// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

library SafeMath {
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address to, 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    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 to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 += amount;
        unchecked {
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(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 _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2Router01 {
    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 removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    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 Shibapad is Context, ERC20, Ownable {
    using SafeMath for uint256;

    IUniswapV2Router02 private _uniswapV2Router02;

    mapping (address => bool) private _excludedFees;
    mapping (address => bool) private _excludedMaxTx;

    bool public tradingEnabled;
    bool private _swapping;
    bool public swapEnabled = false;

    uint256 private constant _tSupply = 1_000_000_000_000_000 ether;

    uint256 public maxSell = _tSupply;
    uint256 public maxWallet = _tSupply;

    uint256 private _fee;

    uint256 public buyFee = 5;
    uint256 private _previousBuyFee = buyFee;

    uint256 public sellFee = 5;
    uint256 private _previousSellFee = sellFee;

    uint256 private _tokensForFee;
    uint256 private _swapTokensAtAmount = 0;

    address payable private _feeReceiver = payable(0x20fB8a45f7B79024C85Dfbae2916D82b1b81eF95);

    address private _uniswapV2Pair;

    modifier lockTheSwap {
        _swapping = true;
        _;
        _swapping = false;
    }
    
    constructor() ERC20("Shibapad", "SPAD") {
        _uniswapV2Router02 = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(_uniswapV2Router02), _tSupply);
        _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router02.factory()).createPair(address(this), _uniswapV2Router02.WETH());
        IERC20(_uniswapV2Pair).approve(address(_uniswapV2Router02), type(uint).max);

        _excludedFees[owner()] = true;
        _excludedFees[address(this)] = true;
        _excludedFees[address(0)] = true;
        _excludedFees[address(0xdead)] = true;

        _excludedMaxTx[owner()] = true;
        _excludedMaxTx[address(this)] = true;
        _excludedMaxTx[address(0)] = true;
        _excludedMaxTx[address(0xdead)] = true;

        _mint(owner(), _tSupply);
    }

    function _transfer(address from, address to, uint256 amount) internal override {
        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");

        bool takeFee = true;
        bool shouldSwap = false;
        if (from != owner() && to != owner() && to != address(0) && to != address(0xdead) && !_swapping) {

            if(!tradingEnabled) {
                require(_excludedFees[from] || _excludedFees[to]);
            }

            if (from == _uniswapV2Pair && to != address(_uniswapV2Router02) && !_excludedMaxTx[to]) {
                require(balanceOf(to) + amount <= maxWallet);
            }
            
            if (to == _uniswapV2Pair && from != address(_uniswapV2Router02) && !_excludedMaxTx[from]) {
                require(amount <= maxSell);
                shouldSwap = true;
            }
        }

        if(_excludedFees[from] || _excludedFees[to]) {
            takeFee = false;
        }

        uint256 contractBalance = balanceOf(address(this));
        bool canSwap = (contractBalance > _swapTokensAtAmount) && shouldSwap;

        if (canSwap && swapEnabled && !_swapping && !_excludedFees[from] && !_excludedFees[to]) {
            _swapBack(contractBalance);
        }

        _tokenTransfer(from, to, amount, takeFee, shouldSwap);
    }

    function _swapBack(uint256 contractBalance) internal lockTheSwap {
        
        if (contractBalance == 0 || _tokensForFee == 0) {
            return;
        } else if (contractBalance > _swapTokensAtAmount.mul(5)) {
            contractBalance = _swapTokensAtAmount.mul(5);
        }

        _swapTokensForETH(contractBalance);
        
        _tokensForFee = 0;

        (bool success,) = address(_feeReceiver).call{value: address(this).balance}("");
    }

    function _swapTokensForETH(uint256 tokenAmount) internal {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _uniswapV2Router02.WETH();
        _approve(address(this), address(_uniswapV2Router02), tokenAmount);
        _uniswapV2Router02.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
        
    function _sendETHToFee(uint256 amount) internal {
        _feeReceiver.transfer(amount);
    }

    function initialize() public onlyOwner {
        require(!tradingEnabled);
        swapEnabled = true;
        maxSell = _tSupply.mul(1).div(100);
        maxWallet = _tSupply.mul(2).div(100);
        _swapTokensAtAmount = _tSupply.mul(5).div(10000);
        tradingEnabled = true;
    }

    function updateSwapEnabled(bool booly) public onlyOwner {
        swapEnabled = booly;
    }

    function updateMaxSell(uint256 _maxSell) public onlyOwner {
        require(_maxSell >= (totalSupply().mul(1).div(1000)));
        maxSell = _maxSell;
    }
    
    function updateMaxWallet(uint256 _maxWallet) public onlyOwner {
        require(_maxWallet >= (totalSupply().mul(1).div(1000)));
        maxWallet = _maxWallet;
    }
    
    function updateSwapTokensAtAmount(uint256 swapTokensAtAmount) public onlyOwner {
        require(swapTokensAtAmount >= (totalSupply().mul(1).div(100000)));
        require(swapTokensAtAmount <= (totalSupply().mul(5).div(1000)));
        _swapTokensAtAmount = swapTokensAtAmount;
    }

    function updateFeeReceiver(address feeReceiver) public onlyOwner {
        require(feeReceiver != address(0));
        _feeReceiver = payable(feeReceiver);
        _excludedFees[_feeReceiver] = true;
        _excludedMaxTx[_feeReceiver] = true;
    }

    function excludeFees(address[] memory accounts, bool booly) public onlyOwner {
        for (uint i = 0; i < accounts.length; i++) {
            _excludedFees[accounts[i]] = booly;
        }
    }
    
    function excludeMaxTx(address[] memory accounts, bool booly) public onlyOwner {
        for (uint i = 0; i < accounts.length; i++) {
            _excludedMaxTx[accounts[i]] = booly;
        }
    }

    function updateBuyFee(uint256 _buyFee) public onlyOwner {
        require(_buyFee <= 12);
        buyFee = _buyFee;
    }

    function updateSellFee(uint256 _sellFee) public onlyOwner {
        require(_sellFee <= 12);
        sellFee = _sellFee;
    }

    function _shutdownFee() internal {
        if (buyFee == 0 && sellFee == 0) {
            return;
        }

        _previousBuyFee = buyFee;
        _previousSellFee = sellFee;
        
        buyFee = 0;
        sellFee = 0;
    }
    
    function _turnOnFee() internal {
        buyFee = _previousBuyFee;
        sellFee = _previousSellFee;
    }
        
    function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFee, bool isSell) internal {
        if (!takeFee) {
            _shutdownFee();
        } else {
            amount = _takeFees(sender, amount, isSell);
        }

        super._transfer(sender, recipient, amount);
        
        if (!takeFee) {
            _turnOnFee();
        }
    }

    function _takeFees(address sender, uint256 amount, bool isSell) internal returns (uint256) {
        if (isSell) {
            _fee = sellFee;
        } else {
            _fee = buyFee;
        }
        
        uint256 fees;
        if (_fee > 0) {
            fees = amount.mul(_fee).div(100);
            _tokensForFee += fees * _fee / _fee;
        }

        if (fees > 0) super._transfer(sender, address(this), fees);

        return amount -= fees;
    }

    function rescueETH() public onlyOwner {
        (bool success, ) = address(msg.sender).call{value: address(this).balance}("");
    }

    function rescueForeignTokens(address tkn) public onlyOwner {
        require(tkn != address(this));
        require(IERC20(tkn).balanceOf(address(this)) > 0);
        uint amount = IERC20(tkn).balanceOf(address(this));
        IERC20(tkn).transfer(msg.sender, amount);
    }

    receive() external payable {}
    fallback() external payable {}

}