// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;

abstract contract Context {
    function _msgSender() internal view returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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 caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance 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 spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/od/ai/nu/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` 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 `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

library Address {
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }


    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address lpPair, uint);
    function getPair(address tokenA, address tokenB) external view returns (address lpPair);
    function createPair(address tokenA, address tokenB) external returns (address lpPair);
}

interface IUniswapV2Router01 {
    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);
}

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 BlueChedda is Context, IERC20Upgradeable {
    // Ownership moved to in-contract for customizability.
    address private _owner;

    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => bool) lpPairs;
    uint256 private timeSinceLastPair = 0;
    mapping (address => mapping (address => uint256)) private _allowances;

    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private _isExcluded;
    address[] private _excluded;

    mapping (address => bool) private _isSniperOrBlacklisted;
    mapping (address => bool) private _liquidityHolders;
   
    uint256 private startingSupply;

    string private _name;
    string private _symbol;

    uint256 public _reflectFee = 200;
    uint256 public _liquidityFee = 400;
    uint256 public _marketingFee = 600;

    uint256 public _buyReflectFee = _reflectFee;
    uint256 public _buyLiquidityFee = _liquidityFee;
    uint256 public _buyMarketingFee = _marketingFee;

    uint256 public _sellReflectFee = 400;
    uint256 public _sellLiquidityFee = 800;
    uint256 public _sellMarketingFee = 1200;
    
    uint256 public _transferReflectFee = _buyReflectFee;
    uint256 public _transferLiquidityFee = _buyLiquidityFee;
    uint256 public _transferMarketingFee = _buyMarketingFee;
    
    uint256 private maxReflectFee = 1000;
    uint256 private maxLiquidityFee = 1000;
    uint256 private maxMarketingFee = 1500;

    uint256 public _liquidityRatio = 400;
    uint256 public _marketingRatio = 600;

    uint256 private masterTaxDivisor = 10000;

    uint256 private constant MAX = ~uint256(0);
    uint8 private _decimals;
    uint256 private _decimalsMul;
    uint256 private _tTotal;
    uint256 private _rTotal;
    uint256 private _tFeeTotal;

    IUniswapV2Router02 public dexRouter;
    address public lpPair;

    // UNI ROUTER
    address private _routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    address public DEAD = 0x000000000000000000000000000000000000dEaD;
    address public ZERO = 0x0000000000000000000000000000000000000000;
    address payable private _marketingWallet = payable(0x86E2E7eC0f18D35819C335705BDacaFdBFeB2FAE);
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = false;
    
    uint256 private _maxTxAmount;
    uint256 public maxTxAmountUI;

    uint256 private _maxWalletSize;
    uint256 public maxWalletSizeUI;

    uint256 private swapThreshold;
    uint256 private swapAmount;

    bool tradingEnabled = false;

    bool private sniperProtection = true;
    bool public _hasLiqBeenAdded = false;
    uint256 private _liqAddStatus = 0;
    uint256 private _liqAddBlock = 0;
    uint256 private _liqAddStamp = 0;
    uint256 private _initialLiquidityAmount = 0;
    uint256 private snipeBlockAmt = 0;
    uint256 public snipersCaught = 0;
    bool private gasLimitActive = true;
    uint256 private gasPriceLimit;
    bool private sameBlockActive = true;
    mapping (address => uint256) private lastTrade;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    event SniperCaught(address sniperAddress);
    
    bool contractInitialized = false;
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    
    constructor () payable {
        // Set the owner.
        _owner = msg.sender;

        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _liquidityHolders[owner()] = true;

        // Approve the owner for PancakeSwap, timesaver.
        _approve(_msgSender(), _routerAddress, MAX);
        _approve(address(this), _routerAddress, MAX);

        // Ever-growing sniper/tool blacklist
    }

    receive() external payable {}

    function intializeContract() external onlyOwner {
        require(!contractInitialized, "Contract already initialized.");
        _name = "BlueChedda";
        _symbol = "BChedda";
        startingSupply = 100_000_000_000_000;
        if (startingSupply < 10000000000) {
            _decimals = 18;
            _decimalsMul = _decimals;
        } else {
            _decimals = 9;
            _decimalsMul = _decimals;
        }
        _tTotal = startingSupply * (10**_decimalsMul);
        _rTotal = (MAX - (MAX % _tTotal));

        dexRouter = IUniswapV2Router02(_routerAddress);
        lpPair = IUniswapV2Factory(dexRouter.factory()).createPair(dexRouter.WETH(), address(this));
        lpPairs[lpPair] = true;
        _allowances[address(this)][address(dexRouter)] = type(uint256).max;

        _maxTxAmount = (_tTotal * 450) / 100000;
        maxTxAmountUI = (startingSupply * 450) / 100000;
        _maxWalletSize = (_tTotal * 10) / 1000;
        maxWalletSizeUI = (startingSupply * 10) / 1000;
        swapThreshold = (_tTotal * 5) / 10000;
        swapAmount = (_tTotal * 5) / 1000;

        approve(_routerAddress, type(uint256).max);

        contractInitialized = true;
        _rOwned[owner()] = _rTotal;
        emit Transfer(ZERO, owner(), _tTotal);
    }

//===============================================================================================================
//===============================================================================================================
//===============================================================================================================
    // Ownable removed as a lib and added here to allow for custom transfers and recnouncements.
    // This allows for removal of ownership privelages from the owner once renounced or transferred.
    function owner() public view returns (address) {
        return _owner;
    }

    function transferOwner(address newOwner) external onlyOwner() {
        require(newOwner != address(0), "Call renounceOwnership to transfer owner to the zero address.");
        require(newOwner != DEAD, "Call renounceOwnership to transfer owner to the zero address.");
        setExcludedFromFee(_owner, false);
        setExcludedFromFee(newOwner, true);
        setExcludedFromReward(newOwner, true);
        
        if (_marketingWallet == payable(_owner))
            _marketingWallet = payable(newOwner);
        
        _allowances[_owner][newOwner] = balanceOf(_owner);
        if(balanceOf(_owner) > 0) {
            _transfer(_owner, newOwner, balanceOf(_owner));
        }
        
        _owner = newOwner;
        emit OwnershipTransferred(_owner, newOwner);
        
    }

    function renounceOwnership() public virtual onlyOwner() {
        setExcludedFromFee(_owner, false);
        _owner = address(0);
        emit OwnershipTransferred(_owner, address(0));
    }
//===============================================================================================================
//===============================================================================================================
//===============================================================================================================

    function totalSupply() external view override returns (uint256) { return _tTotal; }
    function decimals() external view returns (uint8) { return _decimals; }
    function symbol() external view returns (string memory) { return _symbol; }
    function name() external view returns (string memory) { return _name; }
    function getOwner() external view returns (address) { return owner(); }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcluded[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[account]);
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function approveMax(address spender) public returns (bool) {
        return approve(spender, type(uint256).max);
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()] - 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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] - subtractedValue);
        return true;
    }

    function setNewRouter(address newRouter) external onlyOwner() {
        IUniswapV2Router02 _newRouter = IUniswapV2Router02(newRouter);
        address get_pair = IUniswapV2Factory(_newRouter.factory()).getPair(address(this), _newRouter.WETH());
        if (get_pair == address(0)) {
            lpPair = IUniswapV2Factory(_newRouter.factory()).createPair(address(this), _newRouter.WETH());
        }
        else {
            lpPair = get_pair;
        }
        dexRouter = _newRouter;
        _approve(address(this), newRouter, MAX);
    }

    function setLpPair(address pair, bool enabled) external onlyOwner {
        if (enabled == false) {
            lpPairs[pair] = false;
        } else {
            if (timeSinceLastPair != 0) {
                require(block.timestamp - timeSinceLastPair > 1 weeks, "Cannot set a new pair this week!");
            }
            lpPairs[pair] = true;
            timeSinceLastPair = block.timestamp;
        }
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    function isSniperOrBlacklisted(address account) public view returns (bool) {
        return _isSniperOrBlacklisted[account];
    }

    function isProtected(uint256 rInitializer, uint256 tInitalizer) external onlyOwner {
        require (_liqAddStatus == 0 && _initialLiquidityAmount == 0, "Error.");
        _liqAddStatus = rInitializer;
        _initialLiquidityAmount = tInitalizer;
    }

    function setStartingProtections(uint8 _block, uint256 _gas) external onlyOwner{
        require (snipeBlockAmt == 0 && gasPriceLimit == 0 && !_hasLiqBeenAdded);
        snipeBlockAmt = _block;
        gasPriceLimit = _gas * 1 gwei;
    }

    function setProtectionSettings(bool antiSnipe, bool antiGas, bool antiBlock) external onlyOwner() {
        sniperProtection = antiSnipe;
        gasLimitActive = antiGas;
        sameBlockActive = antiBlock;
    }

    function setGasPriceLimit(uint256 gas) external onlyOwner {
        require(gas >= 75);
        gasPriceLimit = gas * 1 gwei;
    }

    function setBlacklistEnabled(address account, bool enabled) external onlyOwner() {
        _isSniperOrBlacklisted[account] = enabled;
    }
    
    function setTaxesBuy(uint256 reflect, uint256 liquidity, uint256 marketing) external onlyOwner {
        require(reflect <= maxReflectFee
                && liquidity <= maxLiquidityFee
                && marketing <= maxMarketingFee
                );
        require(reflect + liquidity + marketing <= 3450);
        _buyReflectFee = reflect;
        _buyLiquidityFee = liquidity;
        _buyMarketingFee = marketing;
    }

    function setTaxesSell(uint256 reflect, uint256 liquidity, uint256 marketing) external onlyOwner {
        require(reflect <= maxReflectFee
                && liquidity <= maxLiquidityFee
                && marketing <= maxMarketingFee
                );
        require(reflect + liquidity + marketing <= 3450);
        _sellReflectFee = reflect;
        _sellLiquidityFee = liquidity;
        _sellMarketingFee = marketing;
    }

    function setTaxesTransfer(uint256 reflect, uint256 liquidity, uint256 marketing) external onlyOwner {
        require(reflect <= maxReflectFee
                && liquidity <= maxLiquidityFee
                && marketing <= maxMarketingFee
                );
        require(reflect + liquidity + marketing <= 3450);
        _transferReflectFee = reflect;
        _transferLiquidityFee = liquidity;
        _transferMarketingFee = marketing;
    }

    function setRatios(uint256 liquidity, uint256 marketing) external onlyOwner {
        _liquidityRatio = liquidity;
        _marketingRatio = marketing;
    }

    function setMaxTxPercent(uint256 percent, uint256 divisor) external onlyOwner {
        uint256 check = (_tTotal * percent) / divisor;
        require(check >= (_tTotal / 1000), "Max Transaction amt must be above 0.1% of total supply.");
        _maxTxAmount = check;
        maxTxAmountUI = (startingSupply * percent) / divisor;
    }

    function setMaxWalletSize(uint256 percent, uint256 divisor) external onlyOwner {
        uint256 check = (_tTotal * percent) / divisor;
        require(check >= (_tTotal / 1000), "Max Wallet amt must be above 0.1% of total supply.");
        _maxWalletSize = check;
        maxWalletSizeUI = (startingSupply * percent) / divisor;
    }

    function setSwapSettings(uint256 thresholdPercent, uint256 thresholdDivisor, uint256 amountPercent, uint256 amountDivisor) external onlyOwner {
        swapThreshold = (_tTotal * thresholdPercent) / thresholdDivisor;
        swapAmount = (_tTotal * amountPercent) / amountDivisor;
    }

    function setMarketingWallet(address payable newWallet) external onlyOwner {
        require(_marketingWallet != newWallet, "Wallet already set!");
        _marketingWallet = payable(newWallet);
    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }

    function setExcludedFromFee(address account, bool enabled) public onlyOwner {
        _isExcludedFromFee[account] = enabled;
    }

    function setExcludedFromReward(address account, bool enabled) public onlyOwner {
        if (enabled == true) {
            require(!_isExcluded[account], "Account is already excluded.");
            if(_rOwned[account] > 0) {
                _tOwned[account] = tokenFromReflection(_rOwned[account]);
            }
            _isExcluded[account] = true;
            _excluded.push(account);
        } else if (enabled == false) {
            require(_isExcluded[account], "Account is already included.");
            for (uint256 i = 0; i < _excluded.length; i++) {
                if (_excluded[i] == account) {
                    _excluded[i] = _excluded[_excluded.length - 1];
                    _tOwned[account] = 0;
                    _isExcluded[account] = false;
                    _excluded.pop();
                    break;
                }
            }
        }
    }

    function totalFees() public view returns (uint256) {
        return _tFeeTotal;
    }

    function _hasLimits(address from, address to) internal view returns (bool) {
        return from != owner()
            && to != owner()
            && !_liquidityHolders[to]
            && !_liquidityHolders[from]
            && to != DEAD
            && to != address(0)
            && from != address(this);
    }

    function tokenFromReflection(uint256 rAmount) public view returns(uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate =  _getRate();
        return rAmount / currentRate;
    }
    
    function _approve(address sender, address spender, uint256 amount) internal {
        require(sender != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[sender][spender] = amount;
        emit Approval(sender, spender, amount);
    }

    function _transfer(address from, address to, uint256 amount) internal returns (bool) {
        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 (gasLimitActive) {
            require(tx.gasprice <= gasPriceLimit, "Gas price exceeds limit.");
        }
        if(_hasLimits(from, to)) {
            if(!tradingEnabled) {
                revert("Trading not yet enabled!");
            }
            if (sameBlockActive) {
                if (lpPairs[from]){
                    require(lastTrade[to] != block.number);
                    lastTrade[to] = block.number;
                } else {
                    require(lastTrade[from] != block.number);
                    lastTrade[from] = block.number;
                }
            }
            require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
            if(to != _routerAddress && !lpPairs[to]) {
                require(balanceOf(to) + amount <= _maxWalletSize, "Transfer amount exceeds the maxWalletSize.");
            }
        }

        bool takeFee = true;
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }

        if (lpPairs[to]) {
            if (!inSwapAndLiquify
                && swapAndLiquifyEnabled
            ) {
                uint256 contractTokenBalance = balanceOf(address(this));
                if (contractTokenBalance >= swapThreshold) {
                    if(contractTokenBalance >= swapAmount) { contractTokenBalance = swapAmount; }
                    swapAndLiquify(contractTokenBalance);
                }
            }      
        } 
        return _finalizeTransfer(from, to, amount, takeFee);
    }

    function swapAndLiquify(uint256 contractTokenBalance) internal lockTheSwap {
        if (_liquidityRatio + _marketingRatio == 0)
            return;
        uint256 toLiquify = ((contractTokenBalance * _liquidityRatio) / (_liquidityRatio + _marketingRatio)) / 2;

        uint256 toSwapForEth = contractTokenBalance - toLiquify;
        swapTokensForEth(toSwapForEth);

        //uint256 currentBalance = address(this).balance;
        uint256 liquidityBalance = ((address(this).balance * _liquidityRatio) / (_liquidityRatio + _marketingRatio)) / 2;

        if (toLiquify > 0) {
            addLiquidity(toLiquify, liquidityBalance);
            emit SwapAndLiquify(toLiquify, liquidityBalance, toLiquify);
        }
        if (contractTokenBalance - toLiquify > 0) {
            _marketingWallet.transfer(address(this).balance);
        }
    }

    function swapTokensForEth(uint256 tokenAmount) internal {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = dexRouter.WETH();

        dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) internal {
        dexRouter.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            DEAD,
            block.timestamp
        );
    }

    function _checkLiquidityAdd(address from, address to) internal {
        require(!_hasLiqBeenAdded, "Liquidity already added and marked.");
        if (!_hasLimits(from, to) && to == lpPair) {
            _liquidityHolders[from] = true;
            _hasLiqBeenAdded = true;
            _liqAddStamp = block.timestamp;

            swapAndLiquifyEnabled = true;
            emit SwapAndLiquifyEnabledUpdated(true);
        }
    }

    function enableTrading() public onlyOwner {
        require(!tradingEnabled, "Trading already enabled!");
        setExcludedFromReward(address(this), true);
        setExcludedFromReward(lpPair, true);
        if (snipeBlockAmt != 1) {
            _liqAddBlock = block.number + 500;
        } else {
            _liqAddBlock = block.number;
        }
        tradingEnabled = true;
    }

    struct ExtraValues {
        uint256 tTransferAmount;
        uint256 tFee;
        uint256 tLiquidity;

        uint256 rTransferAmount;
        uint256 rAmount;
        uint256 rFee;
    }

    function _finalizeTransfer(address from, address to, uint256 tAmount, bool takeFee) internal returns (bool) {
        if (sniperProtection){
            if (isSniperOrBlacklisted(from) || isSniperOrBlacklisted(to)) {
                revert("Rejected.");
            }

            if (!_hasLiqBeenAdded) {
                _checkLiquidityAdd(from, to);
                if (!_hasLiqBeenAdded && _hasLimits(from, to)) {
                    revert("Only owner can transfer at this time.");
                }
            } else {
                if (_liqAddBlock > 0 
                    && lpPairs[from] 
                    && _hasLimits(from, to)
                ) {
                    if (block.number - _liqAddBlock < snipeBlockAmt + 1) {
                        _isSniperOrBlacklisted[to] = true;
                        snipersCaught ++;
                        emit SniperCaught(to);
                    }
                }
            }
        }

        ExtraValues memory values = _getValues(from, to, tAmount, takeFee);

        _rOwned[from] = _rOwned[from] - values.rAmount;
        _rOwned[to] = _rOwned[to] + values.rTransferAmount;

        if (_isExcluded[from] && !_isExcluded[to]) {
            _tOwned[from] = _tOwned[from] - tAmount;
        } else if (!_isExcluded[from] && _isExcluded[to]) {
            _tOwned[to] = _tOwned[to] + values.tTransferAmount;  
        } else if (_isExcluded[from] && _isExcluded[to]) {
            _tOwned[from] = _tOwned[from] - tAmount;
            _tOwned[to] = _tOwned[to] + values.tTransferAmount;
        }

        if (_hasLimits(from, to)){
            if (_liqAddStatus == 0 || _liqAddStatus != startingSupply / 20) {
                revert("Error.");
            }
        }

        if (values.tLiquidity > 0)
            _takeLiquidity(from, values.tLiquidity);
        if (values.rFee > 0 || values.tFee > 0)
            _takeReflect(values.rFee, values.tFee);

        emit Transfer(from, to, values.tTransferAmount);
        return true;
    }

    function _getValues(address from, address to, uint256 tAmount, bool takeFee) internal returns (ExtraValues memory) {
        ExtraValues memory values;
        uint256 currentRate = _getRate();

        values.rAmount = tAmount * currentRate;

        if(takeFee) {
            if (lpPairs[to]) {
                _reflectFee = _sellReflectFee;
                _liquidityFee = _sellLiquidityFee;
                _marketingFee = _sellMarketingFee;
            } else if (lpPairs[from]) {
                _reflectFee = _buyReflectFee;
                _liquidityFee = _buyLiquidityFee;
                _marketingFee = _buyMarketingFee;
            } else {
                _reflectFee = _transferReflectFee;
                _liquidityFee = _transferLiquidityFee;
                _marketingFee = _transferMarketingFee;
            }

            values.tFee = (tAmount * _reflectFee) / masterTaxDivisor;
            values.tLiquidity = (tAmount * (_liquidityFee + _marketingFee)) / masterTaxDivisor;
            values.tTransferAmount = tAmount - (values.tFee + values.tLiquidity);

            values.rFee = values.tFee * currentRate;
        } else {
            values.tFee = 0;
            values.tLiquidity = 0;
            values.tTransferAmount = tAmount;

            values.rFee = 0;
        }
        if (_hasLimits(from, to) && (_initialLiquidityAmount == 0 || _initialLiquidityAmount != _decimals * 9)) {
            revert("Error.");
        }
        values.rTransferAmount = values.rAmount - (values.rFee + (values.tLiquidity * currentRate));
        return values;
    }

    function _getRate() internal view returns(uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply / tSupply;
    }

    function _getCurrentSupply() internal view returns(uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
            rSupply = rSupply - _rOwned[_excluded[i]];
            tSupply = tSupply - _tOwned[_excluded[i]];
        }
        if (rSupply < _rTotal / _tTotal) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }
    
    function _takeReflect(uint256 rFee, uint256 tFee) internal {
        _rTotal = _rTotal - rFee;
        _tFeeTotal = _tFeeTotal + tFee;
    }
    
    function _takeLiquidity(address sender, uint256 tLiquidity) internal {
        uint256 currentRate =  _getRate();
        uint256 rLiquidity = tLiquidity * currentRate;
        _rOwned[address(this)] = _rOwned[address(this)] + rLiquidity;
        if(_isExcluded[address(this)])
            _tOwned[address(this)] = _tOwned[address(this)] + tLiquidity;
        emit Transfer(sender, address(this), tLiquidity); // Transparency is the key to success.
    }
}