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// SPDX-License-Identifier: MIT

import "../libraries/math/SafeMath.sol";
import "../access/Governable.sol";
import "../core/interfaces/IShortsTracker.sol";
import "./interfaces/IHandlerTarget.sol";

pragma solidity 0.6.12;

contract ShortsTrackerTimelock {
    using SafeMath for uint256;

    uint256 public constant BASIS_POINTS_DIVISOR = 10000;
    uint256 public constant MAX_BUFFER = 5 days;

    mapping (bytes32 => uint256) public pendingActions;

    address public admin;
    uint256 public buffer;

    mapping (address => bool) public isHandler;
    mapping (address => uint256) public lastUpdated;
    uint256 public averagePriceUpdateDelay;
    uint256 public maxAveragePriceChange;

    event GlobalShortAveragePriceUpdated(address indexed token, uint256 oldAveragePrice, uint256 newAveragePrice);

    event SignalSetGov(address target, address gov);
    event SetGov(address target, address gov);

    event SignalSetAdmin(address admin);
    event SetAdmin(address admin);

    event SetContractHandler(address indexed handler, bool isHandler);
    event SignalSetHandler(address target, address handler, bool isActive, bytes32 action);

    event SignalSetMaxAveragePriceChange(uint256 maxAveragePriceChange);
    event SetMaxAveragePriceChange(uint256 maxAveragePriceChange);

    event SignalSetAveragePriceUpdateDelay(uint256 averagePriceUpdateDelay);
    event SetAveragePriceUpdateDelay(uint256 averagePriceUpdateDelay);

    event SignalSetIsGlobalShortDataReady(address target, bool isGlobalShortDataReady);
    event SetIsGlobalShortDataReady(address target, bool isGlobalShortDataReady);

    event SignalPendingAction(bytes32 action);
    event ClearAction(bytes32 action);

    constructor(
        address _admin,
        uint256 _buffer,
        uint256 _averagePriceUpdateDelay,
        uint256 _maxAveragePriceChange
    ) public {
        admin = _admin;
        buffer = _buffer;
        averagePriceUpdateDelay = _averagePriceUpdateDelay;
        maxAveragePriceChange = _maxAveragePriceChange;
    }

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

    modifier onlyHandler() {
        require(isHandler[msg.sender] || msg.sender == admin, "ShortsTrackerTimelock: handler forbidden");
        _;
    }

    function setBuffer(uint256 _buffer) external onlyAdmin {
        require(_buffer <= MAX_BUFFER, "ShortsTrackerTimelock: invalid buffer");
        // require(_buffer > buffer, "ShortsTrackerTimelock: buffer cannot be decreased");
        buffer = _buffer;
    }

    function signalSetAdmin(address _admin) external onlyAdmin {
        require(_admin != address(0), "ShortsTrackerTimelock: invalid admin");

        bytes32 action = keccak256(abi.encodePacked("setAdmin", _admin));
        _setPendingAction(action);

        emit SignalSetAdmin(_admin);
    }

    function setAdmin(address _admin) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setAdmin", _admin));
        _validateAction(action);
        _clearAction(action);

        admin = _admin;

        emit SetAdmin(_admin);
    }

    function setContractHandler(address _handler, bool _isActive) external onlyAdmin {
        isHandler[_handler] = _isActive;

        emit SetContractHandler(_handler, _isActive);
    }

    function signalSetGov(address _shortsTracker, address _gov) external onlyAdmin {
        require(_gov != address(0), "ShortsTrackerTimelock: invalid gov");

        bytes32 action = keccak256(abi.encodePacked("setGov", _shortsTracker, _gov));
        _setPendingAction(action);

        emit SignalSetGov(_shortsTracker, _gov);
    }

    function setGov(address _shortsTracker, address _gov) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setGov", _shortsTracker, _gov));
        _validateAction(action);
        _clearAction(action);

        Governable(_shortsTracker).setGov(_gov);

        emit SetGov(_shortsTracker, _gov);
    }

    function signalSetHandler(address _target, address _handler, bool _isActive) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setHandler", _target, _handler, _isActive));
        _setPendingAction(action);
        emit SignalSetHandler(_target, _handler, _isActive, action);
    }

    function setHandler(address _target, address _handler, bool _isActive) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setHandler", _target, _handler, _isActive));
        _validateAction(action);
        _clearAction(action);
        IHandlerTarget(_target).setHandler(_handler, _isActive);
    }

    function signalSetAveragePriceUpdateDelay(uint256 _averagePriceUpdateDelay) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setAveragePriceUpdateDelay", _averagePriceUpdateDelay));
        _setPendingAction(action);

        emit SignalSetAveragePriceUpdateDelay(_averagePriceUpdateDelay);
    }

    function setAveragePriceUpdateDelay(uint256 _averagePriceUpdateDelay) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setAveragePriceUpdateDelay", _averagePriceUpdateDelay));
        _validateAction(action);
        _clearAction(action);

        averagePriceUpdateDelay = _averagePriceUpdateDelay;

        emit SetAveragePriceUpdateDelay(_averagePriceUpdateDelay);
    }

    function signalSetMaxAveragePriceChange(uint256 _maxAveragePriceChange) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setMaxAveragePriceChange", _maxAveragePriceChange));
        _setPendingAction(action);

        emit SignalSetMaxAveragePriceChange(_maxAveragePriceChange);
    }

    function setMaxAveragePriceChange(uint256 _maxAveragePriceChange) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setMaxAveragePriceChange", _maxAveragePriceChange));
        _validateAction(action);
        _clearAction(action);

        maxAveragePriceChange = _maxAveragePriceChange;

        emit SetMaxAveragePriceChange(_maxAveragePriceChange);
    }

    function signalSetIsGlobalShortDataReady(IShortsTracker _shortsTracker, bool _value) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setIsGlobalShortDataReady", address(_shortsTracker), _value));
        _setPendingAction(action);

        emit SignalSetIsGlobalShortDataReady(address(_shortsTracker), _value);
    }

    function setIsGlobalShortDataReady(IShortsTracker _shortsTracker, bool _value) external onlyAdmin {
        bytes32 action = keccak256(abi.encodePacked("setIsGlobalShortDataReady", address(_shortsTracker), _value));
        _validateAction(action);
        _clearAction(action);

        _shortsTracker.setIsGlobalShortDataReady(_value);

        emit SetIsGlobalShortDataReady(address(_shortsTracker), _value);
    }

    function disableIsGlobalShortDataReady(IShortsTracker _shortsTracker) external onlyAdmin {
        _shortsTracker.setIsGlobalShortDataReady(false);

        emit SetIsGlobalShortDataReady(address(_shortsTracker), false);
    }

    function setGlobalShortAveragePrices(IShortsTracker _shortsTracker, address[] calldata _tokens, uint256[] calldata _averagePrices) external onlyHandler {
        _shortsTracker.setIsGlobalShortDataReady(false);

        for (uint256 i = 0; i < _tokens.length; i++) {
            address token = _tokens[i];
            uint256 oldAveragePrice = _shortsTracker.globalShortAveragePrices(token);
            uint256 newAveragePrice = _averagePrices[i];
            uint256 diff = newAveragePrice > oldAveragePrice ? newAveragePrice.sub(oldAveragePrice) : oldAveragePrice.sub(newAveragePrice);
            require(diff.mul(BASIS_POINTS_DIVISOR).div(oldAveragePrice) < maxAveragePriceChange, "ShortsTrackerTimelock: too big change");

            require(block.timestamp >= lastUpdated[token].add(averagePriceUpdateDelay), "ShortsTrackerTimelock: too early");
            lastUpdated[token] = block.timestamp;

            emit GlobalShortAveragePriceUpdated(token, oldAveragePrice, newAveragePrice);
        }

        _shortsTracker.setInitData(_tokens, _averagePrices);
    }

    function cancelAction(bytes32 _action) external onlyAdmin {
        _clearAction(_action);
    }

    function _setPendingAction(bytes32 _action) private {
        require(pendingActions[_action] == 0, "ShortsTrackerTimelock: action already signalled");
        pendingActions[_action] = block.timestamp.add(buffer);
        emit SignalPendingAction(_action);
    }

    function _validateAction(bytes32 _action) private view {
        require(pendingActions[_action] != 0, "ShortsTrackerTimelock: action not signalled");
        require(pendingActions[_action] <= block.timestamp, "ShortsTrackerTimelock: action time not yet passed");
    }

    function _clearAction(bytes32 _action) private {
        require(pendingActions[_action] != 0, "ShortsTrackerTimelock: invalid _action");
        delete pendingActions[_action];
        emit ClearAction(_action);
    }
}

// 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;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IHandlerTarget {
    function isHandler(address _account) external returns (bool);
    function setHandler(address _handler, bool _isActive) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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