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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "../interfaces/IChiLocking.sol";
import "../library/ExternalContractAddresses.sol";

/// @title Contract for locking CHI tokens
/// @notice This contract holds CHI tokens that are locked
/// @notice Locking of reward distribution of CHI tokens is done per epoch
contract ChiLocking is IChiLocking, OwnableUpgradeable {
  using SafeERC20 for IERC20;

  uint256 public constant MAX_LOCK_DURATION = 208; // 4 years in weeks
  IERC20 public constant stETH = IERC20(ExternalContractAddresses.stETH);

  IERC20 public chi;
  address public rewardController;
  uint256 public currentEpoch;
  uint256 public totalLockedChi;
  uint256 public totalUnlockedChi;
  uint256 public totalLockedShares;
  uint256 public totalVotingPower;
  uint256 public sumOfLockedDurations;
  uint256 public numberOfLockedPositions;
  uint256 public addVotingPowerInEpoch;
  uint256 public sumShareDurationProduct;
  uint256 public addedAmountInEpoch;

  mapping(address account => bool status) public chiLockers;
  mapping(address account => LockingData) public locks;
  mapping(uint256 id => EpochData) public epochs;

  modifier onlyRewardController() {
    if (msg.sender != rewardController) {
      revert NotRewardController();
    }
    _;
  }

  modifier onlyChiLockers() {
    if (!chiLockers[msg.sender]) {
      revert NotChiLocker();
    }
    _;
  }

  function initialize(IERC20 _chi, address _chiStaking) external initializer {
    __Ownable_init();
    chiLockers[_chiStaking] = true;
    chi = _chi;
    currentEpoch = 1;
  }

  /// @inheritdoc IChiLocking
  function setUscStaking(address _uscStaking) external onlyOwner {
    chiLockers[_uscStaking] = true;
    emit SetUscStaking(_uscStaking);
  }

  /// @inheritdoc IChiLocking
  function setRewardController(address _rewardController) external onlyOwner {
    rewardController = _rewardController;
    emit SetRewardController(_rewardController);
  }

  /// @inheritdoc IChiLocking
  function setChiLocker(address contractAddress, bool toSet) external onlyOwner {
    chiLockers[contractAddress] = toSet;
    emit SetChiLocker(contractAddress, toSet);
  }

  /// @inheritdoc IChiLocking
  function getLockedPosition(address account, uint256 pos) external view returns (LockedPosition memory) {
    return locks[account].positions[pos];
  }

  function getAllLockedPositions(address account) external view returns (AllLockedPositionsOutput[] memory out) {
    LockingData storage lockData = locks[account];

    out = new AllLockedPositionsOutput[](lockData.positions.length);

    for (uint256 i = 0; i < lockData.positions.length; i++) {
      LockedPosition storage position = lockData.positions[i];
      out[i].position = position;
      out[i].votingPower = _getCurrentVotingPowerForPosition(position);
      out[i].stETHreward = _getUnclaimedStETHPositionAmount(lockData.positions[i], lockData.lastUpdatedEpoch);
      out[i].totalAccumulatedChi = _totalAccumulatedAtEpoch(currentEpoch, lockData.positions[i]);
      out[i].totalChiRewards = (out[i].totalAccumulatedChi > position.amount)
        ? out[i].totalAccumulatedChi - position.amount
        : 0;
    }
  }

  /// @inheritdoc IChiLocking
  function getStakedChi() public view returns (uint256) {
    return totalLockedChi + totalUnlockedChi;
  }

  /// @inheritdoc IChiLocking
  function getLockedChi() public view returns (uint256) {
    return totalLockedChi;
  }

  /// @inheritdoc IChiLocking
  function getTotalVotingPower() external view returns (uint256) {
    return totalVotingPower;
  }

  /// @inheritdoc IChiLocking
  function availableChiWithdraw(address account) public view returns (uint256 availableTotal) {
    LockingData storage lockData = locks[account];
    for (uint256 i = 0; i < lockData.positions.length; i++) {
      availableTotal += _availableToWithdrawFromPosition(lockData.positions[i]);
    }
  }

  /// @inheritdoc IChiLocking
  function lockChi(address account, uint256 amount, uint256 duration) external onlyChiLockers {
    if (amount == 0) {
      revert ZeroAmount();
    }

    uint256 shares = _getNumberOfShares(amount);
    duration++;

    EpochData storage currentEpochData = epochs[currentEpoch];
    EpochData storage afterEndEpoch = epochs[currentEpoch + duration];

    locks[account].positions.push(
      LockedPosition({
        amount: amount,
        startEpoch: currentEpoch,
        duration: duration,
        shares: shares,
        withdrawnChiAmount: 0
      })
    );

    totalLockedChi += amount;
    totalLockedShares += shares;
    currentEpochData.lockedSharesInEpoch += shares;
    currentEpochData.totalLockedChiInEpoch += amount;
    afterEndEpoch.sharesToUnlock += shares;

    totalVotingPower += Math.mulDiv(amount, duration, MAX_LOCK_DURATION);
    sumShareDurationProduct += Math.mulDiv(shares, duration, MAX_LOCK_DURATION);
    sumOfLockedDurations += duration + 1;
    numberOfLockedPositions += 1;
    afterEndEpoch.numberOfEndingPositions += 1;

    emit LockChi(account, amount, shares, currentEpoch, currentEpoch + duration);
  }

  /// @inheritdoc IChiLocking
  function updateEpoch(uint256 chiEmissions, uint256 stETHrewards) external onlyRewardController {
    EpochData storage epoch = epochs[currentEpoch];

    uint256 stETHrewardsForLocked;
    uint256 stakedChi = getStakedChi();
    if (stakedChi != 0) {
      stETHrewardsForLocked = Math.mulDiv(stETHrewards, totalLockedChi, stakedChi);
    }
    uint256 stETHrewardsForUnlocked = stETHrewards - stETHrewardsForLocked;

    uint256 stEthPerLockedShare;
    if (epoch.lockedSharesInEpoch != 0) {
      stEthPerLockedShare = Math.mulDiv(stETHrewardsForLocked, 1e18, epoch.lockedSharesInEpoch);
    }
    epoch.cumulativeStETHPerLockedShare = epochs[currentEpoch - 1].cumulativeStETHPerLockedShare + stEthPerLockedShare;

    uint256 stEthPerUnlocked;
    if (totalUnlockedChi != 0) {
      stEthPerUnlocked = Math.mulDiv(stETHrewardsForUnlocked, 1e18, totalUnlockedChi);
    }

    epoch.cumulativeStETHPerUnlocked = epochs[currentEpoch - 1].cumulativeStETHPerUnlocked + stEthPerUnlocked;

    totalVotingPower -= totalLockedChi / MAX_LOCK_DURATION;
    sumShareDurationProduct -= totalLockedShares / MAX_LOCK_DURATION;

    if (totalLockedShares != 0) {
      totalVotingPower += Math.mulDiv(chiEmissions, sumShareDurationProduct, totalLockedShares);
    }

    totalLockedChi += chiEmissions;
    epoch.totalLockedChiInEpoch += chiEmissions;

    EpochData storage nextEpoch = epochs[currentEpoch + 1];

    uint256 amountToUnlock;
    if (totalLockedShares != 0) {
      amountToUnlock = Math.mulDiv(epoch.totalLockedChiInEpoch, nextEpoch.sharesToUnlock, epoch.lockedSharesInEpoch);
    }

    totalLockedChi = totalLockedChi - amountToUnlock;
    totalUnlockedChi = totalUnlockedChi + amountToUnlock;
    totalLockedShares -= nextEpoch.sharesToUnlock;

    nextEpoch.lockedSharesInEpoch = totalLockedShares;
    nextEpoch.totalLockedChiInEpoch = totalLockedChi;

    currentEpoch++;
    emit UpdateEpoch(currentEpoch - 1, totalLockedChi, chiEmissions, stETHrewards, stEthPerLockedShare);
  }

  /// @inheritdoc IChiLocking
  function claimStETH(address account) external onlyRewardController returns (uint256 amount) {
    _updateUnclaimedStETH(account);
    amount = locks[account].unclaimedStETH;
    locks[account].unclaimedStETH = 0;

    emit ClaimStETH(account, amount);
  }

  /// @inheritdoc IChiLocking
  function withdrawChiFromAccount(address account, uint256 amount) public onlyChiLockers {
    withdrawChiFromAccountToAddress(account, account, amount);
  }

  /// @inheritdoc IChiLocking
  function withdrawChiFromAccountToAddress(address account, address toAddress, uint256 amount) public onlyChiLockers {
    if (amount == 0) {
      return;
    }

    _updateUnclaimedStETH(account);

    uint256 toWithdraw = amount;

    LockingData storage lockData = locks[account];

    uint256 pos = 0;
    while (toWithdraw > 0) {
      if (pos >= lockData.positions.length) {
        revert UnavailableWithdrawAmount(amount);
      }

      LockedPosition storage position = lockData.positions[pos];

      if (currentEpoch < position.startEpoch + position.duration) {
        pos++;
      } else {
        uint256 availableToWithdraw = _availableToWithdrawFromPosition(position);

        if (availableToWithdraw > toWithdraw) {
          position.withdrawnChiAmount += toWithdraw;
          toWithdraw = 0;
        } else {
          position.withdrawnChiAmount += toWithdraw;
          toWithdraw -= availableToWithdraw;
          _removePosition(lockData, pos);
        }
      }
    }

    totalUnlockedChi -= amount;
    chi.safeTransfer(toAddress, amount);

    emit WithdrawChiFromAccount(account, toAddress, amount);
  }

  /// @inheritdoc IChiLocking
  function unclaimedStETHAmount(address account) public view returns (uint256 totalAmount) {
    LockingData storage lockData = locks[account];
    totalAmount = lockData.unclaimedStETH;
    if (lockData.lastUpdatedEpoch == currentEpoch) return totalAmount;

    for (uint256 i = 0; i < lockData.positions.length; i++) {
      totalAmount += _getUnclaimedStETHPositionAmount(lockData.positions[i], lockData.lastUpdatedEpoch);
    }
  }

  /// @inheritdoc IChiLocking
  function getVotingPower(address account) public view returns (uint256) {
    uint256 votingPower = 0;
    LockingData storage lockData = locks[account];
    for (uint256 i = 0; i < lockData.positions.length; i++) {
      votingPower += _getCurrentVotingPowerForPosition(lockData.positions[i]);
    }
    return votingPower;
  }

  function _getNumberOfShares(uint256 chiAmount) internal view returns (uint256) {
    if (totalLockedChi == 0) return chiAmount;
    return Math.mulDiv(chiAmount, totalLockedShares, totalLockedChi);
  }

  function _updateUnclaimedStETH(address account) internal {
    locks[account].unclaimedStETH = unclaimedStETHAmount(account);
    locks[account].lastUpdatedEpoch = currentEpoch;
  }

  function _getUnclaimedStETHPositionAmount(
    LockedPosition storage position,
    uint256 lastUpdated
  ) internal view returns (uint256 unclaimedAmount) {
    if (lastUpdated == currentEpoch) return 0;

    uint256 fromEpoch = lastUpdated < position.startEpoch ? position.startEpoch : lastUpdated;
    uint256 toEpoch = currentEpoch - 1;

    uint256 lockEndsInEpoch = position.startEpoch + position.duration - 1;
    if (fromEpoch <= lockEndsInEpoch) {
      if (toEpoch <= lockEndsInEpoch) {
        unclaimedAmount += _unclaiemdStETHDuringLocked(position, fromEpoch, toEpoch);
        return unclaimedAmount;
      } else {
        unclaimedAmount += _unclaiemdStETHDuringLocked(position, fromEpoch, lockEndsInEpoch);
      }

      fromEpoch = lockEndsInEpoch + 1;
    }

    unclaimedAmount += _unclaiemdStETHAfterLocked(position, fromEpoch, toEpoch);
  }

  function _unclaiemdStETHDuringLocked(
    LockedPosition storage position,
    uint256 fromEpoch,
    uint256 toEpoch
  ) internal view returns (uint256) {
    uint256 rewardPerShare = epochs[toEpoch].cumulativeStETHPerLockedShare -
      epochs[fromEpoch - 1].cumulativeStETHPerLockedShare;

    return Math.mulDiv(rewardPerShare, position.shares, 1e18);
  }

  function _unclaiemdStETHAfterLocked(
    LockedPosition storage position,
    uint256 fromEpoch,
    uint256 toEpoch
  ) internal view returns (uint256) {
    uint256 unlockedChiAmount = _availableToWithdrawFromPosition(position);
    uint256 rewardPerChi = epochs[toEpoch].cumulativeStETHPerUnlocked -
      epochs[fromEpoch - 1].cumulativeStETHPerUnlocked;
    return Math.mulDiv(rewardPerChi, unlockedChiAmount, 1e18);
  }

  function _getCurrentVotingPowerForPosition(LockedPosition storage position) internal view returns (uint256) {
    if (currentEpoch >= position.startEpoch + position.duration || currentEpoch < position.startEpoch) return 0;
    uint256 epochsUntilEnd = position.startEpoch + position.duration - currentEpoch;

    if (currentEpoch == position.startEpoch) {
      return Math.mulDiv(position.amount, epochsUntilEnd, MAX_LOCK_DURATION);
    } else {
      return Math.mulDiv(_totalAccumulatedAtEpoch(currentEpoch - 1, position), epochsUntilEnd, MAX_LOCK_DURATION);
    }
  }

  function _availableToWithdrawFromPosition(LockedPosition storage position) internal view returns (uint256) {
    uint256 endLockingEpoch = position.startEpoch + position.duration - 1;
    if (currentEpoch <= endLockingEpoch) return 0;
    return _totalAccumulatedAtEpoch(endLockingEpoch, position) - position.withdrawnChiAmount;
  }

  function _totalAccumulatedAtEpoch(uint256 epochNum, LockedPosition storage position) internal view returns (uint256) {
    uint256 endEpoch = position.startEpoch + position.duration - 1;
    if (endEpoch < epochNum) epochNum = endEpoch;

    EpochData storage epoch = epochs[epochNum];
    return Math.mulDiv(position.shares, epoch.totalLockedChiInEpoch, epoch.lockedSharesInEpoch);
  }

  function _removePosition(LockingData storage lockData, uint256 pos) internal {
    lockData.positions[pos] = lockData.positions[lockData.positions.length - 1];
    lockData.positions.pop();
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IChiLocking {
  struct LockedPosition {
    uint256 amount;
    uint256 startEpoch;
    uint256 duration; // in epochs
    uint256 shares;
    uint256 withdrawnChiAmount;
  }

  struct LockingData {
    uint256 lastUpdatedEpoch;
    uint256 unclaimedStETH;
    LockedPosition[] positions;
  }

  struct AllLockedPositionsOutput {
    LockedPosition position;
    uint256 votingPower;
    uint256 stETHreward;
    uint256 totalAccumulatedChi;
    uint256 totalChiRewards;
  }

  struct EpochData {
    uint256 lockedSharesInEpoch;
    uint256 totalLockedChiInEpoch;
    uint256 sharesToUnlock;
    uint256 cumulativeStETHPerLockedShare;
    uint256 cumulativeStETHPerUnlocked;
    uint256 numberOfEndingPositions;
  }

  event SetUscStaking(address indexed uscStaking);
  event SetRewardController(address indexed rewardController);
  event SetChiLocker(address indexed chiLocker, bool indexed status);
  event LockChi(address indexed account, uint256 amount, uint256 shares, uint256 startEpoch, uint256 endEpoch);
  event UpdateEpoch(
    uint256 indexed epoch,
    uint256 totalLockedChi,
    uint256 chiEmissions,
    uint256 stETHrewards,
    uint256 stEthPerLockedShare
  );
  event ClaimStETH(address indexed account, uint256 amount);
  event WithdrawChiFromAccount(address indexed account, address indexed toAddress, uint256 amount);

  error ZeroAmount();
  error NotRewardController();
  error NotChiLocker();
  error UnavailableWithdrawAmount(uint256 amount);

  /// @notice Sets address of uscStaking contract
  /// @param _uscStaking Address of uscStaking contract
  function setUscStaking(address _uscStaking) external;

  /// @notice Sets address of rewardController contract
  /// @param _rewardController Address of rewardController contract
  function setRewardController(address _rewardController) external;

  /// @notice Sets address of contract who can call lock function
  /// @param contractAddress Address of contract who calles lock function, chiStaking currently
  /// @param toSet true if contract can call lock function, false otherwise
  function setChiLocker(address contractAddress, bool toSet) external;

  /// @notice Gets locked position for given account and position index
  /// @param account Account to get locked position for
  /// @param pos Index of locked position
  /// @return position Locked position
  function getLockedPosition(address account, uint256 pos) external view returns (LockedPosition memory position);

  /// @notice Gets all locked position for given account
  /// @param account Account to get locked positions
  /// @return out Array of locked positions
  function getAllLockedPositions(address account) external view returns (AllLockedPositionsOutput[] memory out);

  /// @notice Gets total staked chi amount, locked amount is also considered staked
  /// @return stakedChi Total staked chi amount
  function getStakedChi() external view returns (uint256 stakedChi);

  /// @notice Gets total locked chi amount
  /// @return lockedChi Total locked chi amount
  function getLockedChi() external view returns (uint256 lockedChi);

  /// @notice Gets total voting power
  /// @return totalVotingPower Total voting power
  function getTotalVotingPower() external view returns (uint256 totalVotingPower);

  /// @notice Gets total chi amount that is available to withdraw for given account
  /// @param account Account to get available chi amount for
  /// @return availableTotal Total amount of chi that is available to withdraw
  function availableChiWithdraw(address account) external view returns (uint256 availableTotal);

  /// @notice Locks given amount of chi for given account for given duration
  /// @param account Account to lock chi for
  /// @param amount Amount of chi to lock
  /// @param duration Duration of locking in epochs
  /// @custom:usage This function should be called from chiStaking and uscStaking contracts in purpose of locking chi
  function lockChi(address account, uint256 amount, uint256 duration) external;

  /// @notice Updates epoch data
  /// @param chiEmissions Amount of chi incentives for chi lockers that is emitted in current epoch
  /// @param stETHrewards Amount of stETH rewards for chi lockers that is emitted in current epoch
  /// @custom:usage This function should be called from rewardController contract in purpose of updating epoch data
  function updateEpoch(uint256 chiEmissions, uint256 stETHrewards) external;

  /// @notice Claims stETH rewards for given account
  /// @notice This contract does not send stETH rewards nor holds them, reserveHolder does that
  /// @notice This contract only calculates and updates unclaimed stETH amount for given account
  /// @param account Account to claim stETH rewards for
  /// @return amount Amount of stETH rewards that user can claim
  /// @custom:usage This function should be called from rewardController contract in purpose of claiming stETH rewards
  function claimStETH(address account) external returns (uint256 amount);

  /// @notice Withdraws given amount of unlocked chi tokens for given account, sends to account by default
  /// @notice This contract hold CHI tokens and inside this function sends them back to user
  /// @param account Account to withdraw CHI for
  /// @param amount Amount of CHI tokens to withdraw
  /// @custom:usage This function should be called from chiStaking contract in purpose of withdrawing CHI tokens
  function withdrawChiFromAccount(address account, uint256 amount) external;

  /// @notice Withdraws given amount of unlocked chi tokens for given account, sends to account by default
  /// @notice This contract hold CHI tokens and inside this function sends them back to user
  /// @param account Account to withdraw CHI for
  /// @param toAddress Address to which to send tokens
  /// @param amount Amount of CHI tokens to withdraw
  /// @custom:usage This function should be called from chiStaking contract in purpose of withdrawing CHI tokens
  function withdrawChiFromAccountToAddress(address account, address toAddress, uint256 amount) external;

  /// @notice Calculates and returns unclaimed stETH amount for given account
  /// @param account Account to calculate unclaimed stETH amount for
  /// @return totalAmount Total amount of unclaimed stETH for given account
  function unclaimedStETHAmount(address account) external view returns (uint256 totalAmount);

  /// @notice Calculates and returns voting power for given account
  /// @param account Account to calculate voting power for
  /// @return votingPower Voting power for given account
  function getVotingPower(address account) external view returns (uint256 votingPower);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice external contract addresses on Ethereum Mainnet
library ExternalContractAddresses {
  address public constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
  address public constant stETH = 0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84;
  address public constant UNI_V2_SWAP_ROUTER = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
  address public constant UNI_V2_POOL_FACTORY = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f;
  address public constant ETH_USD_CHAINLINK_FEED = 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419;
  address public constant STETH_USD_CHAINLINK_FEED = 0xCfE54B5cD566aB89272946F602D76Ea879CAb4a8;
  address public constant CURVE_ETH_STETH_POOL = 0xDC24316b9AE028F1497c275EB9192a3Ea0f67022;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "viaIR": true,
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"chiLockers","outputs":[{"internalType":"bool","name":"status","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"claimStETH","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentEpoch","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"epochs","outputs":[{"internalType":"uint256","name":"lockedSharesInEpoch","type":"uint256"},{"internalType":"uint256","name":"totalLockedChiInEpoch","type":"uint256"},{"internalType":"uint256","name":"sharesToUnlock","type":"uint256"},{"internalType":"uint256","name":"cumulativeStETHPerLockedShare","type":"uint256"},{"internalType":"uint256","name":"cumulativeStETHPerUnlocked","type":"uint256"},{"internalType":"uint256","name":"numberOfEndingPositions","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getAllLockedPositions","outputs":[{"components":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"startEpoch","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"},{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"withdrawnChiAmount","type":"uint256"}],"internalType":"struct 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IChiLocking.AllLockedPositionsOutput[]","name":"out","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLockedChi","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"pos","type":"uint256"}],"name":"getLockedPosition","outputs":[{"components":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"startEpoch","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"},{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"withdrawnChiAmount","type":"uint256"}],"internalType":"struct IChiLocking.LockedPosition","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getStakedChi","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalVotingPower","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getVotingPower","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_chi","type":"address"},{"internalType":"address","name":"_chiStaking","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"lockChi","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"locks","outputs":[{"internalType":"uint256","name":"lastUpdatedEpoch","type":"uint256"},{"internalType":"uint256","name":"unclaimedStETH","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"numberOfLockedPositions","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardController","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"bool","name":"toSet","type":"bool"}],"name":"setChiLocker","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardController","type":"address"}],"name":"setRewardController","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_uscStaking","type":"address"}],"name":"setUscStaking","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stETH","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sumOfLockedDurations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sumShareDurationProduct","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalLockedChi","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalLockedShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalUnlockedChi","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalVotingPower","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"unclaimedStETHAmount","outputs":[{"internalType":"uint256","name":"totalAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"chiEmissions","type":"uint256"},{"internalType":"uint256","name":"stETHrewards","type":"uint256"}],"name":"updateEpoch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawChiFromAccount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"address","name":"toAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawChiFromAccountToAddress","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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