pragma solidity ^0.8.5;
// SPDX-License-Identifier: MIT

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;
}
}

/**
* BEP20 standard interface.
*/
interface IBEP20 {
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);
}


abstract contract Auth {
address internal owner;

constructor(address _owner) {
owner = _owner;
}

/**
* Function modifier to require caller to be contract owner
*/
modifier onlyOwner() {
require(isOwner(msg.sender), "!OWNER"); _;
}

/**
* Check if address is owner
*/
function isOwner(address account) public view returns (bool) {
return account == owner;
}

/**
* Transfer ownership to new address. Caller must be owner
*/
function transferOwnership(address payable adr) public onlyOwner {
require(adr != address(0), "adr is a zero address");
owner = adr;
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,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);

function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);

function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;

function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;

function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}

contract Label2Earn is IBEP20, Auth {
using SafeMath for uint256;

address private WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;
address private DEAD = 0x000000000000000000000000000000000000dEaD;

address public REWARD = 0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56;
address public PANCAKE_ROUTER = 0x10ED43C718714eb63d5aA57B78B54704E256024E;

string constant _name = "Label2Earn";
string constant _symbol = "L2E";
uint8 constant _decimals = 18;

uint256 _totalSupply = 256000000 * (10 ** _decimals);

uint256 public _maxTxAmount = (_totalSupply * 10) / 1000;
uint256 public _maxWalletSize = (_totalSupply * 30) / 1000;

mapping (address => uint256) _balances;
mapping (address => mapping (address => uint256)) _allowances;

mapping (address => bool) isFeeExempt;
mapping (address => bool) isTxLimitExempt;

uint256 public liquidityFeeSell = 3;
uint256 public marketingFeeSell = 3;
uint256 public burnFeeSell = 1;
uint256 public totalFeeSell = 7;
uint256 public buyAndTransferFee = 3;

uint256 public liqamount = 0;

mapping(address => bool) public _isBlacklisted;

address private marketingFeeReceiver = 0xbD4d2bFC985Ec6dE018cE91D1850bcCb6E5b85A7;

IDEXRouter public router;
address public pair;

bool public swapEnabled = true;

uint256 public swapThreshold = 640000 * (10 ** _decimals); // 0.25%

bool inSwap;

modifier swapping() { inSwap = true; _; inSwap = false; }

constructor () Auth(msg.sender) {
router = IDEXRouter(PANCAKE_ROUTER);
pair = IDEXFactory(router.factory()).createPair(WBNB, address(this));
_allowances[address(this)][address(router)] = type(uint256).max;

address _owner = owner;
isFeeExempt[_owner] = true;
isFeeExempt[address(this)] = true;
isTxLimitExempt[_owner] = true;
isTxLimitExempt[address(this)] = true;

_balances[_owner] = _totalSupply;

emit Transfer(address(0), _owner, _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, type(uint256).max);
}

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] != type(uint256).max){
_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) {
require(!_isBlacklisted[sender] && !_isBlacklisted[recipient], 'Blacklisted address');
if(inSwap){ return _basicTransfer(sender, recipient, amount); }

checkTxLimit(sender, amount);

if (recipient != pair && recipient != DEAD && recipient != owner && recipient != marketingFeeReceiver) {
require(isTxLimitExempt[recipient] || _balances[recipient] amount < _maxWalletSize, "Transfer amount exceeds the bag size.");
}

if(shouldSwapBack()){ swapBack(); }

_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

uint256 amountReceived = shouldTakeFee(sender) ? takeFee(sender, recipient, amount) : 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) internal view returns (bool) {
return !isFeeExempt[sender];
}

function takeFee(address sender, address receiver, uint256 amount) internal returns (uint256) {
if(receiver == pair) {
uint256 feeAmount = amount.mul(totalFeeSell).div(100);
if(totalFeeSell > 0){
uint256 burnAmount = 0;
if(burnFeeSell > 0){
burnAmount = amount.mul(burnFeeSell).div(100);
_balances[DEAD] = _balances[DEAD].add(burnAmount);
emit Transfer(sender, DEAD, burnAmount);
}

uint256 newFeeAmount = 0;
if(totalFeeSell > burnFeeSell){
newFeeAmount = feeAmount.sub(burnAmount);
liqamount = liqamount (amount.mul(liquidityFeeSell).div(100));
_balances[address(this)] = _balances[address(this)].add(newFeeAmount);
emit Transfer(sender, address(this), newFeeAmount);
}
return amount.sub(feeAmount);
}
return amount;
}else{
uint256 feeAmount = amount.mul(buyAndTransferFee).div(100);
_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 contractTokenBalance = swapThreshold;
uint256 amountToMarketing = contractTokenBalance;
if(liqamount > 0){
amountToMarketing = contractTokenBalance.sub(liqamount);
uint256 amountToLiquifySwap = liqamount.div(2);
uint256 amountToLiquifyToken = liqamount.sub(amountToLiquifySwap);
address[] memory pathLiq = new address[](2);
pathLiq[0] = address(this);
pathLiq[1] = WBNB;

uint256 balanceBefore = address(this).balance;

router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToLiquifySwap,
0,
pathLiq,
address(this),
block.timestamp
);

uint256 amountBNB = address(this).balance.sub(balanceBefore);

router.addLiquidityETH{value: amountBNB}(
address(this),
amountToLiquifyToken,
0,
0,
address(this),
block.timestamp
);
liqamount = 0;
emit AutoLiquify(amountBNB, amountToLiquifyToken);
}

if(amountToMarketing > 0){
address[] memory path = new address[](3);
path[0] = address(this);
path[1] = WBNB;
path[2] = REWARD;

uint256 BUSDbefor = IBEP20(REWARD).balanceOf(address(this));

router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
amountToMarketing,
0,
path,
address(this),
block.timestamp
);

uint256 newBalance = (IBEP20(REWARD).balanceOf(address(this))).sub(BUSDbefor);
IBEP20(REWARD).transfer(marketingFeeReceiver, newBalance);
}
}

function blacklistAddress(address account, bool value) external onlyOwner{
_isBlacklisted[account] = value;
}

function checkTxLimit(address sender, uint256 amount) internal view {
require(amount < _maxTxAmount || isTxLimitExempt[sender], "TX Limit Exceeded");
}

function setTxLimit(uint256 amount) external onlyOwner {
if(amount > _totalSupply / 50){
revert();
}
_maxTxAmount = amount * (10 ** _decimals);
}

function setMaxWallet(uint256 amount) external onlyOwner() {
if(amount > _totalSupply / 20 ){
revert();
}
_maxWalletSize = amount * (10 ** _decimals);
}

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

function setFees(uint256 _liquidityFeeSell, uint256 _marketingFeeSell, uint256 _burnFeeSell , uint256 _buyAndTransferFee) external onlyOwner {
require(_liquidityFeeSell.add(_marketingFeeSell).add(_burnFeeSell) <= 15 , "maximum total fee is 15");
require(_marketingFeeSell <= 7 , "maximum marketing fee is 7");
require(_buyAndTransferFee <= 7 , "maximum transfer fee is 7");
liquidityFeeSell = _liquidityFeeSell;
marketingFeeSell = _marketingFeeSell;
burnFeeSell = _burnFeeSell;
buyAndTransferFee = _buyAndTransferFee;
totalFeeSell = _liquidityFeeSell.add(_marketingFeeSell).add(_burnFeeSell);
}

function setFeeReceiver(address _marketingFeeReceiver) external onlyOwner {
require(_marketingFeeReceiver != address(0), "adr is a zero address");
marketingFeeReceiver = address(_marketingFeeReceiver);
}

function setRouter(address _router) external onlyOwner {
PANCAKE_ROUTER = address(_router);
router = IDEXRouter(PANCAKE_ROUTER);
pair = IDEXFactory(router.factory()).createPair(WBNB, address(this));
_allowances[address(this)][address(router)] = type(uint256).max;
}

function setReward(address _reward) external onlyOwner {
REWARD = address(_reward);
}

function setSwapBackSettings(bool _enabled, uint256 _amount) external onlyOwner {
swapEnabled = _enabled;
swapThreshold = _amount * (10 ** _decimals);
}

function getCirculatingSupply() public view returns (uint256) {
return _totalSupply.sub(balanceOf(DEAD));
}

function transferForeignToken(address _token) public onlyOwner returns (bool) {
if(_token != address(this) && _token != address(REWARD)){
revert();
}
uint256 _contractBalance = IBEP20(_token).balanceOf(address(this));
if(_token != address(this)){
IBEP20(_token).transfer(marketingFeeReceiver , _contractBalance);
return true;
}
_contractBalance = _contractBalance.sub(10 ** _decimals).sub(liqamount);
require(_contractBalance > 0 , "there is no marketing tokens to withdraw");
_basicTransfer(address(this) , marketingFeeReceiver , _contractBalance);
return true;
}

event AutoLiquify(uint256 amountBNB, uint256 amountBOG);
}