/**
Welcome to the Memechain.

Website: https://meme-chain.vip/
Telegram: http://t.me/Memechaineth
Twitter: http://twitter.com/Memechaineth
*/
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

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
    );
}

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 transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    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(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function factory() external pure returns (address);

    function WETH() external pure returns (address);
}

contract Memechain is Context, IERC20, Ownable {
    mapping(address => uint256) private _balance;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => uint256) private _FreeWallets;
    uint256 private constant MAX = ~uint256(0);
    uint8 private constant _decimals = 18;
    uint256 private constant _totalSupply = 420_690_000_000_000 * 10 ** _decimals;
    uint256 private constant minimumSwapAmount = 3_306_900_000_000 * 10 ** _decimals;
    uint256 private constant onePercent = 6_306_900_000_000 * 10 ** _decimals;
    uint256 public maxTrxAmount = onePercent;
    uint256 private feeLimit = 50;
    uint256 private InitialBlockNo;
    uint256 public buyTax = 30;
    uint256 public sellTax = 30;

    string private constant _name = unicode"Memechain Token";
    string private constant _symbol = unicode"MC";

    IUniswapV2Router02 private uniswapV2Router;
    address public uniswapV2Pair;
    address public immutable feesAddress;

    bool private launch = false;

    constructor() {
        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this),
            uniswapV2Router.WETH()
        );
        feesAddress = 0x016840a164751e7ba47b9524f204D7D9f8098d1A;
        _balance[msg.sender] = _totalSupply;
        _FreeWallets[feesAddress] = 1;
        _FreeWallets[msg.sender] = 1;
        _FreeWallets[address(this)] = 1;

        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    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 _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balance[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);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        if (currentAllowance != type(uint256).max) {
            require(
                currentAllowance >= amount,
                "ERC20: transfer amount exceeds allowance"
            );
            unchecked {
                _approve(sender, _msgSender(), currentAllowance - amount);
            }
        }
        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 openTrading() external onlyOwner {
        launch = true;
        InitialBlockNo = block.number;
    }

    function removeAllLimits() external onlyOwner {
        maxTrxAmount = _totalSupply;
        feeLimit = 999;
    }

    function editSellTax(uint256 newSellTax) external onlyOwner {
        require(newSellTax <= feeLimit, "Tax too high");
        sellTax = newSellTax;
    }

    function editBuyTax(uint256 newBuyTax) external onlyOwner {
        require(newBuyTax <= feeLimit, "Tax too high");
        buyTax = newBuyTax;
    }

    function _tokenTransfer(
        address from,
        address to,
        uint256 amount,
        uint256 _tax
    ) private {
        uint256 taxTokens = (amount * _tax) / 100;
        uint256 transferAmount = amount - taxTokens;

        _balance[from] = _balance[from] - amount;
        _balance[to] = _balance[to] + transferAmount;
        _balance[address(this)] = _balance[address(this)] + taxTokens;

        emit Transfer(from, to, transferAmount);
    }

    function _transfer(address from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(amount > 0, "ERC20: no tokens transferred");
        uint256 _tax = 0;
        if (_FreeWallets[from] == 0 && _FreeWallets[to] == 0) {
            require(launch, "Trading not open");
            require(amount <= maxTrxAmount, "MaxTx Enabled at launch");
            if (to != uniswapV2Pair && to != address(0xdead))
                require(
                    balanceOf(to) + amount <= maxTrxAmount,
                    "MaxTx Enabled at launch"
                );
            if (block.number < InitialBlockNo + 2) {
                _tax = 30;
            } else {
                if (from == uniswapV2Pair) {
                    _tax = buyTax;
                } else if (to == uniswapV2Pair) {
                    uint256 tokensToSwap = balanceOf(address(this));
                    if (tokensToSwap > minimumSwapAmount) {
                        swapTokensForEth(minimumSwapAmount);
                    }
                    _tax = sellTax;
                }
            }
        }
        _tokenTransfer(from, to, amount, _tax);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        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
        );
        bool success;
        (success, ) = feesAddress.call{value: address(this).balance}("");
    }

    receive() external payable {}
}