/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

import {IDODOApprove} from "../intf/IDODOApprove.sol";
import {InitializableOwnable} from "../lib/InitializableOwnable.sol";

interface IDODOApproveProxy {
    function isAllowedProxy(address _proxy) external view returns (bool);
    function claimTokens(address token,address who,address dest,uint256 amount) external;
}

/**
 * @title DODOApproveProxy
 * @author DODO Breeder
 *
 * @notice Allow different version dodoproxy to claim from DODOApprove
 */
contract DODOApproveProxy is InitializableOwnable {
    
    // ============ Storage ============
    uint256 private constant _TIMELOCK_DURATION_ = 3 days;
    mapping (address => bool) public _IS_ALLOWED_PROXY_;
    uint256 public _TIMELOCK_;
    address public _PENDING_ADD_DODO_PROXY_;
    address public immutable _DODO_APPROVE_;

    // ============ Modifiers ============
    modifier notLocked() {
        require(
            _TIMELOCK_ <= block.timestamp,
            "SetProxy is timelocked"
        );
        _;
    }

    constructor(address dodoApporve) public {
        _DODO_APPROVE_ = dodoApporve;
    }

    function init(address owner, address[] memory proxies) external {
        initOwner(owner);
        for(uint i = 0; i < proxies.length; i++) 
            _IS_ALLOWED_PROXY_[proxies[i]] = true;
    }

    function unlockAddProxy(address newDodoProxy) public onlyOwner {
        _TIMELOCK_ = block.timestamp + _TIMELOCK_DURATION_;
        _PENDING_ADD_DODO_PROXY_ = newDodoProxy;
    }

    function lockAddProxy() public onlyOwner {
       _PENDING_ADD_DODO_PROXY_ = address(0);
       _TIMELOCK_ = 0;
    }


    function addDODOProxy() external onlyOwner notLocked() {
        _IS_ALLOWED_PROXY_[_PENDING_ADD_DODO_PROXY_] = true;
        lockAddProxy();
    }

    function removeDODOProxy (address oldDodoProxy) public onlyOwner {
        _IS_ALLOWED_PROXY_[oldDodoProxy] = false;
    }
    
    function claimTokens(
        address token,
        address who,
        address dest,
        uint256 amount
    ) external {
        require(_IS_ALLOWED_PROXY_[msg.sender], "DODOApproveProxy:Access restricted");
        IDODOApprove(_DODO_APPROVE_).claimTokens(
            token,
            who,
            dest,
            amount
        );
    }

    function isAllowedProxy(address _proxy) external view returns (bool) {
        return _IS_ALLOWED_PROXY_[_proxy];
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

import {IDODOV1} from "../intf/IDODOV1.sol";
import {SafeMath} from "../../lib/SafeMath.sol";
import {DecimalMath} from "../../lib/DecimalMath.sol";

// import {DODOMath} from "../lib/DODOMath.sol";

interface IDODOSellHelper {
    function querySellQuoteToken(address dodo, uint256 amount) external view returns (uint256);
    
    function querySellBaseToken(address dodo, uint256 amount) external view returns (uint256);
}

library DODOMath {
    using SafeMath for uint256;

    /*
        Integrate dodo curve fron V1 to V2
        require V0>=V1>=V2>0
        res = (1-k)i(V1-V2)+ikV0*V0(1/V2-1/V1)
        let V1-V2=delta
        res = i*delta*(1-k+k(V0^2/V1/V2))
    */
    function _GeneralIntegrate(
        uint256 V0,
        uint256 V1,
        uint256 V2,
        uint256 i,
        uint256 k
    ) internal pure returns (uint256) {
        uint256 fairAmount = DecimalMath.mulFloor(i, V1.sub(V2)); // i*delta
        uint256 V0V0V1V2 = DecimalMath.divCeil(V0.mul(V0).div(V1), V2);
        uint256 penalty = DecimalMath.mulFloor(k, V0V0V1V2); // k(V0^2/V1/V2)
        return DecimalMath.mulFloor(fairAmount, DecimalMath.ONE.sub(k).add(penalty));
    }

    /*
        The same with integration expression above, we have:
        i*deltaB = (Q2-Q1)*(1-k+kQ0^2/Q1/Q2)
        Given Q1 and deltaB, solve Q2
        This is a quadratic function and the standard version is
        aQ2^2 + bQ2 + c = 0, where
        a=1-k
        -b=(1-k)Q1-kQ0^2/Q1+i*deltaB
        c=-kQ0^2
        and Q2=(-b+sqrt(b^2+4(1-k)kQ0^2))/2(1-k)
        note: another root is negative, abondan
        if deltaBSig=true, then Q2>Q1
        if deltaBSig=false, then Q2<Q1
    */
    function _SolveQuadraticFunctionForTrade(
        uint256 Q0,
        uint256 Q1,
        uint256 ideltaB,
        bool deltaBSig,
        uint256 k
    ) internal pure returns (uint256) {
        // calculate -b value and sig
        // -b = (1-k)Q1-kQ0^2/Q1+i*deltaB
        uint256 kQ02Q1 = DecimalMath.mulFloor(k, Q0).mul(Q0).div(Q1); // kQ0^2/Q1
        uint256 b = DecimalMath.mulFloor(DecimalMath.ONE.sub(k), Q1); // (1-k)Q1
        bool minusbSig = true;
        if (deltaBSig) {
            b = b.add(ideltaB); // (1-k)Q1+i*deltaB
        } else {
            kQ02Q1 = kQ02Q1.add(ideltaB); // i*deltaB+kQ0^2/Q1
        }
        if (b >= kQ02Q1) {
            b = b.sub(kQ02Q1);
            minusbSig = true;
        } else {
            b = kQ02Q1.sub(b);
            minusbSig = false;
        }

        // calculate sqrt
        uint256 squareRoot = DecimalMath.mulFloor(
            DecimalMath.ONE.sub(k).mul(4),
            DecimalMath.mulFloor(k, Q0).mul(Q0)
        ); // 4(1-k)kQ0^2
        squareRoot = b.mul(b).add(squareRoot).sqrt(); // sqrt(b*b+4(1-k)kQ0*Q0)

        // final res
        uint256 denominator = DecimalMath.ONE.sub(k).mul(2); // 2(1-k)
        uint256 numerator;
        if (minusbSig) {
            numerator = b.add(squareRoot);
        } else {
            numerator = squareRoot.sub(b);
        }

        if (deltaBSig) {
            return DecimalMath.divFloor(numerator, denominator);
        } else {
            return DecimalMath.divCeil(numerator, denominator);
        }
    }

    /*
        Start from the integration function
        i*deltaB = (Q2-Q1)*(1-k+kQ0^2/Q1/Q2)
        Assume Q2=Q0, Given Q1 and deltaB, solve Q0
        let fairAmount = i*deltaB
    */
    function _SolveQuadraticFunctionForTarget(
        uint256 V1,
        uint256 k,
        uint256 fairAmount
    ) internal pure returns (uint256 V0) {
        // V0 = V1+V1*(sqrt-1)/2k
        uint256 sqrt = DecimalMath.divCeil(DecimalMath.mulFloor(k, fairAmount).mul(4), V1);
        sqrt = sqrt.add(DecimalMath.ONE).mul(DecimalMath.ONE).sqrt();
        uint256 premium = DecimalMath.divCeil(sqrt.sub(DecimalMath.ONE), k.mul(2));
        // V0 is greater than or equal to V1 according to the solution
        return DecimalMath.mulFloor(V1, DecimalMath.ONE.add(premium));
    }
}

contract DODOSellHelper {
    using SafeMath for uint256;

    enum RStatus {ONE, ABOVE_ONE, BELOW_ONE}

    uint256 constant ONE = 10**18;

    struct DODOState {
        uint256 oraclePrice;
        uint256 K;
        uint256 B;
        uint256 Q;
        uint256 baseTarget;
        uint256 quoteTarget;
        RStatus rStatus;
    }

    function querySellBaseToken(address dodo, uint256 amount) public view returns (uint256) {
        return IDODOV1(dodo).querySellBaseToken(amount);
    }

    function querySellQuoteToken(address dodo, uint256 amount) public view returns (uint256) {
        DODOState memory state;
        (state.baseTarget, state.quoteTarget) = IDODOV1(dodo).getExpectedTarget();
        state.rStatus = RStatus(IDODOV1(dodo)._R_STATUS_());
        state.oraclePrice = IDODOV1(dodo).getOraclePrice();
        state.Q = IDODOV1(dodo)._QUOTE_BALANCE_();
        state.B = IDODOV1(dodo)._BASE_BALANCE_();
        state.K = IDODOV1(dodo)._K_();

        uint256 boughtAmount;
        // Determine the status (RStatus) and calculate the amount
        // based on the state
        if (state.rStatus == RStatus.ONE) {
            boughtAmount = _ROneSellQuoteToken(amount, state);
        } else if (state.rStatus == RStatus.ABOVE_ONE) {
            boughtAmount = _RAboveSellQuoteToken(amount, state);
        } else {
            uint256 backOneBase = state.B.sub(state.baseTarget);
            uint256 backOneQuote = state.quoteTarget.sub(state.Q);
            if (amount <= backOneQuote) {
                boughtAmount = _RBelowSellQuoteToken(amount, state);
            } else {
                boughtAmount = backOneBase.add(
                    _ROneSellQuoteToken(amount.sub(backOneQuote), state)
                );
            }
        }
        // Calculate fees
        return
            DecimalMath.divFloor(
                boughtAmount,
                DecimalMath.ONE.add(IDODOV1(dodo)._MT_FEE_RATE_()).add(
                    IDODOV1(dodo)._LP_FEE_RATE_()
                )
            );
    }

    function _ROneSellQuoteToken(uint256 amount, DODOState memory state)
        internal
        pure
        returns (uint256 receiveBaseToken)
    {
        uint256 i = DecimalMath.divFloor(ONE, state.oraclePrice);
        uint256 B2 = DODOMath._SolveQuadraticFunctionForTrade(
            state.baseTarget,
            state.baseTarget,
            DecimalMath.mulFloor(i, amount),
            false,
            state.K
        );
        return state.baseTarget.sub(B2);
    }

    function _RAboveSellQuoteToken(uint256 amount, DODOState memory state)
        internal
        pure
        returns (uint256 receieBaseToken)
    {
        uint256 i = DecimalMath.divFloor(ONE, state.oraclePrice);
        uint256 B2 = DODOMath._SolveQuadraticFunctionForTrade(
            state.baseTarget,
            state.B,
            DecimalMath.mulFloor(i, amount),
            false,
            state.K
        );
        return state.B.sub(B2);
    }

    function _RBelowSellQuoteToken(uint256 amount, DODOState memory state)
        internal
        pure
        returns (uint256 receiveBaseToken)
    {
        uint256 Q1 = state.Q.add(amount);
        uint256 i = DecimalMath.divFloor(ONE, state.oraclePrice);
        return DODOMath._GeneralIntegrate(state.quoteTarget, Q1, state.Q, i, state.K);
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;

import {IDODOV2Proxy01} from "./intf/IDODOV2Proxy01.sol";
import {IDODOV2} from "./intf/IDODOV2.sol";
import {IDODOV1} from "./intf/IDODOV1.sol";
import {IDODOApproveProxy} from "./DODOApproveProxy.sol";
import {IDODOSellHelper} from "./helper/DODOSellHelper.sol";
import {IERC20} from "../intf/IERC20.sol";
import {IWETH} from "../intf/IWETH.sol";
import {IUni} from "./intf/IUni.sol";
import {SafeMath} from "../lib/SafeMath.sol";
import {UniversalERC20} from "./lib/UniversalERC20.sol";
import {SafeERC20} from "../lib/SafeERC20.sol";
import {DecimalMath} from "../lib/DecimalMath.sol";
import {ReentrancyGuard} from "../lib/ReentrancyGuard.sol";
import {InitializableOwnable} from "../lib/InitializableOwnable.sol";
import {IDODOAdapter} from "./intf/IDODOAdapter.sol";

/**
 * @title DODOV2Proxy02
 * @author DODO Breeder
 *
 * @notice Entrance of trading in DODO platform
 */
contract DODOV2Proxy02 is IDODOV2Proxy01, ReentrancyGuard, InitializableOwnable {
    using SafeMath for uint256;
    using UniversalERC20 for IERC20;

    // ============ Storage ============

    address constant _ETH_ADDRESS_ = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address public immutable _WETH_;
    address public immutable _DODO_APPROVE_PROXY_;
    address public immutable _DODO_SELL_HELPER_;
    address public immutable _DVM_FACTORY_;
    mapping (address => bool) public isWhiteListed;

    // ============ Events ============

    event OrderHistory(
        address fromToken,
        address toToken,
        address sender,
        uint256 fromAmount,
        uint256 returnAmount
    );

    // ============ Modifiers ============

    modifier judgeExpired(uint256 deadLine) {
        require(deadLine >= block.timestamp, "DODOV2Proxy02: EXPIRED");
        _;
    }

    fallback() external payable {}

    receive() external payable {}

    constructor(
        address dvmFactory,
        address payable weth,
        address dodoApproveProxy,
        address dodoSellHelper
    ) public {
        _DVM_FACTORY_ = dvmFactory;
        _WETH_ = weth;
        _DODO_APPROVE_PROXY_ = dodoApproveProxy;
        _DODO_SELL_HELPER_ = dodoSellHelper;
    }

    function addWhiteList (address contractAddr) public onlyOwner {
        isWhiteListed[contractAddr] = true;
    }

    function removeWhiteList (address contractAddr) public onlyOwner {
        isWhiteListed[contractAddr] = false;
    }

    // ============ DVM Functions (create & add liquidity) ============

    function createDODOVendingMachine(
        address baseToken,
        address quoteToken,
        uint256 baseInAmount,
        uint256 quoteInAmount,
        uint256 lpFeeRate,
        uint256 i,
        uint256 k,
        bool isOpenTWAP,
        uint256 deadLine
    )
        external
        override
        payable
        preventReentrant
        judgeExpired(deadLine)
        returns (address newVendingMachine, uint256 shares)
    {
        {
            address _baseToken = baseToken == _ETH_ADDRESS_ ? _WETH_ : baseToken;
            address _quoteToken = quoteToken == _ETH_ADDRESS_ ? _WETH_ : quoteToken;
            newVendingMachine = IDODOV2(_DVM_FACTORY_).createDODOVendingMachine(
                _baseToken,
                _quoteToken,
                lpFeeRate,
                i,
                k,
                isOpenTWAP
            );
        }

        {
            address _baseToken = baseToken;
            address _quoteToken = quoteToken;
            _deposit(
                msg.sender,
                newVendingMachine,
                _baseToken,
                baseInAmount,
                _baseToken == _ETH_ADDRESS_
            );
            _deposit(
                msg.sender,
                newVendingMachine,
                _quoteToken,
                quoteInAmount,
                _quoteToken == _ETH_ADDRESS_
            );
        }

        (shares, , ) = IDODOV2(newVendingMachine).buyShares(msg.sender);
    }

    function addDVMLiquidity(
        address dvmAddress,
        uint256 baseInAmount,
        uint256 quoteInAmount,
        uint256 baseMinAmount,
        uint256 quoteMinAmount,
        uint8 flag, // 0 - ERC20, 1 - baseInETH, 2 - quoteInETH
        uint256 deadLine
    )
        external
        override
        payable
        preventReentrant
        judgeExpired(deadLine)
        returns (
            uint256 shares,
            uint256 baseAdjustedInAmount,
            uint256 quoteAdjustedInAmount
        )
    {
        address _dvm = dvmAddress;
        (baseAdjustedInAmount, quoteAdjustedInAmount) = _addDVMLiquidity(
            _dvm,
            baseInAmount,
            quoteInAmount
        );
        require(
            baseAdjustedInAmount >= baseMinAmount && quoteAdjustedInAmount >= quoteMinAmount,
            "DODOV2Proxy02: deposit amount is not enough"
        );

        _deposit(msg.sender, _dvm, IDODOV2(_dvm)._BASE_TOKEN_(), baseAdjustedInAmount, flag == 1);
        _deposit(msg.sender, _dvm, IDODOV2(_dvm)._QUOTE_TOKEN_(), quoteAdjustedInAmount, flag == 2);
        
        (shares, , ) = IDODOV2(_dvm).buyShares(msg.sender);
        // refund dust eth
        if (flag == 1 && msg.value > baseAdjustedInAmount) msg.sender.transfer(msg.value - baseAdjustedInAmount);
        if (flag == 2 && msg.value > quoteAdjustedInAmount) msg.sender.transfer(msg.value - quoteAdjustedInAmount);
    }

    function _addDVMLiquidity(
        address dvmAddress,
        uint256 baseInAmount,
        uint256 quoteInAmount
    ) internal view returns (uint256 baseAdjustedInAmount, uint256 quoteAdjustedInAmount) {
        (uint256 baseReserve, uint256 quoteReserve) = IDODOV2(dvmAddress).getVaultReserve();
        if (quoteReserve == 0 && baseReserve == 0) {
            baseAdjustedInAmount = baseInAmount;
            quoteAdjustedInAmount = quoteInAmount;
        }
        if (quoteReserve == 0 && baseReserve > 0) {
            baseAdjustedInAmount = baseInAmount;
            quoteAdjustedInAmount = 0;
        }
        if (quoteReserve > 0 && baseReserve > 0) {
            uint256 baseIncreaseRatio = DecimalMath.divFloor(baseInAmount, baseReserve);
            uint256 quoteIncreaseRatio = DecimalMath.divFloor(quoteInAmount, quoteReserve);
            if (baseIncreaseRatio <= quoteIncreaseRatio) {
                baseAdjustedInAmount = baseInAmount;
                quoteAdjustedInAmount = DecimalMath.mulFloor(quoteReserve, baseIncreaseRatio);
            } else {
                quoteAdjustedInAmount = quoteInAmount;
                baseAdjustedInAmount = DecimalMath.mulFloor(baseReserve, quoteIncreaseRatio);
            }
        }
    }

    // ============ Swap ============

    function dodoSwapV2ETHToToken(
        address toToken,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool,
        uint256 deadLine
    )
        external
        override
        payable
        judgeExpired(deadLine)
        returns (uint256 returnAmount)
    {
        require(dodoPairs.length > 0, "DODOV2Proxy02: PAIRS_EMPTY");
        require(minReturnAmount > 0, "DODOV2Proxy02: RETURN_AMOUNT_ZERO");
        
        uint256 originToTokenBalance = IERC20(toToken).balanceOf(msg.sender);
        IWETH(_WETH_).deposit{value: msg.value}();
        IWETH(_WETH_).transfer(dodoPairs[0], msg.value);

        for (uint256 i = 0; i < dodoPairs.length; i++) {
            if (i == dodoPairs.length - 1) {
                if (directions & 1 == 0) {
                    IDODOV2(dodoPairs[i]).sellBase(msg.sender);
                } else {
                    IDODOV2(dodoPairs[i]).sellQuote(msg.sender);
                }
            } else {
                if (directions & 1 == 0) {
                    IDODOV2(dodoPairs[i]).sellBase(dodoPairs[i + 1]);
                } else {
                    IDODOV2(dodoPairs[i]).sellQuote(dodoPairs[i + 1]);
                }
            }
            directions = directions >> 1;
        }

        returnAmount = IERC20(toToken).balanceOf(msg.sender).sub(originToTokenBalance);
        require(returnAmount >= minReturnAmount, "DODOV2Proxy02: Return amount is not enough");

        emit OrderHistory(
            _ETH_ADDRESS_,
            toToken,
            msg.sender,
            msg.value,
            returnAmount
        );
    }

    function dodoSwapV2TokenToETH(
        address fromToken,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool,
        uint256 deadLine
    )
        external
        override
        judgeExpired(deadLine)
        returns (uint256 returnAmount)
    {
        require(dodoPairs.length > 0, "DODOV2Proxy02: PAIRS_EMPTY");
        require(minReturnAmount > 0, "DODOV2Proxy02: RETURN_AMOUNT_ZERO");
        
        IDODOApproveProxy(_DODO_APPROVE_PROXY_).claimTokens(fromToken, msg.sender, dodoPairs[0], fromTokenAmount);

        for (uint256 i = 0; i < dodoPairs.length; i++) {
            if (i == dodoPairs.length - 1) {
                if (directions & 1 == 0) {
                    IDODOV2(dodoPairs[i]).sellBase(address(this));
                } else {
                    IDODOV2(dodoPairs[i]).sellQuote(address(this));
                }
            } else {
                if (directions & 1 == 0) {
                    IDODOV2(dodoPairs[i]).sellBase(dodoPairs[i + 1]);
                } else {
                    IDODOV2(dodoPairs[i]).sellQuote(dodoPairs[i + 1]);
                }
            }
            directions = directions >> 1;
        }
        returnAmount = IWETH(_WETH_).balanceOf(address(this));
        require(returnAmount >= minReturnAmount, "DODOV2Proxy02: Return amount is not enough");
        IWETH(_WETH_).withdraw(returnAmount);
        msg.sender.transfer(returnAmount);

        emit OrderHistory(
            fromToken,
            _ETH_ADDRESS_,
            msg.sender,
            fromTokenAmount,
            returnAmount
        );
    }

    function dodoSwapV2TokenToToken(
        address fromToken,
        address toToken,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool,
        uint256 deadLine
    )
        external
        override
        judgeExpired(deadLine)
        returns (uint256 returnAmount)
    {
        require(dodoPairs.length > 0, "DODOV2Proxy02: PAIRS_EMPTY");
        require(minReturnAmount > 0, "DODOV2Proxy02: RETURN_AMOUNT_ZERO");

        uint256 originToTokenBalance = IERC20(toToken).balanceOf(msg.sender);
        IDODOApproveProxy(_DODO_APPROVE_PROXY_).claimTokens(fromToken, msg.sender, dodoPairs[0], fromTokenAmount);

        for (uint256 i = 0; i < dodoPairs.length; i++) {
            if (i == dodoPairs.length - 1) {
                if (directions & 1 == 0) {
                    IDODOV2(dodoPairs[i]).sellBase(msg.sender);
                } else {
                    IDODOV2(dodoPairs[i]).sellQuote(msg.sender);
                }
            } else {
                if (directions& 1 == 0) {
                    IDODOV2(dodoPairs[i]).sellBase(dodoPairs[i + 1]);
                } else {
                    IDODOV2(dodoPairs[i]).sellQuote(dodoPairs[i + 1]);
                }
            }
            directions = directions >> 1;
        }
        returnAmount = IERC20(toToken).balanceOf(msg.sender).sub(originToTokenBalance);
        require(returnAmount >= minReturnAmount, "DODOV2Proxy02: Return amount is not enough");

        emit OrderHistory(
            fromToken,
            toToken,
            msg.sender,
            fromTokenAmount,
            returnAmount
        );
    }

    function externalSwap(
        address fromToken,
        address toToken,
        address approveTarget,
        address swapTarget,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        bytes memory callDataConcat,
        bool,
        uint256 deadLine
    )
        external
        override
        payable
        judgeExpired(deadLine)
        returns (uint256 returnAmount)
    {
        require(minReturnAmount > 0, "DODOV2Proxy02: RETURN_AMOUNT_ZERO");
        
        uint256 toTokenOriginBalance = IERC20(toToken).universalBalanceOf(msg.sender);
        if (fromToken != _ETH_ADDRESS_) {
            IDODOApproveProxy(_DODO_APPROVE_PROXY_).claimTokens(
                fromToken,
                msg.sender,
                address(this),
                fromTokenAmount
            );
            IERC20(fromToken).universalApproveMax(approveTarget, fromTokenAmount);
        }

        require(isWhiteListed[swapTarget], "DODOV2Proxy02: Not Whitelist Contract");
        (bool success, ) = swapTarget.call{value: fromToken == _ETH_ADDRESS_ ? msg.value : 0}(callDataConcat);

        require(success, "DODOV2Proxy02: External Swap execution Failed");

        IERC20(toToken).universalTransfer(
            msg.sender,
            IERC20(toToken).universalBalanceOf(address(this))
        );

        returnAmount = IERC20(toToken).universalBalanceOf(msg.sender).sub(toTokenOriginBalance);
        require(returnAmount >= minReturnAmount, "DODOV2Proxy02: Return amount is not enough");

        emit OrderHistory(
            fromToken,
            toToken,
            msg.sender,
            fromTokenAmount,
            returnAmount
        );
    }

    function dodoSwapV1(
        address fromToken,
        address toToken,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool,
        uint256 deadLine
    )
        external
        override
        payable
        judgeExpired(deadLine)
        returns (uint256 returnAmount)
    {
        require(dodoPairs.length > 0, "DODOV2Proxy02: PAIRS_EMPTY");
        require(minReturnAmount > 0, "DODOV2Proxy02: RETURN_AMOUNT_ZERO");
        

        address _fromToken = fromToken;
        address _toToken = toToken;
        
        _deposit(msg.sender, address(this), _fromToken, fromTokenAmount, _fromToken == _ETH_ADDRESS_);

        for (uint256 i = 0; i < dodoPairs.length; i++) {
            address curDodoPair = dodoPairs[i];
            if (directions & 1 == 0) {
                address curDodoBase = IDODOV1(curDodoPair)._BASE_TOKEN_();
                uint256 curAmountIn = IERC20(curDodoBase).balanceOf(address(this));
                IERC20(curDodoBase).universalApproveMax(curDodoPair, curAmountIn);
                IDODOV1(curDodoPair).sellBaseToken(curAmountIn, 0, "");
            } else {
                address curDodoQuote = IDODOV1(curDodoPair)._QUOTE_TOKEN_();
                uint256 curAmountIn = IERC20(curDodoQuote).balanceOf(address(this));
                IERC20(curDodoQuote).universalApproveMax(curDodoPair, curAmountIn);
                uint256 canBuyBaseAmount = IDODOSellHelper(_DODO_SELL_HELPER_).querySellQuoteToken(
                    curDodoPair,
                    curAmountIn
                );
                IDODOV1(curDodoPair).buyBaseToken(canBuyBaseAmount, curAmountIn, "");
            }
            directions = directions >> 1;
        }

        
        if (_toToken == _ETH_ADDRESS_) {
            returnAmount = IWETH(_WETH_).balanceOf(address(this));
            IWETH(_WETH_).withdraw(returnAmount);
        } else {
            returnAmount = IERC20(_toToken).tokenBalanceOf(address(this));
        }
        
        require(returnAmount >= minReturnAmount, "DODOV2Proxy02: Return amount is not enough");
        IERC20(_toToken).universalTransfer(msg.sender, returnAmount);

        emit OrderHistory(_fromToken, _toToken, msg.sender, fromTokenAmount, returnAmount);
    }

    //============ CrowdPooling Functions (bid) ============
    // function bid(
    //     address cpAddress,
    //     uint256 quoteAmount,
    //     uint8 flag, // 0 - ERC20, 1 - quoteInETH
    //     uint256 deadLine
    // ) external override payable preventReentrant judgeExpired(deadLine) {
    //     _deposit(msg.sender, cpAddress, IDODOV2(cpAddress)._QUOTE_TOKEN_(), quoteAmount, flag == 1);
    //     IDODOV2(cpAddress).bid(msg.sender);
    // }


    function addLiquidityToV1(
        address pair,
        uint256 baseAmount,
        uint256 quoteAmount,
        uint256 baseMinShares,
        uint256 quoteMinShares,
        uint8 flag, // 0 erc20 In  1 baseInETH  2 quoteIn ETH 
        uint256 deadLine
    ) external override payable preventReentrant judgeExpired(deadLine) returns(uint256 baseShares, uint256 quoteShares) {
        address _baseToken = IDODOV1(pair)._BASE_TOKEN_();
        address _quoteToken = IDODOV1(pair)._QUOTE_TOKEN_();
        
        _deposit(msg.sender, address(this), _baseToken, baseAmount, flag == 1);
        _deposit(msg.sender, address(this), _quoteToken, quoteAmount, flag == 2);

        
        if(baseAmount > 0) {
            IERC20(_baseToken).universalApproveMax(pair, baseAmount);
            baseShares = IDODOV1(pair).depositBaseTo(msg.sender, baseAmount);
        }
        if(quoteAmount > 0) {
            IERC20(_quoteToken).universalApproveMax(pair, quoteAmount);
            quoteShares = IDODOV1(pair).depositQuoteTo(msg.sender, quoteAmount);
        }

        require(baseShares >= baseMinShares && quoteShares >= quoteMinShares,"DODOV2Proxy02: Return DLP is not enough");
    }
    

    function _deposit(
        address from,
        address to,
        address token,
        uint256 amount,
        bool isETH
    ) internal {
        if (isETH) {
            if (amount > 0) {
                require(msg.value == amount, "ETH_VALUE_WRONG");
                IWETH(_WETH_).deposit{value: amount}();
                if (to != address(this)) SafeERC20.safeTransfer(IERC20(_WETH_), to, amount);
            }
        } else {
            IDODOApproveProxy(_DODO_APPROVE_PROXY_).claimTokens(token, from, to, amount);
        }
    }

    function _withdraw(
        address payable to,
        address token,
        uint256 amount,
        bool isETH
    ) internal {
        if (isETH) {
            if (amount > 0) {
                IWETH(_WETH_).withdraw(amount);
                to.transfer(amount);
            }
        } else {
            if (amount > 0) {
                SafeERC20.safeTransfer(IERC20(token), to, amount);
            }
        }
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

import {SafeMath} from "./SafeMath.sol";

/**
 * @title DecimalMath
 * @author DODO Breeder
 *
 * @notice Functions for fixed point number with 18 decimals
 */
library DecimalMath {
    using SafeMath for uint256;

    uint256 internal constant ONE = 10**18;
    uint256 internal constant ONE2 = 10**36;

    function mulFloor(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(d) / (10**18);
    }

    function mulCeil(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(d).divCeil(10**18);
    }

    function divFloor(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(10**18).div(d);
    }

    function divCeil(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(10**18).divCeil(d);
    }

    function reciprocalFloor(uint256 target) internal pure returns (uint256) {
        return uint256(10**36).div(target);
    }

    function reciprocalCeil(uint256 target) internal pure returns (uint256) {
        return uint256(10**36).divCeil(target);
    }

    function powFloor(uint256 target, uint256 e) internal pure returns (uint256) {
        if (e == 0) {
            return 10 ** 18;
        } else if (e == 1) {
            return target;
        } else {
            uint p = powFloor(target, e.div(2));
            p = p.mul(p) / (10**18);
            if (e % 2 == 1) {
                p = p.mul(target) / (10**18);
            }
            return p;
        }
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

interface IDODOAdapter {
    
    function sellBase(address to, address pool, bytes memory data) external;

    function sellQuote(address to, address pool, bytes memory data) external;
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;

interface IDODOApprove {
    function claimTokens(address token,address who,address dest,uint256 amount) external;
    function getDODOProxy() external view returns (address);
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

interface IDODOV1 {
    function init(
        address owner,
        address supervisor,
        address maintainer,
        address baseToken,
        address quoteToken,
        address oracle,
        uint256 lpFeeRate,
        uint256 mtFeeRate,
        uint256 k,
        uint256 gasPriceLimit
    ) external;

    function transferOwnership(address newOwner) external;

    function claimOwnership() external;

    function sellBaseToken(
        uint256 amount,
        uint256 minReceiveQuote,
        bytes calldata data
    ) external returns (uint256);

    function buyBaseToken(
        uint256 amount,
        uint256 maxPayQuote,
        bytes calldata data
    ) external returns (uint256);

    function querySellBaseToken(uint256 amount) external view returns (uint256 receiveQuote);

    function queryBuyBaseToken(uint256 amount) external view returns (uint256 payQuote);

    function depositBaseTo(address to, uint256 amount) external returns (uint256);

    function withdrawBase(uint256 amount) external returns (uint256);

    function withdrawAllBase() external returns (uint256);

    function depositQuoteTo(address to, uint256 amount) external returns (uint256);

    function withdrawQuote(uint256 amount) external returns (uint256);

    function withdrawAllQuote() external returns (uint256);

    function _BASE_CAPITAL_TOKEN_() external returns (address);

    function _QUOTE_CAPITAL_TOKEN_() external returns (address);

    function _BASE_TOKEN_() external view returns (address);

    function _QUOTE_TOKEN_() external view returns (address);

    function _R_STATUS_() external view returns (uint8);

    function _QUOTE_BALANCE_() external view returns (uint256);

    function _BASE_BALANCE_() external view returns (uint256);

    function _K_() external view returns (uint256);

    function _MT_FEE_RATE_() external view returns (uint256);

    function _LP_FEE_RATE_() external view returns (uint256);

    function getExpectedTarget() external view returns (uint256 baseTarget, uint256 quoteTarget);

    function getOraclePrice() external view returns (uint256);

    function getMidPrice() external view returns (uint256 midPrice); 
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

interface IDODOV2 {

    //========== Common ==================

    function sellBase(address to) external returns (uint256 receiveQuoteAmount);

    function sellQuote(address to) external returns (uint256 receiveBaseAmount);

    function getVaultReserve() external view returns (uint256 baseReserve, uint256 quoteReserve);

    function _BASE_TOKEN_() external view returns (address);

    function _QUOTE_TOKEN_() external view returns (address);

    function getPMMStateForCall() external view returns (
            uint256 i,
            uint256 K,
            uint256 B,
            uint256 Q,
            uint256 B0,
            uint256 Q0,
            uint256 R
    );

    function getUserFeeRate(address user) external view returns (uint256 lpFeeRate, uint256 mtFeeRate);

    
    function getDODOPoolBidirection(address token0, address token1) external view returns (address[] memory, address[] memory);

    //========== DODOVendingMachine ========
    
    function createDODOVendingMachine(
        address baseToken,
        address quoteToken,
        uint256 lpFeeRate,
        uint256 i,
        uint256 k,
        bool isOpenTWAP
    ) external returns (address newVendingMachine);
    
    function buyShares(address to) external returns (uint256,uint256,uint256);


    //========== DODOPrivatePool ===========

    function createDODOPrivatePool() external returns (address newPrivatePool);

    function initDODOPrivatePool(
        address dppAddress,
        address creator,
        address baseToken,
        address quoteToken,
        uint256 lpFeeRate,
        uint256 k,
        uint256 i,
        bool isOpenTwap
    ) external;

    function reset(
        address operator,
        uint256 newLpFeeRate,
        uint256 newI,
        uint256 newK,
        uint256 baseOutAmount,
        uint256 quoteOutAmount,
        uint256 minBaseReserve,
        uint256 minQuoteReserve
    ) external returns (bool); 


    function _OWNER_() external returns (address);
    
    //========== CrowdPooling ===========

    function createCrowdPooling() external returns (address payable newCrowdPooling);

    function initCrowdPooling(
        address cpAddress,
        address creator,
        address[] memory tokens,
        uint256[] memory timeLine,
        uint256[] memory valueList,
        bool[] memory switches,
        int globalQuota
    ) external;

    function bid(address to) external;
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;


interface IDODOV2Proxy01 {
    function dodoSwapV2ETHToToken(
        address toToken,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool isIncentive,
        uint256 deadLine
    ) external payable returns (uint256 returnAmount);

    function dodoSwapV2TokenToETH(
        address fromToken,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool isIncentive,
        uint256 deadLine
    ) external returns (uint256 returnAmount);

    function dodoSwapV2TokenToToken(
        address fromToken,
        address toToken,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool isIncentive,
        uint256 deadLine
    ) external returns (uint256 returnAmount);

    function createDODOVendingMachine(
        address baseToken,
        address quoteToken,
        uint256 baseInAmount,
        uint256 quoteInAmount,
        uint256 lpFeeRate,
        uint256 i,
        uint256 k,
        bool isOpenTWAP,
        uint256 deadLine
    ) external payable returns (address newVendingMachine, uint256 shares);

    function addDVMLiquidity(
        address dvmAddress,
        uint256 baseInAmount,
        uint256 quoteInAmount,
        uint256 baseMinAmount,
        uint256 quoteMinAmount,
        uint8 flag, //  0 - ERC20, 1 - baseInETH, 2 - quoteInETH
        uint256 deadLine
    )
        external
        payable
        returns (
            uint256 shares,
            uint256 baseAdjustedInAmount,
            uint256 quoteAdjustedInAmount
        );

    // function createDODOPrivatePool(
    //     address baseToken,
    //     address quoteToken,
    //     uint256 baseInAmount,
    //     uint256 quoteInAmount,
    //     uint256 lpFeeRate,
    //     uint256 i,
    //     uint256 k,
    //     bool isOpenTwap,
    //     uint256 deadLine
    // ) external payable returns (address newPrivatePool);

    // function resetDODOPrivatePool(
    //     address dppAddress,
    //     uint256[] memory paramList,  //0 - newLpFeeRate, 1 - newI, 2 - newK
    //     uint256[] memory amountList, //0 - baseInAmount, 1 - quoteInAmount, 2 - baseOutAmount, 3 - quoteOutAmount
    //     uint8 flag, // 0 - ERC20, 1 - baseInETH, 2 - quoteInETH, 3 - baseOutETH, 4 - quoteOutETH
    //     uint256 minBaseReserve,
    //     uint256 minQuoteReserve,
    //     uint256 deadLine
    // ) external payable;


    // function bid(
    //     address cpAddress,
    //     uint256 quoteAmount,
    //     uint8 flag, // 0 - ERC20, 1 - quoteInETH
    //     uint256 deadLine
    // ) external payable;

    function addLiquidityToV1(
        address pair,
        uint256 baseAmount,
        uint256 quoteAmount,
        uint256 baseMinShares,
        uint256 quoteMinShares,
        uint8 flag, // 0 erc20 Out  1 baseInETH  2 quoteInETH 
        uint256 deadLine
    ) external payable returns(uint256, uint256);

    function dodoSwapV1(
        address fromToken,
        address toToken,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        address[] memory dodoPairs,
        uint256 directions,
        bool isIncentive,
        uint256 deadLine
    ) external payable returns (uint256 returnAmount);

    function externalSwap(
        address fromToken,
        address toToken,
        address approveTarget,
        address to,
        uint256 fromTokenAmount,
        uint256 minReturnAmount,
        bytes memory callDataConcat,
        bool isIncentive,
        uint256 deadLine
    ) external payable returns (uint256 returnAmount);

    // function mixSwap(
    //     address fromToken,
    //     address toToken,
    //     uint256 fromTokenAmount,
    //     uint256 minReturnAmount,
    //     address[] memory mixAdapters,
    //     address[] memory mixPairs,
    //     address[] memory assetTo,
    //     uint256 directions,
    //     bool isIncentive,
    //     uint256 deadLine
    // ) external payable returns (uint256 returnAmount);
}

// This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
}

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

interface IUni {
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);

    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;

    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function token0() external view returns (address);
    
    function token1() external view returns (address);
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;


interface IWETH {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address src,
        address dst,
        uint256 wad
    ) external returns (bool);

    function deposit() external payable;

    function withdraw(uint256 wad) external;
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

/**
 * @title Ownable
 * @author DODO Breeder
 *
 * @notice Ownership related functions
 */
contract InitializableOwnable {
    address public _OWNER_;
    address public _NEW_OWNER_;
    bool internal _INITIALIZED_;

    // ============ Events ============

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

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

    // ============ Modifiers ============

    modifier notInitialized() {
        require(!_INITIALIZED_, "DODO_INITIALIZED");
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == _OWNER_, "NOT_OWNER");
        _;
    }

    // ============ Functions ============

    function initOwner(address newOwner) public notInitialized {
        _INITIALIZED_ = true;
        _OWNER_ = newOwner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        emit OwnershipTransferPrepared(_OWNER_, newOwner);
        _NEW_OWNER_ = newOwner;
    }

    function claimOwnership() public {
        require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
        _OWNER_ = _NEW_OWNER_;
        _NEW_OWNER_ = address(0);
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

/**
 * @title ReentrancyGuard
 * @author DODO Breeder
 *
 * @notice Protect functions from Reentrancy Attack
 */
contract ReentrancyGuard {
    // https://solidity.readthedocs.io/en/latest/control-structures.html?highlight=zero-state#scoping-and-declarations
    // zero-state of _ENTERED_ is false
    bool private _ENTERED_;

    modifier preventReentrant() {
        require(!_ENTERED_, "REENTRANT");
        _ENTERED_ = true;
        _;
        _ENTERED_ = false;
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0
    This is a simplified version of OpenZepplin's SafeERC20 library

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

import {IERC20} from "../intf/IERC20.sol";
import {SafeMath} from "./SafeMath.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 ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;

    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)
        );
    }

    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'
        // solhint-disable-next-line max-line-length
        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 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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;


/**
 * @title SafeMath
 * @author DODO Breeder
 *
 * @notice Math operations with safety checks that revert on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "MUL_ERROR");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "DIVIDING_ERROR");
        return a / b;
    }

    function divCeil(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 quotient = div(a, b);
        uint256 remainder = a - quotient * b;
        if (remainder > 0) {
            return quotient + 1;
        } else {
            return quotient;
        }
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SUB_ERROR");
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "ADD_ERROR");
        return c;
    }

    function sqrt(uint256 x) internal pure returns (uint256 y) {
        uint256 z = x / 2 + 1;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;

import {SafeMath} from "../../lib/SafeMath.sol";
import {IERC20} from "../../intf/IERC20.sol";
import {SafeERC20} from "../../lib/SafeERC20.sol";

library UniversalERC20 {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IERC20 private constant ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);

    function universalTransfer(
        IERC20 token,
        address payable to,
        uint256 amount
    ) internal {
        if (amount > 0) {
            if (isETH(token)) {
                to.transfer(amount);
            } else {
                token.safeTransfer(to, amount);
            }
        }
    }

    function universalApproveMax(
        IERC20 token,
        address to,
        uint256 amount
    ) internal {
        uint256 allowance = token.allowance(address(this), to);
        if (allowance < amount) {
            if (allowance > 0) {
                token.safeApprove(to, 0);
            }
            token.safeApprove(to, uint256(-1));
        }
    }

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

    function tokenBalanceOf(IERC20 token, address who) internal view returns (uint256) {
        return token.balanceOf(who);
    }

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

{
  "compilationTarget": {
    "project:/contracts/SmartRoute/DODOV2Proxy02.sol": "DODOV2Proxy02"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}