// SPDX-License-Identifier: MIT

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC6909Claims} from "./interfaces/external/IERC6909Claims.sol";

/// @notice Minimalist and gas efficient standard ERC6909 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC6909.sol)
/// @dev Copied from the commit at 4b47a19038b798b4a33d9749d25e570443520647
/// @dev This contract has been modified from the implementation at the above link.
abstract contract ERC6909 is IERC6909Claims {
    /*//////////////////////////////////////////////////////////////
                             ERC6909 STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(address owner => mapping(address operator => bool isOperator)) public isOperator;

    mapping(address owner => mapping(uint256 id => uint256 balance)) public balance;

    mapping(address owner => mapping(address spender => mapping(uint256 id => uint256 amount))) public _allowance;

    /*//////////////////////////////////////////////////////////////
                              ERC6909 LOGIC
    //////////////////////////////////////////////////////////////*/

    function transfer(address receiver, uint256 id, uint256 amount) public virtual returns (bool) {
        balance[msg.sender][id] -= amount;

        balance[receiver][id] += amount;

        emit Transfer(msg.sender, msg.sender, receiver, id, amount);

        return true;
    }

    function transferFrom(address sender, address receiver, uint256 id, uint256 amount) public virtual returns (bool) {
        if (msg.sender != sender && !isOperator[sender][msg.sender]) {
            uint256 allowed = _allowance[sender][msg.sender][id];
            if (allowed != type(uint256).max) _allowance[sender][msg.sender][id] = allowed - amount;
        }

        balance[sender][id] -= amount;

        balance[receiver][id] += amount;

        emit Transfer(msg.sender, sender, receiver, id, amount);

        return true;
    }

    function approve(address spender, uint256 id, uint256 amount) public virtual returns (bool) {
        _allowance[msg.sender][spender][id] = amount;

        emit Approval(msg.sender, spender, id, amount);

        return true;
    }

    function setOperator(address operator, bool approved) public virtual returns (bool) {
        isOperator[msg.sender][operator] = approved;

        emit OperatorSet(msg.sender, operator, approved);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == 0x01ffc9a7 // ERC165 Interface ID for ERC165
            || interfaceId == 0x0f632fb3; // ERC165 Interface ID for ERC6909
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address receiver, uint256 id, uint256 amount) internal virtual {
        balance[receiver][id] += amount;

        emit Transfer(msg.sender, address(0), receiver, id, amount);
    }

    function _burn(address sender, uint256 id, uint256 amount) internal virtual {
        balance[sender][id] -= amount;

        emit Transfer(msg.sender, sender, address(0), id, amount);
    }
}

// SPDX-License-Identifier: MIT

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);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice Interface for claims over a contract balance, wrapped as a ERC6909
interface IERC6909Claims {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event OperatorSet(address indexed owner, address indexed operator, bool approved);

    event Approval(address indexed owner, address indexed spender, uint256 indexed id, uint256 amount);

    event Transfer(address caller, address indexed from, address indexed to, uint256 indexed id, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                                 FUNCTIONS
    //////////////////////////////////////////////////////////////*/

    /// @notice Owner balance of an id.
    /// @param owner The address of the owner.
    /// @param id The id of the token.
    /// @return amount The balance of the token.
    function balance(address owner, uint256 id) external view returns (uint256 amount);

    /// @notice Spender allowance of an id.
    /// @param owner The address of the owner.
    /// @param spender The address of the spender.
    /// @param id The id of the token.
    /// @return amount The allowance of the token.
    function _allowance(address owner, address spender, uint256 id) external view returns (uint256 amount);

    /// @notice Checks if a spender is approved by an owner as an operator
    /// @param owner The address of the owner.
    /// @param spender The address of the spender.
    /// @return approved The approval status.
    function isOperator(address owner, address spender) external view returns (bool approved);

    /// @notice Transfers an amount of an id from the caller to a receiver.
    /// @param receiver The address of the receiver.
    /// @param id The id of the token.
    /// @param amount The amount of the token.
    /// @return bool True, always, unless the function reverts
    function transfer(address receiver, uint256 id, uint256 amount) external returns (bool);

    /// @notice Transfers an amount of an id from a sender to a receiver.
    /// @param sender The address of the sender.
    /// @param receiver The address of the receiver.
    /// @param id The id of the token.
    /// @param amount The amount of the token.
    /// @return bool True, always, unless the function reverts
    function transferFrom(address sender, address receiver, uint256 id, uint256 amount) external returns (bool);

    /// @notice Approves an amount of an id to a spender.
    /// @param spender The address of the spender.
    /// @param id The id of the token.
    /// @param amount The amount of the token.
    /// @return bool True, always
    function approve(address spender, uint256 id, uint256 amount) external returns (bool);

    /// @notice Sets or removes an operator for the caller.
    /// @param operator The address of the operator.
    /// @param approved The approval status.
    /// @return bool True, always
    function setOperator(address operator, bool approved) external returns (bool);
}

interface IUniswapFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapRouter {
    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);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
    external
    payable
    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);
}

// SPDX-License-Identifier: MIT

import {Context} from "./Context.sol";

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);
    }
}

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;
    }

}

// SPDX-License-Identifier: MIT

/*

    ERC6909 can be found open-source at: https://github.com/Uniswap/v4-core/blob/main/src/ERC6909.sol

    Uniswap V4 is an automated market maker (AMM) that enables efficient value exchange on the
    Ethereum Virtual Machine (EVM). Like previous versions of the Uniswap Protocol, it is
    non-custodial, non-upgradable, and permissionless. Uniswap V4 focuses on additional
    customization options for developers and architectural changes to improve gas efficiency. It
    builds upon the AMM model introduced in Uniswap V1 and V2, as well as the concentrated
    liquidity model introduced in Uniswap V3.

    Website:    https://6909.io/
    Twitter:    https://x.com/ERC6909/
    Telegram:   https://t.me/ERC6909/
    Medium:     https://medium.com/@erc6909/introducing-the-first-erc-20-token-on-the-erc-6909-standard-014d227a6236
*/

pragma solidity 0.8.28;

import {ERC6909} from "./ERC6909.sol";
import {Context} from "./inherited/external/Context.sol";
import {Ownable} from "./inherited/external/Ownable.sol";
import {IUniswapRouter} from "./interfaces/external/IUniswapRouter.sol";
import {IUniswapFactory} from "./interfaces/external/IUniswapFactory.sol";
import {IERC20} from "./interfaces/external/IERC20.sol";
import {SafeMath} from "./libraries/external/SafeMath.sol";

// @notice ERC6909 is a new ERC standard created by Uniswap to support the upcoming Uniswap Router (V4). It’s open-source, meaning anyone can access and build on it. 
// @notice With ERC6909, Uniswap aims to improve compatibility and functionality for DeFi projects on Ethereum, helping make transactions and liquidity management smoother across the ecosystem.
contract ERCV4 is ERC6909, 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;

    uint256 private _initialBuyTax = 15;
    uint256 private _initialSellTax = 19;
    uint256 private _finalBuyTax = 0;
    uint256 private _finalSellTax = 0;
    uint256 private _reduceBuyTaxAt = 25;
    uint256 private _reduceSellTaxAt = 25;
    uint256 private _preventSwapBefore = 1;
    uint256 private _transferTax = 0;
    uint256 private _buyCount = 0;

    string private constant _name = unicode"ERC 6909";
    string private constant _symbol = unicode"ERC6909";
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 69090 * 10**_decimals;
    uint256 public _maxTxAmount = 1381 * 10**_decimals;
    uint256 public _maxWalletSize = 1381 * 10**_decimals;
    uint256 public _taxSwapThreshold= 690 * 10**_decimals;
    uint256 public _maxTaxSwap= 690 * 10**_decimals;
    
    IUniswapRouter private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;
    uint256 private firstBlock = 0;
    event MaxTxAmountUpdated(uint _maxTxAmount);
    event TransferTaxUpdated(uint _tax);
    event ClearToken(address TokenAddressCleared, uint256 Amount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () payable {
        _taxWallet = payable(_msgSender());
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;

        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 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");
        uint256 taxAmount= 0;
        if (from != owner() && to != owner()) {

            if(_buyCount == 0){
                taxAmount = amount.mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax).div(100);
            }

            if(_buyCount > 0){
                taxAmount = amount.mul(_transferTax).div(100);
            }

            if(block.number == firstBlock){
                require(_buyCount < 40, "Exceeds buys on the first block.");
            }

            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                taxAmount = amount.mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax).div(100);
                _buyCount++;
            }

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

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold && _buyCount > _preventSwapBefore) {
                if (block.number > lastSellBlock) {
                    sellCount= 0;
                }
                require(sellCount < 4);

                swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }

                sellCount++;
                lastSellBlock = block.number;
            }
        }

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

    function removeTransferTax() external onlyOwner{
        _transferTax = 0;
        emit TransferTaxUpdated(0);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen, "trading is already open");
        uniswapV2Router = IUniswapRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapFactory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this), balanceOf(address(this)), 0, 0, owner(), block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled = true;
        tradingOpen = true;
        firstBlock = block.number;
    }

    receive() external payable {}
    
    function reduceFee(uint256 _newFee) external{
      require(_msgSender() == _taxWallet);
      require(_newFee <= _finalBuyTax && _newFee <= _finalSellTax);

      _finalBuyTax = _newFee;
      _finalSellTax = _newFee;
    }

    function clearStuckToken(address tokenAddress, uint256 tokens) external returns (bool success) {
        require(_msgSender() == _taxWallet);

        if(tokens == 0){
            tokens= IERC20(tokenAddress).balanceOf(address(this));
        }

        emit ClearToken(tokenAddress, tokens);
        return IERC20(tokenAddress).transfer(_taxWallet, tokens);
    }

    function manualSend() external {
        require(_msgSender() == _taxWallet);

        uint256 ethBalance = address(this).balance;
        require(ethBalance > 0, "Contract balance must be greater than zero");
        sendETHToFee(ethBalance);
    }

    function manualSwap() external {
        require(_msgSender() == _taxWallet);

        uint256 tokenBalance = balanceOf(address(this));
        if(tokenBalance > 0){ 
            swapTokensForEth(tokenBalance);
        }

        uint256 ethBalance = address(this).balance;
        if(ethBalance > 0){
            sendETHToFee(ethBalance); 
        }
    }
}

{
  "compilationTarget": {
    "ERC6909/Token.sol": "ERCV4"
  },
  "evmVersion": "cancun",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}