// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.8.0;

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);
}

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;
    }
}

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);
    }
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    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 ERC20 is Context, IERC20, Ownable {
    using SafeMath for uint256;
    string private constant _name = unicode"ERC20";
    string private constant _symbol = unicode"ERC20";
    uint8 private constant _decimals = 9;

    mapping(address => uint256) private _rOwned;
    mapping(address => uint256) private _tOwned;    
    uint256 private constant MAX = ~uint256(0);
    uint256 private _tTotal = 33000000000000 * 10**9;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;
    uint256 public _kyubiBurned;

    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;

    mapping(address => uint256) private buycooldown;
    mapping(address => uint256) private sellcooldown;
    mapping(address => uint256) private firstsell;
    mapping(address => uint256) private sellnumber;
    
    address private eViral = 0x7CeC018CEEF82339ee583Fd95446334f2685d24f;  //0x7CeC018CEEF82339ee583Fd95446334f2685d24f eviral //ropsten dai 0x31F42841c2db5173425b5223809CF3A38FEde360
    address private burnAddress = 0x000000000000000000000000000000000000dEaD;
    address payable private _teamAddress;
    address payable private _marketingFunds;
    address payable private _developmentFunds1;
    address payable private _developmentFunds2;
    IUniswapV2Router02 private uniswapV2Router;
    address public uniswapV2Pair;
    
    bool public tradeAllowed = false;
    bool private liquidityAdded = false;
    bool private inSwap = false;
    bool public swapEnabled = false;

    uint256 private _reflection = 5;
    uint256 private _teamFee = 7;
    uint256 private _kyubiBurn = 5;

    event MaxTxAmountUpdated(uint256 _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }
    constructor(address payable addr1, address payable addr2, address payable addr3, address payable addr4) {
        _teamAddress = addr1;
        _marketingFunds = addr2;
        _developmentFunds1 = addr3;
        _developmentFunds2 = addr4;
        _rOwned[_msgSender()] = _rTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_teamAddress] = true;
        _isExcludedFromFee[_marketingFunds] = true;
        _isExcludedFromFee[_developmentFunds1] = true;
        _isExcludedFromFee[_developmentFunds2] = true;
        emit Transfer(address(0), _msgSender(), _tTotal);
    }
    
    function addExcludedFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }
    
    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) {
        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 releaseKyubi() public onlyOwner {
        require(liquidityAdded);
        tradeAllowed = true;
    }

    function addLiquidity() external onlyOwner() {
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Router = _uniswapV2Router;
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        swapEnabled = true;
        liquidityAdded = true;
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router),type(uint256).max);
    }

    function manualswap() external onlyOwner() {
        uint256 contractBalance = balanceOf(address(this));
        swapTokensForEth(contractBalance);
    }

    function manualsend() external onlyOwner() {
        uint256 contractETHBalance = address(this).balance;
        sendETHToFee(contractETHBalance);
    }

    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 _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()) {
            
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]) {
                require(tradeAllowed);
                require(buycooldown[to] < block.timestamp);
                uint walletBalance = balanceOf(address(to));
                require(amount.add(walletBalance) <= _tTotal.div(100));
                buycooldown[to] = block.timestamp + (45 seconds);
                _teamFee = 7;
                _reflection = 3;
                _kyubiBurn = 0;
                uint contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    swapETHForEViral(address(this).balance);
                }
                
            }
            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && from != uniswapV2Pair && swapEnabled && !_isExcludedFromFee[to] && !_isExcludedFromFee[from]) {
                require(amount <= balanceOf(uniswapV2Pair).mul(33).div(1000));
                require(sellcooldown[from] < block.timestamp);
                if(firstsell[from] + (1 days) < block.timestamp){
                    sellnumber[from] = 0;
                }
                if (sellnumber[from] == 0) {
                    sellnumber[from]++;
                    firstsell[from] = block.timestamp;
                    sellcooldown[from] = block.timestamp + (1 hours);
                }
                else if (sellnumber[from] == 1) {
                    sellnumber[from]++;
                    sellcooldown[from] = block.timestamp + (3 hours);
                }
                else if (sellnumber[from] == 2) {
                    sellnumber[from]++;
                    sellcooldown[from] = firstsell[from] + (1 days);
                }
                uint initialBalance = address(this).balance;
                swapTokensForEth(contractTokenBalance);
                uint newBalance = address(this).balance;
                uint distributeETHBalance = newBalance.sub(initialBalance);
                if (distributeETHBalance > 0) {
                    sendETHToFee(distributeETHBalance);
                }
                setFee(sellnumber[from]);
            }
        }
        bool takeFee = true;
        if (_isExcludedFromFee[from] || _isExcludedFromFee[to]) {
            takeFee = false;
            if ( to != uniswapV2Pair && to!= address(uniswapV2Router)) {
                takeFee = false;
            }
        }
        _tokenTransfer(from, to, amount, takeFee);
        restoreAllFee;
    }
    

    function removeAllFee() private {
        if (_reflection == 0 && _teamFee == 0 && _kyubiBurn == 0) return;
        _reflection = 0;
        _teamFee = 0;
        _kyubiBurn = 0;
    }

    function restoreAllFee() private {
        _reflection = 5;
        _teamFee = 7;
        _kyubiBurn = 5;
    }
    
    function setFee(uint256 multiplier) private {
        _reflection = _reflection.mul(multiplier);
        _kyubiBurn = _kyubiBurn.mul(multiplier);
        _teamFee = _teamFee.add(multiplier);       
    }

    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 amount) private {
        (uint256 tAmount, uint256 tBurn) = _kyubiTokenBurn(amount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tTeam) = _getValues(tAmount, tBurn);
        _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 _kyubiTokenBurn(uint amount) private returns (uint, uint) {  
        uint orgAmount = amount;
        uint256 currentRate = _getRate();
        uint256 tBurn = amount.mul(_kyubiBurn).div(100);
        uint256 rBurn = tBurn.mul(currentRate);
        _tTotal = _tTotal.sub(tBurn);
        _rTotal = _rTotal.sub(rBurn);
        _kyubiBurned = _kyubiBurned.add(tBurn);
        return (orgAmount, tBurn);
    }
    
    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function _getValues(uint256 tAmount, uint256 tBurn) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 tTransferAmount, uint256 tFee, uint256 tTeam) = _getTValues(tAmount, _reflection, _teamFee, tBurn);
        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 taxFee, uint256 teamFee, uint256 tBurn) private pure returns (uint256, uint256, uint256) {
        uint256 tFee = tAmount.mul(taxFee).div(100);
        uint256 tTeam = tAmount.mul(teamFee).div(100);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tTeam).sub(tBurn);
        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 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 swapETHForEViral(uint ethAmount) private {
        address[] memory path = new address[](2);
        path[0] = uniswapV2Router.WETH();
        path[1] = address(eViral);

        _approve(address(this), address(uniswapV2Router), ethAmount);
        uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: ethAmount}(ethAmount,path,address(burnAddress),block.timestamp);
    }

    function sendETHToFee(uint256 amount) private {
            uint oneEigth = amount.div(8);
            _teamAddress.transfer(amount.div(16).mul(5));
            _marketingFunds.transfer(oneEigth);
            _developmentFunds1.transfer(oneEigth);
            _developmentFunds2.transfer(oneEigth);
    }

    receive() external payable {}
}