// SPDX-License-Identifier: MIT
/**

WALTER INU

Nelson the Bull Terrier, also known as Walter, refers to a picture of a dog looking at a camera without his ears showing. 
The image grew popular on Twitter and Reddit, particularly the /r/okbuddyretard subreddit, in late 2018.

Walter stood up from death to once again spread his hype and memes around the world

Join here:
Telegram: https://t.me/WalterETH
Twitter: https://twitter.com/WalterInuETH


^^^^^^^^^^^^^^^^!?!^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
::::::::::::::::^^^:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:::::::::::::^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^::^^^^^^^^^^^^^::::^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^::^!555555PPPPPPG?~!~::^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:::::^7YPYYYYY55YYYYYYJJJJ7~::^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:^!^^?YPYJJJJ55?~         :7JJ^:::^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:^!J55YJJJYYP7^   ..        :~Y?^^^^^^^^^^^^^:~7~:^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7G5YJJJJYBY.     7J.         .!B7:^^^^^^^^^^:^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJJJ55J!                   :J?7^:^^^^^^^^^:::^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJJJPG.     ^Y^          .J! YB^:^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^:!7^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJ5G7:      ~G~          .PJ YG^:^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJ5B~        .            .  YG^:^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJ5B~                        YG^:^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJY5YJ.              ....... JG~^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^::^^^^^^^^^^^^^^^^^^:7B5JJJJGG.            :^PPPYJJ7:::PY::^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^!~:^^^^^^^^^^^^^^^^^:7B5JJJJPG.  ~7::::::::YBBBBJ!!J#!:5Y?~:^^^^^^^:^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^:^!~:^^^^^^^^^^^^^^^^^:7B5JJJJPG.  YB~~^^::::!?GBGBBBP7~~7YB7:^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^::^^^^^^^^^^^^^^^^^^:7B5JJJJYYP? :^YY?!~~~~!7JYYPBYJ!7?GY~^:^^^^^:~7~:^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^:7B5JJJJJYBY   .~YYYJJYYY5PPPPP5JYY5?::^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^:^::^^^^^^^^^^^^^^^^^^:7B5JJJJJYBJ      ~?BGJJJ!!!!!!JB5?^:^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^7!::^^^^^^^^^^^^^^^^:7B5JJJJJYGJ        ^7YYYYYYYY5J!^::^^^^^^^::^^^^^^^^^^^^^^^
^^^^^^:::^^^^^^^^:!?J7^^:^^^^^:~7~:^^^::~JB5JJJJJJY5G~        :::::::^GY::^^^^^^^::^^^^^^^^^^::^^^^^
^^^^^:^!^:^^^^^^::7J???!~^:^^^^^^^^^^:!?JJJ55JJJJJJ5#~                GY::^^^^:::^~7?^:^^^^::~~^:^^^
^:::^!7J~:^^^^^:^7?????J?7~:^^^^^^^^^:5G.  ^755JJJJY5J?.            !J55Y~:^^:!7!7JJ?^:::^:~!?J7~:^^
^^^!?JJ??7?!:^^^!J???????J??~:::^^^^::~!5?   :7GYJJJJGG.            YBJ5B?^:::7JJJ????!^^^7?J??J7::^
:~??J???JJJ7::^????????????J!~~^:^::^7!7BY    ~B5JJJJ5P~:           JBYJY557~:7J?????J??!~?J???J7~^:
!7J???????J?!^^??????????????JJ7::^?YPPPPY7: !JPYJJJJJYBY         :7Y5YJJJYBY:7J?????????J???????J~:
J???????????J77???????????????J?77?GPJJJJ5B5YBPJJJJJJJYBJ         ~#5JYYYYYG57??????J?????????????77
???JJJJ??????JJJ7~~~~!J????JJJ??J5PYYJJJJYYPG5YJJJJJJJYGY:.       ~B5YYYY5Y:!B5Y?????~~~~~?J??????JJ
????77?JJ????J?7!^^^^!J??J?777~?B5JJJJJJJJJJYGPJJJJJJJJJ5B~       ~#BG7!7: :!PYJ5Y?!^~~^^~7?J???????
??J!^^~!?J???7!~^~~~~~!??7!^^^^?B5JJJJJJJJJJYGGPYJJJJJJJ5B~     .??!!!777??^~7~^!?P7^~~~~~^!J???????
??J!^~^^7??JJ!^~~~~~~~^7?~^^~!55YYJJJJJJJJJJJY5B5YJJJJJJ5B!.   .:GJ      :~J?:!7~?G?~~~~~~^!??J?????
??J!^~~~~~77?!^~~~~~~~~~~~~7YPYYJJJJJJJJJJJJJJYGGGYJJJJJJYPP.  JP:  :^^:   .!G~.7! JG~^~~~~~~7??JJJJ
??J7!~^~^~~~~~~~~~~~~~~^^^?B5JJJJJJJJJJJJJJJJJJJPGYJJJJJJJPG.  YG.:75BB57:  ~#~ 7~ JG~^~~~~~^^~77777
?????7!^~~~~~~~~~~~~~~~~~^?B5JJJJJJJJJ5PPPPPPPPPGGYJJJJJJJY5Y7 JG.~#BBBB#!  ~B~ 77~5G~^~~~~~~~~^^^^^
~~~~~~~~~~~~~~~~~~~~~~~^~PPYYJJJJJJJJJYYYYYYYYYYYYPPYYJJJJJYGY.YG.^PGBBGP~  ~B~ 777PG~^~~~~~~~~~~~~~
^^^^^^^~~~~~~~~~~~~~~~~^~BGJJJJJJJJJJJJJJJJJJJJJJJJ5B5JJJJJJJ5GBG.  7YY7    ~#7:777PG~^~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~^~?YPYJJJJJJJJJJJJJJJJJJJJJJ5B5JJJJJJJ5BBGJ!       .?JY?77?5J?~^~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~^7G5JJJJJJJJJJJJJJJJYYY5PPPYYJJJJJJJ5B5YBY.......:GP7777YB7^~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~J5JJJJJJJJY5555Y5PPP5YYYJJJJJJJJJ5B5JYYPPG5555Y?77?JG5~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~^?Y55555JY5PPPPPPPYJJJJJJJJJJJJJJJ5B5JJJJ5PYYYYYYYY5PB5^^~~~~~~~~~~~~~~~~
^^^^^^^^^^^^^^^^^^^^^^^^^^^~^^7????PP5YJJJJJJJJJJJJJJJJJJJJYPP5YJJJJJJ55555555YJB5^^^~^^^^^^^^^^^^^^
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~JP5YJYYYYYYYYYYYYYYYYYYYYYYBPJYYYYYYYYYJYYYYYYYB5~~~~~~~~~~~~~~~~~

**/
pragma solidity 0.8.17;

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);
    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);
}

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 WalterInu 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;
    mapping (address => bool) private bots;
    mapping(address => uint256) private _holderLastTransferTimestamp;
    bool public transferDelayEnabled = true;
    address payable private _taxWallet;

    uint256 private _initialBuyTax=12;
    uint256 private _initialSellTax=12;
    uint256 private _finalTax=5;
    uint256 private _reduceBuyTaxAt=35;
    uint256 private _reduceSellTaxAt=35;
    uint256 private _preventSwapBefore=15;
    uint256 private _buyCount=0;

    uint8 private constant _decimals = 8;
    uint256 private constant _tTotal = 1000000 * 10**_decimals;
    string private constant _name = unicode"Walter Inu";
    string private constant _symbol = unicode"WALTER";
    uint256 public _maxTxAmount =   20000 * 10**_decimals;
    uint256 public _maxWalletSize = 20000 * 10**_decimals;
    uint256 public _taxSwapThreshold=5000 * 10**_decimals;
    uint256 public _maxTaxSwap=20000 * 10**_decimals;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _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()) {
            require(!bots[from] && !bots[to]);
            taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalTax:_initialBuyTax).div(100);

            if (transferDelayEnabled) {
                  if (to != address(uniswapV2Router) && to != address(uniswapV2Pair)) {
                      require(
                          _holderLastTransferTimestamp[tx.origin] <
                              block.number,
                          "_transfer:: Transfer Delay enabled.  Only one purchase per block allowed."
                      );
                      _holderLastTransferTimestamp[tx.origin] = block.number;
                  }
              }

            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }

            if(to == uniswapV2Pair && from!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to   == uniswapV2Pair && swapEnabled && contractTokenBalance>_taxSwapThreshold && _buyCount>_preventSwapBefore) {
                swapTokensForEth(min(amount,min(contractTokenBalance,_maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
        if(taxAmount>0){
          _balances[address(this)]=_balances[address(this)].add(taxAmount);
          emit Transfer(from, address(this),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 removeLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        transferDelayEnabled=false;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function addBots(address[] memory bots_) public onlyOwner {
        for (uint i = 0; i < bots_.length; i++) {
            bots[bots_[i]] = true;
        }
    }

    function delBots(address[] memory notbot) public onlyOwner {
      for (uint i = 0; i < notbot.length; i++) {
          bots[notbot[i]] = false;
      }
    }

    function isBot(address a) public view returns (bool){
      return bots[a];
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        swapEnabled = true;
        tradingOpen = true;
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
    }

    
    function reduceFee(uint256 _newFee) external{
      require(_buyCount>200);
      require(_newFee<=_finalTax);
      _finalTax=_newFee;
    }

    receive() external payable {}

    function manualSwap() external {
        uint256 tokenBalance=balanceOf(address(this));
        if(tokenBalance>0){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }
}