actual end is decided randomly afterwards.
     */
    function _shouldEndGame(uint256 n) internal view returns (bool) {
        // Draw x in the inclusive interval [minX, maxX]
        uint256 x = minX +
            (uint256(
                keccak256(
                    abi.encodePacked(block.prevrandao, block.timestamp, n)
                )
            ) % (maxX - minX + 1));

        if (n < x) return false;                 // Too early to end

        // Second random check to decide whether to stop exactly at n players
        uint256 l = n > x ? n - x : 1;           // Lower bound
        uint256 r = n + x;                       // Upper bound
        uint256 y = l +
            (uint256(
                keccak256(
                    abi.encodePacked(blockhash(block.number - 1), msg.sender)
                )
            ) % (r - l + 1));

        return y == n;
    }

    /**
     * @dev Determines the winner, distributes prize & fee, and resets state.
     */
    function _endGame() internal {
        uint256 average = totalAmount / players.length;
        uint256 target = (average * 2) / 3;          // ⌊2/3 × average⌋

        // Earliest player wins ties
        address winner = players[0].addr;
        uint256 closestDiff = _absDiff(players[0].amount, target);

        for (uint256 i = 1; i < players.length; ++i) {
            uint256 diff = _absDiff(players[i].amount, target);
            if (diff < closestDiff) {
                winner = players[i].addr;
                closestDiff = diff;
            }
        }

        uint256 fee = totalAmount / 100;             // 1 % fee
        uint256 prize = totalAmount - fee;

        // Payouts (use call to forward all remaining gas)
        (bool okWinner, ) = payable(winner).call{value: prize}("");
        require(okWinner, "Prize transfer failed");

        (bool okOwner, ) = payable(owner).call{value: fee}("");
        require(okOwner, "Fee transfer failed");

        emit GameEnded(gameId, winner, prize, target);

        // Reset state for next round
        for (uint256 i = 0; i < players.length; ++i) {
            hasPlayed[players[i].addr] = false;
        }
        delete players;
        totalAmount = 0;
        ++gameId;
    }

    /* --------------------------------------------------------------------- */
    /*                         Pure / View Utilities                         */
    /* --------------------------------------------------------------------- */

    function _absDiff(uint256 a, uint256 b) private pure returns (uint256) {
        return a > b ? a - b : b - a;
    }

    /* --------------------------------------------------------------------- */

    // Accept ETH sent directly to the contract
    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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;

    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
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // 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;
    }
}

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

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[{"inputs":[{"internalType":"uint256","name":"_minX","type":"uint256"},{"internalType":"uint256","name":"_maxX","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"gameId","type":"uint256"},{"indexed":true,"internalType":"address","name":"winner","type":"address"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"guessTarget","type":"uint256"}],"name":"GameEnded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"player","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"PlayerJoined","type":"event"},{"inputs":[],"name":"gameId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"hasPlayed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxX","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minX","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":"play","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"players","outputs":[{"internalType":"address","name":"addr","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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-----Decoded View---------------
Arg [0] : _minX (uint256): 2
Arg [1] : _maxX (uint256): 3

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000003