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

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title DuckRaceCommitReveal
 * @notice Demonstration of a single-race "commit-reveal" game:
 *         - Each race: 1 minute commit phase, 1 minute reveal phase, then finalize winners.
 *         - At least 2 unique addresses to have a valid race.
 *         - Up to 100 players max.
 *         - Each deposit must be a whole number of "Sonic" (1,2,3... ETH).
 *         - Once race ends, 90% of the pot goes to the winner, 10% to the dev.
 *         - If contract balance >= 60 ETH, automatically sends 50 ETH to dev (to minimize honeypot).
 *         - 3-minute cooldown between races for better user experience.
 *
 * WARNING:
 *   - Commit-reveal is still partially vulnerable if participants "refuse to reveal" or collude.
 *   - Not audited. Thoroughly test before production.
 */
contract DuckRaceCommitReveal is ReentrancyGuard, Pausable, Ownable {
    // RACE timing constants
    uint256 public constant COMMIT_PHASE_DURATION = 60;  // 1 minute commit
    uint256 public constant REVEAL_PHASE_DURATION = 60;  // 1 minute reveal
    uint256 public constant COOLDOWN_DURATION     = 180; // 3 minute wait between races

    // Participation constraints
    uint256 public constant MIN_PLAYERS = 2;
    uint256 public constant MAX_PLAYERS = 100;

    // Whole number deposit logic => 1 Sonic = 1 ETH in this example
    // Payout distribution
    uint256 public constant WINNER_PERCENT = 90; // 90% to winner
    uint256 public constant DEV_FEE_PERCENT = 10; // 10% to dev

    // Threshold logic
    uint256 public constant THRESHOLD_BALANCE = 60 ether; // if contract >= 60,
    uint256 public constant THRESHOLD_PAYOUT  = 50 ether; // pay 50 to dev

    // Race phases
    enum RaceStatus { NotStarted, Commit, Reveal, Finished }

    struct PlayerData {
        // The hash the player committed (keccak256(seed, secretSalt, address, etc.))
        bytes32 commitHash;
        // How many ETH (Sonic) deposited
        uint256 deposit;
        // The revealed seed (once they reveal)
        uint256 revealedSeed;
        // Has the player actually revealed?
        bool    hasRevealed;
    }

    struct Race {
        uint256 raceId;
        RaceStatus status;
        uint256 commitEndTime;
        uint256 revealEndTime;
        address[] players; // list of participants
        mapping(address => PlayerData) playerInfo;
        bool isPaidOut;
        address winner;
    }

    mapping(uint256 => Race) public races;
    uint256 public currentRaceId;
    uint256 public lastRaceFinishTime; // for 3-min cooldown

    // ======================
    //        EVENTS
    // ======================
    event RaceStarted(uint256 raceId, uint256 commitEndTime, uint256 revealEndTime);
    event RaceCommitted(uint256 raceId, address indexed player, bytes32 commitHash, uint256 deposit);
    event RaceRevealed(uint256 raceId, address indexed player, uint256 seed);
    event RaceFinalized(uint256 raceId, address winner, uint256 winnerPrize, uint256 devFee);
    event ThresholdPayout(address dev, uint256 amount);

    constructor() {
        currentRaceId = 0;
        lastRaceFinishTime = block.timestamp;
    }

    // ======================
    //   PUBLIC FUNCTIONS
    // ======================

    /**
     * @dev Start a new race, can only be done if:
     *      - The previous race is finished
     *      - 3 minutes have passed since that race ended
     */
    function startRace() external whenNotPaused {
        // Require cooldown
        require(
            block.timestamp >= lastRaceFinishTime + COOLDOWN_DURATION,
            "Wait 3-min cooldown"
        );

        // Increment race ID
        currentRaceId++;
        Race storage r = races[currentRaceId];
        r.raceId = currentRaceId;
        r.status = RaceStatus.Commit;
        r.commitEndTime = block.timestamp + COMMIT_PHASE_DURATION;
        r.revealEndTime = r.commitEndTime + REVEAL_PHASE_DURATION;

        emit RaceStarted(currentRaceId, r.commitEndTime, r.revealEndTime);
    }

    /**
     * @dev Commit your random seed hash + deposit (must be whole number of ETH).
     *      The commit hash is typically keccak256(abi.encodePacked(seed, salt, msg.sender)).
     */
    function commitSeed(bytes32 _commitHash) external payable whenNotPaused nonReentrant {
        Race storage r = races[currentRaceId];
        require(r.status == RaceStatus.Commit, "Not in commit phase");
        require(block.timestamp < r.commitEndTime, "Commit phase over");

        // Must not already committed
        PlayerData storage pdata = r.playerInfo[msg.sender];
        require(pdata.commitHash == 0, "Already committed");

        // Check deposit is multiple of 1 ETH
        require(msg.value > 0 && (msg.value % 1 ether == 0), "Deposit must be whole Sonic");
        // Check players not exceeding max
        require(r.players.length < MAX_PLAYERS, "Max 100 players reached");

        // Store player info
        pdata.commitHash = _commitHash;
        pdata.deposit    = msg.value;
        r.players.push(msg.sender);

        emit RaceCommitted(currentRaceId, msg.sender, _commitHash, msg.value);

        // Check threshold
        _checkContractThreshold();
    }

    /**
     * @dev Reveal your seed in the reveal phase. The contract verifies your commit hash.
     *      If you never reveal, you cannot win (your deposit remains in the pot anyway).
     */
    function revealSeed(uint256 _seed) external whenNotPaused nonReentrant {
        Race storage r = races[currentRaceId];
        require(r.status == RaceStatus.Commit || r.status == RaceStatus.Reveal, "Wrong phase");
        require(block.timestamp >= r.commitEndTime, "Reveal not started");
        require(block.timestamp < r.revealEndTime, "Reveal phase ended");

        PlayerData storage pdata = r.playerInfo[msg.sender];
        require(pdata.commitHash != 0, "No commit found for you");
        require(!pdata.hasRevealed, "Already revealed");

        // Recompute commit
        // We encourage players to do: keccak256(abi.encodePacked(seed, salt, msg.sender)) 
        // so it's unique. But we only store the final hash, can't check the salt's presence.
        bytes32 checkHash = keccak256(abi.encodePacked(_seed, msg.sender));
        require(checkHash == pdata.commitHash, "Hash mismatch. Wrong seed or salt?");

        // Mark revealed
        pdata.hasRevealed = true;
        pdata.revealedSeed = _seed;

        // Race transitions to Reveal status if it was in Commit
        if (r.status == RaceStatus.Commit) {
            r.status = RaceStatus.Reveal;
        }

        emit RaceRevealed(currentRaceId, msg.sender, _seed);
    }

    /**
     * @dev Finalize the race after reveal phase ends, picking a winner from those who revealed.
     *      If fewer than 2 players ended up revealing, we refund all deposits.
     */
    function finalizeRace() external whenNotPaused nonReentrant {
        Race storage r = races[currentRaceId];
        require(!r.isPaidOut, "Already paid out");
        require(r.status == RaceStatus.Reveal, "Race not in reveal status");
        require(block.timestamp >= r.revealEndTime, "Reveal phase not ended");

        r.status = RaceStatus.Finished;
        lastRaceFinishTime = block.timestamp;

        // Gather all REVEALED players
        address[] memory revealedPlayers = _getRevealedPlayers(r);
        uint256 revealedCount = revealedPlayers.length;

        if (revealedCount < MIN_PLAYERS) {
            // Refund all players if not enough reveals
            _refundAll(r);
            return;
        }

        // 1) Calculate pot size = sum of *all* deposits (even from non-reveal players)
        uint256 pot = _sumAllDeposits(r);

        // 2) Aggregate seeds from revealed players
        bytes32 aggregator;
        for (uint256 i = 0; i < revealedPlayers.length; i++) {
            address p = revealedPlayers[i];
            aggregator = bytes32(uint256(aggregator) ^ r.playerInfo[p].revealedSeed);
        }

        // 3) Turn aggregator into finalRand (keccak + block data)
        uint256 finalRand = uint256(
            keccak256(
                abi.encodePacked(
                    aggregator,
                    block.timestamp,
                    block.prevrandao,
                    pot,
                    revealedCount
                )
            )
        );

        // 4) Pick winner index
        uint256 winnerIndex = finalRand % revealedCount;
        address winnerAddr = revealedPlayers[winnerIndex];
        r.winner = winnerAddr;

        // 5) Pay out: 90% to winner, 10% dev
        uint256 devFee = (pot * DEV_FEE_PERCENT) / 100;
        uint256 winnerPrize = pot - devFee;

        // Transfer
        (bool wsuccess, ) = winnerAddr.call{value: winnerPrize}("");
        require(wsuccess, "Winner transfer failed");

        (bool dsuccess, ) = owner().call{value: devFee}("");
        require(dsuccess, "Dev fee transfer failed");

        r.isPaidOut = true;

        emit RaceFinalized(currentRaceId, winnerAddr, winnerPrize, devFee);
    }

    // ======================
    //     INTERNAL LOGIC
    // ======================

    /**
     * @dev If the contract balance >= 60, auto-sends 50 to dev for security/honeypot minimization.
     */
    function _checkContractThreshold() internal {
        uint256 bal = address(this).balance;
        if (bal >= THRESHOLD_BALANCE) {
            (bool success, ) = owner().call{value: THRESHOLD_PAYOUT}("");
            require(success, "Threshold dev payout failed");
            emit ThresholdPayout(owner(), THRESHOLD_PAYOUT);
        }
    }

    /**
     * @dev Refunds all deposits (both revealed and non-revealed) if the race is invalid (not enough reveals).
     */
    function _refundAll(Race storage r) internal {
        // Anyone who committed deposit gets it back
        uint256 len = r.players.length;
        for (uint256 i = 0; i < len; i++) {
            address player = r.players[i];
            uint256 depositAmt = r.playerInfo[player].deposit;
            if (depositAmt > 0) {
                r.playerInfo[player].deposit = 0; // zero it out to avoid re-entrancy
                (bool success, ) = player.call{value: depositAmt}("");
                require(success, "Refund failed");
            }
        }
        r.isPaidOut = true;
    }

    /**
     * @dev Returns an array of all players who revealed.
     */
    function _getRevealedPlayers(Race storage r) internal view returns (address[] memory) {
        address[] memory pl = r.players;
        // Count how many revealed
        uint256 count;
        for (uint256 i = 0; i < pl.length; i++) {
            if (r.playerInfo[pl[i]].hasRevealed) {
                count++;
            }
        }

        // Build a smaller array
        address[] memory revealed = new address[](count);
        uint256 idx;
        for (uint256 i = 0; i < pl.length; i++) {
            if (r.playerInfo[pl[i]].hasRevealed) {
                revealed[idx] = pl[i];
                idx++;
            }
        }
        return revealed;
    }

    /**
     * @dev Sums deposit from all players (revealed or not).
     */
    function _sumAllDeposits(Race storage r) internal view returns (uint256) {
        uint256 total;
        address[] memory pl = r.players;
        for (uint256 i = 0; i < pl.length; i++) {
            total += r.playerInfo[pl[i]].deposit;
        }
        return total;
    }

    // ======================
    //        GETTERS
    // ======================
    function getPlayers(uint256 _raceId) external view returns (address[] memory) {
        return races[_raceId].players;
    }

    function getRaceStatus(uint256 _raceId) external view returns (RaceStatus) {
        return races[_raceId].status;
    }

    function getCurrentRaceTimes() external view returns (
        uint256 commitEnd,
        uint256 revealEnd
    ) {
        Race storage r = races[currentRaceId];
        commitEnd = r.commitEndTime;
        revealEnd = r.revealEndTime;
    }

    // ======================
    //   OWNER / ADMIN
    // ======================

    /**
     * @dev Pause the contract (stop commits, reveals, new race starts).
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @dev Unpause the contract
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @dev Emergency withdraw (owner can take entire balance).
     *      This overrides normal game flow, used only if something goes really wrong.
     */
    function emergencyWithdrawAll() external onlyOwner {
        uint256 bal = address(this).balance;
        (bool success, ) = owner().call{value: bal}("");
        require(success, "Emergency withdraw failed");
    }

    // Accept direct ETH (Sonic) deposits
    receive() external payable {
        // If random ETH is sent, add it to the contract. Then check threshold.
        _checkContractThreshold();
    }
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

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

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