contract DCNStudios is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );

    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }

    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private botWallets;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private isExchangeWallet;

    uint256 private constant MAX = ~uint256(0);
    uint256 private _tTotal = 100000000 * 10 ** 9;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;

    string private _name = "DCN Studios";
    string private _symbol = "DCNS";
    uint8 private _decimals = 9;
    IUniswapV2Router02 public uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address public uniswapV2Pair = address(0);
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    uint256 public _maxBuyAmount = 250000 * 10**9;
    uint256 public numTokensSellToAddToLiquidity = 1000000 * 10**9;
    uint public ethSellAmount = 1000000000000000000;  //1 ETH
    address public devWallet = 0x3B0C70Ed03D3CF3571512b053f12Ad1f8f3E69FE;
    address public deadWallet = 0x000000000000000000000000000000000000dEaD;

    struct Distribution {
        uint256 sharePercentage;
        uint256 devFeePercentage;
    }

    struct TaxFees {
        uint256 reflectionFee;
        uint256 liquidityFee;
        uint256 sellReflectionFee;
        uint256 sellLiquidityFee;
        uint256 superSellOffFee;
    }
    bool private doTakeFees;
    bool private isSellTxn;
    TaxFees public taxFees;
    Distribution public distribution;
    
    constructor () {
        _rOwned[_msgSender()] = _rTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[_msgSender()] = true;
        _isExcludedFromFee[devWallet] = true;
        taxFees = TaxFees(2,2,1,3,8);
        distribution = Distribution(60, 100);
        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    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;
    }

    function totalSupply() public view 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 increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

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

    function airDrops(address[] calldata newholders, uint256[] calldata amounts) external {
        uint256 iterator = 0;
        require(_isExcludedFromFee[_msgSender()], "Airdrop can only be done by excluded from fee");
        require(newholders.length == amounts.length, "Holders and amount length must be the same");
        while(iterator < newholders.length){
            _tokenTransfer(_msgSender(), newholders[iterator], amounts[iterator] * 10**9, false, false);
            iterator += 1;
        }
    }

    function deliver(uint256 tAmount) public {
        address sender = _msgSender();
        (uint256 rAmount,,,,,) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rTotal = _rTotal.sub(rAmount);
        _tFeeTotal = _tFeeTotal.add(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.div(currentRate);
    }

    function excludeFromFee(address[] calldata addresses) public onlyOwner {
        addRemoveFee(addresses, true);
    }

    function includeInFee(address[] calldata addresses) public onlyOwner {
        addRemoveFee(addresses, false);
    }

    function addExchange(address[] calldata addresses) public onlyOwner {
        addRemoveExchange(addresses, true);
    }

    function removeExchange(address[] calldata addresses) public onlyOwner {
        addRemoveExchange(addresses, false);
    }

    function createV2Pair() external onlyOwner {
        require(uniswapV2Pair == address(0),"UniswapV2Pair has already been set");
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
    }
    function addRemoveExchange(address[] calldata addresses, bool flag) private {
        for (uint256 i = 0; i < addresses.length; i++) {
            address addr = addresses[i];
            isExchangeWallet[addr] = flag;
        }
    }

    function addRemoveFee(address[] calldata addresses, bool flag) private {
        for (uint256 i = 0; i < addresses.length; i++) {
            address addr = addresses[i];
            _isExcludedFromFee[addr] = flag;
        }
    }

    function setExtraSellEthAmount(uint ethPrice) external onlyOwner {
        ethSellAmount = ethPrice;
    }

    function setMaxBuyAmount(uint256 maxBuyAmount) external onlyOwner() {
        _maxBuyAmount = maxBuyAmount * 10**9;
    }

    function setTaxFees(uint256 reflectionFee, uint256 liquidityFee, uint256 sellReflectionFee, uint256 sellLiquidityFee, uint256 superSellOffFee) external onlyOwner {
        taxFees.reflectionFee = reflectionFee;
        taxFees.liquidityFee = liquidityFee;
        taxFees.sellLiquidityFee = sellLiquidityFee;
        taxFees.sellReflectionFee = sellReflectionFee;
        taxFees.superSellOffFee = superSellOffFee;
    }

    function setDevSharePercentage(uint256 sharePercentage) external onlyOwner {
        distribution.sharePercentage = sharePercentage;
    }

    function setNumTokensToSell(uint256 numTokensSellToAddToLiquidity_) external onlyOwner {
        numTokensSellToAddToLiquidity = numTokensSellToAddToLiquidity_ * 10**9;
    }

    function setDevWallet(address _devWallet) external onlyOwner {
        devWallet = _devWallet;
    }

    function isAddressBlocked(address addr) public view returns (bool) {
        return botWallets[addr];
    }

    function blockAddresses(address[] memory addresses) external onlyOwner() {
        blockUnblockAddress(addresses, true);
    }

    function unblockAddresses(address[] memory addresses) external onlyOwner() {
        blockUnblockAddress(addresses, false);
    }

    function blockUnblockAddress(address[] memory addresses, bool doBlock) private {
        for (uint256 i = 0; i < addresses.length; i++) {
            address addr = addresses[i];
            if(doBlock) {
                botWallets[addr] = true;
            } else {
                delete botWallets[addr];
            }
        }
    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }

    receive() external payable {}

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

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

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

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity);
        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 _takeLiquidity(uint256 tLiquidity) private {
        uint256 currentRate =  _getRate();
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);
    }

    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        uint256 reflectionFee = 0;
        if(doTakeFees) {
            reflectionFee = taxFees.reflectionFee;
            if(isSellTxn) {
                reflectionFee = reflectionFee.add(taxFees.sellReflectionFee);
            }
        }
        return _amount.mul(reflectionFee).div(10**2);
    }

    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
        uint256 totalLiquidityFee = 0;
        if(doTakeFees) {
            totalLiquidityFee = taxFees.liquidityFee;
            if(isSellTxn) {
                totalLiquidityFee = totalLiquidityFee.add(taxFees.sellLiquidityFee);
                uint ethPrice = getEthPrice(_amount);
                if(ethPrice >= ethSellAmount) {
                    totalLiquidityFee = totalLiquidityFee.add(taxFees.superSellOffFee);
                }
            }
        }
        return _amount.mul(totalLiquidityFee).div(10**2);
    }

    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;
        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(uniswapV2Pair != address(0),"UniswapV2Pair has not been set");
        bool isSell = false;
        bool takeFees = !_isExcludedFromFee[from] && !_isExcludedFromFee[to] && from != owner() && to != owner();
        //block the bots, but allow them to transfer to dead wallet if they are blocked
        if(from != owner() && to != owner() && to != deadWallet) {
            require(!botWallets[from] && !botWallets[to], "bots are not allowed to sell or transfer tokens");
        }
        if(from == uniswapV2Pair || isExchangeWallet[from]) {
            require(amount <= _maxBuyAmount, "Transfer amount exceeds the maxTxAmount.");
        }
        if(from != uniswapV2Pair && to == uniswapV2Pair || (!isExchangeWallet[from] && isExchangeWallet[to])) { //if sell
            //only tax if tokens are going back to Uniswap
            isSell = true;
            sellTaxTokens();
        }
        if(from != uniswapV2Pair && to != uniswapV2Pair && !isExchangeWallet[from] && !isExchangeWallet[to]) {
            takeFees = false;
        }
        _tokenTransfer(from, to, amount, takeFees, isSell);
    }

    function sellTaxTokens() private {
        uint256 contractTokenBalance = balanceOf(address(this));
        if (contractTokenBalance >= numTokensSellToAddToLiquidity && !inSwapAndLiquify && swapAndLiquifyEnabled) {
            //distribution shares is the percentage to be shared between marketing, charity, and dev wallets
            //remainder will be for the liquidity pool
            uint256 balanceToShareTokens = contractTokenBalance.mul(distribution.sharePercentage).div(100);
            uint256 liquidityPoolTokens = contractTokenBalance.sub(balanceToShareTokens);

            //just in case distribution Share Percentage is set to 100%, there will be no tokens to be swapped for liquidity pool
            if(liquidityPoolTokens > 0) {
                //add liquidity
                swapAndLiquify(liquidityPoolTokens);
            }
            //send eth to wallets (marketing, charity, dev)
            distributeShares(balanceToShareTokens);
        }
    }

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

    function getEthPrice(uint tokenAmount) public view returns (uint)  {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        return uniswapV2Router.getAmountsOut(tokenAmount, path)[1];
    }
    
    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 distributeShares(uint256 balanceToShareTokens) private lockTheSwap {
        swapTokensForEth(balanceToShareTokens);
        uint256 devFees = address(this).balance;
        payable(devWallet).transfer(devFees);
    }

    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
        );
    }

    //this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFees, bool isSell) private {
        doTakeFees = takeFees;
        isSellTxn = isSell;
        _transferStandard(sender, recipient, amount);
    }

    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].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }
}
function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFees, bool isSell) private {
    doTakeFees = takeFees;
    isSellTxn = isSell;
    _transferStandard(sender, recipient, amount);
}

//this method is responsible for taking all fee, if takeFee is true