Contract Address Details

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

interface IRaceStaking {
    function stakes(uint256 tokenId) external view returns (address owner, uint48 stakedAt, uint48 effectiveLock);
}

/// @title SpunkRace V2 — Round-based 30-day journey to the egg
/// @notice All entrants run the gauntlet simultaneously. Survivors split the pot.
/// Entry: 200K SPUNK → 100K pot, 80K burned, 20K dev
/// Higher rank NFTs have better survival odds.
contract SpunkRace is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    IERC20 public immutable spunkCoin;
    address public immutable stakingContract;

    // ── Config ──
    uint256 public entryFee = 200_000 ether;     // 200K SPUNK
    uint256 public potBps = 5000;                 // 50% to pot
    uint256 public burnBps = 4000;                // 40% burned
    uint256 public devBps = 1000;                 // 10% to dev
    address public devWallet;
    uint256 public roundDuration = 24 hours;
    uint256 public maxEntries = 50;
    uint256 public revealDelay = 5;               // blocks after round ends
    uint256 public obstacleChance = 4000;         // 40% per day (out of 10000)
    uint256 public autoSeedAmount = 0;             // Auto-add to next pot on resolve (beta testing)

    // ── Obstacle kill chances (out of 10000) ──
    // 0: White Blood Cell 20%, 1: Antibody 25%, 2: pH Barrier 15%,
    // 3: Cervical Mucus 10%, 4: Macrophage 30%, 5: Immune Response 22%,
    // 6: Temperature Shock 12%, 7: Toxic Environment 18%

    // ── Rank survival bonus (basis points reduction to kill chance) ──
    // Mythic (1-10): 30% less likely to die
    // Legendary (11-100): 20% less likely
    // Rare (101-500): 15% less likely
    // Uncommon (501-2000): 10% less likely
    // Common (2001+): no bonus

    struct Entry {
        address player;
        uint256 tokenId;
        uint256 rank;
        bool survived;
        uint8 diedOnDay;      // 0 = survived all 30 days
    }

    struct Round {
        uint256 startTime;
        uint256 endTime;
        uint256 potAmount;
        uint256 totalEntries;
        uint256 resolveBlock;
        uint256 survivorCount;
        uint256 rolloverFromPrev;   // Pot from previous round if nobody survived
        bool resolved;
        bool active;
    }

    mapping(uint256 => Round) public rounds;
    mapping(uint256 => Entry[]) public roundEntries;
    mapping(uint256 => mapping(address => bool)) public hasEntered;

    uint256 public currentRoundId;
    uint256 public totalRounds;
    uint256 public totalBurned;
    uint256 public rolloverPot;       // Accumulated from rounds with no survivors

    // ── Events ──
    event RoundStarted(uint256 indexed roundId, uint256 endTime, uint256 rollover);
    event Entered(uint256 indexed roundId, address indexed player, uint256 tokenId, uint256 rank);
    event RoundResolved(uint256 indexed roundId, uint256 survivors, uint256 totalPot, uint256 burned);
    event Survived(uint256 indexed roundId, address indexed player, uint256 tokenId, uint256 prize);
    event Died(uint256 indexed roundId, address indexed player, uint256 tokenId, uint8 day, uint8 obstacle);
    event NoSurvivors(uint256 indexed roundId, uint256 potRolledOver);

    constructor(address _spunkCoin, address _stakingContract, address _devWallet) Ownable(msg.sender) {
        spunkCoin = IERC20(_spunkCoin);
        stakingContract = _stakingContract;
        devWallet = _devWallet;
    }

    // ══════════════════════════════════════
    //  ROUNDS
    // ══════════════════════════════════════

    function startRound() external onlyOwner {
        if (currentRoundId > 0 && rounds[currentRoundId].active) revert("Round active");

        currentRoundId = ++totalRounds;
        Round storage r = rounds[currentRoundId];
        r.startTime = block.timestamp;
        r.endTime = block.timestamp + roundDuration;
        r.active = true;
        r.rolloverFromPrev = rolloverPot;
        r.potAmount = rolloverPot;
        rolloverPot = 0;

        emit RoundStarted(currentRoundId, r.endTime, r.rolloverFromPrev);
    }

    function enter(uint256 tokenId, uint256 rank) external nonReentrant {
        Round storage r = rounds[currentRoundId];
        require(r.active, "No active round");
        require(block.timestamp < r.endTime, "Round ended");
        require(r.totalEntries < maxEntries, "Round full");
        require(!hasEntered[currentRoundId][msg.sender], "Already entered");
        require(rank >= 1 && rank <= 10000, "Invalid rank");

        // Verify token is staked by this user
        (address stakeOwner,,) = IRaceStaking(stakingContract).stakes(tokenId);
        require(stakeOwner == msg.sender, "Not your staked token");

        // Take entry fee
        spunkCoin.safeTransferFrom(msg.sender, address(this), entryFee);

        // Split: pot / burn / dev
        uint256 toPot = (entryFee * potBps) / 10000;
        uint256 toBurn = (entryFee * burnBps) / 10000;
        uint256 toDev = entryFee - toPot - toBurn;

        // Burn
        spunkCoin.safeTransfer(address(0xdead), toBurn);
        totalBurned += toBurn;

        // Dev
        spunkCoin.safeTransfer(devWallet, toDev);

        // Add to pot
        r.potAmount += toPot;

        // Add entry
        roundEntries[currentRoundId].push(Entry({
            player: msg.sender,
            tokenId: tokenId,
            rank: rank,
            survived: false,
            diedOnDay: 0
        }));

        r.totalEntries++;
        hasEntered[currentRoundId][msg.sender] = true;

        emit Entered(currentRoundId, msg.sender, tokenId, rank);
    }

    function resolveRound(uint256 roundId) external nonReentrant {
        Round storage r = rounds[roundId];
        require(r.active, "Not active");
        require(block.timestamp >= r.endTime, "Round not ended");
        require(!r.resolved, "Already resolved");
        require(r.totalEntries > 0, "No entries");

        // Set resolve block
        if (r.resolveBlock == 0) {
            r.resolveBlock = block.number + revealDelay;
            return;
        }

        require(block.number > r.resolveBlock, "Wait for reveal block");
        require(block.number <= r.resolveBlock + 256, "Expired, restart");

        uint256 seed = uint256(blockhash(r.resolveBlock));
        require(seed != 0, "Blockhash unavailable");

        // Simulate the 30-day journey for each entry
        Entry[] storage entries = roundEntries[roundId];
        uint256 survivors = 0;
        uint256 totalSurvivorWeight = 0;

        for (uint256 i = 0; i < entries.length; i++) {
            (bool survived, uint8 diedOnDay, uint8 killedBy) = _simulateJourney(seed, i, entries[i].rank);
            entries[i].survived = survived;
            entries[i].diedOnDay = diedOnDay;

            if (survived) {
                survivors++;
                totalSurvivorWeight += _getWeight(entries[i].rank);
                emit Survived(roundId, entries[i].player, entries[i].tokenId, 0); // prize filled below
            } else {
                emit Died(roundId, entries[i].player, entries[i].tokenId, diedOnDay, killedBy);
            }
        }

        r.survivorCount = survivors;
        r.resolved = true;
        r.active = false;

        if (survivors == 0) {
            // Nobody made it — pot rolls to next round
            rolloverPot += r.potAmount;
            emit NoSurvivors(roundId, r.potAmount);
            emit RoundResolved(roundId, 0, r.potAmount, 0);
            return;
        }

        // Distribute pot to survivors weighted by rank
        uint256 distributed = 0;
        for (uint256 i = 0; i < entries.length; i++) {
            if (!entries[i].survived) continue;

            uint256 weight = _getWeight(entries[i].rank);
            uint256 share = (r.potAmount * weight) / totalSurvivorWeight;

            // Last survivor gets remainder (avoid dust)
            if (distributed + share > r.potAmount) {
                share = r.potAmount - distributed;
            }

            spunkCoin.safeTransfer(entries[i].player, share);
            distributed += share;
        }

        emit RoundResolved(roundId, survivors, r.potAmount, totalBurned);

        // Auto-seed next pot (for beta testing)
        if (autoSeedAmount > 0) {
            rolloverPot += autoSeedAmount;
        }
    }

    /// @notice Anyone can donate to the current round pot
    function seedJackpot(uint256 amount) external {
        require(amount > 0, "Zero");
        spunkCoin.safeTransferFrom(msg.sender, address(this), amount);
        if (currentRoundId > 0 && rounds[currentRoundId].active) {
            rounds[currentRoundId].potAmount += amount;
        } else {
            rolloverPot += amount;
        }
    }

    // ══════════════════════════════════════
    //  JOURNEY SIMULATION
    // ══════════════════════════════════════

    function _simulateJourney(uint256 seed, uint256 entryIndex, uint256 rank) internal view returns (bool survived, uint8 diedOnDay, uint8 killedBy) {
        survived = true;
        uint256 survivalBonus = _getSurvivalBonus(rank);

        for (uint256 day = 1; day <= 30; day++) {
            uint256 salt = entryIndex * 10000 + day * 100;

            // 40% chance of obstacle each day
            if (_roll(seed, salt) < obstacleChance) {
                uint8 obstType = uint8(_roll(seed, salt + 1) % 8);
                uint256 killChance = _getKillChance(obstType);

                // Apply rank survival bonus (reduces kill chance)
                killChance = (killChance * (10000 - survivalBonus)) / 10000;

                if (_roll(seed, salt + 2) < killChance) {
                    return (false, uint8(day), obstType);
                }
            }
        }
        return (true, 0, 0);
    }

    function _getKillChance(uint8 obstType) internal pure returns (uint256) {
        if (obstType == 0) return 2000; // WHITE BLOOD CELL 20%
        if (obstType == 1) return 2500; // ANTIBODY ATTACK 25%
        if (obstType == 2) return 1500; // PH BARRIER 15%
        if (obstType == 3) return 1000; // CERVICAL MUCUS 10%
        if (obstType == 4) return 3000; // MACROPHAGE 30%
        if (obstType == 5) return 2200; // IMMUNE RESPONSE 22%
        if (obstType == 6) return 1200; // TEMPERATURE SHOCK 12%
        return 1800;                    // TOXIC ENVIRONMENT 18%
    }

    function _getSurvivalBonus(uint256 rank) internal pure returns (uint256) {
        if (rank <= 10) return 3000;    // Mythic: 30% reduction
        if (rank <= 100) return 2000;   // Legendary: 20%
        if (rank <= 500) return 1500;   // Rare: 15%
        if (rank <= 2000) return 1000;  // Uncommon: 10%
        return 0;                       // Common: no bonus
    }

    function _getWeight(uint256 rank) internal pure returns (uint256) {
        if (rank <= 10) return 500;     // Mythic: 5x share
        if (rank <= 100) return 300;    // Legendary: 3x
        if (rank <= 500) return 200;    // Rare: 2x
        if (rank <= 2000) return 150;   // Uncommon: 1.5x
        return 100;                     // Common: 1x
    }

    function _roll(uint256 seed, uint256 salt) internal pure returns (uint256) {
        return uint256(keccak256(abi.encodePacked(seed, salt))) % 10000;
    }

    // ══════════════════════════════════════
    //  VIEWS
    // ══════════════════════════════════════

    function getRoundEntries(uint256 roundId) external view returns (Entry[] memory) {
        return roundEntries[roundId];
    }

    function getCurrentRound() external view returns (Round memory) {
        return rounds[currentRoundId];
    }

    /// @notice Preview what would happen with a given seed (for frontend animation)
    function previewJourney(uint256 seed, uint256 entryIndex, uint256 rank) external view returns (bool survived, uint8 diedOnDay, uint8 killedBy) {
        return _simulateJourney(seed, entryIndex, rank);
    }

    // ══════════════════════════════════════
    //  ADMIN
    // ══════════════════════════════════════

    function setEntryFee(uint256 _fee) external onlyOwner {
        entryFee = _fee;
    }

    function setRoundDuration(uint256 _duration) external onlyOwner {
        require(_duration >= 1 hours && _duration <= 7 days, "1h-7d");
        roundDuration = _duration;
    }

    function setMaxEntries(uint256 _max) external onlyOwner {
        require(_max >= 2 && _max <= 200, "2-200");
        maxEntries = _max;
    }

    function setDevWallet(address _dev) external onlyOwner {
        require(_dev != address(0), "Zero addr");
        devWallet = _dev;
    }

    function setAutoSeed(uint256 _amount) external onlyOwner {
        autoSeedAmount = _amount;
    }

    function setObstacleChance(uint256 _chance) external onlyOwner {
        require(_chance >= 1000 && _chance <= 8000, "10-80%");
        obstacleChance = _chance;
    }

    /// @notice Emergency: cancel round, refund pot to players
    function cancelRound(uint256 roundId) external onlyOwner nonReentrant {
        Round storage r = rounds[roundId];
        require(r.active, "Not active");
        require(!r.resolved, "Resolved");

        // Refund pot portion of entry fee to each player
        uint256 refundPer = (entryFee * potBps) / 10000;
        Entry[] storage entries = roundEntries[roundId];
        for (uint256 i = 0; i < entries.length; i++) {
            spunkCoin.safeTransfer(entries[i].player, refundPer);
        }

        r.active = false;
        r.potAmount = 0;
    }
}
        

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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 v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}