//SPDX-License-Identifier: MIT

pragma solidity 0.8.15;

interface IERC20 {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function transfer(address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}
library SafeMath {
    function add(uint a, uint b) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint a, uint b) internal pure returns (uint) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        require(b <= a, errorMessage);
        uint c = a - b;

        return c;
    }
    function mul(uint a, uint b) internal pure returns (uint) {
        if (a == 0) {
            return 0;
        }

        uint c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }
    function div(uint a, uint b) internal pure returns (uint) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint c = a / b;

        return c;
    }
}

contract Context {
    constructor () { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address) {
        return msg.sender;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
       
        _owner = msg.sender ;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @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;
    }
}


contract ERC20Detailed {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory tname, string memory tsymbol, uint8 tdecimals) {
        _name = tname;
        _symbol = tsymbol;
        _decimals = tdecimals;
        
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}



library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

library SafeERC20 {
    using SafeMath for uint;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}


interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}



interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}


contract Flasko is Context, Ownable, IERC20, ERC20Detailed {
  using SafeERC20 for IERC20;
  using Address for address;
  using SafeMath for uint256;
  
    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    
    mapping (address => uint) internal _balances;
    mapping (address => mapping (address => uint)) internal _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    
    uint256 internal _totalSupply;


    uint256 private marketingFee;
    uint256 private burnFee;
    uint256 private liquidityFee;
    uint256 private totalFee;

    uint256 public BUYmarketingFee = 4;
    uint256 public BUYburnFee = 1;
    uint256 public BUYliquidityFee = 2;
    uint256 public BUYtotalFee = BUYliquidityFee.add(BUYmarketingFee).add(BUYburnFee);

    uint256 public SELLmarketingFee = 9;
    uint256 public SELLburnFee = 2;
    uint256 public SELLliquidityFee = 3;
    uint256 public SELLtotalFee = SELLliquidityFee.add(SELLmarketingFee).add(SELLburnFee);


    address payable public marketingaddress = payable(0x1dd14b218377a5dcEF9e3BB641de27a07a638487);
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
   

    uint256 public numTokensSellToAddToLiquidity = 100000 * 10**18;
    uint256 public maxTxAmount =   1000000000 * 10**18;
   
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
     event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );

    bool private swapping;
    
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
  
    address public _owner;
  
    constructor () ERC20Detailed("Flasko", "FLSK", 18) {
      _owner = msg.sender ;
    _totalSupply = 1000000000 * (10**18);
    
	_balances[_owner] = _totalSupply;
	//uniswapv3 router = 0xE592427A0AEce92De3Edee1F18E0157C05861564
	 IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
         // Create a uniswap pair for this new token
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        // set the rest of the contract variables
        uniswapV2Router = _uniswapV2Router;


          //exclude owner and this contract from fee
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[marketingaddress] = true;

     emit Transfer(address(0), _msgSender(), _totalSupply);
  }
  
    function totalSupply() public view override returns (uint) {
        return _totalSupply;
    }
    function balanceOf(address account) public view override returns (uint) {
        return _balances[account];
    }
    function transfer(address recipient, uint amount) public override  returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address towner, address spender) public view override returns (uint) {
        return _allowances[towner][spender];
    }
    function approve(address spender, uint amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint 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 increaseAllowance(address spender, uint addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function setMarketingAddress(address payable wallet) external onlyOwner
    {
        marketingaddress = wallet;
    }



    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }

    function changeNumTokensSellToAddToLiquidity(uint256 _numTokensSellToAddToLiquidity) external onlyOwner
    {
        numTokensSellToAddToLiquidity = _numTokensSellToAddToLiquidity;
    }
    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }
    
    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }


        function changeMaxTxLimit(uint256 _number) external onlyOwner
    {
        maxTxAmount = _number;
    }
   
     //to recieve ETH from uniswapV2Router when swaping
    receive() external payable {}
    function _transfer(address sender, address recipient, uint amount) internal{

        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        if(sender != owner() && recipient != owner())
        {
            require(amount <= maxTxAmount, "Transaction size limit reached");
        }

        // is the token balance of this contract address over the min number of
        // tokens that we need to initiate a swap + liquidity lock?
        // also, don't get caught in a circular liquidity event.
        // also, don't swap & liquify if sender is uniswap pair.
        uint256 contractTokenBalance = balanceOf(address(this));
        

        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
        if (
            overMinTokenBalance &&
            !swapping &&
            sender != uniswapV2Pair &&
            swapAndLiquifyEnabled
        ) {
            swapping = true;
           
            uint256 walletTokens = contractTokenBalance.mul(SELLmarketingFee).div(SELLtotalFee);
            uint256 contractBalance = address(this).balance;
            swapTokensForEth(walletTokens);
            uint256 newBalance = address(this).balance.sub(contractBalance);
            uint256 marketingShare = newBalance.mul(SELLmarketingFee).div((SELLmarketingFee));
            //uint256 rewardShare = newBalance.sub(marketingShare);
            payable(marketingaddress).transfer(marketingShare);

            uint256 swapTokens = contractTokenBalance.mul(SELLliquidityFee).div(SELLtotalFee);
            swapAndLiquify(swapTokens);

            swapping = false;

        }
        
         //indicates if fee should be deducted from transfer
        bool takeFee = !swapping;
        
        //if any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFee[sender] || _isExcludedFromFee[recipient]){
            takeFee = false;
        }

        if(sender != uniswapV2Pair && recipient != uniswapV2Pair)
        {
            takeFee = false;
        }
        if(takeFee){
        if(sender == uniswapV2Pair)
        {
            marketingFee = BUYmarketingFee;
            liquidityFee = BUYliquidityFee;
            burnFee = BUYburnFee;
            totalFee = BUYtotalFee;
           
        }
        if(recipient == uniswapV2Pair)
        {
            marketingFee = SELLmarketingFee;
            liquidityFee = SELLliquidityFee;
            burnFee = SELLburnFee;
            totalFee = SELLtotalFee;

        }
        }
       
        if(takeFee)
        {
            uint256 taxAmount = amount.mul(totalFee).div(100);
            uint256 burnAmount = taxAmount.mul(burnFee).div(totalFee);
            taxAmount = taxAmount - burnAmount; /** modifications as per auditors recommendations */
            uint256 TotalSent = amount.sub(taxAmount);
            _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
            _balances[recipient] = _balances[recipient].add(TotalSent);
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            _balances[address(0)] = _balances[address(0)].add(burnAmount);
            emit Transfer(sender, recipient, TotalSent);
            emit Transfer(sender, address(this), taxAmount);
            emit Transfer(sender, address(0), burnAmount);
        }
        else
        {
            _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
            _balances[recipient] = _balances[recipient].add(amount);
            emit Transfer(sender, recipient, amount);
        }

      
    }


    function setSellFee(uint256 _onSellEthBurnFee, uint256 _onSellliquidityFee, uint256 _onSellMarketingFee) public onlyOwner {

        SELLmarketingFee = _onSellMarketingFee;
        SELLburnFee = _onSellEthBurnFee;
        SELLliquidityFee = _onSellliquidityFee;
        SELLtotalFee = SELLliquidityFee.add(SELLmarketingFee).add(SELLburnFee);
        uint256  onSelltotalFees;
        onSelltotalFees = SELLmarketingFee.add(SELLburnFee).add(SELLliquidityFee);
        require(onSelltotalFees <= 15, "Sell Fee should be 15% or less");
    }

    function setBuyFee(uint256 _onBuyBurnFee, uint256 _onBuyliquidityFee, uint256 _onBuyMarketingFee) public onlyOwner {

        BUYmarketingFee = _onBuyMarketingFee;
        BUYburnFee = _onBuyBurnFee;
        BUYliquidityFee = _onBuyliquidityFee;
        BUYtotalFee = BUYliquidityFee.add(BUYmarketingFee).add(BUYburnFee);
        uint256  onBuytotalFees;
        onBuytotalFees = BUYmarketingFee.add(BUYburnFee).add(BUYliquidityFee);
        require(onBuytotalFees <= 15, "Buy Fee should be 15% or less");
    }


     function swapAndLiquify(uint256 tokens) private lockTheSwap {
       
       // split the contract balance into halves
        uint256 half = tokens.div(2);
        uint256 otherHalf = tokens.sub(half);

        // capture the contract's current ETH balance.
        // this is so that we can capture exactly the amount of ETH that the
        // swap creates, and not make the liquidity event include any ETH that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for ETH
        swapTokensForEth(half); // <- this breaks the ETH -> HATE swap when swap+liquify is triggered

        // how much ETH did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);

        // add liquidity to uniswap
        addLiquidity(otherHalf, newBalance);

        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

      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
            owner(),
            block.timestamp
        );

    }

    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 _approve(address towner, address spender, uint amount) internal {
        require(towner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[towner][spender] = amount;
        emit Approval(towner, spender, amount);
    }

    function withdrawStuckETh() external onlyOwner{
        require (address(this).balance > 0, "Can't withdraw negative or zero");
        payable(owner()).transfer(address(this).balance);
    }



    function removeStuckToken(address _address) external onlyOwner {
        require(_address != address(this), "Can't withdraw tokens destined for liquidity");
        require(IERC20(_address).balanceOf(address(this)) > 0, "Can't withdraw 0");

        IERC20(_address).transfer(owner(), IERC20(_address).balanceOf(address(this)));
    } 

}