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// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "../libraries/math/SafeMath.sol";

import "../access/Governable.sol";
import "./interfaces/IShortsTracker.sol";
import "./interfaces/IVault.sol";

contract ShortsTracker is Governable, IShortsTracker {
    using SafeMath for uint256;

    event GlobalShortDataUpdated(address indexed token, uint256 globalShortSize, uint256 globalShortAveragePrice);

    uint256 public constant MAX_INT256 = uint256(type(int256).max);

    IVault public vault;

    mapping (address => bool) public isHandler;
    mapping (bytes32 => bytes32) public data;

    mapping (address => uint256) override public globalShortAveragePrices;
    bool override public isGlobalShortDataReady;

    modifier onlyHandler() {
        require(isHandler[msg.sender], "ShortsTracker: forbidden");
        _;
    }

    constructor(address _vault) public {
        vault = IVault(_vault);
    }

    function setHandler(address _handler, bool _isActive) external onlyGov {
        require(_handler != address(0), "ShortsTracker: invalid _handler");
        isHandler[_handler] = _isActive;
    }

    function _setGlobalShortAveragePrice(address _token, uint256 _averagePrice) internal {
        globalShortAveragePrices[_token] = _averagePrice;
    }

    function setIsGlobalShortDataReady(bool value) override external onlyGov {
        isGlobalShortDataReady = value;
    }

    function updateGlobalShortData(
        address _account,
        address _collateralToken,
        address _indexToken,
        bool _isLong,
        uint256 _sizeDelta,
        uint256 _markPrice,
        bool _isIncrease
    ) override external onlyHandler {
        if (_isLong || _sizeDelta == 0) {
            return;
        }

        if (!isGlobalShortDataReady) {
            return;
        }

        (uint256 globalShortSize, uint256 globalShortAveragePrice) = getNextGlobalShortData(
            _account,
            _collateralToken,
            _indexToken,
            _markPrice,
            _sizeDelta,
            _isIncrease
        );
        _setGlobalShortAveragePrice(_indexToken, globalShortAveragePrice);

        emit GlobalShortDataUpdated(_indexToken, globalShortSize, globalShortAveragePrice);
    }

    function getGlobalShortDelta(address _token) public view returns (bool, uint256) {
        uint256 size = vault.globalShortSizes(_token);
        uint256 averagePrice = globalShortAveragePrices[_token];
        if (size == 0) { return (false, 0); }

        uint256 nextPrice = IVault(vault).getMaxPrice(_token);
        uint256 priceDelta = averagePrice > nextPrice ? averagePrice.sub(nextPrice) : nextPrice.sub(averagePrice);
        uint256 delta = size.mul(priceDelta).div(averagePrice);
        bool hasProfit = averagePrice > nextPrice;

        return (hasProfit, delta);
    }


    function setInitData(address[] calldata _tokens, uint256[] calldata _averagePrices) override external onlyGov {
        require(!isGlobalShortDataReady, "ShortsTracker: already migrated");

        for (uint256 i = 0; i < _tokens.length; i++) {
            globalShortAveragePrices[_tokens[i]] = _averagePrices[i];
        }
        isGlobalShortDataReady = true;
    }

    function getNextGlobalShortData(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _nextPrice,
        uint256 _sizeDelta,
        bool _isIncrease
    ) override public view returns (uint256, uint256) {
        int256 realisedPnl = getRealisedPnl(_account,_collateralToken, _indexToken, _sizeDelta, _isIncrease);
        uint256 averagePrice = globalShortAveragePrices[_indexToken];
        uint256 priceDelta = averagePrice > _nextPrice ? averagePrice.sub(_nextPrice) : _nextPrice.sub(averagePrice);

        uint256 nextSize;
        uint256 delta;
        // avoid stack to deep
        {
            uint256 size = vault.globalShortSizes(_indexToken);
            nextSize = _isIncrease ? size.add(_sizeDelta) : size.sub(_sizeDelta);

            if (nextSize == 0) {
                return (0, 0);
            }

            if (averagePrice == 0) {
                return (nextSize, _nextPrice);
            }

            delta = size.mul(priceDelta).div(averagePrice);
        }

        uint256 nextAveragePrice = _getNextGlobalAveragePrice(
            averagePrice,
            _nextPrice,
            nextSize,
            delta,
            realisedPnl
        );

        return (nextSize, nextAveragePrice);
    }

    function getRealisedPnl(
        address _account,
        address _collateralToken,
        address _indexToken,
        uint256 _sizeDelta,
        bool _isIncrease
    ) public view returns (int256) {
        if (_isIncrease) {
            return 0;
        }

        IVault _vault = vault;
        (uint256 size, /*uint256 collateral*/, uint256 averagePrice, , , , , uint256 lastIncreasedTime) = _vault.getPosition(_account, _collateralToken, _indexToken, false);

        (bool hasProfit, uint256 delta) = _vault.getDelta(_indexToken, size, averagePrice, false, lastIncreasedTime);
        // get the proportional change in pnl
        uint256 adjustedDelta = _sizeDelta.mul(delta).div(size);
        require(adjustedDelta < MAX_INT256, "ShortsTracker: overflow");
        return hasProfit ? int256(adjustedDelta) : -int256(adjustedDelta);
    }

    function _getNextGlobalAveragePrice(
        uint256 _averagePrice,
        uint256 _nextPrice,
        uint256 _nextSize,
        uint256 _delta,
        int256 _realisedPnl
    ) public pure returns (uint256) {
        (bool hasProfit, uint256 nextDelta) = _getNextDelta(_delta, _averagePrice, _nextPrice, _realisedPnl);

        uint256 nextAveragePrice = _nextPrice
            .mul(_nextSize)
            .div(hasProfit ? _nextSize.sub(nextDelta) : _nextSize.add(nextDelta));

        return nextAveragePrice;
    }

    function _getNextDelta(
        uint256 _delta,
        uint256 _averagePrice,
        uint256 _nextPrice,
        int256 _realisedPnl
    ) internal pure returns (bool, uint256) {
        // global delta 10000, realised pnl 1000 => new pnl 9000
        // global delta 10000, realised pnl -1000 => new pnl 11000
        // global delta -10000, realised pnl 1000 => new pnl -11000
        // global delta -10000, realised pnl -1000 => new pnl -9000
        // global delta 10000, realised pnl 11000 => new pnl -1000 (flips sign)
        // global delta -10000, realised pnl -11000 => new pnl 1000 (flips sign)

        bool hasProfit = _averagePrice > _nextPrice;
        if (hasProfit) {
            // global shorts pnl is positive
            if (_realisedPnl > 0) {
                if (uint256(_realisedPnl) > _delta) {
                    _delta = uint256(_realisedPnl).sub(_delta);
                    hasProfit = false;
                } else {
                    _delta = _delta.sub(uint256(_realisedPnl));
                }
            } else {
                _delta = _delta.add(uint256(-_realisedPnl));
            }

            return (hasProfit, _delta);
        }

        if (_realisedPnl > 0) {
            _delta = _delta.add(uint256(_realisedPnl));
        } else {
            if (uint256(-_realisedPnl) > _delta) {
                _delta = uint256(-_realisedPnl).sub(_delta);
                hasProfit = true;
            } else {
                _delta = _delta.sub(uint256(-_realisedPnl));
            }
        }
        return (hasProfit, _delta);
    }
}

// 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;
    }
}

// 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;
}

// 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 usdn() 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 getTargetUsdnAmount(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 setUsdnAmount(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 _maxUsdnAmount,
        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 buyUSDN(address _token, address _receiver) external returns (uint256);
    function sellUSDN(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 _usdnDelta, 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 usdnAmounts(address _token) external view returns (uint256);
    function maxUsdnAmounts(address _token) external view returns (uint256);
    function getRedemptionAmount(address _token, uint256 _usdnAmount) 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);
}

// 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 getBuyUsdnFeeBasisPoints(address _token, uint256 _usdnAmount) external view returns (uint256);
    function getSellUsdnFeeBasisPoints(address _token, uint256 _usdnAmount) external view returns (uint256);
    function getSwapFeeBasisPoints(address _tokenIn, address _tokenOut, uint256 _usdnAmount) external view returns (uint256);
    function getFeeBasisPoints(address _token, uint256 _usdnDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);
}

// 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;
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 14
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000e9263682e837efabb145f8c632b9d2c518d90652

-----Decoded View---------------
Arg [0] : _vault (address): 0xe9263682E837eFabb145f8C632B9d2c518D90652

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000e9263682e837efabb145f8c632b9d2c518d90652