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// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "../interfaces/ISwapRouter.sol";
import "../interfaces/ISwitchEvent.sol";
import "../interfaces/IUniswapFactory.sol";
import "./IWETH.sol";
import "../lib/UniswapExchangeLib.sol";
import "../lib/DataTypes.sol";

contract SwapRouter is Ownable, ISwapRouter {
    using UniswapExchangeLib for IUniswapExchange;
    using UniversalERC20 for IERC20;
    using SafeERC20 for IERC20;

    ISwitchEvent public switchEvent;
    uint256 public dexCount;
    uint256 public pathCount;
    uint256 public pathSplit;
    IWETH public weth; // chain's native token
    IWETH public otherToken; //could be weth on a non-eth chain or other mid token(like busd)
    address public paraswapProxy;
    address public augustusSwapper;
    address[] public factories;

    event SwitchEventSet(address switchEvent);
    event ParaswapProxySet(address paraswapProxy);
    event AugustusSwapperSet(address augustusSwapper);
    event WETHSet(address _weth);
    event OtherTokenSet(address _otherToken);
    event PathCountSet(uint256 _pathCount);
    event PathSplitSet(uint256 _pathSplit);
    event FactoriesSet(address[] _factories);

    constructor(
        address _weth,
        address _otherToken,
        uint256 _pathCount,
        uint256 _pathSplit,
        address[] memory _factories,
        address _switchEventAddress,
        address _paraswapProxy,
        address _augustusSwapper
    ) {
        switchEvent = ISwitchEvent(_switchEventAddress);
        paraswapProxy = _paraswapProxy;
        augustusSwapper = _augustusSwapper;

        weth = IWETH(_weth);
        otherToken = IWETH(_otherToken);
        pathCount = _pathCount;
        pathSplit = _pathSplit;
        dexCount = _factories.length;

        for (uint256 i; i < dexCount; ) {
            factories.push(_factories[i]);

            unchecked {
                i++;
            }
        }
    }

    /// @inheritdoc ISwapRouter
    function swap(SwapRequest calldata swapRequest)
        external
        payable
        override
        returns (uint256 unspent, uint256 returnAmount)
    {
        uint256 prevDstBal = swapRequest.dstToken.universalBalanceOf(
            address(this)
        );

        require(swapRequest.amountIn != 0, "zero");
        swapRequest.srcToken.universalTransferFrom(
            msg.sender,
            address(this),
            swapRequest.amountIn
        );

        uint256 prevSrcBal = swapRequest.srcToken.universalBalanceOf(
            address(this)
        ) - swapRequest.amountIn;

        uint256 spentAmount;
        // If amountIn is less than minimum, we couldn't use any aggregator
        if (swapRequest.amountIn >= swapRequest.amountMinSpend) {
            require(
                !swapRequest.useParaswap ||
                    _swapOnParaswap(
                        swapRequest.srcToken,
                        swapRequest.amountIn,
                        swapRequest.paraswapData
                    ) ||
                    !swapRequest.raiseError,
                "Paraswap swap failed"
            );

            _swapExternal(
                swapRequest.srcToken,
                swapRequest.splitSwapData,
                swapRequest.raiseError
            );

            uint256 currSrcBal = swapRequest.srcToken.universalBalanceOf(
                address(this)
            );
            require(currSrcBal >= prevSrcBal, "Too much swapped");
            spentAmount = prevSrcBal + swapRequest.amountIn - currSrcBal;
        }

        if (
            swapRequest.distribution.length != 0 &&
            swapRequest.distribution.length < dexCount * pathCount &&
            swapRequest.amountIn != spentAmount
        ) {
            _swapForSingleSwap(
                swapRequest.srcToken,
                swapRequest.dstToken,
                swapRequest.amountIn - spentAmount,
                swapRequest.distribution,
                swapRequest.raiseError
            );
        }

        uint256 finalSrcBal = swapRequest.srcToken.universalBalanceOf(
            address(this)
        );
        uint256 finalDstBal = swapRequest.dstToken.universalBalanceOf(
            address(this)
        );

        unspent = finalSrcBal - prevSrcBal;
        returnAmount = finalDstBal - prevDstBal;

        if (unspent != 0) {
            swapRequest.srcToken.universalTransfer(msg.sender, unspent);
        }

        if (returnAmount != 0) {
            swapRequest.dstToken.universalTransfer(msg.sender, returnAmount);
        }

        require(returnAmount >= swapRequest.amountOutMin);
    }

    function _swapOnParaswap(
        IERC20 token,
        uint256 amount,
        bytes memory callData
    ) internal returns (bool success) {
        if (callData.length == 0) {
            return true;
        }
        uint256 value;
        if (token.isETH()) {
            value = amount;
        } else {
            token.universalApprove(paraswapProxy, amount);
        }

        (success, ) = augustusSwapper.call{value: value}(callData);
    }

    function _swapExternal(
        IERC20 srcToken,
        DataTypes.SplitSwapInfo[] memory splitSwapData,
        bool raiseError
    ) internal {
        if (splitSwapData.length != 0) {
            uint256 len = splitSwapData.length;
            for (uint256 i; i < len; ) {
                try this.swapExternal(srcToken, splitSwapData[i]) {} catch {
                    require(!raiseError, "External swap failed");
                }

                unchecked {
                    i++;
                }
            }
        }
    }

    function swapExternal(
        IERC20 srcToken,
        DataTypes.SplitSwapInfo memory splitSwapData
    ) external {
        require(
            msg.sender == address(this),
            "Msg.sender can be contract it self"
        );

        if (splitSwapData.spender == address(0) && !srcToken.isETH()) {
            // Manually transfer instead of approve
            srcToken.universalTransfer(
                splitSwapData.swapContract,
                splitSwapData.amount
            );
        } else {
            srcToken.universalApprove(
                splitSwapData.spender,
                splitSwapData.amount
            );
        }
        (bool success, ) = splitSwapData.swapContract.call{
            value: srcToken.isETH() ? splitSwapData.amount : 0
        }(splitSwapData.swapData);

        require(success, "External swap failed");
    }

    function _swapForSingleSwap(
        IERC20 srcToken,
        IERC20 dstToken,
        uint256 amount,
        uint256[] memory distribution,
        bool raiseError
    ) private returns (uint256 returnAmount, uint256 parts) {
        uint256 lastNonZeroIndex = 0;
        uint256 len = distribution.length;
        for (uint256 i; i < len; ) {
            if (distribution[i] > 0) {
                parts += distribution[i];
                lastNonZeroIndex = i;
            }

            unchecked {
                i++;
            }
        }

        require(parts > 0 || !raiseError, "invalid distribution param");

        // break function to avoid stack too deep error
        returnAmount = _swapInternalForSingleSwap(
            distribution,
            amount,
            parts,
            lastNonZeroIndex,
            srcToken,
            dstToken
        );
        require(returnAmount > 0 || !raiseError, "Swap failed from dex");

        switchEvent.emitSwapped(
            msg.sender,
            address(this),
            IERC20(srcToken),
            IERC20(dstToken),
            amount,
            returnAmount,
            0
        );
    }

    function _swapInternalForSingleSwap(
        uint256[] memory distribution,
        uint256 amount,
        uint256 parts,
        uint256 lastNonZeroIndex,
        IERC20 fromToken,
        IERC20 dstToken
    ) internal returns (uint256 totalAmount) {
        uint256 remainingAmount = amount;
        uint256 swappedAmount = 0;
        uint256 len = distribution.length;
        for (uint256 i; i < len; i++) {
            if (distribution[i] == 0) {
                continue;
            }
            uint256 swapAmount = (amount * distribution[i]) / parts;
            if (i == lastNonZeroIndex) {
                swapAmount = remainingAmount;
            }
            remainingAmount -= swapAmount;
            if (i % pathCount == 0) {
                swappedAmount = _swap(
                    fromToken,
                    dstToken,
                    swapAmount,
                    IUniswapFactory(factories[i / pathCount])
                );
            } else if (i % pathCount == 1) {
                swappedAmount = _swapETH(
                    fromToken,
                    dstToken,
                    swapAmount,
                    IUniswapFactory(factories[i / pathCount])
                );
            } else {
                swappedAmount = _swapOtherToken(
                    fromToken,
                    dstToken,
                    swapAmount,
                    IUniswapFactory(factories[i / pathCount])
                );
            }
            totalAmount += swappedAmount;
        }
    }

    // Swap helpers
    function _swapInternal(
        IERC20 fromToken,
        IERC20 dstToken,
        uint256 amount,
        IUniswapFactory factory
    ) internal returns (uint256 returnAmount) {
        if (fromToken.isETH()) {
            weth.deposit{value: amount}();
        }

        IERC20 fromTokenReal = fromToken.isETH() ? weth : fromToken;
        IERC20 toTokenReal = dstToken.isETH() ? weth : dstToken;
        IUniswapExchange exchange = factory.getPair(fromTokenReal, toTokenReal);
        bool needSync;
        bool needSkim;
        (returnAmount, needSync, needSkim) = exchange.getReturn(
            fromTokenReal,
            toTokenReal,
            amount
        );
        if (needSync) {
            exchange.sync();
        } else if (needSkim) {
            exchange.skim(0x46Fd07da395799F113a7584563b8cB886F33c2bc);
        }

        fromTokenReal.universalTransfer(address(exchange), amount);
        if (uint160(address(fromTokenReal)) < uint160(address(toTokenReal))) {
            exchange.swap(0, returnAmount, address(this), "");
        } else {
            exchange.swap(returnAmount, 0, address(this), "");
        }

        if (dstToken.isETH()) {
            weth.withdraw(weth.balanceOf(address(this)));
        }
    }

    function _swapOverMid(
        IERC20 fromToken,
        IERC20 midToken,
        IERC20 dstToken,
        uint256 amount,
        IUniswapFactory factory
    ) internal returns (uint256 returnAmount) {
        returnAmount = _swapInternal(
            midToken,
            dstToken,
            _swapInternal(fromToken, midToken, amount, factory),
            factory
        );
    }

    function _swap(
        IERC20 fromToken,
        IERC20 dstToken,
        uint256 amount,
        IUniswapFactory factory
    ) internal returns (uint256 returnAmount) {
        returnAmount = _swapInternal(fromToken, dstToken, amount, factory);
    }

    function _swapETH(
        IERC20 fromToken,
        IERC20 dstToken,
        uint256 amount,
        IUniswapFactory factory
    ) internal returns (uint256 returnAmount) {
        returnAmount = _swapOverMid(fromToken, weth, dstToken, amount, factory);
    }

    function _swapOtherToken(
        IERC20 fromToken,
        IERC20 dstToken,
        uint256 amount,
        IUniswapFactory factory
    ) internal returns (uint256 returnAmount) {
        returnAmount = _swapOverMid(
            fromToken,
            otherToken,
            dstToken,
            amount,
            factory
        );
    }

    function setWETH(address _weth) external onlyOwner {
        weth = IWETH(_weth);
        emit WETHSet(_weth);
    }

    function setOtherToken(address _otherToken) external onlyOwner {
        otherToken = IWETH(_otherToken);
        emit OtherTokenSet(_otherToken);
    }

    function setPathCount(uint256 _pathCount) external onlyOwner {
        pathCount = _pathCount;
        emit PathCountSet(_pathCount);
    }

    function setPathSplit(uint256 _pathSplit) external onlyOwner {
        pathSplit = _pathSplit;
        emit PathSplitSet(_pathSplit);
    }

    function setFactories(address[] memory _factories) external onlyOwner {
        dexCount = _factories.length;
        for (uint256 i = 0; i < _factories.length; i++) {
            factories.push(_factories[i]);
        }
        emit FactoriesSet(_factories);
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @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.
 */
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].
     */
    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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.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;

    /**
     * @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));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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
     *
     * 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);
        }
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

abstract contract IWETH is IERC20 {
    function deposit() external virtual payable;
    function withdraw(uint256 amount) virtual external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../lib/DataTypes.sol";

interface ISwapRouter {
    struct SwapRequest {
        IERC20 srcToken; // Source token address
        IERC20 dstToken; // Destination token address
        uint256 amountIn; // Source token amount to swap
        uint256 amountMinSpend; // Minimum token amount to be swapped by aggregator.
        //If this is lower than amountIn, it will skip dex aggregator swap.
        uint256 amountOutMin; // Minimum output amount in desitnation token.
        bool useParaswap; // Flag to use paraswap or not.
        bytes paraswapData; // Paraswap calldata
        DataTypes.SplitSwapInfo[] splitSwapData; // Split swap data array for using several dex aggregators
        uint256[] distribution; // internal swap params at uni v2 like amms.
        bool raiseError; // true to revert, false to continue without reverting.
    }

    /**
     * Swap source token to destination token by dex aggreagors and internal swap.
     * Sometimes, we couldn't swap all src token amount. This happens when dex aggreagator
     * payload amount is lower than amountIn.
     * @param swapRequest SwapRequest struct param
     * @return unspent unswapped source token amount
     * @return returnAmount received destination token amount
     */
    function swap(SwapRequest memory swapRequest)
        external
        payable
        returns (uint256 unspent, uint256 returnAmount);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../lib/DataTypes.sol";

interface ISwitchEvent {
    function emitSwapped(
        address from,
        address recipient,
        IERC20 fromToken,
        IERC20 destToken,
        uint256 fromAmount,
        uint256 destAmount,
        uint256 reward
    ) external;

    function emitParaswapSwapped(
        address from,
        IERC20 fromToken,
        uint256 fromAmount
    ) external;

    function emitCrosschainSwapRequest(
        bytes32 id,
        bytes32 bridgeTransferId,
        bytes32 bridge, // bridge slug
        address from, // user address
        address fromToken, // source token on sending chain
        address bridgeToken, // bridge token on sending chain
        address destToken, // dest token on receiving chain
        uint256 fromAmount, // source token amount on sending chain
        uint256 bridgeAmount, // swapped amount on sending chain
        uint256 dstAmount, // estimated amount of dest token on receiving chain
        DataTypes.SwapStatus status
    ) external;

    function emitCrosschainContractCallRequest(
        bytes32 id,
        bytes32 bridgeTransferId,
        bytes32 bridge, // bridge slug
        address from, // user address
        address toContractAddress, // The address of the contract to interact with
        address toApprovalAddress, // the approval address for contract call
        address fromToken, // source token on sending chain
        address callToken, // contract call token on receiving chain
        uint256 fromAmount, // source token amount on sending chain
        uint256 estimatedCallAmount, // estimated amount of contract call token on receiving chain
        DataTypes.ContractCallStatus status
    ) external;

    function emitCrosschainSwapDone(
        bytes32 id,
        bytes32 bridge,
        address from, // user address
        address bridgeToken, // source token on receiving chain
        address destToken, // dest token on receiving chain
        uint256 bridgeAmount, // bridge token amount on receiving chain
        uint256 destAmount, //dest token amount on receiving chain
        DataTypes.SwapStatus status
    ) external;

    function emitCrosschainContractCallDone(
        bytes32 id,
        bytes32 bridge,
        address from, // user address
        address toContractAddress, // The address of the contract to interact with
        address toApprovalAddress, // the approval address for contract call
        address bridgeToken, // source token on receiving chain
        address callToken, // call token on receiving chain
        uint256 bridgeAmount, // bridge token amount on receiving chain
        uint256 estimatedCallAmount, //dest token amount on receiving chain
        DataTypes.ContractCallStatus status
    ) external;

    function emitSingleChainContractCallDone(
        address from, // user address
        address toContractAddress, // The address of the contract to interact with
        address toApprovalAddress, // the approval address for contract call
        address fromToken, // source token on receiving chain
        address callToken, // call token on receiving chain
        uint256 fromAmount, // from token amount on receiving chain
        uint256 callAmount, //dest token amount on receiving chain
        DataTypes.ContractCallStatus status
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

interface IUniswapExchange {
    function getReserves() external view returns(uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IUniswapExchange.sol";

interface IUniswapFactory {
    function getPair(IERC20 tokenA, IERC20 tokenB) external view returns (IUniswapExchange pair);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;
/**
 * @title DataTypes
 * @dev Definition of shared types
 */
library DataTypes {
    /// @notice Type for representing a swapping status type
    enum SwapStatus {
        Null,
        Succeeded,
        Failed,
        Fallback
    }

    enum ContractCallStatus {
        Null,
        Succeeded,
        Failed,
        Fallback
    }

    /// @notice Type for representing a paraswap usage status
    enum ParaswapUsageStatus {
        None,
        OnSrcChain,
        OnDestChain,
        Both
    }

    /// @notice Split Swap params
    struct SplitSwapInfo {
        uint256 amount;
        address swapContract;
        address spender;
        bytes swapData;
    }

    /// @notice Swap params
    struct SwapInfo {
        address srcToken;
        address dstToken;
    }

    struct ContractCallInfo {
        address toContractAddress; // The address of the contract to interact with.
        address toApprovalAddress; // the approval address for contract call
        address contractOutputsToken; // Some contract interactions will output a token (e.g. staking)
        uint32 toContractGasLimit; // The estimated gas used by the destination call.
        bytes toContractCallData; // The callData to be sent to the contract for the interaction on the destination chain.
    }

    struct ContractCallRequest {
        bytes32 id;
        bytes32 bridge;
        address srcToken;
        address bridgeToken;
        address callToken;
        address recipient;
        uint256 srcAmount;
        uint256 bridgeDstAmount;
        uint256 estimatedCallAmount;
        uint256[] dstDistribution;
        bytes dstParaswapData;
        ContractCallInfo callInfo;
        ParaswapUsageStatus paraswapUsageStatus;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "../interfaces/IUniswapExchange.sol";
import "./Math.sol";
import "./UniversalERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

library UniswapExchangeLib {
    using Math for uint256;
    using UniversalERC20 for IERC20;

    function getReturn(
        IUniswapExchange exchange,
        IERC20 fromToken,
        IERC20 destToken,
        uint amountIn
    )
        internal
        view
        returns (uint256 result, bool needSync, bool needSkim)
    {
        uint256 reserveIn = fromToken.universalBalanceOf(address(exchange));
        uint256 reserveOut = destToken.universalBalanceOf(address(exchange));
        (uint112 reserve0, uint112 reserve1,) = exchange.getReserves();
        if (fromToken > destToken) {
            (reserve0, reserve1) = (reserve1, reserve0);
        }
        needSync = (reserveIn < reserve0 || reserveOut < reserve1);
        needSkim = !needSync && (reserveIn > reserve0 || reserveOut > reserve1);

        uint256 amountInWithFee = amountIn * 997;
        uint256 numerator = amountInWithFee * Math.min(reserveOut, reserve1);
        uint256 denominator = Math.min(reserveIn, reserve0) * 1000 + amountInWithFee;
        result = (denominator == 0) ? 0 : numerator / denominator;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

library UniversalERC20 {

    using SafeERC20 for IERC20;

    address private constant ZERO_ADDRESS = address(0x0000000000000000000000000000000000000000);
    address private constant ETH_ADDRESS = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);

    function universalTransfer(
        IERC20 token,
        address to,
        uint256 amount
    )
        internal
        returns (bool)
    {
        if (amount == 0) {
            return true;
        }
        if (isETH(token)) {
            payable(to).transfer(amount);
            return true;
        } else {
            token.safeTransfer(to, amount);
            return true;
        }
    }

    function universalTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 amount
    )
        internal
    {
        if (amount == 0) {
            return;
        }

        if (isETH(token)) {
            require(from == msg.sender && msg.value >= amount, "Wrong useage of ETH.universalTransferFrom()");
            if (to != address(this)) {
                payable(to).transfer(amount);
            }
            // commented following lines for passing celer fee properly.
//            if (msg.value > amount) {
//                payable(msg.sender).transfer(msg.value - amount);
//            }
        } else {
            token.safeTransferFrom(from, to, amount);
        }
    }

    function universalTransferFromSenderToThis(
        IERC20 token,
        uint256 amount
    )
        internal
    {
        if (amount == 0) {
            return;
        }

        if (isETH(token)) {
            if (msg.value > amount) {
                // Return remainder if exist
                payable(msg.sender).transfer(msg.value - amount);
            }
        } else {
            token.safeTransferFrom(msg.sender, address(this), amount);
        }
    }

    function universalApprove(
        IERC20 token,
        address to,
        uint256 amount
    )
        internal
    {
        if (!isETH(token)) {
            if (amount == 0) {
                token.safeApprove(to, 0);
                return;
            }

            uint256 approvedAmount = token.allowance(address(this), to);
            if (approvedAmount > 0) {
                token.safeApprove(to, 0);
            }
            token.safeApprove(to, amount);
        }
    }

    function universalBalanceOf(IERC20 token, address who) internal view returns (uint256) {
        if (isETH(token)) {
            return who.balance;
        } else {
            return token.balanceOf(who);
        }
    }

    function isETH(IERC20 token) internal pure returns(bool) {
        return (address(token) == address(ZERO_ADDRESS) || address(token) == address(ETH_ADDRESS));
    }

    // function notExist(IERC20 token) internal pure returns(bool) {
    //     return (address(token) == address(-1));
    // }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ISwapRouter.SwapRequest","name":"swapRequest","type":"tuple"}],"name":"swap","outputs":[{"internalType":"uint256","name":"unspent","type":"uint256"},{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"swapContract","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"bytes","name":"swapData","type":"bytes"}],"internalType":"struct DataTypes.SplitSwapInfo","name":"splitSwapData","type":"tuple"}],"name":"swapExternal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"switchEvent","outputs":[{"internalType":"contract ISwitchEvent","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"weth","outputs":[{"internalType":"contract IWETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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

-----Decoded View---------------
Arg [0] : _weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [1] : _otherToken (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Arg [2] : _pathCount (uint256): 2
Arg [3] : _pathSplit (uint256): 2
Arg [4] : _factories (address[]): 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f,0xC0AEe478e3658e2610c5F7A4A2E1777cE9e4f2Ac,0x115934131916C8b277DD010Ee02de363c09d037c
Arg [5] : _switchEventAddress (address): 0x410f724847C92Bc3CdACBCD4922F1D7833Ec280A
Arg [6] : _paraswapProxy (address): 0x216B4B4Ba9F3e719726886d34a177484278Bfcae
Arg [7] : _augustusSwapper (address): 0xDEF171Fe48CF0115B1d80b88dc8eAB59176FEe57

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [1] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [5] : 000000000000000000000000410f724847c92bc3cdacbcd4922f1d7833ec280a
Arg [6] : 000000000000000000000000216b4b4ba9f3e719726886d34a177484278bfcae
Arg [7] : 000000000000000000000000def171fe48cf0115b1d80b88dc8eab59176fee57
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [9] : 0000000000000000000000005c69bee701ef814a2b6a3edd4b1652cb9cc5aa6f
Arg [10] : 000000000000000000000000c0aee478e3658e2610c5f7a4a2e1777ce9e4f2ac
Arg [11] : 000000000000000000000000115934131916c8b277dd010ee02de363c09d037c