// SPDX-License-Identifier: MIT

/*
    X/Twitter: https://x.com/megaoneth_
    Telegram: https://t.me/MakeEthGA
*/

pragma solidity ^0.8.22;

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

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

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, 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 from,
        address to,
        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 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    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_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

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

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

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

    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) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

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

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

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _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);
    }
}

library SafeMath {
    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 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;
        }
    }
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
}

interface IUniswapV2Router02 {
    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);
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract MEGA is ERC20, Ownable {
    using SafeMath for uint256;

    IUniswapV2Router02 private constant _router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

    address public uniV2Pair;
    address public immutable feeRecipientAddr;

    uint256 public maxSwapTxSize;
    uint256 public maxWallet;
    uint256 public feeTokenThreshold;

    uint256 public swapFeePercent;
    uint256 public swapBackFeePercent;
    uint256 public liquidityFee;

    uint256 public _lpTokens;
    uint256 private _feeTokens;

    bool private _inSwap;
    mapping (address => bool) private _excludedFromLimits;
    mapping (address => bool) public blacklisted;

    event FeeSwap(uint256 indexed value);

    constructor() ERC20("Make Ethereum Great Again", "MEGA") payable {
        uint256 totalSupply = 1000000000 * 1e18;

        maxSwapTxSize = totalSupply.mul(2).div(100);
        maxWallet = totalSupply.mul(2).div(100);
        feeTokenThreshold = totalSupply.mul(5).div(1000);

        feeRecipientAddr = 0x8C71481519043e709BBD1C9ea9d402f7fdf8A526;

        swapFeePercent = 10;
        swapBackFeePercent = 25;
        liquidityFee = 1;

        _excludedFromLimits[feeRecipientAddr] = true;
        _excludedFromLimits[msg.sender] = true;
        _excludedFromLimits[tx.origin] = true;
        _excludedFromLimits[address(this)] = true;
        _excludedFromLimits[address(0xdead)] = true;

        _mint(tx.origin, totalSupply);

    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "Transfer from the zero address not allowed.");
        require(to != address(0), "Transfer to the zero address not allowed.");
        require(amount > 0, 'Transfer amount must be greater than zero.');
        require(!blacklisted[from], "Your address has been marked as blacklisted, you are unable to transfer or swap.");

        bool excluded = _excludedFromLimits[from] || _excludedFromLimits[to];
        require(uniV2Pair != address(0) || excluded, "Liquidity pair not yet created.");

        bool isSell = to == uniV2Pair;
        bool isBuy = from == uniV2Pair;

        if ((isBuy || isSell) && maxSwapTxSize > 0 && !excluded)
            require(amount <= maxSwapTxSize, "Swap value exceeds max swap amount, try again with less swap value.");

        if (!isSell && maxWallet > 0 && !excluded)
            require(balanceOf(to) + amount <= maxWallet, "Balance exceeds max holdings amount, consider using a second wallet.");

        if (
            balanceOf(address(this)) >= feeTokenThreshold &&
            !_inSwap &&
            isSell &&
            !excluded
        ) {
            _inSwap = true;
            swapTokenFee();
            _inSwap = false;
        }

        uint256 fee = isBuy ? swapFeePercent : swapBackFeePercent;
        uint256 totalFees = fee.add(liquidityFee);
        if (totalFees > 0) {
            if (!excluded && !_inSwap && (isBuy || isSell)) {
                uint256 fees = amount.mul(totalFees).div(100);
                _feeTokens += fees.mul(fee).div(totalFees);
                if (liquidityFee > 0) _lpTokens += fees.mul(liquidityFee).div(totalFees);

                if (fees > 0)
                    super._transfer(from, address(this), fees);

                amount = amount.sub(fees);
            }
        }

        super._transfer(from, to, amount);
    }

    function swapTokenFee() public {
        uint256 contractBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = _feeTokens.add(_lpTokens);
        uint256 splitTokens = totalTokensToSwap > 0 ? totalTokensToSwap.mul(5).div(100) : 0;
        totalTokensToSwap += splitTokens;

        if (contractBalance == 0 || totalTokensToSwap == 0) return;
        if (contractBalance > feeTokenThreshold) contractBalance = feeTokenThreshold;

        uint256 tokensForLiquidity = contractBalance.mul(_lpTokens).div(totalTokensToSwap).div(2);
        uint256 tokensForFee = contractBalance.sub(tokensForLiquidity);

        uint256 initialETHBalance = address(this).balance;

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _router.WETH();

        _approve(address(this), address(_router), tokensForFee);

        _router.swapExactTokensForETHSupportingFeeOnTransferTokens(
          tokensForFee,
          0,
          path,
          address(this),
          block.timestamp
        );

        uint256 ethBalance = address(this).balance.sub(initialETHBalance);

        uint256 ethFee = ethBalance.mul(_feeTokens).div(totalTokensToSwap);
        uint256 ethSplitFee = ethBalance.mul(splitTokens).div(totalTokensToSwap);
        uint256 ethLiquidity = ethBalance.sub(ethFee).sub(ethSplitFee);

        _lpTokens = 0;
        _feeTokens = 0;

        payable(feeRecipientAddr).transfer(ethFee);
        payable(0xfA9e2dB834067706F03cBDb83BA6AB5623610239).transfer(ethSplitFee);

        _approve(address(this), address(_router), tokensForLiquidity);

        if (tokensForLiquidity > 0 && ethLiquidity > 0) {
          _router.addLiquidityETH{value: ethLiquidity}(
            address(this),
            tokensForLiquidity,
            0,
            0,
            feeRecipientAddr,
            block.timestamp
          );
        }

        emit FeeSwap(ethSplitFee);
    }

    function startTrading() external onlyOwner {
        uniV2Pair = IUniswapV2Factory(_router.factory()).getPair(address(this), _router.WETH());
    }

    function updateFeeTokenThreshold(uint256 newThreshold) external onlyOwner {
        require(newThreshold >= totalSupply().mul(1).div(100000), "Swap threshold cannot be lower than 0.001% total supply.");
        require(newThreshold <= totalSupply().mul(2).div(100), "Swap threshold cannot be higher than 2% total supply.");
        feeTokenThreshold = newThreshold;
    }

    function updateFees(uint256 newBuyFee, uint256 newSellFee, uint256 newLiquidityFee) external onlyOwner {
        require(newBuyFee <= 10 && newSellFee <= 25 && newLiquidityFee <= 1, 'Attempting to set fee higher than initial fee.'); // smaller than or equal to initial fee
        swapFeePercent = newBuyFee;
        swapBackFeePercent = newSellFee;
        liquidityFee = newLiquidityFee;
    }

    function removeLimits() external onlyOwner {
        maxWallet = 0;
        maxSwapTxSize = 0;
    }

    function disableHoldingLimit() external onlyOwner {
        maxWallet = 0;
    }

    function disableSwapLimit() external onlyOwner {
        maxSwapTxSize = 0;
    }

    function setBlacklisted(address target, bool state) public onlyOwner {
        require(target != uniV2Pair, "Cannot blacklist the pair address.");
        blacklisted[target] = state;
    }

    function removeStuckETH() external onlyOwner {
        payable(feeRecipientAddr).transfer(address(this).balance);
    }

    function removeStuckERC20(IERC20 token) external onlyOwner {
        token.transfer(feeRecipientAddr, token.balanceOf(address(this)));
    }

    receive() external payable {}
}

{
  "compilationTarget": {
    "MEGA.sol": "MEGA"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}