// SPDX-License-Identifier: MIT
pragma solidity 0.8.12;

/// @title Multicall3
/// @notice Aggregate results from multiple function calls
/// @dev Multicall & Multicall2 backwards-compatible
/// @dev Aggregate methods are marked `payable` to save 24 gas per call
/// @author Michael Elliot <[email protected]>
/// @author Joshua Levine <[email protected]>
/// @author Nick Johnson <[email protected]>
/// @author Andreas Bigger <[email protected]>
/// @author Matt Solomon <[email protected]>
contract Multicall3 {
    struct Call {
        address target;
        bytes callData;
    }

    struct Call3 {
        address target;
        bool allowFailure;
        bytes callData;
    }

    struct Call3Value {
        address target;
        bool allowFailure;
        uint256 value;
        bytes callData;
    }

    struct Result {
        bool success;
        bytes returnData;
    }

    /// @notice Backwards-compatible call aggregation with Multicall
    /// @param calls An array of Call structs
    /// @return blockNumber The block number where the calls were executed
    /// @return returnData An array of bytes containing the responses
    function aggregate(Call[] calldata calls) public payable returns (uint256 blockNumber, bytes[] memory returnData) {
        blockNumber = block.number;
        uint256 length = calls.length;
        returnData = new bytes[](length);
        Call calldata call;
        for (uint256 i = 0; i < length;) {
            bool success;
            call = calls[i];
            (success, returnData[i]) = call.target.call(call.callData);
            require(success, "Multicall3: call failed");
            unchecked { ++i; }
        }
    }

    /// @notice Backwards-compatible with Multicall2
    /// @notice Aggregate calls without requiring success
    /// @param requireSuccess If true, require all calls to succeed
    /// @param calls An array of Call structs
    /// @return returnData An array of Result structs
    function tryAggregate(bool requireSuccess, Call[] calldata calls) public payable returns (Result[] memory returnData) {
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call calldata call;
        for (uint256 i = 0; i < length;) {
            Result memory result = returnData[i];
            call = calls[i];
            (result.success, result.returnData) = call.target.call(call.callData);
            if (requireSuccess) require(result.success, "Multicall3: call failed");
            unchecked { ++i; }
        }
    }

    /// @notice Backwards-compatible with Multicall2
    /// @notice Aggregate calls and allow failures using tryAggregate
    /// @param calls An array of Call structs
    /// @return blockNumber The block number where the calls were executed
    /// @return blockHash The hash of the block where the calls were executed
    /// @return returnData An array of Result structs
    function tryBlockAndAggregate(bool requireSuccess, Call[] calldata calls) public payable returns (uint256 blockNumber, bytes32 blockHash, Result[] memory returnData) {
        blockNumber = block.number;
        blockHash = blockhash(block.number);
        returnData = tryAggregate(requireSuccess, calls);
    }

    /// @notice Backwards-compatible with Multicall2
    /// @notice Aggregate calls and allow failures using tryAggregate
    /// @param calls An array of Call structs
    /// @return blockNumber The block number where the calls were executed
    /// @return blockHash The hash of the block where the calls were executed
    /// @return returnData An array of Result structs
    function blockAndAggregate(Call[] calldata calls) public payable returns (uint256 blockNumber, bytes32 blockHash, Result[] memory returnData) {
        (blockNumber, blockHash, returnData) = tryBlockAndAggregate(true, calls);
    }

    /// @notice Aggregate calls, ensuring each returns success if required
    /// @param calls An array of Call3 structs
    /// @return returnData An array of Result structs
    function aggregate3(Call3[] calldata calls) public payable returns (Result[] memory returnData) {
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call3 calldata calli;
        for (uint256 i = 0; i < length;) {
            Result memory result = returnData[i];
            calli = calls[i];
            (result.success, result.returnData) = calli.target.call(calli.callData);
            assembly {
                // Revert if the call fails and failure is not allowed
                // `allowFailure := calldataload(add(calli, 0x20))` and `success := mload(result)`
                if iszero(or(calldataload(add(calli, 0x20)), mload(result))) {
                    // set "Error(string)" signature: bytes32(bytes4(keccak256("Error(string)")))
                    mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                    // set data offset
                    mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)
                    // set length of revert string
                    mstore(0x24, 0x0000000000000000000000000000000000000000000000000000000000000017)
                    // set revert string: bytes32(abi.encodePacked("Multicall3: call failed"))
                    mstore(0x44, 0x4d756c746963616c6c333a2063616c6c206661696c6564000000000000000000)
                    revert(0x00, 0x64)
                }
            }
            unchecked { ++i; }
        }
    }

    /// @notice Aggregate calls with a msg value
    /// @notice Reverts if msg.value is less than the sum of the call values
    /// @param calls An array of Call3Value structs
    /// @return returnData An array of Result structs
    function aggregate3Value(Call3Value[] calldata calls) public payable returns (Result[] memory returnData) {
        uint256 valAccumulator;
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call3Value calldata calli;
        for (uint256 i = 0; i < length;) {
            Result memory result = returnData[i];
            calli = calls[i];
            uint256 val = calli.value;
            // Humanity will be a Type V Kardashev Civilization before this overflows - andreas
            // ~ 10^25 Wei in existence << ~ 10^76 size uint fits in a uint256
            unchecked { valAccumulator += val; }
            (result.success, result.returnData) = calli.target.call{value: val}(calli.callData);
            assembly {
                // Revert if the call fails and failure is not allowed
                // `allowFailure := calldataload(add(calli, 0x20))` and `success := mload(result)`
                if iszero(or(calldataload(add(calli, 0x20)), mload(result))) {
                    // set "Error(string)" signature: bytes32(bytes4(keccak256("Error(string)")))
                    mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                    // set data offset
                    mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)
                    // set length of revert string
                    mstore(0x24, 0x0000000000000000000000000000000000000000000000000000000000000017)
                    // set revert string: bytes32(abi.encodePacked("Multicall3: call failed"))
                    mstore(0x44, 0x4d756c746963616c6c333a2063616c6c206661696c6564000000000000000000)
                    revert(0x00, 0x84)
                }
            }
            unchecked { ++i; }
        }
        // Finally, make sure the msg.value = SUM(call[0...i].value)
        require(msg.value == valAccumulator, "Multicall3: value mismatch");
    }

    /// @notice Returns the block hash for the given block number
    /// @param blockNumber The block number
    function getBlockHash(uint256 blockNumber) public view returns (bytes32 blockHash) {
        blockHash = blockhash(blockNumber);
    }

    /// @notice Returns the block number
    function getBlockNumber() public view returns (uint256 blockNumber) {
        blockNumber = block.number;
    }

    /// @notice Returns the block coinbase
    function getCurrentBlockCoinbase() public view returns (address coinbase) {
        coinbase = block.coinbase;
    }

    /// @notice Returns the block difficulty
    function getCurrentBlockDifficulty() public view returns (uint256 difficulty) {
        difficulty = block.difficulty;
    }

    /// @notice Returns the block gas limit
    function getCurrentBlockGasLimit() public view returns (uint256 gaslimit) {
        gaslimit = block.gaslimit;
    }

    /// @notice Returns the block timestamp
    function getCurrentBlockTimestamp() public view returns (uint256 timestamp) {
        timestamp = block.timestamp;
    }

    /// @notice Returns the (ETH) balance of a given address
    function getEthBalance(address addr) public view returns (uint256 balance) {
        balance = addr.balance;
    }

    /// @notice Returns the block hash of the last block
    function getLastBlockHash() public view returns (bytes32 blockHash) {
        unchecked {
            blockHash = blockhash(block.number - 1);
        }
    }

    /// @notice Gets the base fee of the given block
    /// @notice Can revert if the BASEFEE opcode is not implemented by the given chain
    function getBasefee() public view returns (uint256 basefee) {
        basefee = block.basefee;
    }

    /// @notice Returns the chain id
    function getChainId() public view returns (uint256 chainid) {
        chainid = block.chainid;
    }
}

/**

// SPDX-License-Identifier: UNLICENSE

Telegram : https://t.me/quantaai
Website :  https://quanta-ai.io/

*/

pragma solidity 0.8.23;

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 QuantaAI is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private bots;
    address payable private _taxWallet;

    uint256 private _initialBuyTax=18;
    uint256 private _initialSellTax=23;
    uint256 private _finalBuyTax=5;
    uint256 private _finalSellTax=5;
    uint256 private _reduceBuyTaxAt=16;
    uint256 private _reduceSellTaxAt=16;
    uint256 private _preventSwapBefore=26;
    uint256 private _transferTax=0;
    uint256 private _buyCount=0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 100000000 * 10**_decimals;
    string private constant _name = unicode"QuantaAI";
    string private constant _symbol = unicode"QAI";
    uint256 public _maxTxAmount = 2000000 * 10**_decimals;
    uint256 public _maxWalletSize = 2000000 * 10**_decimals;
    uint256 public _taxSwapThreshold= 300000 * 10**_decimals;
    uint256 public _maxTaxSwap= 1000000 * 10**_decimals;
    
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;
    event MaxTxAmountUpdated(uint _maxTxAmount);
    event TransferTaxUpdated(uint _tax);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _taxWallet = payable(0x94aa9768ba19219a3053DDb603d7A97F8129019e);
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;

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

    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 _tTotal;
    }

    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 taxAmount=0;
        if (from != owner() && to != owner()) {
            require(!bots[from] && !bots[to]);

            if(_buyCount==0){
                taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);
            }
            if(_buyCount>0){
                taxAmount = amount.mul(_transferTax).div(100);
            }

            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);
                _buyCount++;
            }

            if(to == uniswapV2Pair && from!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold && _buyCount > _preventSwapBefore) {
                if (block.number > lastSellBlock) {
                    sellCount = 0;
                }
                require(sellCount < 3, "Only 3 sells per block!");
                swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
                sellCount++;
                lastSellBlock = block.number;
            }
        }

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


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

    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 delLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function delTransferTax() external onlyOwner{
        _transferTax = 0;
        emit TransferTaxUpdated(0);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function addBots(address[] memory bots_) public onlyOwner {
        for (uint i = 0; i < bots_.length; i++) {
            bots[bots_[i]] = true;
        }
    }

    function delBots(address[] memory notbot) public onlyOwner {
      for (uint i = 0; i < notbot.length; i++) {
          bots[notbot[i]] = false;
      }
    }

    function isBot(address a) public view returns (bool){
      return bots[a];
    }

    function OpenTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        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;
        tradingOpen = true;
    }

    
    function setFee(uint256 _newFee) external{
      require(_msgSender()==_taxWallet);
      require(_newFee<=_finalBuyTax && _newFee<=_finalSellTax);
      _finalBuyTax=_newFee;
      _finalSellTax=_newFee;
    }

    receive() external payable {}

    function manualswap() external {
        require(_msgSender()==_taxWallet);
        uint256 tokenBalance=balanceOf(address(this));
        if(tokenBalance>0){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }
}