Noosphere (NOS)

// SPDX-License-Identifier: MIT
/*
https://t.me/Noosphere_AI
https://x.com/noosphere_ai
https://Noosphere-ai.com
https://noosphere.gitbook.io

*/

pragma solidity ^0.8.20;

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;
    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 Noosphere is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private isExcluded;
    mapping (address => bool) public tradingPair;
    address payable private _uniqueTreasury;
    uint256 launchBlock;

    uint256 private _initialBuyFee=20;
    uint256 private _initialSellFee=25;
    uint256 private _finalBuyFee=4;
    uint256 private _finalSellFee=4;
    uint256 private _reduceBuyFeeAt=25;
    uint256 private _reduceSellFeeAt=25;
    uint256 private _preventSwapBefore=3;
    uint256 private _buyCounter= 0;
    uint256 private sellCounter = 0;
    uint256 private lastSellBlock = 0;

    uint8 private constant _decimals = 9;
    uint256 private constant _totalSupply = 10000000 * 10**_decimals;
    string private constant _name = "Noosphere";
    string private constant _symbol = "NOS";
    uint256 public _maxTransactionAmount = 150000 * 10**_decimals;
    uint256 public _maxWalletAmount = 250000 * 10**_decimals;
    uint256 public _swapThreshold = 75000 * 10**_decimals;
    uint256 public _maxSwapAmount = 75000 * 10**_decimals;

    IUniswapV2Router02 private uniswapV2Router;
    address public uniswapV2Pair;
    bool private tradingEnabled;
    uint256 public maxSellsPerBlock = 3;
    bool private inSwap = false;
    bool private swapEnabled = false;
    bool public sellLimitActive = true;

    event MaxTransactionUpdated(uint _maxTransactionAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _uniqueTreasury = payable(0x11a29832c70f629f55C4A04b3e19B446E38EFFcC);
        _balances[_msgSender()] = _totalSupply;
        isExcluded[owner()] = true;
        isExcluded[address(this)] = true;
        isExcluded[address(uniswapV2Pair)] = true;
        
        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 _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 _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");
        uint256 feeAmount=0;

        if (from != owner() && to != owner()) {
            feeAmount = amount.mul((_buyCounter > _reduceBuyFeeAt) ? _finalBuyFee : _initialBuyFee).div(100);

            if (tradingPair[from] && to != address(uniswapV2Router) && !isExcluded[to]) {
                require(amount <= _maxTransactionAmount, "Exceeds the max transaction amount.");
                require(balanceOf(to) + amount <= _maxWalletAmount, "Exceeds the max wallet amount.");

                if (launchBlock + 1 > block.number) {
                    require(!isContract(to));
                }
                _buyCounter++;
            }

            if (!tradingPair[to] && !isExcluded[to]) {
                require(balanceOf(to) + amount <= _maxWalletAmount, "Exceeds the max wallet amount.");
            }

            if(tradingPair[to] && from != address(this)) {
                feeAmount = amount.mul((_buyCounter > _reduceSellFeeAt) ? _finalSellFee : _initialSellFee).div(100);
            }

	        if (!tradingPair[from] && !tradingPair[to] && from != address(this)) {
                feeAmount = 0;
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (sellLimitActive && !inSwap && tradingPair[to] && swapEnabled && contractTokenBalance > _swapThreshold && _buyCounter > _preventSwapBefore) {
                if (block.number > lastSellBlock) {
                    sellCounter = 0;
                }
                require(sellCounter < maxSellsPerBlock, "Max sells per block reached");
                swapTokensForEth(min(amount, min(contractTokenBalance, _maxSwapAmount)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToTreasury(address(this).balance);
                }
                sellCounter++;
                lastSellBlock = block.number;
            }

            else if(!inSwap && tradingPair[to] && swapEnabled && contractTokenBalance > _swapThreshold && _buyCounter > _preventSwapBefore) {
                swapTokensForEth(min(amount, min(contractTokenBalance, _maxSwapAmount)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToTreasury(address(this).balance);
                }
            }
        }

        if(feeAmount > 0){
          _balances[address(this)] = _balances[address(this)].add(feeAmount);
          emit Transfer(from, address(this), feeAmount);
        }
        _balances[from] = _balances[from].sub(amount);
        _balances[to] = _balances[to].add(amount.sub(feeAmount));
        emit Transfer(from, to, amount.sub(feeAmount));
    }

    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a > b) ? b : a;
    }

    function isContract(address account) private view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    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 rescueETH() external onlyOwner {
        payable(_uniqueTreasury).transfer(address(this).balance);
    }

    function updateFeeSettings(uint256 newInitialBuyFee, uint256 newInitialSellFee, uint256 newReduceBuyAt, uint256 newReduceSellAt, uint256 newPreventSwapBefore) external onlyOwner {
        _initialBuyFee = newInitialBuyFee;
        _initialSellFee = newInitialSellFee;
        _reduceBuyFeeAt = newReduceBuyAt;
        _reduceSellFeeAt = newReduceSellAt;
        _preventSwapBefore = newPreventSwapBefore;
    }

    function rescueTokens(address tokenAddr, uint amount) external onlyOwner {
        IERC20(tokenAddr).transfer(_uniqueTreasury, amount);
    }

    function removeLimits() external onlyOwner {
        _maxTransactionAmount = _totalSupply;
        _maxWalletAmount = _totalSupply;
        emit MaxTransactionUpdated(_totalSupply);
    }

    function sendETHToTreasury(uint256 amount) private {
        _uniqueTreasury.transfer(amount);
    }

    function enableTrading() external onlyOwner() {
        require(!tradingEnabled, "Trading is already enabled");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _totalSupply);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        tradingPair[address(uniswapV2Pair)] = true;
        isExcluded[address(uniswapV2Pair)] = true;
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this), balanceOf(address(this)), 0, 0, owner(), block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled = true;
        tradingEnabled = true;
        launchBlock = block.number;
    }

    receive() external payable {}

    function manualSwap() external {
        require(_msgSender() == _uniqueTreasury);
        uint256 tokenBalance = balanceOf(address(this));
        if(tokenBalance > 0 && swapEnabled){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if(ethBalance > 0){
          sendETHToTreasury(ethBalance);
        }
    }
}