// File: otaku.sol



/*❀
    ❀ Otaku Senpai ❀ $OTAKU
    ❀ https://otakusenpai.xyz/ ❀ https://t.me/otakusenpai
❀*/

// SPDX-License-Identifier: MIT

pragma solidity 0.8.15;

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;
    address private _previousOwner;
    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 OtakuSenpai is Context, IERC20, Ownable {  
     using SafeMath for uint256;
     mapping (address => uint256) private _rOwned;
     mapping (address => uint256) private _tOwned;
     mapping (address => mapping (address => uint256)) private _allowances;
     mapping (address => bool) private _isExcludedFromFee;
     mapping (address => bool) private bots;
     mapping (address => uint) private cooldown;
     uint256 private constant MAX = ~uint256(0);
     uint256 private constant _tTotal = 1000000000 * 10**18;
     uint256 private _rTotal = (MAX - (MAX % _tTotal));
     uint256 private _tFeeTotal;

     uint256 private _feeAddr1;
     uint256 private _feeAddr2;
     uint256 private _initialTax;
     uint256 private _finalTax;
     uint256 private _reduceTaxTarget;
     uint256 private _reduceTaxCountdown;
     address payable private _feeAddrWallet;

     string private constant _name = "Otaku Senpai";
     string private constant _symbol = "OTAKU";
     uint8 private constant _decimals = 8;

     IUniswapV2Router02 private uniswapV2Router;
     address private uniswapV2Pair;
     bool private tradingOpen;
     bool private inSwap = false;
     bool private swapEnabled = false;
     bool private cooldownEnabled = false;
     uint256 public _maxTxAmount = _tTotal.mul(10).div(1000); // 1%
     uint256 public _maxWalletSize = _tTotal.mul(20).div(1000); // 2%
     event MaxTxAmountUpdated(uint _maxTxAmount);
     modifier lockTheSwap {
          inSwap = true;
          _;
          inSwap = false;
     }

     constructor () {
          _feeAddrWallet = payable(_msgSender());
          _rOwned[_msgSender()] = _rTotal;
          _isExcludedFromFee[owner()] = true;
          _isExcludedFromFee[address(this)] = true;
          _isExcludedFromFee[_feeAddrWallet] = true;
          _initialTax=4; 
          _finalTax=2; 
          _reduceTaxCountdown=30;
          _reduceTaxTarget = _reduceTaxCountdown.div(2);
          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 tokenFromReflection(_rOwned[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 setCooldownEnabled(bool onoff) external onlyOwner() {
          cooldownEnabled = onoff;
     }

     function tokenFromReflection(uint256 rAmount) private view returns(uint256) {
          require(rAmount <= _rTotal, "Amount must be less than total reflections");
          uint256 currentRate =  _getRate();
          return rAmount.div(currentRate);
     }

     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");


          if (from != owner() && to != owner()) {
               require(!bots[from] && !bots[to]);
               _feeAddr1 = 0;
               _feeAddr2 = (_reduceTaxCountdown==0)?_finalTax:_initialTax;
               if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] && cooldownEnabled) {
                    // Cooldown
                    require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                    require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                    if(_reduceTaxCountdown>0){_reduceTaxCountdown--;}
               }


               uint256 contractTokenBalance = balanceOf(address(this));
               if (!inSwap && from != uniswapV2Pair && swapEnabled && contractTokenBalance>0 && _reduceTaxCountdown<_reduceTaxTarget) {
                    swapTokensForEth(contractTokenBalance);
                    uint256 contractETHBalance = address(this).balance;
                    if(contractETHBalance > 0) {
                         sendETHToFee(address(this).balance);
                    }
               }
          }else{
            _feeAddr1 = 0;
            _feeAddr2 = 0;
          }

          _tokenTransfer(from,to,amount);
     }

     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;
     }

     function sendETHToFee(uint256 amount) private {
          _feeAddrWallet.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 enableTrading() external onlyOwner() {
          require(!tradingOpen,"trading is already open");
          swapEnabled = true;
          cooldownEnabled = true;
          tradingOpen = true;
     }

     function _tokenTransfer(address sender, address recipient, uint256 amount) private {
          _transferStandard(sender, recipient, amount);
     }

     function _transferStandard(address sender, address recipient, uint256 tAmount) private {
          (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tTeam) = _getValues(tAmount);
          _rOwned[sender] = _rOwned[sender].sub(rAmount);
          _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
          _takeTeam(tTeam);
          _reflectFee(rFee, tFee);
          emit Transfer(sender, recipient, tTransferAmount);
     }

     function _takeTeam(uint256 tTeam) private {
          uint256 currentRate =  _getRate();
          uint256 rTeam = tTeam.mul(currentRate);
          _rOwned[address(this)] = _rOwned[address(this)].add(rTeam);
     }

     function _reflectFee(uint256 rFee, uint256 tFee) private {
          _rTotal = _rTotal.sub(rFee);
          _tFeeTotal = _tFeeTotal.add(tFee);
     }

     receive() external payable {}

     function manualswap() external {
          require(_msgSender() == _feeAddrWallet);
          uint256 contractBalance = balanceOf(address(this));
          swapTokensForEth(contractBalance);
     }

     function manualsend() external {
          require(_msgSender() == _feeAddrWallet);
          uint256 contractETHBalance = address(this).balance;
          sendETHToFee(contractETHBalance);
     }


     function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
          (uint256 tTransferAmount, uint256 tFee, uint256 tTeam) = _getTValues(tAmount, _feeAddr1, _feeAddr2);
          uint256 currentRate =  _getRate();
          (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tTeam, currentRate);
          return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tTeam);
     }

     function _getTValues(uint256 tAmount, uint256 taxFee, uint256 TeamFee) private pure returns (uint256, uint256, uint256) {
          uint256 tFee = tAmount.mul(taxFee).div(100);
          uint256 tTeam = tAmount.mul(TeamFee).div(100);
          uint256 tTransferAmount = tAmount.sub(tFee).sub(tTeam);
          return (tTransferAmount, tFee, tTeam);
     }

     function _getRValues(uint256 tAmount, uint256 tFee, uint256 tTeam, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
          uint256 rAmount = tAmount.mul(currentRate);
          uint256 rFee = tFee.mul(currentRate);
          uint256 rTeam = tTeam.mul(currentRate);
          uint256 rTransferAmount = rAmount.sub(rFee).sub(rTeam);
          return (rAmount, rTransferAmount, rFee);
     }

	function _getRate() private view returns(uint256) {
          (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
          return rSupply.div(tSupply);
     }

     function _getCurrentSupply() private view returns(uint256, uint256) {
          uint256 rSupply = _rTotal;
          uint256 tSupply = _tTotal;
          if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
          return (rSupply, tSupply);
     }
}