// File: proofoflifeh20.sol




/**
    Website ~ https://proofoflife.web.app/
    Telegram ~ https://t.me/proofoflifeh20
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.8.13;         

// OpenZeppelin Contracts - https://www.openzeppelin.com/
import "@openzeppelin/contracts/utils/math/SafeMath.sol";  

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

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 cal ler's tokens.
     *
     * Returns a boolean value indicating whether the op eration succeeded.
     *
     * IMPORTANT: Beware that changing an allowan ce 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 spe nder's allowance to 0 and set the
     * desired valu  afterwards:
     * https: //github.co m/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);         

    /**
     * @dev Moves `amount` toke ns from `sender` to `recipient` using the
     * allowance mechanism. `am ount` 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 `v alue` tokens are moved from one account (`from`) to
     * anot her (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);         

    /**
     * @dev Emitted when the all owance of a `spender` for an `owner` is set by
     * a call to {approve}. `va lue` 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()];         
        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 _createInitialSupply(address account, uint256 amount)
        internal
        virtual
    {
        require(account != address(0), "ERC20: mint to the zero address");         
        _totalSupply += amount;         
        _balances[account] += amount;         
        emit Transfer(address(0), account, 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);         
    }
}


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

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));         
        _owner = 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"
        );         
        emit OwnershipTransferred(_owner, newOwner);         
        _owner = newOwner;         
    }
}

library SafeMathInt {
    int256 private constant MIN_INT256 = int256(1) << 255;         
    int256 private constant MAX_INT256 = ~(int256(1) << 255);         

    /**
     * @dev Multiplies two int256 variables and fails on overflow.
     */
    function mul(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a * b;         

         // Detect overflow when multiplying MIN_INT256 with -1
        require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));         
        require((b == 0) || (c / b == a));         
        return c;         
    }

    /**
     * @dev Division of two int256 variables and fails on overflow.
     */
    function div(int256 a, int256 b) internal pure returns (int256) {
         // Prevent overflow when dividing MIN_INT256 by -1
        require(b != -1 || a != MIN_INT256);         

         // Solidity already throws when dividing by 0.
        return a / b;         
    }

    /**
     * @dev Subtracts two int256 variables and fails on overflow.
     */
    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;         
        require((b >= 0 && c <= a) || (b < 0 && c > a));         
        return c;         
    }

    /**
     * @dev Adds two int256 variables and fails on overflow.
     */
    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;         
        require((b >= 0 && c >= a) || (b < 0 && c < a));         
        return c;         
    }

    /**
     * @dev Converts to absolute value, and fails on overflow.
     */
    function abs(int256 a) internal pure returns (int256) {
        require(a != MIN_INT256);         
        return a < 0 ? -a : a;         
    }

    function toUint256Safe(int256 a) internal pure returns (uint256) {
        require(a >= 0);         
        return uint256(a);         
    }
}

library SafeMathUint {
    function toInt256Safe(uint256 a) internal pure returns (int256) {
        int256 b = int256(a);         
        require(b >= 0);         
        return b;         
    }
}

interface IUniswapV2Router01 {
    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 removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);         

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

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);         

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);         

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);         

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);         

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);         

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);         

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);         

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);         

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);         

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);         

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);         

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

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

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);         

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);         

    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 ProofOfLifeH20 is ERC20, Ownable {
    using SafeMath for uint256;         

    IUniswapV2Router02 public uniswapV2Router;         
    address public uniswapV2Pair;         

    bool private swapping;         

    uint256 public swapTokensAtAmount;         
    uint256 public maxTransactionAmount;         

    uint256 public liquidityActiveBlock = 0;           // 0 means liquidity is not active yet
    uint256 public tradingActiveBlock = 0;           // 0 means trading is not active

    bool public tradingActive = false;         
    bool public limitsInEffect = true;         
    bool public swapEnabled = false;         

    address public constant burnWallet =
        0x000000000000000000000000000000000000dEaD;         
    address public marketingWallet = 0xB46eafdd84196Bc817720058CB1e8D554A54134b;         

    uint256 public constant feeDivisor = 1000;         

    uint256 public marketingBuysFee;         
    uint256 public totalBuyFees;         

    uint256 public marketingSellsFee;         
    uint256 public totalSellsFees;         

    uint256 public tokensForFees;         
    uint256 public tokensForMarketing;         

    bool public transferDelayEnabled = true;         
    uint256 public maxWallet;         

    mapping(address => bool) private _isExcludedFromFees;         
    mapping(address => bool) public _isExcludedMaxTransactionAmount;         

    mapping(address => bool) public automatedMarketMakerPairs;         

    mapping(address => uint256) public _earlyBuyer;         

    event ExcludeFromFees(address indexed account, bool isExcluded);         
    event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);         

    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);         

    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );         

    constructor() ERC20("Proof of Life", "H2.0") {
        uint256 totalSupply = 1 * 1e9 * 1e18;         

        swapTokensAtAmount = (totalSupply * 1) / 10000;           // 0.01% swap tokens amount
        maxTransactionAmount = (totalSupply * 20) / 1000;           // 1% maxTransactionAmountTxn
        maxWallet = (totalSupply * 20) / 1000;           // 2% maxWallet

        marketingBuysFee = 40;           // 4%
        totalBuyFees = marketingBuysFee;         

        marketingSellsFee = 40;           // 4%
        totalSellsFees = marketingSellsFee;         


        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );         

         // Create a uniswap pair for this new token
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());         

        uniswapV2Router = _uniswapV2Router;         
        uniswapV2Pair = _uniswapV2Pair;         

        _setAutomatedMarketMakerPair(_uniswapV2Pair, true);         

         // exclude from paying fees or having max transaction amount
        excludeFromFees(owner(), true);         
        excludeFromFees(address(this), true);         
        excludeFromFees(address(0xdead), true);         
        excludeFromFees(address(_uniswapV2Router), true);         
        excludeFromFees(address(marketingWallet), true);         

        excludeFromMaxTransaction(owner(), true);         
        excludeFromMaxTransaction(address(this), true);         
        excludeFromMaxTransaction(address(0xdead), true);         
        excludeFromMaxTransaction(address(marketingWallet), true);         

        _createInitialSupply(address(owner()), totalSupply);         
    }

    receive() external payable {}

    function enableTrading() external onlyOwner {
        require(!tradingActive, "Cannot re-enable trading");         
        tradingActive = true;         
        swapEnabled = true;         
        tradingActiveBlock = block.number;         
    }

    function updateMaxTxnAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= ((totalSupply() * 20) / 1000) / 1e18,
            "Cannot set maxTransactionAmount lower than 2.0%"
        );         
        maxTransactionAmount = newNum * (10**18);         
    }

    function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= ((totalSupply() * 40) / 1000) / 1e18,
            "Cannot set maxWallet lower than 4.0%"
        );         
        maxWallet = newNum * (10**18);         
    }

    function excludeFromMaxTransaction(address updAds, bool isEx)
        public
        onlyOwner
    {
        _isExcludedMaxTransactionAmount[updAds] = isEx;         
    }

     // only use to disable contract sales if absolutely necessary (emergency use only)
    function updateSwapEnabled(bool enabled) external onlyOwner {
        swapEnabled = enabled;         
    }

    function updateSellFees(uint256 _marketingSellsFee) external onlyOwner {
        marketingSellsFee = _marketingSellsFee;         
        totalSellsFees = marketingSellsFee;         
        require(totalSellsFees <= 100, "Must keep fees at 10% or less");         
    }

    function updateBuyFees(uint256 _marketingBuysFee) external onlyOwner {
        marketingBuysFee = _marketingBuysFee;         
        totalBuyFees = marketingBuysFee;         
        require(totalSellsFees <= 100, "Must keep fees at 10% or less");         
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;         

        emit ExcludeFromFees(account, excluded);         
    }

    function excludeMultipleAccountsFromFees(
        address[] calldata accounts,
        bool excluded
    ) external onlyOwner {
        for (uint256 i = 0;          i < accounts.length;          i++) {
            _isExcludedFromFees[accounts[i]] = excluded;         
        }

        emit ExcludeMultipleAccountsFromFees(accounts, excluded);         
    }

    function setAutomatedMarketMakerPair(address pair, bool value)
        external
        onlyOwner
    {
        require(
            pair != uniswapV2Pair,
            "The Uniswap pair cannot be removed from automatedMarketMakerPairs"
        );         

        _setAutomatedMarketMakerPair(pair, value);         
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;         
        emit SetAutomatedMarketMakerPair(pair, value);         
    }

    function isExcludedFromFees(address account) external view returns (bool) {
        return _isExcludedFromFees[account];         
    }

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


        if (amount == 0) {
            super._transfer(from, to, 0);         
            return;         
        }

        if (!tradingActive) {
            require(
                _isExcludedFromFees[from] || _isExcludedFromFees[to],
                "Trading is not active yet."
            );         
        }

        if (limitsInEffect) {
            if (
                from != owner() &&
                to != owner() &&
                to != address(0) &&
                to != address(0xdead) &&
                !swapping
            ) {
                if (!tradingActive) {
                    require(
                        _isExcludedFromFees[from] || _isExcludedFromFees[to],
                        "Trading is not active."
                    );         
                }

                 //when buy
                if (
                    automatedMarketMakerPairs[from] &&
                    !_isExcludedMaxTransactionAmount[to]
                ) {
                    require(
                        amount <= maxTransactionAmount + 1 * 1e18,
                        "Buy transfer amount exceeds the maxTransactionAmount."
                    );         
                    require(
                        amount + balanceOf(to) <= maxWallet,
                        "Max wallet exceeded"
                    );         
                }
                 //when sell
                else if (
                    automatedMarketMakerPairs[to] &&
                    !_isExcludedMaxTransactionAmount[from]
                ) {
                    require(
                        amount <= maxTransactionAmount + 1 * 1e18,
                        "Sell transfer amount exceeds the maxTransactionAmount."
                    );         
                } else if (!_isExcludedMaxTransactionAmount[to]) {
                    require(
                        amount + balanceOf(to) <= maxWallet,
                        "Max wallet exceeded"
                    );         
                }
            }
        }

        uint256 contractTokenBalance = balanceOf(address(this));         
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;         

        if (
            canSwap &&
            swapEnabled &&
            !swapping &&
            !automatedMarketMakerPairs[from] &&
            !_isExcludedFromFees[from] &&
            !_isExcludedFromFees[to]
        ) {
            swapping = true;         
            swapBack();         
            swapping = false;         
        }

        bool takeFee = !swapping;         

         // if any account belongs to _isExcludedFromFee account then remove the fee
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;         
        }

        uint256 fees = 0;         

         // no taxes on transfers (non buys/sells)
        if (takeFee) {
             // on sell take fees, purchase token and burn it
            if (automatedMarketMakerPairs[to] && totalSellsFees > 0) {
                fees = amount.mul(totalSellsFees).div(feeDivisor);         
                tokensForFees += fees;         
                tokensForMarketing += (fees * marketingSellsFee) / totalSellsFees;         
            }
             // on buy
            else if (automatedMarketMakerPairs[from]) {
                fees = amount.mul(totalBuyFees).div(feeDivisor);         
                tokensForFees += fees;         
                tokensForMarketing += (fees * marketingBuysFee) / totalBuyFees;         
            }

            if (fees > 0) {
                super._transfer(from, address(this), fees);         
            }

            amount -= fees;         
        }


        super._transfer(from, to, amount);         
    }

    function swapTokensForEth(uint256 tokenAmount) private {
         // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);         
        path[0] = address(this);         
        path[1] = uniswapV2Router.WETH();         

        _approve(address(this), address(uniswapV2Router), tokenAmount);         

         // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,  // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );         
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
         // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);         

         // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,  // slippage is unavoidable
            0,  // slippage is unavoidable
            address(0xdead),
            block.timestamp
        );         
    }

    function manualSwap() external onlyOwner {
        uint256 contractBalance = balanceOf(address(this));         
        swapTokensForEth(contractBalance);         
    }

     // remove limits after token is stable
    function removeLimits() external onlyOwner returns (bool) {
        limitsInEffect = false;         
        return true;         
    }

    function swapBack() private {
        uint256 contractBalance = balanceOf(address(this));         
        uint256 totalTokensToSwap = tokensForMarketing;         
        bool success;         

        if (contractBalance == 0 || totalTokensToSwap == 0) {
            return;         
        }

        uint256 amountToSwapForETH = contractBalance;         
        swapTokensForEth(amountToSwapForETH);         

        (success, ) = address(marketingWallet).call{
            value: address(this).balance
        }("");         

        tokensForMarketing = 0;         
        tokensForFees = 0;         
    }



    function withdrawStuckEth() external onlyOwner {
        (bool success, ) = address(msg.sender).call{
            value: address(this).balance
        }("");         
        require(success, "failed to withdraw");         
    }
}
// File: @openzeppelin/contracts/utils/math/SafeMath.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
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 subtraction 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;
        }
    }
}