// Website: https://xerc20.pro/
// CMC : https://coinmarketcap.com/currencies/xerc20-pro/
// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.19;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
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 
        return msg.data;
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;
    address private _previousOwner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

     /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Interface of the token standard as defined in the EIP.
 */
interface IToken {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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/solidity/issues/2691 
     * 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522        
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

interface IDexFactory {
    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 IDexPair {
    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 IDexRouter01 {
    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 IDexRouter02 is IDexRouter01 {
    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 XSwap is IToken, Ownable {
    using SafeMath for uint256;
    
    mapping (address => uint256) private _reflections;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    
    mapping (address => bool) private _isExcludedFromFee;

    mapping (address => bool) private _isExcluded;
    address[] private _excluded;

    uint256 private constant MAX = ~uint256(0);
    uint256 private constant _totalSupply = 10 * 10**6 * 10**9;
    uint256 private _reflectionTotal = (MAX - (MAX % _totalSupply));
    uint256 private _takeFeeTotal;

    string private constant _name = "XSwap";
    string private constant _symbol = "XSWAP";
    uint8 private constant _decimals = 9;

    uint256 public _taxFee = 2;
    uint256 private _previousTaxFee = _taxFee;

    uint256 public _liquidityFee = 2;
    uint256 private _previousLiquidityFee = _liquidityFee;

    IDexRouter02 public dexRouter;
    address public dexPair;

    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;

    uint256 public _maxTransactionAmount = 500 * 10**6 * 10**9;
    uint256 private _tokensToAddToLiquidity = 1 * 10**6 * 10**9;

    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
    event SwapAndLiquifyEnabledUpdated(bool enabled);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 nativeReceived,
        uint256 tokensIntoLiquidity
    );

    modifier lockTheSwap {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false; 
    }

    constructor() {
        _reflections[_msgSender()] = _reflectionTotal;
        IDexRouter02 _dexRouter = IDexRouter02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
         // Create a swap pair for this new token
        dexPair = IDexFactory(_dexRouter.factory())
            .createPair(address(this), _dexRouter.WETH());

        // set the rest of the contract variables
        dexRouter = _dexRouter;

        //exclude owner and this contract from fee
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        
        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public pure returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public pure 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 default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {Token-balanceOf} and {Token-transfer}.
     */
    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {Token-totalSupply}.
     */
    function totalSupply() public pure returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {Token-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcluded[account]) return _balances[account];
        return tokensfromreflection(_reflections[account]);
    }

    /**
     * @dev See {Token-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), to, amount);
        return true;
    }

    /**
     * @dev See {Token-allowance}.
     */
    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {Token-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {Token-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {Token}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public override returns (bool) {
        _transfer(from, to, amount);
        _approve(from, _msgSender(), _allowances[from][_msgSender()].sub(amount, "Token: transfer amount exceeds allowance"));
        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 {IToken-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].add(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 {IToken-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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "Token: decreased allowance below zero"));
        return true;
    }

    function isExcludedFromReward(address account) public view returns (bool) {
        return _isExcluded[account];
    }

    function totalFees() public view returns (uint256) {
        return _takeFeeTotal;
    }

    function minimumTokenAmountBeforeSwap() public view returns (uint256) {
        return _tokensToAddToLiquidity;
    }

    function deliver(uint256 totalAmount) public {
        address from = _msgSender();
        require(!_isExcluded[from], "Excluded addresses cannot call this function");
        (uint256 reflectionAmount,,,,,) = _getValues(totalAmount);
        _reflections[from] = _reflections[from].sub(reflectionAmount);
        _reflectionTotal = _reflectionTotal.sub(reflectionAmount);
        _takeFeeTotal = _takeFeeTotal.add(totalAmount);
    }

    function reflectionFromToken(uint256 totalAmount, bool deductTransferFee) public view returns (uint256) {
        require(totalAmount <= _totalSupply, "Amount must be less than supply");
        if (!deductTransferFee) {
            (uint256 reflectionAmount,,,,,) = _getValues(totalAmount);
            return reflectionAmount;
        } else {
            (,uint256 reflectedTransferAmount,,,,) = _getValues(totalAmount);
            return reflectedTransferAmount;
        }
    }

    function tokensfromreflection(uint256 reflectionAmount) public view returns (uint256) {
        require(reflectionAmount <= _reflectionTotal, "Amount must be less than total reflections");
        uint256 currentRate =  _getRate();
        return reflectionAmount.div(currentRate);
    }

    function excludeFromReward(address account) public onlyOwner {
        require(!_isExcluded[account], "Account is not excluded");
        require(_excluded.length <= 50, "Excluded list is too long!");
            if (_reflections[account] > 0) {
                _balances[account] = tokensfromreflection(_reflections[account]);
            }
            _isExcluded[account] = true;
            _excluded.push(account);
    }

    function includeInReward(address account) external onlyOwner() {
        require(_isExcluded[account], "Account is not excluded");
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_excluded[i] == account) {
                _excluded[i] = _excluded[_excluded.length - 1];
                uint256 currentRate = _getRate();
                _reflections[account] = _balances[account].mul(currentRate);
                _balances[account] = 0;
                _isExcluded[account] = false;
                _excluded.pop();
                break;
            }
        }
    }
  
    function _transferBothExcluded(address from, address to, uint256 totalAmount) private {
        (uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
        _balances[from] = _balances[from].sub(totalAmount);
        _reflections[from] = _reflections[from].sub(reflectionAmount);
        _balances[to] = _balances[to].add(totalTransferAmount);
        _reflections[to] = _reflections[to].add(reflectedTransferAmount);        
        _reflectFee(reflectionFee, taxedFee);
        _takeLiquidity(takeLiquidity);
        emit Transfer(from, to, totalTransferAmount);
    }

    function excludeFromFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = true;
    }

    function includeInFee(address account) public onlyOwner {
        _isExcludedFromFee[account] = false;
    }

    function setTaxFeePercent(uint256 taxFee) external onlyOwner {
        _taxFee = taxFee;
    }

    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner {
        _liquidityFee = liquidityFee;
    }

    function setMaxTransactionAmount(uint256 maxTransactionAmount) external onlyOwner {
        _maxTransactionAmount = maxTransactionAmount;
    }

    function setTokensToAddToLiquidity(uint256 minimumTokensBeforeSwap) external onlyOwner() {
        _tokensToAddToLiquidity = minimumTokensBeforeSwap;
    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
        swapAndLiquifyEnabled = _enabled;
        emit SwapAndLiquifyEnabledUpdated(_enabled);
    }

    // recieve native currency from active router when swapping
    receive() external payable {}

    function _reflectFee(uint256 reflectionFee, uint256 taxedFee) private {
        _reflectionTotal = _reflectionTotal.sub(reflectionFee);
        _takeFeeTotal = _takeFeeTotal.add(taxedFee);
    }

    function _getValues(uint256 totalAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getTValues(totalAmount);
        (uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee) = _getRValues(totalAmount, taxedFee, takeLiquidity, _getRate());
        return (reflectionAmount, reflectedTransferAmount, reflectionFee, totalTransferAmount, taxedFee, takeLiquidity);
    }

    function _getTValues(uint256 totalAmount) private view returns (uint256, uint256, uint256) {
        uint256 taxedFee = calculateTaxFee(totalAmount);
        uint256 takeLiquidity = calculateLiquidityFee(totalAmount);
        uint256 totalTransferAmount = totalAmount.sub(taxedFee).sub(takeLiquidity);
        return (totalTransferAmount, taxedFee, takeLiquidity);
    }

    function _getRValues(uint256 totalAmount, uint256 taxedFee, uint256 takeLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 reflectionAmount = totalAmount.mul(currentRate);
        uint256 reflectionFee = taxedFee.mul(currentRate);
        uint256 reflectionsLiquidity = takeLiquidity.mul(currentRate);
        uint256 reflectedTransferAmount = reflectionAmount.sub(reflectionFee).sub(reflectionsLiquidity);
        return (reflectionAmount, reflectedTransferAmount, reflectionFee);
    }

    function _getRate() private view returns (uint256) {
        (uint256 reflectionSupply, uint256 tokenSupply) = _getCurrentSupply();
        return reflectionSupply.div(tokenSupply);
    }

    function _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 reflectionSupply = _reflectionTotal;
        uint256 tokenSupply = _totalSupply;
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_reflections[_excluded[i]] > reflectionSupply || _balances[_excluded[i]] > tokenSupply) return (_reflectionTotal, _totalSupply);
            reflectionSupply = reflectionSupply.sub(_reflections[_excluded[i]]);
            tokenSupply = tokenSupply.sub(_balances[_excluded[i]]);
        }
        if (reflectionSupply < _reflectionTotal.div(_totalSupply)) return (_reflectionTotal, _totalSupply);
        return (reflectionSupply, tokenSupply);
    }

    function _takeLiquidity(uint256 takeLiquidity) private {
        uint256 currentRate = _getRate();
        uint256 reflectionsLiquidity = takeLiquidity.mul(currentRate);
        _reflections[address(this)] = _reflections[address(this)].add(reflectionsLiquidity);
        if(_isExcluded[address(this)])
            _balances[address(this)] = _balances[address(this)].add(takeLiquidity);
    }

    function calculateTaxFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_taxFee).div(10**2);
    }

    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
        return _amount.mul(_liquidityFee).div(10**2);
    }

    function removeAllFee() private {
        if(_taxFee == 0 && _liquidityFee == 0) return;

        _previousTaxFee = _taxFee;
        _previousLiquidityFee = _liquidityFee;

        _taxFee = 0;
        _liquidityFee = 0;
    }

    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _liquidityFee = _previousLiquidityFee;
    }

    function isExcludedFromFee(address account) public view returns (bool) {
        return _isExcludedFromFee[account];
    }

    /**
     * @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) private {
        require(owner != address(0), "Token: approve from the zero address");
        require(spender != address(0), "Token: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

   /**
     * @dev Moves tokens `amount` from `from` to `to`.
     *
     * 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "Token: transfer from the zero address");
        require(to != address(0), "Token: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        if(from != owner() && to != owner())
            require(amount <= _maxTransactionAmount, "Transfer amount exceeds the maxTransactionAmount.");

        // is the token balance of this contract address over the min number of
        // tokens that we need to initiate a swap + liquidity lock?
        // also, don't get caught in a circular liquidity event.
        // also, don't swap & liquify if from is dex pair.
        uint256 contractTokenBalance = balanceOf(address(this));

        if(contractTokenBalance >= _maxTransactionAmount)
        {
            contractTokenBalance = _maxTransactionAmount;
        }

        bool overMinTokenBalance = contractTokenBalance >= _tokensToAddToLiquidity;
        if (
            overMinTokenBalance &&
            !inSwapAndLiquify &&
            from != dexPair &&
            swapAndLiquifyEnabled
        ) {
            contractTokenBalance = _tokensToAddToLiquidity;
            // add liquidity
            swapAndLiquify(contractTokenBalance);
        }

        // indicates if fee should be deducted from transfer
        bool takeFee = true;

        // if any account belongs to _isExcludedFromFee account then remove the fee
        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }

        // transfer amount, it will take tax, burn, liquidity fee
        _tokenTransfer(from, to, amount, takeFee);
    }

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
        // split the contract balance into halves
        uint256 half = contractTokenBalance.div(2);
        uint256 otherHalf = contractTokenBalance.sub(half);

        // capture the contract's current native balance.
        // this is so that we can capture exactly the amount of native that the
        // swap creates, and not make the liquidity event include any native that
        // has been manually sent to the contract
        uint256 initialBalance = address(this).balance;

        // swap tokens for native currency
        swapTokensForNative(half); // <- this breaks the native currency -> swap when swap and liquify is triggered

        // how much native currency did we just swap into?
        uint256 newBalance = address(this).balance.sub(initialBalance);

        // add liquidity to swap
        addLiquidity(otherHalf, newBalance);

        emit SwapAndLiquify(half, newBalance, otherHalf);
    }
    
    function swapTokensForNative(uint256 tokenAmount) private {
        // generate the swap pair path of token -> wrapped native currency        
        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 native currency
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 nativeAmount) private {
        // approve token transfer to cover all possible scenarios        
        _approve(address(this), address(dexRouter), tokenAmount);

        // add the liquidity
        dexRouter.addLiquidityETH{value: nativeAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            address(this),
            block.timestamp
        );
    }

    // this method is responsible for taking all fee, if takeFee is true
    function _tokenTransfer(address from, address to, uint256 amount, bool takeFee) private {
        if(!takeFee)
            removeAllFee();

        if (_isExcluded[from] && !_isExcluded[to]) {
            _transferFromExcluded(from, to, amount);
        } else if (!_isExcluded[from] && _isExcluded[to]) {
            _transferToExcluded(from, to, amount);
        } else if (_isExcluded[from] && _isExcluded[to]) {
            _transferBothExcluded(from, to, amount);
        } else {
            _transferStandard(from, to, amount);
        }

        if(!takeFee)
            restoreAllFee();
    }

    function _transferStandard(address from, address to, uint256 totalAmount) private {
        (uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
        _reflections[from] = _reflections[from].sub(reflectionAmount);
        _reflections[to] = _reflections[to].add(reflectedTransferAmount);
        _takeLiquidity(takeLiquidity);
        _reflectFee(reflectionFee, taxedFee);
        emit Transfer(from, to, totalTransferAmount);
    }   
    
    function _transferToExcluded(address from, address to, uint256 totalAmount) private {
        (uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
        _reflections[from] = _reflections[from].sub(reflectionAmount);
        _balances[to] = _balances[to].add(totalTransferAmount);
        _reflections[to] = _reflections[to].add(reflectedTransferAmount);
        _takeLiquidity(takeLiquidity);
        _reflectFee(reflectionFee, taxedFee);
        emit Transfer(from, to, totalTransferAmount);
    }

    function _transferFromExcluded(address from, address to, uint256 totalAmount) private {
        (uint256 reflectionAmount, uint256 reflectedTransferAmount, uint256 reflectionFee, uint256 totalTransferAmount, uint256 taxedFee, uint256 takeLiquidity) = _getValues(totalAmount);
        _balances[from] = _balances[from].sub(totalAmount);
        _reflections[from] = _reflections[from].sub(reflectionAmount);
        _reflections[to] = _reflections[to].add(reflectedTransferAmount);   
        _takeLiquidity(takeLiquidity);
        _reflectFee(reflectionFee, taxedFee);
        emit Transfer(from, to, totalTransferAmount);
    }

    function setRouterAddress(address newRouter) public onlyOwner() {
        IDexRouter02 _newRouter = IDexRouter02(newRouter);
        dexPair = IDexFactory(_newRouter.factory()).createPair(address(this), _newRouter.WETH());
        dexRouter = _newRouter;
    }

    function getNativeCurrencyQuantity() public view returns (uint256) {
        return address(this).balance;        
    }  

    function getNativeCurrency() external onlyOwner() {
        uint256 balance = address(this).balance;
        payable(owner()).transfer(balance);
    }

    function rescueTokens(address _tokenContract, uint256 _amount) external onlyOwner {
        IToken tokenContract = IToken(_tokenContract);
        tokenContract.transfer(msg.sender, _amount);
    }
}