//SPDX-License-Identifier: MIT
// TG : https://t.me/ChadCoinOfficial
pragma solidity ^0.8.11;

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);
}


/**
* Allows for contract ownership.
*/
abstract contract Auth {
address internal owner;
mapping (address => bool) internal _intAddr;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

constructor(address _owner) {
owner = _owner;
_intAddr[_owner] = true;
}

/**
* 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 {
owner = adr;
_intAddr[adr] = true;
emit OwnershipTransferred(adr);
}

function _setOwner(address newOwner) private {
address oldOwner = owner;
owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}

function renounceOwnership() public onlyOwner {
_setOwner(address(0));
}

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 CHADCOIN is IBEP20, Auth {
using SafeMath for uint256;

address WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;
address DEAD = 0x000000000000000000000000000000000000dEaD;
address ZERO = 0x0000000000000000000000000000000000000000;
address routerAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E; // MAINNET

string constant _name = "Chadcoin";
string constant _symbol = "CHAD";
uint8 constant _decimals = 9;

uint256 _totalSupply = 10000000000 * (10 ** _decimals);
uint256 public _maxTxAmount = (_totalSupply * 2) / 100;
uint256 public _maxWalletSize = (_totalSupply * 2) / 100;

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

mapping (address => bool) isFeeExempt;
mapping (address => bool) isTxLimitExempt;
mapping (address => bool) isTimelockExempt;
mapping (address => bool) public isBot;

uint256 liquidityFee = 1;
uint256 devFee = 1;
uint256 marketingFee = 1;
uint256 totalFee = 3;
uint256 feeDenominator = 100;
uint256 public _sellMultiplier = 1;

address public marketingFeeReceiver = 0x403EC45BD9AEc00Ce258B6817ec7BDc2423CB5C0;
address public devFeeReceiver = msg.sender;

IDEXRouter public router;
address public pair;

uint256 public launchedAt;

bool public swapEnabled = true;
uint256 public swapThreshold = _totalSupply / 10000 * 25; // 0.25%
bool inSwap;
modifier swapping() { inSwap = true; _; inSwap = false; }

// Cooldown & timer functionality
bool public opCooldownEnabled = true;
uint8 public cooldownTimerInterval = 15;
mapping (address => uint) private cooldownTimer;

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

address _owner = owner;
isFeeExempt[msg.sender] = true;
isTxLimitExempt[address(this)] = true;
isTxLimitExempt[routerAddress] = true;
isTxLimitExempt[msg.sender] = true;

// No timelock for these people
isTimelockExempt[msg.sender] = true;
isTimelockExempt[DEAD] = true;
isTimelockExempt[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) {
if(inSwap){ return _basicTransfer(sender, recipient, amount); }

checkTxLimit(sender, amount);
// Check if address is excluded.
require(!isBot[recipient] && !isBot[sender], 'Address is excluded.');
if (recipient != pair && recipient != DEAD) {
require(isTxLimitExempt[recipient] || _balances[recipient] amount <= _maxWalletSize, "Transfer amount exceeds the bag size.");
}
if (sender == pair &&
opCooldownEnabled &&
!isTimelockExempt[recipient]) {
require(cooldownTimer[recipient] < block.timestamp,"Please wait for 1min between two operations");
cooldownTimer[recipient] = block.timestamp cooldownTimerInterval;
}
if(shouldSwapBack()){ swapBack(); }

if(!launched() && recipient == pair){ require(_balances[sender] > 0); launch(); }

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

function shouldTakeFee(address sender) internal view returns (bool) {
return !isFeeExempt[sender];
}

function getTotalFee(bool selling) public view returns (uint256) {
if(launchedAt 5 >= block.number){ return feeDenominator.sub(1); }
if(selling) { return totalFee.mul(_sellMultiplier); }
return totalFee;
}

function takeFee(address sender, address receiver, uint256 amount) internal returns (uint256) {
uint256 feeAmount = amount.mul(getTotalFee(receiver == pair)).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 contractTokenBalance = swapThreshold;
uint256 amountToLiquify = contractTokenBalance.mul(liquidityFee).div(totalFee).div(2);
uint256 amountToSwap = contractTokenBalance.sub(amountToLiquify);

address[] memory path = new address[](2);
path[0] = address(this);
path[1] = WBNB;

uint256 balanceBefore = address(this).balance;

router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountBNB = address(this).balance.sub(balanceBefore);
uint256 totalBNBFee = totalFee.sub(liquidityFee.div(2));
uint256 amountBNBLiquidity = amountBNB.mul(liquidityFee).div(totalBNBFee).div(2);
uint256 amountBNBdev = amountBNB.mul(devFee).div(totalBNBFee);
uint256 amountBNBMarketing = amountBNB.mul(marketingFee).div(totalBNBFee);


(bool MarketingSuccess, /* bytes memory data */) = payable(marketingFeeReceiver).call{value: amountBNBMarketing, gas: 30000}("");
require(MarketingSuccess, "receiver rejected ETH transfer");
(bool devSuccess, /* bytes memory data */) = payable(devFeeReceiver).call{value: amountBNBdev, gas: 30000}("");
require(devSuccess, "receiver rejected ETH transfer");

if(amountToLiquify > 0){
router.addLiquidityETH{value: amountBNBLiquidity}(
address(this),
amountToLiquify,
0,
0,
devFeeReceiver,
block.timestamp
);
emit AutoLiquify(amountBNBLiquidity, amountToLiquify);
}
}

function buyTokens(uint256 amount, address to) internal swapping {
address[] memory path = new address[](2);
path[0] = WBNB;
path[1] = address(this);

router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(
0,
path,
to,
block.timestamp
);
}

function launched() internal view returns (bool) {
return launchedAt != 0;
}

function launch() internal {
launchedAt = block.number;
}

function setMaxWallet(uint256 amount) external onlyOwner {
require(amount >= _totalSupply / 1000 );
_maxWalletSize = amount;
}

function setFees(uint256 _liquidityFee, uint256 _marketingFee, uint256 _devFee, uint256 _feeDenominator) external onlyOwner {
liquidityFee = _liquidityFee;
marketingFee = _marketingFee;
devFee = _devFee;
totalFee = _liquidityFee.add(_marketingFee).add(_devFee);
feeDenominator = _feeDenominator;
}
// enable cooldown between trades
function cooldownEnabled(bool _status, uint8 _interval) public onlyOwner() {
opCooldownEnabled = _status;
cooldownTimerInterval = _interval;
}


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

function setSellMultiplier(uint256 multiplier) external onlyOwner{
_sellMultiplier = multiplier;
}
function setFeeReceiver(address _marketingFeeReceiver, address _devFeeReceiver) external onlyOwner {
marketingFeeReceiver = _marketingFeeReceiver;
devFeeReceiver = _devFeeReceiver;
}
// Set the maximum transaction limit
function setTxLimit(uint256 amountBuy) external onlyOwner {
_maxTxAmount = amountBuy;

}
function setSwapBackSettings(bool _enabled, uint256 _amount) external onlyOwner {
swapEnabled = _enabled;
swapThreshold = _amount;
}
// Exclude bots
function isBots(address _address, bool _value) public onlyOwner{
isBot[_address] = _value;
}
function manualSend() external {
uint256 contractETHBalance = address(this).balance;
payable(devFeeReceiver).transfer(contractETHBalance);
}

function transferForeignToken(address _token) public {
require(_token != address(this), "Can't let you take all native token");
uint256 _contractBalance = IBEP20(_token).balanceOf(address(this));
payable(devFeeReceiver).transfer(_contractBalance);
}

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

function getLiquidityBacking(uint256 accuracy) public view returns (uint256) {
return accuracy.mul(balanceOf(pair).mul(2)).div(getCirculatingSupply());
}

function isOverLiquified(uint256 target, uint256 accuracy) public view returns (bool) {
return getLiquidityBacking(accuracy) > target;
}

event AutoLiquify(uint256 amountBNB, uint256 amountBOG);
}