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// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../dependencies/uniswap/libraries/UniswapV2Library.sol";
import "../access/Governable.sol";
import "../interfaces/swapper/IExchange.sol";

/**
 * @notice UniswapV2 Like Exchange
 */
contract UniswapV2LikeExchange is IExchange, Governable {
    using SafeERC20 for IERC20;

    /**
     * @notice The WETH-Like token (a.k.a. Native Token)
     * @dev I.e. should be the most liquid token that offer best routers among trade pairs
     * @dev It's usually the wrapper token of the chain's native coin but it isn't always true
     * For instance: On Polygon, the `WETH` is more liquid than `WMATIC` on UniV3 protocol.
     */
    address public wethLike;

    /**
     * @notice The UniswapV2-Like factory contract
     */
    address public immutable factory;

    bytes32 internal immutable initCodeHash;
    /// @notice Emitted when wethLike token is updated
    event WethLikeTokenUpdated(address oldWethLike, address newWethLike);

    /**
     * @dev Doesn't consider router.WETH() as `wethLike` because isn't guaranteed that it's the most liquid token.
     */
    constructor(
        address factory_,
        bytes32 initCodeHash_,
        address wethLike_
    ) {
        factory = factory_;
        initCodeHash = initCodeHash_;
        wethLike = wethLike_;
    }

    /// @inheritdoc IExchange
    function getAmountsIn(uint256 amountOut_, bytes memory path_) external view override returns (uint256 _amountIn) {
        _amountIn = getAmountsIn(amountOut_, _decodePath(path_));
    }

    /// @inheritdoc IExchange
    function getAmountsOut(uint256 amountIn_, bytes memory path_) external view override returns (uint256 _amountOut) {
        _amountOut = getAmountsOut(amountIn_, _decodePath(path_));
    }

    /**
     * @dev getBestAmountIn require a try/catch version of getAmountsIn and try/catch do not work with internal
     * library functions, hence wrapped library call in this function so that it can be used in try/catch
     */
    function getAmountsIn(uint256 amountOut_, address[] memory path_) public view returns (uint256 _amountIn) {
        _amountIn = UniswapV2Library.getAmountsIn(factory, initCodeHash, amountOut_, path_)[0];
    }

    /**
     * @dev getBestAmountOut require a try/catch version of getAmountsOut and try/catch do not work with internal
     * library functions, hence wrapped library call in this function so that it can be used in try/catch
     */
    function getAmountsOut(uint256 amountIn_, address[] memory path_) public view returns (uint256 _amountOut) {
        _amountOut = UniswapV2Library.getAmountsOut(factory, initCodeHash, amountIn_, path_)[path_.length - 1];
    }

    /// @inheritdoc IExchange
    function getBestAmountIn(
        address tokenIn_,
        address tokenOut_,
        uint256 amountOut_
    ) external returns (uint256 _amountIn, bytes memory _path) {
        // 1. Check IN-OUT pair
        address[] memory _pathA = new address[](2);
        _pathA[0] = tokenIn_;
        _pathA[1] = tokenOut_;
        uint256 _amountInA = _getAmountsIn(amountOut_, _pathA);

        if (tokenIn_ == wethLike || tokenOut_ == wethLike) {
            // Returns if one of the token is WETH-Like
            require(_amountInA > 0, "no-path-found");
            return (_amountInA, _encodePath(_pathA));
        }

        // 2. Check IN-WETH-OUT path
        address[] memory _pathB = new address[](3);
        _pathB[0] = tokenIn_;
        _pathB[1] = wethLike;
        _pathB[2] = tokenOut_;
        uint256 _amountInB = _getAmountsIn(amountOut_, _pathB);

        // 3. Get best route between paths A and B
        require(_amountInA > 0 || _amountInB > 0, "no-path-found");

        // Returns A if it's valid and better than B or if B isn't valid
        if ((_amountInA > 0 && _amountInA < _amountInB) || _amountInB == 0) {
            return (_amountInA, _encodePath(_pathA));
        }
        return (_amountInB, _encodePath(_pathB));
    }

    /// @inheritdoc IExchange
    function getBestAmountOut(
        address tokenIn_,
        address tokenOut_,
        uint256 amountIn_
    ) external returns (uint256 _amountOut, bytes memory _path) {
        // 1. Check IN-OUT pair
        address[] memory _pathA = new address[](2);
        _pathA[0] = tokenIn_;
        _pathA[1] = tokenOut_;
        uint256 _amountOutA = _getAmountsOut(amountIn_, _pathA);

        if (tokenIn_ == wethLike || tokenOut_ == wethLike) {
            // Returns if one of the token is WETH-Like
            require(_amountOutA > 0, "no-path-found");
            return (_amountOutA, _encodePath(_pathA));
        }

        // 2. Check IN-WETH-OUT path
        address[] memory _pathB = new address[](3);
        _pathB[0] = tokenIn_;
        _pathB[1] = wethLike;
        _pathB[2] = tokenOut_;
        uint256 _amountOutB = _getAmountsOut(amountIn_, _pathB);

        // 3. Get best route between paths A and B
        require(_amountOutA > 0 || _amountOutB > 0, "no-path-found");
        if (_amountOutA > _amountOutB) return (_amountOutA, _encodePath(_pathA));
        return (_amountOutB, _encodePath(_pathB));
    }

    /// @inheritdoc IExchange
    function swapExactInput(
        bytes calldata path_,
        uint256 amountIn_,
        uint256 amountOutMin_,
        address outReceiver_
    ) external returns (uint256 _amountOut) {
        address[] memory _path = _decodePath(path_);
        IERC20 _tokenIn = IERC20(_path[0]);
        IERC20 _tokenOut = IERC20(_path[_path.length - 1]);

        _tokenIn.safeTransfer(UniswapV2Library.pairFor(factory, initCodeHash, _path[0], _path[1]), amountIn_);
        uint256 balanceBefore = _tokenOut.balanceOf(outReceiver_);
        _swap(_path, outReceiver_);
        _amountOut = _tokenOut.balanceOf(outReceiver_) - balanceBefore;
        require(_amountOut >= amountOutMin_, "Too little received");
    }

    /// @inheritdoc IExchange
    function swapExactOutput(
        bytes calldata path_,
        uint256 amountOut_,
        uint256 amountInMax_,
        address inSender_,
        address outRecipient_
    ) external returns (uint256 _amountIn) {
        address[] memory _path = _decodePath(path_);
        IERC20 _tokenIn = IERC20(_path[0]);

        _amountIn = UniswapV2Library.getAmountsIn(factory, initCodeHash, amountOut_, _path)[0];
        require(_amountIn <= amountInMax_, "Too much requested");

        _tokenIn.safeTransfer(UniswapV2Library.pairFor(factory, initCodeHash, _path[0], _path[1]), _amountIn);
        _swap(_path, outRecipient_);

        // If swap end up costly less than _amountInMax then return remaining
        uint256 _remainingAmountIn = amountInMax_ - _amountIn;
        if (_remainingAmountIn > 0) {
            _tokenIn.safeTransfer(inSender_, _remainingAmountIn);
        }
    }

    /// @dev Returns `0` if reverts
    function _getAmountsIn(uint256 _amountOut, address[] memory _path) internal view returns (uint256 _amountIn) {
        try this.getAmountsIn(_amountOut, _path) returns (uint256 amountIn) {
            _amountIn = amountIn;
        } catch {}
    }

    /// @dev Returns `0` if reverts
    function _getAmountsOut(uint256 amountIn_, address[] memory path_) internal view returns (uint256 _amountOut) {
        try this.getAmountsOut(amountIn_, path_) returns (uint256 amountOut) {
            _amountOut = amountOut;
        } catch {}
    }

    /**
     * @notice Encode path from `address[]` to `bytes`
     */
    function _encodePath(address[] memory path_) private pure returns (bytes memory _path) {
        return abi.encode(path_);
    }

    /**
     * @notice Encode path from `bytes` to `address[]`
     */
    function _decodePath(bytes memory path_) private pure returns (address[] memory _path) {
        return abi.decode(path_, (address[]));
    }

    /**
     * NOTICE:: This function is being used as is from Uniswap's V2SwapRouter.sol deployed
     * at 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45 and licensed under GPL-2.0-or-later.
     * - It does supports fee-on-transfer tokens
     * - It does requires the initial amount to have already been sent to the first pair
     */
    function _swap(address[] memory path, address _to) private {
        for (uint256 i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0, ) = UniswapV2Library.sortTokens(input, output);
            IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, initCodeHash, input, output));
            uint256 amountInput;
            uint256 amountOutput;
            // scope to avoid stack too deep errors
            {
                (uint256 reserve0, uint256 reserve1, ) = pair.getReserves();
                (uint256 reserveInput, uint256 reserveOutput) = input == token0
                    ? (reserve0, reserve1)
                    : (reserve1, reserve0);
                amountInput = IERC20(input).balanceOf(address(pair)) - reserveInput;
                amountOutput = UniswapV2Library.getAmountOut(amountInput, reserveInput, reserveOutput);
            }
            (uint256 amount0Out, uint256 amount1Out) = input == token0
                ? (uint256(0), amountOutput)
                : (amountOutput, uint256(0));
            address to = i < path.length - 2
                ? UniswapV2Library.pairFor(factory, initCodeHash, output, path[i + 2])
                : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }

    /**
     * @notice Update WETH-Like token
     */
    function updateWethLikeToken(address wethLike_) external onlyGovernor {
        emit WethLikeTokenUpdated(wethLike, wethLike_);
        wethLike = wethLike_;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = _setInitializedVersion(1);
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        bool isTopLevelCall = _setInitializedVersion(version);
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(version);
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        _setInitializedVersion(type(uint8).max);
    }

    function _setInitializedVersion(uint8 version) private returns (bool) {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, and for the lowest level
        // of initializers, because in other contexts the contract may have been reentered.
        if (_initializing) {
            require(
                version == 1 && !Address.isContract(address(this)),
                "Initializable: contract is already initialized"
            );
            return false;
        } else {
            require(_initialized < version, "Initializable: contract is already initialized");
            _initialized = version;
            return true;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../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");
        }
    }
}

// SPDX-License-Identifier: MIT
// 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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// 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;
    }
}

pragma solidity >=0.5.0;

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;
}

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.0;

/// @title Optimized overflow and underflow safe math operations
/// @notice Contains methods for doing math operations that revert on overflow or underflow for minimal gas cost
library LowGasSafeMath {
    /// @notice Returns x + y, reverts if sum overflows uint256
    /// @param x The augend
    /// @param y The addend
    /// @return z The sum of x and y
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x);
    }

    /// @notice Returns x - y, reverts if underflows
    /// @param x The minuend
    /// @param y The subtrahend
    /// @return z The difference of x and y
    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x);
    }

    /// @notice Returns x * y, reverts if overflows
    /// @param x The multiplicand
    /// @param y The multiplier
    /// @return z The product of x and y
    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(x == 0 || (z = x * y) / x == y);
    }

    /// @notice Returns x + y, reverts if overflows or underflows
    /// @param x The augend
    /// @param y The addend
    /// @return z The sum of x and y
    function add(int256 x, int256 y) internal pure returns (int256 z) {
        require((z = x + y) >= x == (y >= 0));
    }

    /// @notice Returns x - y, reverts if overflows or underflows
    /// @param x The minuend
    /// @param y The subtrahend
    /// @return z The difference of x and y
    function sub(int256 x, int256 y) internal pure returns (int256 z) {
        require((z = x - y) <= x == (y >= 0));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "../interfaces/IGovernable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (governor) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the governor account will be the one that deploys the contract. This
 * can later be changed with {transferGovernorship}.
 *
 */
abstract contract Governable is IGovernable, Context, Initializable {
    address public governor;
    address private proposedGovernor;

    event UpdatedGovernor(address indexed previousGovernor, address indexed proposedGovernor);

    /**
     * @dev Initializes the contract setting the deployer as the initial governor.
     */
    constructor() {
        address msgSender = _msgSender();
        governor = msgSender;
        emit UpdatedGovernor(address(0), msgSender);
    }

    /**
     * @dev If inheriting child is using proxy then child contract can use
     * __Governable_init() function to initialization this contract
     */
    // solhint-disable-next-line func-name-mixedcase
    function __Governable_init() internal initializer {
        address msgSender = _msgSender();
        governor = msgSender;
        emit UpdatedGovernor(address(0), msgSender);
    }

    /**
     * @dev Throws if called by any account other than the governor.
     */
    modifier onlyGovernor() {
        require(governor == _msgSender(), "not-governor");
        _;
    }

    /**
     * @dev Transfers governorship of the contract to a new account (`proposedGovernor`).
     * Can only be called by the current owner.
     */
    function transferGovernorship(address _proposedGovernor) external onlyGovernor {
        require(_proposedGovernor != address(0), "proposed-governor-is-zero");
        proposedGovernor = _proposedGovernor;
    }

    /**
     * @dev Allows new governor to accept governorship of the contract.
     */
    function acceptGovernorship() external {
        require(proposedGovernor == _msgSender(), "not-the-proposed-governor");
        emit UpdatedGovernor(governor, proposedGovernor);
        governor = proposedGovernor;
        proposedGovernor = address(0);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';
import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
import '@uniswap/v3-core/contracts/libraries/LowGasSafeMath.sol';

/**
 * This is copied from Uniswap's V2SwapRouter.sol deployed at 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45
 * and licensed under GPL-2.0-or-later.
 * Changelog:
 * - Removed hardcoded initCodeHash and taking as param so that we can support multiple UniswapV2Like exchanges
 * - Added function getAmountsOut()
 */
library UniswapV2Library {
    using LowGasSafeMath for uint256;

    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB);
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0));
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(address factory, bytes32 initCodeHash, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint160
        (uint256(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                initCodeHash
            )))));
    }

    // fetches and sorts the reserves for a pair
    function getReserves(
        address factory,
        bytes32 initCodeHash,
        address tokenA,
        address tokenB
    ) internal view returns (uint256 reserveA, uint256 reserveB) {
        (address token0, ) = sortTokens(tokenA, tokenB);
        (uint256 reserve0, uint256 reserve1, ) = IUniswapV2Pair(pairFor(factory, initCodeHash, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }

    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountOut) {
        require(amountIn > 0, 'INSUFFICIENT_INPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0);
        uint256 amountInWithFee = amountIn.mul(997);
        uint256 numerator = amountInWithFee.mul(reserveOut);
        uint256 denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountIn) {
        require(amountOut > 0, 'INSUFFICIENT_OUTPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0);
        uint256 numerator = reserveIn.mul(amountOut).mul(1000);
        uint256 denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }

        // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(
        address factory,
        bytes32 initCodeHash,
        uint amountIn,
        address[] memory path
    ) internal view returns (uint[] memory amounts) {
        require(path.length >= 2);
        amounts = new uint[](path.length);
        amounts[0] = amountIn;
        for (uint i; i < path.length - 1; i++) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, initCodeHash, path[i], path[i + 1]);
            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }

    // performs chained getAmountIn calculations on any number of pairs
    function getAmountsIn(
        address factory,
        bytes32 initCodeHash,
        uint256 amountOut,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2);
        amounts = new uint256[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint256 i = path.length - 1; i > 0; i--) {
            (uint256 reserveIn, uint256 reserveOut) = getReserves(factory,initCodeHash, path[i - 1], path[i]);
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

/**
 * @notice Governable interface
 */
interface IGovernable {
    function governor() external view returns (address _governor);

    function transferGovernorship(address _proposedGovernor) external;
}

// SPDX-License-Identifier: MIT

pragma solidity <=0.8.9;

/**
 * @notice Exchange interface
 */
interface IExchange {
    /**
     * @notice Get *spot* quote
     * It will return the swap amount based on the current reserves of the given path (i.e. spot price)
     * @dev It shouldn't be used as oracle!!!
     */
    function getAmountsIn(uint256 _amountOut, bytes memory path_) external returns (uint256 _amountIn);

    /**
     * @notice Get *spot* quote
     * It will return the swap amount based on the current reserves of the given path (i.e. spot price)
     * @dev It shouldn't be used as oracle!!!
     */
    function getAmountsOut(uint256 amountIn_, bytes memory path_) external returns (uint256 _amountOut);

    /**
     * @notice Get *spot* quote
     * It will return the swap amount based on the current reserves of the best pair/path found (i.e. spot price)
     * @dev It shouldn't be used as oracle!!!
     */
    function getBestAmountIn(
        address tokenIn_,
        address tokenOut_,
        uint256 amountOut_
    ) external returns (uint256 _amountIn, bytes memory _path);

    /**
     * @notice Get *spot* quote
     * It will return the swap amount based on the current reserves of the best pair/path found (i.e. spot price)
     * @dev It shouldn't be used as oracle!!!
     */
    function getBestAmountOut(
        address tokenIn_,
        address tokenOut_,
        uint256 amountIn_
    ) external returns (uint256 _amountOut, bytes memory _path);

    /**
     * @notice Perform an exact input swap
     * @dev Should transfer `amountIn_` before performing swap
     */
    function swapExactInput(
        bytes calldata path_,
        uint256 amountIn_,
        uint256 amountOutMin_,
        address outReceiver_
    ) external returns (uint256 _amountOut);

    /**
     * @notice Perform an exact output swap
     * @dev Should transfer `amountInMax_` before performing swap
     * @dev Sends swap remains - if any - to the `inSender_`
     */
    function swapExactOutput(
        bytes calldata path_,
        uint256 amountOut_,
        uint256 amountInMax_,
        address inSender_,
        address outRecipient_
    ) external returns (uint256 _amountIn);
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 5000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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000000000000000000000000c0aee478e3658e2610c5f7a4a2e1777ce9e4f2ace18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : factory_ (address): 0xC0AEe478e3658e2610c5F7A4A2E1777cE9e4f2Ac
Arg [1] : initCodeHash_ (bytes32): 0xe18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303
Arg [2] : wethLike_ (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000c0aee478e3658e2610c5f7a4a2e1777ce9e4f2ac
Arg [1] : e18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303
Arg [2] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2