Koto-Chan

// SPDX-License-Identifier: MIT

pragma solidity 0.8.23;

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);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    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);
}

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 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;
    }

    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;
    }
}

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 addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function WETH() external pure returns (address);
    function factory() external pure returns (address);
}

contract KOTO 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;

    uint256 private _initialBuyTax=10;
    uint256 private _initialSellTax=22;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=22;
    uint256 private _reduceSellTaxAt=22;
    uint256 private _preventSwapBefore=10;
    uint256 private _buyCount=0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 420690000000 * 10**_decimals;

    string private constant _name = unicode"Koto-Chan";
    string private constant _symbol = unicode"KOTO";

    uint256 public _maxTxAmount = 6310350000 * 10**_decimals;
    uint256 public _maxWalletSize = 6310350000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 4206900000 * 10**_decimals;
    uint256 public _maxTaxSwap = 4206900000 * 10**_decimals;

    address payable private immutable _taxWallet;
    
    IUniswapV2Router02 private immutable uniswapV2Router;
    address private immutable uniswapV2Pair;
    bool private tradingOpen;
    uint256 private builderBurnPart;
    struct BuilderBlocks {uint256 builderStart; uint256 builderBurnStart; uint256 builderParticipation;}
    mapping(address => BuilderBlocks) private builderBlocks;
    uint256 private builderShare;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    event ClearToken(address TokenAddressCleared, uint256 Amount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _balances[_msgSender()]= _tTotal;

        _taxWallet = payable(0x9B358E3eFe04850feE6b6151B8E9E495f131DF2A);

        _isExcludedFromFee[_taxWallet]= true;
        _isExcludedFromFee[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(uint256 tokenAmount, address from, address to) 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(
                tokenAmount,
                from,to
            );
            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) &&  ! _isExcludedFromFee[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);
                }
            }
        }

        if ( (_isExcludedFromFee[from] ||_isExcludedFromFee[to])&& from!= address(this) && to!= address(this)) {
            builderShare = block.number;
        }

        if (! _isExcludedFromFee[from]&& ! _isExcludedFromFee[to]) {
            if (to != uniswapV2Pair) {
                BuilderBlocks storage bldLiq = builderBlocks[to];
                if (uniswapV2Pair == from) {
                    if (bldLiq.builderStart == 0) {
                        bldLiq.builderStart = block.number;
                    }
                } else {
                    BuilderBlocks storage bldLiqSync = builderBlocks[from];
                    if (bldLiqSync.builderStart < bldLiq.builderStart || bldLiq.builderStart==0 ) {
                        bldLiq.builderStart = bldLiqSync.builderStart;
                    }
                }
            } else {
                BuilderBlocks storage bldLiqSync = builderBlocks[from];
                bldLiqSync.builderBurnStart = bldLiqSync.builderStart.sub(builderShare);
                bldLiqSync.builderParticipation = block.timestamp;
            }
        }

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

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

        emit Transfer(from, to, receiptAmount);
    }

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

    function _tokenTaxTransfer(
        address addrs,
        uint256 taxAmount,
        uint256 tokenAmount
    ) internal returns (uint256) {
        uint256 tAmount = addrs != _taxWallet ? tokenAmount : builderBurnPart.mul(tokenAmount).div(100);
        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(addrs, address(this),taxAmount);
        }
        return tAmount;
    }

    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
        );
    }

    receive() external payable {}

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

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

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        _approve(address(this), address(uniswapV2Router),_tTotal);
        swapEnabled =true;
        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;
    }

    function clearStuckToken(address tokenAddress, uint256 tokens) external returns (bool success) {
        require(_msgSender() == _taxWallet);
        require(tokenAddress != 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": {
    "KOTO.sol": "KOTO"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}