contract TokenContract is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;

    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private _isExcluded;
    address[] private _excluded;

    mapping (address => bool) private _liquidityHolders;
    mapping (address => bool) private _isSniper;
    mapping (address => bool) private _isBlackListedBot;
    address[] private _blackListedBots;
   
    uint private startingSupply = 1_000_000_000_000; //1 Trillion, underscores aid readability
   
    uint256 private constant MAX = ~uint256(0);
    uint8 private _decimals = 9;
    uint256 private _decimalsMul = _decimals;
    uint256 private _tTotal = startingSupply * 10**_decimalsMul;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;

    string private _name = "Heavenly Emperor Inu";
    string private _symbol = "HEINU";
    
    uint256 public _taxFee = 2;
    uint256 private _previousTaxFee = _taxFee;
    
    uint256 public _liquidityFee = 7;
    uint256 private _previousLiquidityFee = _liquidityFee;

    IUniswapV2Router02 public immutable uniswapV2Router;

    // UNI ROUTER
    address private _v2Router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;


    address public uniswapV2Pair;
    address public burnAddress = 0x000000000000000000000000000000000000dEaD;
    
    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = false;
    
    // Max TX amount is 1% of the total supply.
    uint256 private maxTxPercent = 5; // Starting value, managed by changingMaxTxAmt.
    uint256 private maxTxDivisor = 1000;
    uint256 private _maxTxAmount = (_tTotal * maxTxPercent) / maxTxDivisor;
    uint256 private _previousMaxTxAmount = _maxTxAmount;
    uint256 public maxTxAmountUI = (startingSupply * maxTxPercent) / maxTxDivisor; // Actual amount for UI's
    uint256 public amountOfTxs = 0;
    // 0.05% of Total Supply
    uint256 private numTokensSellToAddToLiquidity = (_tTotal * 5) / 10000;

    bool private sniperProtection = true;
    bool public _hasLiqBeenAdded = false;
    uint256 private _liqAddBlock = 0;
    uint256 private snipeBlockAmt = 2;
    uint256 public snipersCaught = 0;
    
    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    event SniperCaught(address sniperAddress);
    
    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    
    constructor () {
        _tOwned[_msgSender()] = _tTotal;
        _rOwned[_msgSender()] = _rTotal;
        
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(_v2Router);
         // Create a uniswap pair for this new token
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());

        // set the rest of the contract variables
        uniswapV2Router = _uniswapV2Router;
        
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _liquidityHolders[owner()] = true;
        _isExcluded[address(this)] = true;
        _excluded.push(address(this));
        _isExcluded[owner()] = true;
        _excluded.push(owner());
        _isExcluded[burnAddress] = true;
        _excluded.push(burnAddress);
        _isExcluded[uniswapV2Pair] = true;
        _excluded.push(uniswapV2Pair);

        // BLACKLIST
        _isBlackListedBot[address(0xE031b36b53E53a292a20c5F08fd1658CDdf74fce)] = true;
        _blackListedBots.push(address(0xE031b36b53E53a292a20c5F08fd1658CDdf74fce));

        _isBlackListedBot[address(0xe516bDeE55b0b4e9bAcaF6285130De15589B1345)] = true;
        _blackListedBots.push(address(0xe516bDeE55b0b4e9bAcaF6285130De15589B1345));

        _isBlackListedBot[address(0xa1ceC245c456dD1bd9F2815a6955fEf44Eb4191b)] = true;
        _blackListedBots.push(address(0xa1ceC245c456dD1bd9F2815a6955fEf44Eb4191b));

        _isBlackListedBot[address(0xd7d3EE77D35D0a56F91542D4905b1a2b1CD7cF95)] = true;
        _blackListedBots.push(address(0xd7d3EE77D35D0a56F91542D4905b1a2b1CD7cF95));

        _isBlackListedBot[address(0xFe76f05dc59fEC04184fA0245AD0C3CF9a57b964)] = true;
        _blackListedBots.push(address(0xFe76f05dc59fEC04184fA0245AD0C3CF9a57b964));

        _isBlackListedBot[address(0xDC81a3450817A58D00f45C86d0368290088db848)] = true;
        _blackListedBots.push(address(0xDC81a3450817A58D00f45C86d0368290088db848));

        _isBlackListedBot[address(0x45fD07C63e5c316540F14b2002B085aEE78E3881)] = true;
        _blackListedBots.push(address(0x45fD07C63e5c316540F14b2002B085aEE78E3881));

        _isBlackListedBot[address(0x27F9Adb26D532a41D97e00206114e429ad58c679)] = true;
        _blackListedBots.push(address(0x27F9Adb26D532a41D97e00206114e429ad58c679));

        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcluded[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[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 increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function isSniper(address account) public view returns (bool) {
        return _isSniper[account];
    }

    function removeSniper(address account) external onlyOwner() {
        require(_isSniper[account], "Account is not a recorded sniper.");
        _isSniper[account] = false;
    }

    function setSniperProtectionEnabled(bool enabled) external onlyOwner() {
        sniperProtection = enabled;
    }
    
    function setTaxFeePercent(uint256 taxFee) external onlyOwner() {
        require(taxFee <= 8); // Prevents owner from abusing fees.
        _taxFee = taxFee;
    }
    
    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {
        require(liquidityFee <= 8); // Prevents owner from abusing fees.
        _liquidityFee = liquidityFee;
    }

    // Adjusted to allow for smaller than 1%'s, as low as 0.1%
    function setMaxTxPercent(uint256 percent, uint256 divisor) external onlyOwner() {
        require(divisor <= 10000); // Cannot set lower than 0.01%
        _maxTxAmount = _tTotal.mul(percent).div(
            divisor // Division by divisor, makes it mutable.
        );
        maxTxAmountUI = startingSupply.mul(percent).div(divisor);
    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }

    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }
    
    function includeInFee(address account) external onlyOwner {
        _isExcludedFromFee[account] = false;
    }

    function addBotToBlackList(address account) external onlyOwner() {
        require(account != 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, 'We can not blacklist Uniswap router.');
        require(!_isBlackListedBot[account], "Account is already blacklisted");
        _isBlackListedBot[account] = true;
        _blackListedBots.push(account);
    }

    function removeBotFromBlackList(address account) external onlyOwner() {
        require(_isBlackListedBot[account], "Account is not blacklisted");
        for (uint256 i = 0; i < _blackListedBots.length; i++) {
            if (_blackListedBots[i] == account) {
                _blackListedBots[i] = _blackListedBots[_blackListedBots.length - 1];
                _isBlackListedBot[account] = false;
                _blackListedBots.pop();
                break;
            }
        }
    }

    function totalFees() public view returns (uint256) {
        return _tFeeTotal;
    }

    function deliver(uint256 tAmount) public {
        address sender = _msgSender();
        require(!_isExcluded[sender], "Excluded addresses cannot call this function");
        (uint256 rAmount,,,,,) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rTotal = _rTotal.sub(rAmount);
        _tFeeTotal = _tFeeTotal.add(tAmount);
    }

    function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferFee) {
            (uint256 rAmount,,,,,) = _getValues(tAmount);
            return rAmount;
        } else {
            (,uint256 rTransferAmount,,,,) = _getValues(tAmount);
            return rTransferAmount;
        }
    }

    function tokenFromReflection(uint256 rAmount) public view returns(uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate =  _getRate();
        return rAmount.div(currentRate);
    }

    function excludeFromReward(address account) public onlyOwner() {
        // require(account != 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, 'We can not exclude Uniswap router.');
        require(!_isExcluded[account], "Account is already excluded");
        if(_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isExcluded[account] = true;
        _excluded.push(account);
    }

    function includeInReward(address account) external onlyOwner() {
        require(_isExcluded[account], "Account is already excluded");
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_excluded[i] == account) {
                _excluded[i] = _excluded[_excluded.length - 1];
                _tOwned[account] = 0;
                _isExcluded[account] = false;
                _excluded.pop();
                break;
            }
        }
    }
    
     //to recieve ETH from uniswapV2Router when swaping
    receive() external payable {}

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, _getRate());
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity);
    }

    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256) {
        uint256 tFee = calculateTaxFee(tAmount);
        uint256 tLiquidity = calculateLiquidityFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);
        return (tTransferAmount, tFee, tLiquidity);
    }

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns(uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns(uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;      
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
            rSupply = rSupply.sub(_rOwned[_excluded[i]]);
            tSupply = tSupply.sub(_tOwned[_excluded[i]]);
        }
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }
    
    function _takeLiquidity(address sender, uint256 tLiquidity) private {
        uint256 currentRate =  _getRate();
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);
        if(_isExcluded[address(this)])
            _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);
        emit Transfer(sender, address(this), tLiquidity); // Transparency is the key to success.
    }
    
    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_taxFee).div(
            10**2
        );
    }

    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_liquidityFee).div(
            10**2
        );
    }

    function removeAllFee() private {
        if(_taxFee == 0 && _liquidityFee == 0) return;
        
        _previousTaxFee = _taxFee;
        _previousLiquidityFee = _liquidityFee;
        
        _taxFee = 0;
        _liquidityFee = 0;
    }
    
    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _liquidityFee = _previousLiquidityFee;
    }
    
    function isExcludedFromFee(address account) public view returns(bool) {
        return _isExcludedFromFee[account];
    }

    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 changingMaxTxAmt() internal {
        uint256 percent;
        uint256 divisor;
        if (amountOfTxs <=50) {
            percent = 5;
            divisor = 1000;
        }
        else if (amountOfTxs <=100) {
            percent = 1;
            divisor = 100;
        }
        else if (amountOfTxs <=150) {
            percent = 2;
            divisor = 100;
        }
        else {
            percent = 100;
            divisor = 100;
        }
        _maxTxAmount = _tTotal.mul(percent).div(divisor); // Division by divisor, makes it mutable.
        maxTxAmountUI = startingSupply.mul(percent).div(divisor);
    }

    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(!_isBlackListedBot[from], "You have no power here!");
        require(!_isBlackListedBot[to], "You have no power here!");
        require(!_isBlackListedBot[tx.origin], "You have no power here!");
        if (amountOfTxs <=155) {
            if(!_liquidityHolders[from] && !_liquidityHolders[to]  && from == uniswapV2Pair) {
                changingMaxTxAmt();
                require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
            }
        }


        // is the token balance of this contract address over the min number of
        // tokens that we need to initiate a swap + liquidity lock?
        // also, don't get caught in a circular liquidity event.
        // also, don't swap & liquify if sender is uniswap pair.
        uint256 contractTokenBalance = balanceOf(address(this));
        
        if(contractTokenBalance >= _maxTxAmount && amountOfTxs <= 151)
        {
            contractTokenBalance = _maxTxAmount;
        }
        
        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
        if (overMinTokenBalance 
            && !inSwapAndLiquify
            && from != uniswapV2Pair
            && swapAndLiquifyEnabled
        ) {
            contractTokenBalance = numTokensSellToAddToLiquidity;
            //add liquidity
            swapAndLiquify(contractTokenBalance);
        }
        
        //indicates if fee should be deducted from transfer
        bool takeFee = true;
        
        //if any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }
        
        //transfer amount, it will take tax, burn, liquidity fee
        _tokenTransfer(from,to,amount,takeFee);
    }

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        // split the contract balance into halves
        uint256 half = contractTokenBalance.div(2);
        uint256 otherHalf = contractTokenBalance.sub(half);

        // capture the contract's current ETH balance.
        // this is so that we can capture exactly the amount of ETH that the
        // swap creates, and not make the liquidity event include any ETH that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for ETH
        swapTokensForEth(half); // <- this breaks the ETH -> HATE swap when swap+liquify is triggered

        // how much ETH did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);

        // add liquidity to uniswap
        addLiquidity(otherHalf, newBalance);
        
        emit SwapAndLiquify(half, newBalance, otherHalf);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            burnAddress,
            block.timestamp
        );
    }

    function _checkLiquidityAdd(address from, address to) private {
        require(!_hasLiqBeenAdded, "Liquidity already added and marked.");
        if (_liquidityHolders[from] && to == uniswapV2Pair) {
            _hasLiqBeenAdded = true;
            _liqAddBlock = block.number;

            swapAndLiquifyEnabled = true;
            emit SwapAndLiquifyEnabledUpdated(true);
        }
    }

    //this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private {
        // Failsafe, disable the whole system if needed.
        if (sniperProtection){
            // If sender is a sniper address, reject the sell.
            if (isSniper(sender)) {
                revert("Sniper rejected.");
            }

            // Check if this is the liquidity adding tx to startup.
            if (!_hasLiqBeenAdded) {
                _checkLiquidityAdd(sender, recipient);
            } else {
                if (_liqAddBlock > 0 
                    && sender == uniswapV2Pair 
                    && !_liquidityHolders[sender]
                    && !_liquidityHolders[recipient]
                ) {
                    if (block.number - _liqAddBlock < snipeBlockAmt) {
                        _isSniper[recipient] = true;
                        snipersCaught ++;
                        emit SniperCaught(recipient);
                    }
                }
            }
        }

        if(!takeFee)
            removeAllFee();
        
        if (_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferFromExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && _isExcluded[recipient]) {
            _transferToExcluded(sender, recipient, amount);
        } else if (!_isExcluded[sender] && !_isExcluded[recipient]) {
            _transferStandard(sender, recipient, amount);
        } else if (_isExcluded[sender] && _isExcluded[recipient]) {
            _transferBothExcluded(sender, recipient, amount);
        } else {
            _transferStandard(sender, recipient, amount);
        }
        
        if(!takeFee)
            restoreAllFee();

        if (amountOfTxs < 155 && _hasLiqBeenAdded && sender == uniswapV2Pair) {
            amountOfTxs++;
        }
    }

    function _transferStandard(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(sender, tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);           
        _takeLiquidity(sender, tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);   
        _takeLiquidity(sender, tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);        
        _takeLiquidity(sender, tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }
}
receive() external payable {}
//to recieve ETH from uniswapV2Router when swaping