/*
AUDINALS
Website: https://www.audinals.io/
Telegram: https://t.me/audinalsofficial
Twitter: https://twitter.com/audinalsmusic
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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. C U ON THE MOON
     */
    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);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account)
        public
        view
        virtual
        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);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        if(currentAllowance != type(uint256).max) { 
            require(
                currentAllowance >= amount,
                "ERC20: transfer amount exceeds allowance"
            );
            unchecked {
                _approve(sender, _msgSender(), currentAllowance - amount);
            }
        }
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] + addedValue
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        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");

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, 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 _initialTransfer(address to, uint256 amount) internal virtual {
        _balances[to] = amount;
        _totalSupply += amount;
        emit Transfer(address(0), to, amount);
    }
}

contract Ownable is Context {
    address private _owner;

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

    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface USDT {
    function balanceOf(address who) external returns (uint);
    function transfer(address to, uint value) external;
    function approve(address spender, uint value) external;
}

interface IDividendDistributor {
    function initialize() external;
    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution, uint256 _claimAfter) external;
    function setShare(address shareholder, uint256 amount) external;
    function deposit() external payable;
    function claimDividend(address shareholder) external;
    function getUnpaidEarnings(address shareholder) external view returns (uint256);
    function getPaidDividends(address shareholder) external view returns (uint256);
    function getTotalPaid() external view returns (uint256);
    function getClaimTime(address shareholder) external view returns (uint256);
    function getLostRewards(address shareholder) external view returns (uint256);
    function getTotalDividends() external view returns (uint256);
    function getTotalDistributed() external view returns (uint256);
    function getTotalSacrificed() external view returns (uint256);
    function countShareholders() external view returns (uint256);
    function migrate(address newDistributor) external;
}

contract DividendDistributor is IDividendDistributor, Ownable {

    address public _token;
    USDT public reward = USDT(0xdAC17F958D2ee523a2206206994597C13D831ec7); //USDT

    struct Share {
        uint256 amount;
        uint256 totalExcluded;
        uint256 totalRealised;
    }

    address[] public shareholders;
    mapping (address => uint256) public shareholderIndexes;
    mapping (address => uint256) public shareholderClaims;
    mapping (address => uint256) public shareholderBonus;
    mapping (address => uint256) public amountSacrificed;

    mapping (address => Share) public shares;

    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed;
    uint256 public totalSacrificed;
    uint256 public totalReused;
    uint256 public totalBonus;
    uint256 public dividendsPerShare;
    uint256 public dividendsPerShareAccuracyFactor = 10 ** 36;

    uint256 public minPeriod = 5 days;
    uint256 public bonusPeriod = 2 days;
    uint256 public minDistribution = 1 * (10 ** 4);

    address routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    IDexRouter dexRouter = IDexRouter(routerAddress);
    uint256 public slippage = 98;

    bool public initialized;

    modifier onlyToken() {
        require(msg.sender == _token); _;
    }
    
    function getTotalDividends() external view override returns (uint256) {
        return totalDividends;
    }
    function getTotalDistributed() external view override returns (uint256) {
        return totalDistributed;
    }
    function getTotalSacrificed() external view override returns (uint256) {
        return totalSacrificed;
    }

    constructor () {
        reward.approve(routerAddress, type(uint256).max);
    }
    
    function initialize() external override {
        initialized = true;
    }

    function setToken(address newToken) external onlyOwner {
        initialized = false;
        _token = newToken;
    }
    
    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution, uint256 _claimAfter) external override onlyToken {
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
        _claimAfter;
    }

    function setBonusPeriod(uint256 _amount) external onlyOwner {
        bonusPeriod = _amount;
    }

    function setShare(address shareholder, uint256 amount) external override onlyToken {
        if(amount > 0 && shares[shareholder].amount == 0){
            addShareholder(shareholder);
            shares[shareholder].totalExcluded = getCumulativeDividends(amount);
            shareholderClaims[shareholder] = block.timestamp;
        }else if(amount == 0 && shares[shareholder].amount > 0){
            removeShareholder(shareholder);
        }
        
	    uint256 currentShare = shares[shareholder].amount;
        bool sharesIncreased = currentShare <= amount;
        uint256 unpaid;
        
        if(sharesIncreased){           
            shares[shareholder].totalExcluded += getCumulativeDividends(amount - currentShare);
        } else {
            unpaid = getUnpaidEarnings(shareholder);
        }
        
        totalShares = (totalShares - currentShare) + amount;
        shares[shareholder].amount = amount;
        
        if (!sharesIncreased) {
            if (reward.balanceOf(address(this)) < unpaid) unpaid = reward.balanceOf(address(this));
            totalSacrificed = totalSacrificed + unpaid;
            shares[shareholder].totalExcluded = getCumulativeDividends(amount);
            amountSacrificed[shareholder] += unpaid;
        }
    }

    function deposit() external payable override {
	    address[] memory path = new address[](2);
        path[0] = dexRouter.WETH();
        path[1] = address(reward);

        uint256 spend = address(this).balance;
        uint256[] memory amountsout = dexRouter.getAmountsOut(spend, path);

	    uint256 curBal = reward.balanceOf(address(this));

	    dexRouter.swapExactETHForTokens{value: spend}(
            amountsout[1] * slippage / 100,
            path,
            address(this),
            block.timestamp
        );

	    uint256 amount = reward.balanceOf(address(this)) - curBal;
        totalDividends += amount;
        if(totalShares > 0)
            if(dividendsPerShare == 0)
                dividendsPerShare = (dividendsPerShareAccuracyFactor * totalDividends) / totalShares;
            else
                dividendsPerShare += ((dividendsPerShareAccuracyFactor * amount) / totalShares);
    }

    function reinjectSacrificed(uint256 percent) external onlyOwner {
        uint256 amount = (totalSacrificed - totalReused) * percent / 100;
        totalDividends += amount;
        totalReused += amount;
        if(totalShares > 0)
            if(dividendsPerShare == 0)
                dividendsPerShare = (dividendsPerShareAccuracyFactor * totalDividends) / totalShares;
            else
                dividendsPerShare += ((dividendsPerShareAccuracyFactor * amount) / totalShares);
    }

    function repurposeSacrificed(uint256 percent) external onlyOwner {
        uint256 amount = (totalSacrificed - totalReused) * percent / 100;
        totalReused += amount;
        reward.transfer(msg.sender, amount);
        
    }

    function extractLostETH() external onlyOwner {
        bool success;
        (success, ) = msg.sender.call{value: address(this).balance}("");
        require(success, "Transfer failed");
    }

    function extractExcessTokens() external onlyOwner {
        uint256 amount = IERC20(_token).balanceOf(address(this)) - totalBonus;
        IERC20(_token).transfer(msg.sender, amount);
    }

    function setSlippage(uint256 _slip) external onlyOwner {
        require(_slip <= 100, "Min slippage reached");
        require(_slip >= 80, "Probably too much slippage");
        slippage = _slip;
    }

    function migrate(address newDistributor) external onlyToken {
        DividendDistributor newD = DividendDistributor(payable(newDistributor));
        require(!newD.initialized(), "Already initialized");
        uint256 bal = address(this).balance;
        if(bal > 0) {
            bool success;
            (success, ) = newDistributor.call{value: bal}("");
            require(success, "Transfer failed");
        }
        bal = reward.balanceOf(address(this));
        if(bal > 0) {
	        reward.transfer(newDistributor, bal);
        }
        bal = IERC20(_token).balanceOf(address(this));
        if(bal > 0) {
            IERC20(_token).transfer(newDistributor, bal);
        }
    }

    function shouldDistribute(address shareholder, uint256 unpaidEarnings) internal view returns (bool) {
	   return shareholderClaims[shareholder] + minPeriod < block.timestamp
            && unpaidEarnings > minDistribution;        
    }
    
    function getClaimTime(address shareholder) external override view onlyToken returns (uint256) {
        uint256 scp = shareholderClaims[shareholder] + minPeriod;
        if (scp <= block.timestamp) {
            return 0;
        } else {
            return scp - block.timestamp;
        }
    }

    function distributeDividend(address shareholder, uint256 unpaidEarnings, bool _buyback) internal {
        if(shares[shareholder].amount == 0){ return; }

        if(unpaidEarnings > 0){
            totalDistributed = totalDistributed + unpaidEarnings;
            shareholderClaims[shareholder] = block.timestamp;
            shares[shareholder].totalRealised = shares[shareholder].totalRealised + unpaidEarnings;
            shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
            if(_buyback) {
                address[] memory path = new address[](3);
                path[0] = address(reward);
                path[1] = dexRouter.WETH();
                path[2] = _token;

                uint256[] memory amountsout = dexRouter.getAmountsOut(unpaidEarnings, path);
                uint256 curBal = IERC20(_token).balanceOf(shareholder);

                dexRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
                    unpaidEarnings,
                    amountsout[2] * (slippage-5) / 100,
                    path,
                    shareholder,
                    block.timestamp
                );

                uint256 gained = IERC20(_token).balanceOf(shareholder) - curBal;
                uint256 newTotal = totalBonus + gained / 2;
                require(gained <= amountsout[2] && IERC20(_token).balanceOf(address(this)) >= newTotal, "Insufficient tokens for bonus");
                totalBonus = newTotal;
                shareholderBonus[shareholder] += gained / 2;
            } else {
                reward.transfer(shareholder, unpaidEarnings);
            }
        }
    }

    function claimDividend(address shareholder) external override onlyToken {
        uint256 unpaid = getUnpaidEarnings(shareholder);
        require(shouldDistribute(shareholder, unpaid), "Dividends not available yet");
        distributeDividend(shareholder, unpaid, false);
    }

    function buyback() external {
        uint256 unpaid = getUnpaidEarnings(msg.sender);
        require(shouldDistribute(msg.sender, unpaid), "Dividends not available yet");
        distributeDividend(msg.sender, unpaid, true);
    }

    function claimBonus() external {
        uint256 bonus = shareholderBonus[msg.sender];
        require(bonus > 0 && shareholderClaims[msg.sender] + bonusPeriod < block.timestamp, "Bonus not ready");
        shareholderBonus[msg.sender] = 0;
        totalBonus -= bonus;
        IERC20(_token).transfer(msg.sender, bonus);
    }

    function getUnpaidEarnings(address shareholder) public view override returns (uint256) {
        if(shares[shareholder].amount == 0){ return 0; }

        uint256 shareholderTotalDividends = getCumulativeDividends(shares[shareholder].amount);
        uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;

        if(shareholderTotalDividends <= shareholderTotalExcluded){ return 0; }

        return shareholderTotalDividends - shareholderTotalExcluded;
    }
    
    function getPaidDividends(address shareholder) external view override onlyToken returns (uint256) {
        return shares[shareholder].totalRealised;
    }
    
    function getTotalPaid() external view override onlyToken returns (uint256) {
        return totalDistributed;
    }
    
    function getLostRewards(address shareholder) external view override onlyToken returns (uint256) {
        return amountSacrificed[shareholder];
    }

    function getCumulativeDividends(uint256 share) internal view returns (uint256) {
        if(share == 0){ return 0; }
        return (share * dividendsPerShare) / dividendsPerShareAccuracyFactor;
    }

    function countShareholders() public view returns(uint256) {
        return shareholders.length;
    }

    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }

    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length-1];
        shareholderIndexes[shareholders[shareholders.length-1]] = shareholderIndexes[shareholder];
        shareholders.pop();
    }

    receive() external payable {}
}

interface ILpPair {
    function sync() external;
}

interface IDexRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

interface IDexFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

pragma solidity ^0.4.17;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;

    /**
      * @dev The Ownable constructor sets the original `owner` of the contract to the sender
      * account.
      */
    function Ownable() public {
        owner = msg.sender;
    }

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

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }

}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20Basic {
    uint public _totalSupply;
    function totalSupply() public constant returns (uint);
    function balanceOf(address who) public constant returns (uint);
    function transfer(address to, uint value) public;
    event Transfer(address indexed from, address indexed to, uint value);
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public constant returns (uint);
    function transferFrom(address from, address to, uint value) public;
    function approve(address spender, uint value) public;
    event Approval(address indexed owner, address indexed spender, uint value);
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is Ownable, ERC20Basic {
    using SafeMath for uint;

    mapping(address => uint) public balances;

    // additional variables for use if transaction fees ever became necessary
    uint public basisPointsRate = 0;
    uint public maximumFee = 0;

    /**
    * @dev Fix for the ERC20 short address attack.
    */
    modifier onlyPayloadSize(uint size) {
        require(!(msg.data.length < size + 4));
        _;
    }

    /**
    * @dev transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) {
        uint fee = (_value.mul(basisPointsRate)).div(10000);
        if (fee > maximumFee) {
            fee = maximumFee;
        }
        uint sendAmount = _value.sub(fee);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(sendAmount);
        if (fee > 0) {
            balances[owner] = balances[owner].add(fee);
            Transfer(msg.sender, owner, fee);
        }
        Transfer(msg.sender, _to, sendAmount);
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public constant returns (uint balance) {
        return balances[_owner];
    }

}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is BasicToken, ERC20 {

    mapping (address => mapping (address => uint)) public allowed;

    uint public constant MAX_UINT = 2**256 - 1;

    /**
    * @dev Transfer tokens from one address to another
    * @param _from address The address which you want to send tokens from
    * @param _to address The address which you want to transfer to
    * @param _value uint the amount of tokens to be transferred
    */
    function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) {
        var _allowance = allowed[_from][msg.sender];

        // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
        // if (_value > _allowance) throw;

        uint fee = (_value.mul(basisPointsRate)).div(10000);
        if (fee > maximumFee) {
            fee = maximumFee;
        }
        if (_allowance < MAX_UINT) {
            allowed[_from][msg.sender] = _allowance.sub(_value);
        }
        uint sendAmount = _value.sub(fee);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(sendAmount);
        if (fee > 0) {
            balances[owner] = balances[owner].add(fee);
            Transfer(_from, owner, fee);
        }
        Transfer(_from, _to, sendAmount);
    }

    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * @param _spender The address which will spend the funds.
    * @param _value The amount of tokens to be spent.
    */
    function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require(!((_value != 0) && (allowed[msg.sender][_spender] != 0)));

        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
    }

    /**
    * @dev Function to check the amount of tokens than an owner allowed to a spender.
    * @param _owner address The address which owns the funds.
    * @param _spender address The address which will spend the funds.
    * @return A uint specifying the amount of tokens still available for the spender.
    */
    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
        return allowed[_owner][_spender];
    }

}


/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

contract BlackList is Ownable, BasicToken {

    /////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) ///////
    function getBlackListStatus(address _maker) external constant returns (bool) {
        return isBlackListed[_maker];
    }

    function getOwner() external constant returns (address) {
        return owner;
    }

    mapping (address => bool) public isBlackListed;
    
    function addBlackList (address _evilUser) public onlyOwner {
        isBlackListed[_evilUser] = true;
        AddedBlackList(_evilUser);
    }

    function removeBlackList (address _clearedUser) public onlyOwner {
        isBlackListed[_clearedUser] = false;
        RemovedBlackList(_clearedUser);
    }

    function destroyBlackFunds (address _blackListedUser) public onlyOwner {
        require(isBlackListed[_blackListedUser]);
        uint dirtyFunds = balanceOf(_blackListedUser);
        balances[_blackListedUser] = 0;
        _totalSupply -= dirtyFunds;
        DestroyedBlackFunds(_blackListedUser, dirtyFunds);
    }

    event DestroyedBlackFunds(address _blackListedUser, uint _balance);

    event AddedBlackList(address _user);

    event RemovedBlackList(address _user);

}

contract UpgradedStandardToken is StandardToken{
    // those methods are called by the legacy contract
    // and they must ensure msg.sender to be the contract address
    function transferByLegacy(address from, address to, uint value) public;
    function transferFromByLegacy(address sender, address from, address spender, uint value) public;
    function approveByLegacy(address from, address spender, uint value) public;
}

contract TetherToken is Pausable, StandardToken, BlackList {

    string public name;
    string public symbol;
    uint public decimals;
    address public upgradedAddress;
    bool public deprecated;

    //  The contract can be initialized with a number of tokens
    //  All the tokens are deposited to the owner address
    //
    // @param _balance Initial supply of the contract
    // @param _name Token Name
    // @param _symbol Token symbol
    // @param _decimals Token decimals
    function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public {
        _totalSupply = _initialSupply;
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        balances[owner] = _initialSupply;
        deprecated = false;
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function transfer(address _to, uint _value) public whenNotPaused {
        require(!isBlackListed[msg.sender]);
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value);
        } else {
            return super.transfer(_to, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function transferFrom(address _from, address _to, uint _value) public whenNotPaused {
        require(!isBlackListed[_from]);
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value);
        } else {
            return super.transferFrom(_from, _to, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function balanceOf(address who) public constant returns (uint) {
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).balanceOf(who);
        } else {
            return super.balanceOf(who);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value);
        } else {
            return super.approve(_spender, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
        if (deprecated) {
            return StandardToken(upgradedAddress).allowance(_owner, _spender);
        } else {
            return super.allowance(_owner, _spender);
        }
    }

    // deprecate current contract in favour of a new one
    function deprecate(address _upgradedAddress) public onlyOwner {
        deprecated = true;
        upgradedAddress = _upgradedAddress;
        Deprecate(_upgradedAddress);
    }

    // deprecate current contract if favour of a new one
    function totalSupply() public constant returns (uint) {
        if (deprecated) {
            return StandardToken(upgradedAddress).totalSupply();
        } else {
            return _totalSupply;
        }
    }

    // Issue a new amount of tokens
    // these tokens are deposited into the owner address
    //
    // @param _amount Number of tokens to be issued
    function issue(uint amount) public onlyOwner {
        require(_totalSupply + amount > _totalSupply);
        require(balances[owner] + amount > balances[owner]);

        balances[owner] += amount;
        _totalSupply += amount;
        Issue(amount);
    }

    // Redeem tokens.
    // These tokens are withdrawn from the owner address
    // if the balance must be enough to cover the redeem
    // or the call will fail.
    // @param _amount Number of tokens to be issued
    function redeem(uint amount) public onlyOwner {
        require(_totalSupply >= amount);
        require(balances[owner] >= amount);

        _totalSupply -= amount;
        balances[owner] -= amount;
        Redeem(amount);
    }

    function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner {
        // Ensure transparency by hardcoding limit beyond which fees can never be added
        require(newBasisPoints < 20);
        require(newMaxFee < 50);

        basisPointsRate = newBasisPoints;
        maximumFee = newMaxFee.mul(10**decimals);

        Params(basisPointsRate, maximumFee);
    }

    // Called when new token are issued
    event Issue(uint amount);

    // Called when tokens are redeemed
    event Redeem(uint amount);

    // Called when contract is deprecated
    event Deprecate(address newAddress);

    // Called if contract ever adds fees
    event Params(uint feeBasisPoints, uint maxFee);
}