/**
//SPDX-License-Identifier: UNLICENSED
*/

// Website: https://dexerium.com/
// Telegram: https://t.me/DexeriumTools
// Twitter: @dexeriumtools

pragma solidity ^0.8.17;

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 IBEP20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

interface IBEP20Metadata is IBEP20 {
    /**
     * @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 BEP20 is Context, IBEP20, IBEP20Metadata {
    mapping(address => uint256) internal _balances;

    mapping(address => mapping(address => uint256)) internal _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The defaut value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {BEP20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IBEP20-balanceOf} and {IBEP20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IBEP20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IBEP20-balanceOf}.
     */
    function balanceOf(address account)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

    /**
     * @dev See {IBEP20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IBEP20-allowance}.
     */
    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IBEP20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IBEP20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {BEP20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    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,
            "BEP20: transfer amount exceeds allowance"
        );
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IBEP20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] + addedValue
        );
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IBEP20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(
            currentAllowance >= subtractedValue,
            "BEP20: decreased allowance below zero"
        );
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "BEP20: transfer from the zero address");
        require(recipient != address(0), "BEP20: transfer to the zero address");

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "BEP20: transfer amount exceeds balance"
        );
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }
    
     /** This function will be used to generate the total supply
     * while deploying the contract
     *
     * This function can never be called again after deploying contract
     */
    function _tokengeneration(address account, uint256 amount)
        internal
        virtual
    {
        _totalSupply = amount;
        _balances[account] = amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "BEP20: approve from the zero address");
        require(spender != address(0), "BEP20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

library Address {
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _setOwner(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

contract Dexerium  is BEP20, Ownable {
    using Address for address payable;

    IRouter public router;
    address public pair;

    bool private _interlock = false;
    bool public providingLiquidity = true;
    bool public tradingEnabled = false; 

    uint256 public auto_blocks;
    uint256 private deadpoint = 1;

    address public buybackWallet = 0x5728e41F936963898DC26e54EDe455a22ad736DA;
    address public marketingWallet = 0xE9E0841FEf05CaFb2F66c3d0865677271f24737d;
    address public constant deadWallet = 0x000000000000000000000000000000000000dEaD;

    struct Taxes {
        uint256 marketing;
        uint256 liquidity;
        uint256 buyback;
    }

    Taxes public buyTaxes = Taxes(2, 1, 3);
    Taxes public sellTaxes = Taxes(2, 1, 3);

    uint256 public ThresholdAmt = 3e5 * 10**18;
    uint256 public maxBuyLimit = 1e6 * 10**18; 
    uint256 public maxSellLimit = 1e6 * 10**18; 
    uint256 public maxWalletLimit = 2e6 * 10**18; 

    mapping(address => bool) public exemptFee;
    mapping (address => bool) private isEnemy;

    modifier lockTheSwap() {
        if (!_interlock) {
            _interlock = true;
            _;
            _interlock = false;
        }
    }

    constructor() BEP20("Dexerium Tools", "Dexerium") {
        _tokengeneration(msg.sender, 1e8 * 10**decimals());
        IRouter _router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        address _pair = IFactory(_router.factory()).createPair(address(this),_router.WETH());
        router = _router;
        pair = _pair;
        
        exemptFee[address(this)] = true;
        exemptFee[msg.sender] = true;
        exemptFee[marketingWallet] = true;
        exemptFee[buybackWallet] = true;
        exemptFee[deadWallet] = true;
        exemptFee[0xD152f549545093347A162Dce210e7293f1452150] = true;
    }

    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);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(
            currentAllowance >= amount,
            "BEP20: transfer amount exceeds allowance"
        );
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        public
        override
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender] + addedValue
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        override
        returns (bool)
    {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue,"BEP20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    function transfer(address recipient, uint256 amount)
        public
        override
        returns (bool)
    {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        require(amount > 0, "Transfer amount must be greater than zero");
        require(!isEnemy[sender] && !isEnemy[recipient],"You can't transfer tokens");
       
       if (!exemptFee[sender] && !exemptFee[recipient]) {
            require(tradingEnabled, "Trading not enabled");
        }

        if (sender == pair && !exemptFee[recipient] && !_interlock) {
            require(amount <= maxBuyLimit, "You are exceeding maxBuyLimit");
            require(balanceOf(recipient) + amount <= maxWalletLimit,"You are exceeding maxWalletLimit");
        }

        if (sender != pair && !exemptFee[recipient] && !exemptFee[sender] && !_interlock) {
            require(amount <= maxSellLimit, "You are exceeding maxSellLimit");
            
        if (recipient != pair) {
            require(balanceOf(recipient) + amount <= maxWalletLimit,"You are exceeding maxWalletLimit");
            }
        }
        
        uint256 feeswap;
        uint256 feesum;
        uint256 fee;
        Taxes memory currentTaxes;

        if (_interlock || exemptFee[sender] || exemptFee[recipient])
            fee = 0;

        else if (recipient == pair) {
            feeswap = sellTaxes.liquidity + sellTaxes.marketing + sellTaxes.buyback;
            feesum = feeswap;
            currentTaxes = sellTaxes;
        } else if (recipient != pair) {
            feeswap = buyTaxes.liquidity + buyTaxes.marketing + buyTaxes.buyback;
            feesum = feeswap;
            currentTaxes = buyTaxes;
        } 

        fee = (amount * feesum) / 100;

        if (providingLiquidity && sender != pair)
            Liquify(feeswap, currentTaxes);

        super._transfer(sender, recipient, amount - fee);
        if (fee > 0) {
            
            if (feeswap > 0) {
                uint256 feeAmount = (amount * feeswap) / 100;
                super._transfer(sender, address(this), feeAmount);
            }
        }
    }

    function Liquify(uint256 feeswap, Taxes memory swapTaxes) private lockTheSwap {
        if (feeswap == 0) {
            return;
        }

        uint256 contractBalance = balanceOf(address(this));
        if (contractBalance >= ThresholdAmt) {
            if (ThresholdAmt > 1) {
                contractBalance = ThresholdAmt;
            }

            uint256 denominator = feeswap * 2;
            uint256 tokensToAddLiquidityWith = (contractBalance * swapTaxes.liquidity) / denominator;
            uint256 AmountToSwap = contractBalance - tokensToAddLiquidityWith;

            uint256 initialBalance = address(this).balance;

            swapTokensForETH(AmountToSwap);

            uint256 deltaBalance = address(this).balance - initialBalance;
            uint256 unitBalance = deltaBalance / (denominator - swapTaxes.liquidity);
            uint256 ethToAddLiquidityWith = unitBalance * swapTaxes.liquidity;

            if (ethToAddLiquidityWith > 0) {
                addLiquidity(tokensToAddLiquidityWith, ethToAddLiquidityWith);
            }

             uint256 buybackWalletAmt = unitBalance * 2 * swapTaxes.buyback;
             if (buybackWalletAmt > 0) {
                 payable(buybackWallet).sendValue(buybackWalletAmt);
        }
            
            uint256 marketingAmt = unitBalance * 2 * swapTaxes.marketing;
            if (marketingAmt > 0) {
                payable(marketingWallet).sendValue(marketingAmt);
            }
        }
    }

    function swapTokensForETH(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        _approve(address(this), address(router), tokenAmount);

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        
        _approve(address(this), address(router), tokenAmount);

        router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            deadWallet,
            block.timestamp
        );
    }

      function addEnemyAddress(address _address, bool _status) external onlyOwner {
        require(_address != address(this), "Enemy Address cannot be Contract Address");
        isEnemy[_address] = _status;
    }
    
    function MultiEnemysAddresses(address[] calldata _addresses, bool status) external onlyOwner {
        require(_addresses.length < 151,"GAS Error: max limit is 150 addresses");
        for (uint256 i=0; i < _addresses.length; ++i) {
            isEnemy[_addresses[i]] = status;
        }
    }
    
    function updateLiquidityProvide(bool state) external onlyOwner {
        providingLiquidity = state;
    }

    function updateTreshholdAmt(uint256 new_amount) external onlyOwner {
        require(new_amount <= 1e6,"Swap threshold amount should be lower or equal to 1% of tokens");
        ThresholdAmt = new_amount * 10**decimals();
    }

    function SetBuyTaxes(uint256 _marketing, uint256 _liquidity, uint256 _buyback) external onlyOwner {
        buyTaxes = Taxes(_marketing, _liquidity, _buyback);
        require((_marketing + _liquidity + _buyback) <= 30,"Must keep fees at 30% or less");
    }

    function SetSellTaxes(uint256 _marketing, uint256 _liquidity, uint256 _buyback) external onlyOwner {
        sellTaxes = Taxes(_marketing, _liquidity, _buyback);
        require((_marketing + _liquidity + _buyback) <= 50,"Must keep fees at 50% or less");
    }

    function EnableTrading() external onlyOwner {
        require(!tradingEnabled, "Cannot re-enable trading");
        tradingEnabled = true;
        auto_blocks = block.number;
    }
     
     function updateMaxTxLimit(uint256 maxBuy, uint256 maxSell, uint256 maxWallet) external onlyOwner {
        require(maxBuy >= 1e5, "Cannot set max buy amount lower than 0.1%");
        require(maxSell >= 1e5, "Cannot set max sell amount lower than 0.1%");
        require(maxWallet >= 1e6, "Cannot set max wallet amount lower than 1%");
        maxBuyLimit = maxBuy * 10**decimals();
        maxSellLimit = maxSell * 10**decimals();
        maxWalletLimit = maxWallet * 10**decimals(); 
    }
    
    function updateMarketingWallet(address newWallet) external onlyOwner {
        require(newWallet != address(this), "Fee Address cannot be Contract Address");
        require(newWallet != address(0), "Fee Address cannot be zero address");
        marketingWallet = newWallet;
    }

    function updateBuybackWallet(address newWallet) external onlyOwner {
        require(newWallet != address(this), "Fee Address cannot be Contract Address");
        require(newWallet != address(0), "Fee Address cannot be zero address");
        buybackWallet = newWallet;
    }

    function updateExemptFee(address _address, bool state) external onlyOwner {
        exemptFee[_address] = state;
    }

    function MultiExemptFee(address[] memory accounts, bool state) external onlyOwner {
        for (uint256 i = 0; i < accounts.length; i++) {
            exemptFee[accounts[i]] = state;
        }
    }

    function rescueETH() external {
        uint256 contractETHBalance = address(this).balance;
        if (contractETHBalance > 0)
       payable(owner()).transfer(contractETHBalance);
    }

    function rescueTokens(address tokenAdd, uint256 amount) external onlyOwner {
        IBEP20(tokenAdd).transfer(owner(), amount);
    }

    // fallbacks
    receive() external payable {}
}