Contract Address Details

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

/**
 * @title StreamingRewardsV2 - Bulletproof Edition
 * @notice Auto-distributes streaming rewards with KEY boost mechanics
 * @dev Oracle pays all gas fees for seamless UX
 * 
 * HARDCODED POOLS (10 tokens):
 * - AER, KEY, SINEZ, EQ, WPLS, PHEX, PLSX, INC, PTGC, UFO
 * 
 * DEPLOYMENT: Only 3 parameters needed
 * - _keyToken: 0x644F10dF242b43F3de45FCb3f6Ef8526fb5fdF71
 * - _oracleSigner: Your Oracle wallet
 * - _noExpectationsAddress: Treasury for 3% tax
 * 
 * msg.sender automatically becomes admin - cannot fail!
 */
contract StreamingRewardsV3 is ReentrancyGuard, AccessControl, Pausable {
    using SafeERC20 for IERC20;
    using ECDSA for bytes32;

    // ============ ROLES ============
    bytes32 public constant ORACLE_ROLE = keccak256("ORACLE_ROLE");
    bytes32 public constant ADMIN_ROLE = keccak256("ADMIN_ROLE");
    bytes32 public constant EMERGENCY_ROLE = keccak256("EMERGENCY_ROLE");

    // ============ STATE VARIABLES ============
    
    IERC20 public immutable keyToken;
    address public oracleSigner;
    address public noExpectationsAddress;
    
    // BULLETPROOF: Deployment info
    address public immutable DEPLOYER;
    address public immutable CONFIRMED_ADMIN;
    uint256 public immutable DEPLOYMENT_BLOCK;
    uint256 public immutable DEPLOYMENT_TIME;
    
    // Security controls
    uint256 public constant MAX_TOKEN_POOLS = 50;
    uint256 public constant MAX_DISTRIBUTION_PER_ROUND = 1000000 * 10**18;
    uint256 public constant MAX_USERS_PER_DISTRIBUTION = 200;
    bool public emergencyPaused = false;
    
    // Scaling constants
    uint8 public constant CALCULATION_DECIMALS = 8;
    
    // Nonce tracking
    mapping(address => uint256) public userNonces;
    mapping(bytes32 => bool) public usedSignatures;

    struct TokenPool {
        uint256 balance;
        uint256 totalDeposited;
        uint256 totalDistributed;
        uint256 totalTaxPaid;
        uint256 lastDistributionAmount;
        uint256 distributionRate;
        uint256 minDistributionRate;
        uint256 maxDistributionRate;
        uint256 balanceWeight;
        uint256 demandScore;
        bool isActive;
        uint256 lastDistributionTime;
        uint8 decimals;
    }

    struct UserStats {
        uint256 totalReceived;
        uint256 lastReceiveTime;
        address preferredToken;
        uint256 keyBalanceSnapshot;
        uint256 totalStreamingTime;
        uint256 lastStreamingSession;
        uint256 consecutiveStreamDays;
        bool isActiveStreamer;
        uint256 lastNonceUsed;
    }

    struct DistributionRound {
        uint256 timestamp;
        uint256 totalDistributed;
        uint256 totalTaxPaid;
        uint256 participantCount;
        uint256 keySupplySnapshot;
        bool isUserTriggered;
        address triggeredBy;
        uint256 averageKeyBalance;
        uint256 totalStreamingTime;
    }

    struct DistributionSummary {
        uint256 totalUsers;
        uint256 totalRewards;
        uint256 totalTax;
        uint256 totalStreamingTime;
        uint256 totalKeyBalance;
    }

    // ============ MAPPINGS ============
    
    mapping(address => TokenPool) public tokenPools;
    mapping(address => bool) public supportedTokens;
    mapping(address => UserStats) public userStats;
    mapping(address => bool) public streamingStates;
    mapping(uint256 => DistributionRound) public distributionHistory;
    mapping(address => uint256) public userLastDistribution;
    mapping(address => mapping(address => uint256)) public userTokenPreference;
    
    address[] public tokenList;
    
    // ============ CONFIGURATION ============
    
    uint256 public noExpectationsTaxPercentage = 300; // 3%
    
    // KEY boost parameters
    uint256 public minKeyRequired = 145000000;         // 1.45 KEY (8 decimals)
    uint256 public maxBoostPercentage = 145;           // 145% max boost
    uint256 public boostDenominator = 145;
    uint256 public streamingTimeMultiplier = 100;
    uint256 public consecutiveDayBonus = 10;
    
    // Distribution parameters
    uint256 public constant DEFAULT_DISTRIBUTION_RATE = 500;   // 5%
    uint256 public constant ABSOLUTE_MIN_RATE = 100;           // 1%
    uint256 public constant ABSOLUTE_MAX_RATE = 2000;          // 20%
    uint256 public constant BALANCED_POOL_WEIGHT = 10000;
    
    // System status
    uint256 public currentRound;
    uint256 public lastGlobalDistribution;
    uint256 public totalActiveStreamers;
    uint256 public autoDistributionCount;
    bool public migrationEnabled = false;
    address public migrationTarget;
    mapping(address => bool) public tokensMigrated;

    // ============ EVENTS ============
    
    event RewardsAutoDistributed(
        address indexed user, 
        address indexed token, 
        uint256 amount, 
        uint256 taxAmount, 
        uint256 keyBalance, 
        uint256 keyBoost,
        uint256 streamingTime,
        uint256 poolWeight
    );
    
    event BalancedDistributionExecuted(
        uint256 round,
        uint256 totalUsers,
        uint256 totalRewards,
        uint256 averageKeyBalance,
        uint256 totalStreamingTime
    );
    
    event StreamingTimeAuthenticated(
        address indexed user,
        uint256 sessionTime,
        uint256 totalTime,
        bool consecutiveDay
    );
    
    event PoolRebalanced(
        address indexed token,
        uint256 oldWeight,
        uint256 newWeight,
        uint256 demandScore
    );

    event TokenPoolInitialized(
        address indexed token, 
        uint256 distributionRate, 
        uint256 minRate, 
        uint256 maxRate
    );

    event NoExpectationsDistribution(address indexed token, uint256 amount);
    event StreamingStateChanged(address indexed user, bool isStreaming);
    event TokenPoolReplenished(address indexed token, uint256 amount, uint256 newBalance);
    event PoolStatusChanged(address indexed token, bool isActive);
    event EmergencyPauseToggled(bool paused, address triggeredBy);
    event OracleChanged(address indexed oldOracle, address indexed newOracle);
    event SecurityAlert(string alertType, address indexed user, uint256 value);
    event AdminRolesGranted(address indexed admin, address indexed grantedBy);

    // ============ MODIFIERS ============
    
    modifier whenNotEmergencyPaused() {
        require(!emergencyPaused, "Emergency pause active");
        _;
    }
    
    modifier onlyOracle() {
        require(hasRole(ORACLE_ROLE, msg.sender), "Only oracle");
        _;
    }

    // ============ CONSTRUCTOR ============
    
    constructor(
        address _keyToken,
        address _oracleSigner,
        address _noExpectationsAddress
    ) {
        // BULLETPROOF VALIDATION
        require(msg.sender != address(0), "Impossible: msg.sender is zero");
        require(_keyToken != address(0), "Invalid KEY token");
        require(_keyToken.code.length > 0, "KEY token must be contract");
        require(_oracleSigner != address(0), "Invalid oracle signer");
        require(_noExpectationsAddress != address(0), "Invalid treasury address");
        
        keyToken = IERC20(_keyToken);
        oracleSigner = _oracleSigner;
        noExpectationsAddress = _noExpectationsAddress;
        
        // Store deployment info
        DEPLOYER = msg.sender;
        CONFIRMED_ADMIN = msg.sender;
        DEPLOYMENT_BLOCK = block.number;
        DEPLOYMENT_TIME = block.timestamp;
        
        // Grant ALL roles to msg.sender (guaranteed non-zero)
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(ADMIN_ROLE, msg.sender);
        _grantRole(EMERGENCY_ROLE, msg.sender);
        _grantRole(ORACLE_ROLE, _oracleSigner);
        
        emit AdminRolesGranted(msg.sender, msg.sender);
        
        // Verify roles were granted
        require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "FATAL: Admin role grant failed");
        require(hasRole(ADMIN_ROLE, msg.sender), "FATAL: Admin role grant failed");
        require(hasRole(EMERGENCY_ROLE, msg.sender), "FATAL: Emergency role grant failed");
        require(hasRole(ORACLE_ROLE, _oracleSigner), "FATAL: Oracle role grant failed");
        
        // Initialize 10 hardcoded pools
        _initializeHardcodedPools();
        
        lastGlobalDistribution = block.timestamp;
        
        // Verify pool count
        require(tokenList.length == 10, "Pool initialization failed");
    }

    // ============ HARDCODED POOLS (10 TOKENS) ============
    
    function _initializeHardcodedPools() internal {
        // AER - 8 decimals
        _addTokenPool(0x92337f43FB462163869342E72538744E030EAF55, 8);
        
        // KEY - 8 decimals  
        _addTokenPool(0x644F10dF242b43F3de45FCb3f6Ef8526fb5fdF71, 8);
        
        // SINEZ - 18 decimals
        _addTokenPool(0x9A28F76c18eE03E65EA6703AbAec77c1b99ddF31, 18);
        
        // EQ - 8 decimals
        _addTokenPool(0x584CA8ac0e6cc966775B429610Be0Caa4AE182f0, 8);
        
        // WPLS - 18 decimals
        _addTokenPool(0xA1077a294dDE1B09bB078844df40758a5D0f9a27, 18);
        
        // PHEX - 8 decimals
        _addTokenPool(0x2b591e99afE9f32eAA6214f7B7629768c40Eeb39, 8);
        
        // PLSX - 18 decimals
        _addTokenPool(0x95B303987A60C71504D99Aa1b13B4DA07b0790ab, 18);
        
        // INC - 18 decimals
        _addTokenPool(0x2fa878Ab3F87CC1C9737Fc071108F904c0B0C95d, 18);
        
        // PTGC - 18 decimals
        _addTokenPool(0x94534EeEe131840b1c0F61847c572228bdfDDE93, 18);
        
        // UFO - 18 decimals
        _addTokenPool(0x456548A9B56eFBbD89Ca0309edd17a9E20b04018, 18);
    }

    function _addTokenPool(address tokenAddress, uint8 decimals) internal {
        require(tokenAddress != address(0), "Invalid token address");
        require(!supportedTokens[tokenAddress], "Token already exists");
        require(tokenList.length < MAX_TOKEN_POOLS, "Too many token pools");

        tokenPools[tokenAddress] = TokenPool({
            balance: 0,
            totalDeposited: 0,
            totalDistributed: 0,
            totalTaxPaid: 0,
            lastDistributionAmount: 0,
            distributionRate: DEFAULT_DISTRIBUTION_RATE,
            minDistributionRate: ABSOLUTE_MIN_RATE,
            maxDistributionRate: ABSOLUTE_MAX_RATE,
            balanceWeight: BALANCED_POOL_WEIGHT,
            demandScore: 0,
            isActive: false,
            lastDistributionTime: block.timestamp,
            decimals: decimals
        });

        supportedTokens[tokenAddress] = true;
        tokenList.push(tokenAddress);

        emit TokenPoolInitialized(tokenAddress, DEFAULT_DISTRIBUTION_RATE, ABSOLUTE_MIN_RATE, ABSOLUTE_MAX_RATE);
    }

    // ============ DEPLOYMENT VERIFICATION ============
    
    function verifyDeployment() external view returns (
        address deployerAddress,
        bool deployerIsAdmin,
        bool oracleIsSet,
        uint256 poolCount,
        uint256 blockNumber
    ) {
        deployerAddress = DEPLOYER;
        deployerIsAdmin = hasRole(DEFAULT_ADMIN_ROLE, DEPLOYER) && 
                          hasRole(ADMIN_ROLE, DEPLOYER) && 
                          hasRole(EMERGENCY_ROLE, DEPLOYER);
        oracleIsSet = hasRole(ORACLE_ROLE, oracleSigner);
        poolCount = tokenList.length;
        blockNumber = DEPLOYMENT_BLOCK;
    }
    
    function getDeploymentInfo() external view returns (
        address deployer,
        address confirmedAdmin,
        address oracle,
        address treasury,
        uint256 deployedAtBlock,
        uint256 deployedAtTime,
        uint256 pools
    ) {
        return (
            DEPLOYER,
            CONFIRMED_ADMIN,
            oracleSigner,
            noExpectationsAddress,
            DEPLOYMENT_BLOCK,
            DEPLOYMENT_TIME,
            tokenList.length
        );
    }
    
    function isAdmin(address account) external view returns (bool) {
        return hasRole(ADMIN_ROLE, account) || hasRole(DEFAULT_ADMIN_ROLE, account);
    }
    
    function getGuaranteedAdmin() external view returns (address) {
        return DEPLOYER;
    }

    // ============ SCALING FUNCTIONS ============

    function _scaleForCalculation(uint256 amount, uint8 decimals) internal pure returns (uint256) {
        if (decimals <= CALCULATION_DECIMALS) {
            return amount;
        }
        uint8 scaleFactor = decimals - CALCULATION_DECIMALS;
        return amount / (10 ** uint256(scaleFactor));
    }

    function _scaleBackForTransfer(uint256 scaledAmount, uint8 decimals) internal pure returns (uint256) {
        if (decimals <= CALCULATION_DECIMALS) {
            return scaledAmount;
        }
        uint8 scaleFactor = decimals - CALCULATION_DECIMALS;
        return scaledAmount * (10 ** uint256(scaleFactor));
    }

    // ============ AUTO DISTRIBUTION ============

    function autoDistributeRewardsBalanced(
        address[] calldata users,
        uint256[] calldata streamingTimes,
        address[] calldata preferredTokens,
        uint256[] calldata nonces,
        bytes calldata signature
    ) external nonReentrant onlyOracle whenNotPaused whenNotEmergencyPaused {
        require(!migrationEnabled, "Auto-distribution disabled during migration");
        _validateDistributionInput(users, streamingTimes, preferredTokens, nonces);
        
        _verifyDistributionSignature(users, streamingTimes, preferredTokens, nonces, signature);
        _verifyAndUpdateNonces(users, nonces);
        
        uint256 totalDistributionValue = _preDistributionValidation(users, streamingTimes, preferredTokens);
        
        _autoSyncBeforeDistribution();
        _updatePoolWeights();
        _executeBalancedDistribution(users, streamingTimes, preferredTokens, totalDistributionValue);
    }

    function _validateDistributionInput(
        address[] calldata users,
        uint256[] calldata streamingTimes,
        address[] calldata preferredTokens,
        uint256[] calldata nonces
    ) internal pure {
        require(users.length == streamingTimes.length, "Array length mismatch");
        require(streamingTimes.length == preferredTokens.length, "Array length mismatch");  
        require(preferredTokens.length == nonces.length, "Array length mismatch");
        require(users.length <= MAX_USERS_PER_DISTRIBUTION, "Batch too large");
    }

    function _verifyDistributionSignature(
        address[] calldata users,
        uint256[] calldata streamingTimes,
        address[] calldata preferredTokens,
        uint256[] calldata nonces,
        bytes calldata signature
    ) internal {
        bytes32 messageHash = keccak256(abi.encode(
            users, 
            streamingTimes, 
            preferredTokens, 
            nonces, 
            block.timestamp / 300
        ));
        
        require(!usedSignatures[messageHash], "Signature already used");
        usedSignatures[messageHash] = true;
        
        bytes32 ethSignedHash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", messageHash));
        require(ethSignedHash.recover(signature) == oracleSigner, "Invalid signature");
    }

    function _verifyAndUpdateNonces(
        address[] calldata users,
        uint256[] calldata nonces
    ) internal {
        for (uint i = 0; i < users.length; i++) {
            require(nonces[i] == userNonces[users[i]] + 1, "Invalid nonce");
            userNonces[users[i]] = nonces[i];
            userStats[users[i]].lastNonceUsed = nonces[i];
        }
    }

    function _preDistributionValidation(
        address[] calldata users,
        uint256[] calldata streamingTimes,
        address[] calldata preferredTokens
    ) internal view returns (uint256 totalValue) {
        uint256 totalNetworkWeight = _calculateTotalNetworkWeight(users, streamingTimes);
        require(totalNetworkWeight > 0, "No eligible users");
        
        for (uint i = 0; i < users.length; i++) {
            if (streamingTimes[i] > 0) {
                (uint256 reward,) = _calculateBalancedReward(
                    users[i], 
                    streamingTimes[i], 
                    preferredTokens[i], 
                    totalNetworkWeight
                );
                totalValue = totalValue + reward;
            }
        }
        
        require(totalValue <= MAX_DISTRIBUTION_PER_ROUND, "Distribution exceeds safety limit");
    }

    function _executeBalancedDistribution(
        address[] calldata users,
        uint256[] calldata streamingTimes,
        address[] calldata preferredTokens,
        uint256 totalDistributionValue
    ) internal {
        require(users.length <= MAX_USERS_PER_DISTRIBUTION, "Too many users");
        require(totalDistributionValue <= MAX_DISTRIBUTION_PER_ROUND, "Distribution too large");
        
        uint256 totalNetworkWeight = _calculateTotalNetworkWeight(users, streamingTimes);
        DistributionSummary memory summary;
        
        for (uint i = 0; i < users.length; i++) {
            _processUserDistribution(
                users[i],
                streamingTimes[i], 
                preferredTokens[i],
                totalNetworkWeight,
                summary
            );
        }
        
        _finalizeBalancedDistribution(
            summary.totalUsers, 
            summary.totalRewards, 
            summary.totalTax, 
            summary.totalStreamingTime, 
            summary.totalKeyBalance
        );
    }

    function _processUserDistribution(
        address user,
        uint256 streamingTime,
        address preferredToken,
        uint256 totalNetworkWeight,
        DistributionSummary memory summary
    ) internal {
        if (streamingTime == 0) return;
        
        _authenticateStreamingTime(user, streamingTime);
        
        (uint256 reward, uint256 tax) = _calculateBalancedReward(
            user, 
            streamingTime, 
            preferredToken, 
            totalNetworkWeight
        );
        
        if (reward > 0) {
            require(tokenPools[preferredToken].balance >= reward + tax, "Insufficient pool balance");
            
            _distributeReward(user, preferredToken, reward, tax);
            
            summary.totalUsers = summary.totalUsers + 1;
            summary.totalRewards = summary.totalRewards + reward;
            summary.totalTax = summary.totalTax + tax;
            summary.totalStreamingTime = summary.totalStreamingTime + streamingTime;
            summary.totalKeyBalance = summary.totalKeyBalance + userStats[user].keyBalanceSnapshot;
            
            emit RewardsAutoDistributed(
                user, 
                preferredToken, 
                reward, 
                tax, 
                userStats[user].keyBalanceSnapshot,
                _getKeyBoostPercentage(user),
                streamingTime,
                tokenPools[preferredToken].balanceWeight
            );
        }
    }

    function _calculateBalancedReward(
        address user,
        uint256 streamingTime,
        address preferredToken,
        uint256 totalNetworkWeight
    ) internal view returns (uint256 reward, uint256 tax) {
        (, uint256 userKeyBalance, bool hasEnoughKey) = calculateKeyBoost(user);
        if (!hasEnoughKey) return (0, 0);
        
        if (!tokenPools[preferredToken].isActive || tokenPools[preferredToken].balance == 0) {
            return (0, 0);
        }
        
        uint256 userWeight = _calculateUserWeightSafe(user, streamingTime, userKeyBalance);
        return _calculateRewardFromWeight(preferredToken, userWeight, totalNetworkWeight);
    }

    function _calculateRewardFromWeight(
        address preferredToken,
        uint256 userWeight,
        uint256 totalNetworkWeight
    ) internal view returns (uint256 reward, uint256 tax) {
        TokenPool memory pool = tokenPools[preferredToken];
        
        uint256 poolDistribution = (pool.balance * pool.distributionRate) / 10000;
        uint256 scaledDistribution = _scaleForCalculation(poolDistribution, pool.decimals);
        uint256 scaledWeightedDistribution = (scaledDistribution * pool.balanceWeight) / BALANCED_POOL_WEIGHT;
        
        if (totalNetworkWeight > 0) {
            uint256 scaledReward = (scaledWeightedDistribution * userWeight) / totalNetworkWeight;
            reward = _scaleBackForTransfer(scaledReward, pool.decimals);
            tax = (reward * noExpectationsTaxPercentage) / 10000;
            
            uint256 totalCost = reward + tax;
            if (totalCost > pool.balance) {
                uint256 adjustmentFactor = (pool.balance * 10000) / totalCost;
                reward = (reward * adjustmentFactor) / 10000;
                tax = (tax * adjustmentFactor) / 10000;
            }
        }
    }

    function _calculateUserWeightSafe(
        address user,
        uint256 streamingTime,
        uint256 keyBalance
    ) internal view returns (uint256) {
        require(streamingTime <= type(uint256).max / streamingTimeMultiplier, "Streaming time overflow");
        uint256 baseWeight = streamingTime * streamingTimeMultiplier;
        
        uint256 keySupply = keyToken.totalSupply();
        uint256 keyWeight = 0;
        if (keyBalance > 0 && keySupply > 0) {
            uint256 keyPercentage = (keyBalance * 10000) / keySupply;
            keyWeight = _sqrt(keyPercentage * 1000);
        }
        
        uint256 boostPercentage = _getKeyBoostPercentage(user);
        uint256 boostMultiplier = 10000 + (boostPercentage * 100);
        
        uint256 consecutiveBonus = userStats[user].consecutiveStreamDays * consecutiveDayBonus;
        consecutiveBonus = consecutiveBonus > 50 ? 50 : consecutiveBonus;
        
        uint256 totalWeight = baseWeight + keyWeight;
        
        require(totalWeight <= type(uint256).max / boostMultiplier, "Weight calculation overflow");
        totalWeight = (totalWeight * boostMultiplier) / 10000;
        
        uint256 consecutiveMultiplier = 10000 + (consecutiveBonus * 100);
        require(totalWeight <= type(uint256).max / consecutiveMultiplier, "Consecutive bonus overflow");
        totalWeight = (totalWeight * consecutiveMultiplier) / 10000;
        
        return totalWeight;
    }

    function _calculateTotalNetworkWeight(
        address[] calldata users,
        uint256[] calldata streamingTimes
    ) internal view returns (uint256 totalWeight) {
        for (uint i = 0; i < users.length; i++) {
            if (streamingTimes[i] > 0) {
                uint256 keyBalance = keyToken.balanceOf(users[i]);
                uint256 userWeight = _calculateUserWeightSafe(users[i], streamingTimes[i], keyBalance);
                totalWeight = totalWeight + userWeight;
            }
        }
    }

    function _authenticateStreamingTime(address user, uint256 sessionTime) internal {
        UserStats storage stats = userStats[user];
        
        require(stats.totalStreamingTime <= type(uint256).max - sessionTime, "Total streaming time overflow");
        stats.totalStreamingTime = stats.totalStreamingTime + sessionTime;
        stats.lastStreamingSession = block.timestamp;
        stats.keyBalanceSnapshot = keyToken.balanceOf(user);
        
        bool consecutiveDay = false;
        if (stats.lastReceiveTime > 0) {
            uint256 daysSinceLastReward = (block.timestamp - stats.lastReceiveTime) / 86400;
            if (daysSinceLastReward == 1) {
                stats.consecutiveStreamDays = stats.consecutiveStreamDays >= 5 ? 5 : stats.consecutiveStreamDays + 1;
                consecutiveDay = true;
            } else if (daysSinceLastReward > 1) {
                stats.consecutiveStreamDays = 1;
            }
        } else {
            stats.consecutiveStreamDays = 1;
        }
        
        emit StreamingTimeAuthenticated(user, sessionTime, stats.totalStreamingTime, consecutiveDay);
    }

    function _updatePoolWeights() internal {
        for (uint i = 0; i < tokenList.length && i < MAX_TOKEN_POOLS; i++) {
            address token = tokenList[i];
            TokenPool storage pool = tokenPools[token];
            
            if (!pool.isActive) continue;
            
            uint256 timeSinceLastDistribution = block.timestamp - pool.lastDistributionTime;
            uint256 demandDecay = timeSinceLastDistribution > 86400 ? 86400 : timeSinceLastDistribution;
            pool.demandScore = pool.demandScore > demandDecay ? pool.demandScore - demandDecay : 0;
            
            uint256 oldWeight = pool.balanceWeight;
            uint256 balanceFactor = pool.balance > 0 ? (pool.balance * 1000) / (pool.balance + pool.totalDistributed) : 0;
            uint256 demandFactor = pool.demandScore > 1000 ? 1000 : pool.demandScore;
            
            pool.balanceWeight = BALANCED_POOL_WEIGHT + balanceFactor + demandFactor;
            
            if (oldWeight != pool.balanceWeight) {
                emit PoolRebalanced(token, oldWeight, pool.balanceWeight, pool.demandScore);
            }
        }
    }

    function _distributeReward(
        address user,
        address token,
        uint256 amount,
        uint256 tax
    ) internal {
        TokenPool storage pool = tokenPools[token];
        uint256 totalCost = amount + tax;
        
        require(pool.balance >= totalCost, "Insufficient pool balance");
        
        pool.balance = pool.balance - totalCost;
        pool.totalDistributed = pool.totalDistributed + amount;
        pool.totalTaxPaid = pool.totalTaxPaid + tax;
        pool.lastDistributionAmount = amount;
        pool.lastDistributionTime = block.timestamp;
        pool.demandScore = pool.demandScore + 100;
        
        UserStats storage stats = userStats[user];
        stats.totalReceived = stats.totalReceived + amount;
        stats.lastReceiveTime = block.timestamp;
        stats.preferredToken = token;
        
        IERC20(token).safeTransfer(user, amount);
        if (tax > 0) {
            IERC20(token).safeTransfer(noExpectationsAddress, tax);
            emit NoExpectationsDistribution(token, tax);
        }
        
        userTokenPreference[user][token] = userTokenPreference[user][token] + 10;
    }

    function _finalizeBalancedDistribution(
        uint256 totalUsers,
        uint256 totalRewards,
        uint256 totalTax,
        uint256 totalStreamingTime,
        uint256 totalKeyBalance
    ) internal {
        currentRound = currentRound + 1;
        DistributionRound storage round = distributionHistory[currentRound];
        
        round.timestamp = block.timestamp;
        round.totalDistributed = totalRewards;
        round.totalTaxPaid = totalTax;
        round.participantCount = totalUsers;
        round.keySupplySnapshot = keyToken.totalSupply();
        round.isUserTriggered = false;
        round.triggeredBy = oracleSigner;
        round.averageKeyBalance = totalUsers > 0 ? totalKeyBalance / totalUsers : 0;
        round.totalStreamingTime = totalStreamingTime;
        
        lastGlobalDistribution = block.timestamp;
        autoDistributionCount = autoDistributionCount + 1;
        
        emit BalancedDistributionExecuted(
            currentRound,
            totalUsers,
            totalRewards,
            round.averageKeyBalance,
            totalStreamingTime
        );
    }

    // ============ POOL MANAGEMENT ============

    function fundPool(address token, uint256 amount) external nonReentrant whenNotPaused {
        require(supportedTokens[token], "Token not supported");
        require(amount > 0, "Amount must be greater than 0");
        
        IERC20(token).safeTransferFrom(msg.sender, address(this), amount);
        
        TokenPool storage pool = tokenPools[token];
        pool.balance = pool.balance + amount;
        pool.totalDeposited = pool.totalDeposited + amount;
        
        if (!pool.isActive) {
            pool.isActive = true;
            emit PoolStatusChanged(token, true);
        }
        
        emit TokenPoolReplenished(token, amount, pool.balance);
    }

    function getDistributionAmount(address token) public view returns (uint256) {
        TokenPool memory pool = tokenPools[token];
        if (!pool.isActive || pool.balance == 0) return 0;
        return (pool.balance * pool.distributionRate) / 10000;
    }

    function _autoSyncBeforeDistribution() internal {
        for (uint i = 0; i < tokenList.length && i < MAX_TOKEN_POOLS; i++) {
            address token = tokenList[i];
            
            if (!migrationEnabled || !tokensMigrated[token]) {
                uint256 actualBalance = IERC20(token).balanceOf(address(this));
                uint256 expectedBalance = tokenPools[token].balance;
                
                if (actualBalance > expectedBalance) {
                    uint256 increase = actualBalance - expectedBalance;
                    
                    TokenPool storage pool = tokenPools[token];
                    pool.balance = actualBalance;
                    pool.totalDeposited = pool.totalDeposited + increase;
                    
                    if (!pool.isActive) {
                        pool.isActive = true;
                        emit PoolStatusChanged(token, true);
                    }
                    
                    emit TokenPoolReplenished(token, increase, pool.balance);
                }
            }
        }
    }

    // ============ KEY BOOST ============

    function calculateKeyBoost(address user) public view returns (uint256, uint256, bool) {
        uint256 userKeyBalance = keyToken.balanceOf(user);
        uint256 totalSupply = keyToken.totalSupply();
        
        if (userKeyBalance < minKeyRequired || totalSupply == 0) {
            return (0, userKeyBalance, false);
        }
        
        uint256 supplyPercentage = (userKeyBalance * 10000) / totalSupply;
        uint256 boostPercentage = 100;
        
        if (supplyPercentage >= boostDenominator) {
            boostPercentage = maxBoostPercentage;
        } else {
            uint256 boostRange = maxBoostPercentage - 100;
            boostPercentage = 100 + ((boostRange * supplyPercentage) / boostDenominator);
        }
        
        return (boostPercentage, userKeyBalance, true);
    }

    function _getKeyBoostPercentage(address user) internal view returns (uint256) {
        (uint256 boostPercentage, , bool hasEnoughKey) = calculateKeyBoost(user);
        return hasEnoughKey ? boostPercentage : 100;
    }

    function _sqrt(uint256 x) internal pure returns (uint256) {
        if (x == 0) return 0;
        uint256 z = (x + 1) / 2;
        uint256 y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
        return y;
    }

    // ============ VIEW FUNCTIONS ============

    function getUserRewardEstimate(address user, uint256 streamingTime) external view returns (
        uint256 estimatedReward,
        address recommendedToken,
        uint256 userWeight,
        uint256 boostPercentage
    ) {
        uint256 keyBalance = keyToken.balanceOf(user);
        userWeight = _calculateUserWeightSafe(user, streamingTime, keyBalance);
        boostPercentage = _getKeyBoostPercentage(user);
        
        recommendedToken = _getBestTokenForUser(user);
        
        if (tokenPools[recommendedToken].isActive && tokenPools[recommendedToken].balance > 0) {
            uint256 poolDistribution = getDistributionAmount(recommendedToken);
            estimatedReward = (poolDistribution * userWeight) / (userWeight + 1000000);
        }
    }

    function _getBestTokenForUser(address user) internal view returns (address bestToken) {
        uint256 bestScore = 0;
        bestToken = tokenList.length > 0 ? tokenList[0] : address(0);
        
        for (uint i = 0; i < tokenList.length && i < MAX_TOKEN_POOLS; i++) {
            address token = tokenList[i];
            if (!tokenPools[token].isActive) continue;
            
            uint256 score = userTokenPreference[user][token] + tokenPools[token].balanceWeight;
            if (score > bestScore) {
                bestScore = score;
                bestToken = token;
            }
        }
    }

    function getSystemStatus() external view returns (
        uint256 totalPools,
        uint256 activePools,
        uint256 totalRewardsDistributed,
        uint256 currentRoundNumber,
        uint256 lastDistributionTime,
        uint256 totalStreamers
    ) {
        totalPools = tokenList.length;
        currentRoundNumber = currentRound;
        lastDistributionTime = lastGlobalDistribution;
        totalStreamers = totalActiveStreamers;
        
        for (uint i = 0; i < tokenList.length && i < MAX_TOKEN_POOLS; i++) {
            if (tokenPools[tokenList[i]].isActive) {
                activePools = activePools + 1;
            }
            totalRewardsDistributed = totalRewardsDistributed + tokenPools[tokenList[i]].totalDistributed;
        }
    }

    function getPoolInfo(address token) external view returns (
        uint256 balance,
        uint256 totalDeposited,
        uint256 totalDistributed,
        uint256 distributionRate,
        bool isActive,
        uint256 nextDistribution,
        uint8 decimals
    ) {
        TokenPool memory pool = tokenPools[token];
        return (
            pool.balance,
            pool.totalDeposited,
            pool.totalDistributed,
            pool.distributionRate,
            pool.isActive,
            getDistributionAmount(token),
            pool.decimals
        );
    }

    function getUserStats(address user) external view returns (
        uint256 totalReceived,
        uint256 lastReceiveTime,
        address preferredToken,
        uint256 totalStreamingTime,
        uint256 consecutiveStreamDays,
        uint256 currentNonce
    ) {
        UserStats memory stats = userStats[user];
        return (
            stats.totalReceived,
            stats.lastReceiveTime,
            stats.preferredToken,
            stats.totalStreamingTime,
            stats.consecutiveStreamDays,
            userNonces[user]
        );
    }

    function getAllSupportedTokens() external view returns (address[] memory) {
        return tokenList;
    }

    function getTokenPoolCount() external view returns (uint256) {
        return tokenList.length;
    }

    function isTokenSupported(address tokenAddress) external view returns (bool) {
        return supportedTokens[tokenAddress];
    }

    // ============ ADMIN POOL MANAGEMENT ============

    function addNewTokenPool(
        address tokenAddress,
        uint8 decimals,
        uint256 distributionRate
    ) external onlyRole(ADMIN_ROLE) {
        require(tokenAddress != address(0), "Invalid token address");
        require(!supportedTokens[tokenAddress], "Token already exists");
        require(tokenList.length < MAX_TOKEN_POOLS, "Too many token pools");
        require(distributionRate >= ABSOLUTE_MIN_RATE && distributionRate <= ABSOLUTE_MAX_RATE, "Invalid rate");

        tokenPools[tokenAddress] = TokenPool({
            balance: 0,
            totalDeposited: 0,
            totalDistributed: 0,
            totalTaxPaid: 0,
            lastDistributionAmount: 0,
            distributionRate: distributionRate,
            minDistributionRate: ABSOLUTE_MIN_RATE,
            maxDistributionRate: ABSOLUTE_MAX_RATE,
            balanceWeight: BALANCED_POOL_WEIGHT,
            demandScore: 0,
            isActive: false,
            lastDistributionTime: block.timestamp,
            decimals: decimals
        });

        supportedTokens[tokenAddress] = true;
        tokenList.push(tokenAddress);

        emit TokenPoolInitialized(tokenAddress, distributionRate, ABSOLUTE_MIN_RATE, ABSOLUTE_MAX_RATE);
    }

    function removeTokenPool(address tokenAddress) external onlyRole(ADMIN_ROLE) {
        require(supportedTokens[tokenAddress], "Token not found");
        require(tokenPools[tokenAddress].balance == 0, "Pool must be empty");

        supportedTokens[tokenAddress] = false;
        
        for (uint i = 0; i < tokenList.length; i++) {
            if (tokenList[i] == tokenAddress) {
                tokenList[i] = tokenList[tokenList.length - 1];
                tokenList.pop();
                break;
            }
        }

        delete tokenPools[tokenAddress];
        emit PoolStatusChanged(tokenAddress, false);
    }

    function updatePoolDistributionRate(
        address tokenAddress,
        uint256 newRate
    ) external onlyRole(ADMIN_ROLE) {
        require(supportedTokens[tokenAddress], "Token not found");
        require(newRate >= ABSOLUTE_MIN_RATE && newRate <= ABSOLUTE_MAX_RATE, "Invalid rate");
        tokenPools[tokenAddress].distributionRate = newRate;
        emit TokenPoolInitialized(tokenAddress, newRate, ABSOLUTE_MIN_RATE, ABSOLUTE_MAX_RATE);
    }

    function syncAllPoolBalances() external onlyRole(ADMIN_ROLE) {
        for (uint i = 0; i < tokenList.length; i++) {
            _syncPoolBalance(tokenList[i]);
        }
    }

    function _syncPoolBalance(address tokenAddress) internal {
        if (!supportedTokens[tokenAddress]) return;
        
        uint256 actualBalance = IERC20(tokenAddress).balanceOf(address(this));
        uint256 trackedBalance = tokenPools[tokenAddress].balance;
        
        if (actualBalance > trackedBalance) {
            uint256 newDeposits = actualBalance - trackedBalance;
            
            TokenPool storage pool = tokenPools[tokenAddress];
            pool.balance = actualBalance;
            pool.totalDeposited = pool.totalDeposited + newDeposits;
            
            if (!pool.isActive) {
                pool.isActive = true;
                emit PoolStatusChanged(tokenAddress, true);
            }
            
            emit TokenPoolReplenished(tokenAddress, newDeposits, pool.balance);
        }
    }

    // ============ ADMIN FUNCTIONS ============

    function setNoExpectationsTaxPercentage(uint256 _taxPercentage) external onlyRole(ADMIN_ROLE) {
        require(_taxPercentage <= 1000, "Tax cannot exceed 10%");
        noExpectationsTaxPercentage = _taxPercentage;
    }

    function setStreamingState(address user, bool isStreaming) external onlyOracle {
        streamingStates[user] = isStreaming;
        userStats[user].isActiveStreamer = isStreaming;
        emit StreamingStateChanged(user, isStreaming);
    }

    function updateKeyParameters(
        uint256 _minKeyRequired,
        uint256 _maxBoostPercentage,
        uint256 _boostDenominator
    ) external onlyRole(ADMIN_ROLE) {
        require(_maxBoostPercentage >= 100 && _maxBoostPercentage <= 500, "Invalid boost percentage");
        require(_boostDenominator > 0 && _boostDenominator <= 1000, "Invalid boost denominator");
        
        minKeyRequired = _minKeyRequired;
        maxBoostPercentage = _maxBoostPercentage;
        boostDenominator = _boostDenominator;
    }
    
    function setOracleSigner(address newOracle) external onlyRole(ADMIN_ROLE) {
        require(newOracle != address(0), "Invalid oracle address");
        
        address oldOracle = oracleSigner;
        _revokeRole(ORACLE_ROLE, oldOracle);
        _grantRole(ORACLE_ROLE, newOracle);
        oracleSigner = newOracle;
        
        emit OracleChanged(oldOracle, newOracle);
    }
    
    function setNoExpectationsAddress(address newTreasury) external onlyRole(ADMIN_ROLE) {
        require(newTreasury != address(0), "Invalid treasury address");
        noExpectationsAddress = newTreasury;
    }

    // ============ SECURITY FUNCTIONS ============

    function emergencyPause() external onlyRole(EMERGENCY_ROLE) {
        emergencyPaused = true;
        emit EmergencyPauseToggled(true, msg.sender);
        emit SecurityAlert("EMERGENCY_PAUSE", msg.sender, block.timestamp);
    }

    function emergencyUnpause() external onlyRole(ADMIN_ROLE) {
        emergencyPaused = false;
        emit EmergencyPauseToggled(false, msg.sender);
    }

    function pause() external onlyRole(ADMIN_ROLE) {
        _pause();
    }

    function unpause() external onlyRole(ADMIN_ROLE) {
        _unpause();
    }

    // ============ EMERGENCY FUNCTIONS ============

    function emergencyWithdraw(address token, uint256 amount) external onlyRole(EMERGENCY_ROLE) {
        require(emergencyPaused, "Emergency not active");
        IERC20(token).safeTransfer(msg.sender, amount);
        
        if (supportedTokens[token]) {
            TokenPool storage pool = tokenPools[token];
            pool.balance = pool.balance >= amount ? pool.balance - amount : 0;
        }
        
        emit SecurityAlert("EMERGENCY_WITHDRAWAL", msg.sender, amount);
    }

    function emergencyDisablePool(address token) external onlyRole(EMERGENCY_ROLE) {
        tokenPools[token].isActive = false;
        emit PoolStatusChanged(token, false);
        emit SecurityAlert("POOL_EMERGENCY_DISABLED", token, 0);
    }

    function emergencyResetUserNonce(address user, uint256 newNonce) external onlyRole(EMERGENCY_ROLE) {
        require(emergencyPaused, "Emergency not active");
        userNonces[user] = newNonce;
        emit SecurityAlert("NONCE_RESET", user, newNonce);
    }

    // ============ MIGRATION FUNCTIONS ============

    function enableMigration(address _migrationTarget) external onlyRole(ADMIN_ROLE) {
        require(_migrationTarget != address(0), "Invalid address");
        migrationEnabled = true;
        migrationTarget = _migrationTarget;
        emit SecurityAlert("MIGRATION_ENABLED", _migrationTarget, 0);
    }

    function disableMigration() external onlyRole(ADMIN_ROLE) {
        migrationEnabled = false;
        migrationTarget = address(0);
        emit SecurityAlert("MIGRATION_DISABLED", address(0), 0);
    }

    function migrateTokens(address[] calldata tokens) external onlyRole(ADMIN_ROLE) {
        require(migrationEnabled, "Migration not enabled");
        require(migrationTarget != address(0), "Migration target not set");
        
        for (uint i = 0; i < tokens.length; i++) {
            address token = tokens[i];
            if (!tokensMigrated[token]) {
                uint256 balance = IERC20(token).balanceOf(address(this));
                if (balance > 0) {
                    IERC20(token).safeTransfer(migrationTarget, balance);
                    tokensMigrated[token] = true;
                    
                    if (supportedTokens[token]) {
                        tokenPools[token].balance = 0;
                    }
                    
                    emit SecurityAlert("TOKEN_MIGRATED", token, balance);
                }
            }
        }
    }
}
        

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

pragma solidity >=0.4.16;

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

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

pragma solidity >=0.4.16;

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

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

pragma solidity >=0.4.16;

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

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

pragma solidity ^0.8.20;

import {IAccessControl} from "./IAccessControl.sol";
import {Context} from "../utils/Context.sol";
import {IERC165, ERC165} from "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    mapping(bytes32 role => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /// @inheritdoc IERC165
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        return _roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        if (!hasRole(role, account)) {
            _roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` from `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        if (hasRole(role, account)) {
            _roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}
          

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

pragma solidity ^0.8.20;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS
    }

    /**
     * @dev The signature derives the `address(0)`.
     */
    error ECDSAInvalidSignature();

    /**
     * @dev The signature has an invalid length.
     */
    error ECDSAInvalidSignatureLength(uint256 length);

    /**
     * @dev The signature has an S value that is in the upper half order.
     */
    error ECDSAInvalidSignatureS(bytes32 s);

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
     * return address(0) without also returning an error description. Errors are documented using an enum (error type)
     * and a bytes32 providing additional information about the error.
     *
     * If no error is returned, then the address can be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function tryRecover(
        bytes32 hash,
        bytes memory signature
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly ("memory-safe") {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[ERC-2098 short signatures]
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        unchecked {
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            return tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS, s);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature, bytes32(0));
        }

        return (signer, RecoverError.NoError, bytes32(0));
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
     */
    function _throwError(RecoverError error, bytes32 errorArg) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert ECDSAInvalidSignature();
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert ECDSAInvalidSignatureLength(uint256(errorArg));
        } else if (error == RecoverError.InvalidSignatureS) {
            revert ECDSAInvalidSignatureS(errorArg);
        }
    }
}
          

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

pragma solidity >=0.8.4;

/**
 * @dev External interface of AccessControl declared to support ERC-165 detection.
 */
interface IAccessControl {
    /**
     * @dev The `account` is missing a role.
     */
    error AccessControlUnauthorizedAccount(address account, bytes32 neededRole);

    /**
     * @dev The caller of a function is not the expected one.
     *
     * NOTE: Don't confuse with {AccessControlUnauthorizedAccount}.
     */
    error AccessControlBadConfirmation();

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted to signal this.
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call. This account bears the admin role (for the granted role).
     * Expected in cases where the role was granted using the internal {AccessControl-_grantRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     */
    function renounceRole(bytes32 role, address callerConfirmation) external;
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165 is IERC165 {
    /// @inheritdoc IERC165
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
          

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

pragma solidity ^0.8.20;

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

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

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

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

pragma solidity >=0.6.2;

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

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

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

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

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

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

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

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

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

pragma solidity >=0.4.16;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.20;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}
          

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

pragma solidity ^0.8.0;

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

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

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

    bool private _paused;

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

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

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

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

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

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

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

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