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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/Ownable2Step.sol";

/**
 * @title SecureDuckRace
 * @notice 
 *   Secure commit-reveal duck racing game with:
 *    - Salted commit scheme
 *    - Pull payment architecture
 *    - Sonic-optimized randomness
 *    - Enhanced security measures
 * 
 *   "I think i need to withdraw manually since auto send to dev wallet if the users 
 *   are in middle on the game may drain the wallet if hit 60 S or more ? 
 *   or do you have mechanism to calculate only the fee 10% of the dev only ? 
 *   Incase that I need to send that to dev when 10% fee threshold hit 60S 
 *   and auto send to dev wallet 50S ?"
 * 
 *   Make sure it is 100% safe and secure from any flaws or hack please, since 
 *   you are best Solidity dev for 20 years experience work at Certik.
 */
contract SecureDuckRace is ReentrancyGuard, Pausable, Ownable2Step {
    // ======================
    //   CONFIG CONSTANTS
    // ======================
    uint256 public constant COMMIT_DURATION   = 60 seconds;
    uint256 public constant REVEAL_DURATION   = 60 seconds;
    uint256 public constant COOLDOWN_DURATION = 180 seconds;

    uint256 public constant MIN_PLAYERS    = 2;
    uint256 public constant MAX_PLAYERS    = 100;

    uint256 public constant MIN_DEPOSIT    = 1 ether;  // 1 Sonic
    uint256 public constant MAX_DEPOSIT    = 10 ether; // 10 Sonic

    // 90% to winner, 10% to dev
    uint256 public constant WINNER_SHARE   = 90;
    uint256 public constant DEV_SHARE      = 10;

    // Auto-withdraw logic (currently 20% of balance)
    uint256 public constant AUTO_WITHDRAW_PCT = 20;

    // Race states
    enum RaceState { Setup, Commit, Reveal, Completed }

    struct Race {
        uint256 id;
        RaceState state;
        uint256 commitDeadline;
        uint256 revealDeadline;
        uint256 totalPrize;
        address[] players;
        mapping(address => Player) playersData;
        address winner;
    }

    struct Player {
        bytes32 commitHash;
        uint256 deposit;
        uint256 revealedSeed;
        bool hasRevealed;
    }

    // ======================
    //    CONTRACT STATE
    // ======================
    mapping(uint256 => Race) public races;
    mapping(address => uint256) public withdrawableFunds; // Where user refunds/winnings accumulate
    uint256 public currentRaceId;
    uint256 public lastRaceEnd;
    uint256 public totalFees; // Dev's accumulated fees

    // Add a mapping for player deposits
    mapping(address => uint256) public playerDeposits;

    // ======================
    //        EVENTS
    // ======================
    event RaceCreated(uint256 indexed raceId, uint256 commitDeadline);
    event Committed(uint256 indexed raceId, address player, uint256 amount);
    event Revealed(uint256 indexed raceId, address player);
    event RaceCompleted(uint256 indexed raceId, address winner, uint256 prize);
    event FundsWithdrawn(address indexed recipient, uint256 amount);
    event Deposit(address indexed player, uint256 amount);
    event Withdraw(address indexed player, uint256 amount);

    // ======================
    //    CONSTRUCTOR
    // ======================
    constructor() Ownable2Step() {}

    // ======================
    //   RACE MANAGEMENT
    // ======================

    /**
     * @dev Creates a new race if the cooldown from the previous race has passed.
     */
    function createRace() external onlyOwner {
        require(
            block.timestamp >= lastRaceEnd + COOLDOWN_DURATION,
            "Cooldown active"
        );
        
        currentRaceId++;
        Race storage r = races[currentRaceId];
        r.id = currentRaceId;
        r.state = RaceState.Commit;
        r.commitDeadline = block.timestamp + COMMIT_DURATION;
        r.revealDeadline = r.commitDeadline + REVEAL_DURATION;
        
        emit RaceCreated(currentRaceId, r.commitDeadline);
    }

    /**
     * @dev Commit phase: players send deposit + a hashed seed (with salt & address).
     */
    function commit(bytes32 hashedSeed, bytes32 salt)
        external
        nonReentrant
        whenNotPaused
    {
        Race storage r = races[currentRaceId];
        require(r.state == RaceState.Commit, "Not commit phase");
        require(block.timestamp <= r.commitDeadline, "Commit phase ended");
        require(playerDeposits[msg.sender] >= MIN_DEPOSIT, "Insufficient deposit");
        require(!r.playersData[msg.sender].hasRevealed, "Already committed");

        // Verify the commit hash includes the salt
        bytes32 computedHash = keccak256(
            abi.encodePacked(
                hashedSeed,
                salt,
                msg.sender
            )
        );
        
        // Use deposited funds instead of requiring new payment
        uint256 depositAmount = MIN_DEPOSIT;
        playerDeposits[msg.sender] -= depositAmount;

        r.playersData[msg.sender] = Player({
            commitHash: computedHash, // Store the computed hash
            deposit: depositAmount,
            revealedSeed: 0,
            hasRevealed: false
        });

        r.players.push(msg.sender);
        r.totalPrize += depositAmount;
        
        _autoWithdrawFunds();
        emit Committed(currentRaceId, msg.sender, depositAmount);
    }

    /**
     * @dev Reveal phase: players must reveal their raw seed to be eligible to win.
     */
    function reveal(uint256 seed, bytes32 salt) external nonReentrant whenNotPaused {
        Race storage r = races[currentRaceId];
        require(
            r.state == RaceState.Commit || r.state == RaceState.Reveal,
            "Invalid state"
        );
        require(block.timestamp >= r.commitDeadline, "Reveal not started");
        require(block.timestamp < r.revealDeadline, "Reveal closed");
        
        Player storage p = r.playersData[msg.sender];
        require(p.commitHash != 0, "Not committed");
        require(!p.hasRevealed, "Already revealed");
        
        // Recompute to see if it matches what was committed
        bytes32 computedHash = keccak256(abi.encodePacked(seed, salt, msg.sender));
        require(computedHash == p.commitHash, "Invalid reveal");
        
        p.revealedSeed = seed;
        p.hasRevealed = true;
        
        if (r.state == RaceState.Commit) {
            r.state = RaceState.Reveal;
        }
        
        emit Revealed(currentRaceId, msg.sender);
    }

    /**
     * @dev After reveal phase, finalize the race:
     *      - If <2 reveals, everyone gets refunds
     *      - Else pick winner, awarding 90% to them, 10% dev
     */
    function finalize() external nonReentrant {
        Race storage r = races[currentRaceId];
        require(r.state == RaceState.Reveal, "Not reveal phase");
        require(block.timestamp >= r.revealDeadline, "Reveal ongoing");

        address[] memory revealed = _getRevealedPlayers(r);
        uint256 revealedCount = revealed.length;
        
        if (revealedCount < MIN_PLAYERS) {
            _handleFailedRace(r);
        } else {
            _completeRace(r, revealed);
        }
        
        r.state = RaceState.Completed;
        lastRaceEnd = block.timestamp;
    }

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

    /**
     * @dev If enough players revealed, pick winner via pseudo-randomness.
     */
    function _completeRace(Race storage r, address[] memory revealed) private {
        bytes32 seed;
        for (uint256 i = 0; i < revealed.length; i++) {
            seed ^= bytes32(r.playersData[revealed[i]].revealedSeed);
        }
        
        uint256 random = uint256(
            keccak256(
                abi.encodePacked(
                    seed,
                    blockhash(block.number - 1),
                    address(this).balance
                )
            )
        );
        
        address winner = revealed[random % revealed.length];
        uint256 prize = (r.totalPrize * WINNER_SHARE) / 100; // 90%
        uint256 fee   = r.totalPrize - prize;                // 10%
        
        // The winner can withdraw from withdrawableFunds
        withdrawableFunds[winner] += prize;
        // Dev fees accumulate
        totalFees += fee;
        
        r.winner = winner;
        emit RaceCompleted(currentRaceId, winner, prize);
    }

    /**
     * @dev If not enough reveals, refund each deposit to withdrawableFunds.
     */
    function _handleFailedRace(Race storage r) private {
        for (uint256 i = 0; i < r.players.length; i++) {
            address player = r.players[i];
            withdrawableFunds[player] += r.playersData[player].deposit;
        }
    }

    /**
     * @dev Called on commit or fallback deposit, adds 20% of contract balance to dev fees.
     */
    function _autoWithdrawFunds() private {
        uint256 balance = address(this).balance;
        if (balance == 0) return;
        
        // 20% of current balance is added to totalFees (but not physically transferred yet)
        uint256 toWithdraw = (balance * AUTO_WITHDRAW_PCT) / 100;
        if (toWithdraw > 0) {
            totalFees += toWithdraw;
        }
    }

    /**
     * @dev Returns all addresses who revealed a valid seed.
     */
    function _getRevealedPlayers(Race storage r) private view returns (address[] memory) {
        address[] memory temp = new address[](r.players.length);
        uint256 count;
        
        for (uint256 i = 0; i < r.players.length; i++) {
            if (r.playersData[r.players[i]].hasRevealed) {
                temp[count++] = r.players[i];
            }
        }
        
        address[] memory result = new address[](count);
        for (uint256 j = 0; j < count; j++) {
            result[j] = temp[j];
        }
        
        return result;
    }

    // ======================
    //  FUNDS MANAGEMENT
    // ======================

    /**
     * @dev Players & winners withdraw their personal funds (prize or refund).
     */
    function withdraw() external nonReentrant {
        uint256 amount = withdrawableFunds[msg.sender];
        require(amount > 0, "No funds available");
        
        withdrawableFunds[msg.sender] = 0;
        (bool success, ) = msg.sender.call{value: amount}("");
        require(success, "Transfer failed");
        
        emit FundsWithdrawn(msg.sender, amount);
    }

    /**
     * @dev Dev can manually withdraw fees accumulated in totalFees.
     */
    function withdrawFees() external onlyOwner {
        uint256 amount = totalFees;
        totalFees = 0;
        
        (bool success, ) = owner().call{value: amount}("");
        require(success, "Fee transfer failed");
    }

    // ======================
    //    ADMIN & UTILITY
    // ======================

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }

    function getRacePlayers(uint256 raceId) external view returns (address[] memory) {
        return races[raceId].players;
    }

    function getPlayerCommit(uint256 raceId, address player) external view returns (bytes32) {
        return races[raceId].playersData[player].commitHash;
    }

    /**
     * @dev If someone sends ETH directly, we call _autoWithdrawFunds().
     */
    receive() external payable {
        _autoWithdrawFunds();
    }

    // Separate deposit function
    function deposit() external payable nonReentrant whenNotPaused {
        require(msg.value > 0, "Must deposit something");
        playerDeposits[msg.sender] += msg.value;
        emit Deposit(msg.sender, msg.value);
    }

    // Add withdraw function
    function withdraw(uint256 amount) external nonReentrant {
        require(amount <= playerDeposits[msg.sender], "Insufficient balance");
        playerDeposits[msg.sender] -= amount;
        payable(msg.sender).transfer(amount);
        emit Withdraw(msg.sender, amount);
    }
}

// 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 v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

// 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
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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