Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;
/*
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*/

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    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 18;
    }

    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 recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    function _createInitialSupply(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);
    }

    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);
    }
}

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() external virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

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

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
}

interface IDexFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

// interface IPAIToken is IERC20 {}

contract MayoBear is ERC20, Ownable {
    uint256 public maxBuyAmount;
    uint256 public maxSellAmount;
    uint256 public maxWalletAmount;

    IERC20 public paiToken;
    IDexRouter public dexRouter;
    address public lpPair;

    bool private swapping;
    uint256 public swapTokensAtAmount;

    address operationsAddress;
    address marketingAddress;
    address multisig;

    uint256 public tradingActiveBlock = 0; // 0 means trading is not active
    uint256 public blockForPenaltyEnd;
    mapping(address => bool) public boughtEarly;
    uint256 public botsCaught;

    bool public limitsInEffect = true;
    bool public tradingActive = false;
    bool public swapEnabled = false;

    // Anti-bot and anti-whale mappings and variables
    mapping(address => uint256) private _holderLastTransferTimestamp; // to hold last Transfers temporarily during launch
    bool public transferDelayEnabled = true;

    uint256 public buyTotalFees;
    uint256 public buyOperationsFee;
    uint256 public buyLiquidityFee;
    uint256 public buyMarketingFee;
    uint256 public buyBurnFee;
    uint256 public buyPAIBuybackFee;

    uint256 public sellTotalFees;
    uint256 public sellOperationsFee;
    uint256 public sellLiquidityFee;
    uint256 public sellMarketingFee;
    uint256 public sellBurnFee;
    uint256 public sellPAIBuybackFee;

    uint256 public tokensForOperations;
    uint256 public tokensForLiquidity;
    uint256 public tokensForMarketing;
    uint256 public tokensForBurn;
    uint256 public tokensForPAIBuyback;

    address public paiTokenAddress;
    uint256 public paiBuybackThreshold = 1000 * 1e18; // minimum number of MAYO tokens to buy back PAI
    uint256 public totalPAIBurned;

    // exlcude from fees and max transaction amount
    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) public _isExcludedMaxTransactionAmount;

    // store addresses that a automatic market maker pairs. Any transfer *to* these addresses
    // could be subject to a maximum transfer amount
    mapping(address => bool) public automatedMarketMakerPairs;

    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);

    event EnabledTrading();

    event RemovedLimits();

    event ExcludeFromFees(address indexed account, bool isExcluded);

    event UpdatedMaxBuyAmount(uint256 newAmount);

    event UpdatedMaxSellAmount(uint256 newAmount);

    event UpdatedMaxWalletAmount(uint256 newAmount);

    event UpdatedOperationsAddress(address indexed newWallet);

    event MaxTransactionExclusion(address _address, bool excluded);

    event BuyBackTriggered(uint256 amount);

    event OwnerForcedSwapBack(uint256 timestamp);

    event CaughtEarlyBuyer(address sniper);

    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiquidity);

    event TransferForeignToken(address token, uint256 amount);

    constructor() ERC20("Mayo Bear", "MAYO") {
        IDexRouter _dexRouter = IDexRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        dexRouter = _dexRouter;

        paiTokenAddress = 0xa0Cc4428FbB652C396F28DcE8868B8743742A71c; // PAI token address
        paiToken = IERC20(paiTokenAddress);

        multisig = 0x4871eAe23ECA5cE33ceff5e0366Ef5d585e13253; // multisig address
        address newOwner = multisig;

        // create pair
        lpPair = IDexFactory(_dexRouter.factory()).createPair(address(this), _dexRouter.WETH());
        _excludeFromMaxTransaction(address(lpPair), true);
        _setAutomatedMarketMakerPair(address(lpPair), true);

        uint256 totalSupply = 1 * 1e9 * 1e18;

        maxBuyAmount = totalSupply * 200 / 10_000;
        maxSellAmount = totalSupply * 200 / 10_000;
        maxWalletAmount = totalSupply * 200 / 10_000;
        swapTokensAtAmount = totalSupply * 5 / 10_000;

        buyOperationsFee = 0;
        buyLiquidityFee = 6;
        buyMarketingFee = 0;
        buyBurnFee = 0;
        buyPAIBuybackFee = 0;
        buyTotalFees =
            buyOperationsFee + buyLiquidityFee + buyMarketingFee + buyBurnFee + buyPAIBuybackFee;

        sellOperationsFee = 0;
        sellLiquidityFee = 6;
        sellMarketingFee = 0;
        sellBurnFee = 0;
        sellPAIBuybackFee = 0;
        sellTotalFees = sellOperationsFee + sellLiquidityFee + sellMarketingFee + sellBurnFee
            + sellPAIBuybackFee;

        _excludeFromMaxTransaction(newOwner, true);
        _excludeFromMaxTransaction(address(this), true);
        _excludeFromMaxTransaction(address(0xdead), true);

        excludeFromFees(newOwner, true);
        excludeFromFees(address(this), true);
        excludeFromFees(address(0xdead), true);

        operationsAddress = address(newOwner);
        marketingAddress = address(newOwner);

        _createInitialSupply(newOwner, totalSupply);
        transferOwnership(newOwner);
    }

    receive() external payable {}

    function enableTrading(uint256 deadBlocks) external onlyOwner {
        require(!tradingActive, "Cannot reenable trading");
        tradingActive = true;
        swapEnabled = true;
        tradingActiveBlock = block.number;
        blockForPenaltyEnd = tradingActiveBlock + deadBlocks;
        emit EnabledTrading();
    }

    // remove limits after token is stable
    function removeLimits() external onlyOwner {
        limitsInEffect = false;
        transferDelayEnabled = false;
        emit RemovedLimits();
    }

    function manageBoughtEarly(address wallet, bool flag) external onlyOwner {
        boughtEarly[wallet] = flag;
    }

    function massManageBoughtEarly(address[] calldata wallets, bool flag) external onlyOwner {
        for (uint256 i = 0; i < wallets.length; i++) {
            boughtEarly[wallets[i]] = flag;
        }
    }

    // disable Transfer delay - cannot be reenabled
    function disableTransferDelay() external onlyOwner {
        transferDelayEnabled = false;
    }

    function updateMaxBuyAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= (totalSupply() * 2 / 1000) / 1e18, "Cannot set max buy amount lower than 0.2%"
        );
        maxBuyAmount = newNum * (10 ** 18);
        emit UpdatedMaxBuyAmount(maxBuyAmount);
    }

    function updateMaxSellAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= (totalSupply() * 2 / 1000) / 1e18,
            "Cannot set max sell amount lower than 0.2%"
        );
        maxSellAmount = newNum * (10 ** 18);
        emit UpdatedMaxSellAmount(maxSellAmount);
    }

    function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= (totalSupply() * 3 / 1000) / 1e18,
            "Cannot set max wallet amount lower than 0.3%"
        );
        maxWalletAmount = newNum * (10 ** 18);
        emit UpdatedMaxWalletAmount(maxWalletAmount);
    }

    // change the minimum amount of tokens to sell from fees
    function updateSwapTokensAtAmount(uint256 newAmount) external onlyOwner {
        require(
            newAmount >= totalSupply() * 1 / 100_000,
            "Swap amount cannot be lower than 0.001% total supply."
        );
        require(
            newAmount <= totalSupply() * 1 / 1000,
            "Swap amount cannot be higher than 0.1% total supply."
        );
        swapTokensAtAmount = newAmount;
    }

    function _excludeFromMaxTransaction(address updAds, bool isExcluded) private {
        _isExcludedMaxTransactionAmount[updAds] = isExcluded;
        emit MaxTransactionExclusion(updAds, isExcluded);
    }

    function excludeFromMaxTransaction(address updAds, bool isEx) external onlyOwner {
        if (!isEx) {
            require(updAds != lpPair, "Cannot remove uniswap pair from max txn");
        }
        _isExcludedMaxTransactionAmount[updAds] = isEx;
    }

    function setAutomatedMarketMakerPair(address pair, bool value) external onlyOwner {
        require(pair != lpPair, "The pair cannot be removed from automatedMarketMakerPairs");

        _setAutomatedMarketMakerPair(pair, value);
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;

        _excludeFromMaxTransaction(pair, value);

        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function updateBuyFees(
        uint256 _operationsFee,
        uint256 _liquidityFee,
        uint256 _marketingFee,
        uint256 _burnFee,
        uint256 _PAIBuybackFee
    ) external onlyOwner {
        buyOperationsFee = _operationsFee;
        buyLiquidityFee = _liquidityFee;
        buyMarketingFee = _marketingFee;
        buyBurnFee = _burnFee;
        buyPAIBuybackFee = _PAIBuybackFee;
        buyTotalFees =
            buyOperationsFee + buyLiquidityFee + buyMarketingFee + buyBurnFee + buyPAIBuybackFee;
        require(buyTotalFees <= 10, "Must keep fees at 10% or less");
    }

    function updateSellFees(
        uint256 _operationsFee,
        uint256 _liquidityFee,
        uint256 _marketingFee,
        uint256 _burnFee,
        uint256 _PAIBuybackFee
    ) external onlyOwner {
        sellOperationsFee = _operationsFee;
        sellLiquidityFee = _liquidityFee;
        sellMarketingFee = _marketingFee;
        sellBurnFee = _burnFee;
        sellPAIBuybackFee = _PAIBuybackFee;
        sellTotalFees = sellOperationsFee + sellLiquidityFee + sellMarketingFee + sellBurnFee
            + sellPAIBuybackFee;
        require(sellTotalFees <= 10, "Must keep fees at 10% or less");
    }

    function returnToNormalTax() external onlyOwner {
        sellOperationsFee = 1;
        sellLiquidityFee = 1;
        sellMarketingFee = 2;
        sellBurnFee = 1;
        sellPAIBuybackFee = 1;
        sellTotalFees = sellOperationsFee + sellLiquidityFee + sellMarketingFee + sellBurnFee
            + sellPAIBuybackFee;
        require(sellTotalFees <= 10, "Must keep fees at 10% or less");

        buyOperationsFee = 1;
        buyLiquidityFee = 1;
        buyMarketingFee = 2;
        buyBurnFee = 1;
        buyPAIBuybackFee = 1;
        buyTotalFees =
            buyOperationsFee + buyLiquidityFee + buyMarketingFee + buyBurnFee + buyPAIBuybackFee;
        require(buyTotalFees <= 10, "Must keep fees at 10% or less");
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function _transfer(address from, address to, uint256 amount) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "amount must be greater than 0");

        if (!tradingActive) {
            require(_isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not active.");
        }

        if (blockForPenaltyEnd > 0) {
            require(
                !boughtEarly[from] || to == owner() || to == address(0xdead),
                "Bots cannot transfer tokens in or out except to owner or dead address."
            );
        }

        if (limitsInEffect) {
            if (
                from != owner() && to != owner() && to != address(0) && to != address(0xdead)
                    && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]
            ) {
                // at launch if the transfer delay is enabled, ensure the block timestamps for purchasers is set -- during launch.
                if (transferDelayEnabled) {
                    if (to != address(dexRouter) && to != address(lpPair)) {
                        require(
                            _holderLastTransferTimestamp[tx.origin] < block.number - 2
                                && _holderLastTransferTimestamp[to] < block.number - 2,
                            "_transfer:: Transfer Delay enabled.  Try again later."
                        );
                        _holderLastTransferTimestamp[tx.origin] = block.number;
                        _holderLastTransferTimestamp[to] = block.number;
                    }
                }

                //when buy
                if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
                    require(amount <= maxBuyAmount, "Buy transfer amount exceeds the max buy.");
                    require(amount + balanceOf(to) <= maxWalletAmount, "Cannot Exceed max wallet");
                }
                //when sell
                else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
                    require(amount <= maxSellAmount, "Sell transfer amount exceeds the max sell.");
                } else if (!_isExcludedMaxTransactionAmount[to]) {
                    require(amount + balanceOf(to) <= maxWalletAmount, "Cannot Exceed max wallet");
                }
            }
        }

        uint256 contractTokenBalance = balanceOf(address(this));

        bool canSwap = contractTokenBalance >= swapTokensAtAmount;

        if (
            canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from]
                && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]
        ) {
            swapping = true;

            swapBack();

            swapping = false;
        }

        bool takeFee = true;
        // if any account belongs to _isExcludedFromFee account then remove the fee
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }

        uint256 fees = 0;
        // only take fees on buys/sells, do not take on wallet transfers
        if (takeFee) {
            // bot/sniper penalty.
            if (
                earlyBuyPenaltyInEffect() && automatedMarketMakerPairs[from]
                    && !automatedMarketMakerPairs[to] && buyTotalFees > 0
            ) {
                if (!boughtEarly[to]) {
                    boughtEarly[to] = true;
                    botsCaught += 1;
                    emit CaughtEarlyBuyer(to);
                }

                fees = amount * 99 / 100;
                tokensForLiquidity += fees * buyLiquidityFee / buyTotalFees;
                tokensForOperations += fees * buyOperationsFee / buyTotalFees;
                tokensForMarketing += fees * buyMarketingFee / buyTotalFees;
                tokensForBurn += fees * buyBurnFee / buyTotalFees;
                tokensForPAIBuyback += fees * buyPAIBuybackFee / buyTotalFees;
            }
            // on sell
            else if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
                fees = amount * sellTotalFees / 100;
                tokensForLiquidity += fees * sellLiquidityFee / sellTotalFees;
                tokensForOperations += fees * sellOperationsFee / sellTotalFees;
                tokensForMarketing += fees * sellMarketingFee / sellTotalFees;
                tokensForBurn += fees * sellBurnFee / sellTotalFees;
                tokensForPAIBuyback += fees * sellPAIBuybackFee / sellTotalFees;
            }
            // on buy
            else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
                fees = amount * buyTotalFees / 100;
                tokensForLiquidity += fees * buyLiquidityFee / buyTotalFees;
                tokensForOperations += fees * buyOperationsFee / buyTotalFees;
                tokensForMarketing += fees * buyMarketingFee / buyTotalFees;
                tokensForBurn += fees * buyBurnFee / buyTotalFees;
                tokensForPAIBuyback += fees * buyPAIBuybackFee / buyTotalFees;
            }

            if (fees > 0) {
                super._transfer(from, address(this), fees);
            }

            amount -= fees;
        }

        super._transfer(from, to, amount);
    }

    function earlyBuyPenaltyInEffect() public view returns (bool) {
        return block.number < blockForPenaltyEnd;
    }

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

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

        // make the swap
        dexRouter.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(dexRouter), tokenAmount);

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

    function swapBack() private {
        if (tokensForBurn > 0 && balanceOf(address(this)) >= tokensForBurn) {
            _burn(address(this), tokensForBurn);
        }
        tokensForBurn = 0;

        uint256 contractBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = tokensForLiquidity + tokensForOperations + tokensForMarketing;

        if (contractBalance == 0 || totalTokensToSwap == 0) return;

        if (contractBalance > swapTokensAtAmount * 60) {
            contractBalance = swapTokensAtAmount * 60;
        }

        bool success;

        // Halve the amount of liquidity tokens
        uint256 liquidityTokens = contractBalance * tokensForLiquidity / totalTokensToSwap / 2;

        swapTokensForEth(contractBalance - liquidityTokens - tokensForPAIBuyback);

        uint256 ethBalance = address(this).balance;
        uint256 ethForLiquidity = ethBalance;

        uint256 ethForOperations =
            ethBalance * tokensForOperations / (totalTokensToSwap - (tokensForLiquidity / 2));
        uint256 ethForMarketing =
            ethBalance * tokensForMarketing / (totalTokensToSwap - (tokensForLiquidity / 2));

        ethForLiquidity -= ethForOperations + ethForMarketing;

        // handle PAI buyback
        swapMayoBearForPAI();

        // burn PAI tokens
        burnPAITokens();

        tokensForLiquidity = 0;
        tokensForOperations = 0;
        tokensForMarketing = 0;
        tokensForBurn = 0;

        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            addLiquidity(liquidityTokens, ethForLiquidity);
        }

        (success,) = address(marketingAddress).call{value: ethForMarketing}("");

        (success,) = address(operationsAddress).call{value: address(this).balance}("");
    }

    function transferForeignToken(address _token, address _to)
        external
        onlyOwner
        returns (bool _sent)
    {
        require(_token != address(0), "_token address cannot be 0");
        require(_token != address(this), "Can't withdraw native tokens");
        uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
        _sent = IERC20(_token).transfer(_to, _contractBalance);
        emit TransferForeignToken(_token, _contractBalance);
    }

    // withdraw ETH if stuck or someone sends to the address
    function withdrawStuckETH() external onlyOwner {
        bool success;
        (success,) = address(msg.sender).call{value: address(this).balance}("");
    }

    function setOperationsAddress(address _operationsAddress) external onlyOwner {
        require(_operationsAddress != address(0), "_operationsAddress address cannot be 0");
        operationsAddress = payable(_operationsAddress);
    }

    function setMarketingAddress(address _marketingAddress) external onlyOwner {
        require(_marketingAddress != address(0), "_marketingAddress address cannot be 0");
        marketingAddress = payable(_marketingAddress);
    }

    // force Swap back if slippage issues.
    function forceSwapBack() external onlyOwner {
        require(
            balanceOf(address(this)) >= swapTokensAtAmount,
            "Can only swap when token amount is at or higher than restriction"
        );
        swapping = true;
        swapBack();
        swapping = false;
        emit OwnerForcedSwapBack(block.timestamp);
    }

    // useful for buybacks or to reclaim any ETH on the contract in a way that helps holders.
    function buyBackTokens(uint256 amountInWei) external onlyOwner {
        require(
            amountInWei <= 10 ether,
            "May not buy more than 10 ETH in a single buy to reduce sandwich attacks"
        );

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

        // make the swap
        dexRouter.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amountInWei}(
            0, // accept any amount of Ethereum
            path,
            address(0xdead),
            block.timestamp
        );
        emit BuyBackTriggered(amountInWei);
    }

    function swapMayoBearForPAI() private {
        uint256 swapAmount = tokensForPAIBuyback;
        if (swapAmount >= paiBuybackThreshold) {
            tokensForPAIBuyback = 0; // Reset the counter

            address[] memory path = new address[](3);
            path[0] = address(this);
            path[1] = dexRouter.WETH();
            path[2] = paiTokenAddress;

            _approve(address(this), address(dexRouter), swapAmount);

            // Make the swap
            dexRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
                swapAmount,
                0, // accept any amount of PAI
                path,
                address(this), // Contract holds the PAI
                block.timestamp
            );
        }
    }

    function burnPAITokens() private {
        uint256 paiBalance = paiToken.balanceOf(address(this));

        if (paiBalance > 0) {
            paiToken.approve(address(this), paiBalance);
            paiToken.transferFrom(address(this), address(0xdEaD), paiBalance);
            totalPAIBurned += paiBalance;
        }
    }
}