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

    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 _isExcludedFromMax;
    mapping (address => bool) private _isExcluded;
    mapping (address => bool) isBlacklisted;
    address[] private _excluded;
   
    uint256 private constant MAX = ~uint256(0);
    uint256 private _tTotal = 100000069 * 10**18;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;

    address private _devAddress = 0xF3C38c8dD73557c03558d56CC1f36DcCB5BA01EC;
    address private _burnAddress = 0x0000000000000000000000000000000000000001;

    string private _name = "Fubuki Token";
    string private _symbol = "FUBUKI";
    uint8 private _decimals = 18;
    
    uint256 public _taxFee = 2;
    uint256 private _previousTaxFee = _taxFee;

    uint256 public _devFee = 5;
    uint256 private _previousDevFee = _devFee;

    uint256 public _burnFee = 2;
    uint256 private _previousBurnFee = _burnFee;

    uint256 private _beforeLaunchFee = 99;
    uint256 private _previousBeforeLaunchFee = _beforeLaunchFee;


    uint256 public launchedAt;
    uint256 public launchedAtTimestamp;

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public uniswapV2Pair;
        
    uint256 public _maxTxAmount = _tTotal.div(200).mul(1);
    uint256 public _maxWalletToken = _tTotal.div(100).mul(1);
        
    constructor () public {
        _rOwned[_msgSender()] = _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, dev wallet, and this contract from fee
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_devAddress] = true;

        _isExcludedFromMax[owner()] = true;
        _isExcludedFromMax[address(this)] = true;
        _isExcludedFromMax[_devAddress] = true;
        _isExcludedFromMax[uniswapV2Pair] = true;

        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) {
        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 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 isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function setIsBlacklisted(address account, bool blacklisted) external onlyOwner() {
        isBlacklisted[account] = blacklisted;
    }

    function blacklistMultipleAccounts(address[] calldata accounts, bool blacklisted) external onlyOwner() {
        for (uint256 i = 0; i < accounts.length; i++) {
            isBlacklisted[accounts[i]] = blacklisted;
        }
    }

    function isAccountBlacklisted(address account) external view returns (bool) {
        return isBlacklisted[account];
    }

    function isExcludedFromMax(address holder, bool exempt) external onlyOwner() {
        _isExcludedFromMax[holder] = exempt;
    }

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

    function burnAddress() public view returns (address) {
        return _burnAddress;
    }

    function devAddress() public view returns (address) {
        return _devAddress;
    }

    function launch() public onlyOwner() {
        require(launchedAt == 0, "Already launched.");
        launchedAt = block.number;
        launchedAtTimestamp = block.timestamp;
    }

    function deliver(uint256 tAmount) public {
        address sender = _msgSender();
        require(!_isExcluded[sender], "Excluded addresses cannot call this function");

        (,uint256 tFee, uint256 tDev, uint256 tBurn) = _getTValues(tAmount);
        (uint256 rAmount,,) = _getRValues(tAmount, tFee, tDev, tBurn, _getRate());
        
        _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");
        
        (,uint256 tFee, uint256 tDev, uint256 tBurn) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount,) = _getRValues(tAmount, tFee, tDev, tBurn, _getRate());

        if (!deductTransferFee) {
            return rAmount;
        } else {
            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 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 _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 tTransferAmount, uint256 tFee, uint256 tDev, uint256 tBurn) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tDev, tBurn, _getRate());

        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeDevFee(tDev);
        _takeBurnFee(tBurn);
        _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 setTaxFeePercent(uint256 taxFee) external onlyOwner() {
        _taxFee = taxFee;
    }
    
    function setMaxTxPercent(uint256 maxTxPercent) external onlyOwner() {
        _maxTxAmount = _tTotal.mul(maxTxPercent).div(
            10**2
        );
    }

    function setMaxWalletPercent(uint256 maxWalletToken) external onlyOwner() {
        _maxWalletToken = _tTotal.mul(maxWalletToken).div(
            10**2
        );
    }
    
     //to recieve ETH from uniswapV2Router when swapping
    receive() external payable {}

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

    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256) {
        uint256 tFee = calculateTaxFee(tAmount);
        uint256 tDev = calculateDevFee(tAmount);
        uint256 tBurn = calculateBurnFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tDev);
                tTransferAmount = tTransferAmount.sub(tBurn);

        return (tTransferAmount, tFee, tDev, tBurn);
    }

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tDev, uint256 tBurn, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rDev = tDev.mul(currentRate);
        uint256 rBurn = tBurn.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rDev).sub(rBurn);
        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;      
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
            rSupply = rSupply.sub(_rOwned[_excluded[i]]);
            tSupply = tSupply.sub(_tOwned[_excluded[i]]);
        }
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

    function _takeDevFee(uint256 tDev) private {
        uint256 currentRate =  _getRate();
        uint256 rDev = tDev.mul(currentRate);
        _rOwned[_devAddress] = _rOwned[_devAddress].add(rDev);
        if(_isExcluded[_devAddress])
            _tOwned[_devAddress] = _tOwned[_devAddress].add(tDev);
    }

    function _takeBurnFee(uint256 tBurn) private {
        uint256 currentRate =  _getRate();
        uint256 rBurn = tBurn.mul(currentRate);
        _rOwned[_burnAddress] = _rOwned[_burnAddress].add(rBurn);
        if(_isExcluded[_burnAddress])
            _tOwned[_burnAddress] = _tOwned[_burnAddress].add(tBurn);
    }

    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        uint256 fee = launchedAt == 0 ? 0 : _taxFee;
        return _amount.mul(fee).div(
            10**2
        );
    }

    function calculateDevFee(uint256 _amount) private view returns (uint256) {
        uint256 fee = launchedAt == 0 ? 0 : _devFee;
        return _amount.mul(fee).div(
            10**2
        );
    }

    function calculateBurnFee(uint256 _amount) private view returns (uint256) {
        uint256 fee = launchedAt == 0 ? _beforeLaunchFee : _burnFee;
        return _amount.mul(fee).div(
            10**2
        );
    }

    function removeAllFee() private {
        if(_taxFee == 0 && _devFee == 0) return;
        
        _previousTaxFee = _taxFee;
        _previousDevFee = _devFee;
        _previousBurnFee = _burnFee;
        _previousBeforeLaunchFee = _beforeLaunchFee;
        
        _taxFee = 0;
        _devFee = 0;
        _burnFee = 0;
        _beforeLaunchFee = 0;
    }

    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _devFee = _previousDevFee;
        _burnFee = _previousBurnFee;
        _beforeLaunchFee = _previousBeforeLaunchFee;
    }

    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(!isBlacklisted[from], "Blacklisted address");

        if(!_isExcludedFromMax[from] || !_isExcludedFromMax[to]) {
            require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
            uint256 heldTokens = balanceOf(to); 
            require((heldTokens + amount) <= _maxWalletToken, "Total Holding is currently limited, you can not buy that much.");
        }
        
        //indicates if fee should be deducted from transfer
        bool takeFee = true;
        
        //if any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }
        
        //transfer amount, it will take tax, burn fee
        _tokenTransfer(from,to,amount,takeFee);
    }

    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 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 tTransferAmount, uint256 tFee, uint256 tDev, uint256 tBurn) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tDev, tBurn, _getRate());
        
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeDevFee(tDev);
        _takeBurnFee(tBurn);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 tTransferAmount, uint256 tFee, uint256 tDev, uint256 tBurn) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tDev, tBurn, _getRate());

        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);           
        _takeDevFee(tDev);
        _takeBurnFee(tBurn);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 tTransferAmount, uint256 tFee, uint256 tDev, uint256 tBurn) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tDev, tBurn, _getRate());

        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);   
        _takeDevFee(tDev);
        _takeBurnFee(tBurn);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }
}
/*
 To be modified before deploying this contract for a project:
 - Uniswap Router address if not on ETH
 - Dev address
 */
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();
    }
//this method is responsible for taking all fee, if takeFee is true