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// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.9;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@openzeppelin/contracts/utils/Multicall.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "prb-math/contracts/PRBMathUD60x18.sol";
import "@chainlink/contracts/src/v0.8/interfaces/KeeperCompatibleInterface.sol";

import "./interfaces/IVault.sol";
import "./LPToken.sol";

/**
 * @title Storage for Vault, V1
 */
abstract contract VaultStorageV1 {
    /**************************************************************************/
    /* Structures */
    /**************************************************************************/

    /**
     * @notice Tranche state
     * @param realizedValue Realized value
     * @param pendingRedemptions Pending redemptions
     * @param redemptionQueue Current redemption queue (tail)
     * @param processedRedemptionQueue Processed redemption queue (head)
     * @param pendingReturns Mapping of time bucket to pending returns
     */
    struct Tranche {
        uint256 realizedValue;
        uint256 pendingRedemptions;
        uint256 redemptionQueue;
        uint256 processedRedemptionQueue;
        mapping(uint256 => uint256) pendingReturns;
    }

    /**
     * @notice Loan status
     */
    enum LoanStatus {
        Uninitialized,
        Active,
        Liquidated,
        Complete
    }

    /**
     * @notice Loan state
     * @param status Loan status
     * @param maturityTimeBucket Maturity time bucket
     * @param collateralToken Collateral token contract
     * @param collateralTokenId Collateral token ID
     * @param purchasePrice Purchase price in currency tokens
     * @param repayment Repayment in currency tokens
     * @param seniorTrancheReturn Senior tranche return in currency tokens
     */
    struct Loan {
        LoanStatus status;
        uint64 maturityTimeBucket;
        IERC721 collateralToken;
        uint256 collateralTokenId;
        uint256 purchasePrice;
        uint256 repayment;
        uint256 seniorTrancheReturn;
    }

    /**************************************************************************/
    /* Properties and Linked Contracts */
    /**************************************************************************/

    string internal _name;
    IERC20 internal _currencyToken;
    ILoanPriceOracle internal _loanPriceOracle;
    mapping(address => INoteAdapter) internal _noteAdapters;
    EnumerableSet.AddressSet internal _noteTokens;
    LPToken internal _seniorLPToken;
    LPToken internal _juniorLPToken;

    /**************************************************************************/
    /* Parameters */
    /**************************************************************************/

    /**
     * @dev Senior tranche rate in UD60x18 amount per second
     */
    uint256 internal _seniorTrancheRate;

    /**
     * @dev Admin fee rate in UD60x18 fraction of interest
     */
    uint256 internal _adminFeeRate;

    /**************************************************************************/
    /* State */
    /**************************************************************************/

    Tranche internal _seniorTranche;
    Tranche internal _juniorTranche;
    uint256 internal _totalCashBalance;
    /* _totalLoanBalance is computed at runtime */
    uint256 internal _totalAdminFeeBalance;
    uint256 internal _totalWithdrawalBalance;

    /**
     * @dev Mapping of note token contract to loan ID to loan
     */
    mapping(address => mapping(uint256 => Loan)) internal _loans;

    /**
     * @dev Mapping of maturity time bucket to note token contract to list of loan IDs
     */
    mapping(uint256 => mapping(address => uint256[])) internal _pendingLoans;
}

/**
 * @title Storage for Vault, aggregated
 */
abstract contract VaultStorage is VaultStorageV1 {

}

/**
 * @title Vault
 */
contract Vault is
    Initializable,
    AccessControlUpgradeable,
    PausableUpgradeable,
    ReentrancyGuardUpgradeable,
    VaultStorage,
    ERC721Holder,
    ERC165,
    Multicall,
    KeeperCompatibleInterface,
    IVault
{
    using SafeERC20 for IERC20;
    using EnumerableSet for EnumerableSet.AddressSet;

    /**************************************************************************/
    /* Constants */
    /**************************************************************************/

    /**
     * @notice Implementation version
     */
    string public constant IMPLEMENTATION_VERSION = "1.4";

    /**
     * @notice Time bucket duration in seconds
     */
    uint256 public constant TIME_BUCKET_DURATION = 7 days;

    /**
     * @notice Number of share price proration buckets
     */
    uint256 public constant SHARE_PRICE_PRORATION_BUCKETS = 14;

    /**
     * @notice Total share price proration window in seconds
     */
    uint256 public constant TOTAL_SHARE_PRICE_PRORATION_DURATION = TIME_BUCKET_DURATION * SHARE_PRICE_PRORATION_BUCKETS;

    /**
     * @notice One in UD60x18
     */
    uint256 private constant ONE_UD60X18 = 1e18;

    /**************************************************************************/
    /* Access Control Roles */
    /**************************************************************************/

    /**
     * @notice Collateral liquidator role
     */
    bytes32 public constant COLLATERAL_LIQUIDATOR_ROLE = keccak256("COLLATERAL_LIQUIDATOR");

    /**
     * @notice Emergency administrator role
     */
    bytes32 public constant EMERGENCY_ADMIN_ROLE = keccak256("EMERGENCY_ADMIN");

    /**************************************************************************/
    /* Errors */
    /**************************************************************************/

    /**
     * @notice Invalid address (e.g. zero address)
     */
    error InvalidAddress();

    /**
     * @notice Parameter out of bounds
     */
    error ParameterOutOfBounds();

    /**
     * @notice Unsupported token decimals
     */
    error UnsupportedTokenDecimals();

    /**
     * @notice Unsupported note token
     */
    error UnsupportedNoteToken();

    /**
     * @notice Unsupported note parameters
     */
    error UnsupportedNoteParameters();

    /**
     * @notice Insolvent tranche
     */
    error InsolventTranche(TrancheId trancheId);

    /**
     * @notice Purchase price too low
     */
    error PurchasePriceTooLow();

    /**
     * @notice Purchase price too high
     */
    error PurchasePriceTooHigh();

    /**
     * @notice Insufficient cash available
     */
    error InsufficientCashAvailable();

    /**
     * @notice Interest rate too low
     */
    error InterestRateTooLow();

    /**
     * @notice Invalid loan status
     */
    error InvalidLoanStatus();

    /**
     * @notice Loan not repaid
     */
    error LoanNotRepaid();

    /**
     * @notice Loan not expired
     */
    error LoanNotExpired();

    /**
     * @notice Call failed
     */
    error CallFailed();

    /**************************************************************************/
    /* Events */
    /**************************************************************************/

    /**
     * @notice Emitted when senior tranche rate is updated
     * @param rate New senior tranche rate in UD60x18 amount per second
     */
    event SeniorTrancheRateUpdated(uint256 rate);

    /**
     * @notice Emitted when admin fee rate is updated
     * @param rate New admin fee rate in UD60x18 fraction of interest
     */
    event AdminFeeRateUpdated(uint256 rate);

    /**
     * @notice Emitted when loan price oracle contract is updated
     * @param loanPriceOracle New loan price oracle contract
     */
    event LoanPriceOracleUpdated(address loanPriceOracle);

    /**
     * @notice Emitted when note adapter is updated
     * @param noteToken Note token contract
     * @param noteAdapter Note adapter contract
     */
    event NoteAdapterUpdated(address indexed noteToken, address noteAdapter);

    /**
     * @notice Emitted when admin fees are withdrawn
     * @param account Recipient account
     * @param amount Amount of currency tokens withdrawn
     */
    event AdminFeesWithdrawn(address indexed account, uint256 amount);

    /**************************************************************************/
    /* Constructor */
    /**************************************************************************/

    /**
     * @notice Vault constructor (for implementation)
     * @custom:oz-upgrades-unsafe-allow constructor
     */
    constructor() initializer {}

    /**
     * @notice Vault constructor (for proxy)
     * @param name_ Vault name
     * @param currencyToken_ Currency token contract
     * @param loanPriceOracle_ Loan price oracle contract
     * @param seniorLPToken_ Senior LP token contract
     * @param juniorLPToken_ Junior LP token contract
     */
    function initialize(
        string memory name_,
        IERC20 currencyToken_,
        ILoanPriceOracle loanPriceOracle_,
        LPToken seniorLPToken_,
        LPToken juniorLPToken_
    ) external initializer {
        if (address(currencyToken_) == address(0)) revert InvalidAddress();
        if (address(loanPriceOracle_) == address(0)) revert InvalidAddress();
        if (address(seniorLPToken_) == address(0)) revert InvalidAddress();
        if (address(juniorLPToken_) == address(0)) revert InvalidAddress();

        if (IERC20Metadata(address(currencyToken_)).decimals() != 18) revert UnsupportedTokenDecimals();

        __AccessControl_init();
        __Pausable_init();
        __ReentrancyGuard_init();

        _name = name_;
        _currencyToken = currencyToken_;
        _loanPriceOracle = loanPriceOracle_;
        _seniorLPToken = seniorLPToken_;
        _juniorLPToken = juniorLPToken_;

        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(EMERGENCY_ADMIN_ROLE, msg.sender);
    }

    /**************************************************************************/
    /* Interface Getters (defined in IVault) */
    /**************************************************************************/

    /**
     * @inheritdoc IVault
     */
    function name() external view returns (string memory) {
        return _name;
    }

    /**
     * @inheritdoc IVault
     */
    function currencyToken() external view returns (IERC20) {
        return _currencyToken;
    }

    /**
     * @inheritdoc IVault
     */
    function lpToken(TrancheId trancheId) external view returns (IERC20) {
        return IERC20(address(_lpToken(trancheId)));
    }

    /**
     * @inheritdoc IVault
     */
    function loanPriceOracle() external view returns (ILoanPriceOracle) {
        return _loanPriceOracle;
    }

    /**
     * @inheritdoc IVault
     */
    function noteAdapters(address noteToken) external view returns (INoteAdapter) {
        return _noteAdapters[noteToken];
    }

    /**
     * @inheritdoc IVault
     */
    function supportedNoteTokens() external view returns (address[] memory) {
        return _noteTokens.values();
    }

    /**
     * @inheritdoc IVault
     */
    function sharePrice(TrancheId trancheId) external view returns (uint256) {
        return _computeSharePrice(trancheId);
    }

    /**
     * @inheritdoc IVault
     */
    function redemptionSharePrice(TrancheId trancheId) external view returns (uint256) {
        return _computeRedemptionSharePrice(trancheId);
    }

    /**
     * @inheritdoc IVault
     */
    function utilization() external view returns (uint256) {
        return _computeUtilization(0);
    }

    /**
     * @inheritdoc IVault
     */
    function utilization(uint256 additionalLoanBalance) external view returns (uint256) {
        return _computeUtilization(additionalLoanBalance);
    }

    /**************************************************************************/
    /* Additional Getters */
    /**************************************************************************/

    /**
     * @notice Get tranche state
     * @param trancheId Tranche
     * @return realizedValue Realized value
     * @return estimatedValue Estimated value
     * @return pendingRedemptions Pending redemptions
     * @return redemptionQueue Current redemption queue
     * @return processedRedemptionQueue Processed redemption queue
     * @return depositSharePrice Deposit share price in UD60x18
     * @return redemptionSharePrice_ Redemption share price in UD60x18
     */
    function trancheState(TrancheId trancheId)
        external
        view
        returns (
            uint256 realizedValue,
            uint256 estimatedValue,
            uint256 pendingRedemptions,
            uint256 redemptionQueue,
            uint256 processedRedemptionQueue,
            uint256 depositSharePrice,
            uint256 redemptionSharePrice_
        )
    {
        Tranche storage tranche = _trancheState(trancheId);
        return (
            tranche.realizedValue,
            _computeEstimatedValue(trancheId),
            tranche.pendingRedemptions,
            tranche.redemptionQueue,
            tranche.processedRedemptionQueue,
            _computeSharePrice(trancheId),
            _computeRedemptionSharePrice(trancheId)
        );
    }

    /**
     * @notice Get vault balance state
     * @return totalCashBalance Total cash balance
     * @return totalLoanBalance Total loan balance
     * @return totalAdminFeeBalance Total admin fee balance
     * @return totalWithdrawalBalance Total withdrawal balance
     */
    function balanceState()
        external
        view
        returns (
            uint256 totalCashBalance,
            uint256 totalLoanBalance,
            uint256 totalAdminFeeBalance,
            uint256 totalWithdrawalBalance
        )
    {
        return (_totalCashBalance, _totalLoanBalance(), _totalAdminFeeBalance, _totalWithdrawalBalance);
    }

    /**
     * @notice Get Loan state
     * @param noteToken Note token contract
     * @param loanId Loan ID
     * @return Loan state
     */
    function loanState(address noteToken, uint256 loanId) external view returns (Loan memory) {
        return _loans[noteToken][loanId];
    }

    /**
     * @notice Get Pending Loans
     * @param timeBucket Time bucket
     * @param noteToken Note token contract
     * @return Loan IDs
     */
    function pendingLoans(uint64 timeBucket, address noteToken) external view returns (uint256[] memory) {
        return _pendingLoans[uint256(timeBucket)][noteToken];
    }

    /**
     * @notice Get senior tranche rate
     * @return Senior tranche rate in UD60x18 amount per second
     */
    function seniorTrancheRate() external view returns (uint256) {
        return _seniorTrancheRate;
    }

    /**
     * @notice Get admin fee rate
     * @return Admin fee rate in UD60x18 fraction of interest
     */
    function adminFeeRate() external view returns (uint256) {
        return _adminFeeRate;
    }

    /**************************************************************************/
    /* Internal Helper Functions */
    /**************************************************************************/

    /**
     * @dev Get LP token contract
     */
    function _lpToken(TrancheId trancheId) internal view returns (LPToken) {
        return (trancheId == TrancheId.Senior) ? _seniorLPToken : _juniorLPToken;
    }

    /**
     * @dev Get tranche state
     */
    function _trancheState(TrancheId trancheId) internal view returns (Tranche storage) {
        return (trancheId == TrancheId.Senior) ? _seniorTranche : _juniorTranche;
    }

    /**
     * @dev Get the total loan balance, computed indirectly from tranche
     * realized values and cash balances
     * @return Total loan balance in UD60x18
     */
    function _totalLoanBalance() internal view returns (uint256) {
        return _seniorTranche.realizedValue + _juniorTranche.realizedValue - _totalCashBalance;
    }

    /**
     * @dev Get and validate the note adapter for a note token
     */
    function _getNoteAdapter(address noteToken) internal view returns (INoteAdapter) {
        INoteAdapter noteAdapter = _noteAdapters[noteToken];

        /* Validate note token is supported */
        if (noteAdapter == INoteAdapter(address(0x0))) revert UnsupportedNoteToken();

        return noteAdapter;
    }

    /**
     * @dev Convert Unix timestamp to time bucket
     */
    function _timestampToTimeBucket(uint256 timestamp) internal pure returns (uint256) {
        return timestamp / TIME_BUCKET_DURATION;
    }

    /**
     * @dev Convert time bucket to Unix timestamp
     */
    function _timeBucketToTimestamp(uint256 timeBucket) internal pure returns (uint256) {
        return timeBucket * TIME_BUCKET_DURATION;
    }

    /**
     * @dev Compute solvent value of the tranche
     * @param trancheId tranche
     * @return Solvent value in currency tokens
     */
    function _computeSolventValue(TrancheId trancheId) internal view returns (uint256) {
        Tranche storage tranche = _trancheState(trancheId);
        return
            tranche.realizedValue > tranche.pendingRedemptions ? tranche.realizedValue - tranche.pendingRedemptions : 0;
    }

    /**
     * @dev Compute estimated value of the tranche, including prorated pending
     * returns
     * @param trancheId tranche
     * @return Estimated value in currency tokens
     */
    function _computeEstimatedValue(TrancheId trancheId) internal view returns (uint256) {
        Tranche storage tranche = _trancheState(trancheId);

        /* Get the current time bucket */
        uint256 currentTimeBucket = _timestampToTimeBucket(block.timestamp);

        /* Compute elapsed time into current time bucket and convert to UD60x18 */
        uint256 elapsedTimeIntoBucket = PRBMathUD60x18.fromUint(
            block.timestamp - _timeBucketToTimestamp(currentTimeBucket)
        );

        /* Sum the prorated returns from pending returns in each time bucket */
        uint256 proratedReturns;
        for (uint256 i; i < SHARE_PRICE_PRORATION_BUCKETS; ++i) {
            /* Prorated Returns[i] = ((Elapsed Time + W * (N - 1 - i)) / (W * N)) * Pending Returns[i]  */
            proratedReturns += PRBMathUD60x18.div(
                PRBMathUD60x18.mul(
                    elapsedTimeIntoBucket +
                        PRBMathUD60x18.fromUint(TIME_BUCKET_DURATION * (SHARE_PRICE_PRORATION_BUCKETS - 1 - i)),
                    tranche.pendingReturns[currentTimeBucket + i]
                ),
                PRBMathUD60x18.fromUint(TOTAL_SHARE_PRICE_PRORATION_DURATION)
            );
        }

        /* Return the realized value plus prorated returns */
        return _computeSolventValue(trancheId) + proratedReturns;
    }

    /**
     * @dev Check if a tranche is solvent
     * @param trancheId tranche
     * @return Tranche is solvent
     */
    function _isSolvent(TrancheId trancheId) internal view returns (bool) {
        Tranche storage tranche = _trancheState(trancheId);
        return tranche.realizedValue > tranche.pendingRedemptions || _lpToken(trancheId).totalSupply() == 0;
    }

    /**
     * @dev Compute share price of tranche including prorated pending returns
     * @param trancheId tranche
     * @return Share price in UD60x18
     */
    function _computeSharePrice(TrancheId trancheId) internal view returns (uint256) {
        uint256 totalSupply = _lpToken(trancheId).totalSupply();
        if (totalSupply == 0) {
            return ONE_UD60X18;
        }
        return PRBMathUD60x18.div(_computeEstimatedValue(trancheId), totalSupply);
    }

    /**
     * @dev Compute redemption share price of tranche
     * @param trancheId tranche
     * @return Redemption share price in UD60x18
     */
    function _computeRedemptionSharePrice(TrancheId trancheId) internal view returns (uint256) {
        uint256 totalSupply = _lpToken(trancheId).totalSupply();
        if (totalSupply == 0) {
            return ONE_UD60X18;
        }
        return PRBMathUD60x18.div(_computeSolventValue(trancheId), totalSupply);
    }

    /**
     * @dev Compute utilization
     * @param additionalLoanBalance Additional loan balance in currency tokens
     * @return Utilization in UD60x18, between 0 and 1
     */
    function _computeUtilization(uint256 additionalLoanBalance) internal view returns (uint256) {
        uint256 totalLoanBalance = _totalLoanBalance();
        uint256 totalBalance = _totalCashBalance + totalLoanBalance;
        return (totalBalance == 0) ? 0 : PRBMathUD60x18.div(totalLoanBalance + additionalLoanBalance, totalBalance);
    }

    /**
     * @dev Process redemptions for tranche
     * @param tranche Tranche
     * @param proceeds Proceeds in currency tokens
     */
    function _processRedemptions(Tranche storage tranche, uint256 proceeds) internal returns (uint256) {
        /* Compute maximum redemption possible */
        uint256 redemptionAmount = Math.min(tranche.realizedValue, Math.min(tranche.pendingRedemptions, proceeds));

        /* Update tranche redemption state */
        tranche.pendingRedemptions -= redemptionAmount;
        tranche.processedRedemptionQueue += redemptionAmount;
        tranche.realizedValue -= redemptionAmount;

        /* Add redemption to withdrawal balance */
        _totalWithdrawalBalance += redemptionAmount;

        /* Return amount of proceeds leftover */
        return proceeds - redemptionAmount;
    }

    /**
     * @dev Process new proceeds by applying them to redemptions and undeployed
     * cash
     * @param proceeds Proceeds in currency tokens
     */
    function _processProceeds(uint256 proceeds) internal {
        /* Process senior redemptions */
        proceeds = _processRedemptions(_seniorTranche, proceeds);
        /* Process junior redemptions */
        proceeds = _processRedemptions(_juniorTranche, proceeds);
        /* Update undeployed cash balance */
        _totalCashBalance += proceeds;
    }

    /**
     * @dev Update tranche state with currency deposit and mint LP tokens to
     * depositer
     * @param trancheId tranche
     * @param amount Amount of currency tokens
     */
    function _deposit(TrancheId trancheId, uint256 amount) internal {
        /* Check tranche is solvent */
        if (!_isSolvent(trancheId)) revert InsolventTranche(trancheId);

        /* Compute current share price */
        uint256 currentSharePrice = _computeSharePrice(trancheId);

        /* Compute number of shares to mint from current tranche share price */
        uint256 shares = PRBMathUD60x18.div(amount, currentSharePrice);

        /* Increase realized value of tranche */
        _trancheState(trancheId).realizedValue += amount;

        /* Process new proceeds */
        _processProceeds(amount);

        /* Mint LP tokens to user */
        _lpToken(trancheId).mint(msg.sender, shares);

        emit Deposited(msg.sender, trancheId, amount, shares);
    }

    /**
     * @dev Calculate purchase price of a loan
     * @param loanInfo Loan info
     */
    function _priceLoan(INoteAdapter.LoanInfo memory loanInfo, INoteAdapter.AssetInfo[] memory collateralAssets)
        internal
        view
        returns (uint256)
    {
        uint256 purchasePrice = 0;

        /* Calculate principal and repayment per asset */
        uint256 collateralCount = PRBMathUD60x18.fromUint(collateralAssets.length);
        uint256 principalPerAsset = PRBMathUD60x18.div(loanInfo.principal, collateralCount);
        uint256 repaymentPerAsset = PRBMathUD60x18.div(loanInfo.repayment, collateralCount);

        /* For each collateral asset */
        for (uint256 i; i < collateralAssets.length; ++i) {
            purchasePrice += _loanPriceOracle.priceLoan(
                collateralAssets[i].token,
                collateralAssets[i].tokenId,
                principalPerAsset,
                repaymentPerAsset,
                loanInfo.duration,
                loanInfo.maturity,
                _computeUtilization(purchasePrice)
            );
        }

        return purchasePrice;
    }

    /**
     * @dev Calculate purchase price of note and update tranche state with note
     * purchase
     * @param noteToken Note token contract
     * @param noteTokenId Note token ID
     * @param minPurchasePrice Minimum purchase price in currency tokens
     */
    function _sellNote(
        address noteToken,
        uint256 noteTokenId,
        uint256 minPurchasePrice
    ) internal returns (uint256) {
        /* Lookup note adapter */
        INoteAdapter noteAdapter = _getNoteAdapter(noteToken);

        /* Check if loan parameters are supported */
        if (!noteAdapter.isSupported(noteTokenId, address(_currencyToken))) revert UnsupportedNoteParameters();

        /* Get loan info */
        INoteAdapter.LoanInfo memory loanInfo = noteAdapter.getLoanInfo(noteTokenId);

        /* Compute loan purchase price */
        uint256 purchasePrice = _priceLoan(loanInfo, noteAdapter.getLoanAssets(noteTokenId));

        /* Validate purchase price */
        if (purchasePrice < minPurchasePrice) revert PurchasePriceTooLow();

        /* Validate repayment */
        if (purchasePrice >= loanInfo.repayment) revert PurchasePriceTooHigh();

        /* Validate cash available */
        if (purchasePrice > _totalCashBalance) revert InsufficientCashAvailable();

        /* Calculate senior tranche contribution based on realized value proportion */
        /* Senior Tranche Contribution = (D_s * Purchase Price) / (D_s + D_j) */
        uint256 seniorTrancheContribution = PRBMathUD60x18.div(
            PRBMathUD60x18.mul(_seniorTranche.realizedValue, purchasePrice),
            _seniorTranche.realizedValue + _juniorTranche.realizedValue
        );

        /* Calculate senior tranche return */
        /* Senior Tranche Return = Senior Tranche Contribution * r * t */
        uint256 seniorTrancheReturn = PRBMathUD60x18.mul(
            seniorTrancheContribution,
            PRBMathUD60x18.mul(_seniorTrancheRate, PRBMathUD60x18.fromUint(loanInfo.maturity - block.timestamp))
        );

        /* Validate senior tranche return */
        if (loanInfo.repayment - purchasePrice < seniorTrancheReturn) revert InterestRateTooLow();

        /* Calculate junior tranche return */
        /* Junior Tranche Return = Repayment - Purchase Price - Senior Tranche Return */
        uint256 juniorTrancheReturn = loanInfo.repayment - purchasePrice - seniorTrancheReturn;

        /* Compute loan maturity time bucket */
        uint256 maturityTimeBucket = _timestampToTimeBucket(loanInfo.maturity);

        /* Schedule pending tranche returns */
        _seniorTranche.pendingReturns[maturityTimeBucket] += seniorTrancheReturn;
        _juniorTranche.pendingReturns[maturityTimeBucket] += juniorTrancheReturn;

        /* Update total cash balance */
        _totalCashBalance -= purchasePrice;

        /* Store loan state */
        Loan storage loan = _loans[noteToken][loanInfo.loanId];
        loan.status = LoanStatus.Active;
        loan.maturityTimeBucket = uint64(maturityTimeBucket);
        loan.collateralToken = IERC721(loanInfo.collateralToken);
        loan.collateralTokenId = loanInfo.collateralTokenId;
        loan.purchasePrice = purchasePrice;
        loan.repayment = loanInfo.repayment;
        loan.seniorTrancheReturn = seniorTrancheReturn;

        /* Add loan to pending loan ids */
        _pendingLoans[maturityTimeBucket][noteToken].push(loanInfo.loanId);

        emit NotePurchased(
            msg.sender,
            noteToken,
            noteTokenId,
            loanInfo.loanId,
            purchasePrice,
            [seniorTrancheContribution, purchasePrice - seniorTrancheContribution]
        );

        return purchasePrice;
    }

    /**************************************************************************/
    /* User API */
    /**************************************************************************/

    /**
     * @inheritdoc IVault
     */
    function deposit(TrancheId trancheId, uint256 amount) external whenNotPaused nonReentrant {
        /* Validate amount */
        if (amount == 0) revert ParameterOutOfBounds();

        /* Deposit into tranche */
        _deposit(trancheId, amount);

        /* Transfer cash from user to vault */
        _currencyToken.safeTransferFrom(msg.sender, address(this), amount);
    }

    /**
     * @inheritdoc IVault
     */
    function priceNote(address noteToken, uint256 noteTokenId) external view returns (uint256) {
        /* Lookup note adapter */
        INoteAdapter noteAdapter = _getNoteAdapter(noteToken);

        /* Check if loan parameters are supported */
        if (!noteAdapter.isSupported(noteTokenId, address(_currencyToken))) revert UnsupportedNoteParameters();

        /* Get loan info */
        INoteAdapter.LoanInfo memory loanInfo = noteAdapter.getLoanInfo(noteTokenId);

        /* Compute loan purchase price */
        return _priceLoan(loanInfo, noteAdapter.getLoanAssets(noteTokenId));
    }

    /**
     * @inheritdoc IVault
     */
    function sellNote(
        address noteToken,
        uint256 noteTokenId,
        uint256 minPurchasePrice
    ) external whenNotPaused nonReentrant returns (uint256) {
        /* Purchase the note */
        uint256 purchasePrice = _sellNote(noteToken, noteTokenId, minPurchasePrice);

        /* Transfer promissory note from user to vault */
        IERC721(noteToken).safeTransferFrom(msg.sender, address(this), noteTokenId);

        /* Transfer cash from vault to user */
        _currencyToken.safeTransfer(msg.sender, purchasePrice);

        return purchasePrice;
    }

    /**
     * @inheritdoc IVault
     */
    function sellNoteAndDeposit(
        address noteToken,
        uint256 noteTokenId,
        uint256 minPurchasePrice,
        uint256[2] calldata allocation
    ) external whenNotPaused nonReentrant returns (uint256) {
        /* Check allocations sum to one */
        if (allocation[0] + allocation[1] != ONE_UD60X18) revert ParameterOutOfBounds();

        /* Purchase the note */
        uint256 purchasePrice = _sellNote(noteToken, noteTokenId, minPurchasePrice);

        /* Calculate split of sale proceeds */
        uint256 seniorTrancheAmount = PRBMathUD60x18.mul(allocation[0], purchasePrice);
        uint256 juniorTrancheAmount = purchasePrice - seniorTrancheAmount;

        /* Deposit sale proceeds in tranches */
        if (seniorTrancheAmount != 0) _deposit(TrancheId.Senior, seniorTrancheAmount);
        if (juniorTrancheAmount != 0) _deposit(TrancheId.Junior, juniorTrancheAmount);

        /* Transfer promissory note from user to vault */
        IERC721(noteToken).safeTransferFrom(msg.sender, address(this), noteTokenId);

        return purchasePrice;
    }

    /**
     * @inheritdoc IVault
     */
    function redeem(TrancheId trancheId, uint256 shares) external whenNotPaused nonReentrant {
        /* Validate shares */
        if (shares == 0) revert ParameterOutOfBounds();

        Tranche storage tranche = _trancheState(trancheId);

        /* Check tranche is solvent */
        if (!_isSolvent(trancheId)) revert InsolventTranche(trancheId);

        /* Compute current redemption share price */
        uint256 currentRedemptionSharePrice = _computeRedemptionSharePrice(trancheId);

        /* Compute redemption amount */
        uint256 redemptionAmount = PRBMathUD60x18.mul(shares, currentRedemptionSharePrice);

        /* Schedule redemption with user's token state and burn LP tokens */
        _lpToken(trancheId).redeem(msg.sender, shares, redemptionAmount, tranche.redemptionQueue);

        /* Schedule redemption in tranche */
        tranche.pendingRedemptions += redemptionAmount;
        tranche.redemptionQueue += redemptionAmount;

        /* Process redemptions from undeployed cash */
        uint256 immediateRedemptionAmount = Math.min(redemptionAmount, _totalCashBalance);
        _totalCashBalance -= immediateRedemptionAmount;
        _processProceeds(immediateRedemptionAmount);

        emit Redeemed(msg.sender, trancheId, shares, redemptionAmount);
    }

    /**
     * @inheritdoc IVault
     */
    function withdraw(TrancheId trancheId, uint256 maxAmount) external whenNotPaused nonReentrant {
        Tranche storage tranche = _trancheState(trancheId);

        /* Calculate amount available to withdraw */
        uint256 amount = Math.min(
            _lpToken(trancheId).redemptionAvailable(msg.sender, tranche.processedRedemptionQueue),
            maxAmount
        );

        if (amount != 0) {
            /* Update user's token state with redemption */
            _lpToken(trancheId).withdraw(msg.sender, amount, tranche.processedRedemptionQueue);

            /* Decrease total withdrawal balance */
            _totalWithdrawalBalance -= amount;

            /* Transfer cash from vault to user */
            _currencyToken.safeTransfer(msg.sender, amount);
        }

        emit Withdrawn(msg.sender, trancheId, amount);
    }

    /**************************************************************************/
    /* Collateral API */
    /**************************************************************************/

    /**
     * @inheritdoc IVault
     */
    function withdrawCollateral(address noteToken, uint256 loanId)
        external
        nonReentrant
        onlyRole(COLLATERAL_LIQUIDATOR_ROLE)
    {
        /* Lookup note adapter */
        INoteAdapter noteAdapter = _getNoteAdapter(noteToken);

        /* Lookup loan state */
        Loan storage loan = _loans[noteToken][loanId];

        /* Validate loan is liquidated */
        if (loan.status != LoanStatus.Liquidated) revert InvalidLoanStatus();

        /* Get unwrap target and calldata */
        (address target, bytes memory data) = noteAdapter.getUnwrapCalldata(loanId);

        /* Call unwrap if required */
        if (target != address(0x0)) {
            (bool success, ) = target.call(data);
            if (!success) revert CallFailed();
        }

        /* Transfer collateral to liquidator */
        loan.collateralToken.safeTransferFrom(address(this), msg.sender, loan.collateralTokenId);

        emit CollateralWithdrawn(noteToken, loanId, address(loan.collateralToken), loan.collateralTokenId, msg.sender);
    }

    /**************************************************************************/
    /* Callbacks */
    /**************************************************************************/

    /**
     * @inheritdoc ILoanReceiver
     */
    function onLoanRepaid(address noteToken, uint256 loanId) public nonReentrant {
        /* Lookup note adapter */
        INoteAdapter noteAdapter = _getNoteAdapter(noteToken);

        /* Lookup loan state */
        Loan storage loan = _loans[noteToken][loanId];

        /* Validate loan is active */
        if (loan.status != LoanStatus.Active) revert InvalidLoanStatus();

        /* Validate loan was repaid */
        if (!noteAdapter.isRepaid(loanId)) revert LoanNotRepaid();

        /* Calculate tranche returns */
        uint256 seniorTrancheReturn = loan.seniorTrancheReturn;
        uint256 juniorTrancheReturn = loan.repayment - loan.purchasePrice - seniorTrancheReturn;

        /* Unschedule pending returns */
        _seniorTranche.pendingReturns[loan.maturityTimeBucket] -= seniorTrancheReturn;
        _juniorTranche.pendingReturns[loan.maturityTimeBucket] -= juniorTrancheReturn;

        /* Calculate and apply admin fee */
        seniorTrancheReturn -= PRBMathUD60x18.mul(_adminFeeRate, seniorTrancheReturn);
        juniorTrancheReturn -= PRBMathUD60x18.mul(_adminFeeRate, juniorTrancheReturn);
        uint256 adminFee = loan.repayment - loan.purchasePrice - seniorTrancheReturn - juniorTrancheReturn;

        /* Increase admin fee balance */
        _totalAdminFeeBalance += adminFee;

        /* Increase tranche realized values */
        _seniorTranche.realizedValue += seniorTrancheReturn;
        _juniorTranche.realizedValue += juniorTrancheReturn;

        /* Process new proceeds */
        _processProceeds(loan.repayment - adminFee);

        /* Mark loan complete */
        loan.status = LoanStatus.Complete;

        emit LoanRepaid(noteToken, loanId, adminFee, [seniorTrancheReturn, juniorTrancheReturn]);
    }

    /**
     * @inheritdoc ILoanReceiver
     */
    function onLoanExpired(address noteToken, uint256 loanId) public nonReentrant {
        /* Lookup note adapter */
        INoteAdapter noteAdapter = _getNoteAdapter(noteToken);

        /* Lookup loan state */
        Loan storage loan = _loans[noteToken][loanId];

        /* Validate loan is active */
        if (loan.status != LoanStatus.Active) revert InvalidLoanStatus();

        /* Validate loan is not repaid and expired */
        if (noteAdapter.isRepaid(loanId) || !noteAdapter.isExpired(loanId)) revert LoanNotExpired();

        /* Calculate tranche returns */
        uint256 seniorTrancheReturn = loan.seniorTrancheReturn;
        uint256 juniorTrancheReturn = loan.repayment - loan.purchasePrice - seniorTrancheReturn;

        /* Unschedule pending returns */
        _seniorTranche.pendingReturns[loan.maturityTimeBucket] -= seniorTrancheReturn;
        _juniorTranche.pendingReturns[loan.maturityTimeBucket] -= juniorTrancheReturn;

        /* Compute tranche losses */
        uint256 juniorTrancheLoss = Math.min(loan.purchasePrice, _juniorTranche.realizedValue);
        uint256 seniorTrancheLoss = loan.purchasePrice - juniorTrancheLoss;

        /* Decrease tranche realized values */
        _seniorTranche.realizedValue -= seniorTrancheLoss;
        _juniorTranche.realizedValue -= juniorTrancheLoss;

        /* Update senior tranche return for collateral liquidation */
        loan.seniorTrancheReturn += seniorTrancheLoss;

        /* Mark loan liquidated in loan state */
        loan.status = LoanStatus.Liquidated;

        /* Get liquidate target and calldata */
        (address target, bytes memory data) = noteAdapter.getLiquidateCalldata(loanId);
        if (target == address(0x0)) revert InvalidAddress();

        /* Call liquidate on lending platform */
        (bool success, ) = target.call(data);
        if (!success) revert CallFailed();

        emit LoanLiquidated(noteToken, loanId, [seniorTrancheLoss, juniorTrancheLoss]);
    }

    /**
     * @inheritdoc IVault
     */
    function onCollateralLiquidated(
        address noteToken,
        uint256 loanId,
        uint256 proceeds
    ) external nonReentrant onlyRole(COLLATERAL_LIQUIDATOR_ROLE) {
        /* Lookup loan state */
        Loan storage loan = _loans[noteToken][loanId];

        /* Validate loan is liquidated */
        if (loan.status != LoanStatus.Liquidated) revert InvalidLoanStatus();

        /* Compute tranche repayments */
        uint256 seniorTrancheRepayment = Math.min(proceeds, loan.seniorTrancheReturn);
        uint256 juniorTrancheRepayment = proceeds - seniorTrancheRepayment;

        /* Increase tranche realized values */
        _seniorTranche.realizedValue += seniorTrancheRepayment;
        _juniorTranche.realizedValue += juniorTrancheRepayment;

        /* Process proceeds */
        _processProceeds(proceeds);

        /* Mark loan complete */
        loan.status = LoanStatus.Complete;

        /* Transfer cash from liquidator to vault */
        _currencyToken.safeTransferFrom(msg.sender, address(this), proceeds);

        emit CollateralLiquidated(noteToken, loanId, [seniorTrancheRepayment, juniorTrancheRepayment]);
    }

    /**************************************************************************/
    /* Keeper Integration */
    /**************************************************************************/

    /**
     * @inheritdoc KeeperCompatibleInterface
     */
    function checkUpkeep(bytes calldata) external view returns (bool, bytes memory) {
        /* Compute current time bucket */
        uint256 currentTimeBucket = _timestampToTimeBucket(block.timestamp);

        /* For each note token */
        uint256 numNoteTokens = _noteTokens.length();
        for (uint256 i; i < numNoteTokens; ++i) {
            /* Get note token */
            address noteToken = _noteTokens.at(i);

            /* Lookup note adapter */
            INoteAdapter noteAdapter = _getNoteAdapter(noteToken);

            /* Check previous, current, and future time buckets */
            for (
                uint256 timeBucket = currentTimeBucket - 1;
                timeBucket < currentTimeBucket + SHARE_PRICE_PRORATION_BUCKETS;
                timeBucket++
            ) {
                /* For each loan ID */
                uint256 numLoans = _pendingLoans[timeBucket][noteToken].length;
                for (uint256 j; j < numLoans; ++j) {
                    /* Get loan ID */
                    uint256 loanId = _pendingLoans[timeBucket][noteToken][j];

                    /* Lookup loan state */
                    Loan memory loan = _loans[noteToken][loanId];

                    /* Make sure loan is active */
                    if (loan.status != LoanStatus.Active) {
                        continue;
                    } else if (noteAdapter.isRepaid(loanId)) {
                        /* Call onLoanRepaid() */
                        return (true, abi.encode(uint8(0), noteToken, loanId));
                    } else if (noteAdapter.isExpired(loanId)) {
                        /* Call onLoanExpired() */
                        return (true, abi.encode(uint8(1), noteToken, loanId));
                    }
                }
            }
        }

        return (false, "");
    }

    /**
     * @inheritdoc KeeperCompatibleInterface
     */
    function performUpkeep(bytes calldata performData) external {
        (uint8 code, address noteToken, uint256 loanId) = abi.decode(performData, (uint8, address, uint256));

        /* Call appropriate callback based on code */
        if (code == 0) {
            onLoanRepaid(noteToken, loanId);
        } else if (code == 1) {
            onLoanExpired(noteToken, loanId);
        } else {
            revert ParameterOutOfBounds();
        }
    }

    /**************************************************************************/
    /* Setters */
    /**************************************************************************/

    /**
     * @notice Set the senior tranche rate
     *
     * Emits a {SeniorTrancheRateUpdated} event.
     *
     * @param rate Rate in UD60x18 amount per second
     */
    function setSeniorTrancheRate(uint256 rate) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (rate == 0 || rate >= ONE_UD60X18) revert ParameterOutOfBounds();
        _seniorTrancheRate = rate;
        emit SeniorTrancheRateUpdated(rate);
    }

    /**
     * @notice Set the admin fee rate
     *
     * Emits a {AdminFeeRateUpdated} event.
     *
     * @param rate Rate in UD60x18 fraction of interest
     */
    function setAdminFeeRate(uint256 rate) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (rate == 0 || rate >= ONE_UD60X18) revert ParameterOutOfBounds();
        _adminFeeRate = rate;
        emit AdminFeeRateUpdated(rate);
    }

    /**
     * @notice Set the loan price oracle contract
     *
     * Emits a {LoanPriceOracleUpdated} event.
     *
     * @param loanPriceOracle_ Loan price oracle contract
     */
    function setLoanPriceOracle(address loanPriceOracle_) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (loanPriceOracle_ == address(0)) revert InvalidAddress();
        _loanPriceOracle = ILoanPriceOracle(loanPriceOracle_);
        emit LoanPriceOracleUpdated(loanPriceOracle_);
    }

    /**
     * @notice Set note adapter contract
     *
     * Emits a {NoteAdapterUpdated} event.
     *
     * @param noteToken Note token contract
     * @param noteAdapter Note adapter contract
     */
    function setNoteAdapter(address noteToken, address noteAdapter) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (noteToken == address(0)) revert InvalidAddress();
        _noteAdapters[noteToken] = INoteAdapter(noteAdapter);
        if (noteAdapter != address(0)) {
            _noteTokens.add(noteToken);
        } else {
            _noteTokens.remove(noteToken);
        }
        emit NoteAdapterUpdated(noteToken, noteAdapter);
    }

    /**
     * @notice Pause contract
     */
    function pause() external onlyRole(EMERGENCY_ADMIN_ROLE) {
        _pause();
    }

    /**
     * @notice Unpause contract
     */
    function unpause() external onlyRole(EMERGENCY_ADMIN_ROLE) {
        _unpause();
    }

    /**************************************************************************/
    /* Admin Fees API */
    /**************************************************************************/

    /**
     * @notice Withdraw admin fees
     *
     * Emits a {AdminFeesWithdrawn} event.
     *
     * @param recipient Recipient account
     * @param amount Amount to withdraw
     */
    function withdrawAdminFees(address recipient, uint256 amount) external nonReentrant onlyRole(DEFAULT_ADMIN_ROLE) {
        if (recipient == address(0)) revert InvalidAddress();
        if (amount > _totalAdminFeeBalance) revert ParameterOutOfBounds();

        /* Update admin fees balance */
        _totalAdminFeeBalance -= amount;

        /* Transfer cash from vault to recipient */
        _currencyToken.safeTransfer(recipient, amount);

        emit AdminFeesWithdrawn(recipient, amount);
    }

    /******************************************************/
    /* ERC165 interface */
    /******************************************************/

    /**
     * @inheritdoc IERC165
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(AccessControlUpgradeable, ERC165)
        returns (bool)
    {
        return
            interfaceId == type(IAccessControlUpgradeable).interfaceId ||
            interfaceId == type(IERC721Receiver).interfaceId ||
            interfaceId == type(ILoanReceiver).interfaceId ||
            interfaceId == type(KeeperCompatibleInterface).interfaceId ||
            super.supportsInterface(interfaceId);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";
import "../utils/ContextUpgradeable.sol";
import "../utils/StringsUpgradeable.sol";
import "../utils/introspection/ERC165Upgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

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

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        StringsUpgradeable.toHexString(uint160(account), 20),
                        " is missing role ",
                        StringsUpgradeable.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

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

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

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

        _revokeRole(role, account);
    }

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

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

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }

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

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

pragma solidity ^0.8.0;

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

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

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

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

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

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

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

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

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

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

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

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

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

    uint256 private _status;

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

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _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;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

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

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

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

    /**
     * @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 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

// 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
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Multicall.sol)

pragma solidity ^0.8.0;

import "./Address.sol";

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
abstract contract Multicall {
    /**
     * @dev Receives and executes a batch of function calls on this contract.
     */
    function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            results[i] = Address.functionDelegateCall(address(this), data[i]);
        }
        return results;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

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

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

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

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.8.4;

import "./PRBMath.sol";

/// @title PRBMathUD60x18
/// @author Paul Razvan Berg
/// @notice Smart contract library for advanced fixed-point math that works with uint256 numbers considered to have 18
/// trailing decimals. We call this number representation unsigned 60.18-decimal fixed-point, since there can be up to 60
/// digits in the integer part and up to 18 decimals in the fractional part. The numbers are bound by the minimum and the
/// maximum values permitted by the Solidity type uint256.
library PRBMathUD60x18 {
    /// @dev Half the SCALE number.
    uint256 internal constant HALF_SCALE = 5e17;

    /// @dev log2(e) as an unsigned 60.18-decimal fixed-point number.
    uint256 internal constant LOG2_E = 1_442695040888963407;

    /// @dev The maximum value an unsigned 60.18-decimal fixed-point number can have.
    uint256 internal constant MAX_UD60x18 =
        115792089237316195423570985008687907853269984665640564039457_584007913129639935;

    /// @dev The maximum whole value an unsigned 60.18-decimal fixed-point number can have.
    uint256 internal constant MAX_WHOLE_UD60x18 =
        115792089237316195423570985008687907853269984665640564039457_000000000000000000;

    /// @dev How many trailing decimals can be represented.
    uint256 internal constant SCALE = 1e18;

    /// @notice Calculates the arithmetic average of x and y, rounding down.
    /// @param x The first operand as an unsigned 60.18-decimal fixed-point number.
    /// @param y The second operand as an unsigned 60.18-decimal fixed-point number.
    /// @return result The arithmetic average as an unsigned 60.18-decimal fixed-point number.
    function avg(uint256 x, uint256 y) internal pure returns (uint256 result) {
        // The operations can never overflow.
        unchecked {
            // The last operand checks if both x and y are odd and if that is the case, we add 1 to the result. We need
            // to do this because if both numbers are odd, the 0.5 remainder gets truncated twice.
            result = (x >> 1) + (y >> 1) + (x & y & 1);
        }
    }

    /// @notice Yields the least unsigned 60.18 decimal fixed-point number greater than or equal to x.
    ///
    /// @dev Optimized for fractional value inputs, because for every whole value there are (1e18 - 1) fractional counterparts.
    /// See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions.
    ///
    /// Requirements:
    /// - x must be less than or equal to MAX_WHOLE_UD60x18.
    ///
    /// @param x The unsigned 60.18-decimal fixed-point number to ceil.
    /// @param result The least integer greater than or equal to x, as an unsigned 60.18-decimal fixed-point number.
    function ceil(uint256 x) internal pure returns (uint256 result) {
        if (x > MAX_WHOLE_UD60x18) {
            revert PRBMathUD60x18__CeilOverflow(x);
        }
        assembly {
            // Equivalent to "x % SCALE" but faster.
            let remainder := mod(x, SCALE)

            // Equivalent to "SCALE - remainder" but faster.
            let delta := sub(SCALE, remainder)

            // Equivalent to "x + delta * (remainder > 0 ? 1 : 0)" but faster.
            result := add(x, mul(delta, gt(remainder, 0)))
        }
    }

    /// @notice Divides two unsigned 60.18-decimal fixed-point numbers, returning a new unsigned 60.18-decimal fixed-point number.
    ///
    /// @dev Uses mulDiv to enable overflow-safe multiplication and division.
    ///
    /// Requirements:
    /// - The denominator cannot be zero.
    ///
    /// @param x The numerator as an unsigned 60.18-decimal fixed-point number.
    /// @param y The denominator as an unsigned 60.18-decimal fixed-point number.
    /// @param result The quotient as an unsigned 60.18-decimal fixed-point number.
    function div(uint256 x, uint256 y) internal pure returns (uint256 result) {
        result = PRBMath.mulDiv(x, SCALE, y);
    }

    /// @notice Returns Euler's number as an unsigned 60.18-decimal fixed-point number.
    /// @dev See https://en.wikipedia.org/wiki/E_(mathematical_constant).
    function e() internal pure returns (uint256 result) {
        result = 2_718281828459045235;
    }

    /// @notice Calculates the natural exponent of x.
    ///
    /// @dev Based on the insight that e^x = 2^(x * log2(e)).
    ///
    /// Requirements:
    /// - All from "log2".
    /// - x must be less than 133.084258667509499441.
    ///
    /// @param x The exponent as an unsigned 60.18-decimal fixed-point number.
    /// @return result The result as an unsigned 60.18-decimal fixed-point number.
    function exp(uint256 x) internal pure returns (uint256 result) {
        // Without this check, the value passed to "exp2" would be greater than 192.
        if (x >= 133_084258667509499441) {
            revert PRBMathUD60x18__ExpInputTooBig(x);
        }

        // Do the fixed-point multiplication inline to save gas.
        unchecked {
            uint256 doubleScaleProduct = x * LOG2_E;
            result = exp2((doubleScaleProduct + HALF_SCALE) / SCALE);
        }
    }

    /// @notice Calculates the binary exponent of x using the binary fraction method.
    ///
    /// @dev See https://ethereum.stackexchange.com/q/79903/24693.
    ///
    /// Requirements:
    /// - x must be 192 or less.
    /// - The result must fit within MAX_UD60x18.
    ///
    /// @param x The exponent as an unsigned 60.18-decimal fixed-point number.
    /// @return result The result as an unsigned 60.18-decimal fixed-point number.
    function exp2(uint256 x) internal pure returns (uint256 result) {
        // 2^192 doesn't fit within the 192.64-bit format used internally in this function.
        if (x >= 192e18) {
            revert PRBMathUD60x18__Exp2InputTooBig(x);
        }

        unchecked {
            // Convert x to the 192.64-bit fixed-point format.
            uint256 x192x64 = (x << 64) / SCALE;

            // Pass x to the PRBMath.exp2 function, which uses the 192.64-bit fixed-point number representation.
            result = PRBMath.exp2(x192x64);
        }
    }

    /// @notice Yields the greatest unsigned 60.18 decimal fixed-point number less than or equal to x.
    /// @dev Optimized for fractional value inputs, because for every whole value there are (1e18 - 1) fractional counterparts.
    /// See https://en.wikipedia.org/wiki/Floor_and_ceiling_functions.
    /// @param x The unsigned 60.18-decimal fixed-point number to floor.
    /// @param result The greatest integer less than or equal to x, as an unsigned 60.18-decimal fixed-point number.
    function floor(uint256 x) internal pure returns (uint256 result) {
        assembly {
            // Equivalent to "x % SCALE" but faster.
            let remainder := mod(x, SCALE)

            // Equivalent to "x - remainder * (remainder > 0 ? 1 : 0)" but faster.
            result := sub(x, mul(remainder, gt(remainder, 0)))
        }
    }

    /// @notice Yields the excess beyond the floor of x.
    /// @dev Based on the odd function definition https://en.wikipedia.org/wiki/Fractional_part.
    /// @param x The unsigned 60.18-decimal fixed-point number to get the fractional part of.
    /// @param result The fractional part of x as an unsigned 60.18-decimal fixed-point number.
    function frac(uint256 x) internal pure returns (uint256 result) {
        assembly {
            result := mod(x, SCALE)
        }
    }

    /// @notice Converts a number from basic integer form to unsigned 60.18-decimal fixed-point representation.
    ///
    /// @dev Requirements:
    /// - x must be less than or equal to MAX_UD60x18 divided by SCALE.
    ///
    /// @param x The basic integer to convert.
    /// @param result The same number in unsigned 60.18-decimal fixed-point representation.
    function fromUint(uint256 x) internal pure returns (uint256 result) {
        unchecked {
            if (x > MAX_UD60x18 / SCALE) {
                revert PRBMathUD60x18__FromUintOverflow(x);
            }
            result = x * SCALE;
        }
    }

    /// @notice Calculates geometric mean of x and y, i.e. sqrt(x * y), rounding down.
    ///
    /// @dev Requirements:
    /// - x * y must fit within MAX_UD60x18, lest it overflows.
    ///
    /// @param x The first operand as an unsigned 60.18-decimal fixed-point number.
    /// @param y The second operand as an unsigned 60.18-decimal fixed-point number.
    /// @return result The result as an unsigned 60.18-decimal fixed-point number.
    function gm(uint256 x, uint256 y) internal pure returns (uint256 result) {
        if (x == 0) {
            return 0;
        }

        unchecked {
            // Checking for overflow this way is faster than letting Solidity do it.
            uint256 xy = x * y;
            if (xy / x != y) {
                revert PRBMathUD60x18__GmOverflow(x, y);
            }

            // We don't need to multiply by the SCALE here because the x*y product had already picked up a factor of SCALE
            // during multiplication. See the comments within the "sqrt" function.
            result = PRBMath.sqrt(xy);
        }
    }

    /// @notice Calculates 1 / x, rounding toward zero.
    ///
    /// @dev Requirements:
    /// - x cannot be zero.
    ///
    /// @param x The unsigned 60.18-decimal fixed-point number for which to calculate the inverse.
    /// @return result The inverse as an unsigned 60.18-decimal fixed-point number.
    function inv(uint256 x) internal pure returns (uint256 result) {
        unchecked {
            // 1e36 is SCALE * SCALE.
            result = 1e36 / x;
        }
    }

    /// @notice Calculates the natural logarithm of x.
    ///
    /// @dev Based on the insight that ln(x) = log2(x) / log2(e).
    ///
    /// Requirements:
    /// - All from "log2".
    ///
    /// Caveats:
    /// - All from "log2".
    /// - This doesn't return exactly 1 for 2.718281828459045235, for that we would need more fine-grained precision.
    ///
    /// @param x The unsigned 60.18-decimal fixed-point number for which to calculate the natural logarithm.
    /// @return result The natural logarithm as an unsigned 60.18-decimal fixed-point number.
    function ln(uint256 x) internal pure returns (uint256 result) {
        // Do the fixed-point multiplication inline to save gas. This is overflow-safe because the maximum value that log2(x)
        // can return is 196205294292027477728.
        unchecked {
            result = (log2(x) * SCALE) / LOG2_E;
        }
    }

    /// @notice Calculates the common logarithm of x.
    ///
    /// @dev First checks if x is an exact power of ten and it stops if yes. If it's not, calculates the common
    /// logarithm based on the insight that log10(x) = log2(x) / log2(10).
    ///
    /// Requirements:
    /// - All from "log2".
    ///
    /// Caveats:
    /// - All from "log2".
    ///
    /// @param x The unsigned 60.18-decimal fixed-point number for which to calculate the common logarithm.
    /// @return result The common logarithm as an unsigned 60.18-decimal fixed-point number.
    function log10(uint256 x) internal pure returns (uint256 result) {
        if (x < SCALE) {
            revert PRBMathUD60x18__LogInputTooSmall(x);
        }

        // Note that the "mul" in this block is the assembly multiplication operation, not the "mul" function defined
        // in this contract.
        // prettier-ignore
        assembly {
            switch x
            case 1 { result := mul(SCALE, sub(0, 18)) }
            case 10 { result := mul(SCALE, sub(1, 18)) }
            case 100 { result := mul(SCALE, sub(2, 18)) }
            case 1000 { result := mul(SCALE, sub(3, 18)) }
            case 10000 { result := mul(SCALE, sub(4, 18)) }
            case 100000 { result := mul(SCALE, sub(5, 18)) }
            case 1000000 { result := mul(SCALE, sub(6, 18)) }
            case 10000000 { result := mul(SCALE, sub(7, 18)) }
            case 100000000 { result := mul(SCALE, sub(8, 18)) }
            case 1000000000 { result := mul(SCALE, sub(9, 18)) }
            case 10000000000 { result := mul(SCALE, sub(10, 18)) }
            case 100000000000 { result := mul(SCALE, sub(11, 18)) }
            case 1000000000000 { result := mul(SCALE, sub(12, 18)) }
            case 10000000000000 { result := mul(SCALE, sub(13, 18)) }
            case 100000000000000 { result := mul(SCALE, sub(14, 18)) }
            case 1000000000000000 { result := mul(SCALE, sub(15, 18)) }
            case 10000000000000000 { result := mul(SCALE, sub(16, 18)) }
            case 100000000000000000 { result := mul(SCALE, sub(17, 18)) }
            case 1000000000000000000 { result := 0 }
            case 10000000000000000000 { result := SCALE }
            case 100000000000000000000 { result := mul(SCALE, 2) }
            case 1000000000000000000000 { result := mul(SCALE, 3) }
            case 10000000000000000000000 { result := mul(SCALE, 4) }
            case 100000000000000000000000 { result := mul(SCALE, 5) }
            case 1000000000000000000000000 { result := mul(SCALE, 6) }
            case 10000000000000000000000000 { result := mul(SCALE, 7) }
            case 100000000000000000000000000 { result := mul(SCALE, 8) }
            case 1000000000000000000000000000 { result := mul(SCALE, 9) }
            case 10000000000000000000000000000 { result := mul(SCALE, 10) }
            case 100000000000000000000000000000 { result := mul(SCALE, 11) }
            case 1000000000000000000000000000000 { result := mul(SCALE, 12) }
            case 10000000000000000000000000000000 { result := mul(SCALE, 13) }
            case 100000000000000000000000000000000 { result := mul(SCALE, 14) }
            case 1000000000000000000000000000000000 { result := mul(SCALE, 15) }
            case 10000000000000000000000000000000000 { result := mul(SCALE, 16) }
            case 100000000000000000000000000000000000 { result := mul(SCALE, 17) }
            case 1000000000000000000000000000000000000 { result := mul(SCALE, 18) }
            case 10000000000000000000000000000000000000 { result := mul(SCALE, 19) }
            case 100000000000000000000000000000000000000 { result := mul(SCALE, 20) }
            case 1000000000000000000000000000000000000000 { result := mul(SCALE, 21) }
            case 10000000000000000000000000000000000000000 { result := mul(SCALE, 22) }
            case 100000000000000000000000000000000000000000 { result := mul(SCALE, 23) }
            case 1000000000000000000000000000000000000000000 { result := mul(SCALE, 24) }
            case 10000000000000000000000000000000000000000000 { result := mul(SCALE, 25) }
            case 100000000000000000000000000000000000000000000 { result := mul(SCALE, 26) }
            case 1000000000000000000000000000000000000000000000 { result := mul(SCALE, 27) }
            case 10000000000000000000000000000000000000000000000 { result := mul(SCALE, 28) }
            case 100000000000000000000000000000000000000000000000 { result := mul(SCALE, 29) }
            case 1000000000000000000000000000000000000000000000000 { result := mul(SCALE, 30) }
            case 10000000000000000000000000000000000000000000000000 { result := mul(SCALE, 31) }
            case 100000000000000000000000000000000000000000000000000 { result := mul(SCALE, 32) }
            case 1000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 33) }
            case 10000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 34) }
            case 100000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 35) }
            case 1000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 36) }
            case 10000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 37) }
            case 100000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 38) }
            case 1000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 39) }
            case 10000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 40) }
            case 100000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 41) }
            case 1000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 42) }
            case 10000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 43) }
            case 100000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 44) }
            case 1000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 45) }
            case 10000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 46) }
            case 100000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 47) }
            case 1000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 48) }
            case 10000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 49) }
            case 100000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 50) }
            case 1000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 51) }
            case 10000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 52) }
            case 100000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 53) }
            case 1000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 54) }
            case 10000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 55) }
            case 100000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 56) }
            case 1000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 57) }
            case 10000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 58) }
            case 100000000000000000000000000000000000000000000000000000000000000000000000000000 { result := mul(SCALE, 59) }
            default {
                result := MAX_UD60x18
            }
        }

        if (result == MAX_UD60x18) {
            // Do the fixed-point division inline to save gas. The denominator is log2(10).
            unchecked {
                result = (log2(x) * SCALE) / 3_321928094887362347;
            }
        }
    }

    /// @notice Calculates the binary logarithm of x.
    ///
    /// @dev Based on the iterative approximation algorithm.
    /// https://en.wikipedia.org/wiki/Binary_logarithm#Iterative_approximation
    ///
    /// Requirements:
    /// - x must be greater than or equal to SCALE, otherwise the result would be negative.
    ///
    /// Caveats:
    /// - The results are nor perfectly accurate to the last decimal, due to the lossy precision of the iterative approximation.
    ///
    /// @param x The unsigned 60.18-decimal fixed-point number for which to calculate the binary logarithm.
    /// @return result The binary logarithm as an unsigned 60.18-decimal fixed-point number.
    function log2(uint256 x) internal pure returns (uint256 result) {
        if (x < SCALE) {
            revert PRBMathUD60x18__LogInputTooSmall(x);
        }
        unchecked {
            // Calculate the integer part of the logarithm and add it to the result and finally calculate y = x * 2^(-n).
            uint256 n = PRBMath.mostSignificantBit(x / SCALE);

            // The integer part of the logarithm as an unsigned 60.18-decimal fixed-point number. The operation can't overflow
            // because n is maximum 255 and SCALE is 1e18.
            result = n * SCALE;

            // This is y = x * 2^(-n).
            uint256 y = x >> n;

            // If y = 1, the fractional part is zero.
            if (y == SCALE) {
                return result;
            }

            // Calculate the fractional part via the iterative approximation.
            // The "delta >>= 1" part is equivalent to "delta /= 2", but shifting bits is faster.
            for (uint256 delta = HALF_SCALE; delta > 0; delta >>= 1) {
                y = (y * y) / SCALE;

                // Is y^2 > 2 and so in the range [2,4)?
                if (y >= 2 * SCALE) {
                    // Add the 2^(-m) factor to the logarithm.
                    result += delta;

                    // Corresponds to z/2 on Wikipedia.
                    y >>= 1;
                }
            }
        }
    }

    /// @notice Multiplies two unsigned 60.18-decimal fixed-point numbers together, returning a new unsigned 60.18-decimal
    /// fixed-point number.
    /// @dev See the documentation for the "PRBMath.mulDivFixedPoint" function.
    /// @param x The multiplicand as an unsigned 60.18-decimal fixed-point number.
    /// @param y The multiplier as an unsigned 60.18-decimal fixed-point number.
    /// @return result The product as an unsigned 60.18-decimal fixed-point number.
    function mul(uint256 x, uint256 y) internal pure returns (uint256 result) {
        result = PRBMath.mulDivFixedPoint(x, y);
    }

    /// @notice Returns PI as an unsigned 60.18-decimal fixed-point number.
    function pi() internal pure returns (uint256 result) {
        result = 3_141592653589793238;
    }

    /// @notice Raises x to the power of y.
    ///
    /// @dev Based on the insight that x^y = 2^(log2(x) * y).
    ///
    /// Requirements:
    /// - All from "exp2", "log2" and "mul".
    ///
    /// Caveats:
    /// - All from "exp2", "log2" and "mul".
    /// - Assumes 0^0 is 1.
    ///
    /// @param x Number to raise to given power y, as an unsigned 60.18-decimal fixed-point number.
    /// @param y Exponent to raise x to, as an unsigned 60.18-decimal fixed-point number.
    /// @return result x raised to power y, as an unsigned 60.18-decimal fixed-point number.
    function pow(uint256 x, uint256 y) internal pure returns (uint256 result) {
        if (x == 0) {
            result = y == 0 ? SCALE : uint256(0);
        } else {
            result = exp2(mul(log2(x), y));
        }
    }

    /// @notice Raises x (unsigned 60.18-decimal fixed-point number) to the power of y (basic unsigned integer) using the
    /// famous algorithm "exponentiation by squaring".
    ///
    /// @dev See https://en.wikipedia.org/wiki/Exponentiation_by_squaring
    ///
    /// Requirements:
    /// - The result must fit within MAX_UD60x18.
    ///
    /// Caveats:
    /// - All from "mul".
    /// - Assumes 0^0 is 1.
    ///
    /// @param x The base as an unsigned 60.18-decimal fixed-point number.
    /// @param y The exponent as an uint256.
    /// @return result The result as an unsigned 60.18-decimal fixed-point number.
    function powu(uint256 x, uint256 y) internal pure returns (uint256 result) {
        // Calculate the first iteration of the loop in advance.
        result = y & 1 > 0 ? x : SCALE;

        // Equivalent to "for(y /= 2; y > 0; y /= 2)" but faster.
        for (y >>= 1; y > 0; y >>= 1) {
            x = PRBMath.mulDivFixedPoint(x, x);

            // Equivalent to "y % 2 == 1" but faster.
            if (y & 1 > 0) {
                result = PRBMath.mulDivFixedPoint(result, x);
            }
        }
    }

    /// @notice Returns 1 as an unsigned 60.18-decimal fixed-point number.
    function scale() internal pure returns (uint256 result) {
        result = SCALE;
    }

    /// @notice Calculates the square root of x, rounding down.
    /// @dev Uses the Babylonian method https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method.
    ///
    /// Requirements:
    /// - x must be less than MAX_UD60x18 / SCALE.
    ///
    /// @param x The unsigned 60.18-decimal fixed-point number for which to calculate the square root.
    /// @return result The result as an unsigned 60.18-decimal fixed-point .
    function sqrt(uint256 x) internal pure returns (uint256 result) {
        unchecked {
            if (x > MAX_UD60x18 / SCALE) {
                revert PRBMathUD60x18__SqrtOverflow(x);
            }
            // Multiply x by the SCALE to account for the factor of SCALE that is picked up when multiplying two unsigned
            // 60.18-decimal fixed-point numbers together (in this case, those two numbers are both the square root).
            result = PRBMath.sqrt(x * SCALE);
        }
    }

    /// @notice Converts a unsigned 60.18-decimal fixed-point number to basic integer form, rounding down in the process.
    /// @param x The unsigned 60.18-decimal fixed-point number to convert.
    /// @return result The same number in basic integer form.
    function toUint(uint256 x) internal pure returns (uint256 result) {
        unchecked {
            result = x / SCALE;
        }
    }
}

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

interface KeeperCompatibleInterface {
  /**
   * @notice method that is simulated by the keepers to see if any work actually
   * needs to be performed. This method does does not actually need to be
   * executable, and since it is only ever simulated it can consume lots of gas.
   * @dev To ensure that it is never called, you may want to add the
   * cannotExecute modifier from KeeperBase to your implementation of this
   * method.
   * @param checkData specified in the upkeep registration so it is always the
   * same for a registered upkeep. This can easily be broken down into specific
   * arguments using `abi.decode`, so multiple upkeeps can be registered on the
   * same contract and easily differentiated by the contract.
   * @return upkeepNeeded boolean to indicate whether the keeper should call
   * performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with, if
   * upkeep is needed. If you would like to encode data to decode later, try
   * `abi.encode`.
   */
  function checkUpkeep(bytes calldata checkData) external returns (bool upkeepNeeded, bytes memory performData);

  /**
   * @notice method that is actually executed by the keepers, via the registry.
   * The data returned by the checkUpkeep simulation will be passed into
   * this method to actually be executed.
   * @dev The input to this method should not be trusted, and the caller of the
   * method should not even be restricted to any single registry. Anyone should
   * be able call it, and the input should be validated, there is no guarantee
   * that the data passed in is the performData returned from checkUpkeep. This
   * could happen due to malicious keepers, racing keepers, or simply a state
   * change while the performUpkeep transaction is waiting for confirmation.
   * Always validate the data passed in.
   * @param performData is the data which was passed back from the checkData
   * simulation. If it is encoded, it can easily be decoded into other types by
   * calling `abi.decode`. This data should not be trusted, and should be
   * validated against the contract's current state.
   */
  function performUpkeep(bytes calldata performData) external;
}

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

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

import "./ILoanPriceOracle.sol";
import "./INoteAdapter.sol";
import "./ILoanReceiver.sol";

/**
 * @title Interface to a Vault
 */
interface IVault is ILoanReceiver {
    /**************************************************************************/
    /* Enums */
    /**************************************************************************/

    /**
     * @notice Tranche identifier
     */
    enum TrancheId {
        Senior,
        Junior
    }

    /**************************************************************************/
    /* Events */
    /**************************************************************************/

    /**
     * @notice Emitted when currency is deposited
     * @param account Depositing account
     * @param trancheId Tranche
     * @param amount Amount of currency tokens
     * @param shares Amount of LP tokens minted
     */
    event Deposited(address indexed account, TrancheId indexed trancheId, uint256 amount, uint256 shares);

    /**
     * @notice Emitted when a note is purchased
     * @param account Selling account
     * @param noteToken Note token contract
     * @param noteTokenId Note token ID
     * @param loanId Loan ID
     * @param purchasePrice Purchase price in currency tokens
     * @param trancheContributions Tranche contributions in currency tokens
     */
    event NotePurchased(
        address indexed account,
        address indexed noteToken,
        uint256 noteTokenId,
        uint256 indexed loanId,
        uint256 purchasePrice,
        uint256[2] trancheContributions
    );

    /**
     * @notice Emitted when LP tokens are redeemed
     * @param account Redeeming account
     * @param trancheId Tranche
     * @param shares Amount of LP tokens burned
     * @param amount Amount of currency tokens
     */
    event Redeemed(address indexed account, TrancheId indexed trancheId, uint256 shares, uint256 amount);

    /**
     * @notice Emitted when redeemed currency tokens are withdrawn
     * @param account Withdrawing account
     * @param trancheId Tranche
     * @param amount Amount of currency tokens withdrawn
     */
    event Withdrawn(address indexed account, TrancheId indexed trancheId, uint256 amount);

    /**
     * @notice Emitted when liquidated loan collateral is withdrawn
     * @param noteToken Note token contract
     * @param loanId Loan ID
     * @param collateralToken Collateral token contract
     * @param collateralTokenId Collateral token ID
     * @param collateralLiquidator Collateral liquidator contract
     */
    event CollateralWithdrawn(
        address indexed noteToken,
        uint256 indexed loanId,
        address collateralToken,
        uint256 collateralTokenId,
        address collateralLiquidator
    );

    /**
     * @notice Emitted when loan is repaid
     * @param noteToken Note token contract
     * @param loanId Loan ID
     * @param adminFee Admin fee in currency tokens
     * @param trancheReturns Tranches returns in currency tokens
     */
    event LoanRepaid(address indexed noteToken, uint256 indexed loanId, uint256 adminFee, uint256[2] trancheReturns);

    /**
     * @notice Emitted when loan is liquidated
     * @param noteToken Note token contract
     * @param loanId Loan ID
     * @param trancheLosses Tranche losses in currency tokens
     */
    event LoanLiquidated(address indexed noteToken, uint256 indexed loanId, uint256[2] trancheLosses);

    /**
     * @notice Emitted when collateral is liquidated
     * @param noteToken Note token contract
     * @param loanId Loan ID
     * @param trancheReturns Tranches returns in currency tokens
     */
    event CollateralLiquidated(address indexed noteToken, uint256 indexed loanId, uint256[2] trancheReturns);

    /**************************************************************************/
    /* Getters */
    /**************************************************************************/

    /**
     * @notice Get vault name
     * @return Vault name
     */
    function name() external view returns (string memory);

    /**
     * @notice Get currency token
     * @return Currency token contract
     */
    function currencyToken() external view returns (IERC20);

    /**
     * @notice Get LP token
     * @param trancheId Tranche
     * @return LP token contract
     */
    function lpToken(TrancheId trancheId) external view returns (IERC20);

    /**
     * @notice Get loan price oracle
     * @return Loan price oracle contract
     */
    function loanPriceOracle() external view returns (ILoanPriceOracle);

    /**
     * @notice Get note adapter contract
     * @param noteToken Note token contract
     * @return Note adapter contract
     */
    function noteAdapters(address noteToken) external view returns (INoteAdapter);

    /**
     * @notice Get list of supported note tokens
     * @return List of note token addresses
     */
    function supportedNoteTokens() external view returns (address[] memory);

    /**
     * @notice Get share price
     * @param trancheId Tranche
     * @return Share price in UD60x18
     */
    function sharePrice(TrancheId trancheId) external view returns (uint256);

    /**
     * @notice Get redemption share price
     * @param trancheId Tranche
     * @return Redemption share price in UD60x18
     */
    function redemptionSharePrice(TrancheId trancheId) external view returns (uint256);

    /**
     * @notice Get utilization
     * @return Utilization in UD60x18, between 0 to 1
     */
    function utilization() external view returns (uint256);

    /**
     * @notice Get utilization with added loan balanace
     * @param additionalLoanBalance Additional loan balance in currency tokens
     * @return Utilization in UD60x18, between 0 to 1
     */
    function utilization(uint256 additionalLoanBalance) external view returns (uint256);

    /**************************************************************************/
    /* User API */
    /**************************************************************************/

    /**
     * @notice Deposit currency into a tranche in exchange for LP tokens
     *
     * Emits a {Deposited} event.
     *
     * @param trancheId Tranche
     * @param amount Amount of currency tokens
     */
    function deposit(TrancheId trancheId, uint256 amount) external;

    /**
     * @notice Price a note
     *
     * @param noteToken Note token contract
     * @param noteTokenId Note token ID
     * @return Purchase price in currency tokens
     */
    function priceNote(address noteToken, uint256 noteTokenId) external view returns (uint256);

    /**
     * @notice Sell a note to the vault
     *
     * Emits a {NotePurchased} event.
     *
     * @param noteToken Note token contract
     * @param noteTokenId Note token ID
     * @param minPurchasePrice Minimum purchase price in currency tokens
     * @return Executed purchase price in currency tokens
     */
    function sellNote(
        address noteToken,
        uint256 noteTokenId,
        uint256 minPurchasePrice
    ) external returns (uint256);

    /**
     * @notice Sell a note to the vault and deposit its proceeds into one or
     * more tranches
     *
     * Emits {NotePurchased} and {Deposited} events.
     *
     * Note: the minimum purchase price is the sum of `amounts`.
     *
     * @param noteToken Note token contract
     * @param noteTokenId Note token ID
     * @param minPurchasePrice Minimum purchase price in currency tokens
     * @param allocation Allocation for each tranche as a percentage in UD60x18
     * @return Executed purchase price in currency tokens
     */
    function sellNoteAndDeposit(
        address noteToken,
        uint256 noteTokenId,
        uint256 minPurchasePrice,
        uint256[2] calldata allocation
    ) external returns (uint256);

    /**
     * @notice Redeem LP tokens in exchange for currency tokens. Currency
     * tokens can be withdrawn with the `withdraw()` method, once the
     * redemption is processed.
     *
     * Emits a {Redeemed} event.
     *
     * @param trancheId Tranche
     * @param shares Amount of LP tokens
     */
    function redeem(TrancheId trancheId, uint256 shares) external;

    /**
     * @notice Withdraw redeemed currency tokens
     *
     * Emits a {Withdrawn} event.
     *
     * @param trancheId Tranche
     * @param maxAmount Maximum amount of currency tokens to withdraw
     */
    function withdraw(TrancheId trancheId, uint256 maxAmount) external;

    /**************************************************************************/
    /* Collateral API */
    /**************************************************************************/

    /**
     * @notice Withdraw the collateral of a liquidated loan
     *
     * Emits a {CollateralWithdrawn} event.
     *
     * @param noteToken Note token contract
     * @param loanId Loan ID
     */
    function withdrawCollateral(address noteToken, uint256 loanId) external;

    /**************************************************************************/
    /* Callbacks */
    /**************************************************************************/

    /* See ILoanReceiver */

    /**
     * @notice Callback on collateral liquidated
     *
     * Emits a {CollateralLiquidated} event.
     *
     * @param noteToken Note token contract
     * @param loanId Loan ID
     * @param proceeds Proceeds from collateral liquidation in currency tokens
     */
    function onCollateralLiquidated(
        address noteToken,
        uint256 loanId,
        uint256 proceeds
    ) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.9;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";

/**
 * @title Storage for LPToken, V1
 */
abstract contract LPTokenStorageV1 {
    /**
     * @notice Redemption state for account
     * @param pending Pending redemption amount
     * @param withdrawn Withdrawn redemption amount
     * @param redemptionQueueTarget Target in vault's redemption queue
     */
    struct Redemption {
        uint256 pending;
        uint256 withdrawn;
        uint256 redemptionQueueTarget;
    }

    /**
     * @dev Mapping of account to redemption state
     */
    mapping(address => Redemption) internal _redemptions;
}

/**
 * @title Storage for LPToken, aggregated
 */
abstract contract LPTokenStorage is LPTokenStorageV1 {

}

/**
 * @title Liquidity Provider (LP) Token for Vault Tranches
 */
contract LPToken is Initializable, OwnableUpgradeable, ERC20Upgradeable, LPTokenStorage {
    /**************************************************************************/
    /* Constants */
    /**************************************************************************/

    /**
     * @notice Implementation version
     */
    string public constant IMPLEMENTATION_VERSION = "1.1";

    /**************************************************************************/
    /* Errors */
    /**************************************************************************/

    /**
     * @notice Insufficient balance
     */
    error InsufficientBalance();

    /**
     * @notice Redemption in progress
     */
    error RedemptionInProgress();

    /**
     * @notice Invalid amount
     */
    error InvalidAmount();

    /**************************************************************************/
    /* Constructor */
    /**************************************************************************/

    /**
     * @notice LPToken constructor (for implementation)
     * @custom:oz-upgrades-unsafe-allow constructor
     */
    constructor() initializer {}

    /**
     * @notice LPToken constructor (for proxy)
     * @param name Token name
     * @param symbol Token symbol
     */
    function initialize(string memory name, string memory symbol) external initializer {
        __Ownable_init();
        __ERC20_init(name, symbol);
    }

    /**************************************************************************/
    /* Getters */
    /**************************************************************************/

    /**
     * @notice Get redemption state for account
     * @param account Account
     * @return Redemption state
     */
    function redemptions(address account) external view returns (Redemption memory) {
        return _redemptions[account];
    }

    /**
     * @notice Get amount of redemption available for withdraw for account
     * @param account Account
     * @param processedRedemptionQueue Current value of vault's processed
     * redemption queue
     * @return Amount available for withdraw
     */
    function redemptionAvailable(address account, uint256 processedRedemptionQueue) public view returns (uint256) {
        Redemption storage redemption = _redemptions[account];

        if (redemption.pending == 0) {
            /* No redemption pending */
            return 0;
        } else if (processedRedemptionQueue >= redemption.redemptionQueueTarget + redemption.pending) {
            /* Full redemption available for withdraw */
            return redemption.pending - redemption.withdrawn;
        } else if (processedRedemptionQueue > redemption.redemptionQueueTarget) {
            /* Partial redemption available for withdraw */
            return processedRedemptionQueue - redemption.redemptionQueueTarget - redemption.withdrawn;
        } else {
            /* No redemption available for withdraw */
            return 0;
        }
    }

    /**************************************************************************/
    /* Privileged API */
    /**************************************************************************/

    /**
     * @notice Mint tokens to account
     * @param to Recipient account
     * @param amount Amount of LP tokens
     */
    function mint(address to, uint256 amount) external virtual onlyOwner {
        _mint(to, amount);
    }

    /**
     * @notice Burn tokens from account for redemption
     * @param account Redeeming account
     * @param amount Amount of LP tokens
     * @param currencyAmount Amount of currency tokens
     * @param redemptionQueueTarget Target in vault's redemption queue
     */
    function redeem(
        address account,
        uint256 amount,
        uint256 currencyAmount,
        uint256 redemptionQueueTarget
    ) external onlyOwner {
        Redemption storage redemption = _redemptions[account];

        if (balanceOf(account) < amount) revert InsufficientBalance();
        if (redemption.pending != 0) revert RedemptionInProgress();

        redemption.pending = currencyAmount;
        redemption.withdrawn = 0;
        redemption.redemptionQueueTarget = redemptionQueueTarget;

        _burn(account, amount);
    }

    /**
     * @notice Update account's redemption state for withdraw
     * @param account Redeeming account
     * @param currencyAmount Amount of currency tokens
     * @param processedRedemptionQueue Current value of vault's processed
     * redemption queue
     */
    function withdraw(
        address account,
        uint256 currencyAmount,
        uint256 processedRedemptionQueue
    ) external onlyOwner {
        Redemption storage redemption = _redemptions[account];

        if (redemptionAvailable(account, processedRedemptionQueue) < currencyAmount) revert InvalidAmount();

        if (redemption.withdrawn + currencyAmount == redemption.pending) {
            delete _redemptions[account];
        } else {
            redemption.withdrawn += currencyAmount;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://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 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 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

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

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

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts 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 IERC165Upgradeable {
    /**
     * @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
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://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/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// 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: Unlicense
pragma solidity >=0.8.4;

/// @notice Emitted when the result overflows uint256.
error PRBMath__MulDivFixedPointOverflow(uint256 prod1);

/// @notice Emitted when the result overflows uint256.
error PRBMath__MulDivOverflow(uint256 prod1, uint256 denominator);

/// @notice Emitted when one of the inputs is type(int256).min.
error PRBMath__MulDivSignedInputTooSmall();

/// @notice Emitted when the intermediary absolute result overflows int256.
error PRBMath__MulDivSignedOverflow(uint256 rAbs);

/// @notice Emitted when the input is MIN_SD59x18.
error PRBMathSD59x18__AbsInputTooSmall();

/// @notice Emitted when ceiling a number overflows SD59x18.
error PRBMathSD59x18__CeilOverflow(int256 x);

/// @notice Emitted when one of the inputs is MIN_SD59x18.
error PRBMathSD59x18__DivInputTooSmall();

/// @notice Emitted when one of the intermediary unsigned results overflows SD59x18.
error PRBMathSD59x18__DivOverflow(uint256 rAbs);

/// @notice Emitted when the input is greater than 133.084258667509499441.
error PRBMathSD59x18__ExpInputTooBig(int256 x);

/// @notice Emitted when the input is greater than 192.
error PRBMathSD59x18__Exp2InputTooBig(int256 x);

/// @notice Emitted when flooring a number underflows SD59x18.
error PRBMathSD59x18__FloorUnderflow(int256 x);

/// @notice Emitted when converting a basic integer to the fixed-point format overflows SD59x18.
error PRBMathSD59x18__FromIntOverflow(int256 x);

/// @notice Emitted when converting a basic integer to the fixed-point format underflows SD59x18.
error PRBMathSD59x18__FromIntUnderflow(int256 x);

/// @notice Emitted when the product of the inputs is negative.
error PRBMathSD59x18__GmNegativeProduct(int256 x, int256 y);

/// @notice Emitted when multiplying the inputs overflows SD59x18.
error PRBMathSD59x18__GmOverflow(int256 x, int256 y);

/// @notice Emitted when the input is less than or equal to zero.
error PRBMathSD59x18__LogInputTooSmall(int256 x);

/// @notice Emitted when one of the inputs is MIN_SD59x18.
error PRBMathSD59x18__MulInputTooSmall();

/// @notice Emitted when the intermediary absolute result overflows SD59x18.
error PRBMathSD59x18__MulOverflow(uint256 rAbs);

/// @notice Emitted when the intermediary absolute result overflows SD59x18.
error PRBMathSD59x18__PowuOverflow(uint256 rAbs);

/// @notice Emitted when the input is negative.
error PRBMathSD59x18__SqrtNegativeInput(int256 x);

/// @notice Emitted when the calculating the square root overflows SD59x18.
error PRBMathSD59x18__SqrtOverflow(int256 x);

/// @notice Emitted when addition overflows UD60x18.
error PRBMathUD60x18__AddOverflow(uint256 x, uint256 y);

/// @notice Emitted when ceiling a number overflows UD60x18.
error PRBMathUD60x18__CeilOverflow(uint256 x);

/// @notice Emitted when the input is greater than 133.084258667509499441.
error PRBMathUD60x18__ExpInputTooBig(uint256 x);

/// @notice Emitted when the input is greater than 192.
error PRBMathUD60x18__Exp2InputTooBig(uint256 x);

/// @notice Emitted when converting a basic integer to the fixed-point format format overflows UD60x18.
error PRBMathUD60x18__FromUintOverflow(uint256 x);

/// @notice Emitted when multiplying the inputs overflows UD60x18.
error PRBMathUD60x18__GmOverflow(uint256 x, uint256 y);

/// @notice Emitted when the input is less than 1.
error PRBMathUD60x18__LogInputTooSmall(uint256 x);

/// @notice Emitted when the calculating the square root overflows UD60x18.
error PRBMathUD60x18__SqrtOverflow(uint256 x);

/// @notice Emitted when subtraction underflows UD60x18.
error PRBMathUD60x18__SubUnderflow(uint256 x, uint256 y);

/// @dev Common mathematical functions used in both PRBMathSD59x18 and PRBMathUD60x18. Note that this shared library
/// does not always assume the signed 59.18-decimal fixed-point or the unsigned 60.18-decimal fixed-point
/// representation. When it does not, it is explicitly mentioned in the NatSpec documentation.
library PRBMath {
    /// STRUCTS ///

    struct SD59x18 {
        int256 value;
    }

    struct UD60x18 {
        uint256 value;
    }

    /// STORAGE ///

    /// @dev How many trailing decimals can be represented.
    uint256 internal constant SCALE = 1e18;

    /// @dev Largest power of two divisor of SCALE.
    uint256 internal constant SCALE_LPOTD = 262144;

    /// @dev SCALE inverted mod 2^256.
    uint256 internal constant SCALE_INVERSE =
        78156646155174841979727994598816262306175212592076161876661_508869554232690281;

    /// FUNCTIONS ///

    /// @notice Calculates the binary exponent of x using the binary fraction method.
    /// @dev Has to use 192.64-bit fixed-point numbers.
    /// See https://ethereum.stackexchange.com/a/96594/24693.
    /// @param x The exponent as an unsigned 192.64-bit fixed-point number.
    /// @return result The result as an unsigned 60.18-decimal fixed-point number.
    function exp2(uint256 x) internal pure returns (uint256 result) {
        unchecked {
            // Start from 0.5 in the 192.64-bit fixed-point format.
            result = 0x800000000000000000000000000000000000000000000000;

            // Multiply the result by root(2, 2^-i) when the bit at position i is 1. None of the intermediary results overflows
            // because the initial result is 2^191 and all magic factors are less than 2^65.
            if (x & 0x8000000000000000 > 0) {
                result = (result * 0x16A09E667F3BCC909) >> 64;
            }
            if (x & 0x4000000000000000 > 0) {
                result = (result * 0x1306FE0A31B7152DF) >> 64;
            }
            if (x & 0x2000000000000000 > 0) {
                result = (result * 0x1172B83C7D517ADCE) >> 64;
            }
            if (x & 0x1000000000000000 > 0) {
                result = (result * 0x10B5586CF9890F62A) >> 64;
            }
            if (x & 0x800000000000000 > 0) {
                result = (result * 0x1059B0D31585743AE) >> 64;
            }
            if (x & 0x400000000000000 > 0) {
                result = (result * 0x102C9A3E778060EE7) >> 64;
            }
            if (x & 0x200000000000000 > 0) {
                result = (result * 0x10163DA9FB33356D8) >> 64;
            }
            if (x & 0x100000000000000 > 0) {
                result = (result * 0x100B1AFA5ABCBED61) >> 64;
            }
            if (x & 0x80000000000000 > 0) {
                result = (result * 0x10058C86DA1C09EA2) >> 64;
            }
            if (x & 0x40000000000000 > 0) {
                result = (result * 0x1002C605E2E8CEC50) >> 64;
            }
            if (x & 0x20000000000000 > 0) {
                result = (result * 0x100162F3904051FA1) >> 64;
            }
            if (x & 0x10000000000000 > 0) {
                result = (result * 0x1000B175EFFDC76BA) >> 64;
            }
            if (x & 0x8000000000000 > 0) {
                result = (result * 0x100058BA01FB9F96D) >> 64;
            }
            if (x & 0x4000000000000 > 0) {
                result = (result * 0x10002C5CC37DA9492) >> 64;
            }
            if (x & 0x2000000000000 > 0) {
                result = (result * 0x1000162E525EE0547) >> 64;
            }
            if (x & 0x1000000000000 > 0) {
                result = (result * 0x10000B17255775C04) >> 64;
            }
            if (x & 0x800000000000 > 0) {
                result = (result * 0x1000058B91B5BC9AE) >> 64;
            }
            if (x & 0x400000000000 > 0) {
                result = (result * 0x100002C5C89D5EC6D) >> 64;
            }
            if (x & 0x200000000000 > 0) {
                result = (result * 0x10000162E43F4F831) >> 64;
            }
            if (x & 0x100000000000 > 0) {
                result = (result * 0x100000B1721BCFC9A) >> 64;
            }
            if (x & 0x80000000000 > 0) {
                result = (result * 0x10000058B90CF1E6E) >> 64;
            }
            if (x & 0x40000000000 > 0) {
                result = (result * 0x1000002C5C863B73F) >> 64;
            }
            if (x & 0x20000000000 > 0) {
                result = (result * 0x100000162E430E5A2) >> 64;
            }
            if (x & 0x10000000000 > 0) {
                result = (result * 0x1000000B172183551) >> 64;
            }
            if (x & 0x8000000000 > 0) {
                result = (result * 0x100000058B90C0B49) >> 64;
            }
            if (x & 0x4000000000 > 0) {
                result = (result * 0x10000002C5C8601CC) >> 64;
            }
            if (x & 0x2000000000 > 0) {
                result = (result * 0x1000000162E42FFF0) >> 64;
            }
            if (x & 0x1000000000 > 0) {
                result = (result * 0x10000000B17217FBB) >> 64;
            }
            if (x & 0x800000000 > 0) {
                result = (result * 0x1000000058B90BFCE) >> 64;
            }
            if (x & 0x400000000 > 0) {
                result = (result * 0x100000002C5C85FE3) >> 64;
            }
            if (x & 0x200000000 > 0) {
                result = (result * 0x10000000162E42FF1) >> 64;
            }
            if (x & 0x100000000 > 0) {
                result = (result * 0x100000000B17217F8) >> 64;
            }
            if (x & 0x80000000 > 0) {
                result = (result * 0x10000000058B90BFC) >> 64;
            }
            if (x & 0x40000000 > 0) {
                result = (result * 0x1000000002C5C85FE) >> 64;
            }
            if (x & 0x20000000 > 0) {
                result = (result * 0x100000000162E42FF) >> 64;
            }
            if (x & 0x10000000 > 0) {
                result = (result * 0x1000000000B17217F) >> 64;
            }
            if (x & 0x8000000 > 0) {
                result = (result * 0x100000000058B90C0) >> 64;
            }
            if (x & 0x4000000 > 0) {
                result = (result * 0x10000000002C5C860) >> 64;
            }
            if (x & 0x2000000 > 0) {
                result = (result * 0x1000000000162E430) >> 64;
            }
            if (x & 0x1000000 > 0) {
                result = (result * 0x10000000000B17218) >> 64;
            }
            if (x & 0x800000 > 0) {
                result = (result * 0x1000000000058B90C) >> 64;
            }
            if (x & 0x400000 > 0) {
                result = (result * 0x100000000002C5C86) >> 64;
            }
            if (x & 0x200000 > 0) {
                result = (result * 0x10000000000162E43) >> 64;
            }
            if (x & 0x100000 > 0) {
                result = (result * 0x100000000000B1721) >> 64;
            }
            if (x & 0x80000 > 0) {
                result = (result * 0x10000000000058B91) >> 64;
            }
            if (x & 0x40000 > 0) {
                result = (result * 0x1000000000002C5C8) >> 64;
            }
            if (x & 0x20000 > 0) {
                result = (result * 0x100000000000162E4) >> 64;
            }
            if (x & 0x10000 > 0) {
                result = (result * 0x1000000000000B172) >> 64;
            }
            if (x & 0x8000 > 0) {
                result = (result * 0x100000000000058B9) >> 64;
            }
            if (x & 0x4000 > 0) {
                result = (result * 0x10000000000002C5D) >> 64;
            }
            if (x & 0x2000 > 0) {
                result = (result * 0x1000000000000162E) >> 64;
            }
            if (x & 0x1000 > 0) {
                result = (result * 0x10000000000000B17) >> 64;
            }
            if (x & 0x800 > 0) {
                result = (result * 0x1000000000000058C) >> 64;
            }
            if (x & 0x400 > 0) {
                result = (result * 0x100000000000002C6) >> 64;
            }
            if (x & 0x200 > 0) {
                result = (result * 0x10000000000000163) >> 64;
            }
            if (x & 0x100 > 0) {
                result = (result * 0x100000000000000B1) >> 64;
            }
            if (x & 0x80 > 0) {
                result = (result * 0x10000000000000059) >> 64;
            }
            if (x & 0x40 > 0) {
                result = (result * 0x1000000000000002C) >> 64;
            }
            if (x & 0x20 > 0) {
                result = (result * 0x10000000000000016) >> 64;
            }
            if (x & 0x10 > 0) {
                result = (result * 0x1000000000000000B) >> 64;
            }
            if (x & 0x8 > 0) {
                result = (result * 0x10000000000000006) >> 64;
            }
            if (x & 0x4 > 0) {
                result = (result * 0x10000000000000003) >> 64;
            }
            if (x & 0x2 > 0) {
                result = (result * 0x10000000000000001) >> 64;
            }
            if (x & 0x1 > 0) {
                result = (result * 0x10000000000000001) >> 64;
            }

            // We're doing two things at the same time:
            //
            //   1. Multiply the result by 2^n + 1, where "2^n" is the integer part and the one is added to account for
            //      the fact that we initially set the result to 0.5. This is accomplished by subtracting from 191
            //      rather than 192.
            //   2. Convert the result to the unsigned 60.18-decimal fixed-point format.
            //
            // This works because 2^(191-ip) = 2^ip / 2^191, where "ip" is the integer part "2^n".
            result *= SCALE;
            result >>= (191 - (x >> 64));
        }
    }

    /// @notice Finds the zero-based index of the first one in the binary representation of x.
    /// @dev See the note on msb in the "Find First Set" Wikipedia article https://en.wikipedia.org/wiki/Find_first_set
    /// @param x The uint256 number for which to find the index of the most significant bit.
    /// @return msb The index of the most significant bit as an uint256.
    function mostSignificantBit(uint256 x) internal pure returns (uint256 msb) {
        if (x >= 2**128) {
            x >>= 128;
            msb += 128;
        }
        if (x >= 2**64) {
            x >>= 64;
            msb += 64;
        }
        if (x >= 2**32) {
            x >>= 32;
            msb += 32;
        }
        if (x >= 2**16) {
            x >>= 16;
            msb += 16;
        }
        if (x >= 2**8) {
            x >>= 8;
            msb += 8;
        }
        if (x >= 2**4) {
            x >>= 4;
            msb += 4;
        }
        if (x >= 2**2) {
            x >>= 2;
            msb += 2;
        }
        if (x >= 2**1) {
            // No need to shift x any more.
            msb += 1;
        }
    }

    /// @notice Calculates floor(x*y÷denominator) with full precision.
    ///
    /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv.
    ///
    /// Requirements:
    /// - The denominator cannot be zero.
    /// - The result must fit within uint256.
    ///
    /// Caveats:
    /// - This function does not work with fixed-point numbers.
    ///
    /// @param x The multiplicand as an uint256.
    /// @param y The multiplier as an uint256.
    /// @param denominator The divisor as an uint256.
    /// @return result The result as an uint256.
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
        // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
        // variables such that product = prod1 * 2^256 + prod0.
        uint256 prod0; // Least significant 256 bits of the product
        uint256 prod1; // Most significant 256 bits of the product
        assembly {
            let mm := mulmod(x, y, not(0))
            prod0 := mul(x, y)
            prod1 := sub(sub(mm, prod0), lt(mm, prod0))
        }

        // Handle non-overflow cases, 256 by 256 division.
        if (prod1 == 0) {
            unchecked {
                result = prod0 / denominator;
            }
            return result;
        }

        // Make sure the result is less than 2^256. Also prevents denominator == 0.
        if (prod1 >= denominator) {
            revert PRBMath__MulDivOverflow(prod1, denominator);
        }

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

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

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

        // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
        // See https://cs.stackexchange.com/q/138556/92363.
        unchecked {
            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 lpotdod = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by lpotdod.
                denominator := div(denominator, lpotdod)

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

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

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

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

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

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

    /// @notice Calculates floor(x*y÷1e18) with full precision.
    ///
    /// @dev Variant of "mulDiv" with constant folding, i.e. in which the denominator is always 1e18. Before returning the
    /// final result, we add 1 if (x * y) % SCALE >= HALF_SCALE. Without this, 6.6e-19 would be truncated to 0 instead of
    /// being rounded to 1e-18.  See "Listing 6" and text above it at https://accu.org/index.php/journals/1717.
    ///
    /// Requirements:
    /// - The result must fit within uint256.
    ///
    /// Caveats:
    /// - The body is purposely left uncommented; see the NatSpec comments in "PRBMath.mulDiv" to understand how this works.
    /// - It is assumed that the result can never be type(uint256).max when x and y solve the following two equations:
    ///     1. x * y = type(uint256).max * SCALE
    ///     2. (x * y) % SCALE >= SCALE / 2
    ///
    /// @param x The multiplicand as an unsigned 60.18-decimal fixed-point number.
    /// @param y The multiplier as an unsigned 60.18-decimal fixed-point number.
    /// @return result The result as an unsigned 60.18-decimal fixed-point number.
    function mulDivFixedPoint(uint256 x, uint256 y) internal pure returns (uint256 result) {
        uint256 prod0;
        uint256 prod1;
        assembly {
            let mm := mulmod(x, y, not(0))
            prod0 := mul(x, y)
            prod1 := sub(sub(mm, prod0), lt(mm, prod0))
        }

        if (prod1 >= SCALE) {
            revert PRBMath__MulDivFixedPointOverflow(prod1);
        }

        uint256 remainder;
        uint256 roundUpUnit;
        assembly {
            remainder := mulmod(x, y, SCALE)
            roundUpUnit := gt(remainder, 499999999999999999)
        }

        if (prod1 == 0) {
            unchecked {
                result = (prod0 / SCALE) + roundUpUnit;
                return result;
            }
        }

        assembly {
            result := add(
                mul(
                    or(
                        div(sub(prod0, remainder), SCALE_LPOTD),
                        mul(sub(prod1, gt(remainder, prod0)), add(div(sub(0, SCALE_LPOTD), SCALE_LPOTD), 1))
                    ),
                    SCALE_INVERSE
                ),
                roundUpUnit
            )
        }
    }

    /// @notice Calculates floor(x*y÷denominator) with full precision.
    ///
    /// @dev An extension of "mulDiv" for signed numbers. Works by computing the signs and the absolute values separately.
    ///
    /// Requirements:
    /// - None of the inputs can be type(int256).min.
    /// - The result must fit within int256.
    ///
    /// @param x The multiplicand as an int256.
    /// @param y The multiplier as an int256.
    /// @param denominator The divisor as an int256.
    /// @return result The result as an int256.
    function mulDivSigned(
        int256 x,
        int256 y,
        int256 denominator
    ) internal pure returns (int256 result) {
        if (x == type(int256).min || y == type(int256).min || denominator == type(int256).min) {
            revert PRBMath__MulDivSignedInputTooSmall();
        }

        // Get hold of the absolute values of x, y and the denominator.
        uint256 ax;
        uint256 ay;
        uint256 ad;
        unchecked {
            ax = x < 0 ? uint256(-x) : uint256(x);
            ay = y < 0 ? uint256(-y) : uint256(y);
            ad = denominator < 0 ? uint256(-denominator) : uint256(denominator);
        }

        // Compute the absolute value of (x*y)÷denominator. The result must fit within int256.
        uint256 rAbs = mulDiv(ax, ay, ad);
        if (rAbs > uint256(type(int256).max)) {
            revert PRBMath__MulDivSignedOverflow(rAbs);
        }

        // Get the signs of x, y and the denominator.
        uint256 sx;
        uint256 sy;
        uint256 sd;
        assembly {
            sx := sgt(x, sub(0, 1))
            sy := sgt(y, sub(0, 1))
            sd := sgt(denominator, sub(0, 1))
        }

        // XOR over sx, sy and sd. This is checking whether there are one or three negative signs in the inputs.
        // If yes, the result should be negative.
        result = sx ^ sy ^ sd == 0 ? -int256(rAbs) : int256(rAbs);
    }

    /// @notice Calculates the square root of x, rounding down.
    /// @dev Uses the Babylonian method https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method.
    ///
    /// Caveats:
    /// - This function does not work with fixed-point numbers.
    ///
    /// @param x The uint256 number for which to calculate the square root.
    /// @return result The result as an uint256.
    function sqrt(uint256 x) internal pure returns (uint256 result) {
        if (x == 0) {
            return 0;
        }

        // Set the initial guess to the least power of two that is greater than or equal to sqrt(x).
        uint256 xAux = uint256(x);
        result = 1;
        if (xAux >= 0x100000000000000000000000000000000) {
            xAux >>= 128;
            result <<= 64;
        }
        if (xAux >= 0x10000000000000000) {
            xAux >>= 64;
            result <<= 32;
        }
        if (xAux >= 0x100000000) {
            xAux >>= 32;
            result <<= 16;
        }
        if (xAux >= 0x10000) {
            xAux >>= 16;
            result <<= 8;
        }
        if (xAux >= 0x100) {
            xAux >>= 8;
            result <<= 4;
        }
        if (xAux >= 0x10) {
            xAux >>= 4;
            result <<= 2;
        }
        if (xAux >= 0x8) {
            result <<= 1;
        }

        // The operations can never overflow because the result is max 2^127 when it enters this block.
        unchecked {
            result = (result + x / result) >> 1;
            result = (result + x / result) >> 1;
            result = (result + x / result) >> 1;
            result = (result + x / result) >> 1;
            result = (result + x / result) >> 1;
            result = (result + x / result) >> 1;
            result = (result + x / result) >> 1; // Seven iterations should be enough
            uint256 roundedDownResult = x / result;
            return result >= roundedDownResult ? roundedDownResult : result;
        }
    }
}

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

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

/**
 * @title Interface to a LoanPriceOracle
 */
interface ILoanPriceOracle {
    /**************************************************************************/
    /* Error codes */
    /**************************************************************************/

    /**
     * @notice Unsupported collateral token contract
     */
    error UnsupportedCollateral();
    /**
     * @notice Insufficient time remaining for loan
     */
    error InsufficientTimeRemaining();
    /**
     * @notice Loan parameter out of bounds
     * @param index Index of out of bound parameter
     */
    error ParameterOutOfBounds(uint256 index);

    /**************************************************************************/
    /* Getters */
    /**************************************************************************/

    /**
     * @notice Get currency token used for pricing
     * @return Currency token contract
     */
    function currencyToken() external view returns (IERC20);

    /**************************************************************************/
    /* Primary API */
    /**************************************************************************/

    /**
     * @notice Price a loan collateralized by the specified token contract and
     * token id
     * @param collateralToken Collateral token contract
     * @param collateralTokenId Collateral token ID
     * @param principal Principal value of loan, in UD60x18
     * @param repayment Repayment value of loan, in UD60x18
     * @param duration Duration of loan, in seconds
     * @param maturity Maturity of loan, in seconds since Unix epoch
     * @param utilization Vault fund utilization, in UD60x18
     * @return Price of loan, in UD60x18
     */
    function priceLoan(
        address collateralToken,
        uint256 collateralTokenId,
        uint256 principal,
        uint256 repayment,
        uint256 duration,
        uint256 maturity,
        uint256 utilization
    ) external view returns (uint256);

    /**
     * @notice Price a loan's repayment, collateralized by the specified token
     * contract and token id
     * @param collateralToken Collateral token contract
     * @param collateralTokenId Collateral token ID
     * @param principal Principal value of loan, in UD60x18
     * @param duration Duration of loan, in seconds
     * @param utilization Vault fund utilization, in UD60x18
     * @return Repayment price of loan, in UD60x18
     */
    function priceLoanRepayment(
        address collateralToken,
        uint256 collateralTokenId,
        uint256 principal,
        uint256 duration,
        uint256 utilization
    ) external view returns (uint256);
}

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

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/**
 * @title Interface to a note adapter, a generic interface to a lending
 * platform
 */
interface INoteAdapter {
    /**************************************************************************/
    /* Structures */
    /**************************************************************************/

    /**
     * @notice Asset information
     * @param token Token contract
     * @param tokenId Token ID
     */
    struct AssetInfo {
        address token;
        uint256 tokenId;
    }

    /**
     * @notice Loan information
     * @param loanId Loan ID
     * @param borrower Borrower
     * @param principal Principal value
     * @param repayment Repayment value
     * @param maturity Maturity in seconds since Unix epoch
     * @param duration Duration in seconds
     * @param currencyToken Currency token used by loan
     * @param collateralToken Collateral token contract
     * @param collateralTokenId Collateral token ID
     */
    struct LoanInfo {
        uint256 loanId;
        address borrower;
        uint256 principal;
        uint256 repayment;
        uint64 maturity;
        uint64 duration;
        address currencyToken;
        address collateralToken;
        uint256 collateralTokenId;
    }

    /**************************************************************************/
    /* Primary API */
    /**************************************************************************/

    /**
     * @notice Get note adapter name
     * @return Note adapter name
     */
    function name() external view returns (string memory);

    /**
     * @notice Get note token of lending platform
     * @return Note token contract
     */
    function noteToken() external view returns (IERC721);

    /**
     * @notice Check if loan is supported by Vault
     * @param noteTokenId Note token ID
     * @param currencyToken Currency token used by Vault
     * @return True if supported, otherwise false
     */
    function isSupported(uint256 noteTokenId, address currencyToken) external view returns (bool);

    /**
     * @notice Get loan information
     * @param noteTokenId Note token ID
     * @return Loan information
     */
    function getLoanInfo(uint256 noteTokenId) external view returns (LoanInfo memory);

    /**
     * @notice Get loan collateral assets
     * @param noteTokenId Note token ID
     * @return Loan collateral assets
     */
    function getLoanAssets(uint256 noteTokenId) external view returns (AssetInfo[] memory);

    /**
     * @notice Get target and calldata to liquidate loan
     * @param loanId Loan ID
     * @return Target address
     * @return Encoded calldata with selector
     */
    function getLiquidateCalldata(uint256 loanId) external view returns (address, bytes memory);

    /**
     * @notice Get target and calldata to unwrap collateral
     * @param loanId Loan ID
     * @return Target address
     * @return Encoded calldata with selector
     */
    function getUnwrapCalldata(uint256 loanId) external view returns (address, bytes memory);

    /**
     * @notice Check if loan is repaid
     * @param loanId Loan ID
     * @return True if repaid, otherwise false
     */
    function isRepaid(uint256 loanId) external view returns (bool);

    /**
     * @notice Check if loan is liquidated
     * @param loanId Loan ID
     * @return True if liquidated, otherwise false
     */
    function isLiquidated(uint256 loanId) external view returns (bool);

    /**
     * @notice Check if loan is expired
     * @param loanId Loan ID
     * @return True if expired, otherwise false
     */
    function isExpired(uint256 loanId) external view returns (bool);
}

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

/**
 * @title Interface containing callbacks for smart contract loan holders
 * @notice Lending platforms should detect if a lender implements this
 * interface and call it on loan repayment.
 */
interface ILoanReceiver {
    /**
     * @notice Callback on loan repaid
     * @param noteToken Note token contract
     * @param loanId Loan ID
     */
    function onLoanRepaid(address noteToken, uint256 loanId) external;

    /**
     * @notice Callback on loan expired
     * @param noteToken Note token contract
     * @param loanId Loan ID
     */
    function onLoanExpired(address noteToken, uint256 loanId) external;
}

// 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 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

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

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

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

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

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

    /**
     * @dev Spend `amount` form the allowance of `owner` toward `spender`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @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 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

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

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

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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IVault.TrancheId","name":"trancheId","type":"uint8"}],"name":"trancheState","outputs":[{"internalType":"uint256","name":"realizedValue","type":"uint256"},{"internalType":"uint256","name":"estimatedValue","type":"uint256"},{"internalType":"uint256","name":"pendingRedemptions","type":"uint256"},{"internalType":"uint256","name":"redemptionQueue","type":"uint256"},{"internalType":"uint256","name":"processedRedemptionQueue","type":"uint256"},{"internalType":"uint256","name":"depositSharePrice","type":"uint256"},{"internalType":"uint256","name":"redemptionSharePrice_","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"additionalLoanBalance","type":"uint256"}],"name":"utilization","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"utilization","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"enum IVault.TrancheId","name":"trancheId","type":"uint8"},{"internalType":"uint256","name":"maxAmount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawAdminFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"noteToken","type":"address"},{"internalType":"uint256","name":"loanId","type":"uint256"}],"name":"withdrawCollateral","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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