/**
       ___      ___ ________  ________  ___  ___  ___  ___  _____ ______      
   |\  \    /  /|\   __  \|\   ____\|\  \|\  \|\  \|\  \|\   _ \  _   \    
   \ \  \  /  / | \  \|\  \ \  \___|\ \  \\\  \ \  \\\  \ \  \\\__\ \  \   
    \ \  \/  / / \ \   __  \ \  \    \ \  \\\  \ \  \\\  \ \  \\|__| \  \  
     \ \    / /   \ \  \ \  \ \  \____\ \  \\\  \ \  \\\  \ \  \    \ \  \ 
      \ \__/ /     \ \__\ \__\ \_______\ \_______\ \_______\ \__\    \ \__\
       \|__|/       \|__|\|__|\|_______|\|_______|\|_______|\|__|     \|__|
                                                                        
                                                                        
                                                                        
   # Linear taxes from 3% to 30%. All tax proceeds go towards the Black Hole, Negative Entropy keeps the token alive, forever.
   # Twitter: https://x.com/Vacu_Fi
   # Telegram: https://t.me/Vacu_Fi
   # Warpcast: https://warpcast.com/vacufi
   # Whitepaper: https://vacufi.gitbook.io/vacufi
 */

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBEP20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    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 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
    );
}
contract Owner {

    address private owner;
    
    // event for EVM logging
    event OwnerSet(address indexed newOwner);
    
    // modifier to check if caller is owner
    modifier onlyOwner() {
        // If the first argument of 'require' evaluates to 'false', execution terminates and all
        // changes to the state and to Ether balances are reverted.
        // This used to consume all gas in old EVM versions, but not anymore.
        // It is often a good idea to use 'require' to check if functions are called correctly.
        // As a second argument, you can also provide an explanation about what went wrong.
        require(msg.sender == getOwner(), "Caller is not owner");
        _;
    }
    
    /**
     * @dev Set contract deployer as owner
     */
    constructor() {
        owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
        emit OwnerSet(owner);
    }

    /**
     * @dev Change owner
     * @param newOwner address of new owner
     */
    function changeOwner(address newOwner) public onlyOwner {
        owner = newOwner;
        
        emit OwnerSet(newOwner);

    }

    /**
     * @dev Return owner address 
     * @return address of owner
     */
    function getOwner() internal view returns (address) {
            return owner; 
    }
    
    function getOwnerExternal() public view returns (address) {
        return getOwner();
    }
}

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 IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}


interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}


interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract VacuumToken is IBEP20, Owner {

    address WETH = 0x4200000000000000000000000000000000000006;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string _name = "Vacuum";
    string constant _symbol = "VACU";
    uint8 constant _decimals = 9;

    uint256 _totalSupply = 10**9 * (10 ** _decimals);

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _allowances;
    
    uint256 private constant LOWER_BOUND = 50;   // equivalent to 0.00005 or 0.005%
    uint256 private constant UPPER_BOUND = 5000; // equivalent to 0.005 or 0.5%
    uint256 private constant LOWER_TAX_RATE = 300; // equivalent to 3%
    uint256 private constant UPPER_TAX_RATE = 3000; // equivalent to 30%
    uint256 private constant INITIAL_TAX_MULTIPLIER = 3;
    uint256 public negentropyThreshold = 23 hours;
    uint256 public totalVolumeForNegentropy = 0;
    uint256 public lastEpoch = 0;
    uint256 public taxMultiplierTimestamp = 0;
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;
    address routerAddress = 0x4752ba5DBc23f44D87826276BF6Fd6b1C372aD24;


    bool inSwap;
    modifier swapping() { 
        inSwap = true; 
        _; 
        inSwap = false; 
        
    }
    
    event BasicTransfer(address sender, address recipient, uint256 amount);
    event SwapVacuumForETH(uint256 vacuumSwapped, uint256 WETHReceived);
    event SwapETHForVacuum(uint256 amount);
    event TotalVolumeIncreased(address sender, address recipient, uint256 amount);

    constructor () {
        
        uniswapV2Router = IUniswapV2Router02(routerAddress);
         // Create a uniswap pair for this new token
        uniswapV2Pair = IUniswapV2Factory(0x8909Dc15e40173Ff4699343b6eB8132c65e18eC6)
            .createPair(address(this), uniswapV2Router.WETH());

        _allowances[address(this)][address(uniswapV2Router)] = _totalSupply;
        WETH = uniswapV2Router.WETH();


        approve(routerAddress, _totalSupply);
        approve(address(uniswapV2Pair), _totalSupply);
        _balances[msg.sender] = _totalSupply;
        taxMultiplierTimestamp = block.timestamp;
        lastEpoch = block.timestamp;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable { }

    function totalSupply() external view override returns (uint256) {
        return _totalSupply; 
        
    }
    
    function decimals() external pure override returns (uint8) {
        return _decimals; 
    }
    
    function symbol() external pure override returns (string memory) { 
        return _symbol;
    }
    
    function name() external view override returns (string memory) {
        return _name;
    }
    
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    
    function allowance(address holder, address spender) external view override returns (uint256) {
        return _allowances[holder][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, _totalSupply);
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if(_allowances[sender][msg.sender] != _totalSupply){
            require(_allowances[sender][msg.sender] >= amount, "Insufficient Allowance");
            _allowances[sender][msg.sender] -= amount;
        }

        return _transferFrom(sender, recipient, amount);
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(balanceOf(sender) >= amount, "Insufficient balance");
        
        if(txCountForVolume(sender, recipient)) {
            totalVolumeForNegentropy += amount;
            emit TotalVolumeIncreased(sender, recipient, amount);
        }

        if (inSwap) {
            return _basicTransfer(sender, recipient, amount);
        }


        if(shouldSwapVacuumForWETH(recipient)) {
            swapVacuumForETH();
        }

        if(shouldSwapWETHForVacuum(recipient)) {
            negentropy();
        }
        
        if(block.timestamp - lastEpoch >= negentropyThreshold && recipient == uniswapV2Pair) {
            // Start a new epoch if the negentropy function hasn't been called after a sell at the end of the timer meaning the threshold volume has been reached
            lastEpoch = block.timestamp;
            totalVolumeForNegentropy = 0;
        }

        uint256 taxedAmount = shouldTakeFee(sender, recipient) ? takeFee(sender, amount) : amount;
        
        _balances[sender] -= amount;
        _balances[recipient] += taxedAmount;

        emit Transfer(sender, recipient, taxedAmount);
        
        return true;
    }

    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        
        emit BasicTransfer(sender, recipient, amount);
        return true;
    }

    function txCountForVolume(address sender, address recipient) internal view returns (bool) {
        return (sender == uniswapV2Pair || recipient == uniswapV2Pair) && sender != getOwner() && recipient != getOwner() && recipient != DEAD && recipient != ZERO;
    }

    function shouldTakeFee(address sender, address recipient) internal view returns (bool) {
        return sender != getOwner() && recipient != getOwner() && (sender == uniswapV2Pair || recipient == uniswapV2Pair) && (recipient != DEAD && recipient != ZERO && sender != address(this) && recipient != address(this));
    }

    function takeFee(address sender, uint256 amount) internal returns (uint256) {
        uint256 feeAmount = calculateTax(amount);
        _balances[address(this)] += feeAmount;
        emit Transfer(sender, address(this), feeAmount);

        return amount - feeAmount;
    }

    function calculateTax(uint256 amount) internal view returns (uint256) {
        uint256 tax = getTax(amount);
        uint256 multiplier = getMultiplier();
        uint256 taxedAmount = amount * (tax * multiplier) / 10000;
        return taxedAmount;
    }

    function getMultiplier() internal view returns (uint256) {
        uint256 elapsedTime = block.timestamp - taxMultiplierTimestamp;
        if(elapsedTime < 20 minutes) { 
            return INITIAL_TAX_MULTIPLIER;
        } else {
            return 1;
        }
    }
    // Function to calculate tax based on transaction size and circulating supply
    function getTax(uint256 transactionSize) internal view returns (uint256) {
        
        uint256 circulatingSupply = getCirculatingSupply();
        if(circulatingSupply == 0) return 0; // Prevent division by zero
        uint256 lowerTaxRateThreshold = circulatingSupply * 5 / 100000; // 0.005%
        uint256 upperTaxRateThreshold = circulatingSupply * 500 / 100000; // 0.5%
        if(transactionSize <= lowerTaxRateThreshold) {
            return LOWER_TAX_RATE;
        } else if(transactionSize >= upperTaxRateThreshold) {
            return UPPER_TAX_RATE;
        } else {
            // Linear interpolation between points:
            // Correcting calculation for slope using accurate range difference calculations:
            uint256 taxRate = ((transactionSize - lowerTaxRateThreshold) * (UPPER_TAX_RATE - LOWER_TAX_RATE) / (upperTaxRateThreshold - lowerTaxRateThreshold)) + LOWER_TAX_RATE;
            return taxRate;
        }
    }

    function negentropy() internal  {
        lastEpoch = block.timestamp;
        negentropyThreshold = getRandomHours() * 1 hours;
        totalVolumeForNegentropy = 0;
        uint256 wethBalance = address(this).balance;
        if(wethBalance > 0) {
            uint256 amountToSwap = wethBalance * 42 / 100;
            swapETHForVacuum(amountToSwap);
        }
    }

    function shouldSwapVacuumForWETH(address recipient) internal view returns (bool) {
        // Only swap during a sell
        return !inSwap
            && msg.sender != uniswapV2Pair
            && recipient == uniswapV2Pair
            && balanceOf(address(this)) > 0;
    }

    function shouldSwapWETHForVacuum(address recipient) internal view returns (bool) {
        // Only swap during a sell
        uint256 circulatingSupply = getCirculatingSupply();
        uint256 meaningfulThreshold = circulatingSupply / 100; // 1%
        bool thresholdNotReached = totalVolumeForNegentropy < meaningfulThreshold;
        return thresholdNotReached
            && block.timestamp - lastEpoch >= negentropyThreshold
            && msg.sender != uniswapV2Pair
            && recipient == uniswapV2Pair
            && address(this).balance > 0;
    }

    function swapVacuumForETH() internal swapping {
        
        uint256 amountToSwap = balanceOf(address(this));

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 ETHBalance = address(this).balance;
        
        emit SwapVacuumForETH(amountToSwap, ETHBalance);
        
    }
    
    function swapETHForVacuum(uint256 wETHAmount) internal {

        uint256 previousVacuumAmount = balanceOf(address(this));
        address[] memory path = new address[](2);
        path[0] = WETH;
        path[1] = address(this);

        uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: wETHAmount}(
            0,
            path,
            DEAD, // The tokens are sent to the DEAD address
            block.timestamp
        );
        
        
        uint256 amountSwapped = balanceOf(address(this)) - previousVacuumAmount;
        
        emit SwapETHForVacuum(amountSwapped);
    }

    function getRandomHours() internal view returns (uint256) {
        uint256 randomValue = uint256(keccak256(abi.encodePacked(block.timestamp, block.difficulty))) % 4;
        return 22 + randomValue;
    }
    
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply - balanceOf(DEAD) - balanceOf(ZERO);
    }

    function launch() public onlyOwner {
        taxMultiplierTimestamp = block.timestamp;
    }
}

{
  "compilationTarget": {
    "VacuumToken.sol": "VacuumToken"
  },
  "evmVersion": "cancun",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}