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/**
 *Submitted for verification at basescan.org on 2024-06-25
*/

pragma solidity =0.8.23 >=0.5.0 >=0.6.2 ^0.8.0 ^0.8.1;

// lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol

// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol

// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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/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);
}

// lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Permit.sol

// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// lib/openzeppelin-contracts/contracts/utils/Address.sol

// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// lib/openzeppelin-contracts/contracts/utils/Context.sol

// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// lib/v2-core/contracts/interfaces/IUniswapV2Factory.sol

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// lib/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol

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

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

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

// src/ERC20/Constants.sol

library Constants {
    uint256 public constant LIQUIDITY_ADD_THRESHOLD = 5 ether;
    uint256 public constant INITIAL_VIRTUAL_TOKEN_RESERVE = 450_660_000_000 ether; // 450.66B
    uint256 public constant INITIAL_VIRTUAL_NATIVE_RESERVE = 1.5 ether; // 1.5 ether
    uint256 public constant VIRTUAL_TOKEN_RESERVE_WHEN_ADD_LIQUIDITY = 117_550_000_000 ether;    // 117.55 B
    uint256 public constant TOTAL_TOKEN_FOR_SELL = INITIAL_VIRTUAL_TOKEN_RESERVE - VIRTUAL_TOKEN_RESERVE_WHEN_ADD_LIQUIDITY;    // 117.55 B
    uint256 public constant KXY = INITIAL_VIRTUAL_TOKEN_RESERVE * INITIAL_VIRTUAL_NATIVE_RESERVE;
    uint256 public constant KXYM = KXY * M;
    uint256 public constant M = 1e18;
}

// src/ERC20/ICurve.sol

interface ICurve {
    function getOutputTokenAmount(uint256 inputAmount, address token) external view returns (uint256, uint256, uint256 remainNativeAmount);
    function getOutputEthAmount(uint256 inputAmount, address token) external view returns (uint256, uint256);
    function getInputEthAmount(uint256 outputAmount, address token) external view returns (uint256 ethInputAmount, uint256 tax);
    function getInputTokenAmount(uint256 outputNtAmount, address token) external view returns (uint256 inputAmount, uint256 tax);
}

// src/ERC20/ITokenFactory.sol

interface ITokenFactory {
    function updateRef(address referrer, address referee) external;
    function getReferrer(address referee) external view returns (address);
    function treasury() external view returns (address);
    function getRefAmounts(uint256 amount) external view returns (uint256[] memory);
    function addRefReceivedAmount(address referrer, uint256 addedAmount) external;
    function emitTokenEvent(uint8 eventType, bytes memory eventData) external;
}

// lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Metadata.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

// lib/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol

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

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

// lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol

// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the 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
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-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 virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-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 virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * 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 virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This 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) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

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

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol

// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.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;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    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");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// lib/openzeppelin-contracts/contracts/token/ERC20/extensions/ERC20Capped.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/ERC20Capped.sol)

/**
 * @dev Extension of {ERC20} that adds a cap to the supply of tokens.
 */
abstract contract ERC20Capped is ERC20 {
    uint256 private immutable _cap;

    /**
     * @dev Sets the value of the `cap`. This value is immutable, it can only be
     * set once during construction.
     */
    constructor(uint256 cap_) {
        require(cap_ > 0, "ERC20Capped: cap is 0");
        _cap = cap_;
    }

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view virtual returns (uint256) {
        return _cap;
    }

    /**
     * @dev See {ERC20-_mint}.
     */
    function _mint(address account, uint256 amount) internal virtual override {
        require(ERC20.totalSupply() + amount <= cap(), "ERC20Capped: cap exceeded");
        super._mint(account, amount);
    }
}

// src/ERC20/BaseERC20.sol

/// @title BaseERC20
/// @notice A standard ERC20 token
contract BaseERC20 is ERC20Capped, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using Address for address payable;

    IUniswapV2Router02 public immutable univ2router;
    address public immutable pair;
    IERC20 public immutable wnt;

    uint256 public immutable tokenSellThreshold;
    uint256 public constant SELL_DEX_TAX = 25; // 0.25%
    uint256 public constant PRECISION = 10000;

    uint8 public constant EVENT_TYPE_BUY = 0;
    uint8 public constant EVENT_TYPE_SELL = 1;
    uint8 public constant EVENT_TYPE_ADD_LIQUIDITY = 2;

    bool public isLiquidityPoolCreated = false;
    bool public isSwapping;
    ITokenFactory public immutable tokenFactory;
    ICurve public immutable curve;
    uint256[2] public virtualReserves;
    // modifiers
    modifier whenLiquidityNotAdded() {
        if (isLiquidityPoolCreated) {
            revert ErrLiquidityAlreadyAdded();
        }
        _;
    }

    constructor(
        IERC20 _wnt,
        IUniswapV2Router02 _univ2router,
        string memory name_,
        string memory symbol_,
        uint256 _totalSupply,
        IUniswapV2Factory univ2factory,
        ICurve _curve
    ) ERC20(name_, symbol_) ERC20Capped(_totalSupply) {
        _mint(
            address(this), // token contract
            _totalSupply // maxSupply
        );

        pair = univ2factory.createPair(address(this), address(_wnt));
        univ2router = _univ2router;
        wnt = _wnt;
        isSwapping = false;
        _approve(address(this), address(_univ2router), type(uint256).max);
        tokenSellThreshold = _totalSupply / 20000; // 0.005%
        tokenFactory = ITokenFactory(msg.sender);
        curve = _curve;
        virtualReserves[0] = Constants.INITIAL_VIRTUAL_NATIVE_RESERVE;
        virtualReserves[1] = Constants.INITIAL_VIRTUAL_TOKEN_RESERVE;
    }

    function deposit() external payable {}

    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal override {
        uint256 fee = 0;

        if (!isLiquidityPoolCreated) {
            if (!(to == address(this) || from == address(this))) {
                revert ErrLiquidityNotAdded();
            }
        }
        // check buy or sell
        if (to == pair || from == pair) {
            if (!(to == address(this) || from == address(this))) {
                fee = ((value * SELL_DEX_TAX) / PRECISION);
                if (from != pair) {
                    handle_fees();
                }
            }
        } else if ((to != address(this) && from != address(this))) {
            if (!isLiquidityPoolCreated) {
                revert ErrLiquidityNotAdded();
            }
        } 
        super._transfer(from, to, value - fee);
        if (fee > 0) {
            super._transfer(from, address(this), fee);
        }
    }

    function handle_fees() private {
        uint256 contractBalance = balanceOf(address(this));
        if (contractBalance >= tokenSellThreshold) {
            swapTokensForETH(contractBalance);
        }
    }

    function swapTokensForETH(uint256 tokenAmount) private {
        if (isSwapping || !isLiquidityPoolCreated) return;
        isSwapping = true;
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = address(wnt);
        univ2router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            tokenFactory.treasury(),
            block.timestamp
        );
        isSwapping = false;
    }

    function getBuyTokenAmount(uint256 amount) public view returns (uint256 tokenAmountReceived, uint256 tax, uint256 remainNativeAmount) {
        return curve.getOutputTokenAmount(amount, address(this));
    }

    function getNativeInputAmount(uint256 outTokenAmount) public view returns (uint256 ethInputAmount, uint256 tax) {
        return curve.getInputEthAmount(outTokenAmount, address(this));
    }

    function getSellTokenAmount(
        uint256 amount
    ) public view returns (uint256 ethReceived, uint256 tax) {
        return curve.getOutputEthAmount(amount, address(this));
    }

    function getInputTokenAmount(uint256 outputNtAmount) public view returns (uint256 inputAmount, uint256 tax) {
        return curve.getInputTokenAmount(outputNtAmount, address(this));
    }

    // return sent amount
    function transferToRef(address ref, uint256 amount) internal returns (uint256) {
        if (ref == address(0)) {
            return 0;
        }
        payable(ref).sendValue(amount);
        tokenFactory.addRefReceivedAmount(ref, amount);
        return amount;
    }

    function assertReserves(uint256 newNtReserve, uint256 newTokenReserve) internal {
        if (newNtReserve * newTokenReserve < virtualReserves[0] * virtualReserves[1]) {
            revert ErrInvalidCurve();
        }

        virtualReserves[0] = newNtReserve;
        virtualReserves[1] = newTokenReserve;
    }

    function getOrUpdateReferrer(address referrer) internal returns (address, address, address) {
        address treasury = tokenFactory.treasury();
        // check if should update referrer
        address currentReferrer = tokenFactory.getReferrer(msg.sender);
        if (currentReferrer == address(0)) {
            if (referrer == address(0)) {
                // update referrrer as treasury
                tokenFactory.updateRef(treasury, msg.sender);
                currentReferrer = treasury;
            } else {
                tokenFactory.updateRef(referrer, msg.sender);
                currentReferrer = referrer;
            }
        }
        if (currentReferrer == treasury) {
            return (currentReferrer, address(0), address(0));
        }
        address ref1Downline = tokenFactory.getReferrer(currentReferrer);
        address ref2Downline = tokenFactory.getReferrer(ref1Downline);
        return (currentReferrer, ref1Downline, ref2Downline);
    }

    function getRefAndTransfer(address referrer, uint256 tax) internal {
        uint256[] memory refAmounts = tokenFactory.getRefAmounts(tax);
        // check if should update referrer
        (address currentReferrer, address ref1Downline, address ref2Downline) = getOrUpdateReferrer(referrer);
        uint256 remainAmount = tax;
        remainAmount -= transferToRef(currentReferrer, refAmounts[0]);
        remainAmount -= transferToRef(ref1Downline, refAmounts[1]);
        remainAmount -= transferToRef(ref2Downline, refAmounts[2]);
        payable(tokenFactory.treasury()).sendValue(remainAmount);
    }

    function getVirtualReserves() public view returns (uint256[2] memory) {
        return virtualReserves;
    }

    function getReserves() external view returns (uint256[2] memory) {
        uint256[2] memory reserves;
        reserves[1] = balanceOf(address(this));
        reserves[0] = address(this).balance;
        return reserves;
    }

    // ============================================================================================
    // External Functions
    // ============================================================================================

    function buy(address recipient, address referrer, uint256 minOut) public payable whenLiquidityNotAdded nonReentrant() {
        if (recipient == address(0)) {
            recipient = msg.sender;
        }
        if (referrer == msg.sender) {
            revert ErrCannotRefToYourself();
        }
        if (msg.value == 0) {
            revert ErrValueMustBeGreaterThanZero();
        }

        (uint256 amountReceived, uint256 tax, uint256 remainNativeAmount) = getBuyTokenAmount(msg.value);
        if (amountReceived < minOut) {
            revert ErrExceedsSlipage();
        }
        _transfer(address(this), recipient, amountReceived);
        if (remainNativeAmount > 0) {
            payable(msg.sender).sendValue(remainNativeAmount);
        }
        getRefAndTransfer(referrer, tax);
        assertReserves(virtualReserves[0] + msg.value - tax - remainNativeAmount, virtualReserves[1] - amountReceived);
        tokenFactory.emitTokenEvent(EVENT_TYPE_BUY, abi.encode(address(this), msg.sender, recipient, msg.value, msg.value - tax - remainNativeAmount, amountReceived, virtualReserves[0], virtualReserves[1]));
        callAddLiquidityIfShould();
    }

    function buyExactOut(address recipient, address referrer, uint256 outTokenAmount) external payable whenLiquidityNotAdded nonReentrant() {
        if (recipient == address(0)) {
            recipient = msg.sender;
        }
        if (referrer == msg.sender) {
            revert ErrCannotRefToYourself();
        }
        if (msg.value == 0) {
            revert ErrValueMustBeGreaterThanZero();
        }

        (uint256 ethInputAmount, uint256 tax) = getNativeInputAmount(outTokenAmount);
        if (ethInputAmount > msg.value) {
            revert ErrExceedsSlipage();
        }
        _transfer(address(this), recipient, outTokenAmount);

        getRefAndTransfer(referrer, tax);
        if (msg.value > ethInputAmount) {
            payable(msg.sender).sendValue(msg.value - ethInputAmount);
        }

        assertReserves(virtualReserves[0] + ethInputAmount - tax, virtualReserves[1] - outTokenAmount);
        tokenFactory.emitTokenEvent(EVENT_TYPE_BUY, abi.encode(address(this), msg.sender, recipient, ethInputAmount, ethInputAmount - tax, outTokenAmount,  virtualReserves[0], virtualReserves[1]));
        callAddLiquidityIfShould();
    }

    function sell(address recipient, uint256 tokenAmount, address referrer, uint256 minOut) external whenLiquidityNotAdded nonReentrant {
        if (recipient == address(0)) {
            recipient = msg.sender;
        }
        if (referrer == msg.sender) {
            revert ErrCannotRefToYourself();
        }
        if (tokenAmount == 0) {
            revert ErrValueMustBeGreaterThanZero();
        }
        (uint256 amountUserReceived, uint256 tax) = getSellTokenAmount(tokenAmount);

        _transfer(msg.sender, address(this), tokenAmount);

        if (amountUserReceived < minOut) {
            revert ErrExceedsSlipage();
        }
        payable(recipient).sendValue(amountUserReceived);
        getRefAndTransfer(referrer, tax);
        assertReserves(virtualReserves[0] - (amountUserReceived + tax), virtualReserves[1] + tokenAmount);
        tokenFactory.emitTokenEvent(EVENT_TYPE_SELL, abi.encode(address(this), msg.sender, recipient, tokenAmount, amountUserReceived + tax, amountUserReceived,  virtualReserves[0], virtualReserves[1]));
        callAddLiquidityIfShould();
    }
    
    function sellExactOut(address recipient, uint256 outputNtAmount, address referrer, uint256 maxTokenAmount) external whenLiquidityNotAdded nonReentrant {
        if (recipient == address(0)) {
            recipient = msg.sender;
        }
        if (referrer == msg.sender) {
            revert ErrCannotRefToYourself();
        }
        if (maxTokenAmount == 0 || outputNtAmount == 0) {
            revert ErrValueMustBeGreaterThanZero();
        }
        (uint256 inputTokenAmount, uint256 tax) = getInputTokenAmount(outputNtAmount);

        if (inputTokenAmount > maxTokenAmount) {
            revert ErrExceedsSlipage();
        }

        _transfer(msg.sender, address(this), inputTokenAmount);
        payable(recipient).sendValue(outputNtAmount);

        getRefAndTransfer(referrer, tax);
        assertReserves(virtualReserves[0] - (outputNtAmount + tax), virtualReserves[1] + inputTokenAmount);
        tokenFactory.emitTokenEvent(EVENT_TYPE_SELL, abi.encode(address(this), msg.sender, recipient, inputTokenAmount, outputNtAmount + tax, outputNtAmount,  virtualReserves[0], virtualReserves[1]));
        callAddLiquidityIfShould();
    }

    function callAddLiquidityIfShould() internal {
        if (virtualReserves[1] == Constants.VIRTUAL_TOKEN_RESERVE_WHEN_ADD_LIQUIDITY) {
            addLiquidity();
        }
    }

    function addLiquidity() public whenLiquidityNotAdded {
        if (virtualReserves[1] != Constants.VIRTUAL_TOKEN_RESERVE_WHEN_ADD_LIQUIDITY) {
            revert ErrLiquidityBelowThreshold();
        }

        uint256 tokenAmountToAdd = totalSupply() - Constants.TOTAL_TOKEN_FOR_SELL;
        if (tokenAmountToAdd > balanceOf(address(this))) {
            tokenAmountToAdd = balanceOf(address(this));
        }

        // fee when add liquidity
        payable(tokenFactory.treasury()).sendValue(0.05 ether);

        payable(address(wnt)).functionCallWithValue(
            abi.encodeWithSignature("deposit()"),
            address(this).balance
        );

        uint256 _amountToken = tokenAmountToAdd;
        uint256 _amountWNT = wnt.balanceOf(address(this));
        if (!(_amountToken > 0 && _amountWNT > 0)) {
            revert ErrInvalidLiquidityAmount();
        }

        wnt.forceApprove(address(univ2router), _amountWNT);
        uint256 _liquidity = 0;
        (_amountToken, _amountWNT, _liquidity) = univ2router.addLiquidity(
            address(this), // tokenA
            address(wnt), // tokenB
            _amountToken, // amountADesired
            _amountWNT, // amountBDesired
            _amountToken, // amountAMin
            _amountWNT, // amountBMin
            address(0), // to
            block.timestamp // deadline
        );
        isLiquidityPoolCreated = true;
        // burn the rest
        _burn(address(this), balanceOf(address(this)));
        tokenFactory.emitTokenEvent(EVENT_TYPE_ADD_LIQUIDITY, abi.encode(address(this), _amountToken, _amountWNT, pair));
    }

    receive() external payable {
        buy(msg.sender, address(0), 0);
    }

    error ErrMinimumInitialDeposit();
    error ErrLiquidityAlreadyAdded();
    error ErrLiquidityReadyToAdd();
    error ErrLiquidityNotAdded();
    error ErrLiquidityBelowThreshold();
    error ErrValueMustBeGreaterThanZero();
    error ErrInvalidLiquidityAmount();
    error ErrCannotRefToYourself();
    error ErrExceedsSlipage();
    error ErrInvalidCurve();
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "@vectorized/=lib/dn404/src/",
    "@uniswap-periphery/=lib/v2-periphery/contracts/",
    "@uniswap-core/=lib/v2-core/contracts/",
    "dn404/=lib/dn404/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "murky/=lib/dn404/lib/murky/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "solady/=lib/dn404/lib/solady/src/",
    "v2-core/=lib/v2-core/contracts/",
    "v2-periphery/=lib/v2-periphery/contracts/",
    "v3-core/=lib/v3-core/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IERC20","name":"_wnt","type":"address"},{"internalType":"contract IUniswapV2Router02","name":"_univ2router","type":"address"},{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"uint256","name":"_totalSupply","type":"uint256"},{"internalType":"contract IUniswapV2Factory","name":"univ2factory","type":"address"},{"internalType":"contract ICurve","name":"_curve","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ErrCannotRefToYourself","type":"error"},{"inputs":[],"name":"ErrExceedsSlipage","type":"error"},{"inputs":[],"name":"ErrInvalidCurve","type":"error"},{"inputs":[],"name":"ErrInvalidLiquidityAmount","type":"error"},{"inputs":[],"name":"ErrLiquidityAlreadyAdded","type":"error"},{"inputs":[],"name":"ErrLiquidityBelowThreshold","type":"error"},{"inputs":[],"name":"ErrLiquidityNotAdded","type":"error"},{"inputs":[],"name":"ErrLiquidityReadyToAdd","type":"error"},{"inputs":[],"name":"ErrMinimumInitialDeposit","type":"error"},{"inputs":[],"name":"ErrValueMustBeGreaterThanZero","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"EVENT_TYPE_ADD_LIQUIDITY","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EVENT_TYPE_BUY","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EVENT_TYPE_SELL","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SELL_DEX_TAX","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"addLiquidity","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"uint256","name":"minOut","type":"uint256"}],"name":"buy","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"uint256","name":"outTokenAmount","type":"uint256"}],"name":"buyExactOut","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"cap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"curve","outputs":[{"internalType":"contract ICurve","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getBuyTokenAmount","outputs":[{"internalType":"uint256","name":"tokenAmountReceived","type":"uint256"},{"internalType":"uint256","name":"tax","type":"uint256"},{"internalType":"uint256","name":"remainNativeAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"outputNtAmount","type":"uint256"}],"name":"getInputTokenAmount","outputs":[{"internalType":"uint256","name":"inputAmount","type":"uint256"},{"internalType":"uint256","name":"tax","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"outTokenAmount","type":"uint256"}],"name":"getNativeInputAmount","outputs":[{"internalType":"uint256","name":"ethInputAmount","type":"uint256"},{"internalType":"uint256","name":"tax","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getReserves","outputs":[{"internalType":"uint256[2]","name":"","type":"uint256[2]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getSellTokenAmount","outputs":[{"internalType":"uint256","name":"ethReceived","type":"uint256"},{"internalType":"uint256","name":"tax","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVirtualReserves","outputs":[{"internalType":"uint256[2]","name":"","type":"uint256[2]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isLiquidityPoolCreated","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isSwapping","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pair","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"tokenAmount","type":"uint256"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"uint256","name":"minOut","type":"uint256"}],"name":"sell","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"outputNtAmount","type":"uint256"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"uint256","name":"maxTokenAmount","type":"uint256"}],"name":"sellExactOut","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenFactory","outputs":[{"internalType":"contract ITokenFactory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenSellThreshold","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"univ2router","outputs":[{"internalType":"contract IUniswapV2Router02","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"virtualReserves","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wnt","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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

-----Decoded View---------------
Arg [0] : _wnt (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [1] : _univ2router (address): 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
Arg [2] : name_ (string): $CULO
Arg [3] : symbol_ (string): CULO
Arg [4] : _totalSupply (uint256): 420000000000000000000000000000
Arg [5] : univ2factory (address): 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f
Arg [6] : _curve (address): 0x1429B38e58b97de646ACd65fdb8a4502c2131484

-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [1] : 0000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488d
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [4] : 00000000000000000000000000000000000000054d17db76321263eca0000000
Arg [5] : 0000000000000000000000005c69bee701ef814a2b6a3edd4b1652cb9cc5aa6f
Arg [6] : 0000000000000000000000001429b38e58b97de646acd65fdb8a4502c2131484
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [8] : 2443554c4f000000000000000000000000000000000000000000000000000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [10] : 43554c4f00000000000000000000000000000000000000000000000000000000