// File: contracts/access/Governable.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

contract Governable {
    address public gov;

    constructor() public {
        gov = msg.sender;
    }

    modifier onlyGov() {
        require(msg.sender == gov, "Governable: forbidden");
        _;
    }

    function setGov(address _gov) external onlyGov {
        gov = _gov;
    }
}

// File: contracts/core/BasePositionManager.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../libraries/math/SafeMath.sol";
import "../libraries/token/IERC20.sol";
import "../tokens/interfaces/IWETH.sol";
import "../libraries/token/SafeERC20.sol";
import "../libraries/utils/Address.sol";
import "../libraries/utils/ReentrancyGuard.sol";

import "./interfaces/IRouter.sol";
import "./interfaces/IVault.sol";
import "./interfaces/IShortsTracker.sol";
import "./interfaces/IOrderBook.sol";
import "./interfaces/IBasePositionManager.sol";

import "../access/Governable.sol";
import "../peripherals/interfaces/ITimelock.sol";

import "../referrals/interfaces/IReferralStorage.sol";

contract BasePositionManager is IBasePositionManager, ReentrancyGuard, Governable {

    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address payable;

    uint256 public constant BASIS_POINTS_DIVISOR = 10000;

    address public admin;

    address public vault;
    address public shortsTracker;
    address public router;
    address public weth;

    // to prevent using the deposit and withdrawal of collateral as a zero fee swap,
    // there is a small depositFee charged if a collateral deposit results in the decrease
    // of leverage for an existing position
    // increasePositionBufferBps allows for a small amount of decrease of leverage
    uint256 public depositFee;
    uint256 public increasePositionBufferBps = 100;

    address public referralStorage;

    mapping (address => uint256) public feeReserves;

    mapping (address => uint256) public override maxGlobalLongSizes;
    mapping (address => uint256) public override maxGlobalShortSizes;

    event SetDepositFee(uint256 depositFee);
    event SetIncreasePositionBufferBps(uint256 increasePositionBufferBps);
    event SetReferralStorage(address referralStorage);
    event SetAdmin(address admin);
    event WithdrawFees(address token, address receiver, uint256 amount);

    event SetMaxGlobalSizes(
        address[] tokens,
        uint256[] longSizes,
        uint256[] shortSizes
    );

    event IncreasePositionReferral(
        address account,
        uint256 sizeDelta,
        uint256 marginFeeBasisPoints,
        bytes32 referralCode,
        address referrer
    );

    event DecreasePositionReferral(
        address account,
        uint256 sizeDelta,
        uint256 marginFeeBasisPoints,
        bytes32 referralCode,
        address referrer
    );

    modifier onlyAdmin() {
        require(msg.sender == admin, "BasePositionManager: forbidden");
        _;
    }

    constructor(
        address _vault,
        address _router,
        address _shortsTracker,
        address _weth,
        uint256 _depositFee
    ) public {
        vault = _vault;
        router = _router;
        weth = _weth;
        depositFee = _depositFee;
        shortsTracker = _shortsTracker;

        admin = msg.sender;
    }

    receive() external payable {
        require(msg.sender == weth, "BasePositionManager: invalid sender");
    }

    function setAdmin(address _admin) external onlyGov {
        admin = _admin;
        emit SetAdmin(_admin);
    }

    function setDepositFee(uint256 _depositFee) external onlyAdmin {
        depositFee = _depositFee;
        emit SetDepositFee(_depositFee);
    }

    function setIncreasePositionBufferBps(uint256 _increasePositionBufferBps) external onlyAdmin {
        increasePositionBufferBps = _increasePositionBufferBps;
        emit SetIncreasePositionBufferBps(_increasePositionBufferBps);
    }

    function setReferralStorage(address _referralStorage) external onlyAdmin {
        referralStorage = _referralStorage;
        emit SetReferralStorage(_referralStorage);
    }

    function setMaxGlobalSizes(
        address[] memory _tokens,
        uint256[] memory _longSizes,
        uint256[] memory _shortSizes
    ) external onlyAdmin {
        for (uint256 i = 0; i < _tokens.length; i++) {
            address token = _tokens[i];
            maxGlobalLongSizes[token] = _longSizes[i];
            maxGlobalShortSizes[token] = _shortSizes[i];
        }

        emit SetMaxGlobalSizes(_tokens, _longSizes, _shortSizes);
    }

    function withdrawFees(address _token, address _receiver) external onlyAdmin {
        uint256 amount = feeReserves[_token];
        if (amount == 0) { return; }

        feeReserves[_token] = 0;
        IERC20(_token).safeTransfer(_receiver, amount);

        emit WithdrawFees(_token, _receiver, amount);
    }

    function approve(address _token, address _spender, uint256 _amount) external onlyGov {
        IERC20(_token).approve(_spender, _amount);
    }

    function sendValue(address payable _receiver, uint256 _amount) external onlyGov {
        _receiver.sendValue(_amount);
    }

    function _validateMaxGlobalSize(address _indexToken, bool _isLong, uint256 _sizeDelta) internal view {
        if (_sizeDelta == 0) {
            return;
        }

        if (_isLong) {
            uint256 maxGlobalLongSize = maxGlobalLongSizes[_indexToken];
            if (maxGlobalLongSize > 0 && IVault(vault).guaranteedUsd(_indexToken).add(_sizeDelta) > maxGlobalLongSize) {
                revert("BasePositionManager: max global longs exceeded");
            }
        } else {
            uint256 maxGlobalShortSize = maxGlobalShortSizes[_indexToken];
            if (maxGlobalShortSize > 0 && IVault(vault).globalShortSizes(_indexToken).add(_sizeDelta) > maxGlobalShortSize) {
                revert("BasePositionManager: max global shorts exceeded");
            }
        }
    }

    function _increasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong, uint256 _price) internal {
        address _vault = vault;

        uint256 markPrice = _isLong ? IVault(_vault).getMaxPrice(_indexToken) : IVault(_vault).getMinPrice(_indexToken);
        if (_isLong) {
            require(markPrice <= _price, "BasePositionManager: mark price higher than limit");
        } else {
            require(markPrice >= _price, "BasePositionManager: mark price lower than limit");
        }

        _validateMaxGlobalSize(_indexToken, _isLong, _sizeDelta);

        address timelock = IVault(_vault).gov();

        // should be called strictly before position is updated in Vault
        IShortsTracker(shortsTracker).updateGlobalShortData(_account, _collateralToken, _indexToken, _isLong, _sizeDelta, markPrice, true);

        ITimelock(timelock).enableLeverage(_vault);
        IRouter(router).pluginIncreasePosition(_account, _collateralToken, _indexToken, _sizeDelta, _isLong);
        ITimelock(timelock).disableLeverage(_vault);

        _emitIncreasePositionReferral(_account, _sizeDelta);
    }

    function _decreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver, uint256 _price) internal returns (uint256) {
        address _vault = vault;

        uint256 markPrice = _isLong ? IVault(_vault).getMinPrice(_indexToken) : IVault(_vault).getMaxPrice(_indexToken);
        if (_isLong) {
            require(markPrice >= _price, "BasePositionManager: mark price lower than limit");
        } else {
            require(markPrice <= _price, "BasePositionManager: mark price higher than limit");
        }

        address timelock = IVault(_vault).gov();

        // should be called strictly before position is updated in Vault
        IShortsTracker(shortsTracker).updateGlobalShortData(_account, _collateralToken, _indexToken, _isLong, _sizeDelta, markPrice, false);

        ITimelock(timelock).enableLeverage(_vault);
        uint256 amountOut = IRouter(router).pluginDecreasePosition(_account, _collateralToken, _indexToken, _collateralDelta, _sizeDelta, _isLong, _receiver);
        ITimelock(timelock).disableLeverage(_vault);

        _emitDecreasePositionReferral(_account, _sizeDelta);

        return amountOut;
    }

    function _emitIncreasePositionReferral(address _account, uint256 _sizeDelta) internal {
        address _referralStorage = referralStorage;
        if (_referralStorage == address(0)) {
            return;
        }

        (bytes32 referralCode, address referrer) = IReferralStorage(_referralStorage).getTraderReferralInfo(_account);
        emit IncreasePositionReferral(
            _account,
            _sizeDelta,
            IVault(vault).marginFeeBasisPoints(),
            referralCode,
            referrer
        );
    }

    function _emitDecreasePositionReferral(address _account, uint256 _sizeDelta) internal {
        address _referralStorage = referralStorage;
        if (_referralStorage == address(0)) {
            return;
        }

        (bytes32 referralCode, address referrer) = IReferralStorage(_referralStorage).getTraderReferralInfo(_account);

        if (referralCode == bytes32(0)) {
            return;
        }

        emit DecreasePositionReferral(
            _account,
            _sizeDelta,
            IVault(vault).marginFeeBasisPoints(),
            referralCode,
            referrer
        );
    }

    function _swap(address[] memory _path, uint256 _minOut, address _receiver) internal returns (uint256) {
        if (_path.length == 2) {
            return _vaultSwap(_path[0], _path[1], _minOut, _receiver);
        }
        revert("BasePositionManager: invalid _path.length");
    }

    function _vaultSwap(address _tokenIn, address _tokenOut, uint256 _minOut, address _receiver) internal returns (uint256) {
        uint256 amountOut = IVault(vault).swap(_tokenIn, _tokenOut, _receiver);
        require(amountOut >= _minOut, "BasePositionManager: insufficient amountOut");
        return amountOut;
    }

    function _transferInETH() internal {
        if (msg.value != 0) {
            IWETH(weth).deposit{value: msg.value}();
        }
    }

    function _transferOutETHWithGasLimitIgnoreFail(uint256 _amountOut, address payable _receiver) internal {
        IWETH(weth).withdraw(_amountOut);

        // use `send` instead of `transfer` to not revert whole transaction in case ETH transfer was failed
        // it has limit of 2300 gas
        // this is to avoid front-running
        _receiver.send(_amountOut);
    }

    function _collectFees(
        address _account,
        address[] memory _path,
        uint256 _amountIn,
        address _indexToken,
        bool _isLong,
        uint256 _sizeDelta
    ) internal returns (uint256) {
        bool shouldDeductFee = _shouldDeductFee(
            _account,
            _path,
            _amountIn,
            _indexToken,
            _isLong,
            _sizeDelta
        );

        if (shouldDeductFee) {
            uint256 afterFeeAmount = _amountIn.mul(BASIS_POINTS_DIVISOR.sub(depositFee)).div(BASIS_POINTS_DIVISOR);
            uint256 feeAmount = _amountIn.sub(afterFeeAmount);
            address feeToken = _path[_path.length - 1];
            feeReserves[feeToken] = feeReserves[feeToken].add(feeAmount);
            return afterFeeAmount;
        }

        return _amountIn;
    }

    function _shouldDeductFee(
        address _account,
        address[] memory _path,
        uint256 _amountIn,
        address _indexToken,
        bool _isLong,
        uint256 _sizeDelta
    ) internal view returns (bool) {
        // if the position is a short, do not charge a fee
        if (!_isLong) { return false; }

        // if the position size is not increasing, this is a collateral deposit
        if (_sizeDelta == 0) { return true; }

        address collateralToken = _path[_path.length - 1];

        IVault _vault = IVault(vault);
        (uint256 size, uint256 collateral, , , , , , ) = _vault.getPosition(_account, collateralToken, _indexToken, _isLong);

        // if there is no existing position, do not charge a fee
        if (size == 0) { return false; }

        uint256 nextSize = size.add(_sizeDelta);
        uint256 collateralDelta = _vault.tokenToUsdMin(collateralToken, _amountIn);
        uint256 nextCollateral = collateral.add(collateralDelta);

        uint256 prevLeverage = size.mul(BASIS_POINTS_DIVISOR).div(collateral);
        // allow for a maximum of a increasePositionBufferBps decrease since there might be some swap fees taken from the collateral
        uint256 nextLeverage = nextSize.mul(BASIS_POINTS_DIVISOR + increasePositionBufferBps).div(nextCollateral);

        // deduct a fee if the leverage is decreased
        return nextLeverage < prevLeverage;
    }
}

// File: contracts/core/interfaces/IBasePositionManager.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IBasePositionManager {
    function maxGlobalLongSizes(address _token) external view returns (uint256);
    function maxGlobalShortSizes(address _token) external view returns (uint256);
}

// File: contracts/core/interfaces/IOrderBook.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IOrderBook {
	function getSwapOrder(address _account, uint256 _orderIndex) external view returns (
        address path0, 
        address path1,
        address path2,
        uint256 amountIn,
        uint256 minOut,
        uint256 triggerRatio,
        bool triggerAboveThreshold,
        bool shouldUnwrap,
        uint256 executionFee
    );

    function getIncreaseOrder(address _account, uint256 _orderIndex) external view returns (
        address purchaseToken, 
        uint256 purchaseTokenAmount,
        address collateralToken,
        address indexToken,
        uint256 sizeDelta,
        bool isLong,
        uint256 triggerPrice,
        bool triggerAboveThreshold,
        uint256 executionFee
    );

    function getDecreaseOrder(address _account, uint256 _orderIndex) external view returns (
        address collateralToken,
        uint256 collateralDelta,
        address indexToken,
        uint256 sizeDelta,
        bool isLong,
        uint256 triggerPrice,
        bool triggerAboveThreshold,
        uint256 executionFee
    );

    function executeSwapOrder(address, uint256, address payable) external;
    function executeDecreaseOrder(address, uint256, address payable) external;
    function executeIncreaseOrder(address, uint256, address payable) external;
}

// File: contracts/core/interfaces/IPositionRouter.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IPositionRouter {
    function increasePositionRequestKeysStart() external returns (uint256);
    function decreasePositionRequestKeysStart() external returns (uint256);
    // function executeIncreasePositions(uint256 _count, address payable _executionFeeReceiver) external;
    // function executeDecreasePositions(uint256 _count, address payable _executionFeeReceiver) external;
}

// File: contracts/core/interfaces/IPositionRouterCallbackReceiver.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

interface IPositionRouterCallbackReceiver {
    function gmxPositionCallback(bytes32 positionKey, bool isExecuted, bool isIncrease) external;
}

// File: contracts/core/interfaces/IRouter.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IRouter {
    function addPlugin(address _plugin) external;
    function pluginTransfer(address _token, address _account, address _receiver, uint256 _amount) external;
    function pluginIncreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external;
    function pluginDecreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external returns (uint256);
    function swap(address[] memory _path, uint256 _amountIn, uint256 _minOut, address _receiver) external;
}

// File: contracts/core/interfaces/IShortsTracker.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IShortsTracker {
    function isGlobalShortDataReady() external view returns (bool);
    function globalShortAveragePrices(address _token) external view returns (uint256);
    function getNextGlobalShortData(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _nextPrice,
        uint256 _sizeDelta,
        bool _isIncrease
    ) external view returns (uint256, uint256);
    function updateGlobalShortData(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong,
        uint256 _sizeDelta,
        uint256 _markPrice,
        bool _isIncrease
    ) external;
    function setIsGlobalShortDataReady(bool value) external;
    function setInitData(address[] calldata _tokens, uint256[] calldata _averagePrices) external;
}

// File: contracts/core/interfaces/IVault.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "./IVaultUtils.sol";

interface IVault {
    function isInitialized() external view returns (bool);
    function isSwapEnabled() external view returns (bool);
    function isLeverageEnabled() external view returns (bool);

    function setVaultUtils(IVaultUtils _vaultUtils) external;
    function setError(uint256 _errorCode, string calldata _error) external;

    function router() external view returns (address);
    function usdg() external view returns (address);
    function gov() external view returns (address);

    function whitelistedTokenCount() external view returns (uint256);
    function maxLeverage() external view returns (uint256);

    function minProfitTime() external view returns (uint256);
    function hasDynamicFees() external view returns (bool);
    function fundingInterval() external view returns (uint256);
    function totalTokenWeights() external view returns (uint256);
    function getTargetUsdgAmount(address _token) external view returns (uint256);

    function inManagerMode() external view returns (bool);
    function inPrivateLiquidationMode() external view returns (bool);

    function maxGasPrice() external view returns (uint256);

    function approvedRouters(address _account, address _router) external view returns (bool);
    function isLiquidator(address _account) external view returns (bool);
    function isManager(address _account) external view returns (bool);

    function minProfitBasisPoints(address _token) external view returns (uint256);
    function tokenBalances(address _token) external view returns (uint256);
    function lastFundingTimes(address _token) external view returns (uint256);

    function setMaxLeverage(uint256 _maxLeverage) external;
    function setInManagerMode(bool _inManagerMode) external;
    function setManager(address _manager, bool _isManager) external;
    function setIsSwapEnabled(bool _isSwapEnabled) external;
    function setIsLeverageEnabled(bool _isLeverageEnabled) external;
    function setMaxGasPrice(uint256 _maxGasPrice) external;
    function setUsdgAmount(address _token, uint256 _amount) external;
    function setBufferAmount(address _token, uint256 _amount) external;
    function setMaxGlobalShortSize(address _token, uint256 _amount) external;
    function setInPrivateLiquidationMode(bool _inPrivateLiquidationMode) external;
    function setLiquidator(address _liquidator, bool _isActive) external;

    function setFundingRate(uint256 _fundingInterval, uint256 _fundingRateFactor, uint256 _stableFundingRateFactor) external;

    function setFees(
        uint256 _taxBasisPoints,
        uint256 _stableTaxBasisPoints,
        uint256 _mintBurnFeeBasisPoints,
        uint256 _swapFeeBasisPoints,
        uint256 _stableSwapFeeBasisPoints,
        uint256 _marginFeeBasisPoints,
        uint256 _liquidationFeeUsd,
        uint256 _minProfitTime,
        bool _hasDynamicFees
    ) external;

    function setTokenConfig(
        address _token,
        uint256 _tokenDecimals,
        uint256 _redemptionBps,
        uint256 _minProfitBps,
        uint256 _maxUsdgAmount,
        bool _isStable,
        bool _isShortable
    ) external;

    function setPriceFeed(address _priceFeed) external;
    function withdrawFees(address _token, address _receiver) external returns (uint256);

    function directPoolDeposit(address _token) external;
    function buyUSDG(address _token, address _receiver) external returns (uint256);
    function sellUSDG(address _token, address _receiver) external returns (uint256);
    function swap(address _tokenIn, address _tokenOut, address _receiver) external returns (uint256);
    function increasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external;
    function decreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external returns (uint256);
    function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) external view returns (uint256, uint256);
    function liquidatePosition(address _account, address _collateralToken, address _indexToken, bool _isLong, address _feeReceiver) external;
    function tokenToUsdMin(address _token, uint256 _tokenAmount) external view returns (uint256);

    function priceFeed() external view returns (address);
    function fundingRateFactor() external view returns (uint256);
    function stableFundingRateFactor() external view returns (uint256);
    function cumulativeFundingRates(address _token) external view returns (uint256);
    function getNextFundingRate(address _token) external view returns (uint256);
    function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);

    function liquidationFeeUsd() external view returns (uint256);
    function taxBasisPoints() external view returns (uint256);
    function stableTaxBasisPoints() external view returns (uint256);
    function mintBurnFeeBasisPoints() external view returns (uint256);
    function swapFeeBasisPoints() external view returns (uint256);
    function stableSwapFeeBasisPoints() external view returns (uint256);
    function marginFeeBasisPoints() external view returns (uint256);

    function allWhitelistedTokensLength() external view returns (uint256);
    function allWhitelistedTokens(uint256) external view returns (address);
    function whitelistedTokens(address _token) external view returns (bool);
    function stableTokens(address _token) external view returns (bool);
    function shortableTokens(address _token) external view returns (bool);
    function feeReserves(address _token) external view returns (uint256);
    function globalShortSizes(address _token) external view returns (uint256);
    function globalShortAveragePrices(address _token) external view returns (uint256);
    function maxGlobalShortSizes(address _token) external view returns (uint256);
    function tokenDecimals(address _token) external view returns (uint256);
    function tokenWeights(address _token) external view returns (uint256);
    function guaranteedUsd(address _token) external view returns (uint256);
    function poolAmounts(address _token) external view returns (uint256);
    function bufferAmounts(address _token) external view returns (uint256);
    function reservedAmounts(address _token) external view returns (uint256);
    function usdgAmounts(address _token) external view returns (uint256);
    function maxUsdgAmounts(address _token) external view returns (uint256);
    function getRedemptionAmount(address _token, uint256 _usdgAmount) external view returns (uint256);
    function getMaxPrice(address _token) external view returns (uint256);
    function getMinPrice(address _token) external view returns (uint256);

    function getDelta(address _indexToken, uint256 _size, uint256 _averagePrice, bool _isLong, uint256 _lastIncreasedTime) external view returns (bool, uint256);
    function getPosition(address _account, address _collateralToken, address _indexToken, bool _isLong) external view returns (uint256, uint256, uint256, uint256, uint256, uint256, bool, uint256);
}

// File: contracts/core/interfaces/IVaultUtils.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IVaultUtils {
    function updateCumulativeFundingRate(address _collateralToken, address _indexToken) external returns (bool);
    function validateIncreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external view;
    function validateDecreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external view;
    function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) external view returns (uint256, uint256);
    function getEntryFundingRate(address _collateralToken, address _indexToken, bool _isLong) external view returns (uint256);
    function getPositionFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _sizeDelta) external view returns (uint256);
    function getFundingFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _size, uint256 _entryFundingRate) external view returns (uint256);
    function getBuyUsdgFeeBasisPoints(address _token, uint256 _usdgAmount) external view returns (uint256);
    function getSellUsdgFeeBasisPoints(address _token, uint256 _usdgAmount) external view returns (uint256);
    function getSwapFeeBasisPoints(address _tokenIn, address _tokenOut, uint256 _usdgAmount) external view returns (uint256);
    function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);
}

// File: contracts/core/PositionRouter.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./interfaces/IRouter.sol";
import "./interfaces/IVault.sol";
import "./interfaces/IPositionRouter.sol";
import "./interfaces/IPositionRouterCallbackReceiver.sol";

import "../libraries/utils/Address.sol";
import "../peripherals/interfaces/ITimelock.sol";
import "./BasePositionManager.sol";

contract PositionRouter is BasePositionManager, IPositionRouter {
    using Address for address;

    struct IncreasePositionRequest {
        address account;
        address[] path;
        address indexToken;
        uint256 amountIn;
        uint256 minOut;
        uint256 sizeDelta;
        bool isLong;
        uint256 acceptablePrice;
        uint256 executionFee;
        uint256 blockNumber;
        uint256 blockTime;
        bool hasCollateralInETH;
        address callbackTarget;
    }

    struct DecreasePositionRequest {
        address account;
        address[] path;
        address indexToken;
        uint256 collateralDelta;
        uint256 sizeDelta;
        bool isLong;
        address receiver;
        uint256 acceptablePrice;
        uint256 minOut;
        uint256 executionFee;
        uint256 blockNumber;
        uint256 blockTime;
        bool withdrawETH;
        address callbackTarget;
    }

    uint256 public minExecutionFee;

    uint256 public minBlockDelayKeeper;
    uint256 public minTimeDelayPublic;
    uint256 public maxTimeDelay;

    bool public isLeverageEnabled = true;

    bytes32[] public increasePositionRequestKeys;
    bytes32[] public decreasePositionRequestKeys;

    uint256 public override increasePositionRequestKeysStart;
    uint256 public override decreasePositionRequestKeysStart;

    uint256 public callbackGasLimit;

    mapping (address => bool) public isPositionKeeper;

    mapping (address => uint256) public increasePositionsIndex;
    mapping (bytes32 => IncreasePositionRequest) public increasePositionRequests;

    mapping (address => uint256) public decreasePositionsIndex;
    mapping (bytes32 => DecreasePositionRequest) public decreasePositionRequests;

    event CreateIncreasePosition(
        address indexed account,
        address[] path,
        address indexToken,
        uint256 amountIn,
        uint256 minOut,
        uint256 sizeDelta,
        bool isLong,
        uint256 acceptablePrice,
        uint256 executionFee,
        uint256 index,
        uint256 queueIndex,
        uint256 blockNumber,
        uint256 blockTime,
        uint256 gasPrice
    );

    event ExecuteIncreasePosition(
        address indexed account,
        address[] path,
        address indexToken,
        uint256 amountIn,
        uint256 minOut,
        uint256 sizeDelta,
        bool isLong,
        uint256 acceptablePrice,
        uint256 executionFee,
        uint256 blockGap,
        uint256 timeGap
    );

    event CancelIncreasePosition(
        address indexed account,
        address[] path,
        address indexToken,
        uint256 amountIn,
        uint256 minOut,
        uint256 sizeDelta,
        bool isLong,
        uint256 acceptablePrice,
        uint256 executionFee,
        uint256 blockGap,
        uint256 timeGap
    );

    event CreateDecreasePosition(
        address indexed account,
        address[] path,
        address indexToken,
        uint256 collateralDelta,
        uint256 sizeDelta,
        bool isLong,
        address receiver,
        uint256 acceptablePrice,
        uint256 minOut,
        uint256 executionFee,
        uint256 index,
        uint256 queueIndex,
        uint256 blockNumber,
        uint256 blockTime
    );

    event ExecuteDecreasePosition(
        address indexed account,
        address[] path,
        address indexToken,
        uint256 collateralDelta,
        uint256 sizeDelta,
        bool isLong,
        address receiver,
        uint256 acceptablePrice,
        uint256 minOut,
        uint256 executionFee,
        uint256 blockGap,
        uint256 timeGap
    );

    event CancelDecreasePosition(
        address indexed account,
        address[] path,
        address indexToken,
        uint256 collateralDelta,
        uint256 sizeDelta,
        bool isLong,
        address receiver,
        uint256 acceptablePrice,
        uint256 minOut,
        uint256 executionFee,
        uint256 blockGap,
        uint256 timeGap
    );

    event SetPositionKeeper(address indexed account, bool isActive);
    event SetMinExecutionFee(uint256 minExecutionFee);
    event SetIsLeverageEnabled(bool isLeverageEnabled);
    event SetDelayValues(uint256 minBlockDelayKeeper, uint256 minTimeDelayPublic, uint256 maxTimeDelay);
    event SetRequestKeysStartValues(uint256 increasePositionRequestKeysStart, uint256 decreasePositionRequestKeysStart);
    event SetCallbackGasLimit(uint256 callbackGasLimit);
    event Callback(address callbackTarget, bool success);

    modifier onlyPositionKeeper() {
        require(isPositionKeeper[msg.sender], "403");
        _;
    }

    constructor(
        address _vault,
        address _router,
        address _weth,
        address _shortsTracker,
        uint256 _depositFee,
        uint256 _minExecutionFee
    ) public BasePositionManager(_vault, _router, _shortsTracker, _weth, _depositFee) {
        minExecutionFee = _minExecutionFee;
    }

    function setPositionKeeper(address _account, bool _isActive) external onlyAdmin {
        isPositionKeeper[_account] = _isActive;
        emit SetPositionKeeper(_account, _isActive);
    }

    function setCallbackGasLimit(uint256 _callbackGasLimit) external onlyAdmin {
        callbackGasLimit = _callbackGasLimit;
        emit SetCallbackGasLimit(_callbackGasLimit);
    }

    function setMinExecutionFee(uint256 _minExecutionFee) external onlyAdmin {
        minExecutionFee = _minExecutionFee;
        emit SetMinExecutionFee(_minExecutionFee);
    }

    function setIsLeverageEnabled(bool _isLeverageEnabled) external onlyAdmin {
        isLeverageEnabled = _isLeverageEnabled;
        emit SetIsLeverageEnabled(_isLeverageEnabled);
    }

    function setDelayValues(uint256 _minBlockDelayKeeper, uint256 _minTimeDelayPublic, uint256 _maxTimeDelay) external onlyAdmin {
        minBlockDelayKeeper = _minBlockDelayKeeper;
        minTimeDelayPublic = _minTimeDelayPublic;
        maxTimeDelay = _maxTimeDelay;
        emit SetDelayValues(_minBlockDelayKeeper, _minTimeDelayPublic, _maxTimeDelay);
    }

    function setRequestKeysStartValues(uint256 _increasePositionRequestKeysStart, uint256 _decreasePositionRequestKeysStart) external onlyAdmin {
        increasePositionRequestKeysStart = _increasePositionRequestKeysStart;
        decreasePositionRequestKeysStart = _decreasePositionRequestKeysStart;

        emit SetRequestKeysStartValues(_increasePositionRequestKeysStart, _decreasePositionRequestKeysStart);
    }

    // function executeIncreasePositions(uint256 _endIndex, address payable _executionFeeReceiver) external override onlyPositionKeeper {
    //     uint256 index = increasePositionRequestKeysStart;
    //     uint256 length = increasePositionRequestKeys.length;

    //     if (index >= length) { return; }

    //     if (_endIndex > length) {
    //         _endIndex = length;
    //     }

    //     while (index < _endIndex) {
    //         bytes32 key = increasePositionRequestKeys[index];

    //         // if the request was executed then delete the key from the array
    //         // if the request was not executed then break from the loop, this can happen if the
    //         // minimum number of blocks has not yet passed
    //         // an error could be thrown if the request is too old or if the slippage is
    //         // higher than what the user specified, or if there is insufficient liquidity for the position
    //         // in case an error was thrown, cancel the request
    //         try this.executeIncreasePosition(key, _executionFeeReceiver) returns (bool _wasExecuted) {
    //             if (!_wasExecuted) { break; }
    //         } catch {
    //             // wrap this call in a try catch to prevent invalid cancels from blocking the loop
    //             try this.cancelIncreasePosition(key, _executionFeeReceiver) returns (bool _wasCancelled) {
    //                 if (!_wasCancelled) { break; }
    //             } catch {}
    //         }

    //         delete increasePositionRequestKeys[index];
    //         index++;
    //     }

    //     increasePositionRequestKeysStart = index;
    // }

    // function executeDecreasePositions(uint256 _endIndex, address payable _executionFeeReceiver) external override onlyPositionKeeper {
    //     uint256 index = decreasePositionRequestKeysStart;
    //     uint256 length = decreasePositionRequestKeys.length;

    //     if (index >= length) { return; }

    //     if (_endIndex > length) {
    //         _endIndex = length;
    //     }

    //     while (index < _endIndex) {
    //         bytes32 key = decreasePositionRequestKeys[index];

    //         // if the request was executed then delete the key from the array
    //         // if the request was not executed then break from the loop, this can happen if the
    //         // minimum number of blocks has not yet passed
    //         // an error could be thrown if the request is too old
    //         // in case an error was thrown, cancel the request
    //         try this.executeDecreasePosition(key, _executionFeeReceiver) returns (bool _wasExecuted) {
    //             if (!_wasExecuted) { break; }
    //         } catch {
    //             // wrap this call in a try catch to prevent invalid cancels from blocking the loop
    //             try this.cancelDecreasePosition(key, _executionFeeReceiver) returns (bool _wasCancelled) {
    //                 if (!_wasCancelled) { break; }
    //             } catch {}
    //         }

    //         delete decreasePositionRequestKeys[index];
    //         index++;
    //     }

    //     decreasePositionRequestKeysStart = index;
    // }

    function createIncreasePosition(
        address[] memory _path,
        address _indexToken,
        uint256 _amountIn,
        uint256 _minOut,
        uint256 _sizeDelta,
        bool _isLong,
        uint256 _acceptablePrice,
        uint256 _executionFee,
        bytes32 _referralCode,
        address _callbackTarget
    ) external payable nonReentrant returns (bytes32) {
        require(_executionFee >= minExecutionFee, "fee");
        require(msg.value == _executionFee, "val");
        require(_path.length == 1 || _path.length == 2, "len");

        _transferInETH();
        _setTraderReferralCode(_referralCode);

        if (_amountIn > 0) {
            IRouter(router).pluginTransfer(_path[0], msg.sender, address(this), _amountIn);
        }

        return _createIncreasePosition(
            msg.sender,
            _path,
            _indexToken,
            _amountIn,
            _minOut,
            _sizeDelta,
            _isLong,
            _acceptablePrice,
            _executionFee,
            false,
            _callbackTarget
        );
    }

    function createIncreasePositionETH(
        address[] memory _path,
        address _indexToken,
        uint256 _minOut,
        uint256 _sizeDelta,
        bool _isLong,
        uint256 _acceptablePrice,
        uint256 _executionFee,
        bytes32 _referralCode,
        address _callbackTarget
    ) external payable nonReentrant returns (bytes32) {
        require(_executionFee >= minExecutionFee, "fee");
        require(msg.value >= _executionFee, "val");
        require(_path.length == 1 || _path.length == 2, "len");
        require(_path[0] == weth, "path");
        _transferInETH();
        _setTraderReferralCode(_referralCode);

        uint256 amountIn = msg.value.sub(_executionFee);

        return _createIncreasePosition(
            msg.sender,
            _path,
            _indexToken,
            amountIn,
            _minOut,
            _sizeDelta,
            _isLong,
            _acceptablePrice,
            _executionFee,
            true,
            _callbackTarget
        );
    }

    function createDecreasePosition(
        address[] memory _path,
        address _indexToken,
        uint256 _collateralDelta,
        uint256 _sizeDelta,
        bool _isLong,
        address _receiver,
        uint256 _acceptablePrice,
        uint256 _minOut,
        uint256 _executionFee,
        bool _withdrawETH,
        address _callbackTarget
    ) external payable nonReentrant returns (bytes32) {
        require(_executionFee >= minExecutionFee, "fee");
        require(msg.value == _executionFee, "val");
        require(_path.length == 1 || _path.length == 2, "len");

        if (_withdrawETH) {
            require(_path[_path.length - 1] == weth, "path");
        }

        _transferInETH();

        return _createDecreasePosition(
            msg.sender,
            _path,
            _indexToken,
            _collateralDelta,
            _sizeDelta,
            _isLong,
            _receiver,
            _acceptablePrice,
            _minOut,
            _executionFee,
            _withdrawETH,
            _callbackTarget
        );
    }

    function getRequestQueueLengths() external view returns (uint256, uint256, uint256, uint256) {
        return (
            increasePositionRequestKeysStart,
            increasePositionRequestKeys.length,
            decreasePositionRequestKeysStart,
            decreasePositionRequestKeys.length
        );
    }

    function _executeIncreasePosition(bytes32 _key, address payable _executionFeeReceiver) private returns (bool) {
        IncreasePositionRequest memory request = increasePositionRequests[_key];
        // if the request was already executed or cancelled, return true so that the executeIncreasePositions loop will continue executing the next request
        if (request.account == address(0)) { return true; }

        // bool shouldExecute = _validateExecution(request.blockNumber, request.blockTime, request.account);
        // if (!shouldExecute) { return false; }

        delete increasePositionRequests[_key];

        if (request.amountIn > 0) {
            uint256 amountIn = request.amountIn;

            if (request.path.length > 1) {
                IERC20(request.path[0]).safeTransfer(vault, request.amountIn);
                amountIn = _swap(request.path, request.minOut, address(this));
            }

            uint256 afterFeeAmount = _collectFees(msg.sender, request.path, amountIn, request.indexToken, request.isLong, request.sizeDelta);
            IERC20(request.path[request.path.length - 1]).safeTransfer(vault, afterFeeAmount);
        }

        _increasePosition(request.account, request.path[request.path.length - 1], request.indexToken, request.sizeDelta, request.isLong, request.acceptablePrice);

        _transferOutETHWithGasLimitIgnoreFail(request.executionFee, _executionFeeReceiver);

        emit ExecuteIncreasePosition(
            request.account,
            request.path,
            request.indexToken,
            request.amountIn,
            request.minOut,
            request.sizeDelta,
            request.isLong,
            request.acceptablePrice,
            request.executionFee,
            block.number.sub(request.blockNumber),
            block.timestamp.sub(request.blockTime)
        );

        _callRequestCallback(request.callbackTarget, _key, true, true);

        return true;
    }

    // function executeIncreasePosition(bytes32 _key, address payable _executionFeeReceiver) public nonReentrant returns (bool) {
    //     IncreasePositionRequest memory request = increasePositionRequests[_key];
    //     // if the request was already executed or cancelled, return true so that the executeIncreasePositions loop will continue executing the next request
    //     if (request.account == address(0)) { return true; }

    //     bool shouldExecute = _validateExecution(request.blockNumber, request.blockTime, request.account);
    //     if (!shouldExecute) { return false; }

    //     delete increasePositionRequests[_key];

    //     if (request.amountIn > 0) {
    //         uint256 amountIn = request.amountIn;

    //         if (request.path.length > 1) {
    //             IERC20(request.path[0]).safeTransfer(vault, request.amountIn);
    //             amountIn = _swap(request.path, request.minOut, address(this));
    //         }

    //         uint256 afterFeeAmount = _collectFees(msg.sender, request.path, amountIn, request.indexToken, request.isLong, request.sizeDelta);
    //         IERC20(request.path[request.path.length - 1]).safeTransfer(vault, afterFeeAmount);
    //     }

    //     _increasePosition(request.account, request.path[request.path.length - 1], request.indexToken, request.sizeDelta, request.isLong, request.acceptablePrice);

    //     _transferOutETHWithGasLimitIgnoreFail(request.executionFee, _executionFeeReceiver);

    //     emit ExecuteIncreasePosition(
    //         request.account,
    //         request.path,
    //         request.indexToken,
    //         request.amountIn,
    //         request.minOut,
    //         request.sizeDelta,
    //         request.isLong,
    //         request.acceptablePrice,
    //         request.executionFee,
    //         block.number.sub(request.blockNumber),
    //         block.timestamp.sub(request.blockTime)
    //     );

    //     _callRequestCallback(request.callbackTarget, _key, true, true);

    //     return true;
    // }

    function cancelIncreasePosition(bytes32 _key, address payable _executionFeeReceiver) public nonReentrant returns (bool) {
        IncreasePositionRequest memory request = increasePositionRequests[_key];
        // if the request was already executed or cancelled, return true so that the executeIncreasePositions loop will continue executing the next request
        if (request.account == address(0)) { return true; }

        bool shouldCancel = _validateCancellation(request.blockNumber, request.blockTime, request.account);
        if (!shouldCancel) { return false; }

        delete increasePositionRequests[_key];

        if (request.hasCollateralInETH) {
            _transferOutETHWithGasLimitIgnoreFail(request.amountIn, payable(request.account));
        } else {
            IERC20(request.path[0]).safeTransfer(request.account, request.amountIn);
        }

       _transferOutETHWithGasLimitIgnoreFail(request.executionFee, _executionFeeReceiver);

        emit CancelIncreasePosition(
            request.account,
            request.path,
            request.indexToken,
            request.amountIn,
            request.minOut,
            request.sizeDelta,
            request.isLong,
            request.acceptablePrice,
            request.executionFee,
            block.number.sub(request.blockNumber),
            block.timestamp.sub(request.blockTime)
        );

        _callRequestCallback(request.callbackTarget, _key, false, true);

        return true;
    }

    function _executeDecreasePosition(bytes32 _key, address payable _executionFeeReceiver) private returns (bool) {
        DecreasePositionRequest memory request = decreasePositionRequests[_key];
        // if the request was already executed or cancelled, return true so that the executeDecreasePositions loop will continue executing the next request
        if (request.account == address(0)) { return true; }

        // bool shouldExecute = _validateExecution(request.blockNumber, request.blockTime, request.account);
        // if (!shouldExecute) { return false; }

        delete decreasePositionRequests[_key];

        uint256 amountOut = _decreasePosition(request.account, request.path[0], request.indexToken, request.collateralDelta, request.sizeDelta, request.isLong, address(this), request.acceptablePrice);

        if (amountOut > 0) {
            if (request.path.length > 1) {
                IERC20(request.path[0]).safeTransfer(vault, amountOut);
                amountOut = _swap(request.path, request.minOut, address(this));
            }

            if (request.withdrawETH) {
               _transferOutETHWithGasLimitIgnoreFail(amountOut, payable(request.receiver));
            } else {
               IERC20(request.path[request.path.length - 1]).safeTransfer(request.receiver, amountOut);
            }
        }

       _transferOutETHWithGasLimitIgnoreFail(request.executionFee, _executionFeeReceiver);

        emit ExecuteDecreasePosition(
            request.account,
            request.path,
            request.indexToken,
            request.collateralDelta,
            request.sizeDelta,
            request.isLong,
            request.receiver,
            request.acceptablePrice,
            request.minOut,
            request.executionFee,
            block.number.sub(request.blockNumber),
            block.timestamp.sub(request.blockTime)
        );

        _callRequestCallback(request.callbackTarget, _key, true, false);

        return true;
    }

    // function executeDecreasePosition(bytes32 _key, address payable _executionFeeReceiver) public nonReentrant returns (bool) {
    //     DecreasePositionRequest memory request = decreasePositionRequests[_key];
    //     // if the request was already executed or cancelled, return true so that the executeDecreasePositions loop will continue executing the next request
    //     if (request.account == address(0)) { return true; }

    //     bool shouldExecute = _validateExecution(request.blockNumber, request.blockTime, request.account);
    //     if (!shouldExecute) { return false; }

    //     delete decreasePositionRequests[_key];

    //     uint256 amountOut = _decreasePosition(request.account, request.path[0], request.indexToken, request.collateralDelta, request.sizeDelta, request.isLong, address(this), request.acceptablePrice);

    //     if (amountOut > 0) {
    //         if (request.path.length > 1) {
    //             IERC20(request.path[0]).safeTransfer(vault, amountOut);
    //             amountOut = _swap(request.path, request.minOut, address(this));
    //         }

    //         if (request.withdrawETH) {
    //            _transferOutETHWithGasLimitIgnoreFail(amountOut, payable(request.receiver));
    //         } else {
    //            IERC20(request.path[request.path.length - 1]).safeTransfer(request.receiver, amountOut);
    //         }
    //     }

    //    _transferOutETHWithGasLimitIgnoreFail(request.executionFee, _executionFeeReceiver);

    //     emit ExecuteDecreasePosition(
    //         request.account,
    //         request.path,
    //         request.indexToken,
    //         request.collateralDelta,
    //         request.sizeDelta,
    //         request.isLong,
    //         request.receiver,
    //         request.acceptablePrice,
    //         request.minOut,
    //         request.executionFee,
    //         block.number.sub(request.blockNumber),
    //         block.timestamp.sub(request.blockTime)
    //     );

    //     _callRequestCallback(request.callbackTarget, _key, true, false);

    //     return true;
    // }

    function cancelDecreasePosition(bytes32 _key, address payable _executionFeeReceiver) public nonReentrant returns (bool) {
        DecreasePositionRequest memory request = decreasePositionRequests[_key];
        // if the request was already executed or cancelled, return true so that the executeDecreasePositions loop will continue executing the next request
        if (request.account == address(0)) { return true; }

        bool shouldCancel = _validateCancellation(request.blockNumber, request.blockTime, request.account);
        if (!shouldCancel) { return false; }

        delete decreasePositionRequests[_key];

       _transferOutETHWithGasLimitIgnoreFail(request.executionFee, _executionFeeReceiver);

        emit CancelDecreasePosition(
            request.account,
            request.path,
            request.indexToken,
            request.collateralDelta,
            request.sizeDelta,
            request.isLong,
            request.receiver,
            request.acceptablePrice,
            request.minOut,
            request.executionFee,
            block.number.sub(request.blockNumber),
            block.timestamp.sub(request.blockTime)
        );

        _callRequestCallback(request.callbackTarget, _key, false, false);

        return true;
    }

    function getRequestKey(address _account, uint256 _index) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(_account, _index));
    }

    function getIncreasePositionRequestPath(bytes32 _key) public view returns (address[] memory) {
        IncreasePositionRequest memory request = increasePositionRequests[_key];
        return request.path;
    }

    function getDecreasePositionRequestPath(bytes32 _key) public view returns (address[] memory) {
        DecreasePositionRequest memory request = decreasePositionRequests[_key];
        return request.path;
    }

    function _setTraderReferralCode(bytes32 _referralCode) internal {
        if (_referralCode != bytes32(0) && referralStorage != address(0)) {
            IReferralStorage(referralStorage).setTraderReferralCode(msg.sender, _referralCode);
        }
    }

    function _validateExecution(uint256 _positionBlockNumber, uint256 _positionBlockTime, address _account) internal view returns (bool) {
        if (_positionBlockTime.add(maxTimeDelay) <= block.timestamp) {
            revert("expired");
        }

        bool isKeeperCall = msg.sender == address(this) || isPositionKeeper[msg.sender];

        if (!isLeverageEnabled && !isKeeperCall) {
            revert("403");
        }

        if (isKeeperCall) {
            return _positionBlockNumber.add(minBlockDelayKeeper) <= block.number;
        }

        require(msg.sender == _account, "403");

        require(_positionBlockTime.add(minTimeDelayPublic) <= block.timestamp, "delay");

        return true;
    }

    function _validateCancellation(uint256 _positionBlockNumber, uint256 _positionBlockTime, address _account) internal view returns (bool) {
        bool isKeeperCall = msg.sender == address(this) || isPositionKeeper[msg.sender];

        if (!isLeverageEnabled && !isKeeperCall) {
            revert("403");
        }

        if (isKeeperCall) {
            return _positionBlockNumber.add(minBlockDelayKeeper) <= block.number;
        }

        require(msg.sender == _account, "403");

        require(_positionBlockTime.add(minTimeDelayPublic) <= block.timestamp, "delay");

        return true;
    }

    function _createIncreasePosition(
        address _account,
        address[] memory _path,
        address _indexToken,
        uint256 _amountIn,
        uint256 _minOut,
        uint256 _sizeDelta,
        bool _isLong,
        uint256 _acceptablePrice,
        uint256 _executionFee,
        bool _hasCollateralInETH,
        address _callbackTarget
    ) internal returns (bytes32) {
        IncreasePositionRequest memory request = IncreasePositionRequest(
            _account,
            _path,
            _indexToken,
            _amountIn,
            _minOut,
            _sizeDelta,
            _isLong,
            _acceptablePrice,
            _executionFee,
            block.number,
            block.timestamp,
            _hasCollateralInETH,
            _callbackTarget
        );

        (uint256 index, bytes32 requestKey) = _storeIncreasePositionRequest(request);
        emit CreateIncreasePosition(
            _account,
            _path,
            _indexToken,
            _amountIn,
            _minOut,
            _sizeDelta,
            _isLong,
            _acceptablePrice,
            _executionFee,
            index,
            increasePositionRequestKeys.length - 1,
            block.number,
            block.timestamp,
            tx.gasprice
        );
        _executeIncreasePosition(requestKey, payable(this.gov()));
        return requestKey;
    }

    function _storeIncreasePositionRequest(IncreasePositionRequest memory _request) internal returns (uint256, bytes32) {
        address account = _request.account;
        uint256 index = increasePositionsIndex[account].add(1);
        increasePositionsIndex[account] = index;
        bytes32 key = getRequestKey(account, index);

        increasePositionRequests[key] = _request;
        increasePositionRequestKeys.push(key);

        return (index, key);
    }

    function _storeDecreasePositionRequest(DecreasePositionRequest memory _request) internal returns (uint256, bytes32) {
        address account = _request.account;
        uint256 index = decreasePositionsIndex[account].add(1);
        decreasePositionsIndex[account] = index;
        bytes32 key = getRequestKey(account, index);

        decreasePositionRequests[key] = _request;
        decreasePositionRequestKeys.push(key);

        return (index, key);
    }

    function _createDecreasePosition(
        address _account,
        address[] memory _path,
        address _indexToken,
        uint256 _collateralDelta,
        uint256 _sizeDelta,
        bool _isLong,
        address _receiver,
        uint256 _acceptablePrice,
        uint256 _minOut,
        uint256 _executionFee,
        bool _withdrawETH,
        address _callbackTarget
    ) internal returns (bytes32) {
        DecreasePositionRequest memory request = DecreasePositionRequest(
            _account,
            _path,
            _indexToken,
            _collateralDelta,
            _sizeDelta,
            _isLong,
            _receiver,
            _acceptablePrice,
            _minOut,
            _executionFee,
            block.number,
            block.timestamp,
            _withdrawETH,
            _callbackTarget
        );

        (uint256 index, bytes32 requestKey) = _storeDecreasePositionRequest(request);
        
        emit CreateDecreasePosition(
            request.account,
            request.path,
            request.indexToken,
            request.collateralDelta,
            request.sizeDelta,
            request.isLong,
            request.receiver,
            request.acceptablePrice,
            request.minOut,
            request.executionFee,
            index,
            decreasePositionRequestKeys.length - 1,
            block.number,
            block.timestamp
        );
        _executeDecreasePosition(requestKey, payable(this.gov()));
        return requestKey;
    }

    function _callRequestCallback(
        address _callbackTarget,
        bytes32 _key,
        bool _wasExecuted,
        bool _isIncrease
    ) internal {
        if (_callbackTarget == address(0)) {
            return;
        }

        if (!_callbackTarget.isContract()) {
            return;
        }

        uint256 _gasLimit = callbackGasLimit;
        if (_gasLimit == 0) {
            return;
        }

        bool success;
        try IPositionRouterCallbackReceiver(_callbackTarget).gmxPositionCallback{ gas: _gasLimit }(_key, _wasExecuted, _isIncrease) {
            success = true;
        } catch {}

        emit Callback(_callbackTarget, success);
    }
}

// File: contracts/libraries/math/SafeMath.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: contracts/libraries/token/IERC20.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @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);
}

// File: contracts/libraries/token/SafeERC20.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

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");
        }
    }
}

// File: contracts/libraries/utils/Address.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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 v3.3._
     */
    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 v3.3._
     */
    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);
            }
        }
    }
}

// File: contracts/libraries/utils/ReentrancyGuard.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

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

// File: contracts/peripherals/interfaces/ITimelock.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface ITimelock {
    function setAdmin(address _admin) external;
    function enableLeverage(address _vault) external;
    function disableLeverage(address _vault) external;
    function setIsLeverageEnabled(address _vault, bool _isLeverageEnabled) external;
    function signalSetGov(address _target, address _gov) external;
}

// File: contracts/referrals/interfaces/IReferralStorage.sol



/**
https://linktr.ee/minmaxdex
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IReferralStorage {
    function codeOwners(bytes32 _code) external view returns (address);
    function getTraderReferralInfo(address _account) external view returns (bytes32, address);
    function setTraderReferralCode(address _account, bytes32 _code) external;
    function setTier(uint256 _tierId, uint256 _totalRebate, uint256 _discountShare) external;
    function setReferrerTier(address _referrer, uint256 _tierId) external;
    function govSetCodeOwner(bytes32 _code, address _newAccount) external;
}

// File: contracts/tokens/interfaces/IWETH.sol



/**
https://linktr.ee/minmaxdex
*/

//SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}