// Contract: DuangCoin
// Target function: function rescueAnyBEP20Tokens(address _tokenAddr, address _to, uint _amount) public onlyOwner
256 rRfi;
      uint256 rMarketing;
      uint256 rDev;
      uint256 rLiquidity;
      uint256 tTransferAmount;
      uint256 tRfi;
      uint256 tMarketing;
      uint256 tDev;
      uint256 tLiquidity;
    }

    event FeesChanged();

    modifier lockTheSwap {
        swapping = true;
        _;
        swapping = false;
    }

    constructor () {
        IRouter _router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        address _pair = IFactory(_router.factory())
            .createPair(address(this), _router.WETH());

        router = _router;
        pair = _pair;
        
        excludeFromReward(pair);

        _rOwned[owner()] = _rTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[marketingAddress]=true;
        _isExcludedFromFee[devAddress] = true;

        emit Transfer(address(0), owner(), _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 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 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 virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function reflectionFromToken(uint256 tAmount, bool deductTransferRfi, bool isSell) public view returns(uint256) {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferRfi) {
            valuesFromGetValues memory s = _getValues(tAmount, false, isSell);
            return s.rAmount;
        } else {
            valuesFromGetValues memory s = _getValues(tAmount, true, isSell);
            return s.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 not excluded");
        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 excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }

    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }


    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    function setTaxes(uint256 _rfi, uint256 _marketing, uint256 _dev, uint256 _liquidity) public onlyOwner {
        taxes.rfi = _rfi;
        taxes.marketing = _marketing;
        taxes.dev = _dev;
        taxes.liquidity = _liquidity;
        emit FeesChanged();
    }
    
    function setSellTaxes(uint256 _rfi, uint256 _marketing, uint256 _dev, uint256 _liquidity) public onlyOwner {
        sellTaxes.rfi = _rfi;
        sellTaxes.marketing = _marketing;
        sellTaxes.dev = _dev;
        sellTaxes.liquidity = _liquidity;
        emit FeesChanged();
    }

    function _reflectRfi(uint256 rRfi, uint256 tRfi) private {
        _rTotal -=rRfi;
        totFeesPaid.rfi +=tRfi;
    }

    function _takeLiquidity(uint256 rLiquidity, uint256 tLiquidity) private {
        totFeesPaid.liquidity +=tLiquidity;

        if(_isExcluded[address(this)])
        {
            _tOwned[address(this)]+=tLiquidity;
        }
        _rOwned[address(this)] +=rLiquidity;
    }

    function _takeMarketing(uint256 rMarketing, uint256 tMarketing) private {
        totFeesPaid.marketing +=tMarketing;

        if(_isExcluded[address(this)])
        {
            _tOwned[address(this)]+=tMarketing;
        }
        _rOwned[address(this)] +=rMarketing;
    }
    
    function _takeDev(uint256 rDev, uint256 tDev) private {
        totFeesPaid.dev += tDev;

        if(_isExcluded[address(this)])
        {
            _tOwned[address(this)]+= tDev;
        }
        _rOwned[address(this)] += rDev;
    }

    function _getValues(uint256 tAmount, bool takeFee, bool isSell) private view returns (valuesFromGetValues memory to_return) {
        to_return = _getTValues(tAmount, takeFee, isSell);
        (to_return.rAmount, to_return.rTransferAmount, to_return.rRfi, to_return.rMarketing, to_return.rDev, to_return.rLiquidity) = _getRValues(to_return, tAmount, takeFee, _getRate());
        return to_return;
    }

    function _getTValues(uint256 tAmount, bool takeFee, bool isSell) private view returns (valuesFromGetValues memory s) {

        if(!takeFee) {
          s.tTransferAmount = tAmount;
          return s;
        }
        Taxes memory temp;
        if(isSell) temp = sellTaxes;
        else temp = taxes;
        
        s.tRfi = tAmount*temp.rfi/100;
        s.tMarketing = tAmount*temp.marketing/100;
        s.tLiquidity = tAmount*temp.liquidity/100;
        s.tDev = tAmount*temp.dev/100;
        s.tTransferAmount = tAmount-s.tRfi-s.tMarketing-s.tDev-s.tLiquidity;
        return s;
    }

    function _getRValues(valuesFromGetValues memory s, uint256 tAmount, bool takeFee, uint256 currentRate) private pure returns (uint256 rAmount, uint256 rTransferAmount, uint256 rRfi,uint256 rMarketing, uint256 rDev, uint256 rLiquidity) {
        rAmount = tAmount*currentRate;

        if(!takeFee) {
          return(rAmount, rAmount, 0,0,0,0);
        }

        rRfi = s.tRfi*currentRate;
        rMarketing = s.tMarketing*currentRate;
        rDev = s.tDev*currentRate;
        rLiquidity = s.tLiquidity*currentRate;
        rTransferAmount =  rAmount-rRfi-rMarketing-rDev-rLiquidity;
        return (rAmount, rTransferAmount, rRfi,rMarketing,rDev,rLiquidity);
    }

    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 _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");
        require(amount <= balanceOf(from),"You are trying to transfer more than your balance");
        require(!_isBot[from] && !_isBot[to], "You are a bot");
                
        if(!_isExcludedFromFee[from] && !_isExcludedFromFee[to] && !swapping){
            if(from == pair){
                require(amount <= maxBuyAmount, "You are exceeding maxBuyAmount");
            }
            if(to == pair){
                require(amount <= maxSellAmount, "You are exceeding maxSellAmount");
            }
            if(to != pair){
                require(balanceOf(to) + amount <= maxWalletBalance, "You are exceeding maxWalletBalance");
            }
        }
        
        bool canSwap = balanceOf(address(this)) >= swapTokensAtAmount;
        if(!swapping && swapEnabled && canSwap && from != pair && !_isExcludedFromFee[from] && !_isExcludedFromFee[to]){
            swapAndLiquify(swapTokensAtAmount);
        }

        _tokenTransfer(from, to, amount, !(_isExcludedFromFee[from] || _isExcludedFromFee[to]), to == pair);
    }


    //this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(address sender, address recipient, uint256 tAmount, bool takeFee, bool isSell) private {
        valuesFromGetValues memory s = _getValues(tAmount, takeFee, isSell);

        if (_isExcluded[sender] ) {  //from excluded
                _tOwned[sender] = _tOwned[sender]-tAmount;
        }
        if (_isExcluded[recipient]) { //to excluded
                _tOwned[recipient] = _tOwned[recipient]+s.tTransferAmount;
        }

        _rOwned[sender] = _rOwned[sender]-s.rAmount;
        _rOwned[recipient] = _rOwned[recipient]+s.rTransferAmount;
        
        if(s.rRfi > 0 || s.tRfi > 0) _reflectRfi(s.rRfi, s.tRfi);
        if(s.rLiquidity > 0 || s.tLiquidity > 0) {
            _takeLiquidity(s.rLiquidity,s.tLiquidity);
        }
        if(s.rMarketing > 0 || s.tMarketing > 0){
            _takeMarketing(s.rMarketing, s.tMarketing);
        }
        if(s.rDev > 0 || s.tDev > 0){
            _takeDev(s.rDev, s.tDev);
        }
        
        emit Transfer(sender, recipient, s.tTransferAmount);
        emit Transfer(sender, address(this), s.tLiquidity + s.tDev + s.tMarketing);
        
    }

    function swapAndLiquify(uint256 tokens) private lockTheSwap{
       // Split the contract balance into halves
        uint256 denominator = (sellTaxes.liquidity + sellTaxes.marketing + sellTaxes.dev) * 2;
        uint256 tokensToAddLiquidityWith = tokens * sellTaxes.liquidity / denominator;
        uint256 toSwap = tokens - tokensToAddLiquidityWith;

        uint256 initialBalance = address(this).balance;

        swapTokensForBNB(toSwap);

        uint256 deltaBalance = address(this).balance - initialBalance;
        uint256 unitBalance= deltaBalance / (denominator - sellTaxes.liquidity);
        uint256 bnbToAddLiquidityWith = unitBalance * sellTaxes.liquidity;

        if(bnbToAddLiquidityWith > 0){
            // Add liquidity to pancake
            addLiquidity(tokensToAddLiquidityWith, bnbToAddLiquidityWith);
        }

        uint256 marketingAmt = unitBalance * 2 * sellTaxes.marketing;
        if(marketingAmt > 0){
            payable(marketingAddress).transfer(marketingAmt);
        }
        
        uint256 devAmt = unitBalance * 2 * sellTaxes.dev;
        if(devAmt > 0){
            payable(devAddress).transfer(devAmt);
        }
    }

    function addLiquidity(uint256 tokenAmount, uint256 bnbAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(router), tokenAmount);

        // add the liquidity
        router.addLiquidityETH{value: bnbAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            address(0),
            block.timestamp
        );
    }

    function swapTokensForBNB(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        _approve(address(this), address(router), tokenAmount);

        // make the swap
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function updateMarketingWallet(address newWallet) external onlyOwner{
        marketingAddress = newWallet;
    }
    
    function updateDevWallet(address newDevWallet) external onlyOwner{
        devAddress = newDevWallet;
    }
    
    function updateMaxWalletBalance(uint256 amount) external onlyOwner{
        maxWalletBalance = amount * 10**_decimals;
    }

    function updatMaxBuyAmt(uint256 amount) external onlyOwner{
        maxBuyAmount = amount * 10**_decimals;
    }
    
    function updatMaxSellAmt(uint256 amount) external onlyOwner{
        maxSellAmount = amount * 10**_decimals;
    }
    
    function updateSwapTokensAtAmount(uint256 amount) external onlyOwner{
        swapTokensAtAmount = amount * 10**_decimals;
    }

    function updateSwapEnabled(bool _enabled) external onlyOwner{
        swapEnabled = _enabled;
    }

    function setAntibot(address account, bool state) external onlyOwner{
        require(_isBot[account] != state, 'Value already set');
        _isBot[account] = state;
    }
    
    function bulkAntiBot(address[] memory accounts, bool state) external onlyOwner{
        for(uint256 i = 0; i < accounts.length; i++){
            _isBot[accounts[i]] = state;
        }
    }
    
    function updateRouterAndPair(address newRouter, address newPair) external onlyOwner{
        // Thanks you Freezy (https://t.me/FreezyDev)
        router = IRouter(newRouter);
        pair = newPair;
    }
    
    function isBot(address account) public view returns(bool){
        return _isBot[account];
    }
    

    //Use this in case BNB are sent to the contract by mistake
    function rescueBNB(uint256 weiAmount) external onlyOwner{
        require(address(this).balance >= weiAmount, "insufficient BNB balance");
        payable(msg.sender).transfer(weiAmount);
    }