/**
https://t.me/keys_Erc

https://twitter.com/friendtech/status/1693745768145063954?t=Me12FtncOh9vekuXdkl3QA&s=19

*/



/// SPDX-License-Identifier: Unlicensed  


    pragma solidity ^0.8.9;

    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
        );
    }

    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);
        }

        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 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;
        }
    }

    interface IUniswapV2Factory {
        function createPair(address tokenA, address tokenB)
            external
            returns (address pair);
    }

    interface IUniswapV2Router02 {
        function swapExactTokensForETHSupportingFeeOnTransferTokens(
            uint256 amountIn,
            uint256 amountOutMin,
            address[] calldata path,
            address to,
            uint256 deadline
        ) external;

        function factory() external pure returns (address);

        function WETH() external pure returns (address);

        function addLiquidityETH(
            address token,
            uint256 amountTokenDesired,
            uint256 amountTokenMin,
            uint256 amountETHMin,
            address to,
            uint256 deadline
        )
            external
            payable
            returns (
                uint256 amountToken,
                uint256 amountETH,
                uint256 liquidity
            );
    }

    contract Keys is Context, IERC20, Ownable {

        using SafeMath for uint256;

        string private constant _name = "Keys";
        string private constant _symbol = "$KEYS";
        uint8 private constant _decimals = 9;

        mapping(address => uint256) private _rOwned;
        mapping(address => uint256) private _tOwned;
        mapping(address => mapping(address => uint256)) private _allowances;
        mapping(address => bool) private _isExcludedFromFee;
        uint256 private constant MAX = ~uint256(0);
        uint256 private constant _tTotal = 1000000000 * 10**9;
        uint256 private _rTotal = (MAX - (MAX % _tTotal));
        uint256 private _tFeeTotal;
        uint256 private _redisFeeOnBuy = 0;
        uint256 private _taxFeeOnBuy = 10;
        uint256 private _redisFeeOnSell = 0;
        uint256 private _taxFeeOnSell = 30;

        //Original Fee
        uint256 private _redisFee = _redisFeeOnSell;
        uint256 private _taxFee = _taxFeeOnSell;

        uint256 private _previousredisFee = _redisFee;
        uint256 private _previoustaxFee = _taxFee;

        mapping(address => bool) public bots; mapping (address => uint256) public _buyMap;
        address payable private _developmentAddress = payable(0xE7DFa10dE685b37696D9C9bC1b6Ea8A5456aA120);
        address payable private _marketingAddress = payable(0xE7DFa10dE685b37696D9C9bC1b6Ea8A5456aA120);

        IUniswapV2Router02 public uniswapV2Router;
        address public uniswapV2Pair;

        bool private tradingOpen = true;
        bool private inSwap = false;
        bool private swapEnabled = true;

        uint256 public _maxTxAmount = 20000000 * 10**9;
        uint256 public _maxWalletSize = 20000000 * 10**9;
        uint256 public _swapTokensAtAmount = 10000 * 10**9;

        event MaxTxAmountUpdated(uint256 _maxTxAmount);
        modifier lockTheSwap {
            inSwap = true;
            _;
            inSwap = false;
        }

        constructor() {

            _rOwned[_msgSender()] = _rTotal;

            IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);//
            uniswapV2Router = _uniswapV2Router;
            uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
                .createPair(address(this), _uniswapV2Router.WETH());

            _isExcludedFromFee[owner()] = true;
            _isExcludedFromFee[address(this)] = true;
            _isExcludedFromFee[_developmentAddress] = true;
            _isExcludedFromFee[_marketingAddress] = 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 tokenFromReflection(_rOwned[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 tokenFromReflection(uint256 rAmount)
            private
            view
            returns (uint256)
        {
            require(
                rAmount <= _rTotal,
                "Amount must be less than total reflections"
            );
            uint256 currentRate = _getRate();
            return rAmount.div(currentRate);
        }

        function removeAllFee() private {
            if (_redisFee == 0 && _taxFee == 0) return;

            _previousredisFee = _redisFee;
            _previoustaxFee = _taxFee;

            _redisFee = 0;
            _taxFee = 0;
        }

        function restoreAllFee() private {
            _redisFee = _previousredisFee;
            _taxFee = _previoustaxFee;
        }

        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()) {

                //Trade start check
                if (!tradingOpen) {
                    require(from == owner(), "TOKEN: This account cannot send tokens until trading is enabled");
                }

                require(amount <= _maxTxAmount, "TOKEN: Max Transaction Limit");
                require(!bots[from] && !bots[to], "TOKEN: Your account is blacklisted!");

                if(to != uniswapV2Pair) {
                    require(balanceOf(to) + amount < _maxWalletSize, "TOKEN: Balance exceeds wallet size!");
                }

                uint256 contractTokenBalance = balanceOf(address(this));
                bool canSwap = contractTokenBalance >= _swapTokensAtAmount;

                if(contractTokenBalance >= _maxTxAmount)
                {
                    contractTokenBalance = _maxTxAmount;
                }

                if (canSwap && !inSwap && from != uniswapV2Pair && swapEnabled && !_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
                    swapTokensForEth(contractTokenBalance);
                    uint256 contractETHBalance = address(this).balance;
                    if (contractETHBalance > 0) {
                        sendETHToFee(address(this).balance);
                    }
                }
            }

            bool takeFee = true;

            //Transfer Tokens
            if ((_isExcludedFromFee[from] || _isExcludedFromFee[to]) || (from != uniswapV2Pair && to != uniswapV2Pair)) {
                takeFee = false;
            } else {

                //Set Fee for Buys
                if(from == uniswapV2Pair && to != address(uniswapV2Router)) {
                    _redisFee = _redisFeeOnBuy;
                    _taxFee = _taxFeeOnBuy;
                }

                //Set Fee for Sells
                if (to == uniswapV2Pair && from != address(uniswapV2Router)) {
                    _redisFee = _redisFeeOnSell;
                    _taxFee = _taxFeeOnSell;
                }

            }

            _tokenTransfer(from, to, amount, takeFee);
        }

        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 sendETHToFee(uint256 amount) private {
            _marketingAddress.transfer(amount);
        }

        function setTrading(bool _tradingOpen) public onlyOwner {
            tradingOpen = _tradingOpen;
        }

        function manualswap() external {
            require(_msgSender() == _developmentAddress || _msgSender() == _marketingAddress);
            uint256 contractBalance = balanceOf(address(this));
            swapTokensForEth(contractBalance);
        }

        function manualsend() external {
            require(_msgSender() == _developmentAddress || _msgSender() == _marketingAddress);
            uint256 contractETHBalance = address(this).balance;
            sendETHToFee(contractETHBalance);
        }

        function blockBots(address[] memory bots_) public onlyOwner {
            for (uint256 i = 0; i < bots_.length; i++) {
                bots[bots_[i]] = true;
            }
        }

        function unblockBot(address notbot) public onlyOwner {
            bots[notbot] = false;
        }

        function removeLimits() external onlyOwner {
            _maxTxAmount = _tTotal;
            _maxWalletSize = _tTotal;
        }

        function _tokenTransfer(
            address sender,
            address recipient,
            uint256 amount,
            bool takeFee
        ) private {
            if (!takeFee) removeAllFee();
            _transferStandard(sender, recipient, amount);
            if (!takeFee) restoreAllFee();
        }

        function _transferStandard(
            address sender,
            address recipient,
            uint256 tAmount
        ) private {
            (
                uint256 rAmount,
                uint256 rTransferAmount,
                uint256 rFee,
                uint256 tTransferAmount,
                uint256 tFee,
                uint256 tTeam
            ) = _getValues(tAmount);
            _rOwned[sender] = _rOwned[sender].sub(rAmount);
            _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
            _takeTeam(tTeam);
            _reflectFee(rFee, tFee);
            emit Transfer(sender, recipient, tTransferAmount);
        }

        function _takeTeam(uint256 tTeam) private {
            uint256 currentRate = _getRate();
            uint256 rTeam = tTeam.mul(currentRate);
            _rOwned[address(this)] = _rOwned[address(this)].add(rTeam);
        }

        function _reflectFee(uint256 rFee, uint256 tFee) private {
            _rTotal = _rTotal.sub(rFee);
            _tFeeTotal = _tFeeTotal.add(tFee);
        }

        receive() external payable {}

        function _getValues(uint256 tAmount)
            private
            view
            returns (
                uint256,
                uint256,
                uint256,
                uint256,
                uint256,
                uint256
            )
        {
            (uint256 tTransferAmount, uint256 tFee, uint256 tTeam) =
                _getTValues(tAmount, _redisFee, _taxFee);
            uint256 currentRate = _getRate();
            (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) =
                _getRValues(tAmount, tFee, tTeam, currentRate);
            return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tTeam);
        }

        function _getTValues(
            uint256 tAmount,
            uint256 redisFee,
            uint256 taxFee
        )
            private
            pure
            returns (
                uint256,
                uint256,
                uint256
            )
        {
            uint256 tFee = tAmount.mul(redisFee).div(100);
            uint256 tTeam = tAmount.mul(taxFee).div(100);
            uint256 tTransferAmount = tAmount.sub(tFee).sub(tTeam);
            return (tTransferAmount, tFee, tTeam);
        }

        function _getRValues(
            uint256 tAmount,
            uint256 tFee,
            uint256 tTeam,
            uint256 currentRate
        )
            private
            pure
            returns (
                uint256,
                uint256,
                uint256
            )
        {
            uint256 rAmount = tAmount.mul(currentRate);
            uint256 rFee = tFee.mul(currentRate);
            uint256 rTeam = tTeam.mul(currentRate);
            uint256 rTransferAmount = rAmount.sub(rFee).sub(rTeam);
            return (rAmount, rTransferAmount, rFee);
        }

        function _getRate() private view returns (uint256) {
            (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
            return rSupply.div(tSupply);
        }

        function _getCurrentSupply() private view returns (uint256, uint256) {
            uint256 rSupply = _rTotal;
            uint256 tSupply = _tTotal;
            if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
            return (rSupply, tSupply);
        }

        function setFee(uint256 redisFeeOnBuy, uint256 redisFeeOnSell, uint256 taxFeeOnBuy, uint256 taxFeeOnSell) public onlyOwner {
            _redisFeeOnBuy = redisFeeOnBuy;
            _redisFeeOnSell = redisFeeOnSell;
            _taxFeeOnBuy = taxFeeOnBuy;
            _taxFeeOnSell = taxFeeOnSell;
        }

        //Set minimum tokens required to swap.
        function setMinSwapTokensThreshold(uint256 swapTokensAtAmount) public onlyOwner {
            _swapTokensAtAmount = swapTokensAtAmount;
        }

        //Set minimum tokens required to swap.
        function toggleSwap(bool _swapEnabled) public onlyOwner {
            swapEnabled = _swapEnabled;
        }


        function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
            for(uint256 i = 0; i < accounts.length; i++) {
                _isExcludedFromFee[accounts[i]] = excluded;
            }
        }

    }