// SPDX-License-Identifier: MIT
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 `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/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 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);
}


// Dependency file: @openzeppelin/contracts/utils/math/SafeMath.sol

// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)

// pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // 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 (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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) {
        return a + b;
    }

    /**
     * @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 a - b;
    }

    /**
     * @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) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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 a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}


// Dependency file: @openzeppelin/contracts/utils/Context.sol

// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

// pragma solidity ^0.8.0;

/**
 * @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) {
        return msg.data;
    }
}


// Dependency file: @openzeppelin/contracts/access/Ownable.sol

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/utils/Context.sol";

/**
 * @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.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual 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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


// Dependency file: @openzeppelin/contracts/utils/Address.sol

// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

// pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    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");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// Dependency file: contracts/interfaces/IUniswapV2Factory.sol

// pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    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(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}


// Dependency file: contracts/interfaces/IUniswapV2Pair.sol

// pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 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 (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 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 (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    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 (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}


// Dependency file: contracts/interfaces/IUniswapV2Router01.sol

// pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}


// Dependency file: contracts/interfaces/IUniswapV2Router02.sol

// pragma solidity >=0.6.2;

// import "contracts/interfaces/IUniswapV2Router01.sol";

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        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 swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}


// Dependency file: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// Dependency file: contracts/parts/Withdrawable.sol


// pragma solidity ^0.8.9;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

abstract contract Withdrawable {
    using SafeERC20 for IERC20;
    using Address for address;

    event WithdrawToken(address token, address recipient, uint256 amount);
    event Withdraw(address recipient, uint256 amount);

    function _deliverFunds(
        address _recipient,
        uint256 _value,
        string memory _message
    ) internal {
        (bool sent, ) = payable(_recipient).call{value: _value}("");

        require(sent, _message);
    }

    function _deliverTokens(
        address _token,
        address _recipient,
        uint256 _value
    ) internal {
        IERC20(_token).safeTransfer(_recipient, _value);
    }

    function _withdraw(address _recipient, uint256 _amount) internal virtual {
        require(_recipient != address(0x0), "Withdraw: address is zero");
        require(
            _amount <= address(this).balance,
            "Withdraw: not enought ETH balance"
        );

        _afterWithdraw(_recipient, _amount);

        _deliverFunds(_recipient, _amount, "Withdraw: Can't send ETH");
        emit Withdraw(_recipient, _amount);
    }

    function _afterWithdraw(address _recipient, uint256 _amount)
        internal
        virtual
    {}

    function _withdrawToken(
        address _token,
        address _recipient,
        uint256 _amount
    ) internal virtual {
        require(_recipient != address(0x0), "Withdraw: address is zero");
        require(
            _amount <= IERC20(_token).balanceOf(address(this)),
            "Withdraw: not enought token balance"
        );

        IERC20(_token).safeTransfer(_recipient, _amount);

        _afterWithdrawToken(_token, _recipient, _amount);

        emit WithdrawToken(_token, _recipient, _amount);
    }

    function _afterWithdrawToken(
        address _token,
        address _recipient,
        uint256 _amount
    ) internal virtual {}
}


// Root file: contracts/EdFi.sol

pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/utils/math/SafeMath.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";
// import "@openzeppelin/contracts/utils/Address.sol";
// import "contracts/interfaces/IUniswapV2Factory.sol";
// import "contracts/interfaces/IUniswapV2Pair.sol";
// import "contracts/interfaces/IUniswapV2Router02.sol";
// import "contracts/parts/Withdrawable.sol";

contract EdFi is Context, IERC20, Withdrawable, Ownable {
    using SafeMath for uint256;
    using Address for address;

    // dead address
    address internal constant DEAD_ADDRESS =
        0x000000000000000000000000000000000000dEaD;

    uint256 internal constant PRECISION = 1 ether;

    //user balances multiplied reward
    mapping(address => uint256) private _rOwned;

    //user original balances
    mapping(address => uint256) private _tOwned;

    //allowances
    mapping(address => mapping(address => uint256)) private _allowances;

    //bots
    mapping(address => bool) private _isSniper;

    address[] private _confirmedSnipers;

    //excluded from fees
    mapping(address => bool) private _isExcludedFee;

    //excluded from rewards
    mapping(address => bool) private _isExcludedReward;

    //excluded array
    address[] private _excluded;

    string private constant _name = "EdFi";
    string private constant _symbol = "EdFi";
    uint8 private constant _decimals = 18;

    //max uint256
    uint256 private constant MAX = ~uint256(0);

    //total supply
    uint256 private constant _tTotal = 1_000_000_000 ether;

    //total with rewards
    uint256 private _rTotal = (MAX - (MAX % _tTotal));

    //total fees
    uint256 private _tFeeTotal;

    //Fees

    //reflection fee
    uint256 public reflectionFee;
    uint256 private _previousReflectFee;

    //treasury fee
    uint256 public treasuryFee;
    uint256 private _previousTreasuryFee;

    //Liquify fee
    uint256 public liquidityFee;
    uint256 private _previousLiquidityFee;

    //fee rate for minimum fees balance
    uint256 public feeRate;

    //launch time
    uint256 public launchTime;

    //uint256

    IUniswapV2Router02 public uniswapRouter;
    address public uniswapPair;
    mapping(address => bool) private _isUniswapPair;

    address public treasuryWallet;

    //burn address
    address public buybackReceiver = DEAD_ADDRESS;

    bool private _isSelling;
    bool private _tradingOpen;
    bool private _transferOpen;

    bool private _takeFeeOnTransferEnabled;
    bool private _takeFeeOnBuyEnabled;
    bool private _takeFeeOnSellEnabled;

    uint256 public maxSellAmount = 5 ether;

    mapping(address => bool) public authorized;

    modifier isAuthorized() {
        require(
            (authorized[_msgSender()] || owner() == _msgSender()),
            "EdFi Token: not authorized user"
        );
        _;
    }

    event SwapETHForTokens(address whereTo, uint256 amountIn, address[] path);
    event SwapTokensForETH(uint256 amountIn, address[] path);
    event SwapAndLiquify(uint256 ETHAddedForLp, uint256 tokensAddedForLp);
    event Authorized(address user, bool isAuth);

    constructor() {
        //mint to tokens to sender
        _rOwned[_msgSender()] = _rTotal;
        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    function init(
        address _routerAddress,
        address _treasuryAddress,
        uint256 _reflectionFee,
        uint256 _treasuryFee,
        uint256 _liquidityFee,
        uint256 _feeRate
    ) external onlyOwner {
        treasuryWallet = _treasuryAddress;

        IUniswapV2Router02 _uniswapRouter = IUniswapV2Router02(
            _routerAddress
        );
        uniswapPair = IUniswapV2Factory(_uniswapRouter.factory())
            .createPair(address(this), _uniswapRouter.WETH());

        uniswapRouter = _uniswapRouter;

        //exclude owner from fees
        _isExcludedFee[owner()] = true;

        //exclude this contract from fees
        _isExcludedFee[address(this)] = true;

        require(
            _reflectionFee <= 100 &&
            _treasuryFee <= 100 &&
            _liquidityFee <= 100 &&
            _feeRate <= 100,
            "fee cannot exceed 100%"
        );

        reflectionFee = _reflectionFee;
        _previousReflectFee = reflectionFee;

        treasuryFee = _treasuryFee;
        _previousTreasuryFee = treasuryFee;

        liquidityFee = _liquidityFee;
        _previousLiquidityFee = liquidityFee;

        feeRate = _feeRate;
    }

    /// @notice start trading
    function openTrading() external onlyOwner {
        _tradingOpen = true;
        _transferOpen = true;
        launchTime = block.timestamp;

        _takeFeeOnTransferEnabled = false;
        _takeFeeOnBuyEnabled = true;
        _takeFeeOnSellEnabled = true;
    }

    function authorize(address _user, bool _isAuth) external onlyOwner {
        authorized[_user] = _isAuth;

        emit Authorized(_user, _isAuth);
    }

    /// @notice token name
    function name() external pure returns (string memory) {
        return _name;
    }

    /// @notice symbol
    function symbol() external pure returns (string memory) {
        return _symbol;
    }

    /// @notice decimals
    function decimals() external pure returns (uint8) {
        return _decimals;
    }

    /// @notice total supply
    function totalSupply() external pure override returns (uint256) {
        return _tTotal;
    }

    /// @notice balance of
    function balanceOf(address account) public view override returns (uint256) {
        if (_isExcludedReward[account]) return _tOwned[account];
        return tokenFromReflection(_rOwned[account]); //return tokens with reflection
    }

    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        external
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "BEP20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        external
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].add(addedValue)
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        external
        virtual
        returns (bool)
    {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(
                subtractedValue,
                "BEP20: decreased allowance below zero"
            )
        );
        return true;
    }

    ///@notice total fees
    function totalFees() external view returns (uint256) {
        return _tFeeTotal;
    }

    ///@notice get amount with deduction fees or no
    function reflectionFromToken(uint256 tAmount, bool deductTransferFee)
        external
        view
        returns (uint256)
    {
        require(tAmount <= _tTotal, "Amount must be less than supply");
        if (!deductTransferFee) {
            (uint256 rAmount, , , , , ) = _getValues(tAmount);
            return rAmount;
        } else {
            (, uint256 rTransferAmount, , , , ) = _getValues(tAmount);
            return rTransferAmount;
        }
    }

    ///@notice get tokens from reflection
    function tokenFromReflection(uint256 rAmount)
        public
        view
        returns (uint256)
    {
        require(
            rAmount <= _rTotal,
            "Amount must be less than total reflections"
        );
        uint256 currentRate = _getRate();
        return rAmount.div(currentRate);
    }

    function excludeFromReward(address account) external onlyOwner {
        require(!_isExcludedReward[account], "Account is already excluded");
        if (_rOwned[account] > 0) {
            _tOwned[account] = tokenFromReflection(_rOwned[account]);
        }
        _isExcludedReward[account] = true;
        _excluded.push(account);
    }

    function includeInReward(address account) external onlyOwner {
        require(_isExcludedReward[account], "Account is already included");
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (_excluded[i] == account) {
                _excluded[i] = _excluded[_excluded.length - 1];
                _tOwned[account] = 0;
                _isExcludedReward[account] = false;
                _excluded.pop();
                break;
            }
        }
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private {
        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);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        require(from != address(0), "BEP20: transfer from the zero address");
        require(to != address(0), "BEP20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        require(!_isSniper[to], "Stop sniping!");
        require(!_isSniper[from], "Stop sniping!");
        require(!_isSniper[_msgSender()], "Stop sniping!");
        require(
            _transferOpen || from == owner(),
            "transferring tokens is not currently allowed"
        );

        bool takeFee = true;

        bool isBuying;
        bool isSelling;

        // buy
        if (
            (from == uniswapPair || _isUniswapPair[from]) &&
            to != address(uniswapRouter) &&
            _tradingOpen
        ) {
            isBuying = true;

            // normal buy, check for snipers
            if (!isExcludedFromFee(to)) {
                require(_tradingOpen, "Trading not yet enabled.");

                // antibot
                if (block.timestamp == launchTime) {
                    _isSniper[to] = true;
                    _confirmedSnipers.push(to);
                }
            }

            if (!_takeFeeOnBuyEnabled) {
                takeFee = false;
            }
        }

        // sell or transfer
        if (
            _tradingOpen &&
            from != uniswapPair &&
            !_isUniswapPair[from] &&
            from != address(uniswapRouter)
        ) {
            //if sell check max amount
            if (
                to == uniswapPair ||
                _isUniswapPair[to] ||
                to == address(uniswapRouter)
            ) {
                isSelling = true;

                if (!_takeFeeOnSellEnabled) {
                    takeFee = false;
                }

                (uint256 reserve0, uint256 reserve1, ) = IUniswapV2Pair(
                    uniswapPair
                ).getReserves();

                (reserve0, reserve1) = IUniswapV2Pair(uniswapPair)
                    .token0() == address(this)
                    ? (reserve0, reserve1)
                    : (reserve1, reserve0);

                uint256 estimatedEquivalentETH = uniswapRouter.getAmountOut(
                    amount,
                    reserve0,
                    reserve1
                );

                require(
                    estimatedEquivalentETH <= maxSellAmount,
                    "the amount of the sale is more than the available one"
                );
            }
        }

        if (!isSelling && !isBuying && !_takeFeeOnTransferEnabled) {
            takeFee = false;
        }

        if ((isExcludedFromFee(from) || isExcludedFromFee(to))) {
            takeFee = false;
        }

        _tokenTransfer(from, to, amount, takeFee);
    }

    function distribute() external isAuthorized {
        uint256 _contractTokenBalance = balanceOf(address(this));

        if (_contractTokenBalance > 0) {
            uint256 maxSwapAmount = balanceOf(uniswapPair)
                .mul(feeRate)
                .mul(PRECISION)
                .div(100)
                .div(PRECISION);

            if (_contractTokenBalance > maxSwapAmount) {
                _contractTokenBalance = maxSwapAmount;
            }
            _distribute(_contractTokenBalance);
        }
    }

    function _distribute(uint256 _contractTokenBalance) private {
        uint256 ETHBalanceBefore = address(this).balance;

        uint256 _liquidityFeeTotal = _liquidityFeeAggregate(); //get fees without reflection fee

        uint256 liquidityFeeBalance = _contractTokenBalance
            .mul(liquidityFee)
            .div(_liquidityFeeTotal);

        _contractTokenBalance = _contractTokenBalance - liquidityFeeBalance;

        _distributeForETH(_contractTokenBalance);

        uint256 ETHBalanceAfter = address(this).balance;
        uint256 ETHBalanceUpdate = ETHBalanceAfter.sub(ETHBalanceBefore);

        // send ETH to treasury address
        uint256 treasuryETHBalance = ETHBalanceUpdate;

        if (treasuryETHBalance > 0) {
            _deliverFunds(
                treasuryWallet,
                treasuryETHBalance,
                "Cant send ETH to wallet"
            );
        }

        if (liquidityFeeBalance > 0) {
            _liquifyTokens(liquidityFeeBalance);
        }
    }

    function _liquifyTokens(uint256 amount) private {
        // split the contract balance into halves
        uint256 half = amount.div(2);
        uint256 otherHalf = amount.sub(half);

        if (otherHalf > balanceOf(address(this))) {
            otherHalf = balanceOf(address(this));
        }

        uint256 initialBalance = address(this).balance;

        _distributeForETH(half);

        uint256 newBalance = address(this).balance.sub(initialBalance);

        _addLiquidity(otherHalf, newBalance);
    }

    function _addLiquidity(uint256 _tokenAmount, uint256 _ETHAmount) internal {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapRouter), _tokenAmount);

        (bool success, ) = payable(address(uniswapRouter)).call{
            value: _ETHAmount
        }(
            abi.encodeWithSignature(
                "addLiquidityETH(address,uint256,uint256,uint256,address,uint256)",
                address(this),
                _tokenAmount,
                0, // slippage is unavoidable
                0, // slippage is unavoidable,
                buybackReceiver,
                block.timestamp
            )
        );

        if (success) {
            emit SwapAndLiquify(_ETHAmount, _tokenAmount);
        }
    }

    function _distributeForETH(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> wETH
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapRouter.WETH();

        _approve(address(this), address(uniswapRouter), tokenAmount);

        (bool success, ) = payable(address(uniswapRouter)).call(
            abi.encodeWithSignature(
                "swapExactTokensForETHSupportingFeeOnTransferTokens(uint256,uint256,address[],address,uint256)",
                tokenAmount,
                0, // accept any amount of ETH
                path,
                address(this), // the contract
                block.timestamp
            )
        );
        if (success) {
            emit SwapTokensForETH(tokenAmount, path);
        }
    }

    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 amount,
        bool takeFee
    ) private {
        if (!takeFee) {
            _removeAllFee();
        }

        if (_isExcludedReward[sender] && !_isExcludedReward[recipient]) {
            _transferFromExcluded(sender, recipient, amount);
        } else if (!_isExcludedReward[sender] && _isExcludedReward[recipient]) {
            _transferToExcluded(sender, recipient, amount);
        } else if (_isExcludedReward[sender] && _isExcludedReward[recipient]) {
            _transferBothExcluded(sender, recipient, amount);
        } else {
            _transferStandard(sender, recipient, amount);
        }

        if (!takeFee) _restoreAllFee();
    }

    function _transferStandard(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rFee,
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tLiquidity
        ) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferToExcluded(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rFee,
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tLiquidity
        ) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferFromExcluded(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rFee,
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tLiquidity
        ) = _getValues(tAmount);

        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _transferBothExcluded(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        (
            uint256 rAmount,
            uint256 rTransferAmount,
            uint256 rFee,
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tLiquidity
        ) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeLiquidity(tLiquidity);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function _getValues(uint256 tAmount)
        private
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        )
    {
        (
            uint256 tTransferAmount,
            uint256 tFee,
            uint256 tLiquidity
        ) = _getTValues(tAmount);
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(
            tAmount,
            tFee,
            tLiquidity,
            _getRate()
        );
        return (
            rAmount,
            rTransferAmount,
            rFee,
            tTransferAmount,
            tFee,
            tLiquidity
        );
    }

    function _getTValues(uint256 tAmount)
        private
        view
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 tFee = _calculateReflectFee(tAmount);
        uint256 tLiquidity = _calculateLiquidityFee(tAmount);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);
        return (tTransferAmount, tFee, tLiquidity);
    }

    function _getRValues(
        uint256 tAmount,
        uint256 tFee,
        uint256 tLiquidity,
        uint256 currentRate
    )
        private
        pure
        returns (
            uint256,
            uint256,
            uint256
        )
    {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns (uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns (uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        for (uint256 i = 0; i < _excluded.length; i++) {
            if (
                _rOwned[_excluded[i]] > rSupply ||
                _tOwned[_excluded[i]] > tSupply
            ) return (_rTotal, _tTotal);
            rSupply = rSupply.sub(_rOwned[_excluded[i]]);
            tSupply = tSupply.sub(_tOwned[_excluded[i]]);
        }
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

    function _takeLiquidity(uint256 tLiquidity) private {
        uint256 currentRate = _getRate();
        uint256 rLiquidity = tLiquidity.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);
        if (_isExcludedReward[address(this)])
            _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);
    }

    function _calculateReflectFee(uint256 _amount)
        private
        view
        returns (uint256)
    {
        return
            _amount.mul(reflectionFee).mul(PRECISION).div(100).div(PRECISION);
    }

    function _liquidityFeeAggregate() private view returns (uint256) {
        return treasuryFee.add(liquidityFee);
    }

    function _calculateLiquidityFee(uint256 _amount)
        private
        view
        returns (uint256)
    {
        return
            _amount.mul(_liquidityFeeAggregate()).mul(PRECISION).div(100).div(
                PRECISION
            );
    }

    function _removeAllFee() private {
        if (reflectionFee == 0 && treasuryFee == 0 && liquidityFee == 0) return;

        _previousReflectFee = reflectionFee;
        _previousTreasuryFee = treasuryFee;
        _previousLiquidityFee = liquidityFee;

        reflectionFee = 0;
        treasuryFee = 0;
        liquidityFee = 0;
    }

    function _restoreAllFee() private {
        reflectionFee = _previousReflectFee;
        treasuryFee = _previousTreasuryFee;
        liquidityFee = _previousLiquidityFee;
    }

    function getSellSlippage(address seller) external view returns (uint256) {
        uint256 feeAgg = treasuryFee.add(reflectionFee).add(liquidityFee);

        return isExcludedFromFee(seller) ? 0 : feeAgg;
    }

    function isuniswapPair(address _pair) external view returns (bool) {
        if (_pair == uniswapPair) return true;
        return _isUniswapPair[_pair];
    }

    function takeFeeOnTransferEnabled() external view returns (bool) {
        return _takeFeeOnTransferEnabled;
    }

    function takeFeeOnBuyEnabled() external view returns (bool) {
        return _takeFeeOnBuyEnabled;
    }

    function takeFeeOnSellEnabled() external view returns (bool) {
        return _takeFeeOnSellEnabled;
    }

    function isExcludedFromFee(address account) public view returns (bool) {
        return _isExcludedFee[account];
    }

    function isExcludedFromReward(address account)
        external
        view
        returns (bool)
    {
        return _isExcludedReward[account];
    }

    function excludeFromFee(address account) external onlyOwner {
        _isExcludedFee[account] = true;
    }

    function includeInFee(address account) external onlyOwner {
        _isExcludedFee[account] = false;
    }

    function setReflectionFeePercent(uint256 _newFee) external onlyOwner {
        require(_newFee <= 100, "fee cannot exceed 100%");
        reflectionFee = _newFee;
    }

    function setTreasuryFeePercent(uint256 _newFee) external onlyOwner {
        require(_newFee <= 100, "fee cannot exceed 100%");
        treasuryFee = _newFee;
    }

    function setLiquidityFeePercent(uint256 _newFee) external onlyOwner {
        require(_newFee <= 100, "fee cannot exceed 100%");
        liquidityFee = _newFee;
    }

    function setTreasuryAddress(address _treasuryWallet) external onlyOwner {
        treasuryWallet = payable(_treasuryWallet);
    }

    function setTakeFeeOnBuyEnabled(bool _enabled) external onlyOwner {
        _takeFeeOnBuyEnabled = _enabled;
    }

    function setTakeFeeOnSellEnabled(bool _enabled) external onlyOwner {
        _takeFeeOnSellEnabled = _enabled;
    }

    function setTakeFeeOnTransferEnabled(bool _enabled) external onlyOwner {
        _takeFeeOnTransferEnabled = _enabled;
    }

    function setMaxSellAmount(uint256 _maxSellAmount) external onlyOwner {
        maxSellAmount = _maxSellAmount;
    }

    function setuniswapRouter(address _uniswapRouterAddress)
        external
        onlyOwner
    {
        uniswapRouter = IUniswapV2Router02(_uniswapRouterAddress);
    }

    function setBuybackReceiver(address _receiver) external onlyOwner {
        buybackReceiver = _receiver;
    }

    function adduniswapPair(address _pair) external onlyOwner {
        _isUniswapPair[_pair] = true;
    }

    function removeuniswapPair(address _pair) external onlyOwner {
        _isUniswapPair[_pair] = false;
    }

    function setCanTransfer(bool _canTransfer) external onlyOwner {
        _transferOpen = _canTransfer;
    }

    function isRemovedSniper(address account) external view returns (bool) {
        return _isSniper[account];
    }

    function removeSniper(address account) external onlyOwner {
        require(
            account != address(uniswapRouter),
            "We can not blacklist Uniswap"
        );
        require(!_isSniper[account], "Account is already blacklisted");
        _isSniper[account] = true;
        _confirmedSnipers.push(account);
    }

    function amnestySniper(address account) external onlyOwner {
        require(_isSniper[account], "Account is not blacklisted");
        for (uint256 i = 0; i < _confirmedSnipers.length; i++) {
            if (_confirmedSnipers[i] == account) {
                _confirmedSnipers[i] = _confirmedSnipers[
                    _confirmedSnipers.length - 1
                ];
                _isSniper[account] = false;
                _confirmedSnipers.pop();
                break;
            }
        }
    }

    function setFeeRate(uint256 _rate) external onlyOwner {
        feeRate = _rate;
    }

    // to recieve ETH from uniswapRouter when swaping
    receive() external payable {}

    /// @notice management function
    function withdrawToken(address _token, address _recipient)
        external
        virtual
        onlyOwner
    {
        uint256 amount = IERC20(_token).balanceOf(address(this));

        _withdrawToken(_token, _recipient, amount);
        _afterWithdrawToken(_token, _recipient, amount);
    }

    /// @notice management function
    function withdrawSomeToken(
        address _token,
        address _recipient,
        uint256 _amount
    ) public virtual onlyOwner {
        _withdrawToken(_token, _recipient, _amount);
        _afterWithdrawToken(_token, _recipient, _amount);
    }

    ///@notice withdraw all ETH.
    function withdraw() external virtual onlyOwner {
        _withdraw(_msgSender(), address(this).balance);
    }

    ///@notice withdraw some ETH
    function withdrawSome(address _recipient, uint256 _amount)
        external
        virtual
        onlyOwner
    {
        _withdraw(_recipient, _amount);
    }
}