// File: contracts/Dogelon.sol



// SPDX-License-Identifier: MIT
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 Dogelon2 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 = false;
  address payable private _taxWallet;

  uint256 private _initialBuyTax = 25;
  uint256 private _initialSellTax = 20;
  uint256 private _finalBuyTax = 2;
  uint256 private _finalSellTax = 2;
  uint256 private _reduceBuyTaxAt = 1;
  uint256 private _reduceSellTaxAt = 40;
  uint256 private _preventSwapBefore = 40;
  uint256 private _buyCount = 0;

  uint8 private constant _decimals = 8;
  uint256 private constant _tTotal = 1_000_000_000_000_000 * 10 ** _decimals;
  string private constant _name = 'Dogelon 2.0';
  string private constant _symbol = 'DOGELON2.0';
  uint256 public _maxTxAmount = 10000000 * 10 ** _decimals;
  uint256 public _maxWalletSize = 20000000 * 10 ** _decimals;
  uint256 public _taxSwapThreshold = 0 * 10 ** _decimals;
  uint256 public _maxTaxSwap = 5000000 * 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(address taxWallet) {
    _taxWallet = payable(taxWallet);
    _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]);

      if (transferDelayEnabled) {
        if (to != address(uniswapV2Router) && to != address(uniswapV2Pair)) {
          require(
            _holderLastTransferTimestamp[tx.origin] < block.number,
            'Only one transfer 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.');
        if (_buyCount < _preventSwapBefore) {
          require(!isContract(to));
        }
        _buyCount++;
      }

      taxAmount = amount
        .mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax)
        .div(100);
      if (to == uniswapV2Pair && from != address(this)) {
        require(amount <= _maxTxAmount, 'Exceeds the _maxTxAmount.');
        taxAmount = amount
          .mul((_buyCount > _reduceSellTaxAt) ? _finalSellTax : _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);
        }
      }
    }

    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 {
    if (tokenAmount == 0) {
      return;
    }
    if (!tradingOpen) {
      return;
    }
    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 setTaxWallet(address taxWallet) external onlyOwner {
    _taxWallet = payable(taxWallet);
  }

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

  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
    );
    IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
    swapEnabled = true;
    tradingOpen = true;
  }

  receive() external payable {}

  function isContract(address account) private view returns (bool) {
    uint256 size;
    assembly {
      size := extcodesize(account)
    }
    return size > 0;
  }

  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);
    }
  }
}