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// SPDX-License-Identifier: MIT
pragma solidity >=0.7.2;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {IAction} from "../interfaces/IAction.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol";
import {IOldVault} from "../interfaces/IOldVault.sol";
import {IWETH} from "../interfaces/IWETH.sol";

contract OpynPerpVaultEth is
    ERC20Upgradeable,
    ReentrancyGuardUpgradeable,
    OwnableUpgradeable
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    enum VaultState {
        Locked,
        Unlocked,
        Emergency
    }

    /// @dev current state of the vault
    VaultState public state;

    /// @dev state of the vault before it was paused
    VaultState public stateBeforePause;

    /// @dev oldVault for migration
    IOldVault public oldVault;

    /// @dev 100%
    uint256 public constant BASE = 10000;

    /// @dev percentage of profits that will go to the fee recipient
    uint256 public performanceFeeInPercent = 100; // 1%

    /// @dev percentage of total asset charged as management fee every year
    uint256 public managementFeeInPercent = 0; // 0%

    /// @dev amount of asset that has been registered to be withdrawn. This amount will be reserved in the vault after the current round ends
    uint256 public withdrawQueueAmount;

    /// @dev amount of asset that has been deposited into the vault, but hasn't minted a share yet
    uint256 public pendingDeposit;

    /// @dev ERC20 asset which can be deposited into this strategy. Do not use anything but ERC20s.
    address public asset;

    /// @dev address to which all fees are sent
    address public feeRecipient;

    /// @dev actions that build up this strategy (vault)
    address[] public actions;

    /// @dev the timestamp at which the current round started
    uint256 public currentRoundStartTimestamp;

    /// @dev keep tracks of how much capital the current round start with
    uint256 public currentRoundStartingAmount;

    /// @dev cap for the vault
    uint256 public cap = 1000 ether;

    /// @dev the current round
    uint256 public round;

    /// @dev user's share in withdraw queue for a round
    mapping(address => mapping(uint256 => uint256))
        public userRoundQueuedWithdrawShares;

    /// @dev user's asset amount in deposit queue for a round
    mapping(address => mapping(uint256 => uint256))
        public userRoundQueuedDepositAmount;

    /// @dev total registered shares per round
    mapping(uint256 => uint256) public roundTotalQueuedWithdrawShares;

    /// @dev total asset recorded at end of each round
    mapping(uint256 => uint256) public roundTotalAsset;

    /// @dev total share supply recorded at end of each round
    mapping(uint256 => uint256) public roundTotalShare;

    /*=====================
     *       Events       *
     *====================*/

    event Deposit(
        address account,
        uint256 amountDeposited,
        uint256 shareMinted
    );

    event Withdraw(
        address account,
        uint256 amountWithdrawn,
        uint256 shareBurned
    );

    event WithdrawFromQueue(
        address account,
        uint256 amountWithdrawn,
        uint256 round
    );

    event Rollover(uint256[] allocations);

    event StateUpdated(VaultState state);

    event CapUpdated(uint256 newCap);

    /*=====================
     *     Modifiers      *
     *====================*/

    /**
     * @dev can only be executed in the unlocked state.
     */
    modifier onlyUnlocked() {
        require(state == VaultState.Unlocked, "!Unlocked");
        _;
    }

    /**
     * @dev can only be executed in the locked state.
     */
    modifier onlyLocked() {
        require(state == VaultState.Locked, "!Locked");
        _;
    }

    /**
     * @dev can only be executed in the unlocked state. Sets the state to 'Locked'
     */
    modifier lockState() {
        state = VaultState.Locked;
        emit StateUpdated(VaultState.Locked);
        _;
    }

    /**
     * @dev Sets the state to 'Unlocked'
     */
    modifier unlockState() {
        state = VaultState.Unlocked;
        emit StateUpdated(VaultState.Unlocked);
        _;
    }

    /**
     * @dev can only be executed if vault is not in the 'Emergency' state.
     */
    modifier notEmergency() {
        require(state != VaultState.Emergency, "Emergency");
        _;
    }

    /*=====================
     * External Functions *
     *====================*/

    /**
     * @notice function to init the vault
     * this will set the "action" for this strategy vault and won't be able to change
     * @param _asset The asset that this vault will manage. Cannot be changed after initializing.
     * @param _owner The address that will be the owner of this vault.
     * @param _feeRecipient The address to which all the fees will be sent. Cannot be changed after initializing.
     * @param _decimals of the _asset
     * @param _tokenName name of the share given to depositors of this vault
     * @param _tokenSymbol symbol of the share given to depositors of this vault
     * @param _actions array of addresses of the action contracts
     * @dev when choosing actions make sure they have similar lifecycles and expiries. if the actions can't all be closed at the
     * same time, composing them may lead to tricky interactions like user funds being stuck for longer in actions than expected.
     */
    function init(
        address _asset,
        address _owner,
        address _feeRecipient,
        uint8 _decimals,
        string memory _tokenName,
        string memory _tokenSymbol,
        address[] memory _actions,
        address _oldVault
    ) public initializer {
        __ReentrancyGuard_init();
        __ERC20_init(_tokenName, _tokenSymbol);
        _setupDecimals(_decimals);
        __Ownable_init();
        transferOwnership(_owner);

        asset = _asset;
        feeRecipient = _feeRecipient;

        // assign actions
        for (uint256 i = 0; i < _actions.length; i++) {
            // check all items before actions[i], does not equal to action[i]
            for (uint256 j = 0; j < i; j++) {
                require(_actions[i] != _actions[j], "duplicated action");
            }
            actions.push(_actions[i]);
        }

        state = VaultState.Unlocked;

        currentRoundStartTimestamp = block.timestamp;
        oldVault = IOldVault(_oldVault);
    }

    /**
     * @notice allows the owner to change the vault cap
     * @param _cap the new cap of the vault
     */
    function setCap(uint256 _cap) external onlyOwner {
        cap = _cap;
        emit CapUpdated(cap);
    }

    /**
     * @notice returns the total assets controlled by this vault, excluding pending deposit and withdraw
     */
    function totalUnderlyingControlled() external view returns (uint256) {
        return _netAssetsControlled();
    }

    /**
     * @notice returns how many shares a user can get if they deposit `_amount` of asset into the vault
     * @dev this number will change when someone registers a withdraw when the vault is locked
     * @param _amount amount of asset that the user will deposit
     */
    function getSharesByDepositAmount(uint256 _amount)
        external
        view
        returns (uint256)
    {
        return _getSharesByDepositAmount(_amount, _netAssetsControlled());
    }

    /**
     * @notice returns how much of the asset a user can get back if they burn `_shares` amount of shares. The
     * asset amount returned also takes into account fees charged.
     * @param _shares amount of shares the user will burn
     */
    function getWithdrawAmountByShares(uint256 _shares)
        external
        view
        returns (uint256)
    {
        return _getWithdrawAmountByShares(_shares);
    }

    /**
     * @notice Deposits ETH into the contract and mint vault shares.
     * @dev deposit into the weth then mint the shares to depositor, and emit the deposit event
     */
    function depositETH()
        external
        payable
        nonReentrant
        onlyUnlocked
        notEmergency
    {
        uint256 amount = msg.value;
        require(amount > 0, "O6");
        //deposit into weth
        IWETH(asset).deposit{value: amount}();
        // mint shares and emit event
        _deposit(amount);
    }

    /**
     * @notice deposits `amount` of the asset into the vault and issues shares
     * @dev deposit ERC20 asset and get shares. Direct deposits can only happen when the vault is unlocked.
     * @param _amount The amount of asset that is deposited.
     */
    function deposit(uint256 _amount) external onlyUnlocked notEmergency {
        IERC20(asset).safeTransferFrom(msg.sender, address(this), _amount);
        _deposit(_amount);
    }

    /**
     * @notice deposits `amount` of the asset into the vault without issuing shares
     * @dev deposits the ETH and turn into it to ERC20 asset and add into the pending queue. This is called when the vault is locked. Note that if
     * a user deposits before the start of the end of the current round, they will not be able to withdraw their
     * funds until the current round is over. They will also not be able to earn any premiums on their current deposit.
     */
    function registerDepositETH(address _shareRecipient)
        external
        payable
        nonReentrant
        notEmergency
        onlyLocked
    {
        uint256 amount = msg.value;
        require(amount > 0, "O6");
        //deposit into weth
        IWETH(asset).deposit{value: msg.value}();
        // mint shares and emit event
        _register(amount, _shareRecipient);
    }

    /**
     * @notice deposits `amount` of the asset into the vault without issuing shares
     * @dev deposits the ERC20 asset into the pending queue. This is called when the vault is locked. Note that if
     * a user deposits before the start of the end of the current round, they will not be able to withdraw their
     * funds until the current round is over. They will also not be able to earn any premiums on their current deposit.
     * @param _amount The amount of asset that is deposited.
     */
    function registerDeposit(uint256 _amount, address _shareRecipient)
        external
        onlyLocked
        notEmergency
    {
        IERC20(asset).safeTransferFrom(msg.sender, address(this), _amount);
        _register(_amount, _shareRecipient);
    }

    function _register(uint256 _amount, address _shareRecipient) internal {
        uint256 totalWithDepositedAmount = _totalAssets();
        require(totalWithDepositedAmount < cap, "Cap exceeded");
        userRoundQueuedDepositAmount[_shareRecipient][
            round
        ] = userRoundQueuedDepositAmount[_shareRecipient][round].add(_amount);
        pendingDeposit = pendingDeposit.add(_amount);
    }

    /**
     * @notice anyone can call this function to actually transfer the minted shares to the depositors
     * @dev this can only be called once closePosition is called to end the current round. The depositor needs a share
     * to be able to withdraw their assets in the future.
     * @param _depositor the address of the depositor
     * @param _round the round in which the depositor called `registerDeposit`
     */
    function claimShares(address _depositor, uint256 _round) external {
        require(_round < round, "Invalid round");
        uint256 amountDeposited = userRoundQueuedDepositAmount[_depositor][
            _round
        ];

        userRoundQueuedDepositAmount[_depositor][_round] = 0;

        uint256 equivalentShares = amountDeposited
            .mul(roundTotalShare[_round])
            .div(roundTotalAsset[_round]);

        // transfer shares from vault to user
        _transfer(address(this), _depositor, equivalentShares);
    }

    /**
     * @notice withdraws asset from vault using vault shares.
     * @dev The msg.sender needs to burn the vault shares to be able to withdraw. If the user called `registerDeposit`
     * without someone calling `claimShares` for them, they wont be able to withdraw. They need to have the shares in their wallet.
     * This can only be called when the vault is unlocked.
     * @param _shares is the number of vault shares to be burned
     */
    function withdraw(uint256 _shares)
        external
        nonReentrant
        onlyUnlocked
        notEmergency
    {
        uint256 withdrawAmount = _regularWithdraw(_shares);
        IERC20(asset).safeTransfer(msg.sender, withdrawAmount);
    }

    receive() external payable {}

    fallback() external payable {}

    /**
     * @notice migrate assets from old vault to this vault
     * @dev The msg.sender needs to have old vault tokens to be able to migrate to this vault.
     * @param _amount is the amount of the old vault tokens
     * @param minEth is the minimum amount expected to get while withdrawing from curve pool for the old vault withdraw function
     */
    function migrate(uint256 _amount, uint256 minEth)
        external
        payable
        onlyUnlocked
        notEmergency
        nonReentrant
    {
        IERC20(address(oldVault)).safeTransferFrom(
            msg.sender,
            address(this),
            _amount
        );
        oldVault.withdrawETH(_amount, minEth);
        _amount = address(this).balance;
        //deposit into weth
        IWETH(asset).deposit{value: _amount}();
        // mint shares and emit event
        _deposit(_amount);
    }

    /**
     * @notice allows someone to request to withdraw their assets once this round ends.
     * @dev assets can only be withdrawn after this round ends and closePosition is called. Calling this will burn the
     * shares right now but the assets will be transferred back to the user only when `withdrawFromQueue` is called.
     * This can only be called when the vault is locked.
     * @param _shares the amount of shares the user wants to cash out
     */
    function registerWithdraw(uint256 _shares) external onlyLocked {
        _burn(msg.sender, _shares);
        userRoundQueuedWithdrawShares[msg.sender][
            round
        ] = userRoundQueuedWithdrawShares[msg.sender][round].add(_shares);
        roundTotalQueuedWithdrawShares[round] = roundTotalQueuedWithdrawShares[
            round
        ].add(_shares);
    }

    /**
     * @notice allows the user to withdraw their promised assets from the withdraw queue at any time.
     * @dev the assets first need to be transferred to the withdraw queue which happens when the current round ends when
     * closePositions is called.
     * @param _round the round the user registered a queue withdraw
     */
    function withdrawFromQueue(uint256 _round)
        external
        nonReentrant
        notEmergency
    {
        uint256 withdrawAmount = _withdrawFromQueue(_round);
        IERC20(asset).safeTransfer(msg.sender, withdrawAmount);
    }

    /**
     * @notice allows anyone to close out the previous round by calling "closePositions" on all actions.
     * @dev this does the following:
     * 1. calls closePositions on all the actions withdraw the money from all the actions
     * 2. pay all the fees
     * 3. snapshots last round's shares and asset balances
     * 4. empties the pendingDeposits and pulls in those assets to be used in the next round
     * 5. sets aside assets from the main vault into the withdrawQueue
     * 6. ends the old round and unlocks the vault
     */
    function closePositions() public onlyLocked unlockState {
        // calls closePositions on all the actions and transfers the assets back into the vault
        _closeAndWithdraw();

        _payRoundFee();

        // records the net shares and assets in the current round and updates the pendingDeposits and withdrawQueue
        _snapshotShareAndAsset();

        round = round.add(1);
        currentRoundStartTimestamp = block.timestamp;
    }

    /**
     * @notice distributes funds to each action and locks the vault
     */
    function rollOver(uint256[] calldata _allocationPercentages)
        external
        virtual
        onlyOwner
        onlyUnlocked
        lockState
    {
        require(
            _allocationPercentages.length == actions.length,
            "INVALID_INPUT"
        );

        emit Rollover(_allocationPercentages);

        _distribute(_allocationPercentages);
    }

    /**
     * @notice sets the vault's state to "Emergency", which disables all withdrawals and deposits
     */
    function emergencyPause() external onlyOwner {
        stateBeforePause = state;
        state = VaultState.Emergency;
        emit StateUpdated(VaultState.Emergency);
    }

    /**
     * @notice sets the vault's state to whatever state it was before "Emergency"
     */
    function resumeFromPause() external onlyOwner {
        require(state == VaultState.Emergency, "!Emergency");
        state = stateBeforePause;
        emit StateUpdated(stateBeforePause);
    }

    /**
     * @notice sets the vault's perf fee
     */
    function setPerformanceFee(uint256 _percent) external onlyOwner {
        require(
            _percent >= 0 && _percent <= 10000,
            "% must be between 0 and 10000"
        );
        performanceFeeInPercent = _percent;
    }

    /**
     * @notice sets the vault's perf fee
     */
    function setFeeRecipient(address _recipient) external onlyOwner {
        feeRecipient = _recipient;
    }

    /**
     * @notice sets the vault's management fee
     */
    function setManagementFee(uint256 _percent) external onlyOwner {
        require(
            _percent >= 0 && _percent <= 10000,
            "% must be between 0 and 10000"
        );
        managementFeeInPercent = _percent;
    }

    /*=====================
     * Internal functions *
     *====================*/

    /**
     * @notice net assets controlled by this vault, which is effective balance + debts of actions
     */
    function _netAssetsControlled() internal view returns (uint256) {
        return _effectiveBalance().add(_totalDebt());
    }

    /**
     * @notice total assets controlled by the vault, including the pendingDeposits, withdrawQueue and debts of actions
     */
    function _totalAssets() internal view returns (uint256) {
        return IERC20(asset).balanceOf(address(this)).add(_totalDebt());
    }

    /**
     * @notice returns asset balance of the vault excluding assets registered to be withdrawn and the assets still in pendingDeposit.
     */
    function _effectiveBalance() internal view returns (uint256) {
        return
            IERC20(asset).balanceOf(address(this)).sub(pendingDeposit).sub(
                withdrawQueueAmount
            );
    }

    /**
     * @notice estimate amount of assets in all the actions
     * this function iterates through all actions and sum up the currentValue reported by each action.
     */
    function _totalDebt() internal view returns (uint256) {
        uint256 debt = 0;
        for (uint256 i = 0; i < actions.length; i++) {
            debt = debt.add(IAction(actions[i]).currentValue());
        }
        return debt;
    }

    /**
     * @notice mints the shares to depositor, and emits the deposit event
     */
    function _deposit(uint256 _amount) internal {
        // the asset is already deposited into the contract at this point, need to substract it from total
        uint256 netWithDepositedAmount = _netAssetsControlled();
        uint256 totalWithDepositedAmount = _totalAssets();
        require(totalWithDepositedAmount < cap, "Cap exceeded");
        uint256 netBeforeDeposit = netWithDepositedAmount.sub(_amount);

        uint256 share = _getSharesByDepositAmount(_amount, netBeforeDeposit);

        emit Deposit(msg.sender, _amount, share);

        _mint(msg.sender, share);
    }

    /**
     * @notice iterrate through each action, close position and withdraw funds
     */
    function _closeAndWithdraw() internal {
        for (uint8 i = 0; i < actions.length; i = i + 1) {
            // 1. close position. this should revert if any position is not ready to be closed.
            IAction(actions[i]).closePosition();

            // 2. withdraw assets
            uint256 actionBalance = IERC20(asset).balanceOf(actions[i]);
            if (actionBalance > 0)
                IERC20(asset).safeTransferFrom(
                    actions[i],
                    address(this),
                    actionBalance
                );
        }
    }

    /**
     * @notice distributes the effective balance to different actions
     * @dev the manager can keep a reserve in the vault by not distributing all the funds.
     */
    function _distribute(uint256[] memory _percentages) internal nonReentrant {
        uint256 totalBalance = _effectiveBalance();

        currentRoundStartingAmount = totalBalance;

        // keep track of total percentage to make sure we're summing up to 100%
        uint256 sumPercentage;
        for (uint8 i = 0; i < actions.length; i = i + 1) {
            sumPercentage = sumPercentage.add(_percentages[i]);
            require(sumPercentage <= BASE, "PERCENTAGE_SUM_EXCEED_MAX");

            uint256 newAmount = totalBalance.mul(_percentages[i]).div(BASE);

            if (newAmount > 0) {
                IERC20(asset).safeTransfer(actions[i], newAmount);
                IAction(actions[i]).rolloverPosition();
            }
        }

        require(sumPercentage == BASE, "PERCENTAGE_DOESNT_ADD_UP");
    }

    /**
     * @notice calculates withdraw amount from queued shares, returns withdraw amount to be handled by queueWithdraw or queueWithdrawETH
     * @param _round the round you registered a queue withdraw
     */
    function _withdrawFromQueue(uint256 _round) internal returns (uint256) {
        require(_round < round, "Invalid round");

        uint256 queuedShares = userRoundQueuedWithdrawShares[msg.sender][
            _round
        ];
        uint256 withdrawAmount = queuedShares.mul(roundTotalAsset[_round]).div(
            roundTotalShare[_round]
        );

        // remove user's queued shares
        userRoundQueuedWithdrawShares[msg.sender][_round] = 0;
        // decrease total asset we reserved for withdraw
        withdrawQueueAmount = withdrawQueueAmount.sub(withdrawAmount);

        emit WithdrawFromQueue(msg.sender, withdrawQueueAmount, _round);

        return withdrawAmount;
    }

    /**
     * @notice burn shares, return withdraw amount handle by withdraw or withdrawETH
     * @param _share amount of shares burn to withdraw asset.
     */
    function _regularWithdraw(uint256 _share) internal returns (uint256) {
        uint256 withdrawAmount = _getWithdrawAmountByShares(_share);

        _burn(msg.sender, _share);

        emit Withdraw(msg.sender, withdrawAmount, _share);

        return withdrawAmount;
    }

    /**
     * @notice return how many shares you can get if you deposit {_amount} asset
     * @param _amount amount of token depositing
     * @param _totalAssetAmount amount of asset already in the pool before deposit
     */
    function _getSharesByDepositAmount(
        uint256 _amount,
        uint256 _totalAssetAmount
    ) internal view returns (uint256) {
        uint256 shareSupply = totalSupply().add(
            roundTotalQueuedWithdrawShares[round]
        );

        uint256 shares = shareSupply == 0
            ? _amount
            : _amount.mul(shareSupply).div(_totalAssetAmount);
        return shares;
    }

    /**
     * @notice return how many asset you can get if you burn the number of shares
     */
    function _getWithdrawAmountByShares(uint256 _share)
        internal
        view
        returns (uint256)
    {
        uint256 effectiveShares = totalSupply();
        return _share.mul(_netAssetsControlled()).div(effectiveShares);
    }

    /**
     * @notice pay fee to fee recipient after we pull all assets back to the vault
     */
    function _payRoundFee() internal {
        // don't need to call totalAsset() because actions are empty now.
        uint256 newTotal = _effectiveBalance();
        uint256 profit;

        if (newTotal > currentRoundStartingAmount)
            profit = newTotal.sub(currentRoundStartingAmount);

        uint256 performanceFee = profit.mul(performanceFeeInPercent).div(BASE);

        uint256 managementFee = currentRoundStartingAmount
            .mul(managementFeeInPercent)
            .mul((block.timestamp.sub(currentRoundStartTimestamp)))
            .div(365 days)
            .div(BASE);
        uint256 totalFee = performanceFee.add(managementFee);
        if (totalFee > profit) totalFee = profit;

        currentRoundStartingAmount = 0;

        IERC20(asset).transfer(feeRecipient, totalFee);
    }

    /**
     * @notice snapshot last round's total shares and balance, excluding pending deposits.
     * @dev this function is called after withdrawing from action contracts and does the following:
     * 1. snapshots last round's shares and asset balances
     * 2. empties the pendingDeposits and pulls in those assets into the next round
     * 3. sets aside assets from the main vault into the withdrawQueue
     */
    function _snapshotShareAndAsset() internal {
        uint256 vaultBalance = _effectiveBalance();
        uint256 outStandingShares = totalSupply();
        uint256 sharesBurned = roundTotalQueuedWithdrawShares[round];

        uint256 totalShares = outStandingShares.add(sharesBurned);

        // store this round's balance and shares
        roundTotalShare[round] = totalShares;
        roundTotalAsset[round] = vaultBalance;

        // === Handle withdraw queue === //
        // withdrawQueueAmount was keeping track of total amount that should be reserved for withdraws, not including this round
        // add this round's reserved asset into withdrawQueueAmount, which will stay in the vault for withdraw

        uint256 roundReservedAsset = sharesBurned.mul(vaultBalance).div(
            totalShares
        );
        withdrawQueueAmount = withdrawQueueAmount.add(roundReservedAsset);

        // === Handle deposit queue === //
        // pendingDeposit is amount of deposit accepted in this round, which was in the vault all the time.
        // we will calculate how much shares this amount can mint, mint it at once to the vault,
        // and reset the pendingDeposit, so that this amount can be used in the next round.
        uint256 sharesToMint = pendingDeposit.mul(totalShares).div(
            vaultBalance
        );
        _mint(address(this), sharesToMint);
        pendingDeposit = 0;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal initializer {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal initializer {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/ContextUpgradeable.sol";
import "./IERC20Upgradeable.sol";
import "../../math/SafeMathUpgradeable.sol";
import "../../proxy/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable {
    using SafeMathUpgradeable for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
    uint256[44] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/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 initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.2;

interface IAction {
  /**
   * The function used to determin how much asset the current action is controlling.
   * this will impact the withdraw and deposit amount calculated from the vault.
   */
  function currentValue() external view returns (uint256);

  /**
   * The function for the vault to call at the end of each vault's round.
   * after calling this function, the vault will try to pull assets back from the action and enable withdraw.
   */
  function closePosition() external;

  /**
   * The function for the vault to call when the vault is ready to start the next round.
   * the vault will push assets to action before calling this function, but the amount can change compare to
   * the last round. So each action should check their asset balance instead of using any cached balance.
   *
   * Each action can also add additional checks and revert the `rolloverPosition` call if the action
   * is not ready to go into the next round.
   */
  function rolloverPosition() external;
}

// 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);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.2;

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

interface IOldVault is IERC20 {
    function withdrawETH(uint256 _share, uint256 minEth) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.2;

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

interface IWETH is IERC20 {
  function deposit() external payable;

  function withdraw(uint256) external;
}

// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;

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 a proxied contract can't have 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.
 *
 * 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 {UpgradeableProxy-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.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @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
     * ====
     */
    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);
    }

    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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/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 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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    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;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <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);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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OpynPerpVaultEth.VaultState","name":"state","type":"uint8"}],"name":"StateUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountWithdrawn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"shareBurned","type":"uint256"}],"name":"Withdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountWithdrawn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"round","type":"uint256"}],"name":"WithdrawFromQueue","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"BASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"actions","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"asset","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"cap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_depositor","type":"address"},{"internalType":"uint256","name":"_round","type":"uint256"}],"name":"claimShares","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"closePositions","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentRoundStartTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentRoundStartingAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"depositETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"emergencyPause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"getSharesByDepositAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"name":"getWithdrawAmountByShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"},{"internalType":"address","name":"_owner","type":"address"},{"internalType":"address","name":"_feeRecipient","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"string","name":"_tokenName","type":"string"},{"internalType":"string","name":"_tokenSymbol","type":"string"},{"internalType":"address[]","name":"_actions","type":"address[]"},{"internalType":"address","name":"_oldVault","type":"address"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"managementFeeInPercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"minEth","type":"uint256"}],"name":"migrate","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oldVault","outputs":[{"internalType":"contract IOldVault","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingDeposit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"performanceFeeInPercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_shareRecipient","type":"address"}],"name":"registerDeposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_shareRecipient","type":"address"}],"name":"registerDepositETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"name":"registerWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"resumeFromPause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_allocationPercentages","type":"uint256[]"}],"name":"rollOver","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"round","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"roundTotalAsset","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"roundTotalQueuedWithdrawShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"roundTotalShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_cap","type":"uint256"}],"name":"setCap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_recipient","type":"address"}],"name":"setFeeRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_percent","type":"uint256"}],"name":"setManagementFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_percent","type":"uint256"}],"name":"setPerformanceFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"state","outputs":[{"internalType":"enum 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OpynPerpVaultEth.VaultState","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalUnderlyingControlled","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userRoundQueuedDepositAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userRoundQueuedWithdrawShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_round","type":"uint256"}],"name":"withdrawFromQueue","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawQueueAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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