// SPDX-License-Identifier: MIT
pragma solidity ^0.7.4;

/**
* Telegram: https://t.me/SafuLabs
* BuyBot: https://t.me/SafuBuyBot
* SafuLabsTrending: https://t.me/SafuLabsTrending
* Twitter: https://twitter.com/SafuLabs
*/

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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }
}

/**
 * ERC20 standard interface.
 */
interface ERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function getOwner() external view returns (address);
    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);
}

/**
 * Allows for contract ownership along with multi-address authorization
 */
abstract contract Auth {
    address internal owner;
    mapping (address => bool) internal authorizations;

    constructor(address _owner) {
        owner = _owner;
        authorizations[_owner] = true;
    }

    /**
     * Function modifier to require caller to be contract owner
     */
    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER"); _;
    }

    /**
     * Function modifier to require caller to be authorized
     */
    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED"); _;
    }

    /**
     * Authorize address. Owner only
     */
    function authorize(address adr) public onlyOwner {
        authorizations[adr] = true;
    }

    /**
     * Remove address' authorization. Owner only
     */
    function unauthorize(address adr) public onlyOwner {
        authorizations[adr] = false;
    }

    /**
     * Check if address is owner
     */
    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    /**
     * Return address' authorization status
     */
    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }

    /**
     * Transfer ownership to new address. Caller must be owner. Leaves old owner authorized
     */
    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

contract SLABS is ERC20, Auth {
    using SafeMath for uint256;

    address public WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "SafuLabs";
    string constant _symbol = "SLABS";
    uint8 constant _decimals = 18;

    uint256 _totalSupply = 100*10**4 * (10 ** _decimals);

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;
    
    uint256 feeDenominator = 10000;
    
    uint256 devPerc = 25;
    uint256 marketingPerc = 25;
    uint256 lpPerc = 25;
    uint256 stakingPerc = 75;

    uint256 totalTaxPerc = 150;

    address public autoLiquidityReceiver;
    address public marketingFeeReceiver;
    address public devFeeReceiver;
    address public stakingFeeReceiver;


    IDEXRouter public router;
    address public pair;

    uint256 public launchedAt;
    uint256 public launchedAtTimestamp;

    bool start = false;

    bool public swapEnabled = true;
    uint256 public swapThreshold = _totalSupply / 2000;
    bool inSwap;
    modifier swapping() { inSwap = true; _; inSwap = false; }

    constructor (
        address _dexRouter
    ) Auth(msg.sender) {
        router = IDEXRouter(_dexRouter);
        pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
        _allowances[address(this)][address(router)] = uint256(-1);
        WETH = router.WETH();

        autoLiquidityReceiver = msg.sender;
        marketingFeeReceiver = msg.sender;
        devFeeReceiver = msg.sender;
        stakingFeeReceiver = msg.sender;
        
        approve(_dexRouter, uint256(-1));
        approve(address(pair), uint256(-1));
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable { }

    function totalSupply() external view override returns (uint256) { return _totalSupply; }
    function decimals() external pure override returns (uint8) { return _decimals; }
    function symbol() external pure override returns (string memory) { return _symbol; }
    function name() external pure override returns (string memory) { return _name; }
    function getOwner() external view override returns (address) { return owner; }
    function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, uint256(-1));
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) { 
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if(_allowances[sender][msg.sender] != uint256(-1)){
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
        }

        return _transferFrom(sender, recipient, amount);
    }
    
    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {

        uint256 totalTax = totalTaxPerc;

        if(inSwap){ return _basicTransfer(sender, recipient, amount); }
        
        require(start == true,"Trading not started yet");
     
        if(shouldSwapBack()){ swapBack(); }

        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

        uint256 amountReceived;
        
        if (shouldTakeFee(sender, recipient)) {
            amountReceived = takeFee(sender,amount,totalTax);
        } else {
            amountReceived = amount;
        }

        _balances[recipient] = _balances[recipient].add(amountReceived);

        emit Transfer(sender, recipient, amountReceived);
        return true;
    }

    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }


    function shouldTakeFee(address sender, address recipient) internal view returns (bool) {
        if (sender != pair && recipient != pair){ //if tokens are from/to the lp then its a taxable event
            return false;
        } else {
            return true;
        }
    }

    function takeFee(address sender, uint256 amount,uint256 taxPercentage) internal returns (uint256) {
        uint256 feeAmount = amount.mul(taxPercentage).div(feeDenominator); 
        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);

        return amount.sub(feeAmount);
    }

    function shouldSwapBack() internal view returns (bool) {
        return msg.sender != pair
        && !inSwap
        && swapEnabled
        && _balances[address(this)] >= swapThreshold;
    }

    function swapBack() internal swapping {

        uint256 amountToLiquify = swapThreshold.mul(lpPerc).div(totalTaxPerc).div(2);
        uint256 amountToSwap = swapThreshold.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;
        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance.sub(balanceBefore);

        uint256 totalETHFee = totalTaxPerc.sub(lpPerc.div(2));

        uint256 amountETHLiquidity = amountETH.mul(lpPerc).div(totalETHFee).div(2); 
        uint256 amountETHMarketing = amountETH.mul(marketingPerc).div(totalETHFee);
        uint256 amountETHDev = amountETH.mul(devPerc).div(totalETHFee);
        uint256 amountETHStake = amountETH.mul(stakingPerc).div(totalETHFee);

        payable(marketingFeeReceiver).transfer(amountETHMarketing);
        payable(devFeeReceiver).transfer(amountETHDev);
        payable(stakingFeeReceiver).transfer(amountETHStake);
            
        if(amountToLiquify > 0){
            router.addLiquidityETH{value: amountETHLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoLiquidityReceiver,
                block.timestamp
            );
            emit AutoLiquify(amountETHLiquidity, amountToLiquify);
            
        }
    }
     
    function launched() internal view returns (bool) {
        return launchedAt != 0;
    }

    function launch() public authorized {
        require(launchedAt == 0, "Already launched boi");
        launchedAt = block.number;
        launchedAtTimestamp = block.timestamp;
    }

    
    function startTrading() external authorized {
        start = true;
    }

    function burnTokens(uint256 amount) external authorized {
       uint256 contractBalance = _balances[address(this)];
       require(contractBalance > amount,"Not Enough tokens to burn");

       _transferFrom(address(this),DEAD,amount);

    }

    function TransferBNBsOutfromContract(uint256 amount, address payable receiver) external authorized {
        uint256 contractBalance = address(this).balance;
        require(contractBalance > amount,"Not Enough bnbs");
        receiver.transfer(amount);
    
    }

    function setFeeReceivers(address _autoLiquidityReceiver, address _marketingFeeReceiver, address _devFeeReceiver, address _stakingFeeReceiver) external authorized {
        autoLiquidityReceiver = _autoLiquidityReceiver;
        marketingFeeReceiver = _marketingFeeReceiver;
        devFeeReceiver = _devFeeReceiver;
        stakingFeeReceiver = _stakingFeeReceiver;

    }

    function setSwapBackSettings(bool _enabled, uint256 _amount) external authorized {
        swapEnabled = _enabled;
        swapThreshold = _amount;
    }

    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

    function updateTaxes(uint256 _totalTax, uint256 _devTax, uint256 _marketingPerc, uint256 _lpPerc, uint256 _stakingPerc) external authorized {
        totalTaxPerc = _totalTax;
        devPerc = _devTax;
        marketingPerc = _marketingPerc;
        lpPerc = _lpPerc;
        stakingPerc = _stakingPerc;
    }

    function getFixedTaxes() public view returns (uint256,uint256,uint256,uint256,uint256){
        return(totalTaxPerc,devPerc,marketingPerc,lpPerc,stakingPerc);
    }

    event AutoLiquify(uint256 amountBNB, uint256 amountBOG);
}