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// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

/*

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*
* MIT License
* ===========
*
* Copyright (c) 2020 WooTrade
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

import './libraries/InitializableOwnable.sol';
import './libraries/DecimalMath.sol';
import './interfaces/IWooracle.sol';
import './interfaces/IWooPP.sol';
import './interfaces/IWooFeeManager.sol';
import './interfaces/IWooGuardian.sol';
import './interfaces/AggregatorV3Interface.sol';

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';
import '@openzeppelin/contracts/utils/ReentrancyGuard.sol';
import '@openzeppelin/contracts/utils/Pausable.sol';
import '@openzeppelin/contracts/math/SafeMath.sol';
import '@uniswap/lib/contracts/libraries/TransferHelper.sol';

/// @title Woo private pool for swaping.
/// @notice the implementation class for interface IWooPP, mainly for query and swap tokens.
contract WooPP is InitializableOwnable, ReentrancyGuard, Pausable, IWooPP {
    /* ----- Type declarations ----- */

    using SafeMath for uint256;
    using DecimalMath for uint256;
    using SafeERC20 for IERC20;

    /* ----- State variables ----- */

    mapping(address => TokenInfo) public tokenInfo;
    mapping(address => bool) public isStrategist;

    /// @inheritdoc IWooPP
    address public immutable override quoteToken;
    address public wooracle;
    IWooGuardian public wooGuardian;
    IWooFeeManager public feeManager;
    string public pairsInfo; // e.g. BNB/ETH/BTCB/WOO-USDT

    /* ----- Modifiers ----- */

    modifier onlyStrategist() {
        require(msg.sender == _OWNER_ || isStrategist[msg.sender], 'WooPP: NOT_STRATEGIST');
        _;
    }

    constructor(
        address newQuoteToken,
        address newWooracle,
        address newFeeManager,
        address newWooGuardian
    ) public {
        require(newQuoteToken != address(0), 'WooPP: INVALID_QUOTE');
        require(newWooracle != address(0), 'WooPP: newWooracle_ZERO_ADDR');
        require(newFeeManager != address(0), 'WooPP: newFeeManager_ZERO_ADDR');
        require(newWooGuardian != address(0), 'WooPP: newWooGuardian_ZERO_ADDR');

        initOwner(msg.sender);
        quoteToken = newQuoteToken;
        wooracle = newWooracle;
        feeManager = IWooFeeManager(newFeeManager);
        require(feeManager.quoteToken() == newQuoteToken, 'WooPP: feeManager_quoteToken_INVALID');
        wooGuardian = IWooGuardian(newWooGuardian);

        TokenInfo storage quoteInfo = tokenInfo[newQuoteToken];
        quoteInfo.isValid = true;
    }

    /* ----- External Functions ----- */

    /// @inheritdoc IWooPP
    function querySellBase(address baseToken, uint256 baseAmount)
        external
        view
        override
        whenNotPaused
        returns (uint256 quoteAmount)
    {
        require(baseToken != address(0), 'WooPP: baseToken_ZERO_ADDR');
        require(baseToken != quoteToken, 'WooPP: baseToken==quoteToken');
        wooGuardian.checkInputAmount(baseToken, baseAmount);

        TokenInfo memory baseInfo = tokenInfo[baseToken];
        require(baseInfo.isValid, 'WooPP: TOKEN_DOES_NOT_EXIST');
        TokenInfo memory quoteInfo = tokenInfo[quoteToken];
        _autoUpdate(baseToken, baseInfo, quoteInfo);

        quoteAmount = getQuoteAmountSellBase(baseToken, baseAmount, baseInfo, quoteInfo);
        wooGuardian.checkSwapAmount(baseToken, quoteToken, baseAmount, quoteAmount);
        uint256 lpFee = quoteAmount.mulCeil(feeManager.feeRate(baseToken));
        quoteAmount = quoteAmount.sub(lpFee);

        require(quoteAmount <= IERC20(quoteToken).balanceOf(address(this)), 'WooPP: INSUFF_QUOTE');
    }

    /// @inheritdoc IWooPP
    function querySellQuote(address baseToken, uint256 quoteAmount)
        external
        view
        override
        whenNotPaused
        returns (uint256 baseAmount)
    {
        require(baseToken != address(0), 'WooPP: baseToken_ZERO_ADDR');
        require(baseToken != quoteToken, 'WooPP: baseToken==quoteToken');
        wooGuardian.checkInputAmount(quoteToken, quoteAmount);

        TokenInfo memory baseInfo = tokenInfo[baseToken];
        require(baseInfo.isValid, 'WooPP: TOKEN_DOES_NOT_EXIST');
        TokenInfo memory quoteInfo = tokenInfo[quoteToken];
        _autoUpdate(baseToken, baseInfo, quoteInfo);

        uint256 lpFee = quoteAmount.mulCeil(feeManager.feeRate(baseToken));
        quoteAmount = quoteAmount.sub(lpFee);
        baseAmount = getBaseAmountSellQuote(baseToken, quoteAmount, baseInfo, quoteInfo);
        wooGuardian.checkSwapAmount(quoteToken, baseToken, quoteAmount, baseAmount);

        require(baseAmount <= IERC20(baseToken).balanceOf(address(this)), 'WooPP: INSUFF_BASE');
    }

    /// @inheritdoc IWooPP
    function sellBase(
        address baseToken,
        uint256 baseAmount,
        uint256 minQuoteAmount,
        address to,
        address rebateTo
    ) external override nonReentrant whenNotPaused returns (uint256 quoteAmount) {
        require(baseToken != address(0), 'WooPP: baseToken_ZERO_ADDR');
        require(to != address(0), 'WooPP: to_ZERO_ADDR');
        require(baseToken != quoteToken, 'WooPP: baseToken==quoteToken');
        wooGuardian.checkInputAmount(baseToken, baseAmount);

        address from = msg.sender;
        TokenInfo memory baseInfo = tokenInfo[baseToken];
        require(baseInfo.isValid, 'WooPP: TOKEN_DOES_NOT_EXIST');
        TokenInfo memory quoteInfo = tokenInfo[quoteToken];
        _autoUpdate(baseToken, baseInfo, quoteInfo);

        TransferHelper.safeTransferFrom(baseToken, from, address(this), baseAmount);

        quoteAmount = getQuoteAmountSellBase(baseToken, baseAmount, baseInfo, quoteInfo);
        wooGuardian.checkSwapAmount(baseToken, quoteToken, baseAmount, quoteAmount);

        uint256 lpFee = quoteAmount.mulCeil(feeManager.feeRate(baseToken));
        quoteAmount = quoteAmount.sub(lpFee);
        require(quoteAmount >= minQuoteAmount, 'WooPP: quoteAmount<minQuoteAmount');

        TransferHelper.safeApprove(quoteToken, address(feeManager), lpFee);
        feeManager.collectFee(lpFee, rebateTo);

        uint256 balanceBefore = IERC20(quoteToken).balanceOf(to);
        TransferHelper.safeTransfer(quoteToken, to, quoteAmount);
        require(IERC20(quoteToken).balanceOf(to).sub(balanceBefore) >= minQuoteAmount, 'WooPP: INSUFF_OUTPUT_AMOUNT');

        _updateReserve(baseToken, baseInfo, quoteInfo);

        tokenInfo[baseToken] = baseInfo;
        tokenInfo[quoteToken] = quoteInfo;

        emit WooSwap(baseToken, quoteToken, baseAmount, quoteAmount, from, to, rebateTo);
    }

    /// @inheritdoc IWooPP
    function sellQuote(
        address baseToken,
        uint256 quoteAmount,
        uint256 minBaseAmount,
        address to,
        address rebateTo
    ) external override nonReentrant whenNotPaused returns (uint256 baseAmount) {
        require(baseToken != address(0), 'WooPP: baseToken_ZERO_ADDR');
        require(to != address(0), 'WooPP: to_ZERO_ADDR');
        require(baseToken != quoteToken, 'WooPP: baseToken==quoteToken');
        wooGuardian.checkInputAmount(quoteToken, quoteAmount);

        address from = msg.sender;
        TokenInfo memory baseInfo = tokenInfo[baseToken];
        require(baseInfo.isValid, 'WooPP: TOKEN_DOES_NOT_EXIST');
        TokenInfo memory quoteInfo = tokenInfo[quoteToken];
        _autoUpdate(baseToken, baseInfo, quoteInfo);

        TransferHelper.safeTransferFrom(quoteToken, from, address(this), quoteAmount);

        uint256 lpFee = quoteAmount.mulCeil(feeManager.feeRate(baseToken));
        quoteAmount = quoteAmount.sub(lpFee);
        baseAmount = getBaseAmountSellQuote(baseToken, quoteAmount, baseInfo, quoteInfo);
        require(baseAmount >= minBaseAmount, 'WooPP: baseAmount<minBaseAmount');

        TransferHelper.safeApprove(quoteToken, address(feeManager), lpFee);
        feeManager.collectFee(lpFee, rebateTo);

        wooGuardian.checkSwapAmount(quoteToken, baseToken, quoteAmount, baseAmount);

        uint256 balanceBefore = IERC20(baseToken).balanceOf(to);
        TransferHelper.safeTransfer(baseToken, to, baseAmount);
        require(IERC20(baseToken).balanceOf(to).sub(balanceBefore) >= minBaseAmount, 'WooPP: INSUFF_OUTPUT_AMOUNT');

        _updateReserve(baseToken, baseInfo, quoteInfo);

        tokenInfo[baseToken] = baseInfo;
        tokenInfo[quoteToken] = quoteInfo;

        emit WooSwap(quoteToken, baseToken, quoteAmount.add(lpFee), baseAmount, from, to, rebateTo);
    }

    /// @dev Set the pairsInfo
    /// @param newPairsInfo the pairs info to set
    function setPairsInfo(string calldata newPairsInfo) external nonReentrant onlyStrategist {
        pairsInfo = newPairsInfo;
    }

    /// @dev Get the pool's balance of token
    /// @param token the token pool to query
    function poolSize(address token) external view returns (uint256) {
        return IERC20(token).balanceOf(address(this));
    }

    /// @dev Set wooracle from newWooracle
    /// @param newWooracle Wooracle address
    function setWooracle(address newWooracle) external nonReentrant onlyStrategist {
        require(newWooracle != address(0), 'WooPP: newWooracle_ZERO_ADDR');
        wooracle = newWooracle;
        emit WooracleUpdated(newWooracle);
    }

    /// @dev Set wooGuardian from newWooGuardian
    /// @param newWooGuardian WooGuardian address
    function setWooGuardian(address newWooGuardian) external nonReentrant onlyStrategist {
        require(newWooGuardian != address(0), 'WooPP: newWooGuardian_ZERO_ADDR');
        wooGuardian = IWooGuardian(newWooGuardian);
        emit WooGuardianUpdated(newWooGuardian);
    }

    /// @dev Set the feeManager.
    /// @param newFeeManager the fee manager
    function setFeeManager(address newFeeManager) external nonReentrant onlyStrategist {
        require(newFeeManager != address(0), 'WooPP: newFeeManager_ZERO_ADDR');
        feeManager = IWooFeeManager(newFeeManager);
        require(feeManager.quoteToken() == quoteToken, 'WooPP: feeManager_quoteToken_INVALID');
        emit FeeManagerUpdated(newFeeManager);
    }

    /// @dev Add the base token for swap
    /// @param baseToken the base token
    /// @param threshold the balance threshold info
    /// @param R the rebalance refactor
    function addBaseToken(
        address baseToken,
        uint256 threshold,
        uint256 R
    ) external nonReentrant onlyStrategist {
        require(baseToken != address(0), 'WooPP: BASE_TOKEN_ZERO_ADDR');
        require(baseToken != quoteToken, 'WooPP: baseToken==quoteToken');
        require(threshold <= type(uint112).max, 'WooPP: THRESHOLD_OUT_OF_RANGE');
        require(R <= 1e18, 'WooPP: R_OUT_OF_RANGE');

        TokenInfo memory info = tokenInfo[baseToken];
        require(!info.isValid, 'WooPP: TOKEN_ALREADY_EXISTS');

        info.threshold = uint112(threshold);
        info.R = uint64(R);
        info.target = max(info.threshold, info.target);
        info.isValid = true;

        tokenInfo[baseToken] = info;

        emit ParametersUpdated(baseToken, threshold, R);
    }

    /// @dev Remove the base token
    /// @param baseToken the base token
    function removeBaseToken(address baseToken) external nonReentrant onlyStrategist {
        require(baseToken != address(0), 'WooPP: BASE_TOKEN_ZERO_ADDR');
        require(tokenInfo[baseToken].isValid, 'WooPP: TOKEN_DOES_NOT_EXIST');
        delete tokenInfo[baseToken];
        emit ParametersUpdated(baseToken, 0, 0);
    }

    /// @dev Tune the token params
    /// @param token the token to tune
    /// @param newThreshold the new balance threshold info
    /// @param newR the new rebalance refactor
    function tuneParameters(
        address token,
        uint256 newThreshold,
        uint256 newR
    ) external nonReentrant onlyStrategist {
        require(token != address(0), 'WooPP: token_ZERO_ADDR');
        require(newThreshold <= type(uint112).max, 'WooPP: THRESHOLD_OUT_OF_RANGE');
        require(newR <= 1e18, 'WooPP: R>1');

        TokenInfo memory info = tokenInfo[token];
        require(info.isValid, 'WooPP: TOKEN_DOES_NOT_EXIST');

        info.threshold = uint112(newThreshold);
        info.R = uint64(newR);
        info.target = max(info.threshold, info.target);

        tokenInfo[token] = info;
        emit ParametersUpdated(token, newThreshold, newR);
    }

    /* ----- Admin Functions ----- */

    /// @dev Pause the contract.
    function pause() external onlyStrategist {
        super._pause();
    }

    /// @dev Restart the contract.
    function unpause() external onlyStrategist {
        super._unpause();
    }

    /// @dev Update the strategist info.
    /// @param strategist the strategist to set
    /// @param flag true or false
    function setStrategist(address strategist, bool flag) external nonReentrant onlyStrategist {
        require(strategist != address(0), 'WooPP: strategist_ZERO_ADDR');
        isStrategist[strategist] = flag;
        emit StrategistUpdated(strategist, flag);
    }

    /// @dev Withdraw the token.
    /// @param token the token to withdraw
    /// @param to the destination address
    /// @param amount the amount to withdraw
    function withdraw(
        address token,
        address to,
        uint256 amount
    ) public nonReentrant onlyOwner {
        require(token != address(0), 'WooPP: token_ZERO_ADDR');
        require(to != address(0), 'WooPP: to_ZERO_ADDR');
        TransferHelper.safeTransfer(token, to, amount);
        emit Withdraw(token, to, amount);
    }

    function withdrawAll(address token, address to) external onlyOwner {
        withdraw(token, to, IERC20(token).balanceOf(address(this)));
    }

    /// @dev Withdraw the token to the OWNER address
    /// @param token the token
    function withdrawAllToOwner(address token) external nonReentrant onlyStrategist {
        require(token != address(0), 'WooPP: token_ZERO_ADDR');
        uint256 amount = IERC20(token).balanceOf(address(this));
        TransferHelper.safeTransfer(token, _OWNER_, amount);
        emit Withdraw(token, _OWNER_, amount);
    }

    /* ----- Private Functions ----- */

    function _autoUpdate(
        address baseToken,
        TokenInfo memory baseInfo,
        TokenInfo memory quoteInfo
    ) private view {
        require(baseToken != address(0), 'WooPP: BASETOKEN_ZERO_ADDR');
        _updateReserve(baseToken, baseInfo, quoteInfo);

        // NOTE: only consider the least 32 bigs integer number is good engouh
        uint32 priceTimestamp = uint32(IWooracle(wooracle).timestamp());
        if (priceTimestamp != baseInfo.lastResetTimestamp) {
            baseInfo.target = max(baseInfo.threshold, baseInfo.reserve);
            baseInfo.lastResetTimestamp = priceTimestamp;
        }
        if (priceTimestamp != quoteInfo.lastResetTimestamp) {
            quoteInfo.target = max(quoteInfo.threshold, quoteInfo.reserve);
            quoteInfo.lastResetTimestamp = priceTimestamp;
        }
    }

    function _updateReserve(
        address baseToken,
        TokenInfo memory baseInfo,
        TokenInfo memory quoteInfo
    ) private view {
        uint256 baseReserve = IERC20(baseToken).balanceOf(address(this));
        uint256 quoteReserve = IERC20(quoteToken).balanceOf(address(this));
        require(baseReserve <= type(uint112).max);
        require(quoteReserve <= type(uint112).max);
        baseInfo.reserve = uint112(baseReserve);
        quoteInfo.reserve = uint112(quoteReserve);
    }

    // When baseSold >= 0 , users sold the base token
    function getQuoteAmountLowQuoteSide(
        uint256 p,
        uint256 k,
        uint256 r,
        uint256 baseAmount
    ) private pure returns (uint256) {
        // priceFactor = 1 + k * baseAmount * p * r;
        uint256 priceFactor = DecimalMath.ONE.add(k.mulCeil(baseAmount).mulCeil(p).mulCeil(r));
        // return baseAmount * p / priceFactor;
        return baseAmount.mulFloor(p).divFloor(priceFactor); // round down
    }

    // When baseSold >= 0
    function getBaseAmountLowQuoteSide(
        uint256 p,
        uint256 k,
        uint256 r,
        uint256 quoteAmount
    ) private pure returns (uint256) {
        // priceFactor = (1 - k * quoteAmount * r);
        uint256 priceFactor = DecimalMath.ONE.sub(k.mulFloor(quoteAmount).mulFloor(r));
        // return quoteAmount / p / priceFactor;
        return quoteAmount.divFloor(p).divFloor(priceFactor);
    }

    // When quoteSold >= 0
    function getBaseAmountLowBaseSide(
        uint256 p,
        uint256 k,
        uint256 r,
        uint256 quoteAmount
    ) private pure returns (uint256) {
        // priceFactor = 1 + k * quoteAmount * r;
        uint256 priceFactor = DecimalMath.ONE.add(k.mulCeil(quoteAmount).mulCeil(r));
        // return quoteAmount / p / priceFactor;
        return quoteAmount.divFloor(p).divFloor(priceFactor); // round down
    }

    // When quoteSold >= 0
    function getQuoteAmountLowBaseSide(
        uint256 p,
        uint256 k,
        uint256 r,
        uint256 baseAmount
    ) private pure returns (uint256) {
        // priceFactor = 1 - k * baseAmount * p * r;
        uint256 priceFactor = DecimalMath.ONE.sub(k.mulFloor(baseAmount).mulFloor(p).mulFloor(r));
        // return baseAmount * p / priceFactor;
        return baseAmount.mulFloor(p).divFloor(priceFactor); // round down
    }

    function getBoughtAmount(
        TokenInfo memory baseInfo,
        TokenInfo memory quoteInfo,
        uint256 p,
        uint256 k,
        bool isSellBase
    ) private pure returns (uint256 baseBought, uint256 quoteBought) {
        uint256 baseSold = 0;
        if (baseInfo.reserve < baseInfo.target) {
            baseBought = uint256(baseInfo.target).sub(uint256(baseInfo.reserve));
        } else {
            baseSold = uint256(baseInfo.reserve).sub(uint256(baseInfo.target));
        }
        uint256 quoteSold = 0;
        if (quoteInfo.reserve < quoteInfo.target) {
            quoteBought = uint256(quoteInfo.target).sub(uint256(quoteInfo.reserve));
        } else {
            quoteSold = uint256(quoteInfo.reserve).sub(uint256(quoteInfo.target));
        }

        if (baseSold.mulCeil(p) > quoteSold) {
            baseSold = baseSold.sub(quoteSold.divFloor(p));
            quoteSold = 0;
        } else {
            quoteSold = quoteSold.sub(baseSold.mulCeil(p));
            baseSold = 0;
        }

        uint256 virtualBaseBought = getBaseAmountLowBaseSide(p, k, DecimalMath.ONE, quoteSold);
        if (isSellBase == (virtualBaseBought < baseBought)) {
            baseBought = virtualBaseBought;
        }
        uint256 virtualQuoteBought = getQuoteAmountLowQuoteSide(p, k, DecimalMath.ONE, baseSold);
        if (isSellBase == (virtualQuoteBought > quoteBought)) {
            quoteBought = virtualQuoteBought;
        }
    }

    function getQuoteAmountSellBase(
        address baseToken,
        uint256 baseAmount,
        TokenInfo memory baseInfo,
        TokenInfo memory quoteInfo
    ) private view returns (uint256 quoteAmount) {
        uint256 p;
        uint256 s;
        uint256 k;
        bool isFeasible;
        (p, s, k, isFeasible) = IWooracle(wooracle).state(baseToken);
        require(isFeasible, 'WooPP: ORACLE_PRICE_NOT_FEASIBLE');

        wooGuardian.checkSwapPrice(p, baseToken, quoteToken);

        // price: p * (1 - s / 2)
        p = p.mulFloor(DecimalMath.ONE.sub(s.divCeil(DecimalMath.TWO)));

        uint256 baseBought;
        uint256 quoteBought;
        (baseBought, quoteBought) = getBoughtAmount(baseInfo, quoteInfo, p, k, true);

        if (baseBought > 0) {
            uint256 quoteSold = getQuoteAmountLowBaseSide(p, k, baseInfo.R, baseBought);
            if (baseAmount > baseBought) {
                uint256 newBaseSold = baseAmount.sub(baseBought);
                quoteAmount = quoteSold.add(getQuoteAmountLowQuoteSide(p, k, DecimalMath.ONE, newBaseSold));
            } else {
                uint256 newBaseBought = baseBought.sub(baseAmount);
                quoteAmount = quoteSold.sub(getQuoteAmountLowBaseSide(p, k, baseInfo.R, newBaseBought));
            }
        } else {
            uint256 baseSold = getBaseAmountLowQuoteSide(p, k, DecimalMath.ONE, quoteBought);
            uint256 newBaseSold = baseAmount.add(baseSold);
            uint256 newQuoteBought = getQuoteAmountLowQuoteSide(p, k, DecimalMath.ONE, newBaseSold);
            quoteAmount = newQuoteBought > quoteBought ? newQuoteBought.sub(quoteBought) : 0;
        }
    }

    function getBaseAmountSellQuote(
        address baseToken,
        uint256 quoteAmount,
        TokenInfo memory baseInfo,
        TokenInfo memory quoteInfo
    ) private view returns (uint256 baseAmount) {
        uint256 p;
        uint256 s;
        uint256 k;
        bool isFeasible;
        (p, s, k, isFeasible) = IWooracle(wooracle).state(baseToken);
        require(isFeasible, 'WooPP: ORACLE_PRICE_NOT_FEASIBLE');

        wooGuardian.checkSwapPrice(p, baseToken, quoteToken);

        // price: p * (1 + s / 2)
        p = p.mulCeil(DecimalMath.ONE.add(s.divCeil(DecimalMath.TWO)));

        uint256 baseBought;
        uint256 quoteBought;
        (baseBought, quoteBought) = getBoughtAmount(baseInfo, quoteInfo, p, k, false);

        if (quoteBought > 0) {
            uint256 baseSold = getBaseAmountLowQuoteSide(p, k, baseInfo.R, quoteBought);
            if (quoteAmount > quoteBought) {
                uint256 newQuoteSold = quoteAmount.sub(quoteBought);
                baseAmount = baseSold.add(getBaseAmountLowBaseSide(p, k, DecimalMath.ONE, newQuoteSold));
            } else {
                uint256 newQuoteBought = quoteBought.sub(quoteAmount);
                baseAmount = baseSold.sub(getBaseAmountLowQuoteSide(p, k, baseInfo.R, newQuoteBought));
            }
        } else {
            uint256 quoteSold = getQuoteAmountLowBaseSide(p, k, DecimalMath.ONE, baseBought);
            uint256 newQuoteSold = quoteAmount.add(quoteSold);
            uint256 newBaseBought = getBaseAmountLowBaseSide(p, k, DecimalMath.ONE, newQuoteSold);
            baseAmount = newBaseBought > baseBought ? newBaseBought.sub(baseBought) : 0;
        }
    }

    function max(uint112 a, uint112 b) private pure returns (uint112) {
        return a >= b ? a : b;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

/**
 * @title Ownable initializable contract.
 *
 * @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_, 'InitializableOwnable: SHOULD_NOT_BE_INITIALIZED');
        _;
    }

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

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

    /// @dev Init _OWNER_ from newOwner and set _INITIALIZED_ as true
    /// @param newOwner new owner address
    function initOwner(address newOwner) public notInitialized {
        _INITIALIZED_ = true;
        _OWNER_ = newOwner;
    }

    /// @dev Set _NEW_OWNER_ from newOwner
    /// @param newOwner new owner address
    function transferOwnership(address newOwner) public onlyOwner {
        emit OwnershipTransferPrepared(_OWNER_, newOwner);
        _NEW_OWNER_ = newOwner;
    }

    /// @dev Set _OWNER_ from _NEW_OWNER_ and set _NEW_OWNER_ equal zero address
    function claimOwnership() public {
        require(msg.sender == _NEW_OWNER_, 'InitializableOwnable: INVALID_CLAIM');
        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
        _OWNER_ = _NEW_OWNER_;
        _NEW_OWNER_ = address(0);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

import '@openzeppelin/contracts/math/SafeMath.sol';

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

    uint256 internal constant ONE = 10**18;
    uint256 internal constant TWO = 2 * 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 _divCeil(target.mul(d), 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 _divCeil(target.mul(10**18), d);
    }

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

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

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

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

/*

░██╗░░░░░░░██╗░█████╗░░█████╗░░░░░░░███████╗██╗
░██║░░██╗░░██║██╔══██╗██╔══██╗░░░░░░██╔════╝██║
░╚██╗████╗██╔╝██║░░██║██║░░██║█████╗█████╗░░██║
░░████╔═████║░██║░░██║██║░░██║╚════╝██╔══╝░░██║
░░╚██╔╝░╚██╔╝░╚█████╔╝╚█████╔╝░░░░░░██║░░░░░██║
░░░╚═╝░░░╚═╝░░░╚════╝░░╚════╝░░░░░░░╚═╝░░░░░╚═╝

*
* MIT License
* ===========
*
* Copyright (c) 2020 WooTrade
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/// @title The oracle interface by Woo.Network.
/// @notice update and posted the latest price info by Woo.
interface IWooracle {
    /// @dev the quote token for Wooracle's pricing.
    /// @return the quote token
    function quoteToken() external view returns (address);

    /// @dev the price for the given base token
    /// @param base baseToken address
    /// @return priceNow the current price of base token
    /// @return feasible whether the current price is feasible and valid
    function price(address base) external view returns (uint256 priceNow, bool feasible);

    function getPrice(address base) external view returns (uint256);

    function getSpread(address base) external view returns (uint256);

    function getCoeff(address base) external view returns (uint256);

    /// @dev returns the state for the given base token.
    /// @param base baseToken address
    /// @return priceNow the current price of base token
    /// @return spreadNow the current spread of base token
    /// @return coeffNow the slippage coefficient of base token
    /// @return feasible whether the current state is feasible and valid
    function state(address base)
        external
        view
        returns (
            uint256 priceNow,
            uint256 spreadNow,
            uint256 coeffNow,
            bool feasible
        );

    /// @dev returns the last updated timestamp
    /// @return the last updated timestamp
    function timestamp() external view returns (uint256);

    /// @dev returns whether the base token price is valid.
    /// @param base baseToken address
    /// @return whether the base token price is valid.
    function isFeasible(address base) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

/*

░██╗░░░░░░░██╗░█████╗░░█████╗░░░░░░░███████╗██╗
░██║░░██╗░░██║██╔══██╗██╔══██╗░░░░░░██╔════╝██║
░╚██╗████╗██╔╝██║░░██║██║░░██║█████╗█████╗░░██║
░░████╔═████║░██║░░██║██║░░██║╚════╝██╔══╝░░██║
░░╚██╔╝░╚██╔╝░╚█████╔╝╚█████╔╝░░░░░░██║░░░░░██║
░░░╚═╝░░░╚═╝░░░╚════╝░░╚════╝░░░░░░░╚═╝░░░░░╚═╝

*
* MIT License
* ===========
*
* Copyright (c) 2020 WooTrade
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/// @title Woo private pool for swap.
/// @notice Use this contract to directly interfact with woo's synthetic proactive
///         marketing making pool.
/// @author woo.network
interface IWooPP {
    /* ----- Type declarations ----- */

    /// @dev struct info to store the token info
    struct TokenInfo {
        uint112 reserve; // Token balance
        uint112 threshold; // Threshold for reserve update
        uint32 lastResetTimestamp; // Timestamp for last param update
        uint64 R; // Rebalance coefficient [0, 1]
        uint112 target; // Targeted balance for pricing
        bool isValid; // is this token info valid
    }

    /* ----- Events ----- */

    event StrategistUpdated(address indexed strategist, bool flag);
    event FeeManagerUpdated(address indexed newFeeManager);
    event RewardManagerUpdated(address indexed newRewardManager);
    event WooracleUpdated(address indexed newWooracle);
    event WooGuardianUpdated(address indexed newWooGuardian);
    event ParametersUpdated(address indexed baseToken, uint256 newThreshold, uint256 newR);
    event Withdraw(address indexed token, address indexed to, uint256 amount);
    event WooSwap(
        address indexed fromToken,
        address indexed toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address from,
        address indexed to,
        address rebateTo
    );

    /* ----- External Functions ----- */

    /// @dev Swap baseToken into quoteToken
    /// @param baseToken the base token
    /// @param baseAmount amount of baseToken that user want to swap
    /// @param minQuoteAmount minimum amount of quoteToken that user accept to receive
    /// @param to quoteToken receiver address
    /// @param rebateTo the wallet address for rebate
    /// @return quoteAmount the swapped amount of quote token
    function sellBase(
        address baseToken,
        uint256 baseAmount,
        uint256 minQuoteAmount,
        address to,
        address rebateTo
    ) external returns (uint256 quoteAmount);

    /// @dev Swap quoteToken into baseToken
    /// @param baseToken the base token
    /// @param quoteAmount amount of quoteToken that user want to swap
    /// @param minBaseAmount minimum amount of baseToken that user accept to receive
    /// @param to baseToken receiver address
    /// @param rebateTo the wallet address for rebate
    /// @return baseAmount the swapped amount of base token
    function sellQuote(
        address baseToken,
        uint256 quoteAmount,
        uint256 minBaseAmount,
        address to,
        address rebateTo
    ) external returns (uint256 baseAmount);

    /// @dev Query the amount for selling the base token amount.
    /// @param baseToken the base token to sell
    /// @param baseAmount the amount to sell
    /// @return quoteAmount the swapped quote amount
    function querySellBase(address baseToken, uint256 baseAmount) external view returns (uint256 quoteAmount);

    /// @dev Query the amount for selling the quote token.
    /// @param baseToken the base token to receive (buy)
    /// @param quoteAmount the amount to sell
    /// @return baseAmount the swapped base token amount
    function querySellQuote(address baseToken, uint256 quoteAmount) external view returns (uint256 baseAmount);

    /// @dev get the quote token address
    /// @return address of quote token
    function quoteToken() external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

/*

░██╗░░░░░░░██╗░█████╗░░█████╗░░░░░░░███████╗██╗
░██║░░██╗░░██║██╔══██╗██╔══██╗░░░░░░██╔════╝██║
░╚██╗████╗██╔╝██║░░██║██║░░██║█████╗█████╗░░██║
░░████╔═████║░██║░░██║██║░░██║╚════╝██╔══╝░░██║
░░╚██╔╝░╚██╔╝░╚█████╔╝╚█████╔╝░░░░░░██║░░░░░██║
░░░╚═╝░░░╚═╝░░░╚════╝░░╚════╝░░░░░░░╚═╝░░░░░╚═╝

*
* MIT License
* ===========
*
* Copyright (c) 2020 WooTrade
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/// @title Contract to collect transaction fee of Woo private pool.
interface IWooFeeManager {
    /* ----- Events ----- */

    event FeeRateUpdated(address indexed token, uint256 newFeeRate);
    event Withdraw(address indexed token, address indexed to, uint256 amount);

    /* ----- External Functions ----- */

    /// @dev fee rate for the given base token:
    /// NOTE: fee rate decimal 18: 1e16 = 1%, 1e15 = 0.1%, 1e14 = 0.01%
    /// @param token the base token
    /// @return the fee rate
    function feeRate(address token) external view returns (uint256);

    /// @dev Sets the fee rate for the given token
    /// @param token the base token
    /// @param newFeeRate the new fee rate
    function setFeeRate(address token, uint256 newFeeRate) external;

    /// @dev Collects the swap fee to the given brokder address.
    /// @param amount the swap fee amount
    /// @param brokerAddr the broker address to rebate to
    function collectFee(uint256 amount, address brokerAddr) external;

    /// @dev get the quote token address
    /// @return address of quote token
    function quoteToken() external view returns (address);

    /// @dev Collects the fee and distribute to rebate and vault managers.
    function distributeFees() external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

/*

░██╗░░░░░░░██╗░█████╗░░█████╗░░░░░░░███████╗██╗
░██║░░██╗░░██║██╔══██╗██╔══██╗░░░░░░██╔════╝██║
░╚██╗████╗██╔╝██║░░██║██║░░██║█████╗█████╗░░██║
░░████╔═████║░██║░░██║██║░░██║╚════╝██╔══╝░░██║
░░╚██╔╝░╚██╔╝░╚█████╔╝╚█████╔╝░░░░░░██║░░░░░██║
░░░╚═╝░░░╚═╝░░░╚════╝░░╚════╝░░░░░░░╚═╝░░░░░╚═╝

*
* MIT License
* ===========
*
* Copyright (c) 2020 WooTrade
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

import '../interfaces/IWooPP.sol';

/// @title Guardian interface to ensure the trading price and volume correct
interface IWooGuardian {
    event ChainlinkRefOracleUpdated(address indexed token, address indexed chainlinkRefOracle);

    /* ----- Main check APIs ----- */

    function checkSwapPrice(
        uint256 price,
        address fromToken,
        address toToken
    ) external view;

    function checkInputAmount(address token, uint256 inputAmount) external view;

    function checkSwapAmount(
        address fromToken,
        address toToken,
        uint256 fromAmount,
        uint256 toAmount
    ) external view;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.6.12;
pragma experimental ABIEncoderV2;

interface AggregatorV3Interface {
    function decimals() external view returns (uint8);

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

    function version() external view returns (uint256);

    /// getRoundData and latestRoundData should both raise "No data present"
    /// if they do not have data to report, instead of returning unset values
    /// which could be misinterpreted as actual reported values.
    function getRoundData(uint80 _roundId)
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `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);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

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

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

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

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

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

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

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

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

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

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // 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));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"newQuoteToken","type":"address"},{"internalType":"address","name":"newWooracle","type":"address"},{"internalType":"address","name":"newFeeManager","type":"address"},{"internalType":"address","name":"newWooGuardian","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newFeeManager","type":"address"}],"name":"FeeManagerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferPrepared","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"baseToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"newThreshold","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newR","type":"uint256"}],"name":"ParametersUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newRewardManager","type":"address"}],"name":"RewardManagerUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"strategist","type":"address"},{"indexed":false,"internalType":"bool","name":"flag","type":"bool"}],"name":"StrategistUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newWooGuardian","type":"address"}],"name":"WooGuardianUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"fromToken","type":"address"},{"indexed":true,"internalType":"address","name":"toToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"fromAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"toAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"address","name":"rebateTo","type":"address"}],"name":"WooSwap","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newWooracle","type":"address"}],"name":"WooracleUpdated","type":"event"},{"inputs":[],"name":"_NEW_OWNER_","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_OWNER_","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"uint256","name":"threshold","type":"uint256"},{"internalType":"uint256","name":"R","type":"uint256"}],"name":"addBaseToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claimOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeManager","outputs":[{"internalType":"contract IWooFeeManager","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"initOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isStrategist","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pairsInfo","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"poolSize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"uint256","name":"baseAmount","type":"uint256"}],"name":"querySellBase","outputs":[{"internalType":"uint256","name":"quoteAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"uint256","name":"quoteAmount","type":"uint256"}],"name":"querySellQuote","outputs":[{"internalType":"uint256","name":"baseAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"quoteToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"}],"name":"removeBaseToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"uint256","name":"baseAmount","type":"uint256"},{"internalType":"uint256","name":"minQuoteAmount","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"address","name":"rebateTo","type":"address"}],"name":"sellBase","outputs":[{"internalType":"uint256","name":"quoteAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"baseToken","type":"address"},{"internalType":"uint256","name":"quoteAmount","type":"uint256"},{"internalType":"uint256","name":"minBaseAmount","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"address","name":"rebateTo","type":"address"}],"name":"sellQuote","outputs":[{"internalType":"uint256","name":"baseAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newFeeManager","type":"address"}],"name":"setFeeManager","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"newPairsInfo","type":"string"}],"name":"setPairsInfo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"strategist","type":"address"},{"internalType":"bool","name":"flag","type":"bool"}],"name":"setStrategist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newWooGuardian","type":"address"}],"name":"setWooGuardian","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newWooracle","type":"address"}],"name":"setWooracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenInfo","outputs":[{"internalType":"uint112","name":"reserve","type":"uint112"},{"internalType":"uint112","name":"threshold","type":"uint112"},{"internalType":"uint32","name":"lastResetTimestamp","type":"uint32"},{"internalType":"uint64","name":"R","type":"uint64"},{"internalType":"uint112","name":"target","type":"uint112"},{"internalType":"bool","name":"isValid","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"newThreshold","type":"uint256"},{"internalType":"uint256","name":"newR","type":"uint256"}],"name":"tuneParameters","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"}],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"withdrawAllToOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"wooGuardian","outputs":[{"internalType":"contract IWooGuardian","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wooracle","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000004068da6c83afcfa0e13ba15a6696662335d5b75000000000000000000000000209102c0d2e34282494114ea76d5251c8e7ea7ab000000000000000000000000be1a0fcccfa9c9065152b7770b918f7c59914e8d000000000000000000000000128758d0e909624841ab29d53919646bfbda5db2

-----Decoded View---------------
Arg [0] : newQuoteToken (address): 0x04068DA6C83AFCFA0e13ba15A6696662335D5B75
Arg [1] : newWooracle (address): 0x209102c0D2E34282494114ea76D5251c8e7Ea7ab
Arg [2] : newFeeManager (address): 0xBE1a0FccCFA9c9065152B7770B918f7C59914E8D
Arg [3] : newWooGuardian (address): 0x128758d0e909624841AB29D53919646BFBDa5dB2

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 00000000000000000000000004068da6c83afcfa0e13ba15a6696662335d5b75
Arg [1] : 000000000000000000000000209102c0d2e34282494114ea76d5251c8e7ea7ab
Arg [2] : 000000000000000000000000be1a0fcccfa9c9065152b7770b918f7c59914e8d
Arg [3] : 000000000000000000000000128758d0e909624841ab29d53919646bfbda5db2