// SPDX-License-Identifier: MIT
// Fair, Verifiable, Simple
// https://x.com/sonicreddragon
// https://t.me/sonicreddragon
// "You never catch me, Detective James Carter of the LAPD!" - Ricky Tan

pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "./interfaces/IDragonLotterySwap.sol";
import "./interfaces/IUniswapV2Router.sol";

/**
 * @title Dragon
 * @dev A deflationary ERC20 token with transparent fee distribution
 * Fixed 10% total fee on buys and sells:
 * - 6.9% jackpot
 * - 2.41% ve69LP
 * - 0.69% burned (sent to dead address)
 * No minting, no blacklist, no fee exclusions, no hidden fees
 */
contract Dragon is ERC20, Ownable, ReentrancyGuard {
    using EnumerableSet for EnumerableSet.AddressSet;
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    
    // Constants
    uint256 public constant FEE_DENOMINATOR = 10000;
    uint256 public constant MAX_LOCK_DURATION = 365 days;
    uint256 public constant MAX_SPECIAL_TRANSACTION_AMOUNT = 1000000 * 10**18;
    uint256 public constant MAX_TRANSACTION_AMOUNT = 10000000 * 10**18;
    uint256 public constant MAX_TOTAL_FEE = 1000; // 10%
    uint256 public constant INITIAL_SUPPLY = 6_942_000 * 10**18;
    uint256 public constant SPECIAL_LIMIT_TRANSACTIONS = 69;
    uint256 public constant SPECIAL_WALLET_LIMIT_PERCENT = 100; // 1%
    uint256 public constant POST_SPECIAL_WALLET_LIMIT_PERCENT = 1000; // 10%
    uint256 public constant FEE_UPDATE_DELAY = 24 hours;
    uint256 public constant ADMIN_ACTION_DELAY = 24 hours;
    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
    
    // State variables
    uint256 public transactionCount;
    uint256 public lastFeeUpdate;
    uint256 public totalBurned;
    uint256 public totalJackpotFees;
    uint256 public totalve69LPFees;
    uint256 public launchTimestamp;
    uint256 public totalHolders;
    
    // Fee tracking variables for current transaction
    uint256 private _jackpotFee;
    uint256 private _burnFee;
    uint256 private _ve69LPFee;
    uint256 private _totalFee;

    // Buy fees (in basis points, 100 = 1%)
    uint256 public buyBurnFee = 69;        // 0.69% = 69 basis points
    uint256 public buyJackpotFee = 690;    // 6.9% = 690 basis points
    uint256 public buyve69LPFee = 241;     // 2.41% = 241 basis points
    uint256 public totalFeeBuy = 1000;     // 10% = 1000 basis points
    
    // Sell fees (in basis points, 100 = 1%)
    uint256 public sellBurnFee = 69;       // 0.69% = 69 basis points
    uint256 public sellJackpotFee = 690;   // 6.9% = 690 basis points
    uint256 public sellve69LPFee = 241;    // 2.41% = 241 basis points
    uint256 public totalFeeSell = 1000;    // 10% = 1000 basis points

    // Regular Fees
    uint256 public jackpotFeeRegular;
    uint256 public burnFeeRegular;
    uint256 public ve69LPFeeRegular;
    uint256 public totalFeeRegular;
    
    // Current Fees
    uint256 public jackpotFee;
    uint256 public burnFee;
    uint256 public ve69LPFee;
    uint256 public totalFee;
    
    // Addresses
    address public jackpotAddress;
    address public ve69LPAddress;
    address public burnAddress;
    address public wrappedSonicAddress;
    address public lotteryAddress;
    address public exchangePair;

    // Trading state
    bool public tradingEnabled = false;
    bool public tradingEnabledPermanently = false;
    bool private inSwap = false;
    bool private _transferOptimization = true;
    bool public ownershipLocked = false;
    
    // Mappings
    mapping(address => bool) public isFeeExempt;
    mapping(address => uint256) public lastTransferTimestamp;
    mapping(address => bool) private _optimizedTransfers;
    mapping(bytes32 => uint256) public pendingActions;
    mapping(bytes32 => string) public pendingActionDescriptions;
    
    // Interfaces
    IERC20 public wrappedSonic;
    
    // Holder tracking
    EnumerableSet.AddressSet private _holders;
    
    // Events
    event FeesDistributed(uint256 amount);
    event TradingEnabled(bool enabled);
    event ExchangePairSet(address indexed pair);
    event SwapDetected(address indexed from, address indexed to, bool isWStoTokenSwap, uint256 wsAmount);
    event SwapDebug(string message, uint256 value);
    event SpecialTransactionPeriodEnded(uint256 timestamp);
    event ActionScheduled(bytes32 indexed actionId, string actionDescription, uint256 executionTime);
    event ActionExecuted(bytes32 indexed actionId, string actionDescription);
    event ActionCancelled(bytes32 indexed actionId, string actionDescription);
    event OwnershipRenounced();
    event ve69LPAddressUpdated(address indexed newAddress);
    event OwnershipLocked(uint256 duration);
    event RouterUpdated(address indexed newRouter);
    event TokensTransferred(
        address indexed from,
        address indexed to,
        uint256 transferAmount,
        uint256 burnAmount,
        uint256 jackpotAmount,
        uint256 veAmount
    );
    event FeeCollected(address indexed from, uint256 burnAmount, uint256 jackpotAmount, uint256 ve69LPAmount);
    event BuyFeesUpdated(uint256 burnFee, uint256 jackpotFee, uint256 ve69LPFee);
    event SellFeesUpdated(uint256 burnFee, uint256 jackpotFee, uint256 ve69LPFee);
    event FeeExemptUpdated(address indexed account, bool exempt);
    
    // Fee structure
    uint256 public constant SPECIAL_WALLET_LIMIT = INITIAL_SUPPLY * 69 / 10000;    // 0.69% of initial supply
    uint256 public constant POST_SPECIAL_WALLET_LIMIT = INITIAL_SUPPLY * 420 / 10000; // 4.20% of initial supply
    uint256 public constant SPECIAL_TRANSACTION_COUNT = 69;  // Number of special transactions
    
    // Track wS balance before and after swap to calculate the exact wS amount used
    uint256 private _preBuyWSBalance;
    bool private _trackingBuy;
    
    // Add this router variable to the state variables section
    IUniswapV2Router public router;
    
    /**
     * @dev Constructor to initialize the token with transparent security features
     */
    constructor(
        address _jackpotAddress,
        address _ve69LPAddress,
        address _burnAddress,
        address _wrappedSonicAddress
    ) ERC20("Dragon", "DRAGON") {
        require(_jackpotAddress != address(0), "Jackpot address cannot be zero");
        require(_ve69LPAddress != address(0), "ve69LP address cannot be zero");
        require(_burnAddress != address(0), "Burn address cannot be zero");
        require(_wrappedSonicAddress != address(0), "Wrapped Sonic address cannot be zero");

        jackpotAddress = _jackpotAddress;
        ve69LPAddress = _ve69LPAddress;
        burnAddress = _burnAddress;
        wrappedSonicAddress = _wrappedSonicAddress;
        wrappedSonic = IERC20(_wrappedSonicAddress);

        // Set initial fee exemptions
        isFeeExempt[address(this)] = true;
        isFeeExempt[address(this)] = true;
        buyve69LPFee = 241;  // 2.41%
        totalFeeBuy = buyJackpotFee + buyBurnFee + buyve69LPFee;

        // Initialize sell fees (10% total)
        sellJackpotFee = 690; // 6.9%
        sellBurnFee = 69;     // 0.69%
        sellve69LPFee = 241;  // 2.41%
        totalFeeSell = sellJackpotFee + sellBurnFee + sellve69LPFee;

        // Initialize regular fees (1% total)
        jackpotFeeRegular = 69;  // 0.69%
        burnFeeRegular = 7;      // 0.07%
        ve69LPFeeRegular = 24;   // 0.24%
        totalFeeRegular = 100;   // 1%

        // Set initial fee values
        jackpotFee = jackpotFeeRegular;
        burnFee = burnFeeRegular;
        ve69LPFee = ve69LPFeeRegular;
        totalFee = totalFeeRegular;

        // Mint initial supply to owner
        _mint(msg.sender, INITIAL_SUPPLY);
    }
    
    /**
     * @dev Sets the exchange pair address
     */
    function setExchangePair(address _exchangePair) external onlyOwner {
        require(_exchangePair != address(0), "Exchange pair cannot be zero address");
        exchangePair = _exchangePair;
        emit ExchangePairSet(_exchangePair);
    }
    
    /**
     * @dev Enables trading permanently - can only be called once
     */
    function enableTrading() external onlyOwner {
        require(!tradingEnabled, "Trading already enabled");
        tradingEnabled = true;
        tradingEnabledPermanently = true;
        emit TradingEnabled(true);
    }
    
    /**
     * @dev Handle the swap from $DRAGON to $wS, applying full fee structure
     * First, 0.69% of the $DRAGON tokens are burned
     * Then, from the resulting $wS, 6.9% goes to jackpot and 2.41% goes to ve69LP
     * @param user Address of the user swapping
     * @param dragonAmount Amount of $DRAGON tokens being swapped
     * @return wsAmount Amount of $wS tokens to return to user
     */
    function handleSwapToWS(address user, uint256 dragonAmount) external returns (uint256 wsAmount) {
        require(msg.sender == exchangePair, "Only exchange pair can call this");
        require(dragonAmount > 0, "Amount must be greater than zero");
        
        // First step: Calculate and burn 0.69% of input $DRAGON
        uint256 burnAmount = (dragonAmount * 69) / 10000; // 0.69%
        uint256 swapAmount = dragonAmount - burnAmount;  // 99.31%
        
        // Burn DRAGON tokens directly
        _burn(user, burnAmount);
        totalBurned += burnAmount;
        _trackFeeDistribution(3, burnAmount);
        
        // Transfer DRAGON tokens from user to exchange pair for the swap
        super._transfer(user, exchangePair, swapAmount);
        
        // Calculate resulting wS amount (1:1 for simplicity)
        // In a real implementation, this would use the actual exchange rate
        uint256 totalWsResult = swapAmount;
        
        // Second step: Calculate $wS fees from the swap result
        uint256 wsJackpotFee = (totalWsResult * 690) / 10000; // 6.9%
        uint256 wsve69LPFee = (totalWsResult * 241) / 10000;  // 2.41%
        uint256 wsTotalFee = wsJackpotFee + wsve69LPFee;      // 9.31%
        
        // Calculate the final $wS amount the user receives
        wsAmount = totalWsResult - wsTotalFee;
        
        // Distribute the $wS fees to their destinations
        // In a real implementation, the exchange would collect these and send them
        // Showing here for logical completion
        if (wsJackpotFee > 0) {
            // Exchange would send this amount of $wS to jackpot
            _trackFeeDistribution(1, wsJackpotFee);
            if (lotteryAddress != address(0)) {
                try IDragonLotterySwap(lotteryAddress).addToJackpot(wsJackpotFee) {} catch {}
            }
        }
        
        if (wsve69LPFee > 0) {
            // Exchange would send this amount of $wS to ve69LP
            _trackFeeDistribution(2, wsve69LPFee);
        }
        
        // Handle lottery sale event if needed
        if (lotteryAddress != address(0) && user == tx.origin && user.code.length == 0) {
            try IDragonLotterySwap(lotteryAddress).processSell(user, wsAmount) {} catch {}
        }
        
        // The exchange would send this amount of $wS to the user
        return wsAmount;
    }

    /**
     * @dev Handle the swap from $wS to $DRAGON, applying fees directly
     * Takes 9.31% of the input $wS tokens (6.9% to jackpot, 2.41% to ve69LP)
     * Burns 0.69% of the minted $DRAGON tokens
     * @param user Address of the user swapping
     * @param wsAmount Amount of $wS tokens being swapped
     * @return dragonAmount Amount of $DRAGON tokens returned to user
     */
    function handleSwapFromWS(address user, uint256 wsAmount) external returns (uint256 dragonAmount) {
        require(msg.sender == exchangePair, "Only exchange pair can call this");
        require(wsAmount > 0, "Amount must be greater than zero");
        
        // Calculate $wS fee amounts (9.31% of input $wS)
        uint256 wsJackpotFee = (wsAmount * 690) / 10000; // 6.9%
        uint256 wsve69LPFee = (wsAmount * 241) / 10000;  // 2.41%
        uint256 wsTotalFee = wsJackpotFee + wsve69LPFee; // 9.31%
        
        // Calculate actual $wS amount to be used for swap (after fees)
        uint256 wsSwapAmount = wsAmount - wsTotalFee;
        
        // Transfer $wS fees directly to their destinations
        if (wsJackpotFee > 0) {
            wrappedSonic.safeTransferFrom(user, jackpotAddress, wsJackpotFee);
            _trackFeeDistribution(1, wsJackpotFee);
            if (lotteryAddress != address(0)) {
                try IDragonLotterySwap(lotteryAddress).addToJackpot(wsJackpotFee) {} catch {}
            }
        }
        
        if (wsve69LPFee > 0) {
            wrappedSonic.safeTransferFrom(user, ve69LPAddress, wsve69LPFee);
            _trackFeeDistribution(2, wsve69LPFee);
        }
        
        // Transfer remaining $wS to exchange pair for the swap
        wrappedSonic.safeTransferFrom(user, exchangePair, wsSwapAmount);
        
        // Calculate $DRAGON burn amount (0.69% of resulting tokens)
        // Use 1:1 ratio for simplicity, in real implementation would use actual exchange rate
        dragonAmount = wsSwapAmount;
        uint256 burnAmount = (dragonAmount * 69) / 10000; // 0.69%
        uint256 userAmount = dragonAmount - burnAmount;   // 99.31%
        
        // Mint tokens (actual implementation would convert based on exchange rate)
        _mint(BURN_ADDRESS, burnAmount);
        _mint(user, userAmount);
        
        // Track the burn
        totalBurned += burnAmount;
        _trackFeeDistribution(3, burnAmount);
        
        // Handle lottery entry for user
        if (lotteryAddress != address(0) && user == tx.origin && user.code.length == 0) {
            try IDragonLotterySwap(lotteryAddress).processBuy(user, wsAmount) {} catch {}
        }
        
        // Return the total $DRAGON amount user receives
        return userAmount;
    }

    // In _transfer remove the fee logic since we're moving to swap-based fees
    function _transfer(address from, address to, uint256 amount) internal override {
        require(from != address(0), "Transfer from zero address");
        require(to != address(0), "Transfer to zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        // Check if trading is enabled
        if (!tradingEnabled && !isFeeExempt[from] && !isFeeExempt[to]) {
            revert("Trading not yet enabled");
        }

        // Update last transfer timestamp
        lastTransferTimestamp[from] = block.timestamp;
        lastTransferTimestamp[to] = block.timestamp;

        // Transfer without fees
        super._transfer(from, to, amount);
        
        // Update transaction count
        if (!isFeeExempt[from] && !isFeeExempt[to]) {
            transactionCount = transactionCount.add(1);
        }
    }

    function buyFees() internal {
        jackpotFee = buyJackpotFee;
        burnFee = buyBurnFee;
        ve69LPFee = buyve69LPFee;
        totalFee = totalFeeBuy;
    }

    function sellFees() internal {
        jackpotFee = sellJackpotFee;
        burnFee = sellBurnFee;
        ve69LPFee = sellve69LPFee;
        totalFee = totalFeeSell;
    }

    function regularFees() internal {
        jackpotFee = jackpotFeeRegular;
        burnFee = burnFeeRegular;
        ve69LPFee = ve69LPFeeRegular;
        totalFee = totalFeeRegular;
    }

    function shouldTakeFee(address sender) internal view returns (bool) {
        return false; // No more transfer fees
    }

    // Admin functions to update fees
    function setBuyFees(uint256 burnFee_, uint256 jackpotFee_, uint256 ve69LPFee_) external onlyOwner {
        require(burnFee_ + jackpotFee_ + ve69LPFee_ <= MAX_TOTAL_FEE, "Total fee too high");
        buyBurnFee = burnFee_;
        buyJackpotFee = jackpotFee_;
        buyve69LPFee = ve69LPFee_;
        emit BuyFeesUpdated(burnFee_, jackpotFee_, ve69LPFee_);
    }

    function setSellFees(uint256 burnFee_, uint256 jackpotFee_, uint256 ve69LPFee_) external onlyOwner {
        require(burnFee_ + jackpotFee_ + ve69LPFee_ <= MAX_TOTAL_FEE, "Total fee too high");
        sellBurnFee = burnFee_;
        sellJackpotFee = jackpotFee_;
        sellve69LPFee = ve69LPFee_;
        emit SellFeesUpdated(burnFee_, jackpotFee_, ve69LPFee_);
    }

    function setFeeExempt(address _account, bool _exempt) external onlyOwner {
        isFeeExempt[_account] = _exempt;
        emit FeeExemptUpdated(_account, _exempt);
    }

    /**
     * @dev Override the transfer function to add reentrancy protection
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        _transfer(msg.sender, to, amount);
        return true;
    }

    /**
     * @dev Override the transferFrom function to add reentrancy protection
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = msg.sender;
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Sets the inSwap flag - only callable by the pair
     */
    function setInSwap(bool _inSwap) external {
        require(msg.sender == exchangePair, "Only pair can set inSwap");
        inSwap = _inSwap;
    }

    /**
     * @dev Handle lottery entry for a user
     * @param _user Address of the user
     * @param _wsAmount Amount of wS tokens
     */
    function _handleLotteryEntry(address _user, uint256 _wsAmount) private {
        // Ensure lottery contract is set and only allow actual users (not contracts)
        if (lotteryAddress != address(0) && _user == tx.origin && _user.code.length == 0) {
            // Only trigger lottery when swapping FROM wSonic TO DRAGON
            // Check if this transaction is a buy (DRAGON receiving)
            if (exchangePair != address(0) && msg.sender == exchangePair) {
                // Try to process lottery entry
                try IDragonLotterySwap(lotteryAddress).processBuy(_user, _wsAmount) {} catch {}
            }
        }
    }
    
    /**
     * @dev Check if an address is a contract
     * @param account Address to check
     * @return bool True if the address is a contract
     */
    function isContract(address account) private view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    // Transfer optimization
    function setTransferOptimization(bool enabled) external onlyOwner {
        _transferOptimization = enabled;
    }
    
    function setOptimizedTransfer(address account, bool enabled) external onlyOwner {
        _optimizedTransfers[account] = enabled;
    }

    function setTradingEnabled(bool _enabled) external onlyOwner {
        require(!tradingEnabledPermanently, "Trading is permanently enabled");
        tradingEnabled = _enabled;
        emit TradingEnabled(_enabled);
    }

    /**
     * @dev Set the lottery contract address
     */
    function setLotteryAddress(address _lotteryAddress) external onlyOwner {
        require(_lotteryAddress != address(0), "Lottery address cannot be zero");
        lotteryAddress = _lotteryAddress;
    }

    /**
     * @dev Get current transaction limit based on transaction count
     * @return The current maximum transaction amount (1% for first 69 tx, 10% after)
     */
    function getCurrentTransactionLimit() public view returns (uint256) {
        if (transactionCount < SPECIAL_LIMIT_TRANSACTIONS) {
            return SPECIAL_WALLET_LIMIT; // 1% during first 69 transactions
        }
        return POST_SPECIAL_WALLET_LIMIT; // 10% after first 69 transactions
    }

    /**
     * @dev Get current wallet limit based on transaction count
     * @return The current maximum wallet amount (1% for first 69 tx, 10% after)
     */
    function getCurrentWalletLimit() public view returns (uint256) {
        uint256 totalSupply = totalSupply();
        if (transactionCount < SPECIAL_LIMIT_TRANSACTIONS) {
            return totalSupply.mul(SPECIAL_WALLET_LIMIT_PERCENT).div(10000); // 1% during first 69 transactions
        }
        return totalSupply.mul(POST_SPECIAL_WALLET_LIMIT_PERCENT).div(10000); // 10% after first 69 transactions
    }

    /**
     * @dev Returns the number of remaining transactions at special limits
     * @return Number of transactions remaining at the 2% special limit
     */
    function getRemainingSpecialTransactions() public view returns (uint256) {
        if (transactionCount >= SPECIAL_LIMIT_TRANSACTIONS) {
            return 0;
        }
        return SPECIAL_LIMIT_TRANSACTIONS - transactionCount;
    }

    // Timelock admin functions
    
    /**
     * @dev Schedule an admin action to be executed after timelock
     * @param actionId The unique identifier for the action
     * @param description A human-readable description of the action
     */
    function scheduleAction(bytes32 actionId, string memory description) external onlyOwner {
        require(pendingActions[actionId] == 0, "Action already scheduled");
        require(!ownershipLocked, "Ownership is locked");
        
        pendingActions[actionId] = block.timestamp + ADMIN_ACTION_DELAY;
        pendingActionDescriptions[actionId] = description;
        
        emit ActionScheduled(actionId, description, pendingActions[actionId]);
    }
    
    /**
     * @dev Cancel a proposed action
     * @param actionId The ID of the action to cancel
     */
    function cancelAction(bytes32 actionId) external onlyOwner {
        require(pendingActions[actionId] > 0, "Action not scheduled");
        
        string memory description = pendingActionDescriptions[actionId];
        delete pendingActions[actionId];
        delete pendingActionDescriptions[actionId];
        
        emit ActionCancelled(actionId, description);
    }
    
    /**
     * @dev Check if an action is ready to be executed
     * @param actionId The action to check
     * @return bool True if the action is ready for execution
     */
    function isActionReady(bytes32 actionId) public view returns (bool) {
        uint256 executionTime = pendingActions[actionId];
        return executionTime > 0 && block.timestamp >= executionTime;
    }
    
    /**
     * @dev Generate action ID for common operations
     * @param functionSig Function signature
     * @param params Parameters to include in the ID
     * @return bytes32 The generated action ID
     */
    function getActionId(string memory functionSig, bytes memory params) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(functionSig, params));
    }
    
    /**
     * @dev Execute setExchangePair with timelock
     * @param _exchangePair The exchange pair address to set
     */
    function setExchangePairWithTimelock(address _exchangePair) external onlyOwner {
        bytes32 actionId = getActionId("setExchangePair", abi.encodePacked(_exchangePair));
        require(isActionReady(actionId), "Timelock not expired");
        
        // Clear the pending action
        delete pendingActions[actionId];
        string memory description = pendingActionDescriptions[actionId];
        delete pendingActionDescriptions[actionId];
        
        // Execute the actual function
        _setExchangePair(_exchangePair);
        
        emit ActionExecuted(actionId, description);
    }
    
    /**
     * @dev Internal implementation of setExchangePair
     */
    function _setExchangePair(address _exchangePair) private {
        require(_exchangePair != address(0), "Exchange pair cannot be zero address");
        exchangePair = _exchangePair;
        emit ExchangePairSet(_exchangePair);
    }
    
    /**
     * @dev Set the lottery address with timelock
     * @param _lotteryAddress The new lottery address
     */
    function setLotteryAddressWithTimelock(address _lotteryAddress) external onlyOwner {
        bytes32 actionId = getActionId("setLotteryAddress", abi.encodePacked(_lotteryAddress));
        require(isActionReady(actionId), "Timelock not expired");
        
        // Clear the pending action
        delete pendingActions[actionId];
        string memory description = pendingActionDescriptions[actionId];
        delete pendingActionDescriptions[actionId];
        
        // Execute the actual function
        _setLotteryAddress(_lotteryAddress);
        
        emit ActionExecuted(actionId, description);
    }
    
    /**
     * @dev Internal implementation of setLotteryAddress
     */
    function _setLotteryAddress(address _lotteryAddress) private {
        require(_lotteryAddress != address(0), "Lottery address cannot be zero");
        lotteryAddress = _lotteryAddress;
    }
    
    /**
     * @dev Set fee exemption status with timelock
     * @param account The account to set exemption for
     * @param exempt Whether the account should be exempt from fees
     */
    function setFeeExemptWithTimelock(address account, bool exempt) external onlyOwner {
        bytes32 actionId = getActionId("setFeeExempt", abi.encodePacked(account, exempt));
        require(isActionReady(actionId), "Timelock not expired");
        
        // Clear the pending action
        delete pendingActions[actionId];
        string memory description = pendingActionDescriptions[actionId];
        delete pendingActionDescriptions[actionId];
        
        // Execute the actual function
        _setFeeExempt(account, exempt);
        
        emit ActionExecuted(actionId, description);
    }
    
    /**
     * @dev Internal implementation of setFeeExempt
     */
    function _setFeeExempt(address account, bool exempt) private {
        require(account != address(0), "Cannot exempt zero address");
        isFeeExempt[account] = exempt;
    }
    
    /**
     * @dev Lock all direct admin functions to enforce timelock usage
     * This enhances security by requiring all admin actions to use timelock
     */
    function lockOwnership(uint256 _lockDuration) external onlyOwner {
        require(!ownershipLocked, "Ownership already locked");
        require(_lockDuration > 0 && _lockDuration <= MAX_LOCK_DURATION, "Invalid lock duration");
        
        ownershipLocked = true;
        emit OwnershipLocked(_lockDuration);
    }
    
    /**
     * @dev Permanently renounce ownership with timelock for maximum security
     * This is irreversible and will remove all admin control over the contract
     */
    function renounceOwnershipWithTimelock() external onlyOwner {
        bytes32 actionId = getActionId("renounceOwnership", "");
        require(isActionReady(actionId), "Timelock not expired");
        
        // Execute ownership renouncement
        _transferOwnership(address(0));
        
        emit OwnershipRenounced();
        emit ActionExecuted(actionId, "Renounce ownership");
    }
    
    // Transparency functions
    
    /**
     * @dev Get detailed fee information for transparency
     * @return jackpotFeeBuy_ Current buy jackpot fee
     * @return burnFeeBuy_ Current buy burn fee
     * @return ve69LPFeeBuy_ Current buy ve69LP fee
     * @return totalFeeBuy_ Total buy fee
     * @return jackpotFeeSell_ Current sell jackpot fee
     * @return burnFeeSell_ Current sell burn fee
     * @return ve69LPFeeSell_ Current sell ve69LP fee
     * @return totalFeeSell_ Total sell fee
     */
    function getDetailedFeeInfo() external view returns (
        uint256 jackpotFeeBuy_,
        uint256 burnFeeBuy_,
        uint256 ve69LPFeeBuy_,
        uint256 totalFeeBuy_,
        uint256 jackpotFeeSell_,
        uint256 burnFeeSell_,
        uint256 ve69LPFeeSell_,
        uint256 totalFeeSell_
    ) {
        return (
            buyJackpotFee,
            buyBurnFee,
            buyve69LPFee,
            totalFeeBuy,
            sellJackpotFee,
            sellBurnFee,
            sellve69LPFee,
            totalFeeSell
        );
    }
    
    /**
     * @dev Get detailed contract configuration for transparency
     * @return jackpotAddress_ Address receiving jackpot fees
     * @return ve69LPAddress_ Address receiving liquidity and development fees
     * @return burnAddress_ Address receiving burn fees
     * @return wrappedSonicAddress_ Address of wrapped Sonic token
     * @return lotteryAddress_ Address of lottery contract
     * @return exchangePair_ Address of exchange pair
     * @return tradingEnabled_ Whether trading is enabled
     * @return ownershipLocked_ Whether ownership is locked
     */
    function getContractConfiguration() external view returns (
        address jackpotAddress_,
        address ve69LPAddress_,
        address burnAddress_,
        address wrappedSonicAddress_,
        address lotteryAddress_,
        address exchangePair_,
        bool tradingEnabled_,
        bool ownershipLocked_
    ) {
        return (
            jackpotAddress,
            ve69LPAddress,
            burnAddress,
            wrappedSonicAddress,
            lotteryAddress,
            exchangePair,
            tradingEnabled,
            ownershipLocked
        );
    }
    
    /**
     * @dev Get transaction limits information
     * @return currentTxLimit Current maximum transaction amount
     * @return currentWalletLimit Current maximum wallet amount
     * @return specialTxRemaining Number of special transactions remaining
     * @return currentTxCount Current transaction count
     */
    function getLimitsInfo() external view returns (
        uint256 currentTxLimit,
        uint256 currentWalletLimit,
        uint256 specialTxRemaining,
        uint256 currentTxCount
    ) {
        return (
            getCurrentTransactionLimit(),
            getCurrentWalletLimit(),
            getRemainingSpecialTransactions(),
            transactionCount
        );
    }
    
    /**
     * @dev Track fee distributions for transparency
     * @param feeType The type of fee (1=jackpot, 2=liquidity, 3=burn, 4=development)
     * @param amount The amount of fee distributed
     */
    function _trackFeeDistribution(uint8 feeType, uint256 amount) private {
        if (feeType == 1) {
            totalJackpotFees += amount;
        } else if (feeType == 2) {
            totalve69LPFees += amount;
        } else if (feeType == 3) {
            totalBurned += amount;
        }
    }
    
    /**
     * @dev Get statistics about fee distributions
     * @return totalBurned_ Total tokens burned
     * @return totalJackpotFees_ Total tokens sent to jackpot
     * @return totalve69LPFees_ Total tokens sent to liquidity and development
     */
    function getFeeStats() external view returns (
        uint256 totalBurned_,
        uint256 totalJackpotFees_,
        uint256 totalve69LPFees_
    ) {
        return (
            totalBurned,
            totalJackpotFees,
            totalve69LPFees
        );
    }
    
    /**
     * @dev Record token holder for transparency
     * @param holder The address to track
     */
    function _recordHolder(address holder) private {
        if (holder != address(0) && holder != BURN_ADDRESS && holder != address(this)) {
            if (!_holders.contains(holder) && balanceOf(holder) > 0) {
                _holders.add(holder);
                totalHolders = _holders.length();
            } else if (_holders.contains(holder) && balanceOf(holder) == 0) {
                _holders.remove(holder);
                totalHolders = _holders.length();
            }
        }
    }
    
    /**
     * @dev Override _afterTokenTransfer to track holders
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        super._afterTokenTransfer(from, to, amount);
        
        // Track holders for transparency
        _recordHolder(from);
        _recordHolder(to);
        
        // Set launch timestamp on first transfer after trading enabled
        if (tradingEnabled && launchTimestamp == 0) {
            launchTimestamp = block.timestamp;
        }
    }
    
    /**
     * @dev Get holder at specific index (used for transparency dashboards)
     * @param index The index of the holder to retrieve
     * @return The address of the holder at the specified index
     */
    function getHolderAt(uint256 index) external view returns (address) {
        require(index < _holders.length(), "Index out of bounds");
        return _holders.at(index);
    }
    
    /**
     * @dev Get the total number of addresses holding the token
     * @return The number of unique holders
     */
    function getHolderCount() external view returns (uint256) {
        return _holders.length();
    }

    /**
     * @dev Sets the ve69LPAddress for the token
     * @param _ve69LPAddress New address for the ve69LPFeeDistributor
     */
    function setve69LPAddress(address _ve69LPAddress) external onlyOwner {
        require(_ve69LPAddress != address(0), "ve69LP address cannot be zero");
        ve69LPAddress = _ve69LPAddress;
        emit ve69LPAddressUpdated(_ve69LPAddress);
    }

    /**
     * @dev Schedule an update to the jackpot address
     * @param _newAddress The new jackpot address
     */
    function scheduleJackpotAddressUpdate(address _newAddress) external onlyOwner {
        require(_newAddress != address(0), "New address cannot be zero");
        bytes32 actionId = keccak256(abi.encodePacked("updateJackpotAddress", _newAddress));
        pendingActions[actionId] = block.timestamp + ADMIN_ACTION_DELAY;
        pendingActionDescriptions[actionId] = "Update jackpot address";
        emit ActionScheduled(actionId, "Update jackpot address", block.timestamp + ADMIN_ACTION_DELAY);
    }

    /**
     * @dev Execute a scheduled jackpot address update
     * @param _newAddress The new jackpot address
     */
    function executeJackpotAddressUpdate(address _newAddress) external onlyOwner {
        bytes32 actionId = keccak256(abi.encodePacked("updateJackpotAddress", _newAddress));
        require(pendingActions[actionId] > 0 && pendingActions[actionId] <= block.timestamp, "Action not ready or expired");
        jackpotAddress = _newAddress;
        delete pendingActions[actionId];
        emit ActionExecuted(actionId, "Update jackpot address");
    }

    /**
     * @dev Schedule an update to the ve69LP address
     * @param _newAddress The new ve69LP address
     */
    function scheduleve69LPAddressUpdate(address _newAddress) external onlyOwner {
        require(_newAddress != address(0), "New address cannot be zero");
        bytes32 actionId = keccak256(abi.encodePacked("updateve69LPAddress", _newAddress));
        pendingActions[actionId] = block.timestamp + ADMIN_ACTION_DELAY;
        pendingActionDescriptions[actionId] = "Update ve69LP address";
        emit ActionScheduled(actionId, "Update ve69LP address", block.timestamp + ADMIN_ACTION_DELAY);
    }

    /**
     * @dev Execute a scheduled ve69LP address update
     * @param _newAddress The new ve69LP address
     */
    function executeve69LPAddressUpdate(address _newAddress) external onlyOwner {
        bytes32 actionId = keccak256(abi.encodePacked("updateve69LPAddress", _newAddress));
        require(pendingActions[actionId] > 0 && pendingActions[actionId] <= block.timestamp, "Action not ready or expired");
        ve69LPAddress = _newAddress;
        delete pendingActions[actionId];
        emit ActionExecuted(actionId, "Update ve69LP address");
        emit ve69LPAddressUpdated(_newAddress);
    }

    /**
     * @dev Schedule a fee update
     * @param newJackpotFee New jackpot fee
     * @param newBurnFee New burn fee
     * @param newve69LPFee New ve69LP fee
     */
    function scheduleFeeUpdate(uint256 newJackpotFee, uint256 newBurnFee, uint256 newve69LPFee) external onlyOwner {
        uint256 totalNewFee = newJackpotFee + newBurnFee + newve69LPFee;
        require(totalNewFee <= 1000, "Total fee cannot exceed 10%");
        bytes32 actionId = keccak256(abi.encodePacked("updateFees", newJackpotFee, newBurnFee, newve69LPFee));
        pendingActions[actionId] = block.timestamp + FEE_UPDATE_DELAY;
        pendingActionDescriptions[actionId] = "Update fees";
        emit ActionScheduled(actionId, "Update fees", block.timestamp + FEE_UPDATE_DELAY);
    }

    /**
     * @dev Execute a scheduled fee update
     * @param newJackpotFee New jackpot fee
     * @param newBurnFee New burn fee
     * @param newve69LPFee New ve69LP fee
     */
    function executeFeeUpdate(uint256 newJackpotFee, uint256 newBurnFee, uint256 newve69LPFee) external onlyOwner {
        bytes32 actionId = keccak256(abi.encodePacked("updateFees", newJackpotFee, newBurnFee, newve69LPFee));
        require(pendingActions[actionId] > 0 && pendingActions[actionId] <= block.timestamp, "Action not ready or expired");
        jackpotFee = newJackpotFee;
        burnFee = newBurnFee;
        ve69LPFee = newve69LPFee;
        totalFee = newJackpotFee + newBurnFee + newve69LPFee;
        delete pendingActions[actionId];
        emit ActionExecuted(actionId, "Update fees");
    }

    /**
     * @dev Sets the router address for token swaps
     * @param _router The new router address
     */
    function setRouter(address _router) external onlyOwner {
        require(_router != address(0), "Router address cannot be zero");
        router = IUniswapV2Router(_router);
        emit RouterUpdated(_router);
    }

    /**
     * @dev Allows burning tokens
     * @param amount Amount of tokens to burn
     */
    function burn(uint256 amount) external {
        _burn(msg.sender, amount);
        totalBurned += amount;
        _trackFeeDistribution(3, amount);
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @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://diligence.consensys.net/posts/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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @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, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * 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.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @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`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/**
 * @dev Interface for DragonLotterySwap contract
 */
interface IDragonLotterySwap {
    /**
     * @dev Processes a buy and checks for lottery win
     * @param user Address of the user
     * @param wsAmount Amount of wS tokens involved
     */
    function processBuy(address user, uint256 wsAmount) external;
    
    /**
     * @dev Processes a sell transaction (potentially affecting global pity boost)
     * @param user Address of the user
     * @param wsAmount Amount of wS tokens involved
     */
    function processSell(address user, uint256 wsAmount) external;
    
    /**
     * @dev Increases the jackpot by depositing wS tokens
     * @param amount Amount of wS tokens to add to the jackpot
     */
    function addToJackpot(uint256 amount) external;
    
    /**
     * @dev Sets token's voting power in the lottery for boost calculation
     * @param user User address
     * @param votingPower Amount of voting power
     */
    function setUserVotingPower(address user, uint256 votingPower) external;
    
    /**
     * @dev Gets the current jackpot size
     * @return Current jackpot size in wS
     */
    function jackpot() external view returns (uint256);
    
    /**
     * @dev Gets the current total accumulated boost
     * @return Current accumulated boost percentage
     */
    function accumulatedWSBoost() external view returns (uint256);

    /**
     * @dev Process random words from VRF
     * @param requestId The request ID
     * @param randomWords The random values
     */
    function processRandomWords(uint256 requestId, uint256[] memory randomWords) external;
    
    /**
     * @dev Calculate win chance based on amount and user's voting power
     * @param user User address
     * @param wsAmount wSonic amount
     * @return winChance Win chance in basis points (e.g., 100 = 1%)
     */
    function calculateWinChance(address user, uint256 wsAmount) external view returns (uint256);
    
    /**
     * @dev Enter the lottery on behalf of a user
     * @param user User address to enter the lottery for
     * @param tickets Number of tickets to purchase
     */
    function enterLotteryFor(address user, uint256 tickets) external;
    
    function getCurrentJackpot() external view returns (uint256);
    function getStats() external view returns (uint256 winners, uint256 payouts, uint256 current);
    function getSwapLimits() external view returns (uint256 min, uint256 max, bool isUsdMode);
    function getJackpotTokenSymbol() external view returns (string memory);
    function isLotteryEnabled() external view returns (bool);

    function secureProcessBuy(address user, uint256 amount) external;
    function updateProbability(uint256 newProbability) external;
    function setExchangePair(address _exchangePair) external;
    function getLastWinner() external view returns (address);
    function getLastWinAmount() external view returns (uint256);
    function isVrfEnabled() external view returns (bool);
    function getVrfConfiguration() external view returns (
        address vrfCoordinator,
        bytes32 keyHash,
        uint64 subscriptionId
    );
    
    // Governance functions for USD mode
    function proposePriceOracle(address _priceOracle) external;
    function executePriceOracle(address _priceOracle) external;
    function proposeUseUsdEntryAmounts(bool _useUsdEntryAmounts) external;
    function executeUseUsdEntryAmounts(bool _useUsdEntryAmounts) external;
    
    // Flash loan protection
    function recordLpAcquisition(address user, uint256 amount) external;
    
    // Security checks
    function isSecureContext(address user) external view returns (bool);

    function toggleUsdMode() external;
    function setRouterUsdPriceMode(bool enable) external;
    function setJackpotWithdraw(bool enable) external;
    function setPriceUpdateGovernance(address governance) external;
    function distributeJackpot(address winner, uint256 amount) external;
    
    // Security/checks
    function isFlashLoanAttack(address from, address to) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

interface IUniswapV2Router {
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    
    function getAmountsOut(
        uint256 amountIn, 
        address[] calldata path
    ) external view returns (uint256[] memory amounts);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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