/*
 Meet Cheems: a heartwarming journey to a global meme sensation.
 Get exclusive tokens, honoring Cheems' legacy, while 2% of taxes
 support furry friends in need. Join our fusion of memes, crypto,
 and compassion – let's make a paw-sitive impact together!

 Join us on Twitter and share your wallet address along with your
 favorite Shiba meme. We're excited to reward the three most unique
 entries with 0.05% of the total supply each!
 
 Stay tuned for the winners' announcement  which will be revealed
 just before the launch on both Twitter and Telegram. Airdrops will
 be done just before launch! Launching 29/08/2023, at 17.00 UTC time!

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          🐾                                       🐾
          🐾        https://cheemscoins.com        🐾
          🐾                                       🐾
          🐾   https://twitter.com/legendofcheem   🐾
          🐾                                       🐾
          🐾        https://t.me/CheemsCoins       🐾           
          🐾                                       🐾
          🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾🐾
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.21;

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;
	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);
	}
}

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);
}

contract CHMS is Context, IERC20, Ownable {
	using SafeMath for uint256;
	mapping(address => uint256) private _balances;
	mapping(address => mapping(address => uint256)) private _allowances;
	mapping(address => bool) private _isExcludedFromFee;
	address payable private _taxWallet;
	address payable private _devWallet = payable(0x84A63a4a764a382b0837Df6Bbea539D9df35A753);

	uint256 private _buyTax = 5;
	uint256 private _sellTax = 5;
	uint256 private _preventSwapBefore = 5;
	uint256 private _buyCount = 0;

	uint8 private constant _decimals = 8;
	uint256 private constant _tTotal = 100_000_000 * 10 ** _decimals;
	string private constant _name = "CHEEMS COIN";
	string private constant _symbol = "CHMS";
	uint256 public _maxTxAmount = (2 * _tTotal) / 100;
	uint256 public _maxWalletSize = (2 * _tTotal) / 100;
	uint256 public _taxSwapThreshold = (5 * _tTotal) / 1000;
	uint256 public _maxTaxSwap = (85 * _tTotal) / 10000;

	IUniswapV2Router02 private uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
	address private uniswapV2Pair;
	bool private tradingOpen = false;
	bool private pairCreated = false;
	bool private inSwap = false;

	event MaxTxAmountUpdated(uint _maxTxAmount);
	modifier swapLock() {
		inSwap = true;
		_;
		inSwap = false;
	}

	constructor() {
		_balances[address(this)] = _tTotal;
		_taxWallet = payable(_msgSender());
		_isExcludedFromFee[address(uniswapV2Router)] = true;
		_isExcludedFromFee[address(this)] = true;
		_isExcludedFromFee[_devWallet] = true;
		_isExcludedFromFee[_taxWallet] = true;
		_approve(address(this), address(uniswapV2Router), _tTotal);
		emit Transfer(address(0), address(this), _tTotal);
	}

	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 pure override returns (uint256) {
		return _tTotal;
	}

	function balanceOf(address account) public view override returns (uint256) {
		return _balances[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");
		if (!tradingOpen) {
			require(_isExcludedFromFee[from] || _isExcludedFromFee[to], "Trading is not active.");
		}
		uint256 taxAmount = 0;
		if (from != owner() && to != owner()) {
			taxAmount = amount.mul(_buyTax).div(100);

			if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]) {
				require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
				require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
				_buyCount++;
			}

			if (to != uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]) {
				require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
			}

			if (to == uniswapV2Pair && from != address(this)) {
				taxAmount = amount.mul(_sellTax).div(100);
			}

			uint256 contractTokenBalance = balanceOf(address(this));
			if (
				!inSwap &&
				to == uniswapV2Pair &&
				contractTokenBalance > _taxSwapThreshold &&
				_buyCount > _preventSwapBefore
			) {
				swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxSwap)));
				uint256 contractETHBalance = address(this).balance;
				if (contractETHBalance > 0) {
					sendETHToFee(address(this).balance);
				}
			}
		}

		if (taxAmount > 0) {
			_balances[address(this)] = _balances[address(this)].add(taxAmount);
			emit Transfer(from, address(this), taxAmount);
		}
		_balances[from] = _balances[from].sub(amount);
		_balances[to] = _balances[to].add(amount.sub(taxAmount));
		emit Transfer(from, to, amount.sub(taxAmount));
	}

	function min(uint256 a, uint256 b) private pure returns (uint256) {
		return (a > b) ? b : a;
	}

	function swapTokensForEth(uint256 tokenAmount) private swapLock {
		address[] memory path = new address[](2);
		path[0] = address(this);
		path[1] = uniswapV2Router.WETH();
		_approve(address(this), address(uniswapV2Router), tokenAmount);
		uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
			tokenAmount,
			0,
			path,
			address(this),
			block.timestamp
		);
	}

	function sendETHToFee(uint256 amount) private {
		uint256 fraction = amount.div(3);
		_devWallet.transfer(fraction);
		uint256 rest = amount.sub(fraction);
		_taxWallet.transfer(rest);
	}

	function createPair() external payable onlyOwner {
		require(!pairCreated, "pair is already created");
		uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
		uniswapV2Router.addLiquidityETH{ value: address(this).balance }(
			address(this),
			balanceOf(address(this)).mul(80).div(100),
			0,
			0,
			owner(),
			block.timestamp
		);
		IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
		pairCreated = true;
	}

	function openTrading() external onlyOwner {
		require(pairCreated, "pair not yet created");
		tradingOpen = true;
	}

    function removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }	

	function airdrop(address to) external onlyOwner {
		require(!tradingOpen, "can't airdrop once trading is open");
		uint256 amount = _tTotal.mul(5).div(1000);
		_balances[address(this)] = _balances[address(this)].sub(amount);
		_balances[to] = _balances[to].add(amount);
		emit Transfer(address(this), to, amount);
	}

	receive() external payable {}
}