//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

/**
 * @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;
    }
}


abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}


////// src/IUniswapV2Factory.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

////// src/IUniswapV2Pair.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

////// src/IUniswapV2Router02.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}


contract VTERRAFORM is Ownable, IERC20, IERC20Metadata{
    using SafeMath for uint256;
    address UNISWAPROUTER = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    DividendTracker public dividendTracker;
    IUniswapV2Router02 public uniswapV2Router;
    bool public compoundingEnabled = false;

    address public uniswapV2Pair;
    event CompoundingEnabled(bool enabled);


    constructor () {
        _name = 'vTerraform';
        _symbol = 'VTERRAFORM';
        _decimals = 18;
        _totalSupply = 100_000_000_000_000 * 1e18;
        _balances[msg.sender] = _totalSupply;
        
        dividendTracker = new DividendTracker(address(this), UNISWAPROUTER);
        dividendTracker.excludeFromDividends(address(dividendTracker), true);
        dividendTracker.excludeFromDividends(address(this), true);
        dividendTracker.excludeFromDividends(owner(), true);

        emit Transfer(address(0), msg.sender, _totalSupply); // Optional
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        dividendTracker.setBalance(payable(sender), _balances[sender]);
        dividendTracker.setBalance(payable(recipient), _balances[recipient]);
        emit Transfer(sender, recipient, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

  
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { 
        
    }

   function setCompoundingEnabled(bool _enabled) external onlyOwner {
        compoundingEnabled = _enabled;
        emit CompoundingEnabled(_enabled);
    }

    function manualSendDividend(uint256 amount, address holder) external onlyOwner {
        dividendTracker.manualSendDividend(amount, holder);
    }
 
   function excludeFromDividends(address account, bool excluded) public onlyOwner {
        dividendTracker.excludeFromDividends(account, excluded);
    }

    function isExcludedFromDividends(address account) public view returns (bool) {
        return dividendTracker.isExcludedFromDividends(account);
    }

    function currentDividendsBalance(address account) public view returns (uint256) {
        return dividendTracker.currentDividendsBalance(account);
    }

   function claim() public {
        dividendTracker.processAccount(payable(_msgSender()));
    }

    function compound() public {
        require(compoundingEnabled, "vTerra: compounding is not enabled");
        dividendTracker.compoundAccount(payable(_msgSender()));
    }

    function withdrawableDividendOf(address account)
        public
        view
        returns (uint256)
    {
        return dividendTracker.withdrawableDividendOf(account);
    }

    function withdrawnDividendOf(address account)
        public
        view
        returns (uint256)
    {
        return dividendTracker.withdrawnDividendOf(account);
    }

    function accumulativeDividendOf(address account)
        public
        view
        returns (uint256)
    {
        return dividendTracker.accumulativeDividendOf(account);
    }

    function getAccountInfo(address account)
        public
        view
        returns (
            address,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        return dividendTracker.getAccountInfo(account);
    }

    function getLastClaimTime(address account) public view returns (uint256) {
        return dividendTracker.getLastClaimTime(account);
    }
 
   function rescueToken(address _token, uint256 _amount) external onlyOwner {
        IERC20(_token).transfer(msg.sender, _amount);
    }

   function rescueETH(uint256 _amount) external onlyOwner {
        payable(msg.sender).transfer(_amount);
    }

}

contract DividendTracker is Ownable, IERC20 {
    address UNISWAPROUTER;

    string private _name = "vTerra Tribute Fund";
    string private _symbol = "vTerra_TributeFund";

    uint256 public lastProcessedIndex;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

    uint256 private constant magnitude = 2**128;
    uint256 public immutable minTokenBalanceForDividends;
    uint256 private magnifiedDividendPerShare;
    uint256 public totalDividendsDistributed;
    uint256 public totalDividendsWithdrawn;

    address public tokenAddress;

    mapping(address => bool) public excludedFromDividends;
    mapping(address => int256) private magnifiedDividendCorrections;
    mapping(address => uint256) private withdrawnDividends;
    mapping(address => uint256) private lastClaimTimes;

    event DividendsDistributed(address indexed from, uint256 weiAmount);
    event DividendWithdrawn(address indexed to, uint256 weiAmount);
    event ExcludeFromDividends(address indexed account, bool excluded);
    event Claim(address indexed account, uint256 amount);
    event Compound(address indexed account, uint256 amount, uint256 tokens);

    struct AccountInfo {
        address account;
        uint256 withdrawableDividends;
        uint256 totalDividends;
        uint256 lastClaimTime;
    }

    constructor(address _tokenAddress, address _uniswapRouter) {
        minTokenBalanceForDividends = 1 * (10**18);
        tokenAddress = _tokenAddress;
        UNISWAPROUTER = _uniswapRouter;
    }

    receive() external payable {
        distributeDividends();
    }

    function distributeDividends() public payable {
        require(_totalSupply > 0);
        if (msg.value > 0) {
            magnifiedDividendPerShare =
                magnifiedDividendPerShare +
                ((msg.value * magnitude) / _totalSupply);
            emit DividendsDistributed(msg.sender, msg.value);
            totalDividendsDistributed += msg.value;
        }
    }

    function setBalance(address payable account, uint256 newBalance)
        external
        onlyOwner
    {
        if (excludedFromDividends[account]) {
            return;
        }
        if (newBalance >= minTokenBalanceForDividends) {
            _setBalance(account, newBalance);
        } else {
            _setBalance(account, 0);
        }
    }

    function excludeFromDividends(address account, bool excluded)
        external
        onlyOwner
    {
        require(
            excludedFromDividends[account] != excluded,
            "vTerra_DividendTracker: account already set to requested state"
        );
        excludedFromDividends[account] = excluded;
        if (excluded) {
            _setBalance(account, 0);
        } else {
            uint256 newBalance = IERC20(tokenAddress).balanceOf(account);
            if (newBalance >= minTokenBalanceForDividends) {
                _setBalance(account, newBalance);
            } else {
                _setBalance(account, 0);
            }
        }
        emit ExcludeFromDividends(account, excluded);
    }

    function isExcludedFromDividends(address account)
        public
        view
        returns (bool)
    {
        return excludedFromDividends[account];
    }

    function manualSendDividend(uint256 amount, address holder)
        external
        onlyOwner
    {
        uint256 contractETHBalance = address(this).balance;
        payable(holder).transfer(amount > 0 ? amount : contractETHBalance);
    }

    function _setBalance(address account, uint256 newBalance) internal {
        uint256 currentBalance = _balances[account];
        if (newBalance > currentBalance) {
            uint256 addAmount = newBalance - currentBalance;
            _mint(account, addAmount);
        } else if (newBalance < currentBalance) {
            uint256 subAmount = currentBalance - newBalance;
            _burn(account, subAmount);
        }
    }

    function _mint(address account, uint256 amount) private {
        require(
            account != address(0),
            "vTerra_DividendTracker: mint to the zero address"
        );
        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
        magnifiedDividendCorrections[account] =
            magnifiedDividendCorrections[account] -
            int256(magnifiedDividendPerShare * amount);
    }

    function _burn(address account, uint256 amount) private {
        require(
            account != address(0),
            "vTerra_DividendTracker: burn from the zero address"
        );
        uint256 accountBalance = _balances[account];
        require(
            accountBalance >= amount,
            "vTerra_DividendTracker: burn amount exceeds balance"
        );
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;
        emit Transfer(account, address(0), amount);
        magnifiedDividendCorrections[account] =
            magnifiedDividendCorrections[account] +
            int256(magnifiedDividendPerShare * amount);
    }

    function processAccount(address payable account)
        public
        onlyOwner
        returns (bool)
    {
        uint256 amount = _withdrawDividendOfUser(account);
        if (amount > 0) {
            lastClaimTimes[account] = block.timestamp;
            emit Claim(account, amount);
            return true;
        }
        return false;
    }

    function _withdrawDividendOfUser(address payable account)
        private
        returns (uint256)
    {
        uint256 _withdrawableDividend = withdrawableDividendOf(account);
        if (_withdrawableDividend > 0) {
            withdrawnDividends[account] += _withdrawableDividend;
            totalDividendsWithdrawn += _withdrawableDividend;
            emit DividendWithdrawn(account, _withdrawableDividend);
            (bool success, ) = account.call{
                value: _withdrawableDividend,
                gas: 3000
            }("");
            if (!success) {
                withdrawnDividends[account] -= _withdrawableDividend;
                totalDividendsWithdrawn -= _withdrawableDividend;
                return 0;
            }
            return _withdrawableDividend;
        }
        return 0;
    }

    function compoundAccount(address payable account)
        public
        onlyOwner
        returns (bool)
    {
        (uint256 amount, uint256 tokens) = _compoundDividendOfUser(account);
        if (amount > 0) {
            lastClaimTimes[account] = block.timestamp;
            emit Compound(account, amount, tokens);
            return true;
        }
        return false;
    }

    function _compoundDividendOfUser(address payable account)
        private
        returns (uint256, uint256)
    {
        uint256 _withdrawableDividend = withdrawableDividendOf(account);
        if (_withdrawableDividend > 0) {
            withdrawnDividends[account] += _withdrawableDividend;
            totalDividendsWithdrawn += _withdrawableDividend;
            emit DividendWithdrawn(account, _withdrawableDividend);

            IUniswapV2Router02 uniswapV2Router = IUniswapV2Router02(
                UNISWAPROUTER
            );

            address[] memory path = new address[](2);
            path[0] = uniswapV2Router.WETH();
            path[1] = address(tokenAddress);

            bool success;
            uint256 tokens;

            uint256 initTokenBal = IERC20(tokenAddress).balanceOf(account);
            try
                uniswapV2Router
                    .swapExactETHForTokensSupportingFeeOnTransferTokens{
                    value: _withdrawableDividend
                }(0, path, address(account), block.timestamp)
            {
                success = true;
                tokens = IERC20(tokenAddress).balanceOf(account) - initTokenBal;
            } catch Error(
                string memory /*err*/
            ) {
                success = false;
            }

            if (!success) {
                withdrawnDividends[account] -= _withdrawableDividend;
                totalDividendsWithdrawn -= _withdrawableDividend;
                return (0, 0);
            }

            return (_withdrawableDividend, tokens);
        }
        return (0, 0);
    }

    function withdrawableDividendOf(address account)
        public
        view
        returns (uint256)
    {
        return accumulativeDividendOf(account) - withdrawnDividends[account];
    }

    function withdrawnDividendOf(address account)
        public
        view
        returns (uint256)
    {
        return withdrawnDividends[account];
    }

      function currentDividendsBalance(address account)
        public
        view
        returns (uint256)
    {
        return _balances[account];
    }

    function accumulativeDividendOf(address account)
        public
        view
        returns (uint256)
    {
        int256 a = int256(magnifiedDividendPerShare * balanceOf(account));
        int256 b = magnifiedDividendCorrections[account]; // this is an explicit int256 (signed)
        return uint256(a + b) / magnitude;
    }

    function getAccountInfo(address account)
        public
        view
        returns (
            address,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        AccountInfo memory info;
        info.account = account;
        info.withdrawableDividends = withdrawableDividendOf(account);
        info.totalDividends = accumulativeDividendOf(account);
        info.lastClaimTime = lastClaimTimes[account];
        return (
            info.account,
            info.withdrawableDividends,
            info.totalDividends,
            info.lastClaimTime,
            totalDividendsWithdrawn
        );
    }

    function getLastClaimTime(address account) public view returns (uint256) {
        return lastClaimTimes[account];
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return 18;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address, uint256) public pure override returns (bool) {
        revert("vTerra_DividendTracker: method not implemented");
    }

    function allowance(address, address)
        public
        pure
        override
        returns (uint256)
    {
        revert("vTerra_DividendTracker: method not implemented");
    }

    function approve(address, uint256) public pure override returns (bool) {
        revert("vTerra_DividendTracker: method not implemented");
    }

    function transferFrom(
        address,
        address,
        uint256
    ) public pure override returns (bool) {
        revert("vTerra_DividendTracker: method not implemented");
    }
}