VANcoinStaking

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

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

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

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

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

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

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// 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);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// 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;
    }
}
"
    },
    "@openzeppelin/contracts/utils/Pausable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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 {
    bool private _paused;

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @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 {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @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());
    }
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

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

    uint256 private _status;

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

    constructor() {
        _status = NOT_ENTERED;
    }

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

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}
"
    },
    "contracts/VANcoinStaking.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

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

/**
 * @title VANcoinStaking
 * @dev Simplified staking contract for VANcoin with PFTL wallet integration (V2)
 * 
 * Features:
 * - Fixed 3-month staking period
 * - 1.0x point multiplier (simplified)
 * - PFTL wallet self-registration for airdrops
 * - Enhanced analytics for staker summaries
 * - PFTL address required for withdrawal
 */
contract VANcoinStaking is Ownable, ReentrancyGuard, Pausable {
    
    IERC20 public immutable vanToken;
    
    // Constants - Simplified for V2
    uint256 public constant STAKE_DURATION_MONTHS = 3;
    uint256 public constant SECONDS_PER_DAY = 86400;
    uint256 public constant DAYS_PER_MONTH = 30; // Simplified to 30 days per month
    uint256 public constant TOTAL_STAKE_DURATION = STAKE_DURATION_MONTHS * DAYS_PER_MONTH * SECONDS_PER_DAY;
    
    // Fixed 1.0x multiplier (no scaling)
    uint256 public constant POINTS_MULTIPLIER = 1000; // 1.0x represented as 1000 for precision
    uint256 public constant MULTIPLIER_PRECISION = 1000;
    
    // Staking position structure - simplified
    struct StakePosition {
        uint256 amount;           // Amount of tokens staked
        uint256 startTime;        // When stake was created
        uint256 endTime;          // When stake can be withdrawn (always startTime + TOTAL_STAKE_DURATION)
        uint256 lastPointUpdate;  // Last time points were calculated
        uint256 accruedPoints;    // Total points accrued so far
        bool withdrawn;           // Whether stake has been withdrawn
    }
    
    // PFTL wallet integration
    mapping(address => string) public ethToPftl;     // ETH address -> PFTL address
    mapping(string => address) public pftlToEth;     // PFTL address -> ETH address
    mapping(address => bool) public hasPftlAddress;  // Quick check if user has PFTL set
    
    // User data
    mapping(address => StakePosition[]) public userPositions;
    mapping(address => uint256) public totalUserPoints;
    mapping(address => uint256) public totalUserStaked;  // New: track total staked per user
    
    // Enhanced tracking for analytics
    address[] public allStakers;                     // List of all stakers
    mapping(address => bool) public isStaker;        // Quick check if address is a staker
    mapping(address => uint256) public stakerIndex;  // Index in allStakers array
    
    // Global stats
    uint256 public totalStaked;
    uint256 public totalPositions;
    uint256 public totalPointsIssued;
    uint256 public totalStakers;
    
    // Events
    event Staked(
        address indexed user, 
        uint256 indexed positionId, 
        uint256 amount, 
        uint256 endTime
    );
    
    event Withdrawn(
        address indexed user, 
        uint256 indexed positionId, 
        uint256 amount, 
        uint256 finalPoints
    );
    
    event PointsUpdated(
        address indexed user, 
        uint256 indexed positionId, 
        uint256 pointsEarned,
        uint256 totalPoints
    );
    
    event PftlAddressSet(
        address indexed ethAddress,
        string indexed pftlAddress
    );
    
    // Staker summary struct for analytics
    struct StakerSummary {
        address ethAddress;
        string pftlAddress;
        uint256 totalStaked;
        uint256 totalPoints;
        uint256 activePositions;
        bool canWithdrawAny;
    }
    
    constructor(address _vanToken, address _initialOwner) Ownable(_initialOwner) {
        require(_vanToken != address(0), "Invalid token address");
        vanToken = IERC20(_vanToken);
    }
    
    /**
     * @dev Validate PFTL address format (XRPL-like)
     * @param pftlAddress The PFTL address to validate
     * @return valid Whether the address is valid
     */
    function isValidPftlAddress(string memory pftlAddress) public pure returns (bool valid) {
        bytes memory addr = bytes(pftlAddress);
        
        // Check length (XRPL addresses are typically 25-35 characters)
        if (addr.length < 25 || addr.length > 35) {
            return false;
        }
        
        // Check if starts with 'r' (like XRP addresses)
        if (addr[0] != 0x72) { // 0x72 is 'r' in ASCII
            return false;
        }
        
        // Basic character validation (alphanumeric, case-sensitive)
        for (uint256 i = 1; i < addr.length; i++) {
            bytes1 char = addr[i];
            if (!(
                (char >= 0x30 && char <= 0x39) || // 0-9
                (char >= 0x41 && char <= 0x5A) || // A-Z
                (char >= 0x61 && char <= 0x7A)    // a-z
            )) {
                return false;
            }
        }
        
        return true;
    }
    
    /**
     * @dev Set PFTL wallet address for airdrop registration
     * @param pftlAddress The PFTL wallet address (XRPL format)
     */
    function setPftl(string calldata pftlAddress) external {
        require(bytes(pftlAddress).length > 0, "PFTL address cannot be empty");
        require(isValidPftlAddress(pftlAddress), "Invalid PFTL address format");
        
        // If user already has a PFTL address, clear the old mapping
        string memory oldPftl = ethToPftl[msg.sender];
        if (bytes(oldPftl).length > 0) {
            delete pftlToEth[oldPftl];
        }
        
        // Set new mappings (allowing duplicate PFTL addresses)
        ethToPftl[msg.sender] = pftlAddress;
        pftlToEth[pftlAddress] = msg.sender;
        hasPftlAddress[msg.sender] = true;
        
        emit PftlAddressSet(msg.sender, pftlAddress);
    }
    
    /**
     * @dev Get PFTL address by ETH address
     * @param ethAddress The Ethereum address
     * @return pftlAddress The associated PFTL address
     */
    function getPftlByEth(address ethAddress) external view returns (string memory pftlAddress) {
        return ethToPftl[ethAddress];
    }
    
    /**
     * @dev Get ETH address by PFTL address
     * @param pftlAddress The PFTL address
     * @return ethAddress The associated Ethereum address
     */
    function getEthByPftl(string calldata pftlAddress) external view returns (address ethAddress) {
        return pftlToEth[pftlAddress];
    }
    
    /**
     * @dev Get all ETH <> PFTL associations in bulk
     * @return ethAddresses Array of ETH addresses that have PFTL set
     * @return pftlAddresses Array of corresponding PFTL addresses
     */
    function getAllEthPftlAssociations() external view returns (
        address[] memory ethAddresses,
        string[] memory pftlAddresses
    ) {
        // Count addresses with PFTL set
        uint256 count = 0;
        for (uint256 i = 0; i < allStakers.length; i++) {
            if (hasPftlAddress[allStakers[i]]) {
                count++;
            }
        }
        
        // Create arrays with correct size
        ethAddresses = new address[](count);
        pftlAddresses = new string[](count);
        
        // Fill arrays with associations
        uint256 index = 0;
        for (uint256 i = 0; i < allStakers.length; i++) {
            address staker = allStakers[i];
            if (hasPftlAddress[staker]) {
                ethAddresses[index] = staker;
                pftlAddresses[index] = ethToPftl[staker];
                index++;
            }
        }
        
        return (ethAddresses, pftlAddresses);
    }
    
    /**
     * @dev Get all ETH addresses that have PFTL set
     * @return addresses Array of ETH addresses with PFTL associations
     */
    function getAllEthAddressesWithPftl() external view returns (address[] memory addresses) {
        // Count addresses with PFTL set
        uint256 count = 0;
        for (uint256 i = 0; i < allStakers.length; i++) {
            if (hasPftlAddress[allStakers[i]]) {
                count++;
            }
        }
        
        // Create array with correct size
        addresses = new address[](count);
        
        // Fill array
        uint256 index = 0;
        for (uint256 i = 0; i < allStakers.length; i++) {
            address staker = allStakers[i];
            if (hasPftlAddress[staker]) {
                addresses[index] = staker;
                index++;
            }
        }
        
        return addresses;
    }
    
    /**
     * @dev Calculate points earned for a position up to current time
     * @param user User address
     * @param positionId Position index
     * @return points Points earned since last update
     */
    function calculatePendingPoints(address user, uint256 positionId) 
        public 
        view 
        returns (uint256 points) 
    {
        require(positionId < userPositions[user].length, "Invalid position");
        
        StakePosition storage position = userPositions[user][positionId];
        
        if (position.withdrawn) {
            return 0;
        }
        
        uint256 currentTime = block.timestamp;
        uint256 lastUpdate = position.lastPointUpdate;
        
        // Don't accrue points beyond the end time
        if (currentTime > position.endTime) {
            currentTime = position.endTime;
        }
        
        if (currentTime <= lastUpdate) {
            return 0;
        }
        
        uint256 daysPassed = (currentTime - lastUpdate) / SECONDS_PER_DAY;
        
        if (daysPassed == 0) {
            return 0;
        }
        
        // Simplified: Points = days * amount * 1.0x multiplier
        points = (daysPassed * position.amount * POINTS_MULTIPLIER) / MULTIPLIER_PRECISION;
        
        return points;
    }
    
    /**
     * @dev Update points for a specific position
     * @param user User address
     * @param positionId Position index
     */
    function updatePositionPoints(address user, uint256 positionId) public {
        require(positionId < userPositions[user].length, "Invalid position");
        
        uint256 pendingPoints = calculatePendingPoints(user, positionId);
        
        if (pendingPoints > 0) {
            StakePosition storage position = userPositions[user][positionId];
            
            position.accruedPoints += pendingPoints;
            position.lastPointUpdate = block.timestamp;
            
            // Don't update beyond end time
            if (position.lastPointUpdate > position.endTime) {
                position.lastPointUpdate = position.endTime;
            }
            
            totalUserPoints[user] += pendingPoints;
            totalPointsIssued += pendingPoints;
            
            emit PointsUpdated(user, positionId, pendingPoints, position.accruedPoints);
        }
    }
    
    /**
     * @dev Update points for all user positions
     * @param user User address
     */
    function updateAllUserPoints(address user) public {
        uint256 positionCount = userPositions[user].length;
        for (uint256 i = 0; i < positionCount; i++) {
            updatePositionPoints(user, i);
        }
    }
    
    /**
     * @dev Stake VANcoin tokens for 3 months
     * @param amount Amount of tokens to stake
     */
    function stake(uint256 amount) 
        external 
        nonReentrant 
        whenNotPaused 
    {
        require(amount > 0, "Amount must be greater than 0");
        
        // Transfer tokens from user
        require(vanToken.transferFrom(msg.sender, address(this), amount), "Transfer failed");
        
        // Calculate end time (fixed 3 months)
        uint256 endTime = block.timestamp + TOTAL_STAKE_DURATION;
        
        // Create new position
        StakePosition memory newPosition = StakePosition({
            amount: amount,
            startTime: block.timestamp,
            endTime: endTime,
            lastPointUpdate: block.timestamp,
            accruedPoints: 0,
            withdrawn: false
        });
        
        userPositions[msg.sender].push(newPosition);
        uint256 positionId = userPositions[msg.sender].length - 1;
        
        // Update user tracking
        totalUserStaked[msg.sender] += amount;
        
        // Add to stakers list if first time staking
        if (!isStaker[msg.sender]) {
            allStakers.push(msg.sender);
            stakerIndex[msg.sender] = allStakers.length - 1;
            isStaker[msg.sender] = true;
            totalStakers++;
        }
        
        // Update global stats
        totalStaked += amount;
        totalPositions++;
        
        emit Staked(msg.sender, positionId, amount, endTime);
    }
    
    /**
     * @dev Withdraw staked tokens after 3 months (requires PFTL address)
     * @param positionId Position index to withdraw
     */
    function withdraw(uint256 positionId) 
        external 
        nonReentrant 
        whenNotPaused 
    {
        require(positionId < userPositions[msg.sender].length, "Invalid position");
        require(hasPftlAddress[msg.sender], "Must set PFTL address before withdrawal");
        
        StakePosition storage position = userPositions[msg.sender][positionId];
        
        require(!position.withdrawn, "Position already withdrawn");
        require(block.timestamp >= position.endTime, "Staking period not ended");
        
        // Update points one final time
        updatePositionPoints(msg.sender, positionId);
        
        uint256 amount = position.amount;
        uint256 finalPoints = position.accruedPoints;
        
        // Mark as withdrawn
        position.withdrawn = true;
        
        // Update user tracking
        totalUserStaked[msg.sender] -= amount;
        
        // Update global stats
        totalStaked -= amount;
        
        // Transfer tokens back to user
        require(vanToken.transfer(msg.sender, amount), "Transfer failed");
        
        emit Withdrawn(msg.sender, positionId, amount, finalPoints);
    }
    
    /**
     * @dev Get user's position count
     * @param user User address
     * @return count Number of positions
     */
    function getUserPositionCount(address user) external view returns (uint256) {
        return userPositions[user].length;
    }
    
    /**
     * @dev Get detailed position information
     * @param user User address
     * @param positionId Position index
     * @return position StakePosition struct
     * @return pendingPoints Points pending since last update
     * @return canWithdraw Whether position can be withdrawn
     */
    function getPositionDetails(address user, uint256 positionId) 
        external 
        view 
        returns (
            StakePosition memory position,
            uint256 pendingPoints,
            bool canWithdraw
        ) 
    {
        require(positionId < userPositions[user].length, "Invalid position");
        
        position = userPositions[user][positionId];
        pendingPoints = calculatePendingPoints(user, positionId);
        canWithdraw = !position.withdrawn && 
                     block.timestamp >= position.endTime && 
                     hasPftlAddress[user];
    }
    
    /**
     * @dev Get user's total points (including pending)
     * @param user User address
     * @return totalPoints Total points earned
     */
    function getUserTotalPoints(address user) external view returns (uint256 totalPoints) {
        totalPoints = totalUserPoints[user];
        
        // Add pending points from all positions
        uint256 positionCount = userPositions[user].length;
        for (uint256 i = 0; i < positionCount; i++) {
            totalPoints += calculatePendingPoints(user, i);
        }
    }
    
    /**
     * @dev Get total number of stakers
     * @return count Number of unique stakers
     */
    function getStakerCount() external view returns (uint256 count) {
        return totalStakers;
    }
    
    /**
     * @dev Get all stakers with their totals (for analytics)
     * @return summaries Array of StakerSummary structs
     */
    function getAllStakersWithTotals() external view returns (StakerSummary[] memory summaries) {
        summaries = new StakerSummary[](allStakers.length);
        
        for (uint256 i = 0; i < allStakers.length; i++) {
            address staker = allStakers[i];
            uint256 positionCount = userPositions[staker].length;
            uint256 activePositions = 0;
            uint256 totalPoints = totalUserPoints[staker];
            bool canWithdrawAny = false;
            
            // Count active positions and calculate total points including pending
            for (uint256 j = 0; j < positionCount; j++) {
                StakePosition storage position = userPositions[staker][j];
                if (!position.withdrawn) {
                    activePositions++;
                    totalPoints += calculatePendingPoints(staker, j);
                    
                    // Check if any position can be withdrawn
                    if (block.timestamp >= position.endTime && hasPftlAddress[staker]) {
                        canWithdrawAny = true;
                    }
                }
            }
            
            summaries[i] = StakerSummary({
                ethAddress: staker,
                pftlAddress: ethToPftl[staker],
                totalStaked: totalUserStaked[staker],
                totalPoints: totalPoints,
                activePositions: activePositions,
                canWithdrawAny: canWithdrawAny
            });
        }
        
        return summaries;
    }
    
    /**
     * @dev Get contract statistics
     * @return stats Array containing [totalStaked, totalPositions, totalPointsIssued, totalStakers]
     */
    function getContractStats() external view returns (uint256[4] memory stats) {
        stats[0] = totalStaked;
        stats[1] = totalPositions;
        stats[2] = totalPointsIssued;
        stats[3] = totalStakers;
    }
    
    // Admin functions
    
    /**
     * @dev Pause the contract (emergency only)
     */
    function pause() external onlyOwner {
        _pause();
    }
    
    /**
     * @dev Unpause the contract
     */
    function unpause() external onlyOwner {
        _unpause();
    }
    
    /**
     * @dev Emergency function to recover accidentally sent tokens (not VAN tokens)
     * @param token Token address
     * @param amount Amount to recover
     */
    function recoverToken(address token, uint256 amount) external onlyOwner {
        require(token != address(vanToken), "Cannot recover staked VAN tokens");
        IERC20(token).transfer(owner(), amount);
    }
    
    /**
     * @dev Emergency function to recover accidentally sent ETH
     */
    function recoverETH() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}