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// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import {GnosisAuction} from "../../libraries/GnosisAuction.sol";
import {
    RibbonThetaVaultStorage
} from "../../storage/RibbonThetaVaultStorage.sol";
import {Vault} from "../../libraries/Vault.sol";
import {VaultLifecycle} from "../../libraries/VaultLifecycle.sol";
import {ShareMath} from "../../libraries/ShareMath.sol";
import {ILiquidityGauge} from "../../interfaces/ILiquidityGauge.sol";
import {IVaultPauser} from "../../interfaces/IVaultPauser.sol";
import {RibbonVault} from "./base/RibbonVault.sol";

/**
 * UPGRADEABILITY: Since we use the upgradeable proxy pattern, we must observe
 * the inheritance chain closely.
 * Any changes/appends in storage variable needs to happen in RibbonThetaVaultStorage.
 * RibbonThetaVault should not inherit from any other contract aside from RibbonVault, RibbonThetaVaultStorage
 */
contract RibbonThetaVault is RibbonVault, RibbonThetaVaultStorage {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    using ShareMath for Vault.DepositReceipt;

    /************************************************
     *  IMMUTABLES & CONSTANTS
     ***********************************************/

    /// @notice oTokenFactory is the factory contract used to spawn otokens. Used to lookup otokens.
    address public immutable OTOKEN_FACTORY;

    // The minimum duration for an option auction.
    uint256 private constant MIN_AUCTION_DURATION = 5 minutes;

    /************************************************
     *  EVENTS
     ***********************************************/

    event OpenShort(
        address indexed options,
        uint256 depositAmount,
        address indexed manager
    );

    event CloseShort(
        address indexed options,
        uint256 withdrawAmount,
        address indexed manager
    );

    event NewOptionStrikeSelected(uint256 strikePrice, uint256 delta);

    event PremiumDiscountSet(
        uint256 premiumDiscount,
        uint256 newPremiumDiscount
    );

    event AuctionDurationSet(
        uint256 auctionDuration,
        uint256 newAuctionDuration
    );

    event InstantWithdraw(
        address indexed account,
        uint256 amount,
        uint256 round
    );

    event InitiateGnosisAuction(
        address indexed auctioningToken,
        address indexed biddingToken,
        uint256 auctionCounter,
        address indexed manager
    );

    /************************************************
     *  STRUCTS
     ***********************************************/

    /**
     * @notice Initialization parameters for the vault.
     * @param _owner is the owner of the vault with critical permissions
     * @param _feeRecipient is the address to recieve vault performance and management fees
     * @param _managementFee is the management fee pct.
     * @param _performanceFee is the perfomance fee pct.
     * @param _tokenName is the name of the token
     * @param _tokenSymbol is the symbol of the token
     * @param _optionsPremiumPricer is the address of the contract with the
       black-scholes premium calculation logic
     * @param _strikeSelection is the address of the contract with strike selection logic
     * @param _premiumDiscount is the vault's discount applied to the premium
     * @param _auctionDuration is the duration of the gnosis auction
     */
    struct InitParams {
        address _owner;
        address _keeper;
        address _feeRecipient;
        uint256 _managementFee;
        uint256 _performanceFee;
        string _tokenName;
        string _tokenSymbol;
        address _optionsPremiumPricer;
        address _strikeSelection;
        uint32 _premiumDiscount;
        uint256 _auctionDuration;
    }

    /************************************************
     *  CONSTRUCTOR & INITIALIZATION
     ***********************************************/

    /**
     * @notice Initializes the contract with immutable variables
     * @param _weth is the Wrapped Ether contract
     * @param _usdc is the USDC contract
     * @param _oTokenFactory is the contract address for minting new opyn option types (strikes, asset, expiry)
     * @param _gammaController is the contract address for opyn actions
     * @param _marginPool is the contract address for providing collateral to opyn
     * @param _gnosisEasyAuction is the contract address that facilitates gnosis auctions
     */
    constructor(
        address _weth,
        address _usdc,
        address _oTokenFactory,
        address _gammaController,
        address _marginPool,
        address _gnosisEasyAuction
    )
        RibbonVault(
            _weth,
            _usdc,
            _gammaController,
            _marginPool,
            _gnosisEasyAuction
        )
    {
        require(_oTokenFactory != address(0), "!_oTokenFactory");
        OTOKEN_FACTORY = _oTokenFactory;
    }

    /**
     * @notice Initializes the OptionVault contract with storage variables.
     * @param _initParams is the struct with vault initialization parameters
     * @param _vaultParams is the struct with vault general data
     */
    function initialize(
        InitParams calldata _initParams,
        Vault.VaultParams calldata _vaultParams
    ) external initializer {
        baseInitialize(
            _initParams._owner,
            _initParams._keeper,
            _initParams._feeRecipient,
            _initParams._managementFee,
            _initParams._performanceFee,
            _initParams._tokenName,
            _initParams._tokenSymbol,
            _vaultParams
        );
        require(
            _initParams._optionsPremiumPricer != address(0),
            "!_optionsPremiumPricer"
        );
        require(
            _initParams._strikeSelection != address(0),
            "!_strikeSelection"
        );
        require(
            _initParams._premiumDiscount > 0 &&
                _initParams._premiumDiscount <
                100 * Vault.PREMIUM_DISCOUNT_MULTIPLIER,
            "!_premiumDiscount"
        );
        require(
            _initParams._auctionDuration >= MIN_AUCTION_DURATION,
            "!_auctionDuration"
        );
        optionsPremiumPricer = _initParams._optionsPremiumPricer;
        strikeSelection = _initParams._strikeSelection;
        premiumDiscount = _initParams._premiumDiscount;
        auctionDuration = _initParams._auctionDuration;
    }

    /************************************************
     *  SETTERS
     ***********************************************/

    /**
     * @notice Sets the new discount on premiums for options we are selling
     * @param newPremiumDiscount is the premium discount
     */
    function setPremiumDiscount(uint256 newPremiumDiscount)
        external
        onlyKeeper
    {
        require(
            newPremiumDiscount > 0 &&
                newPremiumDiscount <= 100 * Vault.PREMIUM_DISCOUNT_MULTIPLIER,
            "Invalid discount"
        );

        emit PremiumDiscountSet(premiumDiscount, newPremiumDiscount);

        premiumDiscount = newPremiumDiscount;
    }

    /**
     * @notice Sets the new auction duration
     * @param newAuctionDuration is the auction duration
     */
    function setAuctionDuration(uint256 newAuctionDuration) external onlyOwner {
        require(
            newAuctionDuration >= MIN_AUCTION_DURATION,
            "Invalid auction duration"
        );

        emit AuctionDurationSet(auctionDuration, newAuctionDuration);

        auctionDuration = newAuctionDuration;
    }

    /**
     * @notice Sets the new strike selection contract
     * @param newStrikeSelection is the address of the new strike selection contract
     */
    function setStrikeSelection(address newStrikeSelection) external onlyOwner {
        require(newStrikeSelection != address(0), "!newStrikeSelection");
        strikeSelection = newStrikeSelection;
    }

    /**
     * @notice Sets the new options premium pricer contract
     * @param newOptionsPremiumPricer is the address of the new strike selection contract
     */
    function setOptionsPremiumPricer(address newOptionsPremiumPricer)
        external
        onlyOwner
    {
        require(
            newOptionsPremiumPricer != address(0),
            "!newOptionsPremiumPricer"
        );
        optionsPremiumPricer = newOptionsPremiumPricer;
    }

    /**
     * @notice Optionality to set strike price manually
     * @param strikePrice is the strike price of the new oTokens (decimals = 8)
     */
    function setStrikePrice(uint128 strikePrice) external onlyOwner {
        require(strikePrice > 0, "!strikePrice");
        overriddenStrikePrice = strikePrice;
        lastStrikeOverrideRound = vaultState.round;
    }

    /**
     * @notice Sets the new liquidityGauge contract for this vault
     * @param newLiquidityGauge is the address of the new liquidityGauge contract
     */
    function setLiquidityGauge(address newLiquidityGauge) external onlyOwner {
        liquidityGauge = newLiquidityGauge;
    }

    /**
     * @notice Sets the new optionsPurchaseQueue contract for this vault
     * @param newOptionsPurchaseQueue is the address of the new optionsPurchaseQueue contract
     */
    function setOptionsPurchaseQueue(address newOptionsPurchaseQueue)
        external
        onlyOwner
    {
        optionsPurchaseQueue = newOptionsPurchaseQueue;
    }

    /**
     * @notice Sets oToken Premium
     * @param minPrice is the new oToken Premium in the units of 10**18
     */
    function setMinPrice(uint256 minPrice) external onlyKeeper {
        require(minPrice > 0, "!minPrice");
        currentOtokenPremium = minPrice;
    }

    /**
     * @notice Sets the new Vault Pauser contract for this vault
     * @param newVaultPauser is the address of the new vaultPauser contract
     */
    function setVaultPauser(address newVaultPauser) external onlyOwner {
        vaultPauser = newVaultPauser;
    }

    /************************************************
     *  VAULT OPERATIONS
     ***********************************************/

    /**
     * @notice Withdraws the assets on the vault using the outstanding `DepositReceipt.amount`
     * @param amount is the amount to withdraw
     */
    function withdrawInstantly(uint256 amount) external nonReentrant {
        Vault.DepositReceipt storage depositReceipt =
            depositReceipts[msg.sender];

        uint256 currentRound = vaultState.round;
        require(amount > 0, "!amount");
        require(depositReceipt.round == currentRound, "Invalid round");

        uint256 receiptAmount = depositReceipt.amount;
        require(receiptAmount >= amount, "Exceed amount");

        // Subtraction underflow checks already ensure it is smaller than uint104
        depositReceipt.amount = uint104(receiptAmount.sub(amount));
        vaultState.totalPending = uint128(
            uint256(vaultState.totalPending).sub(amount)
        );

        emit InstantWithdraw(msg.sender, amount, currentRound);

        transferAsset(msg.sender, amount);
    }

    /**
     * @notice Initiates a withdrawal that can be processed once the round completes
     * @param numShares is the number of shares to withdraw
     */
    function initiateWithdraw(uint256 numShares) external nonReentrant {
        _initiateWithdraw(numShares);
        currentQueuedWithdrawShares = currentQueuedWithdrawShares.add(
            numShares
        );
    }

    /**
     * @notice Completes a scheduled withdrawal from a past round. Uses finalized pps for the round
     */
    function completeWithdraw() external nonReentrant {
        uint256 withdrawAmount = _completeWithdraw();
        lastQueuedWithdrawAmount = uint128(
            uint256(lastQueuedWithdrawAmount).sub(withdrawAmount)
        );
    }

    /**
     * @notice Stakes a users vault shares
     * @param numShares is the number of shares to stake
     */
    function stake(uint256 numShares) external nonReentrant {
        address _liquidityGauge = liquidityGauge;
        require(_liquidityGauge != address(0)); // Removed revert msgs due to contract size limit
        require(numShares > 0);
        uint256 heldByAccount = balanceOf(msg.sender);
        if (heldByAccount < numShares) {
            _redeem(numShares.sub(heldByAccount), false);
        }
        _transfer(msg.sender, address(this), numShares);
        _approve(address(this), _liquidityGauge, numShares);
        ILiquidityGauge(_liquidityGauge).deposit(numShares, msg.sender, false);
    }

    /**
     * @notice Sets the next option the vault will be shorting, and closes the existing short.
     *         This allows all the users to withdraw if the next option is malicious.
     */
    function commitAndClose() external nonReentrant {
        address oldOption = optionState.currentOption;

        VaultLifecycle.CloseParams memory closeParams =
            VaultLifecycle.CloseParams({
                OTOKEN_FACTORY: OTOKEN_FACTORY,
                USDC: USDC,
                currentOption: oldOption,
                delay: DELAY,
                lastStrikeOverrideRound: lastStrikeOverrideRound,
                overriddenStrikePrice: overriddenStrikePrice,
                strikeSelection: strikeSelection,
                optionsPremiumPricer: optionsPremiumPricer,
                premiumDiscount: premiumDiscount
            });

        (address otokenAddress, uint256 strikePrice, uint256 delta) =
            VaultLifecycle.commitAndClose(closeParams, vaultParams, vaultState);

        emit NewOptionStrikeSelected(strikePrice, delta);

        optionState.nextOption = otokenAddress;

        uint256 nextOptionReady = block.timestamp.add(DELAY);
        require(
            nextOptionReady <= type(uint32).max,
            "Overflow nextOptionReady"
        );
        optionState.nextOptionReadyAt = uint32(nextOptionReady);

        _closeShort(oldOption);
    }

    /**
     * @notice Closes the existing short position for the vault.
     */
    function _closeShort(address oldOption) private {
        uint256 lockedAmount = vaultState.lockedAmount;
        if (oldOption != address(0)) {
            vaultState.lastLockedAmount = uint104(lockedAmount);
        }
        vaultState.lockedAmount = 0;

        optionState.currentOption = address(0);

        if (oldOption != address(0)) {
            uint256 withdrawAmount =
                VaultLifecycle.settleShort(GAMMA_CONTROLLER);
            emit CloseShort(oldOption, withdrawAmount, msg.sender);
        }
    }

    /**
     * @notice Rolls the vault's funds into a new short position.
     */
    function rollToNextOption() external onlyKeeper nonReentrant {
        uint256 currQueuedWithdrawShares = currentQueuedWithdrawShares;

        (
            address newOption,
            uint256 lockedBalance,
            uint256 queuedWithdrawAmount
        ) =
            _rollToNextOption(
                lastQueuedWithdrawAmount,
                currQueuedWithdrawShares
            );

        lastQueuedWithdrawAmount = queuedWithdrawAmount;

        uint256 newQueuedWithdrawShares =
            uint256(vaultState.queuedWithdrawShares).add(
                currQueuedWithdrawShares
            );
        ShareMath.assertUint128(newQueuedWithdrawShares);
        vaultState.queuedWithdrawShares = uint128(newQueuedWithdrawShares);

        currentQueuedWithdrawShares = 0;

        ShareMath.assertUint104(lockedBalance);
        vaultState.lockedAmount = uint104(lockedBalance);

        emit OpenShort(newOption, lockedBalance, msg.sender);

        uint256 optionsMintAmount =
            VaultLifecycle.createShort(
                GAMMA_CONTROLLER,
                MARGIN_POOL,
                newOption,
                lockedBalance
            );

        VaultLifecycle.allocateOptions(
            optionsPurchaseQueue,
            newOption,
            optionsMintAmount,
            VaultLifecycle.QUEUE_OPTION_ALLOCATION
        );

        _startAuction();
    }

    /**
     * @notice Initiate the gnosis auction.
     */
    function startAuction() external onlyKeeper nonReentrant {
        _startAuction();
    }

    function _startAuction() private {
        GnosisAuction.AuctionDetails memory auctionDetails;

        address currentOtoken = optionState.currentOption;

        auctionDetails.oTokenAddress = currentOtoken;
        auctionDetails.gnosisEasyAuction = GNOSIS_EASY_AUCTION;
        auctionDetails.asset = vaultParams.asset;
        auctionDetails.assetDecimals = vaultParams.decimals;
        auctionDetails.oTokenPremium = currentOtokenPremium;
        auctionDetails.duration = auctionDuration;

        optionAuctionID = VaultLifecycle.startAuction(auctionDetails);
    }

    /**
     * @notice Sell the allocated options to the purchase queue post auction settlement
     */
    function sellOptionsToQueue() external onlyKeeper nonReentrant {
        VaultLifecycle.sellOptionsToQueue(
            optionsPurchaseQueue,
            GNOSIS_EASY_AUCTION,
            optionAuctionID
        );
    }

    /**
     * @notice Burn the remaining oTokens left over from gnosis auction.
     */
    function burnRemainingOTokens() external onlyKeeper nonReentrant {
        uint256 unlockedAssetAmount =
            VaultLifecycle.burnOtokens(
                GAMMA_CONTROLLER,
                optionState.currentOption
            );

        vaultState.lockedAmount = uint104(
            uint256(vaultState.lockedAmount).sub(unlockedAssetAmount)
        );
    }

    /**
     * @notice Recovery function that returns an ERC20 token to the recipient
     * @param token is the ERC20 token to recover from the vault
     * @param recipient is the recipient of the recovered tokens
     */
    function recoverTokens(address token, address recipient)
        external
        onlyOwner
    {
        require(token != vaultParams.asset, "Vault asset not recoverable");
        require(token != address(this), "Vault share not recoverable");
        require(recipient != address(this), "Recipient cannot be vault");

        IERC20(token).safeTransfer(
            recipient,
            IERC20(token).balanceOf(address(this))
        );
    }

    /**
     * @notice pause a user's vault position
     */
    function pausePosition() external {
        address _vaultPauserAddress = vaultPauser;
        require(_vaultPauserAddress != address(0)); // Removed revert msgs due to contract size limit
        _redeem(0, true);
        uint256 heldByAccount = balanceOf(msg.sender);
        _approve(msg.sender, _vaultPauserAddress, heldByAccount);
        IVaultPauser(_vaultPauserAddress).pausePosition(
            msg.sender,
            heldByAccount
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
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) {
        unchecked {
            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) {
        unchecked {
            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) {
        unchecked {
            // 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) {
        unchecked {
            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) {
        unchecked {
            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) {
        return a + b;
    }

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

    /**
     * @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.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        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) {
        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) {
        unchecked {
            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.
     *
     * 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) {
        unchecked {
            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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^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 ^0.8.0;

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

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

    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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {DSMath} from "../vendor/DSMath.sol";
import {IGnosisAuction} from "../interfaces/IGnosisAuction.sol";
import {IOtoken} from "../interfaces/GammaInterface.sol";
import {IOptionsPremiumPricer} from "../interfaces/IRibbon.sol";
import {Vault} from "./Vault.sol";
import {IRibbonThetaVault} from "../interfaces/IRibbonThetaVault.sol";

library GnosisAuction {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    event InitiateGnosisAuction(
        address indexed auctioningToken,
        address indexed biddingToken,
        uint256 auctionCounter,
        address indexed manager
    );

    event PlaceAuctionBid(
        uint256 auctionId,
        address indexed auctioningToken,
        uint256 sellAmount,
        uint256 buyAmount,
        address indexed bidder
    );

    struct AuctionDetails {
        address oTokenAddress;
        address gnosisEasyAuction;
        address asset;
        uint256 assetDecimals;
        uint256 oTokenPremium;
        uint256 duration;
    }

    struct BidDetails {
        address oTokenAddress;
        address gnosisEasyAuction;
        address asset;
        uint256 assetDecimals;
        uint256 auctionId;
        uint256 lockedBalance;
        uint256 optionAllocation;
        uint256 optionPremium;
        address bidder;
    }

    function startAuction(AuctionDetails calldata auctionDetails)
        internal
        returns (uint256 auctionID)
    {
        uint256 oTokenSellAmount =
            getOTokenSellAmount(auctionDetails.oTokenAddress);
        require(oTokenSellAmount > 0, "No otokens to sell");

        IERC20(auctionDetails.oTokenAddress).safeApprove(
            auctionDetails.gnosisEasyAuction,
            IERC20(auctionDetails.oTokenAddress).balanceOf(address(this))
        );

        // minBidAmount is total oTokens to sell * premium per oToken
        // shift decimals to correspond to decimals of USDC for puts
        // and underlying for calls
        uint256 minBidAmount =
            DSMath.wmul(
                oTokenSellAmount.mul(10**10),
                auctionDetails.oTokenPremium
            );

        minBidAmount = auctionDetails.assetDecimals > 18
            ? minBidAmount.mul(10**(auctionDetails.assetDecimals.sub(18)))
            : minBidAmount.div(
                10**(uint256(18).sub(auctionDetails.assetDecimals))
            );

        require(
            minBidAmount <= type(uint96).max,
            "optionPremium * oTokenSellAmount > type(uint96) max value!"
        );

        uint256 auctionEnd = block.timestamp.add(auctionDetails.duration);

        auctionID = IGnosisAuction(auctionDetails.gnosisEasyAuction)
            .initiateAuction(
            // address of oToken we minted and are selling
            auctionDetails.oTokenAddress,
            // address of asset we want in exchange for oTokens. Should match vault `asset`
            auctionDetails.asset,
            // orders can be cancelled at any time during the auction
            auctionEnd,
            // order will last for `duration`
            auctionEnd,
            // we are selling all of the otokens minus a fee taken by gnosis
            uint96(oTokenSellAmount),
            // the minimum we are willing to sell all the oTokens for. A discount is applied on black-scholes price
            uint96(minBidAmount),
            // the minimum bidding amount must be 1 * 10 ** -assetDecimals
            1,
            // the min funding threshold
            0,
            // no atomic closure
            false,
            // access manager contract
            address(0),
            // bytes for storing info like a whitelist for who can bid
            bytes("")
        );

        emit InitiateGnosisAuction(
            auctionDetails.oTokenAddress,
            auctionDetails.asset,
            auctionID,
            msg.sender
        );
    }

    function placeBid(BidDetails calldata bidDetails)
        internal
        returns (
            uint256 sellAmount,
            uint256 buyAmount,
            uint64 userId
        )
    {
        // calculate how much to allocate
        sellAmount = bidDetails
            .lockedBalance
            .mul(bidDetails.optionAllocation)
            .div(100 * Vault.OPTION_ALLOCATION_MULTIPLIER);

        // divide the `asset` sellAmount by the target premium per oToken to
        // get the number of oTokens to buy (8 decimals)
        buyAmount = sellAmount
            .mul(10**(bidDetails.assetDecimals.add(Vault.OTOKEN_DECIMALS)))
            .div(bidDetails.optionPremium)
            .div(10**bidDetails.assetDecimals);

        require(
            sellAmount <= type(uint96).max,
            "sellAmount > type(uint96) max value!"
        );
        require(
            buyAmount <= type(uint96).max,
            "buyAmount > type(uint96) max value!"
        );

        // approve that amount
        IERC20(bidDetails.asset).safeApprove(
            bidDetails.gnosisEasyAuction,
            sellAmount
        );

        uint96[] memory _minBuyAmounts = new uint96[](1);
        uint96[] memory _sellAmounts = new uint96[](1);
        bytes32[] memory _prevSellOrders = new bytes32[](1);
        _minBuyAmounts[0] = uint96(buyAmount);
        _sellAmounts[0] = uint96(sellAmount);
        _prevSellOrders[
            0
        ] = 0x0000000000000000000000000000000000000000000000000000000000000001;

        // place sell order with that amount
        userId = IGnosisAuction(bidDetails.gnosisEasyAuction).placeSellOrders(
            bidDetails.auctionId,
            _minBuyAmounts,
            _sellAmounts,
            _prevSellOrders,
            "0x"
        );

        emit PlaceAuctionBid(
            bidDetails.auctionId,
            bidDetails.oTokenAddress,
            sellAmount,
            buyAmount,
            bidDetails.bidder
        );

        return (sellAmount, buyAmount, userId);
    }

    function claimAuctionOtokens(
        Vault.AuctionSellOrder calldata auctionSellOrder,
        address gnosisEasyAuction,
        address counterpartyThetaVault
    ) internal {
        bytes32 order =
            encodeOrder(
                auctionSellOrder.userId,
                auctionSellOrder.buyAmount,
                auctionSellOrder.sellAmount
            );
        bytes32[] memory orders = new bytes32[](1);
        orders[0] = order;
        IGnosisAuction(gnosisEasyAuction).claimFromParticipantOrder(
            IRibbonThetaVault(counterpartyThetaVault).optionAuctionID(),
            orders
        );
    }

    function getOTokenSellAmount(address oTokenAddress)
        internal
        view
        returns (uint256)
    {
        // We take our current oToken balance. That will be our sell amount
        // but otokens will be transferred to gnosis.
        uint256 oTokenSellAmount =
            IERC20(oTokenAddress).balanceOf(address(this));

        require(
            oTokenSellAmount <= type(uint96).max,
            "oTokenSellAmount > type(uint96) max value!"
        );

        return oTokenSellAmount;
    }

    function getOTokenPremiumInStables(
        address oTokenAddress,
        address optionsPremiumPricer,
        uint256 premiumDiscount
    ) internal view returns (uint256) {
        IOtoken newOToken = IOtoken(oTokenAddress);
        IOptionsPremiumPricer premiumPricer =
            IOptionsPremiumPricer(optionsPremiumPricer);

        // Apply black-scholes formula (from rvol library) to option given its features
        // and get price for 100 contracts denominated USDC for both call and put options
        uint256 optionPremium =
            premiumPricer.getPremiumInStables(
                newOToken.strikePrice(),
                newOToken.expiryTimestamp(),
                newOToken.isPut()
            );

        // Apply a discount to incentivize arbitraguers
        optionPremium = optionPremium.mul(premiumDiscount).div(
            100 * Vault.PREMIUM_DISCOUNT_MULTIPLIER
        );

        require(
            optionPremium <= type(uint96).max,
            "optionPremium > type(uint96) max value!"
        );

        return optionPremium;
    }

    function encodeOrder(
        uint64 userId,
        uint96 buyAmount,
        uint96 sellAmount
    ) internal pure returns (bytes32) {
        return
            bytes32(
                (uint256(userId) << 192) +
                    (uint256(buyAmount) << 96) +
                    uint256(sellAmount)
            );
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

abstract contract RibbonThetaVaultStorageV1 {
    // Logic contract used to price options
    address public optionsPremiumPricer;
    // Logic contract used to select strike prices
    address public strikeSelection;
    // Premium discount on options we are selling (thousandths place: 000 - 999)
    uint256 public premiumDiscount;
    // Current oToken premium
    uint256 public currentOtokenPremium;
    // Last round id at which the strike was manually overridden
    uint16 public lastStrikeOverrideRound;
    // Price last overridden strike set to
    uint256 public overriddenStrikePrice;
    // Auction duration
    uint256 public auctionDuration;
    // Auction id of current option
    uint256 public optionAuctionID;
}

abstract contract RibbonThetaVaultStorageV2 {
    // Amount locked for scheduled withdrawals last week;
    uint256 public lastQueuedWithdrawAmount;
}

abstract contract RibbonThetaVaultStorageV3 {
    // DEPRECATED: Auction will be denominated in USDC if true
    bool private _isUsdcAuction;
    // DEPRECATED: Path for swaps
    bytes private _swapPath;
}

abstract contract RibbonThetaVaultStorageV4 {
    // LiquidityGauge contract for the vault
    address public liquidityGauge;
}

abstract contract RibbonThetaVaultStorageV5 {
    // OptionsPurchaseQueue contract for selling options
    address public optionsPurchaseQueue;
}

abstract contract RibbonThetaVaultStorageV6 {
    // Queued withdraw shares for the current round
    uint256 public currentQueuedWithdrawShares;
}

abstract contract RibbonThetaVaultStorageV7 {
    // Vault Pauser Contract for the vault
    address public vaultPauser;
}

// We are following Compound's method of upgrading new contract implementations
// When we need to add new storage variables, we create a new version of RibbonThetaVaultStorage
// e.g. RibbonThetaVaultStorage<versionNumber>, so finally it would look like
// contract RibbonThetaVaultStorage is RibbonThetaVaultStorageV1, RibbonThetaVaultStorageV2
abstract contract RibbonThetaVaultStorage is
    RibbonThetaVaultStorageV1,
    RibbonThetaVaultStorageV2,
    RibbonThetaVaultStorageV3,
    RibbonThetaVaultStorageV4,
    RibbonThetaVaultStorageV5,
    RibbonThetaVaultStorageV6,
    RibbonThetaVaultStorageV7
{

}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

library Vault {
    /************************************************
     *  IMMUTABLES & CONSTANTS
     ***********************************************/

    // Fees are 6-decimal places. For example: 20 * 10**6 = 20%
    uint256 internal constant FEE_MULTIPLIER = 10**6;

    // Premium discount has 1-decimal place. For example: 80 * 10**1 = 80%. Which represents a 20% discount.
    uint256 internal constant PREMIUM_DISCOUNT_MULTIPLIER = 10;

    // Otokens have 8 decimal places.
    uint256 internal constant OTOKEN_DECIMALS = 8;

    // Percentage of funds allocated to options is 2 decimal places. 10 * 10**2 = 10%
    uint256 internal constant OPTION_ALLOCATION_MULTIPLIER = 10**2;

    // Placeholder uint value to prevent cold writes
    uint256 internal constant PLACEHOLDER_UINT = 1;

    struct VaultParams {
        // Option type the vault is selling
        bool isPut;
        // Token decimals for vault shares
        uint8 decimals;
        // Asset used in Theta / Delta Vault
        address asset;
        // Underlying asset of the options sold by vault
        address underlying;
        // Minimum supply of the vault shares issued, for ETH it's 10**10
        uint56 minimumSupply;
        // Vault cap
        uint104 cap;
    }

    struct OptionState {
        // Option that the vault is shorting / longing in the next cycle
        address nextOption;
        // Option that the vault is currently shorting / longing
        address currentOption;
        // The timestamp when the `nextOption` can be used by the vault
        uint32 nextOptionReadyAt;
    }

    struct VaultState {
        // 32 byte slot 1
        //  Current round number. `round` represents the number of `period`s elapsed.
        uint16 round;
        // Amount that is currently locked for selling options
        uint104 lockedAmount;
        // Amount that was locked for selling options in the previous round
        // used for calculating performance fee deduction
        uint104 lastLockedAmount;
        // 32 byte slot 2
        // Stores the total tally of how much of `asset` there is
        // to be used to mint rTHETA tokens
        uint128 totalPending;
        // Total amount of queued withdrawal shares from previous rounds (doesn't include the current round)
        uint128 queuedWithdrawShares;
    }

    struct DepositReceipt {
        // Maximum of 65535 rounds. Assuming 1 round is 7 days, maximum is 1256 years.
        uint16 round;
        // Deposit amount, max 20,282,409,603,651 or 20 trillion ETH deposit
        uint104 amount;
        // Unredeemed shares balance
        uint128 unredeemedShares;
    }

    struct Withdrawal {
        // Maximum of 65535 rounds. Assuming 1 round is 7 days, maximum is 1256 years.
        uint16 round;
        // Number of shares withdrawn
        uint128 shares;
    }

    struct AuctionSellOrder {
        // Amount of `asset` token offered in auction
        uint96 sellAmount;
        // Amount of oToken requested in auction
        uint96 buyAmount;
        // User Id of delta vault in latest gnosis auction
        uint64 userId;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {Vault} from "./Vault.sol";
import {ShareMath} from "./ShareMath.sol";
import {IStrikeSelection} from "../interfaces/IRibbon.sol";
import {GnosisAuction} from "./GnosisAuction.sol";
import {
    IOtokenFactory,
    IOtoken,
    IController,
    GammaTypes
} from "../interfaces/GammaInterface.sol";
import {IERC20Detailed} from "../interfaces/IERC20Detailed.sol";
import {IGnosisAuction} from "../interfaces/IGnosisAuction.sol";
import {IOptionsPurchaseQueue} from "../interfaces/IOptionsPurchaseQueue.sol";
import {SupportsNonCompliantERC20} from "./SupportsNonCompliantERC20.sol";
import {IOptionsPremiumPricer} from "../interfaces/IRibbon.sol";

library VaultLifecycle {
    using SafeMath for uint256;
    using SupportsNonCompliantERC20 for IERC20;

    struct CloseParams {
        address OTOKEN_FACTORY;
        address USDC;
        address currentOption;
        uint256 delay;
        uint16 lastStrikeOverrideRound;
        uint256 overriddenStrikePrice;
        address strikeSelection;
        address optionsPremiumPricer;
        uint256 premiumDiscount;
    }

    /// @notice Default maximum option allocation for the queue (50%)
    uint256 internal constant QUEUE_OPTION_ALLOCATION = 5000;

    /**
     * @notice Sets the next option the vault will be shorting, and calculates its premium for the auction
     * @param closeParams is the struct with details on previous option and strike selection details
     * @param vaultParams is the struct with vault general data
     * @param vaultState is the struct with vault accounting state
     * @return otokenAddress is the address of the new option
     * @return strikePrice is the strike price of the new option
     * @return delta is the delta of the new option
     */
    function commitAndClose(
        CloseParams calldata closeParams,
        Vault.VaultParams storage vaultParams,
        Vault.VaultState storage vaultState
    )
        external
        returns (
            address otokenAddress,
            uint256 strikePrice,
            uint256 delta
        )
    {
        uint256 expiry = getNextExpiry(closeParams.currentOption);

        IStrikeSelection selection =
            IStrikeSelection(closeParams.strikeSelection);

        bool isPut = vaultParams.isPut;
        address underlying = vaultParams.underlying;
        address asset = vaultParams.asset;

        (strikePrice, delta) = closeParams.lastStrikeOverrideRound ==
            vaultState.round
            ? (closeParams.overriddenStrikePrice, selection.delta())
            : selection.getStrikePrice(expiry, isPut);

        require(strikePrice != 0, "!strikePrice");

        // retrieve address if option already exists, or deploy it
        otokenAddress = getOrDeployOtoken(
            closeParams,
            vaultParams,
            underlying,
            asset,
            strikePrice,
            expiry,
            isPut
        );

        return (otokenAddress, strikePrice, delta);
    }

    /**
     * @notice Verify the otoken has the correct parameters to prevent vulnerability to opyn contract changes
     * @param otokenAddress is the address of the otoken
     * @param vaultParams is the struct with vault general data
     * @param collateralAsset is the address of the collateral asset
     * @param USDC is the address of usdc
     * @param delay is the delay between commitAndClose and rollToNextOption
     */
    function verifyOtoken(
        address otokenAddress,
        Vault.VaultParams storage vaultParams,
        address collateralAsset,
        address USDC,
        uint256 delay
    ) private view {
        require(otokenAddress != address(0), "!otokenAddress");

        IOtoken otoken = IOtoken(otokenAddress);
        require(otoken.isPut() == vaultParams.isPut, "Type mismatch");
        require(
            otoken.underlyingAsset() == vaultParams.underlying,
            "Wrong underlyingAsset"
        );
        require(
            otoken.collateralAsset() == collateralAsset,
            "Wrong collateralAsset"
        );

        // we just assume all options use USDC as the strike
        require(otoken.strikeAsset() == USDC, "strikeAsset != USDC");

        uint256 readyAt = block.timestamp.add(delay);
        require(otoken.expiryTimestamp() >= readyAt, "Expiry before delay");
    }

    /**
     * @param decimals is the decimals of the asset
     * @param totalBalance is the vaults total balance of the asset
     * @param currentShareSupply is the supply of the shares invoked with totalSupply()
     * @param lastQueuedWithdrawAmount is the total amount queued for withdrawals
     * @param performanceFee is the perf fee percent to charge on premiums
     * @param managementFee is the management fee percent to charge on the AUM
     * @param currentQueuedWithdrawShares is amount of queued withdrawals from the current round
     */
    struct RolloverParams {
        uint256 decimals;
        uint256 totalBalance;
        uint256 currentShareSupply;
        uint256 lastQueuedWithdrawAmount;
        uint256 performanceFee;
        uint256 managementFee;
        uint256 currentQueuedWithdrawShares;
    }

    /**
     * @notice Calculate the shares to mint, new price per share, and
      amount of funds to re-allocate as collateral for the new round
     * @param vaultState is the storage variable vaultState passed from RibbonVault
     * @param params is the rollover parameters passed to compute the next state
     * @return newLockedAmount is the amount of funds to allocate for the new round
     * @return queuedWithdrawAmount is the amount of funds set aside for withdrawal
     * @return newPricePerShare is the price per share of the new round
     * @return mintShares is the amount of shares to mint from deposits
     * @return performanceFeeInAsset is the performance fee charged by vault
     * @return totalVaultFee is the total amount of fee charged by vault
     */
    function rollover(
        Vault.VaultState storage vaultState,
        RolloverParams calldata params
    )
        external
        view
        returns (
            uint256 newLockedAmount,
            uint256 queuedWithdrawAmount,
            uint256 newPricePerShare,
            uint256 mintShares,
            uint256 performanceFeeInAsset,
            uint256 totalVaultFee
        )
    {
        uint256 currentBalance = params.totalBalance;
        uint256 pendingAmount = vaultState.totalPending;
        // Total amount of queued withdrawal shares from previous rounds (doesn't include the current round)
        uint256 lastQueuedWithdrawShares = vaultState.queuedWithdrawShares;

        // Deduct older queued withdraws so we don't charge fees on them
        uint256 balanceForVaultFees =
            currentBalance.sub(params.lastQueuedWithdrawAmount);

        {
            (performanceFeeInAsset, , totalVaultFee) = VaultLifecycle
                .getVaultFees(
                balanceForVaultFees,
                vaultState.lastLockedAmount,
                vaultState.totalPending,
                params.performanceFee,
                params.managementFee
            );
        }

        // Take into account the fee
        // so we can calculate the newPricePerShare
        currentBalance = currentBalance.sub(totalVaultFee);

        {
            newPricePerShare = ShareMath.pricePerShare(
                params.currentShareSupply.sub(lastQueuedWithdrawShares),
                currentBalance.sub(params.lastQueuedWithdrawAmount),
                pendingAmount,
                params.decimals
            );

            queuedWithdrawAmount = params.lastQueuedWithdrawAmount.add(
                ShareMath.sharesToAsset(
                    params.currentQueuedWithdrawShares,
                    newPricePerShare,
                    params.decimals
                )
            );

            // After closing the short, if the options expire in-the-money
            // vault pricePerShare would go down because vault's asset balance decreased.
            // This ensures that the newly-minted shares do not take on the loss.
            mintShares = ShareMath.assetToShares(
                pendingAmount,
                newPricePerShare,
                params.decimals
            );
        }

        return (
            currentBalance.sub(queuedWithdrawAmount), // new locked balance subtracts the queued withdrawals
            queuedWithdrawAmount,
            newPricePerShare,
            mintShares,
            performanceFeeInAsset,
            totalVaultFee
        );
    }

    /**
     * @notice Creates the actual Opyn short position by depositing collateral and minting otokens
     * @param gammaController is the address of the opyn controller contract
     * @param marginPool is the address of the opyn margin contract which holds the collateral
     * @param oTokenAddress is the address of the otoken to mint
     * @param depositAmount is the amount of collateral to deposit
     * @return the otoken mint amount
     */
    function createShort(
        address gammaController,
        address marginPool,
        address oTokenAddress,
        uint256 depositAmount
    ) external returns (uint256) {
        IController controller = IController(gammaController);
        uint256 newVaultID =
            (controller.getAccountVaultCounter(address(this))).add(1);

        // An otoken's collateralAsset is the vault's `asset`
        // So in the context of performing Opyn short operations we call them collateralAsset
        IOtoken oToken = IOtoken(oTokenAddress);
        address collateralAsset = oToken.collateralAsset();

        uint256 collateralDecimals =
            uint256(IERC20Detailed(collateralAsset).decimals());
        uint256 mintAmount;

        if (oToken.isPut()) {
            // For minting puts, there will be instances where the full depositAmount will not be used for minting.
            // This is because of an issue with precision.
            //
            // For ETH put options, we are calculating the mintAmount (10**8 decimals) using
            // the depositAmount (10**18 decimals), which will result in truncation of decimals when scaling down.
            // As a result, there will be tiny amounts of dust left behind in the Opyn vault when minting put otokens.
            //
            // For simplicity's sake, we do not refund the dust back to the address(this) on minting otokens.
            // We retain the dust in the vault so the calling contract can withdraw the
            // actual locked amount + dust at settlement.
            //
            // To test this behavior, we can console.log
            // MarginCalculatorInterface(0x7A48d10f372b3D7c60f6c9770B91398e4ccfd3C7).getExcessCollateral(vault)
            // to see how much dust (or excess collateral) is left behind.
            mintAmount = depositAmount
                .mul(10**Vault.OTOKEN_DECIMALS)
                .mul(10**18) // we use 10**18 to give extra precision
                .div(oToken.strikePrice().mul(10**(10 + collateralDecimals)));
        } else {
            mintAmount = depositAmount;

            if (collateralDecimals > 8) {
                uint256 scaleBy = 10**(collateralDecimals.sub(8)); // oTokens have 8 decimals
                if (mintAmount > scaleBy) {
                    mintAmount = depositAmount.div(scaleBy); // scale down from 10**18 to 10**8
                }
            }
        }

        // double approve to fix non-compliant ERC20s
        IERC20 collateralToken = IERC20(collateralAsset);
        collateralToken.safeApproveNonCompliant(marginPool, depositAmount);

        IController.ActionArgs[] memory actions =
            new IController.ActionArgs[](3);

        actions[0] = IController.ActionArgs(
            IController.ActionType.OpenVault,
            address(this), // owner
            address(this), // receiver
            address(0), // asset, otoken
            newVaultID, // vaultId
            0, // amount
            0, //index
            "" //data
        );

        actions[1] = IController.ActionArgs(
            IController.ActionType.DepositCollateral,
            address(this), // owner
            address(this), // address to transfer from
            collateralAsset, // deposited asset
            newVaultID, // vaultId
            depositAmount, // amount
            0, //index
            "" //data
        );

        actions[2] = IController.ActionArgs(
            IController.ActionType.MintShortOption,
            address(this), // owner
            address(this), // address to transfer to
            oTokenAddress, // option address
            newVaultID, // vaultId
            mintAmount, // amount
            0, //index
            "" //data
        );

        controller.operate(actions);

        return mintAmount;
    }

    /**
     * @notice Close the existing short otoken position. Currently this implementation is simple.
     * It closes the most recent vault opened by the contract. This assumes that the contract will
     * only have a single vault open at any given time. Since calling `_closeShort` deletes vaults by
     calling SettleVault action, this assumption should hold.
     * @param gammaController is the address of the opyn controller contract
     * @return amount of collateral redeemed from the vault
     */
    function settleShort(address gammaController) external returns (uint256) {
        IController controller = IController(gammaController);

        // gets the currently active vault ID
        uint256 vaultID = controller.getAccountVaultCounter(address(this));

        GammaTypes.Vault memory vault =
            controller.getVault(address(this), vaultID);

        require(vault.shortOtokens.length > 0, "No short");

        // An otoken's collateralAsset is the vault's `asset`
        // So in the context of performing Opyn short operations we call them collateralAsset
        IERC20 collateralToken = IERC20(vault.collateralAssets[0]);

        // The short position has been previously closed, or all the otokens have been burned.
        // So we return early.
        if (address(collateralToken) == address(0)) {
            return 0;
        }

        // This is equivalent to doing IERC20(vault.asset).balanceOf(address(this))
        uint256 startCollateralBalance =
            collateralToken.balanceOf(address(this));

        // If it is after expiry, we need to settle the short position using the normal way
        // Delete the vault and withdraw all remaining collateral from the vault
        IController.ActionArgs[] memory actions =
            new IController.ActionArgs[](1);

        actions[0] = IController.ActionArgs(
            IController.ActionType.SettleVault,
            address(this), // owner
            address(this), // address to transfer to
            address(0), // not used
            vaultID, // vaultId
            0, // not used
            0, // not used
            "" // not used
        );

        controller.operate(actions);

        uint256 endCollateralBalance = collateralToken.balanceOf(address(this));

        return endCollateralBalance.sub(startCollateralBalance);
    }

    /**
     * @notice Exercises the ITM option using existing long otoken position. Currently this implementation is simple.
     * It calls the `Redeem` action to claim the payout.
     * @param gammaController is the address of the opyn controller contract
     * @param oldOption is the address of the old option
     * @param asset is the address of the vault's asset
     * @return amount of asset received by exercising the option
     */
    function settleLong(
        address gammaController,
        address oldOption,
        address asset
    ) external returns (uint256) {
        IController controller = IController(gammaController);

        uint256 oldOptionBalance = IERC20(oldOption).balanceOf(address(this));

        if (controller.getPayout(oldOption, oldOptionBalance) == 0) {
            return 0;
        }

        uint256 startAssetBalance = IERC20(asset).balanceOf(address(this));

        // If it is after expiry, we need to redeem the profits
        IController.ActionArgs[] memory actions =
            new IController.ActionArgs[](1);

        actions[0] = IController.ActionArgs(
            IController.ActionType.Redeem,
            address(0), // not used
            address(this), // address to send profits to
            oldOption, // address of otoken
            0, // not used
            oldOptionBalance, // otoken balance
            0, // not used
            "" // not used
        );

        controller.operate(actions);

        uint256 endAssetBalance = IERC20(asset).balanceOf(address(this));

        return endAssetBalance.sub(startAssetBalance);
    }

    /**
     * @notice Burn the remaining oTokens left over from auction. Currently this implementation is simple.
     * It burns oTokens from the most recent vault opened by the contract. This assumes that the contract will
     * only have a single vault open at any given time.
     * @param gammaController is the address of the opyn controller contract
     * @param currentOption is the address of the current option
     * @return amount of collateral redeemed by burning otokens
     */
    function burnOtokens(address gammaController, address currentOption)
        external
        returns (uint256)
    {
        uint256 numOTokensToBurn =
            IERC20(currentOption).balanceOf(address(this));

        require(numOTokensToBurn > 0, "No oTokens to burn");

        IController controller = IController(gammaController);

        // gets the currently active vault ID
        uint256 vaultID = controller.getAccountVaultCounter(address(this));

        GammaTypes.Vault memory vault =
            controller.getVault(address(this), vaultID);

        require(vault.shortOtokens.length > 0, "No short");

        IERC20 collateralToken = IERC20(vault.collateralAssets[0]);

        uint256 startCollateralBalance =
            collateralToken.balanceOf(address(this));

        // Burning `amount` of oTokens from the ribbon vault,
        // then withdrawing the corresponding collateral amount from the vault
        IController.ActionArgs[] memory actions =
            new IController.ActionArgs[](2);

        actions[0] = IController.ActionArgs(
            IController.ActionType.BurnShortOption,
            address(this), // owner
            address(this), // address to transfer from
            address(vault.shortOtokens[0]), // otoken address
            vaultID, // vaultId
            numOTokensToBurn, // amount
            0, //index
            "" //data
        );

        actions[1] = IController.ActionArgs(
            IController.ActionType.WithdrawCollateral,
            address(this), // owner
            address(this), // address to transfer to
            address(collateralToken), // withdrawn asset
            vaultID, // vaultId
            vault.collateralAmounts[0].mul(numOTokensToBurn).div(
                vault.shortAmounts[0]
            ), // amount
            0, //index
            "" //data
        );

        controller.operate(actions);

        uint256 endCollateralBalance = collateralToken.balanceOf(address(this));

        return endCollateralBalance.sub(startCollateralBalance);
    }

    /**
     * @notice Calculates the performance and management fee for this week's round
     * @param currentBalance is the balance of funds held on the vault after closing short
     * @param lastLockedAmount is the amount of funds locked from the previous round
     * @param pendingAmount is the pending deposit amount
     * @param performanceFeePercent is the performance fee pct.
     * @param managementFeePercent is the management fee pct.
     * @return performanceFeeInAsset is the performance fee
     * @return managementFeeInAsset is the management fee
     * @return vaultFee is the total fees
     */
    function getVaultFees(
        uint256 currentBalance,
        uint256 lastLockedAmount,
        uint256 pendingAmount,
        uint256 performanceFeePercent,
        uint256 managementFeePercent
    )
        internal
        pure
        returns (
            uint256 performanceFeeInAsset,
            uint256 managementFeeInAsset,
            uint256 vaultFee
        )
    {
        // At the first round, currentBalance=0, pendingAmount>0
        // so we just do not charge anything on the first round
        uint256 lockedBalanceSansPending =
            currentBalance > pendingAmount
                ? currentBalance.sub(pendingAmount)
                : 0;

        uint256 _performanceFeeInAsset;
        uint256 _managementFeeInAsset;
        uint256 _vaultFee;

        // Take performance fee and management fee ONLY if difference between
        // last week and this week's vault deposits, taking into account pending
        // deposits and withdrawals, is positive. If it is negative, last week's
        // option expired ITM past breakeven, and the vault took a loss so we
        // do not collect performance fee for last week
        if (lockedBalanceSansPending > lastLockedAmount) {
            _performanceFeeInAsset = performanceFeePercent > 0
                ? lockedBalanceSansPending
                    .sub(lastLockedAmount)
                    .mul(performanceFeePercent)
                    .div(100 * Vault.FEE_MULTIPLIER)
                : 0;
            _managementFeeInAsset = managementFeePercent > 0
                ? lockedBalanceSansPending.mul(managementFeePercent).div(
                    100 * Vault.FEE_MULTIPLIER
                )
                : 0;

            _vaultFee = _performanceFeeInAsset.add(_managementFeeInAsset);
        }

        return (_performanceFeeInAsset, _managementFeeInAsset, _vaultFee);
    }

    /**
     * @notice Either retrieves the option token if it already exists, or deploy it
     * @param closeParams is the struct with details on previous option and strike selection details
     * @param vaultParams is the struct with vault general data
     * @param underlying is the address of the underlying asset of the option
     * @param collateralAsset is the address of the collateral asset of the option
     * @param strikePrice is the strike price of the option
     * @param expiry is the expiry timestamp of the option
     * @param isPut is whether the option is a put
     * @return the address of the option
     */
    function getOrDeployOtoken(
        CloseParams calldata closeParams,
        Vault.VaultParams storage vaultParams,
        address underlying,
        address collateralAsset,
        uint256 strikePrice,
        uint256 expiry,
        bool isPut
    ) internal returns (address) {
        IOtokenFactory factory = IOtokenFactory(closeParams.OTOKEN_FACTORY);

        address otokenFromFactory =
            factory.getOtoken(
                underlying,
                closeParams.USDC,
                collateralAsset,
                strikePrice,
                expiry,
                isPut
            );

        if (otokenFromFactory != address(0)) {
            return otokenFromFactory;
        }

        address otoken =
            factory.createOtoken(
                underlying,
                closeParams.USDC,
                collateralAsset,
                strikePrice,
                expiry,
                isPut
            );

        verifyOtoken(
            otoken,
            vaultParams,
            collateralAsset,
            closeParams.USDC,
            closeParams.delay
        );

        return otoken;
    }

    function getOTokenPremium(
        address oTokenAddress,
        address optionsPremiumPricer,
        uint256 premiumDiscount
    ) external view returns (uint256) {
        return
            _getOTokenPremium(
                oTokenAddress,
                optionsPremiumPricer,
                premiumDiscount
            );
    }

    function _getOTokenPremium(
        address oTokenAddress,
        address optionsPremiumPricer,
        uint256 premiumDiscount
    ) internal view returns (uint256) {
        IOtoken newOToken = IOtoken(oTokenAddress);
        IOptionsPremiumPricer premiumPricer =
            IOptionsPremiumPricer(optionsPremiumPricer);

        // Apply black-scholes formula (from rvol library) to option given its features
        // and get price for 100 contracts denominated in the underlying asset for call option
        // and USDC for put option
        uint256 optionPremium =
            premiumPricer.getPremium(
                newOToken.strikePrice(),
                newOToken.expiryTimestamp(),
                newOToken.isPut()
            );

        // Apply a discount to incentivize arbitraguers
        optionPremium = optionPremium.mul(premiumDiscount).div(
            100 * Vault.PREMIUM_DISCOUNT_MULTIPLIER
        );

        require(
            optionPremium <= type(uint96).max,
            "optionPremium > type(uint96) max value!"
        );
        require(optionPremium > 0, "!optionPremium");

        return optionPremium;
    }

    /**
     * @notice Starts the gnosis auction
     * @param auctionDetails is the struct with all the custom parameters of the auction
     * @return the auction id of the newly created auction
     */
    function startAuction(GnosisAuction.AuctionDetails calldata auctionDetails)
        external
        returns (uint256)
    {
        return GnosisAuction.startAuction(auctionDetails);
    }

    /**
     * @notice Settles the gnosis auction
     * @param gnosisEasyAuction is the contract address of Gnosis easy auction protocol
     * @param auctionID is the auction ID of the gnosis easy auction
     */
    function settleAuction(address gnosisEasyAuction, uint256 auctionID)
        internal
    {
        IGnosisAuction(gnosisEasyAuction).settleAuction(auctionID);
    }

    /**
     * @notice Places a bid in an auction
     * @param bidDetails is the struct with all the details of the
      bid including the auction's id and how much to bid
     */
    function placeBid(GnosisAuction.BidDetails calldata bidDetails)
        external
        returns (
            uint256 sellAmount,
            uint256 buyAmount,
            uint64 userId
        )
    {
        return GnosisAuction.placeBid(bidDetails);
    }

    /**
     * @notice Claims the oTokens belonging to the vault
     * @param auctionSellOrder is the sell order of the bid
     * @param gnosisEasyAuction is the address of the gnosis auction contract
     holding custody to the funds
     * @param counterpartyThetaVault is the address of the counterparty theta
     vault of this delta vault
     */
    function claimAuctionOtokens(
        Vault.AuctionSellOrder calldata auctionSellOrder,
        address gnosisEasyAuction,
        address counterpartyThetaVault
    ) external {
        GnosisAuction.claimAuctionOtokens(
            auctionSellOrder,
            gnosisEasyAuction,
            counterpartyThetaVault
        );
    }

    /**
     * @notice Allocates the vault's minted options to the OptionsPurchaseQueue contract
     * @dev Skipped if the optionsPurchaseQueue doesn't exist
     * @param optionsPurchaseQueue is the OptionsPurchaseQueue contract
     * @param option is the minted option
     * @param optionsAmount is the amount of options minted
     * @param optionAllocation is the maximum % of options to allocate towards the purchase queue (will only allocate
     *  up to the amount that is on the queue)
     * @return allocatedOptions is the amount of options that ended up getting allocated to the OptionsPurchaseQueue
     */
    function allocateOptions(
        address optionsPurchaseQueue,
        address option,
        uint256 optionsAmount,
        uint256 optionAllocation
    ) external returns (uint256 allocatedOptions) {
        // Skip if optionsPurchaseQueue is address(0)
        if (optionsPurchaseQueue != address(0)) {
            allocatedOptions = optionsAmount.mul(optionAllocation).div(
                100 * Vault.OPTION_ALLOCATION_MULTIPLIER
            );
            allocatedOptions = IOptionsPurchaseQueue(optionsPurchaseQueue)
                .getOptionsAllocation(address(this), allocatedOptions);

            if (allocatedOptions != 0) {
                IERC20(option).approve(optionsPurchaseQueue, allocatedOptions);
                IOptionsPurchaseQueue(optionsPurchaseQueue).allocateOptions(
                    allocatedOptions
                );
            }
        }

        return allocatedOptions;
    }

    /**
     * @notice Sell the allocated options to the purchase queue post auction settlement
     * @dev Reverts if the auction hasn't settled yet
     * @param optionsPurchaseQueue is the OptionsPurchaseQueue contract
     * @param gnosisEasyAuction The address of the Gnosis Easy Auction contract
     * @return totalPremiums Total premiums earnt by the vault
     */
    function sellOptionsToQueue(
        address optionsPurchaseQueue,
        address gnosisEasyAuction,
        uint256 optionAuctionID
    ) external returns (uint256) {
        uint256 settlementPrice =
            getAuctionSettlementPrice(gnosisEasyAuction, optionAuctionID);
        require(settlementPrice != 0, "!settlementPrice");

        return
            IOptionsPurchaseQueue(optionsPurchaseQueue).sellToBuyers(
                settlementPrice
            );
    }

    /**
     * @notice Gets the settlement price of a settled auction
     * @param gnosisEasyAuction The address of the Gnosis Easy Auction contract
     * @return settlementPrice Auction settlement price
     */
    function getAuctionSettlementPrice(
        address gnosisEasyAuction,
        uint256 optionAuctionID
    ) public view returns (uint256) {
        bytes32 clearingPriceOrder =
            IGnosisAuction(gnosisEasyAuction)
                .auctionData(optionAuctionID)
                .clearingPriceOrder;

        if (clearingPriceOrder == bytes32(0)) {
            // Current auction hasn't settled yet
            return 0;
        } else {
            // We decode the clearingPriceOrder to find the auction settlement price
            // settlementPrice = clearingPriceOrder.sellAmount / clearingPriceOrder.buyAmount
            return
                (10**Vault.OTOKEN_DECIMALS)
                    .mul(
                    uint96(uint256(clearingPriceOrder)) // sellAmount
                )
                    .div(
                    uint96(uint256(clearingPriceOrder) >> 96) // buyAmount
                );
        }
    }

    /**
     * @notice Verify the constructor params satisfy requirements
     * @param owner is the owner of the vault with critical permissions
     * @param feeRecipient is the address to recieve vault performance and management fees
     * @param performanceFee is the perfomance fee pct.
     * @param tokenName is the name of the token
     * @param tokenSymbol is the symbol of the token
     * @param _vaultParams is the struct with vault general data
     */
    function verifyInitializerParams(
        address owner,
        address keeper,
        address feeRecipient,
        uint256 performanceFee,
        uint256 managementFee,
        string calldata tokenName,
        string calldata tokenSymbol,
        Vault.VaultParams calldata _vaultParams
    ) external pure {
        require(owner != address(0), "!owner");
        require(keeper != address(0), "!keeper");
        require(feeRecipient != address(0), "!feeRecipient");
        require(
            performanceFee < 100 * Vault.FEE_MULTIPLIER,
            "performanceFee >= 100%"
        );
        require(
            managementFee < 100 * Vault.FEE_MULTIPLIER,
            "managementFee >= 100%"
        );
        require(bytes(tokenName).length > 0, "!tokenName");
        require(bytes(tokenSymbol).length > 0, "!tokenSymbol");

        require(_vaultParams.asset != address(0), "!asset");
        require(_vaultParams.underlying != address(0), "!underlying");
        require(_vaultParams.minimumSupply > 0, "!minimumSupply");
        require(_vaultParams.cap > 0, "!cap");
        require(
            _vaultParams.cap > _vaultParams.minimumSupply,
            "cap has to be higher than minimumSupply"
        );
    }

    /**
     * @notice Gets the next option expiry timestamp
     * @param currentOption is the otoken address that the vault is currently writing
     */
    function getNextExpiry(address currentOption)
        internal
        view
        returns (uint256)
    {
        // uninitialized state
        if (currentOption == address(0)) {
            return getNextFriday(block.timestamp);
        }
        uint256 currentExpiry = IOtoken(currentOption).expiryTimestamp();

        // After options expiry if no options are written for >1 week
        // We need to give the ability continue writing options
        if (block.timestamp > currentExpiry + 7 days) {
            return getNextFriday(block.timestamp);
        }
        return getNextFriday(currentExpiry);
    }

    /**
     * @notice Gets the next options expiry timestamp
     * @param timestamp is the expiry timestamp of the current option
     * Reference: https://codereview.stackexchange.com/a/33532
     * Examples:
     * getNextFriday(week 1 thursday) -> week 1 friday
     * getNextFriday(week 1 friday) -> week 2 friday
     * getNextFriday(week 1 saturday) -> week 2 friday
     */
    function getNextFriday(uint256 timestamp) internal pure returns (uint256) {
        // dayOfWeek = 0 (sunday) - 6 (saturday)
        uint256 dayOfWeek = ((timestamp / 1 days) + 4) % 7;
        uint256 nextFriday = timestamp + ((7 + 5 - dayOfWeek) % 7) * 1 days;
        uint256 friday8am = nextFriday - (nextFriday % (24 hours)) + (8 hours);

        // If the passed timestamp is day=Friday hour>8am, we simply increment it by a week to next Friday
        if (timestamp >= friday8am) {
            friday8am += 7 days;
        }
        return friday8am;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {Vault} from "./Vault.sol";

library ShareMath {
    using SafeMath for uint256;

    uint256 internal constant PLACEHOLDER_UINT = 1;

    function assetToShares(
        uint256 assetAmount,
        uint256 assetPerShare,
        uint256 decimals
    ) internal pure returns (uint256) {
        // If this throws, it means that vault's roundPricePerShare[currentRound] has not been set yet
        // which should never happen.
        // Has to be larger than 1 because `1` is used in `initRoundPricePerShares` to prevent cold writes.
        require(assetPerShare > PLACEHOLDER_UINT, "Invalid assetPerShare");

        return assetAmount.mul(10**decimals).div(assetPerShare);
    }

    function sharesToAsset(
        uint256 shares,
        uint256 assetPerShare,
        uint256 decimals
    ) internal pure returns (uint256) {
        // If this throws, it means that vault's roundPricePerShare[currentRound] has not been set yet
        // which should never happen.
        // Has to be larger than 1 because `1` is used in `initRoundPricePerShares` to prevent cold writes.
        require(assetPerShare > PLACEHOLDER_UINT, "Invalid assetPerShare");

        return shares.mul(assetPerShare).div(10**decimals);
    }

    /**
     * @notice Returns the shares unredeemed by the user given their DepositReceipt
     * @param depositReceipt is the user's deposit receipt
     * @param currentRound is the `round` stored on the vault
     * @param assetPerShare is the price in asset per share
     * @param decimals is the number of decimals the asset/shares use
     * @return unredeemedShares is the user's virtual balance of shares that are owed
     */
    function getSharesFromReceipt(
        Vault.DepositReceipt memory depositReceipt,
        uint256 currentRound,
        uint256 assetPerShare,
        uint256 decimals
    ) internal pure returns (uint256 unredeemedShares) {
        if (depositReceipt.round > 0 && depositReceipt.round < currentRound) {
            uint256 sharesFromRound =
                assetToShares(depositReceipt.amount, assetPerShare, decimals);

            return
                uint256(depositReceipt.unredeemedShares).add(sharesFromRound);
        }
        return depositReceipt.unredeemedShares;
    }

    function pricePerShare(
        uint256 totalSupply,
        uint256 totalBalance,
        uint256 pendingAmount,
        uint256 decimals
    ) internal pure returns (uint256) {
        uint256 singleShare = 10**decimals;
        return
            totalSupply > 0
                ? singleShare.mul(totalBalance.sub(pendingAmount)).div(
                    totalSupply
                )
                : singleShare;
    }

    /************************************************
     *  HELPERS
     ***********************************************/

    function assertUint104(uint256 num) internal pure {
        require(num <= type(uint104).max, "Overflow uint104");
    }

    function assertUint128(uint256 num) internal pure {
        require(num <= type(uint128).max, "Overflow uint128");
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

interface ILiquidityGauge {
    function balanceOf(address) external view returns (uint256);

    function deposit(
        uint256 _value,
        address _addr,
        bool _claim_rewards
    ) external;

    function withdraw(uint256 _value) external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

interface IVaultPauser {
    /// @notice pause vault position of an account with max amount
    /// @param _account the address of user
    /// @param _amount amount of shares
    function pausePosition(address _account, uint256 _amount) external;

    /// @notice resume vault position of an account with max amount
    /// @param _vaultAddress the address of vault
    function resumePosition(address _vaultAddress) external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

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

import {Vault} from "../../../libraries/Vault.sol";
import {VaultLifecycle} from "../../../libraries/VaultLifecycle.sol";
import {ShareMath} from "../../../libraries/ShareMath.sol";
import {IWETH} from "../../../interfaces/IWETH.sol";

contract RibbonVault is
    ReentrancyGuardUpgradeable,
    OwnableUpgradeable,
    ERC20Upgradeable
{
    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    using ShareMath for Vault.DepositReceipt;

    /************************************************
     *  NON UPGRADEABLE STORAGE
     ***********************************************/

    /// @notice Stores the user's pending deposit for the round
    mapping(address => Vault.DepositReceipt) public depositReceipts;

    /// @notice On every round's close, the pricePerShare value of an rTHETA token is stored
    /// This is used to determine the number of shares to be returned
    /// to a user with their DepositReceipt.depositAmount
    mapping(uint256 => uint256) public roundPricePerShare;

    /// @notice Stores pending user withdrawals
    mapping(address => Vault.Withdrawal) public withdrawals;

    /// @notice Vault's parameters like cap, decimals
    Vault.VaultParams public vaultParams;

    /// @notice Vault's lifecycle state like round and locked amounts
    Vault.VaultState public vaultState;

    /// @notice Vault's state of the options sold and the timelocked option
    Vault.OptionState public optionState;

    /// @notice Fee recipient for the performance and management fees
    address public feeRecipient;

    /// @notice role in charge of weekly vault operations such as rollToNextOption and burnRemainingOTokens
    // no access to critical vault changes
    address public keeper;

    /// @notice Performance fee charged on premiums earned in rollToNextOption. Only charged when there is no loss.
    uint256 public performanceFee;

    /// @notice Management fee charged on entire AUM in rollToNextOption. Only charged when there is no loss.
    uint256 public managementFee;

    // Gap is left to avoid storage collisions. Though RibbonVault is not upgradeable, we add this as a safety measure.
    uint256[30] private ____gap;

    // *IMPORTANT* NO NEW STORAGE VARIABLES SHOULD BE ADDED HERE
    // This is to prevent storage collisions. All storage variables should be appended to RibbonThetaVaultStorage
    // or RibbonDeltaVaultStorage instead. Read this documentation to learn more:
    // https://docs.openzeppelin.com/upgrades-plugins/1.x/writing-upgradeable#modifying-your-contracts

    /************************************************
     *  IMMUTABLES & CONSTANTS
     ***********************************************/

    /// @notice WETH9 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
    address public immutable WETH;

    /// @notice USDC 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
    address public immutable USDC;

    /// @notice Deprecated: 15 minute timelock between commitAndClose and rollToNexOption.
    uint256 public constant DELAY = 0;

    /// @notice 7 day period between each options sale.
    uint256 public constant PERIOD = 7 days;

    // Number of weeks per year = 52.142857 weeks * FEE_MULTIPLIER = 52142857
    // Dividing by weeks per year requires doing num.mul(FEE_MULTIPLIER).div(WEEKS_PER_YEAR)
    uint256 private constant WEEKS_PER_YEAR = 52142857;

    // GAMMA_CONTROLLER is the top-level contract in Gamma protocol
    // which allows users to perform multiple actions on their vaults
    // and positions https://github.com/opynfinance/GammaProtocol/blob/master/contracts/core/Controller.sol
    address public immutable GAMMA_CONTROLLER;

    // MARGIN_POOL is Gamma protocol's collateral pool.
    // Needed to approve collateral.safeTransferFrom for minting otokens.
    // https://github.com/opynfinance/GammaProtocol/blob/master/contracts/core/MarginPool.sol
    address public immutable MARGIN_POOL;

    // GNOSIS_EASY_AUCTION is Gnosis protocol's contract for initiating auctions and placing bids
    // https://github.com/gnosis/ido-contracts/blob/main/contracts/EasyAuction.sol
    address public immutable GNOSIS_EASY_AUCTION;

    /************************************************
     *  EVENTS
     ***********************************************/

    event Deposit(address indexed account, uint256 amount, uint256 round);

    event InitiateWithdraw(
        address indexed account,
        uint256 shares,
        uint256 round
    );

    event Redeem(address indexed account, uint256 share, uint256 round);

    event ManagementFeeSet(uint256 managementFee, uint256 newManagementFee);

    event PerformanceFeeSet(uint256 performanceFee, uint256 newPerformanceFee);

    event CapSet(uint256 oldCap, uint256 newCap);

    event Withdraw(address indexed account, uint256 amount, uint256 shares);

    event CollectVaultFees(
        uint256 performanceFee,
        uint256 vaultFee,
        uint256 round,
        address indexed feeRecipient
    );

    /************************************************
     *  CONSTRUCTOR & INITIALIZATION
     ***********************************************/

    /**
     * @notice Initializes the contract with immutable variables
     * @param _weth is the Wrapped Ether contract
     * @param _usdc is the USDC contract
     * @param _gammaController is the contract address for opyn actions
     * @param _marginPool is the contract address for providing collateral to opyn
     * @param _gnosisEasyAuction is the contract address that facilitates gnosis auctions
     */
    constructor(
        address _weth,
        address _usdc,
        address _gammaController,
        address _marginPool,
        address _gnosisEasyAuction
    ) {
        require(_weth != address(0), "!_weth");
        require(_usdc != address(0), "!_usdc");
        require(_gnosisEasyAuction != address(0), "!_gnosisEasyAuction");
        require(_gammaController != address(0), "!_gammaController");
        require(_marginPool != address(0), "!_marginPool");

        WETH = _weth;
        USDC = _usdc;
        GAMMA_CONTROLLER = _gammaController;
        MARGIN_POOL = _marginPool;
        GNOSIS_EASY_AUCTION = _gnosisEasyAuction;
    }

    /**
     * @notice Initializes the OptionVault contract with storage variables.
     */
    function baseInitialize(
        address _owner,
        address _keeper,
        address _feeRecipient,
        uint256 _managementFee,
        uint256 _performanceFee,
        string memory _tokenName,
        string memory _tokenSymbol,
        Vault.VaultParams calldata _vaultParams
    ) internal initializer {
        VaultLifecycle.verifyInitializerParams(
            _owner,
            _keeper,
            _feeRecipient,
            _performanceFee,
            _managementFee,
            _tokenName,
            _tokenSymbol,
            _vaultParams
        );

        __ReentrancyGuard_init();
        __ERC20_init(_tokenName, _tokenSymbol);
        __Ownable_init();
        transferOwnership(_owner);

        keeper = _keeper;

        feeRecipient = _feeRecipient;
        performanceFee = _performanceFee;
        managementFee = _managementFee.mul(Vault.FEE_MULTIPLIER).div(
            WEEKS_PER_YEAR
        );
        vaultParams = _vaultParams;

        uint256 assetBalance =
            IERC20(vaultParams.asset).balanceOf(address(this));
        ShareMath.assertUint104(assetBalance);
        vaultState.lastLockedAmount = uint104(assetBalance);

        vaultState.round = 1;
    }

    /**
     * @dev Throws if called by any account other than the keeper.
     */
    modifier onlyKeeper() {
        require(msg.sender == keeper, "!keeper");
        _;
    }

    /************************************************
     *  SETTERS
     ***********************************************/

    /**
     * @notice Sets the new keeper
     * @param newKeeper is the address of the new keeper
     */
    function setNewKeeper(address newKeeper) external onlyOwner {
        require(newKeeper != address(0), "!newKeeper");
        keeper = newKeeper;
    }

    /**
     * @notice Sets the new fee recipient
     * @param newFeeRecipient is the address of the new fee recipient
     */
    function setFeeRecipient(address newFeeRecipient) external onlyOwner {
        require(newFeeRecipient != address(0), "!newFeeRecipient");
        require(newFeeRecipient != feeRecipient, "Must be new feeRecipient");
        feeRecipient = newFeeRecipient;
    }

    /**
     * @notice Sets the management fee for the vault
     * @param newManagementFee is the management fee (6 decimals). ex: 2 * 10 ** 6 = 2%
     */
    function setManagementFee(uint256 newManagementFee) external onlyOwner {
        require(
            newManagementFee < 100 * Vault.FEE_MULTIPLIER,
            "Invalid management fee"
        );

        // We are dividing annualized management fee by num weeks in a year
        uint256 tmpManagementFee =
            newManagementFee.mul(Vault.FEE_MULTIPLIER).div(WEEKS_PER_YEAR);

        emit ManagementFeeSet(managementFee, newManagementFee);

        managementFee = tmpManagementFee;
    }

    /**
     * @notice Sets the performance fee for the vault
     * @param newPerformanceFee is the performance fee (6 decimals). ex: 20 * 10 ** 6 = 20%
     */
    function setPerformanceFee(uint256 newPerformanceFee) external onlyOwner {
        require(
            newPerformanceFee < 100 * Vault.FEE_MULTIPLIER,
            "Invalid performance fee"
        );

        emit PerformanceFeeSet(performanceFee, newPerformanceFee);

        performanceFee = newPerformanceFee;
    }

    /**
     * @notice Sets a new cap for deposits
     * @param newCap is the new cap for deposits
     */
    function setCap(uint256 newCap) external onlyOwner {
        require(newCap > 0, "!newCap");
        ShareMath.assertUint104(newCap);
        emit CapSet(vaultParams.cap, newCap);
        vaultParams.cap = uint104(newCap);
    }

    /************************************************
     *  DEPOSIT & WITHDRAWALS
     ***********************************************/

    /**
     * @notice Deposits ETH into the contract and mint vault shares. Reverts if the asset is not WETH.
     */
    function depositETH() external payable nonReentrant {
        require(vaultParams.asset == WETH, "!WETH");
        require(msg.value > 0, "!value");

        _depositFor(msg.value, msg.sender);

        IWETH(WETH).deposit{value: msg.value}();
    }

    /**
     * @notice Deposits the `asset` from msg.sender.
     * @param amount is the amount of `asset` to deposit
     */
    function deposit(uint256 amount) external nonReentrant {
        require(amount > 0, "!amount");

        _depositFor(amount, msg.sender);

        // An approve() by the msg.sender is required beforehand
        IERC20(vaultParams.asset).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        );
    }

    /**
     * @notice Deposits the `asset` from msg.sender added to `creditor`'s deposit.
     * @notice Used for vault -> vault deposits on the user's behalf
     * @param amount is the amount of `asset` to deposit
     * @param creditor is the address that can claim/withdraw deposited amount
     */
    function depositFor(uint256 amount, address creditor)
        external
        nonReentrant
    {
        require(amount > 0, "!amount");
        require(creditor != address(0));

        _depositFor(amount, creditor);

        // An approve() by the msg.sender is required beforehand
        IERC20(vaultParams.asset).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        );
    }

    /**
     * @notice Mints the vault shares to the creditor
     * @param amount is the amount of `asset` deposited
     * @param creditor is the address to receieve the deposit
     */
    function _depositFor(uint256 amount, address creditor) private {
        uint256 currentRound = vaultState.round;
        uint256 totalWithDepositedAmount = totalBalance().add(amount);

        require(totalWithDepositedAmount <= vaultParams.cap, "Exceed cap");
        require(
            totalWithDepositedAmount >= vaultParams.minimumSupply,
            "Insufficient balance"
        );

        emit Deposit(creditor, amount, currentRound);

        Vault.DepositReceipt memory depositReceipt = depositReceipts[creditor];

        // If we have an unprocessed pending deposit from the previous rounds, we have to process it.
        uint256 unredeemedShares =
            depositReceipt.getSharesFromReceipt(
                currentRound,
                roundPricePerShare[depositReceipt.round],
                vaultParams.decimals
            );

        uint256 depositAmount = amount;

        // If we have a pending deposit in the current round, we add on to the pending deposit
        if (currentRound == depositReceipt.round) {
            uint256 newAmount = uint256(depositReceipt.amount).add(amount);
            depositAmount = newAmount;
        }

        ShareMath.assertUint104(depositAmount);

        depositReceipts[creditor] = Vault.DepositReceipt({
            round: uint16(currentRound),
            amount: uint104(depositAmount),
            unredeemedShares: uint128(unredeemedShares)
        });

        uint256 newTotalPending = uint256(vaultState.totalPending).add(amount);
        ShareMath.assertUint128(newTotalPending);

        vaultState.totalPending = uint128(newTotalPending);
    }

    /**
     * @notice Initiates a withdrawal that can be processed once the round completes
     * @param numShares is the number of shares to withdraw
     */
    function _initiateWithdraw(uint256 numShares) internal {
        require(numShares > 0, "!numShares");

        // We do a max redeem before initiating a withdrawal
        // But we check if they must first have unredeemed shares
        if (
            depositReceipts[msg.sender].amount > 0 ||
            depositReceipts[msg.sender].unredeemedShares > 0
        ) {
            _redeem(0, true);
        }

        // This caches the `round` variable used in shareBalances
        uint256 currentRound = vaultState.round;
        Vault.Withdrawal storage withdrawal = withdrawals[msg.sender];

        bool withdrawalIsSameRound = withdrawal.round == currentRound;

        emit InitiateWithdraw(msg.sender, numShares, currentRound);

        uint256 existingShares = uint256(withdrawal.shares);

        uint256 withdrawalShares;
        if (withdrawalIsSameRound) {
            withdrawalShares = existingShares.add(numShares);
        } else {
            require(existingShares == 0, "Existing withdraw");
            withdrawalShares = numShares;
            withdrawals[msg.sender].round = uint16(currentRound);
        }

        ShareMath.assertUint128(withdrawalShares);
        withdrawals[msg.sender].shares = uint128(withdrawalShares);

        _transfer(msg.sender, address(this), numShares);
    }

    /**
     * @notice Completes a scheduled withdrawal from a past round. Uses finalized pps for the round
     * @return withdrawAmount the current withdrawal amount
     */
    function _completeWithdraw() internal returns (uint256) {
        Vault.Withdrawal storage withdrawal = withdrawals[msg.sender];

        uint256 withdrawalShares = withdrawal.shares;
        uint256 withdrawalRound = withdrawal.round;

        // This checks if there is a withdrawal
        require(withdrawalShares > 0, "Not initiated");

        require(withdrawalRound < vaultState.round, "Round not closed");

        // We leave the round number as non-zero to save on gas for subsequent writes
        withdrawals[msg.sender].shares = 0;
        vaultState.queuedWithdrawShares = uint128(
            uint256(vaultState.queuedWithdrawShares).sub(withdrawalShares)
        );

        uint256 withdrawAmount =
            ShareMath.sharesToAsset(
                withdrawalShares,
                roundPricePerShare[withdrawalRound],
                vaultParams.decimals
            );

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

        _burn(address(this), withdrawalShares);

        require(withdrawAmount > 0, "!withdrawAmount");
        transferAsset(msg.sender, withdrawAmount);

        return withdrawAmount;
    }

    /**
     * @notice Redeems shares that are owed to the account
     * @param numShares is the number of shares to redeem
     */
    function redeem(uint256 numShares) external nonReentrant {
        require(numShares > 0, "!numShares");
        _redeem(numShares, false);
    }

    /**
     * @notice Redeems the entire unredeemedShares balance that is owed to the account
     */
    function maxRedeem() external nonReentrant {
        _redeem(0, true);
    }

    /**
     * @notice Redeems shares that are owed to the account
     * @param numShares is the number of shares to redeem, could be 0 when isMax=true
     * @param isMax is flag for when callers do a max redemption
     */
    function _redeem(uint256 numShares, bool isMax) internal {
        Vault.DepositReceipt memory depositReceipt =
            depositReceipts[msg.sender];

        // This handles the null case when depositReceipt.round = 0
        // Because we start with round = 1 at `initialize`
        uint256 currentRound = vaultState.round;

        uint256 unredeemedShares =
            depositReceipt.getSharesFromReceipt(
                currentRound,
                roundPricePerShare[depositReceipt.round],
                vaultParams.decimals
            );

        numShares = isMax ? unredeemedShares : numShares;
        if (numShares == 0) {
            return;
        }
        require(numShares <= unredeemedShares, "Exceeds available");

        // If we have a depositReceipt on the same round, BUT we have some unredeemed shares
        // we debit from the unredeemedShares, but leave the amount field intact
        // If the round has past, with no new deposits, we just zero it out for new deposits.
        if (depositReceipt.round < currentRound) {
            depositReceipts[msg.sender].amount = 0;
        }

        ShareMath.assertUint128(numShares);
        depositReceipts[msg.sender].unredeemedShares = uint128(
            unredeemedShares.sub(numShares)
        );

        emit Redeem(msg.sender, numShares, depositReceipt.round);

        _transfer(address(this), msg.sender, numShares);
    }

    /************************************************
     *  VAULT OPERATIONS
     ***********************************************/

    /**
     * @notice Helper function that helps to save gas for writing values into the roundPricePerShare map.
     *         Writing `1` into the map makes subsequent writes warm, reducing the gas from 20k to 5k.
     *         Having 1 initialized beforehand will not be an issue as long as we round down share calculations to 0.
     * @param numRounds is the number of rounds to initialize in the map
     */
    function initRounds(uint256 numRounds) external nonReentrant {
        require(numRounds > 0, "!numRounds");

        uint256 _round = vaultState.round;
        for (uint256 i = 0; i < numRounds; i++) {
            uint256 index = _round + i;
            require(roundPricePerShare[index] == 0, "Initialized"); // AVOID OVERWRITING ACTUAL VALUES
            roundPricePerShare[index] = ShareMath.PLACEHOLDER_UINT;
        }
    }

    /**
     * @notice Helper function that performs most administrative tasks
     * such as setting next option, minting new shares, getting vault fees, etc.
     * @param lastQueuedWithdrawAmount is old queued withdraw amount
     * @param currentQueuedWithdrawShares is the queued withdraw shares for the current round
     * @return newOption is the new option address
     * @return lockedBalance is the new balance used to calculate next option purchase size or collateral size
     * @return queuedWithdrawAmount is the new queued withdraw amount for this round
     */
    function _rollToNextOption(
        uint256 lastQueuedWithdrawAmount,
        uint256 currentQueuedWithdrawShares
    )
        internal
        returns (
            address newOption,
            uint256 lockedBalance,
            uint256 queuedWithdrawAmount
        )
    {
        require(block.timestamp >= optionState.nextOptionReadyAt, "!ready");

        newOption = optionState.nextOption;
        require(newOption != address(0), "!nextOption");

        address recipient = feeRecipient;
        uint256 mintShares;
        uint256 performanceFeeInAsset;
        uint256 totalVaultFee;
        {
            uint256 newPricePerShare;
            (
                lockedBalance,
                queuedWithdrawAmount,
                newPricePerShare,
                mintShares,
                performanceFeeInAsset,
                totalVaultFee
            ) = VaultLifecycle.rollover(
                vaultState,
                VaultLifecycle.RolloverParams(
                    vaultParams.decimals,
                    IERC20(vaultParams.asset).balanceOf(address(this)),
                    totalSupply(),
                    lastQueuedWithdrawAmount,
                    performanceFee,
                    managementFee,
                    currentQueuedWithdrawShares
                )
            );

            optionState.currentOption = newOption;
            optionState.nextOption = address(0);

            // Finalize the pricePerShare at the end of the round
            uint256 currentRound = vaultState.round;
            roundPricePerShare[currentRound] = newPricePerShare;

            emit CollectVaultFees(
                performanceFeeInAsset,
                totalVaultFee,
                currentRound,
                recipient
            );

            vaultState.totalPending = 0;
            vaultState.round = uint16(currentRound + 1);
        }

        _mint(address(this), mintShares);

        if (totalVaultFee > 0) {
            transferAsset(payable(recipient), totalVaultFee);
        }

        return (newOption, lockedBalance, queuedWithdrawAmount);
    }

    /**
     * @notice Helper function to make either an ETH transfer or ERC20 transfer
     * @param recipient is the receiving address
     * @param amount is the transfer amount
     */
    function transferAsset(address recipient, uint256 amount) internal {
        address asset = vaultParams.asset;
        if (asset == WETH) {
            IWETH(WETH).withdraw(amount);
            (bool success, ) = recipient.call{value: amount}("");
            require(success, "Transfer failed");
            return;
        }
        IERC20(asset).safeTransfer(recipient, amount);
    }

    /************************************************
     *  GETTERS
     ***********************************************/

    /**
     * @notice Returns the asset balance held on the vault for the account
     * @param account is the address to lookup balance for
     * @return the amount of `asset` custodied by the vault for the user
     */
    function accountVaultBalance(address account)
        external
        view
        returns (uint256)
    {
        uint256 _decimals = vaultParams.decimals;
        uint256 assetPerShare =
            ShareMath.pricePerShare(
                totalSupply(),
                totalBalance(),
                vaultState.totalPending,
                _decimals
            );
        return
            ShareMath.sharesToAsset(shares(account), assetPerShare, _decimals);
    }

    /**
     * @notice Getter for returning the account's share balance including unredeemed shares
     * @param account is the account to lookup share balance for
     * @return the share balance
     */
    function shares(address account) public view returns (uint256) {
        (uint256 heldByAccount, uint256 heldByVault) = shareBalances(account);
        return heldByAccount.add(heldByVault);
    }

    /**
     * @notice Getter for returning the account's share balance split between account and vault holdings
     * @param account is the account to lookup share balance for
     * @return heldByAccount is the shares held by account
     * @return heldByVault is the shares held on the vault (unredeemedShares)
     */
    function shareBalances(address account)
        public
        view
        returns (uint256 heldByAccount, uint256 heldByVault)
    {
        Vault.DepositReceipt memory depositReceipt = depositReceipts[account];

        if (depositReceipt.round < ShareMath.PLACEHOLDER_UINT) {
            return (balanceOf(account), 0);
        }

        uint256 unredeemedShares =
            depositReceipt.getSharesFromReceipt(
                vaultState.round,
                roundPricePerShare[depositReceipt.round],
                vaultParams.decimals
            );

        return (balanceOf(account), unredeemedShares);
    }

    /**
     * @notice The price of a unit of share denominated in the `asset`
     */
    function pricePerShare() external view returns (uint256) {
        return
            ShareMath.pricePerShare(
                totalSupply(),
                totalBalance(),
                vaultState.totalPending,
                vaultParams.decimals
            );
    }

    /**
     * @notice Returns the vault's total balance, including the amounts locked into a short position
     * @return total balance of the vault, including the amounts locked in third party protocols
     */
    function totalBalance() public view returns (uint256) {
        return
            uint256(vaultState.lockedAmount).add(
                IERC20(vaultParams.asset).balanceOf(address(this))
            );
    }

    /**
     * @notice Returns the token decimals
     */
    function decimals() public view override returns (uint8) {
        return vaultParams.decimals;
    }

    function cap() external view returns (uint256) {
        return vaultParams.cap;
    }

    function nextOptionReadyAt() external view returns (uint256) {
        return optionState.nextOptionReadyAt;
    }

    function currentOption() external view returns (address) {
        return optionState.currentOption;
    }

    function nextOption() external view returns (address) {
        return optionState.nextOption;
    }

    function totalPending() external view returns (uint256) {
        return vaultState.totalPending;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^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;
        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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

/// math.sol -- mixin for inline numerical wizardry

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >0.4.13;

library DSMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "ds-math-sub-underflow");
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x <= y ? x : y;
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x >= y ? x : y;
    }

    function imin(int256 x, int256 y) internal pure returns (int256 z) {
        return x <= y ? x : y;
    }

    function imax(int256 x, int256 y) internal pure returns (int256 z) {
        return x >= y ? x : y;
    }

    uint256 constant WAD = 10**18;
    uint256 constant RAY = 10**27;

    //rounds to zero if x*y < WAD / 2
    function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }

    //rounds to zero if x*y < WAD / 2
    function rmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }

    //rounds to zero if x*y < WAD / 2
    function wdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, WAD), y / 2) / y;
    }

    //rounds to zero if x*y < RAY / 2
    function rdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

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

library AuctionType {
    struct AuctionData {
        IERC20 auctioningToken;
        IERC20 biddingToken;
        uint256 orderCancellationEndDate;
        uint256 auctionEndDate;
        bytes32 initialAuctionOrder;
        uint256 minimumBiddingAmountPerOrder;
        uint256 interimSumBidAmount;
        bytes32 interimOrder;
        bytes32 clearingPriceOrder;
        uint96 volumeClearingPriceOrder;
        bool minFundingThresholdNotReached;
        bool isAtomicClosureAllowed;
        uint256 feeNumerator;
        uint256 minFundingThreshold;
    }
}

interface IGnosisAuction {
    function initiateAuction(
        address _auctioningToken,
        address _biddingToken,
        uint256 orderCancellationEndDate,
        uint256 auctionEndDate,
        uint96 _auctionedSellAmount,
        uint96 _minBuyAmount,
        uint256 minimumBiddingAmountPerOrder,
        uint256 minFundingThreshold,
        bool isAtomicClosureAllowed,
        address accessManagerContract,
        bytes memory accessManagerContractData
    ) external returns (uint256);

    function auctionCounter() external view returns (uint256);

    function auctionData(uint256 auctionId)
        external
        view
        returns (AuctionType.AuctionData memory);

    function auctionAccessManager(uint256 auctionId)
        external
        view
        returns (address);

    function auctionAccessData(uint256 auctionId)
        external
        view
        returns (bytes memory);

    function FEE_DENOMINATOR() external view returns (uint256);

    function feeNumerator() external view returns (uint256);

    function settleAuction(uint256 auctionId) external returns (bytes32);

    function placeSellOrders(
        uint256 auctionId,
        uint96[] memory _minBuyAmounts,
        uint96[] memory _sellAmounts,
        bytes32[] memory _prevSellOrders,
        bytes calldata allowListCallData
    ) external returns (uint64);

    function claimFromParticipantOrder(
        uint256 auctionId,
        bytes32[] memory orders
    ) external returns (uint256, uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

library GammaTypes {
    // vault is a struct of 6 arrays that describe a position a user has, a user can have multiple vaults.
    struct Vault {
        // addresses of oTokens a user has shorted (i.e. written) against this vault
        address[] shortOtokens;
        // addresses of oTokens a user has bought and deposited in this vault
        // user can be long oTokens without opening a vault (e.g. by buying on a DEX)
        // generally, long oTokens will be 'deposited' in vaults to act as collateral
        // in order to write oTokens against (i.e. in spreads)
        address[] longOtokens;
        // addresses of other ERC-20s a user has deposited as collateral in this vault
        address[] collateralAssets;
        // quantity of oTokens minted/written for each oToken address in shortOtokens
        uint256[] shortAmounts;
        // quantity of oTokens owned and held in the vault for each oToken address in longOtokens
        uint256[] longAmounts;
        // quantity of ERC-20 deposited as collateral in the vault for each ERC-20 address in collateralAssets
        uint256[] collateralAmounts;
    }
}

interface IOtoken {
    function underlyingAsset() external view returns (address);

    function strikeAsset() external view returns (address);

    function collateralAsset() external view returns (address);

    function strikePrice() external view returns (uint256);

    function expiryTimestamp() external view returns (uint256);

    function isPut() external view returns (bool);
}

interface IOtokenFactory {
    function getOtoken(
        address _underlyingAsset,
        address _strikeAsset,
        address _collateralAsset,
        uint256 _strikePrice,
        uint256 _expiry,
        bool _isPut
    ) external view returns (address);

    function createOtoken(
        address _underlyingAsset,
        address _strikeAsset,
        address _collateralAsset,
        uint256 _strikePrice,
        uint256 _expiry,
        bool _isPut
    ) external returns (address);

    function getTargetOtokenAddress(
        address _underlyingAsset,
        address _strikeAsset,
        address _collateralAsset,
        uint256 _strikePrice,
        uint256 _expiry,
        bool _isPut
    ) external view returns (address);

    event OtokenCreated(
        address tokenAddress,
        address creator,
        address indexed underlying,
        address indexed strike,
        address indexed collateral,
        uint256 strikePrice,
        uint256 expiry,
        bool isPut
    );
}

interface IController {
    // possible actions that can be performed
    enum ActionType {
        OpenVault,
        MintShortOption,
        BurnShortOption,
        DepositLongOption,
        WithdrawLongOption,
        DepositCollateral,
        WithdrawCollateral,
        SettleVault,
        Redeem,
        Call,
        Liquidate
    }

    struct ActionArgs {
        // type of action that is being performed on the system
        ActionType actionType;
        // address of the account owner
        address owner;
        // address which we move assets from or to (depending on the action type)
        address secondAddress;
        // asset that is to be transfered
        address asset;
        // index of the vault that is to be modified (if any)
        uint256 vaultId;
        // amount of asset that is to be transfered
        uint256 amount;
        // each vault can hold multiple short / long / collateral assets
        // but we are restricting the scope to only 1 of each in this version
        // in future versions this would be the index of the short / long / collateral asset that needs to be modified
        uint256 index;
        // any other data that needs to be passed in for arbitrary function calls
        bytes data;
    }

    struct RedeemArgs {
        // address to which we pay out the oToken proceeds
        address receiver;
        // oToken that is to be redeemed
        address otoken;
        // amount of oTokens that is to be redeemed
        uint256 amount;
    }

    function getPayout(address _otoken, uint256 _amount)
        external
        view
        returns (uint256);

    function operate(ActionArgs[] calldata _actions) external;

    function getAccountVaultCounter(address owner)
        external
        view
        returns (uint256);

    function oracle() external view returns (address);

    function getVault(address _owner, uint256 _vaultId)
        external
        view
        returns (GammaTypes.Vault memory);

    function getProceed(address _owner, uint256 _vaultId)
        external
        view
        returns (uint256);

    function isSettlementAllowed(
        address _underlying,
        address _strike,
        address _collateral,
        uint256 _expiry
    ) external view returns (bool);
}

interface IOracle {
    function setAssetPricer(address _asset, address _pricer) external;

    function updateAssetPricer(address _asset, address _pricer) external;

    function getPrice(address _asset) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;
import {Vault} from "../libraries/Vault.sol";

interface IRibbonVault {
    function deposit(uint256 amount) external;

    function depositETH() external payable;

    function cap() external view returns (uint256);

    function depositFor(uint256 amount, address creditor) external;

    function vaultParams() external view returns (Vault.VaultParams memory);
}

interface IStrikeSelection {
    function getStrikePrice(uint256 expiryTimestamp, bool isPut)
        external
        view
        returns (uint256, uint256);

    function delta() external view returns (uint256);
}

interface IOptionsPremiumPricer {
    function getPremium(
        uint256 strikePrice,
        uint256 timeToExpiry,
        bool isPut
    ) external view returns (uint256);

    function getPremiumInStables(
        uint256 strikePrice,
        uint256 timeToExpiry,
        bool isPut
    ) external view returns (uint256);

    function getOptionDelta(
        uint256 spotPrice,
        uint256 strikePrice,
        uint256 volatility,
        uint256 expiryTimestamp
    ) external view returns (uint256 delta);

    function getUnderlyingPrice() external view returns (uint256);

    function priceOracle() external view returns (address);

    function volatilityOracle() external view returns (address);

    function optionId() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

import {Vault} from "../libraries/Vault.sol";

interface IRibbonThetaVault {
    function currentOption() external view returns (address);

    function nextOption() external view returns (address);

    function vaultParams() external view returns (Vault.VaultParams memory);

    function vaultState() external view returns (Vault.VaultState memory);

    function optionState() external view returns (Vault.OptionState memory);

    function optionAuctionID() external view returns (uint256);

    function pricePerShare() external view returns (uint256);

    function roundPricePerShare(uint256) external view returns (uint256);

    function depositFor(uint256 amount, address creditor) external;

    function initiateWithdraw(uint256 numShares) external;

    function completeWithdraw() external;

    function maxRedeem() external;

    function depositYieldTokenFor(uint256 amount, address creditor) external;

    function symbol() external view returns (string calldata);
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

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

interface IERC20Detailed is IERC20 {
    function decimals() external view returns (uint8);

    function symbol() external view returns (string calldata);

    function name() external view returns (string calldata);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

interface IOptionsPurchaseQueue {
    /**
     * @dev Contains purchase request info
     * @param optionsAmount Amount of options to purchase
     * @param premiums Total premiums the buyer is spending to purchase the options (optionsAmount * ceilingPrice)
     *  We need to track the premiums here since the ceilingPrice could change between the time the purchase was
     *  requested and when the options are sold
     * @param buyer The buyer requesting this purchase
     */
    struct Purchase {
        uint128 optionsAmount; // Slot 0
        uint128 premiums;
        address buyer; // Slot 1
    }

    function purchases(address, uint256)
        external
        view
        returns (
            uint128,
            uint128,
            address
        );

    function totalOptionsAmount(address) external view returns (uint256);

    function vaultAllocatedOptions(address) external view returns (uint256);

    function whitelistedBuyer(address) external view returns (bool);

    function minPurchaseAmount(address) external view returns (uint256);

    function ceilingPrice(address) external view returns (uint256);

    function getPurchases(address vault)
        external
        view
        returns (Purchase[] memory);

    function getPremiums(address vault, uint256 optionsAmount)
        external
        view
        returns (uint256);

    function getOptionsAllocation(address vault, uint256 allocatedOptions)
        external
        view
        returns (uint256);

    function requestPurchase(address vault, uint256 optionsAmount)
        external
        returns (uint256);

    function allocateOptions(uint256 allocatedOptions)
        external
        returns (uint256);

    function sellToBuyers(uint256 settlementPrice) external returns (uint256);

    function cancelAllPurchases(address vault) external;

    function addWhitelist(address buyer) external;

    function removeWhitelist(address buyer) external;

    function setCeilingPrice(address vault, uint256 price) external;

    function setMinPurchaseAmount(address vault, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {
    SafeERC20
} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * This library supports ERC20s that have quirks in their behavior.
 * One such ERC20 is USDT, which requires allowance to be 0 before calling approve.
 * We plan to update this library with ERC20s that display such idiosyncratic behavior.
 */
library SupportsNonCompliantERC20 {
    address private constant USDT = 0xdAC17F958D2ee523a2206206994597C13D831ec7;

    function safeApproveNonCompliant(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        if (address(token) == USDT) {
            SafeERC20.safeApprove(token, spender, 0);
        }
        SafeERC20.safeApprove(token, spender, amount);
    }
}

// SPDX-License-Identifier: MIT

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

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

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

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

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

    function __Ownable_init_unchained() internal initializer {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/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 Contracts guidelines: functions revert
 * instead 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, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two 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_;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 this function is
     * overridden;
     *
     * 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 override returns (uint8) {
        return 18;
    }

    /**
     * @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);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        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] + 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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This 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);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(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:
     *
     * - `account` 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 += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(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 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 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity =0.8.4;

interface IWETH {
    function deposit() external payable;

    function withdraw(uint256) external;

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

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

    function approve(address spender, uint256 amount) external returns (bool);

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

    function decimals() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
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 || !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

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

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

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^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 ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {
    "contracts/libraries/VaultLifecycle.sol": {
      "VaultLifecycle": "0x25af99ff07575ac55fb3c2d1e6b920ba3bf67b40"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb480000000000000000000000007c06792af1632e77cb27a558dc0885338f4bdf8e0000000000000000000000004ccc2339f87f6c59c6893e1a678c2266ca58dc720000000000000000000000005934807cc0654d46755ebd2848840b616256c6ef0000000000000000000000000b7ffc1f4ad541a4ed16b40d8c37f0929158d101

-----Decoded View---------------
Arg [0] : _weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [1] : _usdc (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Arg [2] : _oTokenFactory (address): 0x7C06792Af1632E77cb27a558Dc0885338F4Bdf8E
Arg [3] : _gammaController (address): 0x4ccc2339F87F6c59c6893E1A678c2266cA58dC72
Arg [4] : _marginPool (address): 0x5934807cC0654d46755eBd2848840b616256C6Ef
Arg [5] : _gnosisEasyAuction (address): 0x0b7fFc1f4AD541A4Ed16b40D8c37f0929158D101

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [1] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [2] : 0000000000000000000000007c06792af1632e77cb27a558dc0885338f4bdf8e
Arg [3] : 0000000000000000000000004ccc2339f87f6c59c6893e1a678c2266ca58dc72
Arg [4] : 0000000000000000000000005934807cc0654d46755ebd2848840b616256c6ef
Arg [5] : 0000000000000000000000000b7ffc1f4ad541a4ed16b40d8c37f0929158d101