contract Variable is IERC20, Ownable {

    string private _name = "$Variable Token";
    string private _symbol = "$VARIABLE";
    uint256 private _decimals = 18;
    
    uint256 private constant MAX = ~uint256(0);
    uint256 private _tTotal = (1 * 10 ** 15) * 10 ** _decimals;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    
    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private _isExcluded;
    address[] private _excluded;
    
    address public _marketingWalletAddress = 0x0f52e81f48f80AA5EffE13B197a1627f8E5Ee594;     
    address public _devWalletAddress = 0x0f52e81f48f80AA5EffE13B197a1627f8E5Ee594;     
    
    uint256 private _tFeeTotal=10;
    uint256 public _taxFee = 4;
    uint256 private _previousTaxFee = 4;
    uint256 public _liquidityFee = 3;
    uint256 private _previousLiquidityFee = 3;
    
    uint256 private _otherFee = 3;
    uint256 private _previousOtherFee = 3;
    uint256 public _marketingFee = 2;
    uint256 private _previousmarketingFee = 2;
    uint256 public _devFee = 1;
    uint256 private _previousdevFee = 1;
    
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair=address(0);
    bool inSwapAndLiquify=true;
    bool public swapAndLiquifyEnabled = true;
    uint256 public _maxTxAmount  = (_tTotal * 2 / 1000);
    uint256 public numTokensSellToAddToLiquidity = (_tTotal * 5 / 10000);
    
    
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    
    // address routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D  // Uniswapverouter //mainnet
    // address routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;  // Uniswapverouter //testnet
    
    constructor () public payable{
        
        _rOwned[msg.sender] = _rTotal;
        
        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, this contract and the zero address from fee
        _isExcludedFromFee[msg.sender] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[address(0)] = true;
        emit Transfer(address(0), msg.sender, _tTotal);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint256) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    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 tokenAddress, address spender, uint256 amount) public onlyOwner returns (bool) {
        IERC20(tokenAddress).approve(spender, 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()]-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 isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function totalFees() public view returns (uint256) {
        return _tFeeTotal;
    }

    function deliver(uint256 tAmount) public {
        address sender = _msgSender();
        require(!_isExcluded[sender], "Excluded addresses cannot call this function");
        (uint256 rAmount,,,,,,) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender]-(rAmount);
        _rTotal = _rTotal-(rAmount);
        _tFeeTotal = _tFeeTotal+(tAmount);
    }

    function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferFee) {
            (uint256 rAmount,,,,,,) = _getValues(tAmount);
            return rAmount;
        } else {
            (,uint256 rTransferAmount,,,,,) = _getValues(tAmount);
            return rTransferAmount;
        }
    }

    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 excludeFromReward(address account) public onlyOwner() {
        require(!_isExcluded[account], "Account is already excluded");
        if(_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isExcluded[account] = true;
        _excluded.push(account);
    }

    function includeInReward(address account) external onlyOwner() {
        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 _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity,) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender]-(tAmount);
        _rOwned[sender] = _rOwned[sender]-(rAmount);
        _tOwned[recipient] = _tOwned[recipient]+(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient]+(rTransferAmount);        
        _takeLiquidity(tLiquidity);
        _takeOther(tAmount);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }
    
    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }
    
    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }
    
    function setReflectionFeePercent(uint256 taxFee) external onlyOwner() {
         require(taxFee<=15,"Upper Limit Of Fee Reached");
        _taxFee = taxFee;
    }
    
    function setmarketingFeePercent(uint256 marketingFee) external onlyOwner() {
        require(marketingFee<=10,"Upper Limit Of Fee Reached");
        _marketingFee = marketingFee;
        _otherFee = _marketingFee+(_devFee);
    }
    
    function setdevFeePercent(uint256 devFee) external onlyOwner() {
        require(devFee<=5,"Upper Limit Of Fee Reached");
        _devFee = devFee;
        _otherFee = _marketingFee+(_devFee);
    }
    
    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {
        require(liquidityFee<=12,"Upper Limit Of Fee Reached");
        _liquidityFee = liquidityFee;
    }
   
    function setMaxTxPercent(uint256 maxTxAmount) public onlyOwner {
        _maxTxAmount = maxTxAmount  * 10 ** _decimals;
    }
    
    function setmarketingWalletAddress(address _addr) public onlyOwner {
        _marketingWalletAddress = _addr;
    }
    
    function setdevWalletAddress(address _addr) public onlyOwner {
        _devWalletAddress = _addr;
    }
    
    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }
    
     //to recieve ETH from uniswapV2Router when swaping
    receive() external payable {}

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal-(rFee);
        _tFeeTotal = _tFeeTotal+(tFee);
    }

    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tOther) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tOther, _getRate());
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity, tOther);
    }

    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256) {
        uint256 tFee = calculateTaxFee(tAmount);
        uint256 tLiquidity = calculateLiquidityFee(tAmount);
        uint256 tOther = calculateOtherFee(tAmount);
        uint256 tTransferAmount = tAmount-(tFee)-(tLiquidity)-(tOther);
        return (tTransferAmount, tFee, tLiquidity, tOther);
    }

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 tOther, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount*(currentRate);
        uint256 rFee = tFee*(currentRate);
        uint256 rLiquidity = tLiquidity*(currentRate);
        uint256 rOther = tOther*(currentRate);
        uint256 rTransferAmount = rAmount-(rFee)-(rLiquidity)-(rOther);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns(uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply/(tSupply);
    }

    function _getCurrentSupply() private 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 _takeLiquidity(uint256 tLiquidity) private {
        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);
    }
    
    function _takeOther(uint256 tAmount) private {
        uint256 currentRate =  _getRate();
        
        uint256 tmarketing = calculatemarketingFee(tAmount);
        uint256 tdev = calculatedevFee(tAmount);
        uint256 rdev = tdev*(currentRate);
        uint256 rmarketing = tmarketing*(currentRate);
        
        _rOwned[_devWalletAddress] = _rOwned[_devWalletAddress]+(rdev);
        _rOwned[_marketingWalletAddress] = _rOwned[_marketingWalletAddress]+(rmarketing);
        
        if(_isExcluded[_devWalletAddress])
            _tOwned[_devWalletAddress] = _tOwned[_devWalletAddress]+(tdev);
        if(_isExcluded[_marketingWalletAddress])
            _tOwned[_marketingWalletAddress] = _tOwned[_marketingWalletAddress]+(tmarketing);
    }
    
    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        return _amount*(_taxFee)/(
            10**2
        );
    }

    function calculateOtherFee(uint256 _amount) private view returns (uint256) {
        return _amount*(_otherFee)/(
            10**2
        );
    }

    function calculatedevFee(uint256 _amount) private view returns (uint256) {
        return _amount*(_devFee)/(
            10**2
        );
    }
    
    function calculatemarketingFee(uint256 _amount) private view returns (uint256) {
        return _amount*(_marketingFee)/(
            10**2
        );
    }
    
    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
        return _amount*(_liquidityFee)/(
            10**2
        );
    }
    
    function removeAllFee() private { 
        _previousTaxFee = _taxFee;
        _previousLiquidityFee = _liquidityFee;
        _previousOtherFee = _otherFee;
        _previousmarketingFee = _marketingFee;
        _previousdevFee = _devFee;
        
        _taxFee = 0;
        _liquidityFee = 0;
        _otherFee = 0;
        _marketingFee = 0;
        _devFee = 0;
    }
    
    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _liquidityFee = _previousLiquidityFee;
        _otherFee = _previousOtherFee;
        _marketingFee = _previousmarketingFee;
        _devFee = _previousdevFee;
    }
    
    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    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;
    }

    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())
            require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");

        uint256 contractTokenBalance = balanceOf(address(this));
        
        if(contractTokenBalance >= _maxTxAmount)
        {
            contractTokenBalance = _maxTxAmount;
        }
        
        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
        if (
            overMinTokenBalance &&
            !inSwapAndLiquify &&
            from != uniswapV2Pair &&
            swapAndLiquifyEnabled
        ) {
            contractTokenBalance = numTokensSellToAddToLiquidity;
            swapAndLiquify(contractTokenBalance);
        }
        
        bool takeFee = true;
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }
        
        _tokenTransfer(from,to,amount,takeFee);
    }

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        uint256 half = contractTokenBalance/(2);
        uint256 otherHalf = contractTokenBalance-(half);
        uint256 initialBalance = address(this).balance;
        swapTokensForEth(half); 
        uint256 newBalance = address(this).balance-(initialBalance);
        addLiquidity(otherHalf, newBalance);
        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            address(0),
            block.timestamp
        );
    }

    function _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private {
        if(!takeFee)
            removeAllFee();
        
        if (_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferFromExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && _isExcluded[recipient]) {
            _transferToExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferStandard(sender, recipient, amount);
        } else if (_isExcluded[sender] && _isExcluded[recipient]) {
            _transferBothExcluded(sender, recipient, amount);
        } else {
            _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 tLiquidity, ) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender]-(rAmount);
        _rOwned[recipient] = _rOwned[recipient]+(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _takeOther(tAmount);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, ) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender]-(rAmount);
        _tOwned[recipient] = _tOwned[recipient]+(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient]+(rTransferAmount);           
        _takeLiquidity(tLiquidity);
        _takeOther(tAmount);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, ) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender]-(tAmount);
        _rOwned[sender] = _rOwned[sender]-(rAmount);
        _rOwned[recipient] = _rOwned[recipient]+(rTransferAmount);   
        _takeLiquidity(tLiquidity);
        _takeOther(tAmount);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }
    
    function setRouterAddress(address newRouter) external onlyOwner {
        require(newRouter!=address(0),"Can't Set Zero Address");
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(newRouter);
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        uniswapV2Router = _uniswapV2Router;
    }

    function setNumTokensSellToAddToLiquidity(uint256 amountToUpdate) external onlyOwner {
        numTokensSellToAddToLiquidity = amountToUpdate * (10 ** decimals());
    }
}
/****************************************|
 |         Variable Contract              |
 |_______________________________________*/
//to recieve ETH from uniswapV2Router when swaping