// File: contracts/proxy/TradingHub.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "../proxy/TitanProxy.sol";
import "../storage/TradingStorage.sol";

contract TradingHub is TitanProxy, TradingStorage {
    constructor(address _SAVIOR, address _implementationContract) public TitanProxy(_SAVIOR, _implementationContract) {}
}

// File: contracts/proxy/TitanProxy.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "../criteria/ChainSchema.sol";
import "./UpgradeabilityProxy.sol";

/// @notice Top level proxy for delegate
contract TitanProxy is ChainSchema, UpgradeabilityProxy {
    event Upgraded(uint256 indexed version, address indexed implementation);

    constructor(address _SAVIOR, address implementationContract) public ChainSchema(_SAVIOR) UpgradeabilityProxy(implementationContract) {}

    function version() public view returns (uint256) {
        return _version();
    }

    function implementation() external view returns (address) {
        return _implementation();
    }

    function upgradeTo(uint256 newVersion, address newImplementation) external isSavior {
        _upgradeTo(newVersion, newImplementation);
        emit Upgraded(newVersion, newImplementation);
    }

    function setSecondsPerBlock(uint256 newSecondsPerBlock) external isKeeper {
        _secondsPerBlock = newSecondsPerBlock;
    }

    receive() external payable {}
}

// File: contracts/storage/TradingStorage.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "../interfaces/uniswapv2/IUniswapV2Router02.sol";
import "../interfaces/IDexCenter.sol";
import "../interfaces/ISRC20.sol";
import "../interfaces/v1/IPoolGuardian.sol";
import "../interfaces/v1/ITradingHub.sol";
import "../interfaces/v1/model/IPoolRewardModel.sol";
import "../oracles/IPriceOracle.sol";
import "./TitanCoreStorage.sol";
import "../util/EnumerableMap.sol";

contract TradingStorage is TitanCoreStorage {
    struct PoolInfo {
        address creator;
        ISRC20 stakedToken;
        ISRC20 stableToken;
        address strToken;
        // Leverage
        uint256 leverage;
        // Optional if the pool is marked as never expires(perputual)
        uint256 durationDays;
        // Pool creation block number
        uint256 startBlock;
        // Pool expired block number
        uint256 endBlock;
        uint256 id;
        uint256 stakedTokenDecimals;
        uint256 stableTokenDecimals;
        // Listed or not
        IPoolGuardian.PoolStatus stateFlag;
    }

    struct PoolStats {
        uint256 opens;
        uint256 legacies;
        uint256 closings;
        uint256 ends;
    }

    struct PositionCube {
        address addr;
        uint64 poolId;
    }

    struct PositionBlock {
        uint256 openBlock;
        uint256 closingBlock;
        uint256 overdrawnBlock;
        uint256 closedBlock;
        uint256 lastSellBlock;
    }

    struct PositionIndex {
        uint64 poolId;
        address strToken;
        uint256 positionState;
    }

    bool internal _initialized;
    uint256 public allPositionSize;
    IDexCenter public dexCenter;
    IPoolGuardian public poolGuardian;
    IPriceOracle public priceOracle;

    mapping(uint256 => mapping(address => uint256)) userReentrantLocks;

    mapping(uint256 => PoolStats) public poolStatsMap;

    mapping(uint256 => address) public allPositions;
    mapping(address => mapping(uint256 => PositionCube)) public userPositions;
    mapping(address => uint256) public userPositionSize;

    mapping(uint256 => mapping(uint256 => address)) public poolPositions;
    mapping(uint256 => uint256) public poolPositionSize;

    mapping(address => PositionIndex) public positionInfoMap;
    mapping(address => PositionBlock) public positionBlocks;
}

// File: contracts/criteria/ChainSchema.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "@openzeppelin/contracts/utils/Pausable.sol";
import "./Affinity.sol";

/// @notice Configuration meters for various chain deployment
/// @author IPI Labs
contract ChainSchema is Affinity, Pausable {
    bool private _initialized;

    string internal _chainShortName;
    string internal _chainFullName;
    uint256 internal _blocksPerDay;
    uint256 internal _secondsPerBlock;

    constructor(address _SAVIOR) public Affinity(_SAVIOR) {}

    event ChainConfigured(address indexed self, string indexed shortName, string fullName, uint256 secondsPerBlock);

    modifier chainReady() {
        require(_initialized, "ChainSchema: To be configured");
        _;
    }

    function configChain(
        string memory shortName,
        string memory fullName,
        uint256 secondsPerBlock
    ) external isSavior {
        require(!_initialized, "ChainSchema: Reconfiguration is not allowed");
        require(secondsPerBlock > 0, "ChainSchema: Invalid secondsPerBlock");

        _chainShortName = shortName;
        _chainFullName = fullName;
        _blocksPerDay = uint256(24 * 60 * 60) / secondsPerBlock;
        _secondsPerBlock = secondsPerBlock;
        _initialized = true;

        emit ChainConfigured(address(this), shortName, fullName, secondsPerBlock);
    }

    function chainShortName() external view returns (string memory) {
        return _chainShortName;
    }

    function chainFullName() external view returns (string memory) {
        return _chainFullName;
    }

    function blocksPerDay() public view returns (uint256) {
        return _blocksPerDay;
    }

    function secondsPerBlock() public view returns (uint256) {
        return _secondsPerBlock;
    }

    function pause() external isKeeper {
        _pause();
    }

    function unpause() external isKeeper {
        _unpause();
    }

    function getChainId() public pure returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}

// File: contracts/proxy/UpgradeabilityProxy.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import {Address} from "@openzeppelin/contracts/utils/Address.sol";
import {Proxy} from "./Proxy.sol";

contract UpgradeabilityProxy is Proxy {
    bytes32 internal constant IMPLEMENTATION_SLOT = 0xb4cff3ccade8876c60e81b90f014ea636f99d530646ec67090e1cc8a04636f38;
    bytes32 internal constant VERSION_SLOT = 0xf62412ce1bd823aa31864380419f787378380edf34602844461eeadf8416d534;

    constructor(address implementationContract) public {
        assert(IMPLEMENTATION_SLOT == keccak256("com.ipilabs.proxy.implementation"));

        assert(VERSION_SLOT == keccak256("com.ipilabs.proxy.version"));

        _upgradeTo(1, implementationContract);
    }

    function _implementation() internal view override returns (address impl) {
        bytes32 slot = IMPLEMENTATION_SLOT;
        assembly {
            impl := sload(slot)
        }
    }

    function _version() internal view returns (uint256 version) {
        bytes32 slot = VERSION_SLOT;
        assembly {
            version := sload(slot)
        }
    }

    function _upgradeTo(uint256 newVersion, address newImplementation) internal {
        require(Address.isContract(newImplementation), "Non-contract address");

        _setImplementation(newImplementation);
        _setVersion(newVersion);
    }

    function _setImplementation(address newImplementation) internal {
        require(Address.isContract(newImplementation), "Non-contract address");

        bytes32 slot = IMPLEMENTATION_SLOT;

        assembly {
            sstore(slot, newImplementation)
        }
    }

    function _setVersion(uint256 newVersion) internal {
        bytes32 slot = VERSION_SLOT;

        assembly {
            sstore(slot, newVersion)
        }
    }
}

// File: contracts/criteria/Affinity.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "../interfaces/ISRC20.sol";
import "../interfaces/IUSDT.sol";
import "./IAffinity.sol";

/// @notice Arch design for roles and privileges management
contract Affinity is AccessControl, IAffinity {
    address public SAVIOR;

    /// @notice Initial bunch of roles
    bytes32 public constant ROOT_GROUP = keccak256("ROOT_GROUP");
    bytes32 public constant KEEPER_ROLE = keccak256("KEEPER_ROLE");
    bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE");
    bytes32 public constant ALLY_ROLE = keccak256("ALLY_ROLE");

    modifier isSavior() {
        require(msg.sender == SAVIOR, "Affinity: Caller is not the Savior");
        _;
    }

    modifier isKeeper() {
        require(hasRole(KEEPER_ROLE, msg.sender), "Affinity: Caller is not keeper");
        _;
    }

    modifier isManager() {
        require(hasRole(MANAGER_ROLE, msg.sender), "Affinity: Caller is not manager");
        _;
    }

    modifier onlyEOA() {
        require(msg.sender == tx.origin, "Affinity: EOA required");
        _;
    }

    constructor(address _SAVIOR) public {
        SAVIOR = _SAVIOR;

        _setupRole(ROOT_GROUP, _SAVIOR);

        _setRoleAdmin(KEEPER_ROLE, ROOT_GROUP);
        _setRoleAdmin(MANAGER_ROLE, ROOT_GROUP);
        _setRoleAdmin(ALLY_ROLE, ROOT_GROUP);
    }

    function transferSavior(address multiSigWallet) external isSavior {
        require(multiSigWallet != address(0), "Affinity: Account is zero address");
        require(Address.isContract(multiSigWallet), "Affinity: EOA is not allowed");
        require(SAVIOR != multiSigWallet, "Affinity: Nonsense");
        SAVIOR = multiSigWallet;
        _setupRole(ROOT_GROUP, multiSigWallet);
        renounceRole(ROOT_GROUP, msg.sender);
    }

    function allow(
        address token,
        address spender,
        uint256 amount
    ) external override isSavior {
        ISRC20(token).approve(spender, amount);
    }

    function allowTetherToken(
        address token,
        address spender,
        uint256 amount
    ) external override isSavior {
        _allowTetherToken(token, spender, amount);
    }

    function _allowTetherToken(
        address token,
        address spender,
        uint256 amount
    ) internal {
        IUSDT USDT = IUSDT(token);
        uint256 _allowance = USDT.allowance(address(this), spender);
        if (_allowance >= amount) {
            return;
        }

        if (_allowance > 0) {
            USDT.approve(spender, 0);
        }
        USDT.approve(spender, amount);
    }
}

// File: @openzeppelin/contracts/utils/Pausable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";

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

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

    bool private _paused;

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

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

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

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

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

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

// File: contracts/interfaces/ISRC20.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @dev Enhanced IERC20 interface
interface ISRC20 is IERC20 {
    /**
     * @dev Returns the token symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the token name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token decimals.
     */
    function decimals() external view returns (uint8);
}

// File: contracts/interfaces/IUSDT.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

/// @dev Enhanced IERC20 interface
interface IUSDT {
    function approve(address spender, uint256 amount) external;

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external;

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

// File: contracts/criteria/IAffinity.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

/// @notice Interface of Affinity
interface IAffinity {
    function allow(
        address token,
        address spender,
        uint256 amount
    ) external;

    function allowTetherToken(
        address token,
        address spender,
        uint256 amount
    ) external;
}

// File: @openzeppelin/contracts/access/AccessControl.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/EnumerableSet.sol";
import "../utils/Address.sol";
import "../utils/Context.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/utils/EnumerableSet.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

// File: contracts/proxy/Proxy.sol



/**
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2018 zOS Global Limited.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

pragma solidity 0.6.12;

/**
 * @notice Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 * @dev Forked from https://github.com/zeppelinos/zos-lib/blob/8a16ef3ad17ec7430e3a9d2b5e3f39b8204f8c8d/contracts/upgradeability/Proxy.sol
 * Modifications:
 * 1. Reformat and conform to Solidity 0.6 syntax (5/13/20)
 */
abstract contract Proxy {
    /**
     * @dev Fallback function.
     * Implemented entirely in `_fallback`.
     */
    fallback() external payable {
        _fallback();
    }

    /**
     * @return The Address of the implementation.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates execution to an implementation contract.
     * This is a low level function that doesn't return to its internal call site.
     * It will return to the external caller whatever the implementation returns.
     * @param implementation Address to delegate.
     */
    function _delegate(address implementation) internal {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev Function that is run as the first thing in the fallback function.
     * Can be redefined in derived contracts to add functionality.
     * Redefinitions must call super._willFallback().
     */
    function _willFallback() internal virtual {}

    /**
     * @dev fallback implementation.
     * Extracted to enable manual triggering.
     */
    function _fallback() internal {
        _willFallback();
        _delegate(_implementation());
    }
}

// File: contracts/interfaces/IDexCenter.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

interface IDexCenter {
    struct SellShortParams {
        bool isSwapRouterV3;
        uint256 amountIn;
        uint256 amountOutMin;
        address swapRouter;
        address to;
        bytes path;
    }

    struct BuyCoverParams {
        bool isSwapRouterV3;
        bool isTetherToken;
        uint256 amountOut;
        uint256 amountInMax;
        address swapRouter;
        address to;
        bytes path;
    }

    function entitledSwapRouters(address swapRouter) external view returns (bool);

    function isSwapRouterV3(address swapRouter) external view returns (bool);

    function checkPath(
        address token0,
        address token1,
        address swapRouter,
        bool isSell,
        bytes memory path
    ) external;

    function getTokenPrice(
        address swapRouter,
        address[] memory path,
        uint24[] memory fees
    ) external view returns (uint256 price);
}

// File: contracts/oracles/IPriceOracle.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

/// @notice Interface of PriceOracle
interface IPriceOracle {
    enum PriceOracleMode {
        DEX_MODE,
        CHAINLINK_MODE,
        FEED_MODE
    }

    function getLatestMixinPrice(address tokenAddr) external view returns (uint256 tokenPrice);
}

// File: contracts/storage/TitanCoreStorage.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "../interfaces/IShorterBone.sol";

/// @notice Storage for TitanProxy with update information
contract TitanCoreStorage {
    IShorterBone internal shorterBone;
}

// File: contracts/util/EnumerableMap.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap internal myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 * Amended: Juu17 on 2020/05/03
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses internal functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;
        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(
        Map storage map,
        bytes32 key,
        bytes32 value
    ) internal returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) {
            // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({_key: key, _value: value}));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function _remove(Map storage map, bytes32 key) internal returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) {
            // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function _contains(Map storage map, bytes32 key) internal view returns (bool) {
        return map._indexes[key] != 0;
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) internal view returns (uint256) {
        return map._entries.length;
    }

    /**
     * @dev Returns the key-value pair stored at position `index` in the map. O(1).
     *
     * Note that there are no guarantees on the ordering of entries inside the
     * array, and it may change when more entries are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Map storage map, uint256 index) internal view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) internal view returns (bytes32) {
        return _get(map, key, "EnumerableMap: nonexistent key");
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function _get(
        Map storage map,
        bytes32 key,
        string memory errorMessage
    ) internal view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        UintToAddressMap storage map,
        uint256 key,
        address value
    ) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint256(value)));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(
        UintToAddressMap storage map,
        uint256 key,
        string memory errorMessage
    ) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
    }

    // AddressToUintMap   - added on 20200830
    struct AddressToUintMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        AddressToUintMap storage map,
        address key,
        uint256 value
    ) internal returns (bool) {
        return _set(map._inner, bytes32(uint256(key)), bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(AddressToUintMap storage map, address key) internal returns (bool) {
        return _remove(map._inner, bytes32(uint256(key)));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(AddressToUintMap storage map, address key) internal view returns (bool) {
        return _contains(map._inner, bytes32(uint256(key)));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(AddressToUintMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressToUintMap storage map, uint256 index) internal view returns (address, uint256) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (address(uint256(key)), uint256(value));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(AddressToUintMap storage map, address key) internal view returns (uint256) {
        return uint256(_get(map._inner, bytes32(uint256(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(
        AddressToUintMap storage map,
        address key,
        string memory errorMessage
    ) internal view returns (uint256) {
        return uint256(_get(map._inner, bytes32(uint256(key)), errorMessage));
    }

    // UintToUintMap   - added  20200919
    struct UintToUintMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        UintToUintMap storage map,
        uint256 key,
        uint256 value
    ) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToUintMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToUintMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToUintMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintToUintMap storage map, uint256 index) internal view returns (uint256, uint256) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), uint256(value));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToUintMap storage map, uint256 key) internal view returns (uint256) {
        return uint256(_get(map._inner, bytes32(key)));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(
        UintToUintMap storage map,
        uint256 key,
        string memory errorMessage
    ) internal view returns (uint256) {
        return uint256(_get(map._inner, bytes32(key), errorMessage));
    }

    // AddressToBytes8Map   - added  202010/26
    struct AddressToBytes8Map {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        AddressToBytes8Map storage map,
        address key,
        bytes8 value
    ) internal returns (bool) {
        return _set(map._inner, bytes32(uint256(key)), bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(AddressToBytes8Map storage map, address key) internal returns (bool) {
        return _remove(map._inner, bytes32(uint256(key)));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(AddressToBytes8Map storage map, address key) internal view returns (bool) {
        return _contains(map._inner, bytes32(uint256(key)));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(AddressToBytes8Map storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressToBytes8Map storage map, uint256 index) internal view returns (address, bytes8) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (address(uint256(key)), bytes8(value));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(AddressToBytes8Map storage map, address key) internal view returns (bytes8) {
        return bytes8(_get(map._inner, bytes32(uint256(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(
        AddressToBytes8Map storage map,
        address key,
        string memory errorMessage
    ) internal view returns (bytes8) {
        return bytes8(_get(map._inner, bytes32(uint256(key)), errorMessage));
    }
}

// File: contracts/interfaces/uniswapv2/IUniswapV2Router02.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "./IUniswapV2Router01.sol";

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

// File: contracts/interfaces/v1/IPoolGuardian.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "../IShorterBone.sol";

/// @notice Interfaces of PoolGuardian
interface IPoolGuardian {
    enum PoolStatus {
        GENESIS,
        RUNNING,
        LIQUIDATING,
        DELIVERING,
        ENDED
    }

    function getPoolInfo(uint256 poolId)
        external
        view
        returns (
            address stakedToken,
            address strToken,
            PoolStatus stateFlag
        );

    function addPool(
        address stakedToken,
        address stableToken,
        address creator,
        uint256 leverage,
        uint256 durationDays,
        uint256 poolId
    ) external;

    function listPool(uint256 poolId) external;

    function setStateFlag(uint256 poolId, PoolStatus status) external;

    function queryPools(address stakedToken, PoolStatus status) external view returns (uint256[] memory);

    function getPoolIds() external view returns (uint256[] memory _poolIds);

    function getPoolInvokers(bytes4 _sig) external view returns (address);

    function WrappedEtherAddr() external view returns (address);

    /// @notice Emitted when this contract is deployed
    event PoolGuardianInitiated();

    event PoolStatusChanged(uint256 indexed poolId, PoolStatus poolStatus);

    event PoolInvokerChanged(address keeper, address poolInvoker, bytes4[] sigs);
}

// File: contracts/interfaces/v1/ITradingHub.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

/// @notice Interfaces of TradingHub
interface ITradingHub {
    struct BatchPositionInfo {
        uint256 poolId;
        address[] positions;
    }

    function getPositionState(address position)
        external
        view
        returns (
            uint256 poolId,
            address strToken,
            uint256 closingBlock,
            uint256 positionState
        );

    function getPoolStats(uint256 poolId)
        external
        view
        returns (
            uint256 opens,
            uint256 closings,
            uint256 legacies,
            uint256 ends
        );

    function getBatchPositionState(address[] calldata positions) external view returns (uint256[] memory positionsState);

    function getPositionsByPoolId(uint256 poolId, uint256 positionState) external view returns (address[] memory);

    function getPositionsByState(uint256 positionState) external view returns (address[] memory);

    function updatePositionState(address position, uint256 positionState) external;

    function batchUpdatePositionState(address[] calldata positions, uint256[] calldata positionsState) external;

    function isPoolWithdrawable(uint256 poolId) external view returns (bool);

    function setBatchClosePositions(BatchPositionInfo[] calldata batchPositionInfos) external;

    function executePositions(address[] calldata positions) external;

    function deliver(BatchPositionInfo[] calldata batchPositionInfos) external;

    event PositionOpened(uint256 indexed poolId, address indexed trader, address indexed positionAddr, uint256 orderSize);
    event PositionIncreased(uint256 indexed poolId, address indexed trader, address indexed positionAddr, uint256 orderSize);
    event PositionDecreased(uint256 indexed poolId, address indexed trader, address indexed positionAddr, uint256 orderSize);
    event PositionClosing(address indexed positionAddr);
    event PositionOverdrawn(address indexed positionAddr);
    event PositionClosed(address indexed positionAddr);
}

// File: contracts/interfaces/v1/model/IPoolRewardModel.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

import "../../IShorterBone.sol";
import "./IRewardModel.sol";

/// @notice Interfaces of PoolRewardModel
interface IPoolRewardModel {
    function harvest(
        address user,
        uint256[] memory stakedPools,
        uint256[] memory createPools,
        uint256[] memory votePools
    ) external returns (uint256 rewards);

    function pendingReward(address user)
        external
        view
        returns (
            uint256 stakedRewards,
            uint256 creatorRewards,
            uint256 voteRewards,
            uint256[] memory stakedPools,
            uint256[] memory createPools,
            uint256[] memory votePools
        );

    function harvestByStrToken(
        uint256 poolId,
        address user,
        uint256 amount
    ) external;
}

// File: contracts/interfaces/IShorterBone.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

interface IShorterBone {
    enum IncomeType {
        TRADING_FEE,
        FUNDING_FEE,
        PROPOSAL_FEE,
        PRIORITY_FEE,
        WITHDRAW_FEE
    }

    function poolTillIn(
        uint256 poolId,
        address token,
        address user,
        uint256 amount
    ) external;

    function poolTillOut(
        uint256 poolId,
        address token,
        address user,
        uint256 amount
    ) external;

    function poolRevenue(
        uint256 poolId,
        address user,
        address token,
        uint256 amount,
        IncomeType _type
    ) external;

    function tillIn(
        address tokenAddr,
        address caller,
        bytes32 toAllyId,
        uint256 amount
    ) external;

    function tillOut(
        address tokenAddr,
        bytes32 fromAllyId,
        address caller,
        uint256 amount
    ) external;

    function revenue(
        address tokenAddr,
        address from,
        uint256 amount,
        IncomeType _type
    ) external;

    function getAddress(bytes32 _allyId) external view returns (address);

    function mintByAlly(
        bytes32 sendAllyId,
        address user,
        uint256 amount
    ) external;

    function getTokenInfo(address token)
        external
        view
        returns (
            bool inWhiteList,
            address swapRouter,
            uint256 tokenRatingScore
        );

    function TetherToken() external view returns (address);

    /// @notice Emitted when keeper reset the ally contract
    event ResetAlly(bytes32 indexed allyId, address indexed contractAddr);
    /// @notice Emitted when keeper unregister an ally contract
    event AllyKilled(bytes32 indexed allyId);
    /// @notice Emitted when transfer fund from user to an ally contract
    event TillIn(bytes32 indexed allyId, address indexed user, address indexed tokenAddr, uint256 amount);
    /// @notice Emitted when transfer fund from an ally contract to user
    event TillOut(bytes32 indexed allyId, address indexed user, address indexed tokenAddr, uint256 amount);
    /// @notice Emitted when funds reallocated between allies
    event Revenue(address indexed tokenAddr, address indexed user, uint256 amount, IncomeType indexed _type);

    event PoolTillIn(uint256 indexed poolId, address indexed user, uint256 amount);

    event PoolTillOut(uint256 indexed poolId, address indexed user, uint256 amount);
}

// File: contracts/interfaces/uniswapv2/IUniswapV2Router01.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);
}

// File: contracts/interfaces/v1/model/IRewardModel.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity 0.6.12;

/// @notice Interfaces of BaseReward model
interface IRewardModel {
    function pendingReward(address user) external view returns (uint256 _reward);

    function harvest(address user) external returns (uint256 rewards);
}