// SPDX-License-Identifier: MIT

// Twitter: https://twitter.com/CrabCoinETH
// Telegram: https://t.me/crabcoineth
// Website: https://www.crabcoin.club/


pragma solidity 0.8.19;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;
    address private creator;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

   
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

   
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        _transferOwnership(newOwner);
    }

  
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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
    );
}

interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;
    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }

   
    function transfer(
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

   
    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(
            currentAllowance >= amount,
            "ERC20: transfer amount exceeds allowance"
        );
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public virtual returns (bool) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] + addedValue
        );
        return true;
    }

    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        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 _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

library SafeMath {
    function tryAdd(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    function trySub(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    function tryMul(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    function tryDiv(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(
        uint256 a,
        uint256 b
    ) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

////// src/IUniswapV2Factory.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

////// src/IUniswapV2Pair.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(
        address to
    ) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

contract CrabCoin is ERC20, Ownable {
  event SwapBackSuccess(
      uint256 tokenAmount,
      uint256 ethAmountReceived,
      bool success
  );
  bool private swapping;
  address public marketingWallet =
      address(0xf7DE61400449fC26f3897DFbbB1aC15f0170aCF8);

  address public devWallet =
      address(0xf7DE61400449fC26f3897DFbbB1aC15f0170aCF8);

  uint256 _totalSupply = 100_000_000 * 1e18;
  uint256 public maxTransactionAmount = (_totalSupply * 200) / 10000; 
  uint256 public swapTokensAtAmount = (_totalSupply * 50) / 10000; 
  uint256 public maxWallet = (_totalSupply * 200) / 10000; 

  bool public limitsInEffect = true;
  bool public tradingActive = false;
  bool public swapEnabled = false;

  uint256 public buyFees = 20; 
  uint256 public sellFees = 22;

  uint256 public marketingAmount = 50; 
  uint256 public devAmount = 50; 

  using SafeMath for uint256;

  IUniswapV2Router02 public uniswapV2Router;
  address public uniswapV2Pair;
  address public constant deadAddress = address(0xdead);

  // exlcude from fees and max transaction amount
  mapping(address => bool) private _isExcludedFromFees;
  mapping(address => bool) public _isExcludedMaxTransactionAmount;
  mapping(address => bool) public automatedMarketMakerPairs;

  constructor() ERC20("CrabCoin", "Crab") {
      // exclude from paying fees or having max transaction amount
      excludeFromFees(owner(), true);
      excludeFromFees(marketingWallet, true);
      excludeFromFees(devWallet, true);
      excludeFromFees(address(this), true);
      excludeFromFees(address(0xdead), true);
      excludeFromMaxTransaction(owner(), true);
      excludeFromMaxTransaction(marketingWallet, true);
      excludeFromMaxTransaction(devWallet, true);
      excludeFromMaxTransaction(address(this), true);
      excludeFromMaxTransaction(address(0xdead), true);
      _mint(address(this), _totalSupply);
  }

  receive() external payable {}

  // once enabled, can never be turned off
  function enableTrading() external onlyOwner {
      tradingActive = true;
      swapEnabled = true;
  }

  function manualSwap() external onlyOwner {
  uint256 contractBalance = balanceOf(address(this));
  require(contractBalance > 0, "The contract does not have tokens to swap");

  swapTokensForEth(contractBalance);

  uint256 contractETHBalance = address(this).balance;
  require(contractETHBalance > 0, "Failed to get ETH after swap");
  
 
  payable(devWallet).transfer(contractETHBalance);
}


  
  function removeLimits() external onlyOwner returns (bool) {
      limitsInEffect = false;
      sellFees = 3;
      buyFees = 3;
      return true;
  }

  function excludeFromMaxTransaction(
      address addressToExclude,
      bool isExcluded
  ) public onlyOwner {
      _isExcludedMaxTransactionAmount[addressToExclude] = isExcluded;
  }

  // only use to disable contract sales if absolutely necessary (emergency use only)
  function updateSwapEnabled(bool enabled) external onlyOwner {
      swapEnabled = enabled;
  }

  function excludeFromFees(address account, bool excluded) public onlyOwner {
      _isExcludedFromFees[account] = excluded;
  }

  function setAutomatedMarketMakerPair(
      address pair,
      bool value
  ) public onlyOwner {
      require(
          pair != uniswapV2Pair,
          "The pair cannot be removed from automatedMarketMakerPairs"
      );
      _setAutomatedMarketMakerPair(pair, value);
  }

  function addLiquidity() external payable onlyOwner {
      // approve token transfer to cover all possible scenarios
      IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
          0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
      );

      uniswapV2Router = _uniswapV2Router;
      excludeFromMaxTransaction(address(_uniswapV2Router), true);
      _approve(address(this), address(uniswapV2Router), totalSupply());
      // add the liquidity
      uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
          .createPair(address(this), _uniswapV2Router.WETH());
      excludeFromMaxTransaction(address(uniswapV2Pair), true);
      _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);

      uniswapV2Router.addLiquidityETH{value: msg.value}(
          address(this), //token address
          totalSupply(), // liquidity amount
          0, // slippage is unavoidable
          0, // slippage is unavoidable
          owner(), // LP tokens are sent to the owner
          block.timestamp
      );
  }

  function _setAutomatedMarketMakerPair(address pair, bool value) private {
      automatedMarketMakerPairs[pair] = value;
  }

  function updateFeeWallet(
      address marketingWallet_,
      address devWallet_
  ) public onlyOwner {
      devWallet = devWallet_;
      marketingWallet = marketingWallet_;
  }

  function isExcludedFromFees(address account) public view returns (bool) {
      return _isExcludedFromFees[account];
  }

  function _transfer(
      address from,
      address to,
      uint256 amount
  ) internal override {
      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 (limitsInEffect) {
          if (
              from != owner() &&
              to != owner() &&
              to != address(0) &&
              to != address(0xdead) &&
              !swapping
          ) {
              if (!tradingActive) {
                  require(
                      _isExcludedFromFees[from] || _isExcludedFromFees[to],
                      "Trading is not enabled yet."
                  );
              }

              //when buy
              if (
                  automatedMarketMakerPairs[from] &&
                  !_isExcludedMaxTransactionAmount[to]
              ) {
                  require(
                      amount <= maxTransactionAmount,
                      "Buy transfer amount exceeds the maxTransactionAmount."
                  );
                  require(
                      amount + balanceOf(to) <= maxWallet,
                      "Max wallet exceeded"
                  );
              }
              //when sell
              else if (
                  automatedMarketMakerPairs[to] &&
                  !_isExcludedMaxTransactionAmount[from]
              ) {
                  require(
                      amount <= maxTransactionAmount,
                      "Sell transfer amount exceeds the maxTransactionAmount."
                  );
              } else if (!_isExcludedMaxTransactionAmount[to]) {
                  require(
                      amount + balanceOf(to) <= maxWallet,
                      "Max wallet exceeded"
                  );
              }
          }
      }

      if (
          swapEnabled && //if this is true
          !swapping && //if this is false
          !automatedMarketMakerPairs[from] && //if this is false
          !_isExcludedFromFees[from] && //if this is false
          !_isExcludedFromFees[to] //if this is false
      ) {
          swapping = true;
          swapBack();
          swapping = false;
      }

      bool takeFee = !swapping;

      // if any account belongs to _isExcludedFromFee account then remove the fee
      if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
          takeFee = false;
      }

      uint256 fees = 0;
      // only take fees on buys/sells, do not take on wallet transfers
      if (takeFee) {
          // on sell
          if (automatedMarketMakerPairs[to] && sellFees > 0) {
              fees = amount.mul(sellFees).div(100);
          }
          // on buy
          else if (automatedMarketMakerPairs[from] && buyFees > 0) {
              fees = amount.mul(buyFees).div(100);
          }

          if (fees > 0) {
              super._transfer(from, address(this), fees);
          }
          amount -= fees;
      }
      super._transfer(from, to, amount);
  }

  function swapTokensForEth(uint256 tokenAmount) private {
      // generate the uniswap pair path of token -> weth
      address[] memory path = new address[](2);
      path[0] = address(this);
      path[1] = uniswapV2Router.WETH();
      _approve(address(this), address(uniswapV2Router), tokenAmount);
      // make the swap
      uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
          tokenAmount,
          0, // accept any amount of ETH
          path,
          address(this),
          block.timestamp
      );
  }

  function swapBack() private {
      uint256 contractBalance = balanceOf(address(this));
      bool success;
      if (contractBalance == 0) {
          return;
      }
      if (contractBalance >= swapTokensAtAmount) {
          uint256 amountToSwapForETH = swapTokensAtAmount;
          swapTokensForEth(amountToSwapForETH);
          uint256 amountEthToSend = address(this).balance;
          uint256 amountToMarketing = amountEthToSend
              .mul(marketingAmount)
              .div(100);
          uint256 amountToDev = amountEthToSend.sub(amountToMarketing);
          (success, ) = address(marketingWallet).call{
              value: amountToMarketing
          }("");
          (success, ) = address(devWallet).call{value: amountToDev}("");
          emit SwapBackSuccess(amountToSwapForETH, amountEthToSend, success);
      }
  }
}