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// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { Address } from "@openzeppelin/contracts/utils/Address.sol";
import { EnumerableSet } from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

//  DATA
import { MultiCall } from "../libraries/MultiCall.sol";
import { Balance, BalanceOps } from "../libraries/Balances.sol";

/// INTERFACES
import { ICreditFacade, ICreditFacadeExtended } from "../interfaces/ICreditFacade.sol";
import { ICreditManagerV2, ClosureAction } from "../interfaces/ICreditManagerV2.sol";
import { IPriceOracleV2 } from "../interfaces/IPriceOracle.sol";
import { IDegenNFT } from "../interfaces/IDegenNFT.sol";
import { IWETH } from "../interfaces/external/IWETH.sol";

// CONSTANTS

import { LEVERAGE_DECIMALS } from "../libraries/Constants.sol";
import { PERCENTAGE_FACTOR } from "../libraries/PercentageMath.sol";

// EXCEPTIONS
import { ZeroAddressException } from "../interfaces/IErrors.sol";

struct Params {
    /// @dev Maximal amount of new debt that can be taken per block
    uint128 maxBorrowedAmountPerBlock;
    /// @dev True if increasing debt is forbidden
    bool isIncreaseDebtForbidden;
    /// @dev Timestamp of the next expiration (for expirable Credit Facades only)
    uint40 expirationDate;
}

struct Limits {
    /// @dev Minimal borrowed amount per credit account
    uint128 minBorrowedAmount;
    /// @dev Maximum aborrowed amount per credit account
    uint128 maxBorrowedAmount;
}

/// @title CreditFacade
/// @notice User interface for interacting with Credit Manager.
/// @dev CreditFacade provides an interface between the user and the Credit Manager. Direct interactions
/// with the Credit Manager are forbidden. There are two ways the Credit Manager can be interacted with:
/// - Through CreditFacade, which provides all the required account management function: open / close / liquidate / manageDebt,
/// as well as Multicalls that allow to perform multiple actions within a single transaction, with a single health check
/// - Through adapters, which call the Credit Manager directly, but only allow interactions with specific target contracts
contract CreditFacade is ICreditFacade, ReentrancyGuard {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    /// @dev Credit Manager connected to this Credit Facade
    ICreditManagerV2 public immutable creditManager;

    /// @dev Whether the whitelisted mode is active
    bool public immutable whitelisted;

    /// @dev Whether the Credit Facade implements expirable logic
    bool public immutable expirable;

    /// @dev Keeps frequently accessed parameters for storage access optimization
    Params public override params;

    /// @dev Keeps borrowing limits together for storage access optimization
    Limits public override limits;

    /// @dev Address of the underlying token
    address public immutable underlying;

    /// @dev A map that stores whether a user allows a transfer of an account from another user to themselves
    mapping(address => mapping(address => bool))
        public
        override transfersAllowed;

    /// @dev Address of WETH
    address public immutable wethAddress;

    /// @dev Address of the DegenNFT that gatekeeps account openings in whitelisted mode
    address public immutable override degenNFT;

    /// @dev Stores in a compressed state the last block where borrowing happened and the total amount borrowed in that block
    uint256 internal totalBorrowedInBlock;

    /// @dev Stores a set of contracts which have special restrictions applied for security (such as upgradeable contracts)
    EnumerableSet.AddressSet internal upgradeableContracts;

    /// @dev Contract version
    uint256 public constant override version = 2;

    /// @dev Restricts actions for users with opened credit accounts only
    modifier creditConfiguratorOnly() {
        if (msg.sender != creditManager.creditConfigurator())
            revert CreditConfiguratorOnlyException();

        _;
    }

    /// @dev Initializes creditFacade and connects it with CreditManager
    /// @param _creditManager address of Credit Manager
    /// @param _degenNFT address of the DegenNFT or address(0) if whitelisted mode is not used
    /// @param _expirable Whether the CreditFacade can expire and implements expiration-related logic
    constructor(
        address _creditManager,
        address _degenNFT,
        bool _expirable
    ) {
        // Additional check that _creditManager is not address(0)
        if (_creditManager == address(0)) revert ZeroAddressException(); // F:[FA-1]

        creditManager = ICreditManagerV2(_creditManager); // F:[FA-1A]
        underlying = ICreditManagerV2(_creditManager).underlying(); // F:[FA-1A]
        wethAddress = ICreditManagerV2(_creditManager).wethAddress(); // F:[FA-1A]

        degenNFT = _degenNFT; // F:[FA-1A]
        whitelisted = _degenNFT != address(0); // F:[FA-1A]

        expirable = _expirable;
    }

    // Notice: ETH interactions
    // CreditFacade implements a new flow for interacting with WETH compared to V1.
    // During all actions, any sent ETH value is automatically wrapped into WETH and
    // sent back to the message sender. This makes the protocol's behavior regarding
    // ETH more flexible and consistent, since there is no need to pre-wrap WETH before
    // interacting with the protocol, and no need to compute how much unused ETH has to be sent back.

    /// @dev Opens credit account, borrows funds from the pool and pulls collateral
    /// without any additional action.
    /// - Performs sanity checks to determine whether opening an account is allowed
    /// - Wraps ETH to WETH and sends it msg. sender is value > 0
    /// - Requests CreditManager to open a Credit Account with a specified borrowed amount
    /// - Transfers collateral in the underlying asset from the user
    /// - Emits OpenCreditAccount event
    ///
    /// More info: https://dev.gearbox.fi/developers/credit/credit_manager#open-credit-account
    ///
    /// @param amount The amount of collateral provided by the borrower
    /// @param onBehalfOf The address to open an account for. Transfers to it have to be allowed if
    /// msg.sender != obBehalfOf
    /// @param leverageFactor Percentage of the user's own funds to borrow. 100 is equal to 100% - borrows the same amount
    /// as the user's own collateral, equivalent to 2x leverage.
    /// @param referralCode Referral code that is used for potential rewards. 0 if no referral code provided.
    function openCreditAccount(
        uint256 amount,
        address onBehalfOf,
        uint16 leverageFactor,
        uint16 referralCode
    ) external payable override nonReentrant {
        uint256 borrowedAmount = (amount * leverageFactor) / LEVERAGE_DECIMALS; // F:[FA-5]

        // Checks whether the new borrowed amount does not violate the block limit
        _checkAndUpdateBorrowedBlockLimit(borrowedAmount); // F:[FA-11A]

        // Checks that the borrowed amount is within the borrowing limits
        _revertIfOutOfBorrowedLimits(borrowedAmount); // F:[FA-11B]

        // Checks that the msg.sender can open an account for onBehalfOf
        _revertIfOpenCreditAccountNotAllowed(onBehalfOf); // F:[FA-4A, 4B]

        // Wraps ETH and sends it back to msg.sender
        _wrapETH(); // F:[FA-3A]

        // Gets the LT of the underlying
        (, uint256 ltu) = creditManager.collateralTokens(0); // F:[FA-6]

        // In order for the account to pass the health check after opening,
        // the inequality "(amount + borrowedAmount) * LTU > borrowedAmount" must hold
        // this can be transformed into "amount * LTU > borrowedAmount * (1 - LTU)"
        if (amount * ltu <= borrowedAmount * (PERCENTAGE_FACTOR - ltu))
            revert NotEnoughCollateralException(); // F:[FA-6]

        // Opens credit accnount and borrows funds from the pool
        // Returns the new credit account's address
        address creditAccount = creditManager.openCreditAccount(
            borrowedAmount,
            onBehalfOf
        ); // F:[FA-5]

        // Emits openCreditAccount event before adding collateral, so that order of events is correct
        emit OpenCreditAccount(
            onBehalfOf,
            creditAccount,
            borrowedAmount,
            referralCode
        ); // F:[FA-5]

        // Transfers collateral from the user to the new Credit Account
        addCollateral(onBehalfOf, creditAccount, underlying, amount); // F:[FA-5]
    }

    /// @dev Opens a Credit Account and runs a batch of operations in a multicall
    /// - Opens credit account with the desired borrowed amount
    /// - Executes all operations in a multicall
    /// - Checks that the new account has enough collateral
    /// - Emits OpenCreditAccount event
    ///
    /// @param borrowedAmount Debt size
    /// @param onBehalfOf The address to open an account for. Transfers to it have to be allowed if
    /// msg.sender != onBehalfOf
    /// @param calls The array of MultiCall structs encoding the required operations. Generally must have
    /// at least a call to addCollateral, as otherwise the health check at the end will fail.
    /// @param referralCode Referral code which is used for potential rewards. 0 if no referral code provided
    function openCreditAccountMulticall(
        uint256 borrowedAmount,
        address onBehalfOf,
        MultiCall[] calldata calls,
        uint16 referralCode
    ) external payable override nonReentrant {
        // Checks whether the new borrowed amount does not violate the block limit
        _checkAndUpdateBorrowedBlockLimit(borrowedAmount); // F:[FA-11]

        // Checks that the msg.sender can open an account for onBehalfOf
        _revertIfOpenCreditAccountNotAllowed(onBehalfOf); // F:[FA-4A, 4B]

        // Checks that the borrowed amount is within the borrowing limits
        _revertIfOutOfBorrowedLimits(borrowedAmount); // F:[FA-11B]

        // Wraps ETH and sends it back to msg.sender address
        _wrapETH(); // F:[FA-3B]

        // Requests the Credit Manager to open a Credit Account
        address creditAccount = creditManager.openCreditAccount(
            borrowedAmount,
            onBehalfOf
        ); // F:[FA-8]

        // emits a new event
        emit OpenCreditAccount(
            onBehalfOf,
            creditAccount,
            borrowedAmount,
            referralCode
        ); // F:[FA-8]

        // F:[FA-10]: no free flashloans through opening a Credit Account
        // and immediately decreasing debt
        if (calls.length != 0)
            _multicall(calls, onBehalfOf, creditAccount, false, true); // F:[FA-8]

        // Checks that the new credit account has enough collateral to cover the debt
        creditManager.fullCollateralCheck(creditAccount); // F:[FA-8, 9]
    }

    /// @dev Runs a batch of transactions within a multicall and closes the account
    /// - Wraps ETH to WETH and sends it msg.sender if value > 0
    /// - Executes the multicall - the main purpose of a multicall when closing is to convert all assets to underlying
    /// in order to pay the debt.
    /// - Closes credit account:
    ///    + Checks the underlying balance: if it is greater than the amount paid to the pool, transfers the underlying
    ///      from the Credit Account and proceeds. If not, tries to transfer the shortfall from msg.sender.
    ///    + Transfers all enabled assets with non-zero balances to the "to" address, unless they are marked
    ///      to be skipped in skipTokenMask
    ///    + If convertWETH is true, converts WETH into ETH before sending to the recipient
    /// - Emits a CloseCreditAccount event
    ///
    /// @param to Address to send funds to during account closing
    /// @param skipTokenMask Uint-encoded bit mask where 1's mark tokens that shouldn't be transferred
    /// @param convertWETH If true, converts WETH into ETH before sending to "to"
    /// @param calls The array of MultiCall structs encoding the operations to execute before closing the account.
    function closeCreditAccount(
        address to,
        uint256 skipTokenMask,
        bool convertWETH,
        MultiCall[] calldata calls
    ) external payable override nonReentrant {
        // Check for existing CA
        address creditAccount = creditManager.getCreditAccountOrRevert(
            msg.sender
        ); // F:[FA-2]

        // Wraps ETH and sends it back to msg.sender
        _wrapETH(); // F:[FA-3C]

        // [FA-13]: Calls to CreditFacade are forbidden during closure
        if (calls.length != 0)
            _multicall(calls, msg.sender, creditAccount, true, false); // F:[FA-2, 12, 13]

        // Requests the Credit manager to close the Credit Account
        creditManager.closeCreditAccount(
            msg.sender,
            ClosureAction.CLOSE_ACCOUNT,
            0,
            msg.sender,
            to,
            skipTokenMask,
            convertWETH
        ); // F:[FA-2, 12]

        // Emits a CloseCreditAccount event
        emit CloseCreditAccount(msg.sender, to); // F:[FA-12]
    }

    /// @dev Runs a batch of transactions within a multicall and liquidates the account
    /// - Computes the total value and checks that hf < 1. An account can't be liquidated when hf >= 1.
    ///   Total value has to be computed before the multicall, otherwise the liquidator would be able
    ///   to manipulate it.
    /// - Wraps ETH to WETH and sends it to msg.sender (liquidator) if value > 0
    /// - Executes the multicall - the main purpose of a multicall when liquidating is to convert all assets to underlying
    ///   in order to pay the debt.
    /// - Liquidate credit account:
    ///    + Computes the amount that needs to be paid to the pool. If totalValue * liquidationDiscount < borrow + interest + fees,
    ///      only totalValue * liquidationDiscount has to be paid. Since liquidationDiscount < 1, the liquidator can take
    ///      totalValue * (1 - liquidationDiscount) as premium. Also computes the remaining funds to be sent to borrower
    ///      as totalValue * liquidationDiscount - amountToPool.
    ///    + Checks the underlying balance: if it is greater than amountToPool + remainingFunds, transfers the underlying
    ///      from the Credit Account and proceeds. If not, tries to transfer the shortfall from the liquidator.
    ///    + Transfers all enabled assets with non-zero balances to the "to" address, unless they are marked
    ///      to be skipped in skipTokenMask. If the liquidator is confident that all assets were converted
    ///      during the multicall, they can set the mask to uint256.max - 1, to only transfer the underlying
    ///    + If convertWETH is true, converts WETH into ETH before sending
    /// - Emits LiquidateCreditAccount event
    ///
    /// @param to Address to send funds to after liquidation
    /// @param skipTokenMask Uint-encoded bit mask where 1's mark tokens that shouldn't be transferred
    /// @param convertWETH If true, converts WETH into ETH before sending to "to"
    /// @param calls The array of MultiCall structs encoding the operations to execute before liquidating the account.
    function liquidateCreditAccount(
        address borrower,
        address to,
        uint256 skipTokenMask,
        bool convertWETH,
        MultiCall[] calldata calls
    ) external payable override nonReentrant {
        // Checks that the CA exists to revert early for late liquidations and save gas
        address creditAccount = creditManager.getCreditAccountOrRevert(
            borrower
        ); // F:[FA-2]

        // Checks that the to address is not zero
        if (to == address(0)) revert ZeroAddressException(); // F:[FA-16A]

        // Checks that the account hf < 1 and computes the totalValue
        // before the multicall
        (bool isLiquidatable, uint256 totalValue) = _isAccountLiquidatable(
            creditAccount
        ); // F:[FA-14]

        // An account can't be liquidated if hf >= 1
        if (!isLiquidatable)
            revert CantLiquidateWithSuchHealthFactorException(); // F:[FA-14]

        // Wraps ETH and sends it back to msg.sender
        _wrapETH(); // F:[FA-3D]

        // Checks if the liquidation is done while the contract is paused
        bool emergencyLiquidation = _checkIfEmergencyLiquidator(true);

        if (calls.length != 0)
            _multicall(calls, borrower, creditAccount, true, false); // F:[FA-15]

        if (emergencyLiquidation) {
            _checkIfEmergencyLiquidator(false);
        }

        // Liquidates the CA and sends the remaining funds to the borrower
        uint256 remainingFunds = creditManager.closeCreditAccount(
            borrower,
            ClosureAction.LIQUIDATE_ACCOUNT,
            totalValue,
            msg.sender,
            to,
            skipTokenMask,
            convertWETH
        ); // F:[FA-15]

        emit LiquidateCreditAccount(borrower, msg.sender, to, remainingFunds); // F:[FA-15]
    }

    /// @dev Runs a batch of transactions within a multicall and liquidates the account when
    /// this Credit Facade is expired
    /// The general flow of liquidation is nearly the same as normal liquidations, with two main differences:
    ///     - An account can be liquidated on an expired Credit Facade even with hf > 1. However,
    ///       no accounts can be liquidated through this function if the Credit Facade is not expired.
    ///     - Liquidation premiums and fees for liquidating expired accounts are reduced.
    /// It is still possible to normally liquidate an underwater Credit Account, even when the Credit Facade
    /// is expired.
    /// @param to Address to send funds to after liquidation
    /// @param skipTokenMask Uint-encoded bit mask where 1's mark tokens that shouldn't be transferred
    /// @param convertWETH If true, converts WETH into ETH before sending to "to"
    /// @param calls The array of MultiCall structs encoding the operations to execute before liquidating the account.
    /// @notice See more at https://dev.gearbox.fi/docs/documentation/credit/liquidation#liquidating-accounts-by-expiration
    function liquidateExpiredCreditAccount(
        address borrower,
        address to,
        uint256 skipTokenMask,
        bool convertWETH,
        MultiCall[] calldata calls
    ) external payable override nonReentrant {
        // Checks that the CA exists to revert early for late liquidations and save gas
        address creditAccount = creditManager.getCreditAccountOrRevert(
            borrower
        );

        // Checks that the to address is not zero
        if (to == address(0)) revert ZeroAddressException();

        // Checks that this Credit Facade is expired and reverts if not
        if (!_isExpired()) {
            revert CantLiquidateNonExpiredException(); // F: [FA-47,48]
        }

        // Calculates the total value of an account
        (uint256 totalValue, ) = calcTotalValue(creditAccount);

        // Wraps ETH and sends it back to msg.sender address
        _wrapETH();

        // Checks if the liquidsation during pause
        bool emergencyLiquidation = _checkIfEmergencyLiquidator(true);

        if (calls.length != 0)
            _multicall(calls, borrower, creditAccount, true, false); // F:[FA-49]

        if (emergencyLiquidation) {
            _checkIfEmergencyLiquidator(false);
        }

        // Liquidates the CA and sends the remaining funds to the borrower
        uint256 remainingFunds = creditManager.closeCreditAccount(
            borrower,
            ClosureAction.LIQUIDATE_EXPIRED_ACCOUNT,
            totalValue,
            msg.sender,
            to,
            skipTokenMask,
            convertWETH
        ); // F:[FA-49]

        // Emits event
        emit LiquidateExpiredCreditAccount(
            borrower,
            msg.sender,
            to,
            remainingFunds
        ); // F:[FA-49]
    }

    /// @dev Increases debt for msg.sender's Credit Account
    /// - Borrows the requested amount from the pool
    /// - Updates the CA's borrowAmount / cumulativeIndexOpen
    ///   to correctly compute interest going forward
    /// - Performs a full collateral check
    ///
    /// @param amount Amount to borrow
    function increaseDebt(uint256 amount) external override nonReentrant {
        address creditAccount = creditManager.getCreditAccountOrRevert(
            msg.sender
        ); // F:[FA-2]

        _increaseDebt(msg.sender, creditAccount, amount);

        // Checks that the credit account has enough collateral to cover the new borrowed amount
        creditManager.fullCollateralCheck(creditAccount); // F:[FA-17]
    }

    /// @dev IMPLEMENTATION: increaseDebt
    function _increaseDebt(
        address borrower,
        address creditAccount,
        uint256 amount
    ) internal {
        // It is forbidden to take new debt if increaseDebtForbidden mode is enabled
        if (params.isIncreaseDebtForbidden)
            revert IncreaseDebtForbiddenException(); // F:[FA-18C]

        // Checks that the borrowed amount does not violate the per block limit
        _checkAndUpdateBorrowedBlockLimit(amount); // F:[FA-18A]

        // Checks that there are no forbidden tokens, as borrowing
        // is prohibited when forbidden tokens are enabled on the account
        _checkForbiddenTokens(creditAccount);

        // Requests the Credit Manager to borrow additional funds from the pool
        uint256 newBorrowedAmount = creditManager.manageDebt(
            creditAccount,
            amount,
            true
        ); // F:[FA-17]

        // Checks that the new total borrowed amount is within bounds
        _revertIfOutOfBorrowedLimits(newBorrowedAmount); // F:[FA-18B]

        // Emits event
        emit IncreaseBorrowedAmount(borrower, amount); // F:[FA-17]
    }

    /// @dev Checks that there are no intersections between the user's enabled tokens
    /// and the set of forbidden tokens
    /// @notice The main purpose of forbidding tokens is to prevent exposing
    /// pool funds to dangerous or exploited collateral, without immediately
    /// liquidating accounts that hold the forbidden token
    /// There are two ways pool funds can be exposed:
    ///     - The CA owner tries to swap borrowed funds to the forbidden asset:
    ///       this will be blocked by checkAndEnableToken, which is invoked for tokenOut
    ///       after every operation;
    ///     - The CA owner with an already enabled forbidden token transfers it
    ///       to the account - they can't use addCollateral / enableToken due to checkAndEnableToken,
    ///       but can transfer the token directly when it is enabled and it will be counted in the collateral -
    ///       an borrows against it. This check is used to prevent this.
    /// If the owner has a forbidden token and want to take more debt, they must first
    /// dispose of the token and disable it.
    function _checkForbiddenTokens(address creditAccount) internal view {
        uint256 enabledTokenMask = creditManager.enabledTokensMap(
            creditAccount
        );
        uint256 forbiddenTokenMask = creditManager.forbiddenTokenMask();

        if (enabledTokenMask & forbiddenTokenMask > 0) {
            revert ActionProhibitedWithForbiddenTokensException();
        }
    }

    /// @dev Decrease debt
    /// - Decreases the debt by paying the requested amount + accrued interest + fees back to the pool
    /// - It's also include to this payment interest accrued at the moment and fees
    /// - Updates cunulativeIndex to cumulativeIndex now
    ///
    /// @param amount Amount to increase borrowed amount
    function decreaseDebt(uint256 amount) external override nonReentrant {
        address creditAccount = creditManager.getCreditAccountOrRevert(
            msg.sender
        ); // F:[FA-2]

        _decreaseDebt(msg.sender, creditAccount, amount); // F:[FA-19]

        // We need this check, cause after paying debt back, it potentially could be
        // another portfolio structure, which has lower Hf
        creditManager.fullCollateralCheck(creditAccount); // F:[FA-19]
    }

    /// @dev IMPLEMENTATION: decreaseDebt
    function _decreaseDebt(
        address borrower,
        address creditAccount,
        uint256 amount
    ) internal {
        // Requests the creditManager to reduce the borrowed sum by amount
        uint256 newBorrowedAmount = creditManager.manageDebt(
            creditAccount,
            amount,
            false
        ); // F:[FA-19]

        // Checks that the new borrowed amount is within limits
        _revertIfOutOfBorrowedLimits(newBorrowedAmount); // F:[FA-20]

        // Emits an event
        emit DecreaseBorrowedAmount(borrower, amount); // F:[FA-19]
    }

    /// @dev Adds collateral to borrower's credit account
    /// @param onBehalfOf Address of the borrower whose account is funded
    /// @param token Address of a collateral token
    /// @param amount Amount to add
    function addCollateral(
        address onBehalfOf,
        address token,
        uint256 amount
    ) external payable override nonReentrant {
        // Wraps ETH and sends it back to msg.sender
        _wrapETH(); // F:[FA-3E]

        // Checks that onBehalfOf has an account
        address creditAccount = creditManager.getCreditAccountOrRevert(
            onBehalfOf
        ); // F:[FA-2]

        addCollateral(onBehalfOf, creditAccount, token, amount);

        // Since this action can enable new tokens, Credit Manager
        // needs to check that the max enabled token limit is not
        // breached
        creditManager.checkAndOptimizeEnabledTokens(creditAccount); // F: [FA-21C]
    }

    function addCollateral(
        address onBehalfOf,
        address creditAccount,
        address token,
        uint256 amount
    ) internal {
        // Checks that msg.sender can transfer funds to onBehalfOf's account
        // This is done to prevent malicious actors sending bad collateral
        // to users
        // mgs.sender can only add collateral if transfer are approved
        // from itself to onBehalfOf
        _revertIfActionOnAccountNotAllowed(onBehalfOf); // F: [FA-21A]

        // Requests Credit Manager to transfer collateral to the Credit Account
        creditManager.addCollateral(msg.sender, creditAccount, token, amount); // F:[FA-21]

        // Emits event
        emit AddCollateral(onBehalfOf, token, amount); // F:[FA-21]
    }

    /// @dev Executes a batch of transactions within a Multicall, to manage an existing account
    ///  - Wraps ETH and sends it back to msg.sender, if value > 0
    ///  - Executes the Multicall
    ///  - Performs a fullCollateralCheck to verify that hf > 1 after all actions
    /// @param calls The array of MultiCall structs encoding the operations to execute.
    function multicall(MultiCall[] calldata calls)
        external
        payable
        override
        nonReentrant
    {
        // Checks that msg.sender has an account
        address creditAccount = creditManager.getCreditAccountOrRevert(
            msg.sender
        );

        // Wraps ETH and sends it back to msg.sender
        _wrapETH(); // F:[FA-3F]

        if (calls.length != 0) {
            _multicall(calls, msg.sender, creditAccount, false, false);

            // Performs a fullCollateralCheck
            // During a multicall, all intermediary health checks are skipped,
            // as one fullCollateralCheck at the end is sufficient
            creditManager.fullCollateralCheck(creditAccount);
        }
    }

    /// @dev IMPLEMENTATION: multicall
    /// - Transfers ownership from  borrower to this contract, as most adapter and Credit Manager functions retrieve
    ///   the Credit Account by msg.sender
    /// - Executes the provided list of calls:
    ///   + if targetContract == address(this), parses call data in the struct and calls the appropriate function (see _processCreditFacadeMulticall below)
    ///   + if targetContract == adapter, calls the adapter with call data as provided. Adapters skip health checks when Credit Facade is the msg.sender,
    ///     as it performs the necessary health checks on its own
    /// @param borrower Owner of the Credit Account
    /// @param creditAccount Credit Account address
    /// @param isClosure Whether the multicall is being invoked during a closure action. Calls to Credit Facade are forbidden inside
    ///                  multicalls on closure.
    /// @param increaseDebtWasCalled True if debt was increased before or during the multicall. Used to prevent free flashloans by
    ///                  increasing and decreasing debt within a single multicall.
    function _multicall(
        MultiCall[] calldata calls,
        address borrower,
        address creditAccount,
        bool isClosure,
        bool increaseDebtWasCalled
    ) internal {
        // Takes ownership of the Credit Account
        creditManager.transferAccountOwnership(borrower, address(this)); // F:[FA-26]

        // Emits event for multicall start - used in analytics to track actions within multicalls
        emit MultiCallStarted(borrower); // F:[FA-26]

        // Declares the expectedBalances array, which can later be used for slippage control
        Balance[] memory expectedBalances;

        uint256 len = calls.length; // F:[FA-26]
        for (uint256 i = 0; i < len; ) {
            MultiCall calldata mcall = calls[i]; // F:[FA-26]

            // Reverts of calldata has less than 4 bytes
            if (mcall.callData.length < 4) revert IncorrectCallDataException(); // F:[FA-22]

            if (mcall.target == address(this)) {
                // No internal calls on closure except slippage control, to avoid loss manipulation
                if (isClosure) {
                    bytes4 method = bytes4(mcall.callData);
                    if (
                        method !=
                        ICreditFacadeExtended.revertIfReceivedLessThan.selector
                    ) revert ForbiddenDuringClosureException(); // F:[FA-13]
                }

                //
                // CREDIT FACADE
                //

                // increaseDebtWasCalled and expectedBalances are parameters that persist throughout multicall,
                // therefore they are passed to the internal function processor, which returns updated values
                (
                    increaseDebtWasCalled,
                    expectedBalances
                ) = _processCreditFacadeMulticall(
                    borrower,
                    creditAccount,
                    mcall.callData,
                    increaseDebtWasCalled,
                    expectedBalances
                );
            } else {
                //
                // ADAPTERS
                //

                // Checks that the target is an allowed adapter and not CreditManager
                // As CreditFacade has powerful permissions in CreditManagers,
                // functionCall to it is strictly forbidden, even if
                // the Configurator adds it as an adapter
                if (
                    creditManager.adapterToContract(mcall.target) ==
                    address(0) ||
                    mcall.target == address(creditManager)
                ) revert TargetContractNotAllowedException(); // F:[FA-24]

                // Makes a call
                mcall.target.functionCall(mcall.callData); // F:[FA-29]
            }

            unchecked {
                ++i;
            }
        }

        // If expectedBalances was set by calling revertIfGetLessThan,
        // checks that actual token balances are not less than expected balances
        if (expectedBalances.length != 0)
            _compareBalances(expectedBalances, creditAccount);

        // Emits event for multicall end - used in analytics to track actions within multicalls
        emit MultiCallFinished(); // F:[FA-27,27,29]

        // Returns ownership back to the borrower
        creditManager.transferAccountOwnership(address(this), borrower); // F:[FA-27,27,29]
    }

    /// @dev Internal function for processing calls to Credit Facade within the multicall
    /// @param borrower Original owner of the Credit Account
    /// @param creditAccount Credit Account address
    /// @param callData Call data of the currently processed call
    /// @param increaseDebtWasCalledBefore Whether debt was increased before entering the function
    /// @param expectedBalances Array of expected balances before entering the function
    function _processCreditFacadeMulticall(
        address borrower,
        address creditAccount,
        bytes calldata callData,
        bool increaseDebtWasCalledBefore,
        Balance[] memory expectedBalancesBefore
    )
        internal
        returns (bool increaseDebtWasCalled, Balance[] memory expectedBalances)
    {
        increaseDebtWasCalled = increaseDebtWasCalledBefore;
        expectedBalances = expectedBalancesBefore;

        bytes4 method = bytes4(callData);

        //
        // REVERT_IF_GET_LESS_THAN
        //

        // This is an extension function that instructs CreditFacade to check token balances at the end
        // Used to control slippage after the entire sequence of operations, since tracking slippage
        // On each operation is not ideal
        if (method == ICreditFacadeExtended.revertIfReceivedLessThan.selector) {
            // Method can only be called once since the provided Balance array
            // contains deltas that are added to the current balances
            // Calling this function again could potentially override old values
            // and cause confusion, especially if called later in the MultiCall
            if (expectedBalances.length != 0)
                revert ExpectedBalancesAlreadySetException(); // F:[FA-45A]

            // Retrieves the balance list from calldata
            expectedBalances = abi.decode(callData[4:], (Balance[])); // F:[FA-45]

            // Sets expected balances to currentBalance + delta
            expectedBalances = _storeBalances(expectedBalances, creditAccount); // F:[FA-45]
        }
        //
        // ADD COLLATERAL
        //
        else if (method == ICreditFacade.addCollateral.selector) {
            // Parses parameters from calldata
            (address onBehalfOf, address token, uint256 amount) = abi.decode(
                callData[4:],
                (address, address, uint256)
            ); // F:[FA-26, 27]

            // In case onBehalfOf isn't the owner of the currently processed account,
            // retrieves onBehalfOf's account
            addCollateral(
                onBehalfOf,
                onBehalfOf == borrower
                    ? creditAccount
                    : creditManager.getCreditAccountOrRevert(onBehalfOf),
                token,
                amount
            ); // F:[FA-26, 27]
        }
        //
        // INCREASE DEBT
        //
        else if (method == ICreditFacade.increaseDebt.selector) {
            // Sets increaseDebtWasCalled to prevent debt reductions afterwards,
            // as that could be used to get free flash loans
            increaseDebtWasCalled = true; // F:[FA-28]

            // Parses parameters from calldata
            uint256 amount = abi.decode(callData[4:], (uint256)); // F:[FA-26]
            _increaseDebt(borrower, creditAccount, amount); // F:[FA-26]
        }
        //
        // DECREASE DEBT
        //
        else if (method == ICreditFacade.decreaseDebt.selector) {
            // it's forbidden to call decreaseDebt after increaseDebt, in the same multicall
            if (increaseDebtWasCalled)
                revert IncreaseAndDecreaseForbiddenInOneCallException(); // F:[FA-28]

            // Parses parameters from calldata
            uint256 amount = abi.decode(callData[4:], (uint256)); // F:[FA-27]

            _decreaseDebt(borrower, creditAccount, amount); // F:[FA-27]
        }
        //
        // ENABLE TOKEN
        //
        else if (method == ICreditFacade.enableToken.selector) {
            // Parses token
            address token = abi.decode(callData[4:], (address)); // F: [FA-53]

            // Executes enableToken for creditAccount
            _enableToken(borrower, creditAccount, token); // F: [FA-53]
        }
        //
        // DISABLE TOKEN
        //
        // This is an extenstion method used to disable tokens on a Credit Account
        // Can be used to remove troublesome tokens (e.g., forbidden tokens) from an account
        else if (method == ICreditFacadeExtended.disableToken.selector) {
            // Parses token
            address token = abi.decode(callData[4:], (address)); // F: [FA-54]

            // Executes disableToken for creditAccount
            _disableToken(borrower, creditAccount, token); // F: [FA-54]
        } else {
            // Reverts if the passed selector is unrecognized
            revert UnknownMethodException(); // F:[FA-23]
        }
    }

    /// @dev Adds expected deltas to current balances on a Credit account and returns the result
    /// @param expected Expected changes to existing balances
    /// @param creditAccount Credit Account to compute balances for
    function _storeBalances(Balance[] memory expected, address creditAccount)
        internal
        view
        returns (Balance[] memory)
    {
        uint256 len = expected.length; // F:[FA-45]
        for (uint256 i = 0; i < len; ) {
            expected[i].balance += IERC20(expected[i].token).balanceOf(
                creditAccount
            ); // F:[FA-45]
            unchecked {
                ++i;
            }
        }

        return expected; // F:[FA-45]
    }

    /// @dev Compares current balances to previously saved expected balances.
    /// Reverts if at least one balance is lower than expected
    /// @param expected Expected balances after all operations
    /// @param creditAccount Credit Account to check
    function _compareBalances(Balance[] memory expected, address creditAccount)
        internal
        view
    {
        uint256 len = expected.length; // F:[FA-45]
        for (uint256 i = 0; i < len; ) {
            if (
                IERC20(expected[i].token).balanceOf(creditAccount) <
                expected[i].balance
            ) revert BalanceLessThanMinimumDesiredException(expected[i].token); // F:[FA-45]
            unchecked {
                ++i;
            }
        }
    }

    /// @dev Sets token allowance from msg.sender's Credit Account to a connected target contract
    /// @param targetContract Contract to set allowance to. Cannot be in the list of upgradeable contracts
    /// @param token Token address
    /// @param amount Allowance amount
    function approve(
        address targetContract,
        address token,
        uint256 amount
    ) external override nonReentrant {
        // Checks that targetContract is a non-zero address and is not in the upgradeable contracts list
        // If an upgradeable contract is compromised, and an attacker is able to call transferFrom from it,
        // they would be able to steal funds from Credit Accounts while circumventing all health checks
        // Thus, this action is only allowed for immutable and highly secure contracts
        if (
            creditManager.contractToAdapter(targetContract) == address(0) ||
            upgradeableContracts.contains(targetContract)
        )
            // F: [FA-51]
            revert TargetContractNotAllowedException(); // F:[FA-30]

        // Requests Credit Manager to set token allowance from Credit Account to contract
        creditManager.approveCreditAccount(
            msg.sender,
            targetContract,
            token,
            amount
        ); // F:[FA-31]
    }

    /// @dev Transfers credit account to another user
    /// By default, this action is forbidden, and the user has to approve transfers from sender to itself
    /// by calling approveAccountTransfer.
    /// This is done to prevent malicious actors from transferring compromised accounts to other users.
    /// @param to Address to transfer the account to
    function transferAccountOwnership(address to)
        external
        override
        nonReentrant
    {
        // In whitelisted mode only select addresses can have Credit Accounts
        // So this action is prohibited
        if (whitelisted) revert NotAllowedInWhitelistedMode(); // F:[FA-32]

        address creditAccount = creditManager.getCreditAccountOrRevert(
            msg.sender
        ); // F:[FA-2]

        // Checks that transfer is allowed
        if (!transfersAllowed[msg.sender][to])
            revert AccountTransferNotAllowedException(); // F:[FA-33]

        /// Checks that the account hf > 1, as it is forbidden to transfer
        /// accounts that are liquidatable
        (bool isLiquidatable, ) = _isAccountLiquidatable(creditAccount); // F:[FA-34]

        if (isLiquidatable) revert CantTransferLiquidatableAccountException(); // F:[FA-34]

        // Requests the Credit Manager to transfer the account
        creditManager.transferAccountOwnership(msg.sender, to); // F:[FA-35]

        // Emits event
        emit TransferAccount(msg.sender, to); // F:[FA-35]
    }

    /// @dev Verifies that the msg.sender can open an account for onBehalfOf
    /// -  For expirable Credit Facade, expiration date must not be reached
    /// -  For whitelisted mode, msg.sender must open the account for themselves
    ///    and have at least one DegenNFT to burn
    /// -  Otherwise, checks that account transfers from msg.sender to onBehalfOf
    ///    are approved
    /// @param onBehalfOf Account which would own credit account
    function _revertIfOpenCreditAccountNotAllowed(address onBehalfOf) internal {
        // Opening new Credit Accounts is prohibited in increaseDebtForbidden mode
        if (params.isIncreaseDebtForbidden)
            revert IncreaseDebtForbiddenException(); // F:[FA-7]

        // Checks that this CreditFacade is not expired
        if (_isExpired()) {
            revert OpenAccountNotAllowedAfterExpirationException(); // F: [FA-46]
        }

        // F:[FA-5] covers case when degenNFT == address(0)
        if (degenNFT != address(0)) {
            // F:[FA-4B]

            // In whitelisted mode, users can only open an account by burning a DegenNFT
            // And opening an account for another address is forbidden
            if (whitelisted && msg.sender != onBehalfOf)
                revert NotAllowedInWhitelistedMode(); // F:[FA-4B]

            IDegenNFT(degenNFT).burn(onBehalfOf, 1); // F:[FA-4B]
        }

        _revertIfActionOnAccountNotAllowed(onBehalfOf);
    }

    /// @dev Checks if the message sender is allowed to do an action on a CA
    /// @param onBehalfOf The account which owns the target CA
    function _revertIfActionOnAccountNotAllowed(address onBehalfOf)
        internal
        view
    {
        // msg.sender must either be the account owner themselves,
        // or be approved for transfers
        if (
            msg.sender != onBehalfOf &&
            !transfersAllowed[msg.sender][onBehalfOf]
        ) revert AccountTransferNotAllowedException(); // F:[FA-04C]
    }

    /// @dev Checks that the per-block borrow limit was not violated and updates the
    /// amount borrowed in current block
    function _checkAndUpdateBorrowedBlockLimit(uint256 amount) internal {
        // Skipped in whitelisted mode, since there is a strict limit on the number
        // of credit accounts that can be opened, which implies a limit on borrowing
        if (!whitelisted) {
            uint256 _limitPerBlock = params.maxBorrowedAmountPerBlock; // F:[FA-18]

            // If the limit is unit128.max, the check is disabled
            // F:[FA-36] test case when _limitPerBlock == type(uint128).max
            if (_limitPerBlock != type(uint128).max) {
                (
                    uint64 lastBlock,
                    uint128 lastLimit
                ) = getTotalBorrowedInBlock(); // F:[FA-18, 37]

                uint256 newLimit = (lastBlock == block.number)
                    ? amount + lastLimit // F:[FA-37]
                    : amount; // F:[FA-18, 37]

                if (newLimit > _limitPerBlock)
                    revert BorrowedBlockLimitException(); // F:[FA-18]

                _updateTotalBorrowedInBlock(uint128(newLimit)); // F:[FA-37]
            }
        }
    }

    /// @dev Checks that the borrowed principal is within borrowing limits
    /// @param borrowedAmount The current principal of a Credit Account
    function _revertIfOutOfBorrowedLimits(uint256 borrowedAmount)
        internal
        view
    {
        // Checks that amount is in limits
        if (
            borrowedAmount < uint256(limits.minBorrowedAmount) ||
            borrowedAmount > uint256(limits.maxBorrowedAmount)
        ) revert BorrowAmountOutOfLimitsException(); // F:
    }

    function _checkIfEmergencyLiquidator(bool state) internal returns (bool) {
        return creditManager.checkEmergencyPausable(msg.sender, state);
    }

    /// @dev Returns the last block where debt was taken,
    ///      and the total amount borrowed in that block
    function getTotalBorrowedInBlock()
        public
        view
        returns (uint64 blockLastUpdate, uint128 borrowedInBlock)
    {
        blockLastUpdate = uint64(totalBorrowedInBlock >> 128); // F:[FA-37]
        borrowedInBlock = uint128(totalBorrowedInBlock & type(uint128).max); // F:[FA-37]
    }

    /// @dev Saves the total amount borrowed in the current block for future checks
    /// @param borrowedInBlock Updated total borrowed amount
    function _updateTotalBorrowedInBlock(uint128 borrowedInBlock) internal {
        totalBorrowedInBlock = uint256(block.number << 128) | borrowedInBlock; // F:[FA-37]
    }

    /// @dev Approves account transfer from another user to msg.sender
    /// @param from Address for which account transfers are allowed/forbidden
    /// @param state True is transfer is allowed, false if forbidden
    function approveAccountTransfer(address from, bool state)
        external
        override
        nonReentrant
    {
        transfersAllowed[from][msg.sender] = state; // F:[FA-38]

        // Emits event
        emit TransferAccountAllowed(from, msg.sender, state); // F:[FA-38]
    }

    /// @dev Enables token in enabledTokenMask for the Credit Account of msg.sender
    /// @param token Address of token to enable
    function enableToken(address token) external override nonReentrant {
        address creditAccount = creditManager.getCreditAccountOrRevert(
            msg.sender
        ); // F:[FA-2]

        _enableToken(msg.sender, creditAccount, token);

        // Since this action potentially increases the number of enabled tokens,
        // the Credit Manager is requested to check that the max limit for enabled tokens
        // is not violated
        creditManager.checkAndOptimizeEnabledTokens(creditAccount); // F: [FA-39A]
    }

    /// @dev IMPLEMENTATION: enableToken
    /// @param creditAccount Account for which the token is enabled
    /// @param token Collateral token to enabled
    function _enableToken(
        address borrower,
        address creditAccount,
        address token
    ) internal {
        // Will revert if the token is not known or forbidden,
        // If the token is disabled, adds the respective bit to the mask, otherwise does nothing
        creditManager.checkAndEnableToken(creditAccount, token); // F:[FA-39]

        // Emits event
        emit TokenEnabled(borrower, token);
    }

    function _disableToken(
        address borrower,
        address creditAccount,
        address token
    ) internal {
        // If the token is enabled, removes a respective bit from the mask,
        // otherwise does nothing
        if (creditManager.disableToken(creditAccount, token)) {
            // Emits event
            emit TokenDisabled(borrower, token);
        } // F: [FA-54]
    }

    //
    // GETTERS
    //

    /// @dev Returns true if token is a collateral token and is not forbidden,
    /// otherwise returns false
    /// @param token Token to check
    function isTokenAllowed(address token)
        public
        view
        override
        returns (bool allowed)
    {
        uint256 tokenMask = creditManager.tokenMasksMap(token); // F:[FA-40]
        allowed =
            (tokenMask != 0) &&
            (creditManager.forbiddenTokenMask() & tokenMask == 0); // F:[FA-40]
    }

    /// @dev Calculates total value for provided Credit Account in underlying
    /// More: https://dev.gearbox.fi/developers/credit/economy#totalUSD-value
    ///
    /// @param creditAccount Credit Account address
    /// @return total Total value in underlying
    /// @return twv Total weighted (discounted by liquidation thresholds) value in underlying
    function calcTotalValue(address creditAccount)
        public
        view
        override
        returns (uint256 total, uint256 twv)
    {
        IPriceOracleV2 priceOracle = IPriceOracleV2(
            creditManager.priceOracle()
        ); // F:[FA-41]

        (uint256 totalUSD, uint256 twvUSD) = _calcTotalValueUSD(
            priceOracle,
            creditAccount
        );
        total = priceOracle.convertFromUSD(totalUSD, underlying); // F:[FA-41]
        twv =
            priceOracle.convertFromUSD(twvUSD, underlying) /
            PERCENTAGE_FACTOR; // F:[FA-41]
    }

    /// @dev Calculates total value for provided Credit Account in USD
    /// @param priceOracle Oracle used to convert assets to USD
    /// @param creditAccount Address of the Credit Account
    /// @return totalUSD Total value of the account in USD
    /// @return twvUSD Total weighted (discounted by liquidation thresholds) value in USD
    function _calcTotalValueUSD(
        IPriceOracleV2 priceOracle,
        address creditAccount
    ) internal view returns (uint256 totalUSD, uint256 twvUSD) {
        uint256 tokenMask = 1;
        uint256 enabledTokensMask = creditManager.enabledTokensMap(
            creditAccount
        ); // F:[FA-41]

        while (tokenMask <= enabledTokensMask) {
            if (enabledTokensMask & tokenMask != 0) {
                (address token, uint16 liquidationThreshold) = creditManager
                    .collateralTokensByMask(tokenMask);
                uint256 balance = IERC20(token).balanceOf(creditAccount); // F:[FA-41]

                if (balance > 1) {
                    uint256 value = priceOracle.convertToUSD(balance, token); // F:[FA-41]

                    unchecked {
                        totalUSD += value; // F:[FA-41]
                    }
                    twvUSD += value * liquidationThreshold; // F:[FA-41]
                }
            } // T:[FA-41]

            tokenMask = tokenMask << 1; // F:[FA-41]
        }
    }

    /**
     * @dev Calculates health factor for the credit account
     *
     *          sum(asset[i] * liquidation threshold[i])
     *   Hf = --------------------------------------------
     *         borrowed amount + interest accrued + fees
     *
     *
     * More info: https://dev.gearbox.fi/developers/credit/economy#health-factor
     *
     * @param creditAccount Credit account address
     * @return hf = Health factor in bp (see PERCENTAGE FACTOR in PercentageMath.sol)
     */
    function calcCreditAccountHealthFactor(address creditAccount)
        public
        view
        override
        returns (uint256 hf)
    {
        (, uint256 twv) = calcTotalValue(creditAccount); // F:[FA-42]
        (, , uint256 borrowAmountWithInterestAndFees) = creditManager
            .calcCreditAccountAccruedInterest(creditAccount); // F:[FA-42]
        hf = (twv * PERCENTAGE_FACTOR) / borrowAmountWithInterestAndFees; // F:[FA-42]
    }

    /// @dev Returns true if the borrower has an open Credit Account
    /// @param borrower Borrower address
    function hasOpenedCreditAccount(address borrower)
        public
        view
        override
        returns (bool)
    {
        return creditManager.creditAccounts(borrower) != address(0); // F:[FA-43]
    }

    /// @dev Wraps ETH into WETH and sends it back to msg.sender
    function _wrapETH() internal {
        if (msg.value > 0) {
            IWETH(wethAddress).deposit{ value: msg.value }(); // F:[FA-3]
            IWETH(wethAddress).transfer(msg.sender, msg.value); // F:[FA-3]
        }
    }

    /// @dev Checks if account is liquidatable (i.e., hf < 1)
    /// @param creditAccount Address of credit account to check
    /// @return isLiquidatable True if account can be liquidated
    /// @return totalValue Total value of the Credit Account in underlying
    function _isAccountLiquidatable(address creditAccount)
        internal
        view
        returns (bool isLiquidatable, uint256 totalValue)
    {
        IPriceOracleV2 priceOracle = IPriceOracleV2(
            creditManager.priceOracle()
        ); // F:[FA-14]

        (uint256 totalUSD, uint256 twvUSD) = _calcTotalValueUSD(
            priceOracle,
            creditAccount
        );

        // Computes total value in underlying
        totalValue = priceOracle.convertFromUSD(totalUSD, underlying); // F:[FA-14]

        (, , uint256 borrowAmountWithInterestAndFees) = creditManager
            .calcCreditAccountAccruedInterest(creditAccount); // F:[FA-14]

        // borrowAmountPlusInterestRateUSD x 10000 to be compared with USD values multiplied by LTs
        uint256 borrowAmountPlusInterestRateUSD = priceOracle.convertToUSD(
            borrowAmountWithInterestAndFees,
            underlying
        ) * PERCENTAGE_FACTOR;

        // Checks that current Hf < 1
        isLiquidatable = twvUSD < borrowAmountPlusInterestRateUSD;
    }

    /// @dev Returns whether the Credit Facade is expired
    function _isExpired() internal view returns (bool isExpired) {
        isExpired = (expirable) && (block.timestamp >= params.expirationDate); // F: [FA-46,47,48]
    }

    //
    // CONFIGURATION
    //

    /// @dev Sets the increaseDebtForbidden mode
    /// @notice increaseDebtForbidden can be used to secure pool funds
    /// without pausing the entire system. E.g., if a bug is reported
    /// that can potentially lead to loss of funds, but there is no
    /// immediate threat, new borrowing can be stopped, while other
    /// functionality (trading, closing/liquidating accounts) is retained
    function setIncreaseDebtForbidden(bool _mode)
        external
        creditConfiguratorOnly // F:[FA-44]
    {
        params.isIncreaseDebtForbidden = _mode;
    }

    /// @dev Sets borrowing limit per single block
    /// @notice Borrowing limit per block in conjunction with
    /// the monitoring system serves to minimize loss from hacks
    /// While an attacker would be able to steal, in worst case,
    /// up to (limitPerBlock * n blocks) of funds, the monitoring
    /// system would pause the contracts after detecting suspicious
    /// activity
    function setLimitPerBlock(uint128 newLimit)
        external
        creditConfiguratorOnly // F:[FA-44]
    {
        params.maxBorrowedAmountPerBlock = newLimit;
    }

    /// @dev Sets Credit Facade expiration date
    /// @notice See more at https://dev.gearbox.fi/docs/documentation/credit/liquidation#liquidating-accounts-by-expiration
    function setExpirationDate(uint40 newExpirationDate)
        external
        creditConfiguratorOnly
    {
        if (!expirable) {
            revert NotAllowedWhenNotExpirableException();
        }
        params.expirationDate = newExpirationDate;
    }

    /// @dev Sets borrowing limits per single Credit Account
    /// @param _minBorrowedAmount The minimal borrowed amount per Credit Account. Minimal amount can be relevant
    /// for liquidations, since very small amounts will make liquidations unprofitable for liquidators
    /// @param _maxBorrowedAmount The maximal borrowed amount per Credit Account. Used to limit exposure per a single
    /// credit account - especially relevant in whitelisted mode.
    function setCreditAccountLimits(
        uint128 _minBorrowedAmount,
        uint128 _maxBorrowedAmount
    ) external creditConfiguratorOnly {
        limits.minBorrowedAmount = _minBorrowedAmount; // F:
        limits.maxBorrowedAmount = _maxBorrowedAmount; // F:
    }

    //
    // CONTRACT WATCHLIST CONFIGURATION AND GETTERS
    //

    /// @dev Change upgradable contract state (add/remove depending on addOrRemove param).
    /// Direct approvals are forbidden for contracts marked as "upgradeable" for
    /// security reasions
    /// @param addr Address to add to / remove from the list
    /// @param addOrRemove True to be added, false to be removed
    /// @notice Upgradeable contracts are contracts with an upgradeable proxy
    /// Or other practices and patterns potentially detrimental to security
    /// Contracts from the list have certain restrictions applied to them
    function setUpgradeable(address addr, bool addOrRemove)
        external
        creditConfiguratorOnly
    {
        if (addOrRemove) {
            upgradeableContracts.add(addr); // F: [FA-50]
        } else {
            upgradeableContracts.remove(addr); // F: [FA-50]
        }
    }

    /// @dev Returns whether the address is in the list of upgradeable contracts
    /// @param addr Address to check
    function isUpgradeableContract(address addr) external view returns (bool) {
        return upgradeableContracts.contains(addr); // F: [FA-50]
    }

    /// @dev Returns the entire upgradeable contract list
    function upgradeableContractsList()
        external
        view
        returns (address[] memory)
    {
        return upgradeableContracts.values(); // F: [FA-50]
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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 ReentrancyGuard {
    // 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;

    constructor() {
        _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 making 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;
    }
}

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

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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

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
// OpenZeppelin Contracts v4.4.1 (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

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

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

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

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

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

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

struct MultiCall {
    address target;
    bytes callData;
}

library MultiCallOps {
    function copyMulticall(MultiCall memory call)
        internal
        pure
        returns (MultiCall memory)
    {
        return MultiCall({ target: call.target, callData: call.callData });
    }

    function trim(MultiCall[] memory calls)
        internal
        pure
        returns (MultiCall[] memory trimmed)
    {
        uint256 len = calls.length;

        if (len == 0) return calls;

        uint256 foundLen;
        while (calls[foundLen].target != address(0)) {
            unchecked {
                ++foundLen;
                if (foundLen == len) return calls;
            }
        }

        if (foundLen > 0) return copy(calls, foundLen);
    }

    function copy(MultiCall[] memory calls, uint256 len)
        internal
        pure
        returns (MultiCall[] memory res)
    {
        res = new MultiCall[](len);
        for (uint256 i; i < len; ) {
            res[i] = copyMulticall(calls[i]);
            unchecked {
                ++i;
            }
        }
    }

    function clone(MultiCall[] memory calls)
        internal
        pure
        returns (MultiCall[] memory res)
    {
        return copy(calls, calls.length);
    }

    function append(MultiCall[] memory calls, MultiCall memory newCall)
        internal
        pure
        returns (MultiCall[] memory res)
    {
        uint256 len = calls.length;
        res = new MultiCall[](len + 1);
        for (uint256 i; i < len; ) {
            res[i] = copyMulticall(calls[i]);
            unchecked {
                ++i;
            }
        }
        res[len] = copyMulticall(newCall);
    }

    function prepend(MultiCall[] memory calls, MultiCall memory newCall)
        internal
        pure
        returns (MultiCall[] memory res)
    {
        uint256 len = calls.length;
        res = new MultiCall[](len + 1);
        res[0] = copyMulticall(newCall);

        for (uint256 i = 1; i < len + 1; ) {
            res[i] = copyMulticall(calls[i]);
            unchecked {
                ++i;
            }
        }
    }

    function concat(MultiCall[] memory calls1, MultiCall[] memory calls2)
        internal
        pure
        returns (MultiCall[] memory res)
    {
        uint256 len1 = calls1.length;
        uint256 lenTotal = len1 + calls2.length;

        if (lenTotal == calls1.length) return clone(calls1);
        if (lenTotal == calls2.length) return clone(calls2);

        res = new MultiCall[](lenTotal);

        for (uint256 i; i < lenTotal; ) {
            res[i] = (i < len1)
                ? copyMulticall(calls1[i])
                : copyMulticall(calls2[i - len1]);
            unchecked {
                ++i;
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { Balance } from "../libraries/Balances.sol";
import { MultiCall } from "../libraries/MultiCall.sol";
import { ICreditManagerV2, ICreditManagerV2Exceptions } from "./ICreditManagerV2.sol";
import { IVersion } from "./IVersion.sol";

interface ICreditFacadeExtended {
    /// @dev Stores expected balances (computed as current balance + passed delta)
    ///      and compare with actual balances at the end of a multicall, reverts
    ///      if at least one is less than expected
    /// @param expected Array of expected balance changes
    /// @notice This is an extenstion function that does not exist in the Credit Facade
    ///         itself and can only be used within a multicall
    function revertIfReceivedLessThan(Balance[] memory expected) external;

    /// @dev Enables token in enabledTokenMask for the Credit Account of msg.sender
    /// @param token Address of token to enable
    function enableToken(address token) external;

    /// @dev Disables a token on the caller's Credit Account
    /// @param token Token to disable
    /// @notice This is an extenstion function that does not exist in the Credit Facade
    ///         itself and can only be used within a multicall
    function disableToken(address token) external;

    /// @dev Adds collateral to borrower's credit account
    /// @param onBehalfOf Address of the borrower whose account is funded
    /// @param token Address of a collateral token
    /// @param amount Amount to add
    function addCollateral(
        address onBehalfOf,
        address token,
        uint256 amount
    ) external payable;

    /// @dev Increases debt for msg.sender's Credit Account
    /// - Borrows the requested amount from the pool
    /// - Updates the CA's borrowAmount / cumulativeIndexOpen
    ///   to correctly compute interest going forward
    /// - Performs a full collateral check
    ///
    /// @param amount Amount to borrow
    function increaseDebt(uint256 amount) external;

    /// @dev Decrease debt
    /// - Decreases the debt by paying the requested amount + accrued interest + fees back to the pool
    /// - It's also include to this payment interest accrued at the moment and fees
    /// - Updates cunulativeIndex to cumulativeIndex now
    ///
    /// @param amount Amount to increase borrowed amount
    function decreaseDebt(uint256 amount) external;
}

interface ICreditFacadeEvents {
    /// @dev Emits when a new Credit Account is opened through the
    ///      Credit Facade
    event OpenCreditAccount(
        address indexed onBehalfOf,
        address indexed creditAccount,
        uint256 borrowAmount,
        uint16 referralCode
    );

    /// @dev Emits when the account owner closes their CA normally
    event CloseCreditAccount(address indexed borrower, address indexed to);

    /// @dev Emits when a Credit Account is liquidated due to low health factor
    event LiquidateCreditAccount(
        address indexed borrower,
        address indexed liquidator,
        address indexed to,
        uint256 remainingFunds
    );

    /// @dev Emits when a Credit Account is liquidated due to expiry
    event LiquidateExpiredCreditAccount(
        address indexed borrower,
        address indexed liquidator,
        address indexed to,
        uint256 remainingFunds
    );

    /// @dev Emits when the account owner increases CA's debt
    event IncreaseBorrowedAmount(address indexed borrower, uint256 amount);

    /// @dev Emits when the account owner reduces CA's debt
    event DecreaseBorrowedAmount(address indexed borrower, uint256 amount);

    /// @dev Emits when the account owner add new collateral to a CA
    event AddCollateral(
        address indexed onBehalfOf,
        address indexed token,
        uint256 value
    );

    /// @dev Emits when a multicall is started
    event MultiCallStarted(address indexed borrower);

    /// @dev Emits when a multicall is finished
    event MultiCallFinished();

    /// @dev Emits when Credit Account ownership is transferred
    event TransferAccount(address indexed oldOwner, address indexed newOwner);

    /// @dev Emits when the user changes approval for account transfers to itself from another address
    event TransferAccountAllowed(
        address indexed from,
        address indexed to,
        bool state
    );

    /// @dev Emits when the account owner enables a token on their CA
    event TokenEnabled(address indexed borrower, address indexed token);

    /// @dev Emits when the account owner disables a token on their CA
    event TokenDisabled(address indexed borrower, address indexed token);
}

interface ICreditFacadeExceptions is ICreditManagerV2Exceptions {
    /// @dev Thrown if the CreditFacade is not expirable, and an aciton is attempted that
    ///      requires expirability
    error NotAllowedWhenNotExpirableException();

    /// @dev Thrown if whitelisted mode is enabled, and an action is attempted that is
    ///      not allowed in whitelisted mode
    error NotAllowedInWhitelistedMode();

    /// @dev Thrown if a user attempts to transfer a CA to an address that didn't allow it
    error AccountTransferNotAllowedException();

    /// @dev Thrown if a liquidator tries to liquidate an account with a health factor above 1
    error CantLiquidateWithSuchHealthFactorException();

    /// @dev Thrown if a liquidator tries to liquidate an account by expiry while a Credit Facade is not expired
    error CantLiquidateNonExpiredException();

    /// @dev Thrown if call data passed to a multicall is too short
    error IncorrectCallDataException();

    /// @dev Thrown inside account closure multicall if the borrower attempts an action that is forbidden on closing
    ///      an account
    error ForbiddenDuringClosureException();

    /// @dev Thrown if debt increase and decrease are subsequently attempted in one multicall
    error IncreaseAndDecreaseForbiddenInOneCallException();

    /// @dev Thrown if a selector that doesn't match any allowed function is passed to the Credit Facade
    ///      during a multicall
    error UnknownMethodException();

    /// @dev Thrown if a user tries to open an account or increase debt with increaseDebtForbidden mode on
    error IncreaseDebtForbiddenException();

    /// @dev Thrown if the account owner tries to transfer an unhealthy account
    error CantTransferLiquidatableAccountException();

    /// @dev Thrown if too much new debt was taken within a single block
    error BorrowedBlockLimitException();

    /// @dev Thrown if the new debt principal for a CA falls outside of borrowing limits
    error BorrowAmountOutOfLimitsException();

    /// @dev Thrown if one of the balances on a Credit Account is less than expected
    ///      at the end of a multicall, if revertIfReceivedLessThan was called
    error BalanceLessThanMinimumDesiredException(address);

    /// @dev Thrown if a user attempts to open an account on a Credit Facade that has expired
    error OpenAccountNotAllowedAfterExpirationException();

    /// @dev Thrown if expected balances are attempted to be set through revertIfReceivedLessThan twice
    error ExpectedBalancesAlreadySetException();

    /// @dev Thrown if a Credit Account has enabled forbidden tokens and the owner attempts to perform an action
    ///      that is not allowed with any forbidden tokens enabled
    error ActionProhibitedWithForbiddenTokensException();
}

interface ICreditFacade is
    ICreditFacadeEvents,
    ICreditFacadeExceptions,
    IVersion
{
    //
    // CREDIT ACCOUNT MANAGEMENT
    //

    /// @dev Opens credit account, borrows funds from the pool and pulls collateral
    /// without any additional action.
    /// @param amount The amount of collateral provided by the borrower
    /// @param onBehalfOf The address to open an account for. Transfers to it have to be allowed if
    /// msg.sender != obBehalfOf
    /// @param leverageFactor Percentage of the user's own funds to borrow. 100 is equal to 100% - borrows the same amount
    /// as the user's own collateral, equivalent to 2x leverage.
    /// @param referralCode Referral code that is used for potential rewards. 0 if no referral code provided.
    function openCreditAccount(
        uint256 amount,
        address onBehalfOf,
        uint16 leverageFactor,
        uint16 referralCode
    ) external payable;

    /// @dev Opens a Credit Account and runs a batch of operations in a multicall
    /// @param borrowedAmount Debt size
    /// @param onBehalfOf The address to open an account for. Transfers to it have to be allowed if
    /// msg.sender != obBehalfOf
    /// @param calls The array of MultiCall structs encoding the required operations. Generally must have
    /// at least a call to addCollateral, as otherwise the health check at the end will fail.
    /// @param referralCode Referral code which is used for potential rewards. 0 if no referral code provided
    function openCreditAccountMulticall(
        uint256 borrowedAmount,
        address onBehalfOf,
        MultiCall[] calldata calls,
        uint16 referralCode
    ) external payable;

    /// @dev Runs a batch of transactions within a multicall and closes the account
    /// - Wraps ETH to WETH and sends it msg.sender if value > 0
    /// - Executes the multicall - the main purpose of a multicall when closing is to convert all assets to underlying
    /// in order to pay the debt.
    /// - Closes credit account:
    ///    + Checks the underlying balance: if it is greater than the amount paid to the pool, transfers the underlying
    ///      from the Credit Account and proceeds. If not, tries to transfer the shortfall from msg.sender.
    ///    + Transfers all enabled assets with non-zero balances to the "to" address, unless they are marked
    ///      to be skipped in skipTokenMask
    ///    + If convertWETH is true, converts WETH into ETH before sending to the recipient
    /// - Emits a CloseCreditAccount event
    ///
    /// @param to Address to send funds to during account closing
    /// @param skipTokenMask Uint-encoded bit mask where 1's mark tokens that shouldn't be transferred
    /// @param convertWETH If true, converts WETH into ETH before sending to "to"
    /// @param calls The array of MultiCall structs encoding the operations to execute before closing the account.
    function closeCreditAccount(
        address to,
        uint256 skipTokenMask,
        bool convertWETH,
        MultiCall[] calldata calls
    ) external payable;

    /// @dev Runs a batch of transactions within a multicall and liquidates the account
    /// - Computes the total value and checks that hf < 1. An account can't be liquidated when hf >= 1.
    ///   Total value has to be computed before the multicall, otherwise the liquidator would be able
    ///   to manipulate it.
    /// - Wraps ETH to WETH and sends it to msg.sender (liquidator) if value > 0
    /// - Executes the multicall - the main purpose of a multicall when liquidating is to convert all assets to underlying
    ///   in order to pay the debt.
    /// - Liquidate credit account:
    ///    + Computes the amount that needs to be paid to the pool. If totalValue * liquidationDiscount < borrow + interest + fees,
    ///      only totalValue * liquidationDiscount has to be paid. Since liquidationDiscount < 1, the liquidator can take
    ///      totalValue * (1 - liquidationDiscount) as premium. Also computes the remaining funds to be sent to borrower
    ///      as totalValue * liquidationDiscount - amountToPool.
    ///    + Checks the underlying balance: if it is greater than amountToPool + remainingFunds, transfers the underlying
    ///      from the Credit Account and proceeds. If not, tries to transfer the shortfall from the liquidator.
    ///    + Transfers all enabled assets with non-zero balances to the "to" address, unless they are marked
    ///      to be skipped in skipTokenMask. If the liquidator is confident that all assets were converted
    ///      during the multicall, they can set the mask to uint256.max - 1, to only transfer the underlying
    ///    + If convertWETH is true, converts WETH into ETH before sending
    /// - Emits LiquidateCreditAccount event
    ///
    /// @param to Address to send funds to after liquidation
    /// @param skipTokenMask Uint-encoded bit mask where 1's mark tokens that shouldn't be transferred
    /// @param convertWETH If true, converts WETH into ETH before sending to "to"
    /// @param calls The array of MultiCall structs encoding the operations to execute before liquidating the account.
    function liquidateCreditAccount(
        address borrower,
        address to,
        uint256 skipTokenMask,
        bool convertWETH,
        MultiCall[] calldata calls
    ) external payable;

    /// @dev Runs a batch of transactions within a multicall and liquidates the account when
    /// this Credit Facade is expired
    /// The general flow of liquidation is nearly the same as normal liquidations, with two main differences:
    ///     - An account can be liquidated on an expired Credit Facade even with hf > 1. However,
    ///       no accounts can be liquidated through this function if the Credit Facade is not expired.
    ///     - Liquidation premiums and fees for liquidating expired accounts are reduced.
    /// It is still possible to normally liquidate an underwater Credit Account, even when the Credit Facade
    /// is expired.
    /// @param to Address to send funds to after liquidation
    /// @param skipTokenMask Uint-encoded bit mask where 1's mark tokens that shouldn't be transferred
    /// @param convertWETH If true, converts WETH into ETH before sending to "to"
    /// @param calls The array of MultiCall structs encoding the operations to execute before liquidating the account.
    /// @notice See more at https://dev.gearbox.fi/docs/documentation/credit/liquidation#liquidating-accounts-by-expiration
    function liquidateExpiredCreditAccount(
        address borrower,
        address to,
        uint256 skipTokenMask,
        bool convertWETH,
        MultiCall[] calldata calls
    ) external payable;

    /// @dev Increases debt for msg.sender's Credit Account
    /// - Borrows the requested amount from the pool
    /// - Updates the CA's borrowAmount / cumulativeIndexOpen
    ///   to correctly compute interest going forward
    /// - Performs a full collateral check
    ///
    /// @param amount Amount to borrow
    function increaseDebt(uint256 amount) external;

    /// @dev Decrease debt
    /// - Decreases the debt by paying the requested amount + accrued interest + fees back to the pool
    /// - It's also include to this payment interest accrued at the moment and fees
    /// - Updates cunulativeIndex to cumulativeIndex now
    ///
    /// @param amount Amount to increase borrowed amount
    function decreaseDebt(uint256 amount) external;

    /// @dev Adds collateral to borrower's credit account
    /// @param onBehalfOf Address of the borrower whose account is funded
    /// @param token Address of a collateral token
    /// @param amount Amount to add
    function addCollateral(
        address onBehalfOf,
        address token,
        uint256 amount
    ) external payable;

    /// @dev Executes a batch of transactions within a Multicall, to manage an existing account
    ///  - Wraps ETH and sends it back to msg.sender, if value > 0
    ///  - Executes the Multicall
    ///  - Performs a fullCollateralCheck to verify that hf > 1 after all actions
    /// @param calls The array of MultiCall structs encoding the operations to execute.
    function multicall(MultiCall[] calldata calls) external payable;

    /// @dev Returns true if the borrower has an open Credit Account
    /// @param borrower Borrower address
    function hasOpenedCreditAccount(address borrower)
        external
        view
        returns (bool);

    /// @dev Sets token allowance from msg.sender's Credit Account to a connected target contract
    /// @param targetContract Contract to set allowance to. Cannot be in the list of upgradeable contracts
    /// @param token Token address
    /// @param amount Allowance amount
    function approve(
        address targetContract,
        address token,
        uint256 amount
    ) external;

    /// @dev Approves account transfer from another user to msg.sender
    /// @param from Address for which account transfers are allowed/forbidden
    /// @param state True is transfer is allowed, false if forbidden
    function approveAccountTransfer(address from, bool state) external;

    /// @dev Enables token in enabledTokenMask for the Credit Account of msg.sender
    /// @param token Address of token to enable
    function enableToken(address token) external;

    /// @dev Transfers credit account to another user
    /// By default, this action is forbidden, and the user has to approve transfers from sender to itself
    /// by calling approveAccountTransfer.
    /// This is done to prevent malicious actors from transferring compromised accounts to other users.
    /// @param to Address to transfer the account to
    function transferAccountOwnership(address to) external;

    //
    // GETTERS
    //

    /// @dev Calculates total value for provided Credit Account in underlying
    ///
    /// @param creditAccount Credit Account address
    /// @return total Total value in underlying
    /// @return twv Total weighted (discounted by liquidation thresholds) value in underlying
    function calcTotalValue(address creditAccount)
        external
        view
        returns (uint256 total, uint256 twv);

    /**
     * @dev Calculates health factor for the credit account
     *
     *          sum(asset[i] * liquidation threshold[i])
     *   Hf = --------------------------------------------
     *         borrowed amount + interest accrued + fees
     *
     *
     * More info: https://dev.gearbox.fi/developers/credit/economy#health-factor
     *
     * @param creditAccount Credit account address
     * @return hf = Health factor in bp (see PERCENTAGE FACTOR in PercentageMath.sol)
     */
    function calcCreditAccountHealthFactor(address creditAccount)
        external
        view
        returns (uint256 hf);

    /// @dev Returns true if token is a collateral token and is not forbidden,
    /// otherwise returns false
    /// @param token Token to check
    function isTokenAllowed(address token) external view returns (bool);

    /// @dev Returns the CreditManager connected to this Credit Facade
    function creditManager() external view returns (ICreditManagerV2);

    /// @dev Returns true if 'from' is allowed to transfer Credit Accounts to 'to'
    /// @param from Sender address to check allowance for
    /// @param to Receiver address to check allowance for
    function transfersAllowed(address from, address to)
        external
        view
        returns (bool);

    /// @return maxBorrowedAmountPerBlock Maximal amount of new debt that can be taken per block
    /// @return isIncreaseDebtForbidden True if increasing debt is forbidden
    /// @return expirationDate Timestamp of the next expiration (for expirable Credit Facades only)
    function params()
        external
        view
        returns (
            uint128 maxBorrowedAmountPerBlock,
            bool isIncreaseDebtForbidden,
            uint40 expirationDate
        );

    /// @return minBorrowedAmount Minimal borrowed amount per credit account
    /// @return maxBorrowedAmount Maximal borrowed amount per credit account
    function limits()
        external
        view
        returns (uint128 minBorrowedAmount, uint128 maxBorrowedAmount);

    /// @dev Address of the DegenNFT that gatekeeps account openings in whitelisted mode
    function degenNFT() external view returns (address);

    /// @dev Address of the underlying asset
    function underlying() external view returns (address);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

struct Balance {
    address token;
    uint256 balance;
}

library BalanceOps {
    error UnknownToken(address);

    function copyBalance(Balance memory b)
        internal
        pure
        returns (Balance memory)
    {
        return Balance({ token: b.token, balance: b.balance });
    }

    function addBalance(
        Balance[] memory b,
        address token,
        uint256 amount
    ) internal pure {
        b[getIndex(b, token)].balance += amount;
    }

    function subBalance(
        Balance[] memory b,
        address token,
        uint256 amount
    ) internal pure {
        b[getIndex(b, token)].balance -= amount;
    }

    function getBalance(Balance[] memory b, address token)
        internal
        pure
        returns (uint256 amount)
    {
        return b[getIndex(b, token)].balance;
    }

    function setBalance(
        Balance[] memory b,
        address token,
        uint256 amount
    ) internal pure {
        b[getIndex(b, token)].balance = amount;
    }

    function getIndex(Balance[] memory b, address token)
        internal
        pure
        returns (uint256 index)
    {
        for (uint256 i; i < b.length; ) {
            if (b[i].token == token) {
                return i;
            }

            unchecked {
                ++i;
            }
        }
        revert UnknownToken(token);
    }

    function copy(Balance[] memory b, uint256 len)
        internal
        pure
        returns (Balance[] memory res)
    {
        res = new Balance[](len);
        for (uint256 i; i < len; ) {
            res[i] = copyBalance(b[i]);
            unchecked {
                ++i;
            }
        }
    }

    function clone(Balance[] memory b)
        internal
        pure
        returns (Balance[] memory)
    {
        return copy(b, b.length);
    }

    function getModifiedAfterSwap(
        Balance[] memory b,
        address tokenFrom,
        uint256 amountFrom,
        address tokenTo,
        uint256 amountTo
    ) internal pure returns (Balance[] memory res) {
        res = copy(b, b.length);
        setBalance(res, tokenFrom, getBalance(b, tokenFrom) - amountFrom);
        setBalance(res, tokenTo, getBalance(b, tokenTo) + amountTo);
    }
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IPriceOracleV2 } from "./IPriceOracle.sol";
import { IVersion } from "./IVersion.sol";

enum ClosureAction {
    CLOSE_ACCOUNT,
    LIQUIDATE_ACCOUNT,
    LIQUIDATE_EXPIRED_ACCOUNT,
    LIQUIDATE_PAUSED
}

interface ICreditManagerV2Events {
    /// @dev Emits when a call to an external contract is made through the Credit Manager
    event ExecuteOrder(address indexed borrower, address indexed target);

    /// @dev Emits when a configurator is upgraded
    event NewConfigurator(address indexed newConfigurator);
}

interface ICreditManagerV2Exceptions {
    /// @dev Thrown if an access-restricted function is called by an address that is not
    ///      the connected Credit Facade, or an allowed adapter
    error AdaptersOrCreditFacadeOnlyException();

    /// @dev Thrown if an access-restricted function is called by an address that is not
    ///      the connected Credit Facade
    error CreditFacadeOnlyException();

    /// @dev Thrown if an access-restricted function is called by an address that is not
    ///      the connected Credit Configurator
    error CreditConfiguratorOnlyException();

    /// @dev Thrown on attempting to open a Credit Account for or transfer a Credit Account
    ///      to the zero address or an address that already owns a Credit Account
    error ZeroAddressOrUserAlreadyHasAccountException();

    /// @dev Thrown on attempting to execute an order to an address that is not an allowed
    ///      target contract
    error TargetContractNotAllowedException();

    /// @dev Thrown on failing a full collateral check after an operation
    error NotEnoughCollateralException();

    /// @dev Thrown on attempting to receive a token that is not a collateral token
    ///      or was forbidden
    error TokenNotAllowedException();

    /// @dev Thrown if an attempt to approve a collateral token to a target contract failed
    error AllowanceFailedException();

    /// @dev Thrown on attempting to perform an action for an address that owns no Credit Account
    error HasNoOpenedAccountException();

    /// @dev Thrown on attempting to add a token that is already in a collateral list
    error TokenAlreadyAddedException();

    /// @dev Thrown on configurator attempting to add more than 256 collateral tokens
    error TooManyTokensException();

    /// @dev Thrown if more than the maximal number of tokens were enabled on a Credit Account,
    ///      and there are not enough unused token to disable
    error TooManyEnabledTokensException();

    /// @dev Thrown when a reentrancy into the contract is attempted
    error ReentrancyLockException();
}

/// @notice All Credit Manager functions are access-restricted and can only be called
///         by the Credit Facade or allowed adapters. Users are not allowed to
///         interact with the Credit Manager directly
interface ICreditManagerV2 is
    ICreditManagerV2Events,
    ICreditManagerV2Exceptions,
    IVersion
{
    //
    // CREDIT ACCOUNT MANAGEMENT
    //

    ///  @dev Opens credit account and borrows funds from the pool.
    /// - Takes Credit Account from the factory;
    /// - Requests the pool to lend underlying to the Credit Account
    ///
    /// @param borrowedAmount Amount to be borrowed by the Credit Account
    /// @param onBehalfOf The owner of the newly opened Credit Account
    function openCreditAccount(uint256 borrowedAmount, address onBehalfOf)
        external
        returns (address);

    ///  @dev Closes a Credit Account - covers both normal closure and liquidation
    /// - Checks whether the contract is paused, and, if so, if the payer is an emergency liquidator.
    ///   Only emergency liquidators are able to liquidate account while the CM is paused.
    ///   Emergency liquidations do not pay a liquidator premium or liquidation fees.
    /// - Calculates payments to various recipients on closure:
    ///    + Computes amountToPool, which is the amount to be sent back to the pool.
    ///      This includes the principal, interest and fees, but can't be more than
    ///      total position value
    ///    + Computes remainingFunds during liquidations - these are leftover funds
    ///      after paying the pool and the liquidator, and are sent to the borrower
    ///    + Computes protocol profit, which includes interest and liquidation fees
    ///    + Computes loss if the totalValue is less than borrow amount + interest
    /// - Checks the underlying token balance:
    ///    + if it is larger than amountToPool, then the pool is paid fully from funds on the Credit Account
    ///    + else tries to transfer the shortfall from the payer - either the borrower during closure, or liquidator during liquidation
    /// - Send assets to the "to" address, as long as they are not included into skipTokenMask
    /// - If convertWETH is true, the function converts WETH into ETH before sending
    /// - Returns the Credit Account back to factory
    ///
    /// @param borrower Borrower address
    /// @param closureActionType Whether the account is closed, liquidated or liquidated due to expiry
    /// @param totalValue Portfolio value for liqution, 0 for ordinary closure
    /// @param payer Address which would be charged if credit account has not enough funds to cover amountToPool
    /// @param to Address to which the leftover funds will be sent
    /// @param skipTokenMask Tokenmask contains 1 for tokens which needed to be skipped for sending
    /// @param convertWETH If true converts WETH to ETH
    function closeCreditAccount(
        address borrower,
        ClosureAction closureActionType,
        uint256 totalValue,
        address payer,
        address to,
        uint256 skipTokenMask,
        bool convertWETH
    ) external returns (uint256 remainingFunds);

    /// @dev Manages debt size for borrower:
    ///
    /// - Increase debt:
    ///   + Increases debt by transferring funds from the pool to the credit account
    ///   + Updates the cumulative index to keep interest the same. Since interest
    ///     is always computed dynamically as borrowedAmount * (cumulativeIndexNew / cumulativeIndexOpen - 1),
    ///     cumulativeIndexOpen needs to be updated, as the borrow amount has changed
    ///
    /// - Decrease debt:
    ///   + Repays debt partially + all interest and fees accrued thus far
    ///   + Updates cunulativeIndex to cumulativeIndex now
    ///
    /// @param creditAccount Address of the Credit Account to change debt for
    /// @param amount Amount to increase / decrease the principal by
    /// @param increase True to increase principal, false to decrease
    /// @return newBorrowedAmount The new debt principal
    function manageDebt(
        address creditAccount,
        uint256 amount,
        bool increase
    ) external returns (uint256 newBorrowedAmount);

    /// @dev Adds collateral to borrower's credit account
    /// @param payer Address of the account which will be charged to provide additional collateral
    /// @param creditAccount Address of the Credit Account
    /// @param token Collateral token to add
    /// @param amount Amount to add
    function addCollateral(
        address payer,
        address creditAccount,
        address token,
        uint256 amount
    ) external;

    /// @dev Transfers Credit Account ownership to another address
    /// @param from Address of previous owner
    /// @param to Address of new owner
    function transferAccountOwnership(address from, address to) external;

    /// @dev Requests the Credit Account to approve a collateral token to another contract.
    /// @param borrower Borrower's address
    /// @param targetContract Spender to change allowance for
    /// @param token Collateral token to approve
    /// @param amount New allowance amount
    function approveCreditAccount(
        address borrower,
        address targetContract,
        address token,
        uint256 amount
    ) external;

    /// @dev Requests a Credit Account to make a low-level call with provided data
    /// This is the intended pathway for state-changing interactions with 3rd-party protocols
    /// @param borrower Borrower's address
    /// @param targetContract Contract to be called
    /// @param data Data to pass with the call
    function executeOrder(
        address borrower,
        address targetContract,
        bytes memory data
    ) external returns (bytes memory);

    //
    // COLLATERAL VALIDITY AND ACCOUNT HEALTH CHECKS
    //

    /// @dev Enables a token on a Credit Account, including it
    /// into account health and total value calculations
    /// @param creditAccount Address of a Credit Account to enable the token for
    /// @param token Address of the token to be enabled
    function checkAndEnableToken(address creditAccount, address token) external;

    /// @dev Optimized health check for individual swap-like operations.
    /// @notice Fast health check assumes that only two tokens (input and output)
    ///         participate in the operation and computes a % change in weighted value between
    ///         inbound and outbound collateral. The cumulative negative change across several
    ///         swaps in sequence cannot be larger than feeLiquidation (a fee that the
    ///         protocol is ready to waive if needed). Since this records a % change
    ///         between just two tokens, the corresponding % change in TWV will always be smaller,
    ///         which makes this check safe.
    ///         More details at https://dev.gearbox.fi/docs/documentation/risk/fast-collateral-check#fast-check-protection
    /// @param creditAccount Address of the Credit Account
    /// @param tokenIn Address of the token spent by the swap
    /// @param tokenOut Address of the token received from the swap
    /// @param balanceInBefore Balance of tokenIn before the operation
    /// @param balanceOutBefore Balance of tokenOut before the operation
    function fastCollateralCheck(
        address creditAccount,
        address tokenIn,
        address tokenOut,
        uint256 balanceInBefore,
        uint256 balanceOutBefore
    ) external;

    /// @dev Performs a full health check on an account, summing up
    /// value of all enabled collateral tokens
    /// @param creditAccount Address of the Credit Account to check
    function fullCollateralCheck(address creditAccount) external;

    /// @dev Checks that the number of enabled tokens on a Credit Account
    ///      does not violate the maximal enabled token limit and tries
    ///      to disable unused tokens if it does
    /// @param creditAccount Account to check enabled tokens for
    function checkAndOptimizeEnabledTokens(address creditAccount) external;

    /// @dev Disables a token on a credit account
    /// @notice Usually called by adapters to disable spent tokens during a multicall,
    ///         but can also be called separately from the Credit Facade to remove
    ///         unwanted tokens
    /// @return True if token mask was change otherwise False
    function disableToken(address creditAccount, address token)
        external
        returns (bool);

    //
    // GETTERS
    //

    /// @dev Returns the address of a borrower's Credit Account, or reverts if there is none.
    /// @param borrower Borrower's address
    function getCreditAccountOrRevert(address borrower)
        external
        view
        returns (address);

    /// @dev Computes amounts that must be sent to various addresses before closing an account
    /// @param totalValue Credit Accounts total value in underlying
    /// @param closureActionType Type of account closure
    ///        * CLOSE_ACCOUNT: The account is healthy and is closed normally
    ///        * LIQUIDATE_ACCOUNT: The account is unhealthy and is being liquidated to avoid bad debt
    ///        * LIQUIDATE_EXPIRED_ACCOUNT: The account has expired and is being liquidated (lowered liquidation premium)
    ///        * LIQUIDATE_PAUSED: The account is liquidated while the system is paused due to emergency (no liquidation premium)
    /// @param borrowedAmount Credit Account's debt principal
    /// @param borrowedAmountWithInterest Credit Account's debt principal + interest
    /// @return amountToPool Amount of underlying to be sent to the pool
    /// @return remainingFunds Amount of underlying to be sent to the borrower (only applicable to liquidations)
    /// @return profit Protocol's profit from fees (if any)
    /// @return loss Protocol's loss from bad debt (if any)
    function calcClosePayments(
        uint256 totalValue,
        ClosureAction closureActionType,
        uint256 borrowedAmount,
        uint256 borrowedAmountWithInterest
    )
        external
        view
        returns (
            uint256 amountToPool,
            uint256 remainingFunds,
            uint256 profit,
            uint256 loss
        );

    /// @dev Calculates the debt accrued by a Credit Account
    /// @param creditAccount Address of the Credit Account
    /// @return borrowedAmount The debt principal
    /// @return borrowedAmountWithInterest The debt principal + accrued interest
    /// @return borrowedAmountWithInterestAndFees The debt principal + accrued interest and protocol fees
    function calcCreditAccountAccruedInterest(address creditAccount)
        external
        view
        returns (
            uint256 borrowedAmount,
            uint256 borrowedAmountWithInterest,
            uint256 borrowedAmountWithInterestAndFees
        );

    /// @dev Maps Credit Accounts to bit masks encoding their enabled token sets
    /// Only enabled tokens are counted as collateral for the Credit Account
    /// @notice An enabled token mask encodes an enabled token by setting
    ///         the bit at the position equal to token's index to 1
    function enabledTokensMap(address creditAccount)
        external
        view
        returns (uint256);

    /// @dev Maps the Credit Account to its current percentage drop across all swaps since
    ///      the last full check, in RAY format
    function cumulativeDropAtFastCheckRAY(address creditAccount)
        external
        view
        returns (uint256);

    /// @dev Returns the collateral token at requested index and its liquidation threshold
    /// @param id The index of token to return
    function collateralTokens(uint256 id)
        external
        view
        returns (address token, uint16 liquidationThreshold);

    /// @dev Returns the collateral token with requested mask and its liquidationThreshold
    /// @param tokenMask Token mask corresponding to the token
    function collateralTokensByMask(uint256 tokenMask)
        external
        view
        returns (address token, uint16 liquidationThreshold);

    /// @dev Total number of known collateral tokens.
    function collateralTokensCount() external view returns (uint256);

    /// @dev Returns the mask for the provided token
    /// @param token Token to returns the mask for
    function tokenMasksMap(address token) external view returns (uint256);

    /// @dev Bit mask encoding a set of forbidden tokens
    function forbiddenTokenMask() external view returns (uint256);

    /// @dev Maps allowed adapters to their respective target contracts.
    function adapterToContract(address adapter) external view returns (address);

    /// @dev Maps 3rd party contracts to their respective adapters
    function contractToAdapter(address targetContract)
        external
        view
        returns (address);

    /// @dev Address of the underlying asset
    function underlying() external view returns (address);

    /// @dev Address of the connected pool
    function pool() external view returns (address);

    /// @dev Address of the connected pool
    /// @notice [DEPRECATED]: use pool() instead.
    function poolService() external view returns (address);

    /// @dev A map from borrower addresses to Credit Account addresses
    function creditAccounts(address borrower) external view returns (address);

    /// @dev Address of the connected Credit Configurator
    function creditConfigurator() external view returns (address);

    /// @dev Address of WETH
    function wethAddress() external view returns (address);

    /// @dev Returns the liquidation threshold for the provided token
    /// @param token Token to retrieve the LT for
    function liquidationThresholds(address token)
        external
        view
        returns (uint16);

    /// @dev The maximal number of enabled tokens on a single Credit Account
    function maxAllowedEnabledTokenLength() external view returns (uint8);

    /// @dev Maps addresses to their status as emergency liquidator.
    /// @notice Emergency liquidators are trusted addresses
    /// that are able to liquidate positions while the contracts are paused,
    /// e.g. when there is a risk of bad debt while an exploit is being patched.
    /// In the interest of fairness, emergency liquidators do not receive a premium
    /// And are compensated by the Gearbox DAO separately.
    function canLiquidateWhilePaused(address) external view returns (bool);

    /// @dev Returns the fee parameters of the Credit Manager
    /// @return feeInterest Percentage of interest taken by the protocol as profit
    /// @return feeLiquidation Percentage of account value taken by the protocol as profit
    ///         during unhealthy account liquidations
    /// @return liquidationDiscount Multiplier that reduces the effective totalValue during unhealthy account liquidations,
    ///         allowing the liquidator to take the unaccounted for remainder as premium. Equal to (1 - liquidationPremium)
    /// @return feeLiquidationExpired Percentage of account value taken by the protocol as profit
    ///         during expired account liquidations
    /// @return liquidationDiscountExpired Multiplier that reduces the effective totalValue during expired account liquidations,
    ///         allowing the liquidator to take the unaccounted for remainder as premium. Equal to (1 - liquidationPremiumExpired)
    function fees()
        external
        view
        returns (
            uint16 feeInterest,
            uint16 feeLiquidation,
            uint16 liquidationDiscount,
            uint16 feeLiquidationExpired,
            uint16 liquidationDiscountExpired
        );

    /// @dev Address of the connected Credit Facade
    function creditFacade() external view returns (address);

    /// @dev Address of the connected Price Oracle
    function priceOracle() external view returns (IPriceOracleV2);

    /// @dev Address of the universal adapter
    function universalAdapter() external view returns (address);

    /// @dev Contract's version
    function version() external view returns (uint256);

    /// @dev Paused() state
    function checkEmergencyPausable(address caller, bool state)
        external
        returns (bool);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

// Denominations

uint256 constant WAD = 1e18;
uint256 constant RAY = 1e27;

// 25% of type(uint256).max
uint256 constant ALLOWANCE_THRESHOLD = type(uint96).max >> 3;

// FEE = 50%
uint16 constant DEFAULT_FEE_INTEREST = 50_00; // 50%

// LIQUIDATION_FEE 1.5%
uint16 constant DEFAULT_FEE_LIQUIDATION = 1_50; // 1.5%

// LIQUIDATION PREMIUM 4%
uint16 constant DEFAULT_LIQUIDATION_PREMIUM = 4_00; // 4%

// LIQUIDATION_FEE_EXPIRED 2%
uint16 constant DEFAULT_FEE_LIQUIDATION_EXPIRED = 1_00; // 2%

// LIQUIDATION PREMIUM EXPIRED 2%
uint16 constant DEFAULT_LIQUIDATION_PREMIUM_EXPIRED = 2_00; // 2%

// DEFAULT PROPORTION OF MAX BORROWED PER BLOCK TO MAX BORROWED PER ACCOUNT
uint16 constant DEFAULT_LIMIT_PER_BLOCK_MULTIPLIER = 2;

// Seconds in a year
uint256 constant SECONDS_PER_YEAR = 365 days;
uint256 constant SECONDS_PER_ONE_AND_HALF_YEAR = (SECONDS_PER_YEAR * 3) / 2;

// OPERATIONS

// Leverage decimals - 100 is equal to 2x leverage (100% * collateral amount + 100% * borrowed amount)
uint8 constant LEVERAGE_DECIMALS = 100;

// Maximum withdraw fee for pool in PERCENTAGE_FACTOR format
uint8 constant MAX_WITHDRAW_FEE = 100;

uint256 constant EXACT_INPUT = 1;
uint256 constant EXACT_OUTPUT = 2;

address constant UNIVERSAL_CONTRACT = 0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC;

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import { IVersion } from "./IVersion.sol";
import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";

interface IDegenNFTExceptions {
    /// @dev Thrown if an access-restricted function was called by non-CreditFacade
    error CreditFacadeOrConfiguratorOnlyException();

    /// @dev Thrown if an access-restricted function was called by non-minter
    error MinterOnlyException();

    /// @dev Thrown if trying to add a burner address that is not a correct Credit Facade
    error InvalidCreditFacadeException();

    /// @dev Thrown if the account's balance is not sufficient for an action (usually a burn)
    error InsufficientBalanceException();
}

interface IDegenNFTEvents {
    /// @dev Minted when new minter set
    event NewMinterSet(address indexed);

    /// @dev Minted each time when new credit facade added
    event NewCreditFacadeAdded(address indexed);

    /// @dev Minted each time when new credit facade added
    event NewCreditFacadeRemoved(address indexed);
}

interface IDegenNFT is
    IDegenNFTExceptions,
    IDegenNFTEvents,
    IVersion,
    IERC721Metadata
{
    /// @dev address of the current minter
    function minter() external view returns (address);

    /// @dev Stores the total number of tokens on holder accounts
    function totalSupply() external view returns (uint256);

    /// @dev Stores the base URI for NFT metadata
    function baseURI() external view returns (string memory);

    /// @dev Mints a specified amount of tokens to the address
    /// @param to Address the tokens are minted to
    /// @param amount The number of tokens to mint
    function mint(address to, uint256 amount) external;

    /// @dev Burns a number of tokens from a specified address
    /// @param from The address a token will be burnt from
    /// @param amount The number of tokens to burn
    function burn(address from, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import { IVersion } from "./IVersion.sol";

interface IPriceOracleV2Events {
    /// @dev Emits when a new price feed is added
    event NewPriceFeed(address indexed token, address indexed priceFeed);
}

interface IPriceOracleV2Exceptions {
    /// @dev Thrown if a price feed returns 0
    error ZeroPriceException();

    /// @dev Thrown if the last recorded result was not updated in the last round
    error ChainPriceStaleException();

    /// @dev Thrown on attempting to get a result for a token that does not have a price feed
    error PriceOracleNotExistsException();
}

/// @title Price oracle interface
interface IPriceOracleV2 is
    IPriceOracleV2Events,
    IPriceOracleV2Exceptions,
    IVersion
{
    /// @dev Converts a quantity of an asset to USD (decimals = 8).
    /// @param amount Amount to convert
    /// @param token Address of the token to be converted
    function convertToUSD(uint256 amount, address token)
        external
        view
        returns (uint256);

    /// @dev Converts a quantity of USD (decimals = 8) to an equivalent amount of an asset
    /// @param amount Amount to convert
    /// @param token Address of the token converted to
    function convertFromUSD(uint256 amount, address token)
        external
        view
        returns (uint256);

    /// @dev Converts one asset into another
    ///
    /// @param amount Amount to convert
    /// @param tokenFrom Address of the token to convert from
    /// @param tokenTo Address of the token to convert to
    function convert(
        uint256 amount,
        address tokenFrom,
        address tokenTo
    ) external view returns (uint256);

    /// @dev Returns collateral values for two tokens, required for a fast check
    /// @param amountFrom Amount of the outbound token
    /// @param tokenFrom Address of the outbound token
    /// @param amountTo Amount of the inbound token
    /// @param tokenTo Address of the inbound token
    /// @return collateralFrom Value of the outbound token amount in USD
    /// @return collateralTo Value of the inbound token amount in USD
    function fastCheck(
        uint256 amountFrom,
        address tokenFrom,
        uint256 amountTo,
        address tokenTo
    ) external view returns (uint256 collateralFrom, uint256 collateralTo);

    /// @dev Returns token's price in USD (8 decimals)
    /// @param token The token to compute the price for
    function getPrice(address token) external view returns (uint256);

    /// @dev Returns the price feed address for the passed token
    /// @param token Token to get the price feed for
    function priceFeeds(address token)
        external
        view
        returns (address priceFeed);

    /// @dev Returns the price feed for the passed token,
    ///      with additional parameters
    /// @param token Token to get the price feed for
    function priceFeedsWithFlags(address token)
        external
        view
        returns (
            address priceFeed,
            bool skipCheck,
            uint256 decimals
        );
}

interface IPriceOracleV2Ext is IPriceOracleV2 {
    /// @dev Sets a price feed if it doesn't exist, or updates an existing one
    /// @param token Address of the token to set the price feed for
    /// @param priceFeed Address of a USD price feed adhering to Chainlink's interface
    function addPriceFeed(address token, address priceFeed) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.10;

import { Errors } from "./Errors.sol";

uint16 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;

/**
 * @title PercentageMath library
 * @author Aave
 * @notice Provides functions to perform percentage calculations
 * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
 * @dev Operations are rounded half up
 **/

library PercentageMath {
    /**
     * @dev Executes a percentage multiplication
     * @param value The value of which the percentage needs to be calculated
     * @param percentage The percentage of the value to be calculated
     * @return The percentage of value
     **/
    function percentMul(uint256 value, uint256 percentage)
        internal
        pure
        returns (uint256)
    {
        if (value == 0 || percentage == 0) {
            return 0; // T:[PM-1]
        }

        //        require(
        //            value <= (type(uint256).max - HALF_PERCENT) / percentage,
        //            Errors.MATH_MULTIPLICATION_OVERFLOW
        //        ); // T:[PM-1]

        return (value * percentage + HALF_PERCENT) / PERCENTAGE_FACTOR; // T:[PM-1]
    }

    /**
     * @dev Executes a percentage division
     * @param value The value of which the percentage needs to be calculated
     * @param percentage The percentage of the value to be calculated
     * @return The value divided the percentage
     **/
    function percentDiv(uint256 value, uint256 percentage)
        internal
        pure
        returns (uint256)
    {
        require(percentage != 0, Errors.MATH_DIVISION_BY_ZERO); // T:[PM-2]
        uint256 halfPercentage = percentage / 2; // T:[PM-2]

        //        require(
        //            value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR,
        //            Errors.MATH_MULTIPLICATION_OVERFLOW
        //        ); // T:[PM-2]

        return (value * PERCENTAGE_FACTOR + halfPercentage) / percentage;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.4;

interface IWETH {
    /// @dev Deposits native ETH into the contract and mints WETH
    function deposit() external payable;

    /// @dev Transfers WETH to another account
    function transfer(address to, uint256 value) external returns (bool);

    /// @dev Burns WETH from msg.sender and send back native ETH
    function withdraw(uint256) external;
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

/// @dev Common contract exceptions

/// @dev Thrown on attempting to set an important address to zero address
error ZeroAddressException();

/// @dev Thrown on attempting to call a non-implemented function
error NotImplementedException();

/// @dev Thrown on attempting to set an EOA as an important contract in the system
error AddressIsNotContractException(address);

/// @dev Thrown on attempting to use a non-ERC20 contract or an EOA as a token
error IncorrectTokenContractException();

/// @dev Thrown on attempting to set a token price feed to an address that is not a
///      correct price feed
error IncorrectPriceFeedException();

/// @dev Thrown on attempting to call an access restricted function as a non-Configurator
error CallerNotConfiguratorException();

/// @dev Thrown on attempting to pause a contract as a non-Pausable admin
error CallerNotPausableAdminException();

/// @dev Thrown on attempting to pause a contract as a non-Unpausable admin
error CallerNotUnPausableAdminException();

error TokenIsNotAddedToCreditManagerException(address token);

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

/// @title IVersion
/// @dev Declares a version function which returns the contract's version
interface IVersion {
    /// @dev Returns contract version
    function version() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

/// @title Errors library
library Errors {
    //
    // COMMON
    //
    string public constant ZERO_ADDRESS_IS_NOT_ALLOWED = "Z0";
    string public constant NOT_IMPLEMENTED = "NI";
    string public constant INCORRECT_PATH_LENGTH = "PL";
    string public constant INCORRECT_ARRAY_LENGTH = "CR";
    string public constant REGISTERED_CREDIT_ACCOUNT_MANAGERS_ONLY = "CP";
    string public constant REGISTERED_POOLS_ONLY = "RP";
    string public constant INCORRECT_PARAMETER = "IP";

    //
    // MATH
    //
    string public constant MATH_MULTIPLICATION_OVERFLOW = "M1";
    string public constant MATH_ADDITION_OVERFLOW = "M2";
    string public constant MATH_DIVISION_BY_ZERO = "M3";

    //
    // POOL
    //
    string public constant POOL_CONNECTED_CREDIT_MANAGERS_ONLY = "PS0";
    string public constant POOL_INCOMPATIBLE_CREDIT_ACCOUNT_MANAGER = "PS1";
    string public constant POOL_MORE_THAN_EXPECTED_LIQUIDITY_LIMIT = "PS2";
    string public constant POOL_INCORRECT_WITHDRAW_FEE = "PS3";
    string public constant POOL_CANT_ADD_CREDIT_MANAGER_TWICE = "PS4";

    //
    // ACCOUNT FACTORY
    //
    string public constant AF_CANT_CLOSE_CREDIT_ACCOUNT_IN_THE_SAME_BLOCK =
        "AF1";
    string public constant AF_MINING_IS_FINISHED = "AF2";
    string public constant AF_CREDIT_ACCOUNT_NOT_IN_STOCK = "AF3";
    string public constant AF_EXTERNAL_ACCOUNTS_ARE_FORBIDDEN = "AF4";

    //
    // ADDRESS PROVIDER
    //
    string public constant AS_ADDRESS_NOT_FOUND = "AP1";

    //
    // CONTRACTS REGISTER
    //
    string public constant CR_POOL_ALREADY_ADDED = "CR1";
    string public constant CR_CREDIT_MANAGER_ALREADY_ADDED = "CR2";

    //
    // CREDIT ACCOUNT
    //
    string public constant CA_CONNECTED_CREDIT_MANAGER_ONLY = "CA1";
    string public constant CA_FACTORY_ONLY = "CA2";

    //
    // ACL
    //
    string public constant ACL_CALLER_NOT_PAUSABLE_ADMIN = "ACL1";
    string public constant ACL_CALLER_NOT_CONFIGURATOR = "ACL2";

    //
    // WETH GATEWAY
    //
    string public constant WG_DESTINATION_IS_NOT_WETH_COMPATIBLE = "WG1";
    string public constant WG_RECEIVE_IS_NOT_ALLOWED = "WG2";
    string public constant WG_NOT_ENOUGH_FUNDS = "WG3";

    //
    // TOKEN DISTRIBUTOR
    //
    string public constant TD_WALLET_IS_ALREADY_CONNECTED_TO_VC = "TD1";
    string public constant TD_INCORRECT_WEIGHTS = "TD2";
    string public constant TD_NON_ZERO_BALANCE_AFTER_DISTRIBUTION = "TD3";
    string public constant TD_CONTRIBUTOR_IS_NOT_REGISTERED = "TD4";
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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"internalType":"address","name":"token","type":"address"}],"name":"TokenDisabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"TokenEnabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"TransferAccount","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"bool","name":"state","type":"bool"}],"name":"TransferAccountAllowed","type":"event"},{"inputs":[{"internalType":"address","name":"onBehalfOf","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"addCollateral","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"targetContract","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"bool","name":"state","type":"bool"}],"name":"approveAccountTransfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"creditAccount","type":"address"}],"name":"calcCreditAccountHealthFactor","outputs":[{"internalType":"uint256","name":"hf","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"creditAccount","type":"address"}],"name":"calcTotalValue","outputs":[{"internalType":"uint256","name":"total","type":"uint256"},{"internalType":"uint256","name":"twv","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"skipTokenMask","type":"uint256"},{"internalType":"bool","name":"convertWETH","type":"bool"},{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct MultiCall[]","name":"calls","type":"tuple[]"}],"name":"closeCreditAccount","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"creditManager","outputs":[{"internalType":"contract ICreditManagerV2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"decreaseDebt","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"degenNFT","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"enableToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"expirable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalBorrowedInBlock","outputs":[{"internalType":"uint64","name":"blockLastUpdate","type":"uint64"},{"internalType":"uint128","name":"borrowedInBlock","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"borrower","type":"address"}],"name":"hasOpenedCreditAccount","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"increaseDebt","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"isTokenAllowed","outputs":[{"internalType":"bool","name":"allowed","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"isUpgradeableContract","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"limits","outputs":[{"internalType":"uint128","name":"minBorrowedAmount","type":"uint128"},{"internalType":"uint128","name":"maxBorrowedAmount","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"borrower","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"skipTokenMask","type":"uint256"},{"internalType":"bool","name":"convertWETH","type":"bool"},{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct MultiCall[]","name":"calls","type":"tuple[]"}],"name":"liquidateCreditAccount","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"borrower","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"skipTokenMask","type":"uint256"},{"internalType":"bool","name":"convertWETH","type":"bool"},{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct MultiCall[]","name":"calls","type":"tuple[]"}],"name":"liquidateExpiredCreditAccount","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct MultiCall[]","name":"calls","type":"tuple[]"}],"name":"multicall","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"onBehalfOf","type":"address"},{"internalType":"uint16","name":"leverageFactor","type":"uint16"},{"internalType":"uint16","name":"referralCode","type":"uint16"}],"name":"openCreditAccount","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"borrowedAmount","type":"uint256"},{"internalType":"address","name":"onBehalfOf","type":"address"},{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct 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000000000000000000000000a3e1e0d58fe8dd8c9dd48204699a1178f1b274d8000000000000000000000000b829a5b349b01fc71afe46e50dd6ec0222a6e5990000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _creditManager (address): 0xA3E1e0d58FE8dD8C9dd48204699a1178f1B274D8
Arg [1] : _degenNFT (address): 0xB829a5b349b01fc71aFE46E50dD6Ec0222A6E599
Arg [2] : _expirable (bool): False

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000a3e1e0d58fe8dd8c9dd48204699a1178f1b274d8
Arg [1] : 000000000000000000000000b829a5b349b01fc71afe46e50dd6ec0222a6e599
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000