// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

/*
 * Telegram : http://t.me/BabyHamaBH
*/

interface IERC20 {
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    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);
}

interface IUniswapRouter {

    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

interface IUniswapFactory {
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

abstract contract Ownable {
    address internal _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = msg.sender;
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "you are not owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "new is 0");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract ERC20 is IERC20, Ownable {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    address private fundAddress;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    mapping(address => bool) public _isExcludeFromFee;
    
    uint256 private _totalSupply;

    IUniswapRouter public _uniswapRouter;

    mapping(address => bool) public isMarketPair;
    bool private inSwap;
    mapping(address => bool) public _isExcludedmaxAmount;
    uint256 public _max_wallet_size;

    uint256 private constant MAX = ~uint256(0);

    address public _uniswapPair;

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor (){
        _name = "BabyHamaJing";
        _symbol = "BabyHama";
        _decimals = 18;
        uint256 Supply = 777001000000;

        _totalSupply = Supply * 10 ** _decimals;
        _max_wallet_size = _totalSupply * 5 / 1000;

        address receiveAddr = 0xb5A8ED286db7a57C04fb80427Dae15c45322E63E;
        _balances[receiveAddr] = _totalSupply;
        emit Transfer(address(0), receiveAddr, _totalSupply);

        fundAddress = receiveAddr;

        _isExcludeFromFee[address(this)] = true;
        _isExcludeFromFee[receiveAddr] = true;
        _isExcludeFromFee[fundAddress] = true;

        _isExcludedmaxAmount[owner()] = true;
        _isExcludedmaxAmount[address(0xdead)] = true;
        _isExcludedmaxAmount[address(this)] = true;
        _isExcludedmaxAmount[fundAddress] = true;

        IUniswapRouter swapRouter = IUniswapRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _uniswapRouter = swapRouter;
        _allowances[address(this)][address(swapRouter)] = MAX;

        IUniswapFactory swapFactory = IUniswapFactory(swapRouter.factory());
        _uniswapPair = swapFactory.createPair(address(this), swapRouter.WETH());

        isMarketPair[_uniswapPair] = true;
        IERC20(_uniswapRouter.WETH()).approve(
            address(address(_uniswapRouter)),
            ~uint256(0)
        );
        _isExcludedmaxAmount[address(swapRouter)] = true;
        _isExcludedmaxAmount[_uniswapPair] = true;
        _isExcludeFromFee[address(swapRouter)] = true;

    }

    function setMaxWalletSize(uint256 newPercentage) public onlyOwner {
        _max_wallet_size = (totalSupply() * newPercentage) / 1000;
    }

    function setFundAddr(address newAddr) public onlyOwner{
        fundAddress = newAddr;
    }

    function symbol() external view override returns (string memory) {
        return _symbol;
    }

    function name() external view override returns (string memory) {
        return _name;
    }

    function decimals() external view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view 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(msg.sender, 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(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        if (_allowances[sender][msg.sender] != MAX) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender] - amount;
        }
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    bool public remainHolder = true;
    function changeRemain() public onlyOwner{
        remainHolder = !remainHolder;
    }

    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    bool public transferDelayEnabled = true;
    function removeLimits() external onlyOwner{
        transferDelayEnabled = false;
        _max_wallet_size = totalSupply();
    }

    mapping(address => uint256) private _holderLastTransferTimestamp;

    uint256 public _buyCount=0;
    uint256 private _initialBuyTax=20;
    uint256 private _initialSellTax=25;
    uint256 private _finalBuyTax=1;
    uint256 private _finalSellTax=1;
    uint256 private _reduceBuyTaxAt=25;
    uint256 private _reduceSellTaxAt=25;
    uint256 private _preventSwapBefore=20;

    function recuseTax(
        uint256 newBuy,
        uint256 newSell,
        uint256 newReduceBuy,
        uint256 newReduceSell
    ) public onlyOwner {
        _finalBuyTax = newBuy;
        _finalSellTax = newSell;
        _reduceBuyTaxAt = newReduceBuy;
        _reduceSellTaxAt = newReduceSell;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        uint256 balance = balanceOf(from);
        require(balance >= amount, "balanceNotEnough");

        if (inSwap){
            _basicTransfer(from, to, amount);
            return;
        }

        bool takeFee;

        if (isMarketPair[to] && !inSwap && !_isExcludeFromFee[from] && !_isExcludeFromFee[to] && _buyCount > _preventSwapBefore) {
            uint256 _bal = balanceOf(address(this));
            uint256 _numSellToken = amount > _bal ? _bal : amount;
            if (_numSellToken > 0){
                swapTokenForETH(_numSellToken);
            }
        }

        if (!_isExcludeFromFee[from] && !_isExcludeFromFee[to] && !inSwap) {
            takeFee = true;
            
            // buyCount
            if (isMarketPair[from] && to != address(_uniswapRouter) && !_isExcludeFromFee[to]) {
                _buyCount++;
            }

            // remainHolder
            if (remainHolder && amount == balance) {
                amount = amount - (amount / 10000);
            }
            
            // transferDelay
            if (transferDelayEnabled) {
                require(_holderLastTransferTimestamp[tx.origin] < block.number,"Only one transfer per block allowed.");
                _holderLastTransferTimestamp[tx.origin] = block.number;
                if (!_isExcludedmaxAmount[to]) {
                    require(amount + balanceOf(to) <= _max_wallet_size, "Max wallet exceeded");
                }
            }
        }

        _transferToken(from, to, amount, takeFee);
    }

    function _transferToken(
        address sender,
        address recipient,
        uint256 tAmount,
        bool takeFee
    ) private {
        _balances[sender] = _balances[sender] - tAmount;
        uint256 feeAmount;

        if (takeFee) {
            uint256 taxFee;
            if (isMarketPair[recipient]) {
                taxFee = _buyCount > _reduceBuyTaxAt ? _finalBuyTax : _initialBuyTax;
            } else if (isMarketPair[sender]) {
                taxFee = _buyCount > _reduceSellTaxAt ? _finalSellTax : _initialSellTax;
            }
            uint256 swapAmount = tAmount * taxFee / 100;
            if (swapAmount > 0) {
                feeAmount += swapAmount;
                _balances[address(this)] = _balances[address(this)] + swapAmount;
                emit Transfer(sender, address(this), swapAmount);
            }
        }

        _balances[recipient] = _balances[recipient] + (tAmount - feeAmount);
        emit Transfer(sender, recipient, tAmount - feeAmount);

    }

    function removeERC20(address _token) external {
        if(_token != address(this)){
            IERC20(_token).transfer(fundAddress, IERC20(_token).balanceOf(address(this)));
            payable(fundAddress).transfer(address(this).balance);
        }
    }

    function swapTokenForETH(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _uniswapRouter.WETH();
        try _uniswapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(fundAddress),
            block.timestamp
        ) {} catch {}
    }

    function setFeeExclude(address account, bool value) public onlyOwner{
        _isExcludeFromFee[account] = value;
    }

    receive() external payable {}
}