//SPDX-License-Identifier: MIT
// Telegram: https://t.me/darkmatterportal2022
// Website: not released yet
// Twitter: http://mobile.twitter.com/darkmatinu

pragma solidity ^0.8.12;

uint256 constant INITIAL_TAX=5;
uint256 constant TOTAL_SUPPLY=1000000000;
string constant TOKEN_SYMBOL="DM";
string constant TOKEN_NAME="DarkMatterinu";
uint8 constant DECIMALS=6;
uint256 constant TAX_THRESHOLD=1000000000000000000;

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 factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(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);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

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;
    address private _previousOwner;
    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);
    }

}


contract DarkMatter is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balance;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;

    uint256 private _tTotal = TOTAL_SUPPLY * 10**DECIMALS;


    uint256 private _taxFee;
    address payable private _taxWallet;
    uint256 private _maxTxAmount;


    string private constant _name = TOKEN_NAME;
    string private constant _symbol = TOKEN_SYMBOL;
    uint8 private constant _decimals = DECIMALS;

    IUniswapV2Router02 private _uniswap;
    address private _pair;
    bool private _canTrade;
    bool private _inSwap = false;
    bool private _swapEnabled = false;

    modifier lockTheSwap {
        _inSwap = true;
        _;
        _inSwap = false;
    }
    constructor () {
        _taxWallet = payable(_msgSender());

        _taxFee = INITIAL_TAX;
        _uniswap = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

        _balance[_msgSender()] = _tTotal;

        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
        _maxTxAmount=_tTotal.div(50);
        emit Transfer(address(0x0), _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 view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balance[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 _transfer(address from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");

        if (from != owner() && to != owner()) {
            if (from == _pair && to != address(_uniswap) && ! _isExcludedFromFee[to] ) {
                require(amount<=_maxTxAmount,"Transaction amount limited");
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!_inSwap && from != _pair && _swapEnabled) {
                swapTokensForEth(contractTokenBalance);
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance >= TAX_THRESHOLD) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        _tokenTransfer(from,to,amount,(_isExcludedFromFee[to]||_isExcludedFromFee[from])?0:_taxFee);
    }

    function addToWhitelist(address buyer) public onlyTaxCollector{
        _isExcludedFromFee[buyer]=true;
    }

    function removeFromWhitelist(address buyer) public onlyTaxCollector{
        _isExcludedFromFee[buyer]=false;
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _uniswap.WETH();
        _approve(address(this), address(_uniswap), tokenAmount);
        _uniswap.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
    modifier onlyTaxCollector() {
        require(_taxWallet == _msgSender() );
        _;
    }

    function lowerTax(uint256 newTaxRate) public onlyTaxCollector{
        require(newTaxRate<INITIAL_TAX);
        _taxFee=newTaxRate;
    }

    function removeBuyLimit() public onlyTaxCollector{
        _maxTxAmount=_tTotal;
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function createUniswapPair() external onlyTaxCollector {
        require(!_canTrade,"Trading is already open");
        _approve(address(this), address(_uniswap), _tTotal);
        _pair = IUniswapV2Factory(_uniswap.factory()).createPair(address(this), _uniswap.WETH());
        IERC20(_pair).approve(address(_uniswap), type(uint).max);
    }

    function addLiquidity() external onlyTaxCollector{
        _uniswap.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        _swapEnabled = true;
        _canTrade = true;
    }

    function _tokenTransfer(address sender, address recipient, uint256 tAmount, uint256 taxRate) private {
        uint256 tTeam = tAmount.mul(taxRate).div(100);
        uint256 tTransferAmount = tAmount.sub(tTeam);

        _balance[sender] = _balance[sender].sub(tAmount);
        _balance[recipient] = _balance[recipient].add(tTransferAmount);
        _balance[address(this)] = _balance[address(this)].add(tTeam);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    receive() external payable {}

    function swapForTax() external onlyTaxCollector{
        uint256 contractBalance = balanceOf(address(this));
        swapTokensForEth(contractBalance);
    }

    function collectTax() external onlyTaxCollector{
        uint256 contractETHBalance = address(this).balance;
        sendETHToFee(contractETHBalance);
    }


}