// Contract: SCARDust
// Target function: function setBaseFeesOnBuy(uint8 _liquidityFeeOnBuy, uint8 _operationsFeeOnBuy, uint8 _buybackFeeOnBuy, uint8 _charityFeeOnBuy) external onlyOwner
 {
	function createPair(address tokenA, address tokenB)
	external
	returns (address pair);

	function getPair(address tokenA, address tokenB)
	external
	view
	returns (address pair);
}

interface IRouter {
	function factory() external pure returns (address);

	function WETH() external pure returns (address);

	function addLiquidityETH(
		address token,
		uint256 amountTokenDesired,
		uint256 amountTokenMin,
		uint256 amountETHMin,
		address to,
		uint256 deadline
	)
	external
	payable
	returns (
		uint256 amountToken,
		uint256 amountETH,
		uint256 liquidity
	);

	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;
}

interface IERC20Metadata is IERC20 {
	function name() external view returns (string memory);
	function symbol() external view returns (string memory);
	function decimals() external view returns (uint8);
}

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) {
		// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
		// benefit is lost if 'b' is also tested.
		// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
		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;
		// assert(a == b * c + a % b); // There is no case in which this doesn't hold

		return c;
	}

	function mod(uint256 a, uint256 b) internal pure returns (uint256) {
		return mod(a, b, "SafeMath: modulo by zero");
	}

	function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
		require(b != 0, errorMessage);
		return a % b;
	}
}

abstract contract Context {
	function _msgSender() internal view virtual returns (address) {
		return msg.sender;
	}

	function _msgData() internal view virtual returns (bytes calldata) {
		this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
		return msg.data;
	}
}

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);
	}

	function transferOwnership(address newOwner) public virtual onlyOwner {
		require(newOwner != address(0), "Ownable: new owner is the zero address");
		emit OwnershipTransferred(_owner, newOwner);
		_owner = newOwner;
	}
}

contract ERC20 is Context, IERC20, IERC20Metadata {
	using SafeMath for uint256;

	mapping(address => uint256) private _balances;
	mapping(address => mapping(address => uint256)) private _allowances;

	uint256 private _totalSupply;
	string private _name;
	string private _symbol;

	constructor(string memory name_, string memory symbol_) {
		_name = name_;
		_symbol = symbol_;
	}

	function name() public view virtual override returns (string memory) {
		return _name;
	}

	function symbol() public view virtual override returns (string memory) {
		return _symbol;
	}

	function decimals() public view virtual override returns (uint8) {
		return 18;
	}

	function totalSupply() public view virtual override returns (uint256) {
		return _totalSupply;
	}

	function balanceOf(address account) public view virtual override returns (uint256) {
		return _balances[account];
	}

	function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
		_transfer(_msgSender(), recipient, amount);
		return true;
	}

	function allowance(address owner, address spender) public view virtual override returns (uint256) {
		return _allowances[owner][spender];
	}

	function approve(address spender, uint256 amount) public virtual override returns (bool) {
		_approve(_msgSender(), spender, amount);
		return true;
	}

	function transferFrom(
		address sender,
		address recipient,
		uint256 amount
	) public virtual override returns (bool) {
		_transfer(sender, recipient, amount);
		_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
		return true;
	}

	function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
		_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
		return true;
	}

	function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
		_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
		return true;
	}

	function _transfer(
		address sender,
		address recipient,
		uint256 amount
	) internal virtual {
		require(sender != address(0), "ERC20: transfer from the zero address");
		require(recipient != address(0), "ERC20: transfer to the zero address");
		_beforeTokenTransfer(sender, recipient, amount);
		_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
		_balances[recipient] = _balances[recipient].add(amount);
		emit Transfer(sender, recipient, amount);
	}

	function _mint(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: mint to the zero address");
		_beforeTokenTransfer(address(0), account, amount);
		_totalSupply = _totalSupply.add(amount);
		_balances[account] = _balances[account].add(amount);
		emit Transfer(address(0), account, amount);
	}

	function _burn(address account, uint256 amount) internal virtual {
		require(account != address(0), "ERC20: burn from the zero address");
		_beforeTokenTransfer(account, address(0), amount);
		_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
		_totalSupply = _totalSupply.sub(amount);
		emit Transfer(account, address(0), amount);
	}

	function _approve(
		address owner,
		address spender,
		uint256 amount
	) internal virtual {
		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 _beforeTokenTransfer(
		address from,
		address to,
		uint256 amount
	) internal virtual {}
}

contract SCARDust is ERC20, Ownable {
	IRouter public uniswapV2Router;
	address public immutable uniswapV2Pair;

	string private constant _name = "SCARDust";
	string private constant _symbol = "SCARD";
	uint8 private constant _decimals = 18;

	bool public isTradingEnabled;
	uint256 private _launchTimestamp;
	uint256 private _launchBlockNumber;

	// initialSupply
	uint256 constant initialSupply = 10000000000003 * (10**18);

	// max wallet is 4% of initialSupply
	uint256 public maxWalletAmount = initialSupply * 400 / 10000;

	// max transaction is 4% of initialSupply
	uint256 public maxTxAmount = initialSupply * 400 / 10000;

	bool private _swapping;
	// swap and liquify at 0.025% of initialSupply
	uint256 public minimumTokensBeforeSwap = initialSupply * 250 / 1000000;

	address public liquidityWallet;
	address public operationsWallet;
	address public buyBackWallet;
	address public charityWallet;

	struct CustomTaxPeriod {
		bytes23 periodName;
		uint8 blocksInPeriod;
		uint256 timeInPeriod;
		uint8 liquidityFeeOnBuy;
		uint8 liquidityFeeOnSell;
		uint8 operationsFeeOnBuy;
		uint8 operationsFeeOnSell;
		uint8 buyBackFeeOnBuy;
		uint8 buyBackFeeOnSell;
		uint8 charityFeeOnBuy;
		uint8 charityFeeOnSell;
	}
	// Base taxes
	CustomTaxPeriod private _default = CustomTaxPeriod('default',0,0,2,2,5,5,4,4,3,3);
	CustomTaxPeriod private _base = CustomTaxPeriod('base',0,0,2,2,5,5,4,4,3,3);

	uint256 private constant _blockedTimeLimit = 172800;
	bool private _feeOnWalletTranfers;
	mapping (address => bool) private _isAllowedToTradeWhenDisabled;
	mapping (address => bool) private _feeOnSelectedWalletTransfers;
	mapping (address => bool) private _isExcludedFromFee;
	mapping (address => bool) private _isExcludedFromMaxWalletLimit;
	mapping (address => bool) private _isExcludedFromMaxTransactionLimit;
	mapping (address => bool) public automatedMarketMakerPairs;
	mapping (address => bool) private _isBlocked;

	uint8 private _liquidityFee;
	uint8 private _operationsFee;
	uint8 private _buyBackFee;
	uint8 private _charityFee;
	uint8 private _totalFee;

	event AutomatedMarketMakerPairChange(address indexed pair, bool indexed value);
	event UniswapV2RouterChange(address indexed newAddress, address indexed oldAddress);
	event AllowedWhenTradingDisabledChange(address indexed account, bool isExcluded);
	event WalletChange(string indexed walletIdentifier, address indexed newWallet, address indexed oldWallet);
	event FeeChange(string indexed identifier, uint8 liquidityFee, uint8 operationsFee, uint8 buyBackFee, uint8 charityFee);
	event CustomTaxPeriodChange(uint256 indexed newValue, uint256 indexed oldValue, string indexed taxType, bytes23 period);
	event BlockedAccountChange(address indexed holder, bool indexed status);
	event MaxWalletAmountChange(uint256 indexed newValue, uint256 indexed oldValue);
	event MaxTransactionAmountChange(uint256 indexed newValue, uint256 indexed oldValue);
	event MinTokenAmountBeforeSwapChange(uint256 indexed newValue, uint256 indexed oldValue);
    event ExcludeFromFeesChange(address indexed account, bool isExcluded);
	event ExcludeFromMaxWalletChange(address indexed account, bool isExcluded);
	event ExcludeFromMaxTransactionChange(address indexed account, bool isExcluded);
	event FeeOnWalletTransferChange(bool indexed newValue, bool indexed oldValue);
	event FeeOnSelectedWalletTransfersChange(address indexed account, bool newValue);
	event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived,uint256 tokensIntoLiqudity);
    event ClaimETHOverflow(uint256 amount);
	event FeesApplied(uint8 liquidityFee, uint8 operationsFee, uint8 buybackFee, uint8 charityFee, uint8 totalFee);

	constructor() ERC20(_name, _symbol) {
        liquidityWallet = owner();
        operationsWallet = owner();
	    buyBackWallet = owner();
		charityWallet = owner();

		IRouter _uniswapV2Router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); // Mainnet
		address _uniswapV2Pair = IFactory(_uniswapV2Router.factory()).createPair(
			address(this),
			_uniswapV2Router.WETH()
		);
		uniswapV2Router = _uniswapV2Router;
		uniswapV2Pair = _uniswapV2Pair;
		_setAutomatedMarketMakerPair(_uniswapV2Pair, true);

		_isExcludedFromFee[owner()] = true;
		_isExcludedFromFee[address(this)] = true;

		_isAllowedToTradeWhenDisabled[owner()] = true;
		_isAllowedToTradeWhenDisabled[address(this)] = true;

		_isExcludedFromMaxTransactionLimit[address(this)] = true;
		_isExcludedFromMaxTransactionLimit[owner()] = true;

		_isExcludedFromMaxWalletLimit[_uniswapV2Pair] = true;
		_isExcludedFromMaxWalletLimit[address(uniswapV2Router)] = true;
		_isExcludedFromMaxWalletLimit[address(this)] = true;
		_isExcludedFromMaxWalletLimit[owner()] = true;

		_mint(owner(), initialSupply);
	}

	receive() external payable {}

	// Setters
	function activateTrading() external onlyOwner {
		isTradingEnabled = true;
		if (_launchTimestamp == 0) {
			_launchTimestamp = block.timestamp;
			_launchBlockNumber = block.number;
		}
	}
	function deactivateTrading() external onlyOwner {
		isTradingEnabled = false;
	}
	function _setAutomatedMarketMakerPair(address pair, bool value) private {
		require(automatedMarketMakerPairs[pair] != value, "SCARDust: Automated market maker pair is already set to that value");
		automatedMarketMakerPairs[pair] = value;
		emit AutomatedMarketMakerPairChange(pair, value);
	}
	function excludeFromFees(address account, bool excluded) external onlyOwner {
		require(_isExcludedFromFee[account] != excluded, "SCARDust: Account is already the value of 'excluded'");
		_isExcludedFromFee[account] = excluded;
		emit ExcludeFromFeesChange(account, excluded);
	}
	function excludeFromMaxTransactionLimit(address account, bool excluded) external onlyOwner {
		require(_isExcludedFromMaxTransactionLimit[account] != excluded, "SCARDust: Account is already the value of 'excluded'");
		_isExcludedFromMaxTransactionLimit[account] = excluded;
		emit ExcludeFromMaxTransactionChange(account, excluded);
	}
	function excludeFromMaxWalletLimit(address account, bool excluded) external onlyOwner {
		require(_isExcludedFromMaxWalletLimit[account] != excluded, "SCARDust: Account is already the value of 'excluded'");
		_isExcludedFromMaxWalletLimit[account] = excluded;
		emit ExcludeFromMaxWalletChange(account, excluded);
	}
	function blockAccount(address account) external onlyOwner {
		require(!_isBlocked[account], "SCARDust: Account is already blocked");
		require((block.timestamp - _launchTimestamp) < _blockedTimeLimit, "SCARDust: Time to block accounts has expired");
		_isBlocked[account] = true;
		emit BlockedAccountChange(account, true);
	}
	function unblockAccount(address account) external onlyOwner {
		require(_isBlocked[account], "SCARDust: Account is not blocked");
		_isBlocked[account] = false;
		emit BlockedAccountChange(account, false);
	}
	function setWallets(address newLiquidityWallet, address newOperationsWallet, address newBuyBackWallet, address newCharityWallet) external onlyOwner {
		if(liquidityWallet != newLiquidityWallet) {
			require(newLiquidityWallet != address(0), "SCARDust: The liquidityWallet cannot be 0");
			emit WalletChange('liquidityWallet', newLiquidityWallet, liquidityWallet);
			liquidityWallet = newLiquidityWallet;
		}
		if(operationsWallet != newOperationsWallet) {
			require(newOperationsWallet != address(0), "SCARDust: The operationsWallet cannot be 0");
			emit WalletChange('operationsWallet', newOperationsWallet, operationsWallet);
			operationsWallet = newOperationsWallet;
		}
		if(buyBackWallet != newBuyBackWallet) {
			require(newBuyBackWallet != address(0), "SCARDust: The buyBackWallet cannot be 0");
			emit WalletChange('buyBackWallet', newBuyBackWallet, buyBackWallet);
			buyBackWallet = newBuyBackWallet;
		}
		if(charityWallet != newCharityWallet) {
			require(newCharityWallet != address(0), "SCARDust: The charityWallet cannot be 0");
			emit WalletChange('charityWallet', newCharityWallet, charityWallet);
			charityWallet = newCharityWallet;
		}
	}