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// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;

// OpenZeppelin Upgradeable Contracts
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

// Chainlink VRF Contracts
import "chainlink/contracts/src/v0.8/vrf/dev/VRFV2PlusWrapperConsumerBase.sol";
import "chainlink/contracts/src/v0.8/vrf/dev/libraries/VRFV2PlusClient.sol";

/**
 * @title VerticalAIRaffle
 * @notice A raffle system for VerticalAI with upgradeability, Chainlink VRF randomness, and time-based ticket multipliers.
 * @dev This contract uses the Transparent Proxy Pattern (no constructor, uses `initialize`).
 *      It allows an admin/owner to start raffles, configure parameters, and distribute prizes.
 *      Users can buy tickets, which receive a weight multiplier depending on the week.
 *      Random winners are selected using Chainlink VRF, and users can unstake their tokens at any time.
 *      If a user does not unstake their tokens before the next raffle starts, their staked tokens carry over into the new raffle phase,
 *      receiving the highest multiplier again.
 */
contract VerticalAIRaffle is
    Initializable,
    OwnableUpgradeable,
    ReentrancyGuardUpgradeable,
    VRFV2PlusWrapperConsumerBase(0x02aae1A04f9828517b3007f83f6181900CaD910c)
{
    using SafeERC20 for IERC20;

    /// @notice Emitted when a randomness request is sent.
    event RequestSent(uint256 indexed requestId, uint32 numWords);

    /// @notice Emitted when a randomness request is fulfilled.
    event RequestFulfilled(
        uint256 indexed requestId,
        uint256[] randomWords,
        uint256 payment
    );

    /// @notice Emitted when a new raffle starts.
    event RaffleStarted(
        uint256 ticketPrice,
        uint256 prizePool,
        uint256[] prizeDistribution,
        uint256 raffleEndTime
    );

    /// @notice Emitted when a user buys tickets.
    event TicketsBought(address indexed buyer, uint256 amount);

    /// @notice Emitted when a user claims their prize.
    event PrizeClaimed(address indexed winner, uint256 amount);

    /// @notice Emitted when a user unstakes their tickets.
    event TicketsUnstaked(
        address indexed user,
        uint256 amount,
        uint256 refundAmount
    );

    /**
     * @notice Emitted when raffle configuration is updated.
     */
    event RaffleConfigurationUpdated(
        uint256 prizePool,
        uint256[] prizeDistribution
    );

    /// @notice Emitted when the admin withdraws unclaimed funds.
    event UnclaimedFundsWithdrawn(address indexed admin, uint256 amount);

    /// @notice Emitted when the admin performs an emergency token withdrawal.
    event EmergencyWithdraw(
        address indexed owner,
        address indexed tokenAddress,
        uint256 amount
    );

    /// @notice Emitted when the admin performs an emergency ETH withdrawal.
    event EmergencyWithdrawETH(address indexed owner, uint256 amount);

    /// @notice Emitted when the staking token is changed.
    event StakingTokenChanged(address indexed newStakingToken);

    /// @notice Emitted when the VRF settings are changed.
    event VRFSettingsChanged(
        uint256 callbackGasLimit,
        uint16 requestConfirmations
    );

    // -------------------------------------------------------
    // Storage Layout
    // IMPORTANT: Do not modify existing variables' order or types.
    // For upgrades, append new variables at the end only.
    // -------------------------------------------------------

    /// @notice The ERC20 token used for buying (staking) tickets. Users stake these tokens when buying tickets.
    IERC20 public stakingToken;

    /// @notice The USDC ERC20 token used for prize distribution.
    IERC20 public usdcToken;

    /// @notice The timestamp at which the current raffle starts.
    uint256 public raffleStartTime;

    /// @notice The timestamp at which the current raffle ends.
    uint256 public raffleEndTime;

    /// @notice The timestamp after which ticket purchases (staking) are disabled. Typically 72 hours before raffle end.
    uint256 public stakingDisabledTime;

    /// @notice The price per ticket, denominated in `stakingToken` units.
    uint256 public ticketPrice;

    /// @notice Total number of raw tickets sold in the current raffle.
    uint256 public totalTickets;

    /// @notice Total prize pool in USDC for the current raffle phase.
    uint256 public prizePool;

    /// @notice The distribution percentages of the prize pool. For example: [50, 25, 10, 10, 5].
    uint256[] public prizeDistribution;

    /// @notice Indicates if prizes have already been distributed for the ended raffle.
    bool public prizesDistributed;

    /**
     * @dev Struct to represent the stakes of a user.
     * @param tokens The amount of tokens staked by the user.
     * @param timeStaked The timestamp when the tokens were staked.
     */
    struct Stakes {
        uint256 tokens;
        uint256 timeStaked;
    }

    /// @dev Data structure to hold a user's ticket information.
    struct User {
        Stakes[] stakes; // Array of stakes made by the user
        uint256 tickets; // Number of tickets incl. multipliers
        uint256 bonus; // Bonus tickets for the user
        bool hasClaimed; // True if the user has claimed their prize
    }

    /// @dev Data structure to hold the status of a VRF request.
    struct RequestStatus {
        uint256 paid; // amount paid in link
        bool fulfilled; // whether the request has been successfully fulfilled
        uint256[] randomWords;
    }

    /// @notice Mapping of users to their raffle data.
    mapping(address => User) public users;

    /// @notice List of all participants in the current raffle.
    address[] public participants;

    /// @notice Array of winner addresses selected after raffle ends.
    address[] public winners;

    /// @notice Mapping of winners to their assigned prize amount in USDC.
    mapping(address => uint256) public winnerPrize;

    /// @notice Mapping of VRF request IDs to their status.
    mapping(uint256 => RequestStatus) public s_requests;

    // Track selected winners to ensure uniqueness
    mapping(address => bool) public selectedWinners;

    /// @notice Timestamp marking when the last raffle ended. Used for unclaimed prize withdrawal logic.
    uint256 public lastRaffleEndTimestamp;

    /// @notice Array of past VRF request IDs.
    uint256[] public requestIds;

    /// @notice The last VRF request ID.
    uint256 public lastRequestId;

    /// @notice Indicates if randomness has been requested for the current raffle.
    bool public randomRequested;

    /// @notice Indicates if the requested randomness has been fulfilled by the VRF Coordinator.
    bool public randomFulfilled;

    /// @notice Gas limit for the callback function.
    uint32 public callbackGasLimit;

    /// @notice Number of confirmations the VRF request should wait before fulfillment.
    uint16 public requestConfirmations;

    /// @notice Number of random words to request from the VRF.
    uint32 public numWords;

    // Constants

    /// @notice The fixed duration of a raffle: 3 weeks.
    uint256 public constant RAFFLE_DURATION = 21 days;

    /// @notice The time before raffle end when staking (ticket purchases) is disabled: 72 hours.
    uint256 public constant DISABLE_STAKING_BEFORE_END = 72 hours;

    /// @notice The delay after which unclaimed prize funds can be withdrawn by the admin: 7 days.
    uint256 public constant UNCLAIMED_WITHDRAW_DELAY = 7 days;

    /// @notice The multiplier applied to ticket weight in the first week of the raffle.
    uint32 public constant MULTIPLIER_ON_FRESH_RAFFLE = 3;

    // -------------------------------------------------------
    // Initialization (instead of constructor)
    // -------------------------------------------------------

    /**
     * @notice Initializes the raffle contract. This replaces the constructor for upgradeability.
     * @dev Can only be called once.
     * @param _owner The address of the contract owner.
     * @param _stakingToken The ERC20 token used for staking (buying tickets).
     * @param _usdcToken The ERC20 token (USDC) used for prize distribution.
     */
    function initialize(
        address _owner,
        address _stakingToken,
        address _usdcToken
    ) external initializer {
        // Check if the owner address is valid
        require(_owner != address(0), "VerticalAIRaffle: Invalid owner");
        // Check if the staking token address is valid
        require(
            _stakingToken != address(0),
            "VerticalAIRaffle: Invalid staking token"
        );
        // Check if the USDC token address is valid
        require(
            _usdcToken != address(0),
            "VerticalAIRaffle: Invalid USDC token"
        );

        // Initialize the Ownable module with the owner address
        __Ownable_init(_owner);

        // Initialize the ReentrancyGuard module
        __ReentrancyGuard_init();

        // Set the staking token address
        stakingToken = IERC20(_stakingToken);

        // Set the USDC token address
        usdcToken = IERC20(_usdcToken);

        // Initialize VRFV2PlusWrapperConsumerBase with the wrapper address
        callbackGasLimit = 800_000;
        requestConfirmations = 3;
    }

    // -------------------------------------------------------
    // Raffle Management (Admin)
    // -------------------------------------------------------

    /**
     * @notice Starts a new raffle phase. Only callable by the owner.
     * @dev
     * - Resets and prepares the state for the new raffle.
     * - If users did not unstake their tokens after the last raffle, their staked tickets are carried over into this new raffle at the highest multiplier (3x).
     * @param _ticketPrice The new ticket price.
     * @param _prizePool The new prize pool in USDC.
     * @param _prizeDistribution The prize distribution percentages for the new raffle.
     */
    function startNewRaffle(
        uint256 _ticketPrice,
        uint256 _prizePool,
        uint256[] memory _prizeDistribution
    ) external onlyOwner {
        require(!raffleActive(), "VerticalAIRaffle: Previous raffle not ended");

        // Check if we are within the unclaimed withdraw delay
        require(
            block.timestamp > lastRaffleEndTimestamp + UNCLAIMED_WITHDRAW_DELAY,
            "VerticalAIRaffle: Unclaimed funds still locked"
        );

        require(
            _ticketPrice >= 1 ether,
            "VerticalAIRaffle: Invalid ticket price - must be at least 1 VertAI token"
        );
        require(
            _prizePool >= 1_000_000,
            "VerticalAIRaffle: Prize pool must be at least 1 USDC"
        );

        require(
            _prizeDistribution.length > 0,
            "VerticalAIRaffle: Invalid prize distribution"
        );

        require(
            _sumPrizeDistribution(_prizeDistribution) == 100,
            "VerticalAIRaffle: Prize distribution must be exactly 100%"
        );

        _resetRaffleState();

        ticketPrice = _ticketPrice;
        prizePool = _prizePool;
        prizeDistribution = _prizeDistribution;
        raffleStartTime = block.timestamp;
        raffleEndTime = block.timestamp + RAFFLE_DURATION;
        stakingDisabledTime = raffleEndTime - DISABLE_STAKING_BEFORE_END;
        prizesDistributed = false;
        randomRequested = false;
        randomFulfilled = false;

        emit RaffleStarted(
            _ticketPrice,
            _prizePool,
            _prizeDistribution,
            raffleEndTime
        );
    }

    /**
     * @dev Internal function to reset the state of the raffle before starting a new one.
     *      Users who did not unstake their tokens are carried over into the new raffle.
     *      Their bonus is recalculated using the highest multiplier (3x).
     */
    function _resetRaffleState() internal {
        address[] memory oldParticipants = participants;
        totalTickets = 0;

        // Clear previous winners from the mapping
        for (uint256 i = 0; i < winners.length; i++) {
            delete selectedWinners[winners[i]];
        }

        // Clear arrays
        delete participants;
        delete winners;

        for (uint256 i = 0; i < oldParticipants.length; i++) {
            address userAddr = oldParticipants[i];
            User storage u = users[userAddr];

            if (u.tickets > 0) {
                // User still has staked tickets, carry them over with highest multiplier
                u.bonus = (u.tickets * MULTIPLIER_ON_FRESH_RAFFLE) - u.tickets;
                // Reset hasClaimed for the new raffle
                u.hasClaimed = false;
                // Add user back as participant in new raffle
                participants.push(userAddr);
                totalTickets += (u.tickets + u.bonus);
            } else {
                // Explicitly reset each field instead of using delete
                u.tickets = 0;
                u.bonus = 0;
                u.hasClaimed = false;

                // Clear stakes array safely
                while (u.stakes.length > 0) {
                    u.stakes.pop();
                }
            }
        }
    }

    /**
     * @notice Sets the raffle configuration mid-round if needed. Only owner.
     * @dev Allows updating the prize pool and distribution if the raffle is active.
     * @param _prizePool The updated prize pool in USDC.
     * @param _prizeDistribution The updated prize distribution percentages.
     */
    function setRaffleConfiguration(
        uint256 _prizePool,
        uint256[] memory _prizeDistribution
    ) external onlyOwner {
        require(raffleActive(), "VerticalAIRaffle: No active raffle");
        require(
            _prizeDistribution.length > 0,
            "VerticalAIRaffle: Invalid prize distribution"
        );
        require(
            _sumPrizeDistribution(_prizeDistribution) == 100,
            "VerticalAIRaffle: Prize distribution must be exactly 100%"
        );

        prizePool = _prizePool;
        prizeDistribution = _prizeDistribution;

        emit RaffleConfigurationUpdated(_prizePool, _prizeDistribution);
    }

    // -------------------------------------------------------
    // Buying Tickets (User)
    // -------------------------------------------------------

    /**
     * @notice Allows users to buy tickets using the stakingToken. Must be approved beforehand.
     * @dev Transfers staking tokens from the user to the contract, calculates tickets and bonus based on current multiplier,
     *      updates user's stakes and total tickets accordingly.
     * @param amount The amount of staking tokens to spend for buying tickets.
     */
    function buyTickets(uint256 amount) external nonReentrant {
        require(raffleActive(), "VerticalAIRaffle: Staking not active");
        require(
            block.timestamp < stakingDisabledTime,
            "VerticalAIRaffle: Staking disabled"
        );
        require(amount > 0, "VerticalAIRaffle: Amount must be > 0");

        require(amount % ticketPrice == 0, "VerticalAIRaffle: Invalid amount");

        uint256 tickets = amount / ticketPrice;

        // Check if the user has enough allowance
        uint256 allowance = stakingToken.allowance(msg.sender, address(this));
        require(
            allowance >= amount,
            "VerticalAIRaffle: Insufficient allowance. Please approve the contract to spend your tokens."
        );

        stakingToken.safeTransferFrom(msg.sender, address(this), amount);

        uint256 multiplier = getMultiplier();
        User storage u = users[msg.sender];

        if (u.tickets == 0) {
            participants.push(msg.sender);
        }

        // Calculate new tickets and bonus for this purchase only
        uint256 newTickets = tickets;
        uint256 newBonus = tickets * (multiplier - 1);

        // Update user's total tickets and bonus
        u.tickets += newTickets;
        u.bonus += newBonus;

        // Add a new stake for the user
        u.stakes.push(Stakes({tokens: amount, timeStaked: block.timestamp}));

        // Update total tickets with only the new tickets and bonus
        totalTickets += (newTickets + newBonus);

        emit TicketsBought(msg.sender, tickets);
    }

    /**
     * @notice Returns the current week-based multiplier for ticket weight.
     * @dev Week 1: 3x, Week 2: 2x, Week 3: 1x. Returns 0 if raffle is not active.
     * @return The current multiplier for purchased tickets.
     */
    function getMultiplier() public view returns (uint256) {
        if (!raffleActive()) {
            return 0;
        }

        uint256 elapsed = block.timestamp > raffleEndTime
            ? RAFFLE_DURATION
            : block.timestamp - (raffleEndTime - RAFFLE_DURATION);

        if (elapsed < 7 days) {
            return 3; // Week 1
        } else if (elapsed < 14 days) {
            return 2; // Week 2
        } else {
            return 1; // Week 3
        }
    }

    // -------------------------------------------------------
    // Distributing Prizes (Admin)
    // -------------------------------------------------------

    /**
     * @notice Called by the owner after the raffle ends to request randomness for selecting winners.
     * @dev Uses Chainlink VRF to request random words. The number of words requested is based on the length of the prize distribution.
     * @param enableNativePayment Determines if the payment for VRF is made in native tokens.
     * @return requestId The ID of the randomness request.
     */
    function distributePrizes(
        bool enableNativePayment
    ) external payable onlyOwner nonReentrant returns (uint256 requestId) {
        require(!raffleActive(), "VerticalAIRaffle: Raffle still active");
        require(
            !prizesDistributed,
            "VerticalAIRaffle: Prizes already distributed"
        );
        require(
            !randomRequested,
            "VerticalAIRaffle: Randomness already requested"
        );

        // Dynamically set numWords based on prizeDistribution length
        numWords = uint32(prizeDistribution.length);

        bytes memory extraArgs = VRFV2PlusClient._argsToBytes(
            VRFV2PlusClient.ExtraArgsV1({nativePayment: enableNativePayment})
        );

        uint256 reqPrice;
        if (enableNativePayment) {
            (requestId, reqPrice) = requestRandomnessPayInNative(
                callbackGasLimit,
                requestConfirmations,
                numWords,
                extraArgs
            );
        } else {
            (requestId, reqPrice) = requestRandomness(
                callbackGasLimit,
                requestConfirmations,
                numWords,
                extraArgs
            );
        }

        s_requests[requestId] = RequestStatus({
            paid: reqPrice,
            randomWords: new uint256[](0),
            fulfilled: false
        });

        requestIds.push(requestId);
        lastRequestId = requestId;
        randomRequested = true;

        emit RequestSent(requestId, numWords);
    }

    /**
     * @notice VRF callback function to fulfill randomness.
     * @dev Called by the VRF Coordinator once random words are ready. Finalizes winner selection and prize allocation.
     *      Each winner is selected to be unique based on weighted random picks using a cumulative weights array and binary search.
     * @param _requestId The request ID of the VRF response.
     * @param _randomWords The array of random words provided by the VRF.
     */
    function fulfillRandomWords(
        uint256 _requestId,
        uint256[] memory _randomWords
    ) internal override {
        require(
            s_requests[_requestId].paid > 0,
            "VerticalAIRaffle: Request not found"
        );
        require(
            !s_requests[_requestId].fulfilled,
            "VerticalAIRaffle: Request already fulfilled"
        );
        s_requests[_requestId].fulfilled = true;

        randomFulfilled = true;

        emit RequestFulfilled(
            _requestId,
            _randomWords,
            s_requests[_requestId].paid
        );

        // If no participants exist, finalize without selecting winners.
        if (participants.length == 0) {
            prizesDistributed = true;
            lastRaffleEndTimestamp = block.timestamp;
            return;
        }

        // Build a cumulative weights array from participants based on their ticket weights.
        (
            uint256[] memory cumulativeWeights,
            uint256 totalWeight
        ) = _getCumulativeWeights();
        require(totalWeight > 0, "VerticalAIRaffle: Total weight is zero");

        // Select winners based on weighted random picks using binary search.
        for (uint256 i = 0; i < prizeDistribution.length; i++) {
            uint256 rand = _randomWords[i] % totalWeight;
            uint256 target = rand + 1;
            uint256 index = _binarySearch(cumulativeWeights, target);
            address winner = participants[index];

            // Ensure the winner is unique by using an offset
            uint256 offset = 0;
            while (selectedWinners[winner] && offset < participants.length) {
                offset++;
                uint256 newRand = (_randomWords[i] + offset) % totalWeight;
                target = newRand + 1;
                index = _binarySearch(cumulativeWeights, target);
                winner = participants[index];
            }

            selectedWinners[winner] = true;
            winners.push(winner);
        }

        // Allocate prizes based on distribution percentages.
        for (uint256 i = 0; i < winners.length; i++) {
            uint256 prizeAmount = (prizePool * prizeDistribution[i]) / 100;
            winnerPrize[winners[i]] += prizeAmount;
        }

        prizesDistributed = true;
        lastRaffleEndTimestamp = block.timestamp;
    }

    /**
     * @notice Builds a cumulative weights array from participants based on their ticket weights.
     * @dev The weight used is the sum of tickets and bonus.
     * @return cumulativeWeights The cumulative weights array.
     * @return totalWeight The total weight sum.
     */
    function _getCumulativeWeights()
        internal
        view
        returns (uint256[] memory cumulativeWeights, uint256 totalWeight)
    {
        cumulativeWeights = new uint256[](participants.length);
        uint256 sum = 0;
        for (uint256 i = 0; i < participants.length; i++) {
            uint256 weight = users[participants[i]].tickets +
                users[participants[i]].bonus;
            sum += weight;
            cumulativeWeights[i] = sum;
        }
        totalWeight = sum;
    }

    /**
     * @notice Performs a binary search on a sorted array to find the first index where the value is greater or equal to the target.
     * @param arr The sorted array of cumulative weights.
     * @param target The target value to search for.
     * @return The index in the array.
     */
    function _binarySearch(
        uint256[] memory arr,
        uint256 target
    ) internal pure returns (uint256) {
        uint256 low = 0;
        uint256 high = arr.length - 1;
        while (low < high) {
            uint256 mid = low + (high - low) / 2;
            if (arr[mid] < target) {
                low = mid + 1;
            } else {
                high = mid;
            }
        }
        return low;
    }

    // -------------------------------------------------------
    // Claiming Prizes (User)
    // -------------------------------------------------------

    /**
     * @notice Allows a winner to claim their allocated USDC prize after the raffle ends and prizes are distributed.
     * @dev Checks that prizes are distributed, the caller hasn't claimed before, and then transfers the prize.
     */
    function claimPrize() external nonReentrant {
        require(
            !raffleActive() && prizesDistributed,
            "VerticalAIRaffle: Prizes not distributed yet"
        );

        uint256 amount = winnerPrize[msg.sender];

        require(
            !users[msg.sender].hasClaimed,
            "VerticalAIRaffle: Already claimed"
        );
        require(amount > 0, "VerticalAIRaffle: No prize for you");

        // Add balance check for safety
        uint256 contractBalance = usdcToken.balanceOf(address(this));
        require(
            contractBalance >= amount,
            "VerticalAIRaffle: Insufficient USDC balance"
        );

        // Update state before transfer (checks-effects-interactions)
        users[msg.sender].hasClaimed = true;
        winnerPrize[msg.sender] = 0;

        // Transfer USDC directly to the winner
        usdcToken.safeTransfer(msg.sender, amount);

        emit PrizeClaimed(msg.sender, amount);
    }

    // -------------------------------------------------------
    // Unstaking Tickets (User)
    // -------------------------------------------------------

    /**
     * @notice Allows users to unstake all or a portion of their staked tokens.
     * @dev If no amount is provided (amount = 0), unstakes all tokens.
     * @param amount The amount of tokens to unstake, 0 for full unstake.
     */
    function unstakeTickets(uint256 amount) external nonReentrant {
        User storage u = users[msg.sender];
        require(u.tickets > 0, "VerticalAIRaffle: No tickets to unstake");
        require(amount % ticketPrice == 0, "VerticalAIRaffle: Invalid amount");

        // Calculate total staked tokens by summing all stakes.
        uint256 totalStaked = 0;
        for (uint256 i = 0; i < u.stakes.length; i++) {
            totalStaked += u.stakes[i].tokens;
        }

        // If amount is 0 or equals totalStaked, perform full unstake.
        if (amount == 0 || amount == totalStaked) {
            uint256 refundAmount = totalStaked;
            uint256 userTickets = u.tickets;
            uint256 userBonus = u.bonus;

            // Update global ticket count.
            totalTickets = totalTickets - userTickets - userBonus;

            // Reset user's ticket and bonus values.
            u.tickets = 0;
            u.bonus = 0;

            // Clear user's stakes array.
            while (u.stakes.length > 0) {
                u.stakes.pop();
            }

            // Remove user from participants list.
            _removeParticipant(msg.sender);

            // Transfer all tokens back to the user.
            stakingToken.safeTransfer(msg.sender, refundAmount);

            emit TicketsUnstaked(msg.sender, userTickets, refundAmount);
            return;
        }

        // Partial unstake logic.
        require(
            amount <= totalStaked,
            "VerticalAIRaffle: Amount exceeds staked tokens"
        );
        require(amount > 0, "VerticalAIRaffle: Invalid amount");

        // Use a scaling factor (1e18) to avoid integer truncation.
        uint256 scale = 1e18;
        uint256 unstakePercentage = (amount * scale) / totalStaked;

        // Calculate tickets and bonus to remove with fixed-point math.
        uint256 ticketsToRemove = (u.tickets * unstakePercentage) / scale;
        uint256 bonusToRemove = (u.bonus * unstakePercentage) / scale;

        // Update global ticket count.
        totalTickets = totalTickets - ticketsToRemove - bonusToRemove;

        // Update user's tickets and bonus.
        u.tickets = u.tickets - ticketsToRemove;
        u.bonus = u.bonus - bonusToRemove;

        // Create a new stakes array with reduced amounts.
        Stakes[] memory newStakes = new Stakes[](u.stakes.length);
        uint256 newStakesCount = 0;

        for (uint256 i = 0; i < u.stakes.length; i++) {
            uint256 reducedAmount = u.stakes[i].tokens -
                ((u.stakes[i].tokens * unstakePercentage) / scale);
            if (reducedAmount > 0) {
                newStakes[newStakesCount] = Stakes({
                    tokens: reducedAmount,
                    timeStaked: u.stakes[i].timeStaked
                });
                newStakesCount++;
            }
        }

        // Clear existing stakes array.
        while (u.stakes.length > 0) {
            u.stakes.pop();
        }

        // Add back the reduced stakes.
        for (uint256 i = 0; i < newStakesCount; i++) {
            u.stakes.push(newStakes[i]);
        }

        // Transfer the unstaked tokens back to the user.
        stakingToken.safeTransfer(msg.sender, amount);

        emit TicketsUnstaked(msg.sender, ticketsToRemove, amount);
    }

    /**
     * @dev Internal function to remove a participant from the participants array.
     * @param participant The address of the participant to remove.
     */
    function _removeParticipant(address participant) internal {
        uint256 length = participants.length;
        for (uint256 i = 0; i < length; i++) {
            if (participants[i] == participant) {
                participants[i] = participants[length - 1];
                participants.pop();
                break;
            }
        }
    }

    // -------------------------------------------------------
    // View Functions
    // -------------------------------------------------------

    /**
     * @notice Calculates a user's weighted ticket count based on their stakes.
     * @dev Weight is calculated as sum((tokens * timeStaked) / 8640000) for all stakes.
     * @param user The address of the user.
     * @return weight The total weighted tickets of the user.
     */
    function getUserWeight(address user) public view returns (uint256 weight) {
        User memory u = users[user];
        uint256 currentTime = block.timestamp;

        for (uint256 i = 0; i < u.stakes.length; i++) {
            uint256 stakedTime = currentTime - u.stakes[i].timeStaked;
            weight += ((u.stakes[i].tokens * stakedTime) / 8640000); // Adjusted for decimals
        }

        return weight;
    }

    /**
     * @notice Retrieves the stakes of a specific user.
     * @param user The address of the user whose stakes are being queried.
     * @return An array of Stakes structures representing the user's stakes.
     */
    function getUserStakes(
        address user
    ) external view returns (Stakes[] memory) {
        return users[user].stakes;
    }

    /**
     * @notice Retrieves the total number of tickets a user has, including bonus tickets.
     * @param user The address of the user whose tickets are being queried.
     * @return amount The total number of tickets the user has, including any bonus tickets.
     */
    function getUserTickets(address user) public view returns (uint256 amount) {
        return (users[user].tickets + users[user].bonus);
    }

    /**
     * @notice Retrieves the total value of tokens held by a user based on their ticket count.
     * @param user The address of the user whose tokens are being queried.
     * @return The total value of tokens held by the user.
     */
    function getUserTokens(address user) external view returns (uint256) {
        return users[user].tickets * ticketPrice;
    }

    /**
     * @notice Returns the total number of tickets sold in the current raffle.
     * @return The total count of tickets sold.
     */
    function getTotalTickets() public view returns (uint256) {
        return totalTickets;
    }

    /**
     * @notice Returns the staking token balance of a given user.
     * @param user The address of the user whose staking token balance is to be retrieved.
     * @return The staking token balance of the user.
     */
    function getStakingTokenBalance(
        address user
    ) external view returns (uint256) {
        return stakingToken.balanceOf(user);
    }

    /**
     * @notice Returns the total value of tokens from tickets sold in the current raffle.
     * @return The total value of tokens based on ticket sales.
     */
    function getTotalTokens() external view returns (uint256) {
        uint256 totalTokens = 0;
        for (uint256 i = 0; i < participants.length; i++) {
            totalTokens += users[participants[i]].tickets * ticketPrice;
        }
        return totalTokens;
    }

    /**
     * @notice Returns the current prize distribution array.
     * @return The prize distribution array (in percentages).
     */
    function getPrizeDistribution() external view returns (uint256[] memory) {
        return prizeDistribution;
    }

    /**
     * @notice Returns the current prize pool in USDC.
     * @return The total prize pool.
     */
    function getPrizePool() external view returns (uint256) {
        return prizePool;
    }

    /**
     * @notice Calculates the total weighted sum of all participant tickets in the current raffle.
     * @return The total weighted sum of tickets.
     */
    function getTotalWeight() public view returns (uint256) {
        uint256 totalWeighted;
        for (uint256 i = 0; i < participants.length; i++) {
            totalWeighted += getUserWeight(participants[i]);
        }
        return totalWeighted;
    }

    /**
     * @notice Returns the number of participants in the current raffle.
     * @return The total count of participants.
     */
    function getNumberOfParticipants() external view returns (uint256) {
        return participants.length;
    }

    /**
     * @notice Checks if the raffle is currently active.
     * @return True if the current time is before the raffle end time, false otherwise.
     */
    function raffleActive() public view returns (bool) {
        return block.timestamp < raffleEndTime;
    }

    /**
     * @notice Retrieves the list of winners selected after the raffle ended.
     * @return An array of addresses representing the winners.
     */
    function getWinners() external view returns (address[] memory) {
        return winners;
    }

    /**
     * @notice Returns the prize amount allocated for a given winner address.
     * @param winner The address of the winner.
     * @return The prize amount in USDC.
     */
    function getWinnerPrize(address winner) external view returns (uint256) {
        return winnerPrize[winner];
    }

    // -------------------------------------------------------
    // Admin Functions
    // -------------------------------------------------------

    /**
     * @notice Allows the admin to withdraw unclaimed USDC funds after a certain delay post-raffle.
     * @dev Ensures users have time to claim their prizes and unstake before admin withdraws remaining funds.
     */
    function withdrawUnclaimedFunds() external onlyOwner nonReentrant {
        require(
            !raffleActive() && prizesDistributed,
            "VerticalAIRaffle: Raffle not ended or not distributed"
        );
        require(
            block.timestamp > lastRaffleEndTimestamp + UNCLAIMED_WITHDRAW_DELAY,
            "VerticalAIRaffle: Too early to withdraw"
        );

        uint256 balance = usdcToken.balanceOf(address(this));
        // Admin withdraws any remaining unclaimed USDC after the grace period.
        usdcToken.safeTransfer(owner(), balance);

        emit UnclaimedFundsWithdrawn(owner(), balance);
    }

    /**
     * @notice Allows the admin to withdraw any ERC20 token from the contract except USDC.
     * @param tokenAddress The address of the ERC20 token to withdraw.
     * @param amount The amount of the ERC20 token to withdraw.
     */
    function emergencyWithdraw(
        address tokenAddress,
        uint256 amount
    ) external onlyOwner nonReentrant {
        require(
            tokenAddress != address(usdcToken),
            "VerticalAIRaffle: Cannot withdraw USDC"
        );

        IERC20 token = IERC20(tokenAddress);
        uint256 balance = token.balanceOf(address(this));
        require(
            amount <= balance,
            "VerticalAIRaffle: Insufficient token balance"
        );

        token.safeTransfer(owner(), amount);

        emit EmergencyWithdraw(owner(), tokenAddress, amount);
    }

    /**
     * @notice Allows the admin to withdraw ETH from the contract.
     * @param amount The amount of ETH to withdraw.
     */
    function emergencyWithdrawETH(
        uint256 amount
    ) external onlyOwner nonReentrant {
        uint256 balance = address(this).balance;
        require(
            amount <= balance,
            "VerticalAIRaffle: Insufficient ETH balance"
        );

        (bool success, ) = owner().call{value: amount}("");
        require(success, "VerticalAIRaffle: ETH transfer failed");

        emit EmergencyWithdrawETH(owner(), amount);
    }

    /**
     * @notice Allows the admin to change the staking token.
     * @param _stakingToken The address of the new staking token.
     */
    function setStakingToken(address _stakingToken) external onlyOwner {
        // Ensure the staking token address is not the zero address.
        require(
            _stakingToken != address(0),
            "VerticalAIRaffle: Invalid staking token"
        );

        stakingToken = IERC20(_stakingToken);
        emit StakingTokenChanged(_stakingToken);
    }

    /**
     * @notice Allows the admin to change the VRF settings.
     * @param _callbackGasLimit The new callback gas limit.
     * @param _requestConfirmations The new number of request confirmations.
     */
    function setVRFSettings(
        uint32 _callbackGasLimit,
        uint16 _requestConfirmations
    ) external onlyOwner {
        require(
            _callbackGasLimit > 0,
            "VerticalAIRaffle: Invalid callback gas limit"
        );
        require(
            _requestConfirmations > 0,
            "VerticalAIRaffle: Invalid request confirmations"
        );
        // Set the new callback gas limit.
        callbackGasLimit = _callbackGasLimit;
        // Set the new number of request confirmations.
        requestConfirmations = _requestConfirmations;
        // Reset random request flag to allow future requests.
        randomRequested = false;

        // Emit an event for the VRF settings change.
        emit VRFSettingsChanged(_callbackGasLimit, _requestConfirmations);
    }

    /**
     * @notice Calculates the sum of the prize distribution percentages.
     * @param _prizeDistribution The prize distribution percentages.
     * @return The sum of the prize distribution percentages.
     */
    function _sumPrizeDistribution(
        uint256[] memory _prizeDistribution
    ) internal pure returns (uint256) {
        uint256 sum = 0;
        for (uint256 i = 0; i < _prizeDistribution.length; i++) {
            sum += _prizeDistribution[i];
        }
        return sum;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._initialized = 1;
        if (isTopLevelCall) {
            $._initializing = true;
        }
        _;
        if (isTopLevelCall) {
            $._initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._initialized = version;
        $._initializing = true;
        _;
        $._initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

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

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    /// @custom:storage-location erc7201:openzeppelin.storage.ReentrancyGuard
    struct ReentrancyGuardStorage {
        uint256 _status;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant ReentrancyGuardStorageLocation = 0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00;

    function _getReentrancyGuardStorage() private pure returns (ReentrancyGuardStorage storage $) {
        assembly {
            $.slot := ReentrancyGuardStorageLocation
        }
    }

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

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        $._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 {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // 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 {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // 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) {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        return $._status == ENTERED;
    }
}

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

pragma solidity ^0.8.20;

import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Ownable
    struct OwnableStorage {
        address _owner;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Ownable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant OwnableStorageLocation = 0x9016d09d72d40fdae2fd8ceac6b6234c7706214fd39c1cd1e609a0528c199300;

    function _getOwnableStorage() private pure returns (OwnableStorage storage $) {
        assembly {
            $.slot := OwnableStorageLocation
        }
    }

    /**
     * @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.
     */
    function __Ownable_init(address initialOwner) internal onlyInitializing {
        __Ownable_init_unchained(initialOwner);
    }

    function __Ownable_init_unchained(address initialOwner) internal onlyInitializing {
        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) {
        OwnableStorage storage $ = _getOwnableStorage();
        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 {
        OwnableStorage storage $ = _getOwnableStorage();
        address oldOwner = $._owner;
        $._owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 v5.1.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";
import {Address} from "../../../utils/Address.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 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
pragma solidity ^0.8.0;

import {LinkTokenInterface} from "../../shared/interfaces/LinkTokenInterface.sol";
import {IVRFV2PlusWrapper} from "./interfaces/IVRFV2PlusWrapper.sol";

/**
 *
 * @notice Interface for contracts using VRF randomness through the VRF V2 wrapper
 * ********************************************************************************
 * @dev PURPOSE
 *
 * @dev Create VRF V2+ requests without the need for subscription management. Rather than creating
 * @dev and funding a VRF V2+ subscription, a user can use this wrapper to create one off requests,
 * @dev paying up front rather than at fulfillment.
 *
 * @dev Since the price is determined using the gas price of the request transaction rather than
 * @dev the fulfillment transaction, the wrapper charges an additional premium on callback gas
 * @dev usage, in addition to some extra overhead costs associated with the VRFV2Wrapper contract.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFV2PlusWrapperConsumerBase. The consumer must be funded
 * @dev with enough LINK or ether to make the request, otherwise requests will revert. To request randomness,
 * @dev call the 'requestRandomWords' function with the desired VRF parameters. This function handles
 * @dev paying for the request based on the current pricing.
 *
 * @dev Consumers must implement the fullfillRandomWords function, which will be called during
 * @dev fulfillment with the randomness result.
 */
abstract contract VRFV2PlusWrapperConsumerBase {
  error OnlyVRFWrapperCanFulfill(address have, address want);

  LinkTokenInterface internal immutable i_linkToken;
  IVRFV2PlusWrapper public immutable i_vrfV2PlusWrapper;

  /**
   * @param _vrfV2PlusWrapper is the address of the VRFV2Wrapper contract
   */
  constructor(address _vrfV2PlusWrapper) {
    IVRFV2PlusWrapper vrfV2PlusWrapper = IVRFV2PlusWrapper(_vrfV2PlusWrapper);

    i_linkToken = LinkTokenInterface(vrfV2PlusWrapper.link());
    i_vrfV2PlusWrapper = vrfV2PlusWrapper;
  }

  /**
   * @dev Requests randomness from the VRF V2+ wrapper.
   *
   * @param _callbackGasLimit is the gas limit that should be used when calling the consumer's
   *        fulfillRandomWords function.
   * @param _requestConfirmations is the number of confirmations to wait before fulfilling the
   *        request. A higher number of confirmations increases security by reducing the likelihood
   *        that a chain re-org changes a published randomness outcome.
   * @param _numWords is the number of random words to request.
   *
   * @return requestId is the VRF V2+ request ID of the newly created randomness request.
   */
  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function requestRandomness(
    uint32 _callbackGasLimit,
    uint16 _requestConfirmations,
    uint32 _numWords,
    bytes memory extraArgs
  ) internal returns (uint256 requestId, uint256 reqPrice) {
    reqPrice = i_vrfV2PlusWrapper.calculateRequestPrice(_callbackGasLimit, _numWords);
    i_linkToken.transferAndCall(
      address(i_vrfV2PlusWrapper),
      reqPrice,
      abi.encode(_callbackGasLimit, _requestConfirmations, _numWords, extraArgs)
    );
    return (i_vrfV2PlusWrapper.lastRequestId(), reqPrice);
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function requestRandomnessPayInNative(
    uint32 _callbackGasLimit,
    uint16 _requestConfirmations,
    uint32 _numWords,
    bytes memory extraArgs
  ) internal returns (uint256 requestId, uint256 requestPrice) {
    requestPrice = i_vrfV2PlusWrapper.calculateRequestPriceNative(_callbackGasLimit, _numWords);
    return (
      i_vrfV2PlusWrapper.requestRandomWordsInNative{value: requestPrice}(
        _callbackGasLimit,
        _requestConfirmations,
        _numWords,
        extraArgs
      ),
      requestPrice
    );
  }

  /**
   * @notice fulfillRandomWords handles the VRF V2 wrapper response. The consuming contract must
   * @notice implement it.
   *
   * @param _requestId is the VRF V2 request ID.
   * @param _randomWords is the randomness result.
   */
  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function fulfillRandomWords(uint256 _requestId, uint256[] memory _randomWords) internal virtual;

  function rawFulfillRandomWords(uint256 _requestId, uint256[] memory _randomWords) external {
    address vrfWrapperAddr = address(i_vrfV2PlusWrapper);
    if (msg.sender != vrfWrapperAddr) {
      revert OnlyVRFWrapperCanFulfill(msg.sender, vrfWrapperAddr);
    }
    fulfillRandomWords(_requestId, _randomWords);
  }

  /// @notice getBalance returns the native balance of the consumer contract
  function getBalance() public view returns (uint256) {
    return address(this).balance;
  }

  /// @notice getLinkToken returns the link token contract
  function getLinkToken() public view returns (LinkTokenInterface) {
    return i_linkToken;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

// End consumer library.
library VRFV2PlusClient {
  // extraArgs will evolve to support new features
  bytes4 public constant EXTRA_ARGS_V1_TAG = bytes4(keccak256("VRF ExtraArgsV1"));
  struct ExtraArgsV1 {
    bool nativePayment;
  }

  struct RandomWordsRequest {
    bytes32 keyHash;
    uint256 subId;
    uint16 requestConfirmations;
    uint32 callbackGasLimit;
    uint32 numWords;
    bytes extraArgs;
  }

  function _argsToBytes(ExtraArgsV1 memory extraArgs) internal pure returns (bytes memory bts) {
    return abi.encodeWithSelector(EXTRA_ARGS_V1_TAG, extraArgs);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    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 v5.1.0) (interfaces/IERC1363.sol)

pragma solidity ^0.8.20;

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 v5.1.0) (utils/Address.sol)

pragma solidity ^0.8.20;

import {Errors} from "./Errors.sol";

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert Errors.InsufficientBalance(address(this).balance, amount);
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert Errors.FailedCall();
        }
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {Errors.FailedCall} error.
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert Errors.InsufficientBalance(address(this).balance, value);
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {Errors.FailedCall}) in case
     * of an unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {Errors.FailedCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {Errors.FailedCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            assembly ("memory-safe") {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert Errors.FailedCall();
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// solhint-disable-next-line interface-starts-with-i
interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);

  function approve(address spender, uint256 value) external returns (bool success);

  function balanceOf(address owner) external view returns (uint256 balance);

  function decimals() external view returns (uint8 decimalPlaces);

  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);

  function increaseApproval(address spender, uint256 subtractedValue) external;

  function name() external view returns (string memory tokenName);

  function symbol() external view returns (string memory tokenSymbol);

  function totalSupply() external view returns (uint256 totalTokensIssued);

  function transfer(address to, uint256 value) external returns (bool success);

  function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool success);

  function transferFrom(address from, address to, uint256 value) external returns (bool success);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IVRFV2PlusWrapper {
  /**
   * @return the request ID of the most recent VRF V2 request made by this wrapper. This should only
   * be relied option within the same transaction that the request was made.
   */
  function lastRequestId() external view returns (uint256);

  /**
   * @notice Calculates the price of a VRF request with the given callbackGasLimit at the current
   * @notice block.
   *
   * @dev This function relies on the transaction gas price which is not automatically set during
   * @dev simulation. To estimate the price at a specific gas price, use the estimatePrice function.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   * @param _numWords is the number of words to request.
   */
  function calculateRequestPrice(uint32 _callbackGasLimit, uint32 _numWords) external view returns (uint256);

  /**
   * @notice Calculates the price of a VRF request in native with the given callbackGasLimit at the current
   * @notice block.
   *
   * @dev This function relies on the transaction gas price which is not automatically set during
   * @dev simulation. To estimate the price at a specific gas price, use the estimatePrice function.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   * @param _numWords is the number of words to request.
   */
  function calculateRequestPriceNative(uint32 _callbackGasLimit, uint32 _numWords) external view returns (uint256);

  /**
   * @notice Estimates the price of a VRF request with a specific gas limit and gas price.
   *
   * @dev This is a convenience function that can be called in simulation to better understand
   * @dev pricing.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   * @param _numWords is the number of words to request.
   * @param _requestGasPriceWei is the gas price in wei used for the estimation.
   */
  function estimateRequestPrice(
    uint32 _callbackGasLimit,
    uint32 _numWords,
    uint256 _requestGasPriceWei
  ) external view returns (uint256);

  /**
   * @notice Estimates the price of a VRF request in native with a specific gas limit and gas price.
   *
   * @dev This is a convenience function that can be called in simulation to better understand
   * @dev pricing.
   *
   * @param _callbackGasLimit is the gas limit used to estimate the price.
   * @param _numWords is the number of words to request.
   * @param _requestGasPriceWei is the gas price in wei used for the estimation.
   */
  function estimateRequestPriceNative(
    uint32 _callbackGasLimit,
    uint32 _numWords,
    uint256 _requestGasPriceWei
  ) external view returns (uint256);

  /**
   * @notice Requests randomness from the VRF V2 wrapper, paying in native token.
   *
   * @param _callbackGasLimit is the gas limit for the request.
   * @param _requestConfirmations number of request confirmations to wait before serving a request.
   * @param _numWords is the number of words to request.
   */
  function requestRandomWordsInNative(
    uint32 _callbackGasLimit,
    uint16 _requestConfirmations,
    uint32 _numWords,
    bytes calldata extraArgs
  ) external payable returns (uint256 requestId);

  function link() external view returns (address);
  function linkNativeFeed() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC20.sol)

pragma solidity ^0.8.20;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)

pragma solidity ^0.8.20;

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

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

pragma solidity ^0.8.20;

/**
 * @dev Collection of common custom errors used in multiple contracts
 *
 * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
 * It is recommended to avoid relying on the error API for critical functionality.
 *
 * _Available since v5.1._
 */
library Errors {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error InsufficientBalance(uint256 balance, uint256 needed);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedCall();

    /**
     * @dev The deployment failed.
     */
    error FailedDeployment();

    /**
     * @dev A necessary precompile is missing.
     */
    error MissingPrecompile(address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @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);
}

{
  "remappings": [
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@chainlink/=lib/chainlink/contracts/",
    "chainlink/=lib/chainlink/",
    "ds-test/=lib/openzeppelin-contracts-upgradeable/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"users","outputs":[{"internalType":"uint256","name":"tickets","type":"uint256"},{"internalType":"uint256","name":"bonus","type":"uint256"},{"internalType":"bool","name":"hasClaimed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"winnerPrize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"winners","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawUnclaimedFunds","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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