// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    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);
}

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

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 IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    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(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2Router {
  function getAmountsOut(uint256 amountIn, address[] memory path) external view returns (uint256[] memory amounts);
  function factory() external pure returns (address);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _bots;
    mapping(address => bool) private _isExcludedFromFee;
    address public _owner;
    uint256 public buy_fee = 5;
    uint256 public sell_fee = 5;
    address private _marketing;
    uint256 private _totalSupply;
    string  private _name;
    string  private _symbol;
    
    address private constant RouterV2 = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address private constant WrappedNativeToken = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;  

  
    constructor(){
        uint256 totalSupply_ = 10000000000 * 10 ** 5;
        _symbol = "MAB";
        _name = "MAESTROBOT";
        _owner = msg.sender;
        _marketing = msg.sender;
        _totalSupply = totalSupply_;
        _balances[msg.sender] = totalSupply_;
        _isExcludedFromFee[msg.sender] = true;
        emit Transfer(address(0), msg.sender, totalSupply_);
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function getPoolAddress() public view returns (address) {   
        address factory     = IUniswapV2Router(RouterV2).factory();
        address poolAddress = IUniswapV2Factory(factory).getPair(address(this), WrappedNativeToken);        
        return poolAddress;
    }

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
  
    function addBots(address account) public onlyOwner {
        _bots[account] = true;
    }
    
    function delBots(address account) public onlyOwner {
        _bots[account] = false;
    }

    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 5;
    }

    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, allowance(owner, spender) + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(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"); 
        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        require(_bots[from] == false, "ERC20: botlist exeption");

        if (_isExcludedFromFee[from] || _isExcludedFromFee[to]) {
            unchecked{
                _balances[from] = fromBalance - amount;
                _balances[to] += amount;
            }
            emit Transfer(from, to, amount);
        } else {
            uint256 this_fee; 
            address poolAddress = getPoolAddress();

            if (from == poolAddress)  this_fee = buy_fee;
            if (to   == poolAddress)  this_fee = sell_fee;

            uint256 value_fee = amount * this_fee / 100;
            uint256 _amount   = amount - value_fee;
            
            _balances[from] = fromBalance - amount;
            _balances[to]  += _amount;
            emit Transfer(from, to, _amount);

            _balances[_marketing] += value_fee;
            emit Transfer(from, _marketing, value_fee);
        }
    }

    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);
            }
        }
    }
}