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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

import "./PoolCalculations.sol";
import "./PoolTransfers.sol";
import "./ILendingPool.sol";

import "../fee_sharing/IFeeSharing.sol";
import "../authority/AuthorityAware.sol";
import "../vaults/TrancheVault.sol";

contract LendingPool is ILendingPool, AuthorityAware, PausableUpgradeable {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Math for uint;

    /*///////////////////////////////////
       CONSTANTS
    ///////////////////////////////////*/
    string public constant VERSION = "2023-06-12";

    uint internal constant WAD = 10 ** 18;
    uint internal constant DAY = 24 * 60 * 60;
    uint internal constant YEAR = 365 * DAY;

    // DO NOT TOUCH WITHOUT LIBRARY CONSIDERATIONS
    struct Rewardable {
        uint stakedAssets;
        uint lockedPlatformTokens;
        uint redeemedRewards;
        uint64 start;
    }

    struct RollOverSetting {
        bool enabled;
        bool principal;
        bool rewards;
        bool platformTokens;
    }

    enum Stages {                   // WARNING, DO NOT REORDER ENUM!!!
        INITIAL,                    // 0
        OPEN,                       // 1
        FUNDED,                     // 2
        FUNDING_FAILED,             // 3
        FLC_DEPOSITED,              // 4
        BORROWED,                   // 5
        BORROWER_INTEREST_REPAID,   // 6
        DELINQUENT,                 // 7
        REPAID,                     // 8
        DEFAULTED,                  // 9
        FLC_WITHDRAWN               // 10
    }

    struct LendingPoolParams {
        string name;
        string token;
        address stableCoinContractAddress;
        address platformTokenContractAddress;
        uint minFundingCapacity;
        uint maxFundingCapacity;
        uint64 fundingPeriodSeconds;
        uint64 lendingTermSeconds;
        address borrowerAddress;
        uint firstLossAssets;
        uint borrowerTotalInterestRateWad;
        uint repaymentRecurrenceDays;
        uint gracePeriodDays;
        uint protocolFeeWad;
        uint defaultPenalty;
        uint penaltyRateWad;
        uint8 tranchesCount;
        uint[] trancheAPRsWads;
        uint[] trancheBoostedAPRsWads;
        uint[] trancheBoostRatios;
        uint[] trancheCoveragesWads;
    }

    /*///////////////////////////////////
       CONTRACT VARIABLES
    ///////////////////////////////////*/
    /*Initializer parameters*/
    string public name;
    string public token;
    address public stableCoinContractAddress;
    address public platformTokenContractAddress;
    uint public minFundingCapacity;
    uint public maxFundingCapacity;
    uint64 public fundingPeriodSeconds;
    uint64 public lendingTermSeconds;
    address public borrowerAddress;
    uint public firstLossAssets;
    uint public repaymentRecurrenceDays;
    uint public gracePeriodDays;
    uint public borrowerTotalInterestRateWad;
    uint public protocolFeeWad;
    uint public defaultPenalty;
    uint public penaltyRateWad;
    uint8 public tranchesCount;
    uint[] public trancheAPRsWads;
    uint[] public trancheBoostedAPRsWads;
    uint[] public trancheBoostRatios;
    uint[] public trancheCoveragesWads;
    /* Other contract addresses */
    address public poolFactoryAddress;
    address public feeSharingContractAddress;
    address[] public trancheVaultAddresses;
    /* Some Timestamps */
    uint64 public openedAt;
    uint64 public fundedAt;
    uint64 public fundingFailedAt;
    uint64 public flcDepositedAt;
    uint64 public borrowedAt;
    uint64 public repaidAt;
    uint64 public flcWithdrawntAt;
    uint64 public defaultedAt;

    /* Interests & Yields */
    uint public collectedAssets;
    uint public borrowedAssets;
    uint public borrowerInterestRepaid;

    EnumerableSet.AddressSet internal s_lenders;

    /// @dev trancheId => (lenderAddress => RewardableRecord)
    mapping(uint8 => mapping(address => Rewardable)) public s_trancheRewardables;

    /// @dev trancheId => stakedassets
    mapping(uint8 => uint256) public s_totalStakedAssetsByTranche;

    /// @dev trancheId => lockedTokens
    mapping(uint8 => uint256) public s_totalLockedPlatformTokensByTranche;

    /// @dev lenderAddress => RollOverSetting
    mapping(address => RollOverSetting) private s_rollOverSettings;

    Stages public currentStage;

    /*///////////////////////////////////
       MODIFIERS
    ///////////////////////////////////*/

    modifier authTrancheVault(uint8 id) {
        _authTrancheVault(id);
        _;
    }

    function _authTrancheVault(uint8 id) internal view {
        require(id < trancheVaultAddresses.length, "LP001"); // "LendingPool: invalid trancheVault id"
        require(trancheVaultAddresses[id] == _msgSender(), "LP002"); // "LendingPool: trancheVault auth"
    }

    modifier onlyPoolBorrower() {
        _onlyPoolBorrower();
        _;
    }

    function _onlyPoolBorrower() internal view {
        require(_msgSender() == borrowerAddress, "LP003"); // "LendingPool: not a borrower"
    }

    modifier atStage(Stages _stage) {
        _atStage(_stage);
        _;
    }

    function _atStage(Stages _stage) internal view {
        require(currentStage == _stage, "LP004"); // "LendingPool: not at correct stage"
    }

    modifier atStages2(Stages _stage1, Stages _stage2) {
        _atStages2(_stage1, _stage2);
        _;
    }

    function _atStages2(Stages _stage1, Stages _stage2) internal view {
        require(currentStage == _stage1 || currentStage == _stage2, "LP004"); // "LendingPool: not at correct stage"
    }

    modifier atStages3(
        Stages _stage1,
        Stages _stage2,
        Stages _stage3
    ) {
        _atStages3(_stage1, _stage2, _stage3);
        _;
    }

    function _atStages3(Stages _stage1, Stages _stage2, Stages _stage3) internal view {
        require(
            currentStage == _stage1 || currentStage == _stage2 || currentStage == _stage3,
            "LP004" // "LendingPool: not at correct stage"
        );
    }

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

    // State Changes //
    event PoolInitialized(
        LendingPoolParams params,
        address[] _trancheVaultAddresses,
        address _feeSharingContractAddress,
        address _authorityAddress
    );
    event PoolOpen(uint64 openedAt);
    event PoolFunded(uint64 fundedAt, uint collectedAssets);
    event PoolFundingFailed(uint64 fundingFailedAt);
    event PoolRepaid(uint64 repaidAt);
    event PoolDefaulted(uint64 defaultedAt);
    event PoolFirstLossCapitalWithdrawn(uint64 flcWithdrawntAt);

    // Lender //
    event LenderDeposit(address indexed lender, uint8 indexed trancheId, uint256 amount);
    event LenderWithdraw(address indexed lender, uint8 indexed trancheId, uint256 amount);
    event LenderWithdrawInterest(address indexed lender, uint8 indexed trancheId, uint256 amount);
    event LenderTrancheRewardsChange(
        address indexed lender,
        uint8 indexed trancheId,
        uint lenderEffectiveAprWad,
        uint totalExpectedRewards,
        uint redeemedRewards
    );
    event LenderLockPlatformTokens(address indexed lender, uint8 indexed trancheId, uint256 amount);
    event LenderUnlockPlatformTokens(address indexed lender, uint8 indexed trancheId, uint256 amount);

    // Borrower //
    event BorrowerDepositFirstLossCapital(address indexed borrower, uint amount);
    event BorrowerBorrow(address indexed borrower, uint amount);
    event BorrowerPayInterest(
        address indexed borrower,
        uint amount,
        uint lendersDistributedAmount,
        uint feeSharingContractAmount
    );
    event BorrowerPayPenalty(address indexed borrower, uint amount);
    event BorrowerRepayPrincipal(address indexed borrower, uint amount);
    event BorrowerWithdrawFirstLossCapital(address indexed borrower, uint amount);

    /*///////////////////////////////////
       INITIALIZATION
    ///////////////////////////////////*/

    function initialize(
        LendingPoolParams calldata params,
        address[] calldata _trancheVaultAddresses,
        address _feeSharingContractAddress,
        address _authorityAddress,
        address _poolFactoryAddress
    ) external initializer {
        PoolCalculations.validateInitParams(
            params,
            _trancheVaultAddresses,
            _feeSharingContractAddress,
            _authorityAddress
        );

        PoolCalculations.validateWad(params.trancheCoveragesWads);

        name = params.name;
        token = params.token;
        stableCoinContractAddress = params.stableCoinContractAddress;
        platformTokenContractAddress = params.platformTokenContractAddress;
        minFundingCapacity = params.minFundingCapacity;
        maxFundingCapacity = params.maxFundingCapacity;
        fundingPeriodSeconds = params.fundingPeriodSeconds;
        lendingTermSeconds = params.lendingTermSeconds;
        borrowerAddress = params.borrowerAddress;
        firstLossAssets = params.firstLossAssets;
        borrowerTotalInterestRateWad = params.borrowerTotalInterestRateWad;
        repaymentRecurrenceDays = params.repaymentRecurrenceDays;
        gracePeriodDays = params.gracePeriodDays;
        protocolFeeWad = params.protocolFeeWad;
        defaultPenalty = params.defaultPenalty;
        penaltyRateWad = params.penaltyRateWad;
        tranchesCount = params.tranchesCount;
        trancheAPRsWads = params.trancheAPRsWads;
        trancheBoostedAPRsWads = params.trancheBoostedAPRsWads;
        trancheBoostRatios = params.trancheBoostRatios;
        trancheCoveragesWads = params.trancheCoveragesWads;

        trancheVaultAddresses = _trancheVaultAddresses;
        feeSharingContractAddress = _feeSharingContractAddress;
        poolFactoryAddress = _poolFactoryAddress;

        __Ownable_init();
        __Pausable_init();
        __AuthorityAware__init(_authorityAddress);

        emit PoolInitialized(params, _trancheVaultAddresses, _feeSharingContractAddress, _authorityAddress);
    }

    /*///////////////////////////////////
       ADMIN FUNCTIONS
    ///////////////////////////////////*/

    /** @dev Pauses the pool */
    function pause() external onlyOwnerOrAdmin {
        _pause();
    }

    /** @dev Unpauses the pool */
    function unpause() external onlyOwnerOrAdmin {
        _unpause();
    }

    /** @notice Marks the pool as opened. This function has to be called by *owner* when
     * - sets openedAt to current block timestamp
     * - enables deposits and withdrawals to tranche vaults
     */
    function adminOpenPool() external onlyOwnerOrAdmin atStage(Stages.FLC_DEPOSITED) whenNotPaused {
        openedAt = uint64(block.timestamp);
        currentStage = Stages.OPEN;

        TrancheVault[] memory vaults = trancheVaultContracts();

        for (uint i; i < trancheVaultAddresses.length; i++) {
            vaults[i].enableDeposits();
            vaults[i].enableWithdrawals();
        }

        emit PoolOpen(openedAt);
    }

    /** @notice Checks whether the pool was funded successfully or not.
     *  this function is expected to be called by *owner* once the funding period ends
     */
    function adminTransitionToFundedState() external onlyOwnerOrAdmin atStage(Stages.OPEN) {
        require(block.timestamp >= openedAt + fundingPeriodSeconds, "Cannot accrue interest or declare failure before start time");
        if (collectedAssets >= minFundingCapacity) {
            _transitionToFundedStage();
        } else {
            _transitionToFundingFailedStage();
        }
    }

    function adminTransitionToDefaultedState() external onlyOwnerOrAdmin atStage(Stages.BORROWED) {
        require(block.timestamp >= fundedAt + lendingTermSeconds, "LP023"); // "LendingPool: maturityDate not reached"
        _transitionToDefaultedStage();
    }

    function _transitionToFundedStage() internal whenNotPaused {
        fundedAt = uint64(block.timestamp);
        currentStage = Stages.FUNDED;

        TrancheVault[] memory vaults = trancheVaultContracts();

        for (uint i; i < vaults.length; i++) {
            TrancheVault tv = vaults[i];
            tv.disableDeposits();
            tv.disableWithdrawals();
            tv.sendAssetsToPool(tv.totalAssets());
        }

        emit PoolFunded(fundedAt, collectedAssets);
    }

    function _transitionToFundingFailedStage() internal whenNotPaused {
        fundingFailedAt = uint64(block.timestamp);
        currentStage = Stages.FUNDING_FAILED;
        
        TrancheVault[] memory vaults = trancheVaultContracts();

        for (uint i; i < trancheVaultAddresses.length; i++) {
            vaults[i].disableDeposits();
            vaults[i].enableWithdrawals();
        }
        emit PoolFundingFailed(fundingFailedAt);
    }

    function _transitionToFlcDepositedStage(uint flcAssets) internal whenNotPaused {
        flcDepositedAt = uint64(block.timestamp);
        currentStage = Stages.FLC_DEPOSITED;
        emit BorrowerDepositFirstLossCapital(borrowerAddress, flcAssets);
    }

    function _transitionToBorrowedStage(uint amountToBorrow) internal whenNotPaused {
        borrowedAt = uint64(block.timestamp);
        borrowedAssets = amountToBorrow;
        currentStage = Stages.BORROWED;

        emit BorrowerBorrow(borrowerAddress, amountToBorrow);
    }

    function _transitionToPrincipalRepaidStage(uint repaidPrincipal) internal whenNotPaused {
        repaidAt = uint64(block.timestamp);
        currentStage = Stages.REPAID;
        emit BorrowerRepayPrincipal(borrowerAddress, repaidPrincipal);
        emit PoolRepaid(repaidAt);
    }

    function _transitionToFlcWithdrawnStage(uint flcAssets) internal whenNotPaused {
        flcWithdrawntAt = uint64(block.timestamp);
        currentStage = Stages.FLC_WITHDRAWN;
        emit BorrowerWithdrawFirstLossCapital(borrowerAddress, flcAssets);
    }

    function _claimTrancheInterestForLender(address lender, uint8 trancheId) internal {
        uint rewards = lenderRewardsByTrancheRedeemable(lender, trancheId);
        if (rewards > 0) {
            s_trancheRewardables[trancheId][lender].redeemedRewards += rewards;
            SafeERC20.safeTransfer(_stableCoinContract(), lender, rewards);
            emit LenderWithdrawInterest(lender, trancheId, rewards);
        }
    }

    function _claimInterestForAllLenders() internal {
        TrancheVault[] memory vaults = trancheVaultContracts();

        for (uint8 i; i < tranchesCount; i++) {
            for (uint j; j < lenderCount(); j++) {
                _claimTrancheInterestForLender(lendersAt(j), vaults[i].id());
            }
        }
    }

    /**
     * @notice Transitions the pool to the defaulted state and pays out remaining assets to the tranche vaults
     * @dev This function is expected to be called by *owner* after the maturity date has passed and principal has not been repaid
     */
    function _transitionToDefaultedStage() internal whenNotPaused {
        defaultedAt = uint64(block.timestamp);
        currentStage = Stages.DEFAULTED;
        _claimInterestForAllLenders();
        // TODO: update repaid interest to be the total interest paid to lenders
        // TODO: should the protocol fees be paid in event of default
        uint availableAssets = _stableCoinContract().balanceOf(address(this));
        TrancheVault[] memory vaults = trancheVaultContracts();

        for (uint i; i < trancheVaultAddresses.length; i++) {
            TrancheVault tv = vaults[i];
            uint assetsToSend = (trancheCoveragesWads[i] * availableAssets) / WAD;
            uint trancheDefaultRatioWad = (assetsToSend * WAD) / tv.totalAssets();

            if (assetsToSend > 0) {
                SafeERC20.safeTransfer(_stableCoinContract(), address(tv), assetsToSend);
            }
            availableAssets -= assetsToSend;
            tv.setDefaultRatioWad(trancheDefaultRatioWad);
            tv.enableWithdrawals();
        }

        emit PoolDefaulted(defaultedAt);
    }

    /*///////////////////////////////////
      Lender (please also see onTrancheDeposit() and onTrancheWithdraw())
      Error group: 1
    ///////////////////////////////////*/

    /** @notice Lock platform tokens in order to get APR boost
     *  @param trancheId tranche id
     *  @param platformTokens amount of PLATFORM tokens to lock
     */
    function lenderLockPlatformTokensByTranche(
        uint8 trancheId,
        uint platformTokens
    ) external onlyLender atStage(Stages.OPEN) whenNotPaused {
        require(
            platformTokens <= lenderPlatformTokensByTrancheLockable(_msgSender(), trancheId),
            "LP101" //"LendingPool: lock will lead to overboost"
        );
        require(IERC20(platformTokenContractAddress).totalSupply() > 0, "Lock: Token Locking Disabled");

        Rewardable storage r = s_trancheRewardables[trancheId][_msgSender()];
        r.lockedPlatformTokens += platformTokens;
        s_totalLockedPlatformTokensByTranche[trancheId] += platformTokens;

        SafeERC20.safeTransferFrom(IERC20(platformTokenContractAddress), _msgSender(), address(this), platformTokens);

        emit LenderLockPlatformTokens(_msgSender(), trancheId, platformTokens);
        _emitLenderTrancheRewardsChange(_msgSender(), trancheId);
    }

    /** @notice Unlock platform tokens after the pool is repaid AND rewards are redeemed
     *  @param trancheId tranche id
     *  @param platformTokens amount of PLATFORM tokens to unlock
     */
    function lenderUnlockPlatformTokensByTranche(
        uint8 trancheId,
        uint platformTokens
    ) external onlyLender atStages2(Stages.REPAID, Stages.FLC_WITHDRAWN) whenNotPaused {
        require(!s_rollOverSettings[msg.sender].platformTokens, "LP102"); // "LendingPool: tokens are locked for rollover"
        require(lenderRewardsByTrancheRedeemable(_msgSender(), trancheId) == 0, "LP103"); // "LendingPool: rewards not redeemed"
        require(IERC20(platformTokenContractAddress).totalSupply() > 0, "Unlock: Token Locking Disabled");

        Rewardable storage r = s_trancheRewardables[trancheId][_msgSender()];

        require(r.lockedPlatformTokens >= platformTokens, "LP104"); // LendingPool: not enough locked tokens"
        r.lockedPlatformTokens -= platformTokens;

        SafeERC20.safeTransfer(IERC20(platformTokenContractAddress), _msgSender(), platformTokens);

        emit LenderUnlockPlatformTokens(_msgSender(), trancheId, platformTokens);
    }

    /** @notice Redeem currently available rewards for a tranche
     *  @param trancheId tranche id
     *  @param toWithdraw amount of rewards to withdraw
     */
    function lenderRedeemRewardsByTranche(
        uint8 trancheId,
        uint toWithdraw
    ) public onlyLender atStages3(Stages.BORROWED, Stages.REPAID, Stages.FLC_WITHDRAWN) whenNotPaused {
        require(!s_rollOverSettings[msg.sender].rewards, "LP105"); // "LendingPool: rewards are locked for rollover"
        if (toWithdraw == 0) {
            return;
        }
        uint maxWithdraw = lenderRewardsByTrancheRedeemable(_msgSender(), trancheId);
        require(toWithdraw <= maxWithdraw, "LP106"); // "LendingPool: amount to withdraw is too big"
        s_trancheRewardables[trancheId][_msgSender()].redeemedRewards += toWithdraw;

        SafeERC20.safeTransfer(_stableCoinContract(), _msgSender(), toWithdraw);

        // if (IERC20(stableCoinContractAddress()).balanceOf(address(this)) < poolBalanceThreshold()) {
        //     _transitionToDelinquentStage();
        // }

        emit LenderWithdrawInterest(_msgSender(), trancheId, toWithdraw);
        _emitLenderTrancheRewardsChange(_msgSender(), trancheId);
    }

    /** @notice Redeem currently available rewards for two tranches
     *  @param toWithdraws amount of rewards to withdraw accross all tranches
     */
    function lenderRedeemRewards(
        uint[] calldata toWithdraws
    ) external onlyLender atStages3(Stages.BORROWED, Stages.REPAID, Stages.FLC_WITHDRAWN) whenNotPaused {
        require(!s_rollOverSettings[msg.sender].rewards, "LP105"); //"LendingPool: rewards are locked for rollover"
        require(toWithdraws.length == tranchesCount, "LP107"); //"LendingPool: wrong amount of tranches"
        for (uint8 i; i < toWithdraws.length; i++) {
            lenderRedeemRewardsByTranche(i, toWithdraws[i]);
        }
    }

    /* VIEWS */

    /// @notice average APR of all lenders across all tranches, boosted or not
    function allLendersInterest() public view returns (uint) {
        return (((allLendersEffectiveAprWad() * collectedAssets) / WAD) * lendingTermSeconds) / YEAR;
    }

    function allLendersInterestByDate() public view returns (uint) {
        return PoolCalculations.allLendersInterestByDate(this);
    }

    /// @notice average APR of all lenders across all tranches, boosted or not
    function allLendersEffectiveAprWad() public view returns (uint) {
        return PoolCalculations.allLendersEffectiveAprWad(this, tranchesCount);
    }

    /// @notice weighted APR accross all the lenders
    function lenderTotalAprWad(address lenderAddress) public view returns (uint) {
        return PoolCalculations.lenderTotalAprWad(this, lenderAddress);
    }

    /// @notice  Returns amount of stablecoins deposited across all the pool tranches by a lender
    function lenderAllDepositedAssets(address lenderAddress) public view returns (uint totalAssets) {
        totalAssets = 0;
        for (uint8 i; i < tranchesCount; ++i) {
            totalAssets += s_trancheRewardables[i][lenderAddress].stakedAssets;
        }
    }

    /* VIEWS BY TRANCHE*/

    /** @notice  Returns amount of stablecoins deposited to a pool tranche by a lender
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderDepositedAssetsByTranche(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return s_trancheRewardables[trancheId][lenderAddress].stakedAssets;
    }

    /** @notice Returns amount of stablecoins to be paid for the lender by the end of the pool term.
     *  `lenderAPR * lenderDepositedAssets * lendingTermSeconds / YEAR`
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderTotalExpectedRewardsByTranche(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return
            PoolCalculations.lenderTotalExpectedRewardsByTranche(
                lenderDepositedAssetsByTranche(lenderAddress, trancheId),
                lenderEffectiveAprByTrancheWad(lenderAddress, trancheId),
                lendingTermSeconds
            );
    }

    /** @notice Returns amount of stablecoin rewards generated for the lenders by current second.
     *  `lenderTotalExpectedRewardsByTranche * (secondsElapsed / lendingTermSeconds)`
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderRewardsByTrancheGeneratedByDate(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return PoolCalculations.lenderRewardsByTrancheGeneratedByDate(this, lenderAddress, trancheId);
    }

    /** @notice Returns amount of stablecoin rewards that has been withdrawn by the lender.
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderRewardsByTrancheRedeemed(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return s_trancheRewardables[trancheId][lenderAddress].redeemedRewards;
    }

    /** @notice Returns amount of stablecoin rewards that can be withdrawn by the lender. (generated - redeemed). Special means this one is distinguished from the FE version and is only used within the SCs
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderRewardsByTrancheRedeemable(address lenderAddress, uint8 trancheId) public view returns (uint) {
        uint256 willReward = lenderRewardsByTrancheGeneratedByDate(lenderAddress, trancheId);
        uint256 hasRewarded = lenderRewardsByTrancheRedeemed(lenderAddress, trancheId);
        return willReward - hasRewarded;
    }

    /** @notice Returns amount of stablecoin rewards that can be withdrawn by the lender. (generated - redeemed) only use in FE
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderRewardsByTrancheRedeemableSpecial(address lenderAddress, uint8 trancheId) public view returns (uint) {
        uint256 willReward = lenderRewardsByTrancheGeneratedByDate(lenderAddress, trancheId);
        uint256 hasRewarded = lenderRewardsByTrancheRedeemed(lenderAddress, trancheId);
        if(hasRewarded > willReward) {
            return 0;
        }
        return willReward - hasRewarded;
    }

    /** @notice Returns APR for the lender taking into account all the deposited USDC + platform tokens
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderEffectiveAprByTrancheWad(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return PoolCalculations.lenderEffectiveAprByTrancheWad(this, lenderAddress, trancheId);
    }

    /** @notice Returns amount of platform tokens locked by the lender
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderPlatformTokensByTrancheLocked(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return s_trancheRewardables[trancheId][lenderAddress].lockedPlatformTokens;
    }

    /** @notice Returns amount of staked tokens committed by the lender
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderStakedTokensByTranche(address lenderAddress, uint8 trancheId) public view returns (uint) {
        return s_trancheRewardables[trancheId][lenderAddress].stakedAssets;
    }

    /** @notice Returns amount of platform tokens that lender can lock in order to boost their APR
     *  @param lenderAddress lender address
     *  @param trancheId tranche id
     */
    function lenderPlatformTokensByTrancheLockable(address lenderAddress, uint8 trancheId) public view returns (uint) {
        Rewardable storage r = s_trancheRewardables[trancheId][lenderAddress];
        uint maxLockablePlatformTokens = r.stakedAssets * trancheBoostRatios[trancheId];
        return maxLockablePlatformTokens - r.lockedPlatformTokens;
    }

    /*///////////////////////////////////
       Rollover settings
    ///////////////////////////////////*/
    /** @notice marks the intent of the lender to roll over their capital to the upcoming pool (called by older pool)
     *  if you opt to roll over you will not be able to withdraw stablecoins / platform tokens from the pool
     *  @param principal whether the principal should be rolled over
     *  @param rewards whether the rewards should be rolled over
     *  @param platformTokens whether the platform tokens should be rolled over
     */
    function lenderEnableRollOver(bool principal, bool rewards, bool platformTokens) external onlyLender {
        address lender = _msgSender();
        s_rollOverSettings[lender] = RollOverSetting(true, principal, rewards, platformTokens);
        PoolTransfers.lenderEnableRollOver(this, principal, rewards, platformTokens, lender);
    }

    /**
     * @dev This function rolls funds from prior deployments into currently active deployments
     * @param deadLendingPoolAddr The address of the lender whose funds are transfering over to the new lender
     * @param deadTrancheAddrs The address of the tranches whose funds are mapping 1:1 with the next traches
     * @param lenderStartIndex The first lender to start migrating over
     * @param lenderEndIndex The last lender to migrate
     */
    function executeRollover(
        address deadLendingPoolAddr,
        address[] memory deadTrancheAddrs,
        uint256 lenderStartIndex,
        uint256 lenderEndIndex
    ) external onlyOwnerOrAdmin atStage(Stages.OPEN) whenNotPaused {
        PoolTransfers.executeRollover(this, deadLendingPoolAddr, deadTrancheAddrs, lenderStartIndex, lenderEndIndex);
    }

    /** @notice cancels lenders intent to roll over the funds to the next pool.
     */
    function lenderDisableRollOver() external onlyLender {
        s_rollOverSettings[_msgSender()] = RollOverSetting(false, false, false, false);
    }

    /** @notice returns lender's roll over settings
     *  @param lender lender address
     */
    function lenderRollOverSettings(address lender) external view returns (RollOverSetting memory) {
        return s_rollOverSettings[lender];
    }

    /*///////////////////////////////////
       Borrower functions
       Error group: 2
    ///////////////////////////////////*/
    /** @notice Deposits first loss capital into the pool
     *  should be called by the borrower before the pool can start
     */
    function borrowerDepositFirstLossCapital() external onlyPoolBorrower atStage(Stages.INITIAL) whenNotPaused {
        _transitionToFlcDepositedStage(firstLossAssets);
        SafeERC20.safeTransferFrom(_stableCoinContract(), msg.sender, address(this), firstLossAssets);
    }

    /** @notice Borrows collected funds from the pool */
    function borrow() external onlyPoolBorrower atStage(Stages.FUNDED) whenNotPaused {
        _transitionToBorrowedStage(collectedAssets);
        SafeERC20.safeTransfer(_stableCoinContract(), borrowerAddress, collectedAssets);
    }

    /** @notice Lets the borrower withdraw first loss deposit in the event of funding failed */
    function borrowerRecoverFirstLossCapital() external atStage(Stages.FUNDING_FAILED) {
        uint256 copyFirstLossAssets = firstLossAssets;
        firstLossAssets = 0;
        SafeERC20.safeTransfer(_stableCoinContract(), borrowerAddress, copyFirstLossAssets);
    }

    /** @notice Make an interest payment.
     *  If the pool is delinquent, the minimum payment is penalty + whatever interest that needs to be paid to bring the pool back to healthy state
     */
    function borrowerPayInterest(uint assets) external onlyPoolBorrower whenNotPaused {
        uint penalty = borrowerPenaltyAmount();
        require(penalty < assets, "LP201"); // "LendingPool: penalty cannot be more than assets"

        if (penalty > 0) {
            uint balanceDifference = poolBalanceThreshold() - poolBalance();
            require(assets >= penalty + balanceDifference, "LP202"); // "LendingPool: penalty+interest will not bring pool to healthy state"
        }

        uint feeableInterestAmount = assets - penalty;
        if (feeableInterestAmount > borrowerOutstandingInterest()) {
            feeableInterestAmount = borrowerOutstandingInterest();
        }

        uint assetsToSendToFeeSharing = (feeableInterestAmount * protocolFeeWad) / WAD + penalty;
        uint assetsForLenders = assets - assetsToSendToFeeSharing;

        borrowerInterestRepaid = borrowerInterestRepaid + assets - penalty;

        if (assetsToSendToFeeSharing > 0) {
            SafeERC20.safeTransfer(_stableCoinContract(), feeSharingContractAddress, assetsToSendToFeeSharing);
        }

        SafeERC20.safeTransferFrom(_stableCoinContract(), _msgSender(), address(this), assets);

        if (penalty > 0) {
            emit BorrowerPayPenalty(_msgSender(), penalty);
        }

        emit BorrowerPayInterest(borrowerAddress, assets, assetsForLenders, assetsToSendToFeeSharing);
    }

    /** @notice Repay principal
     *  can be called only after all interest is paid
     *  can be called only after all penalties are paid
     */
    function borrowerRepayPrincipal() external onlyPoolBorrower atStage(Stages.BORROWED) whenNotPaused {
        require(borrowerOutstandingInterest() == 0, "LP203"); // "LendingPool: interest must be paid before repaying principal"
        require(borrowerPenaltyAmount() == 0, "LP204"); // "LendingPool: penalty must be paid before repaying principal"

        _transitionToPrincipalRepaidStage(borrowedAssets);
        TrancheVault[] memory vaults = trancheVaultContracts();

        SafeERC20.safeTransferFrom(_stableCoinContract(), _msgSender(), address(this), borrowedAssets);
        for (uint i; i < tranchesCount; ++i) {
            TrancheVault tv = vaults[i];
            SafeERC20.safeTransfer(_stableCoinContract(), address(tv), tv.totalAssets());
            tv.enableWithdrawals();
        }
    }

    /** @notice Withdraw first loss capital and excess spread
     *  can be called only after principal is repaid
     */
    function borrowerWithdrawFirstLossCapitalAndExcessSpread() external onlyPoolBorrower atStage(Stages.REPAID) whenNotPaused {
        uint assetsToSend = firstLossAssets + borrowerExcessSpread();
        _transitionToFlcWithdrawnStage(assetsToSend);
        SafeERC20.safeTransfer(_stableCoinContract(), borrowerAddress, assetsToSend);
    }

    /* VIEWS */
    /** @notice Pool balance threshold.
     *  if pool balance fallse below this threshold, the pool is considered delinquent and the borrower starts to face penalties.
     */
    function poolBalanceThreshold() public view returns (uint) {
        return PoolCalculations.poolBalanceThreshold(this);
    }

    /** @notice Pool balance
     * First loss capital minus whatever rewards are generated for the lenders by date.
     */
    function poolBalance() public view returns (uint) {
        return PoolCalculations.poolBalance(this);
    }

    function lendersAt(uint i) public view returns (address) {
        return s_lenders.at(i);
    }

    function lenderCount() public view returns (uint256) {
        return s_lenders.length();
    }

    /** @notice how much penalty the borrower owes because of the delinquency fact */
    function borrowerPenaltyAmount() public view returns (uint) {
        if(currentStage > Stages.FLC_DEPOSITED) {
            return PoolCalculations.borrowerPenaltyAmount(this);
        }
    }

    /** @dev total interest to be paid by borrower = adjustedBorrowerAPR * collectedAssets
     *  @return interest amount of assets to be repaid
     */
    function borrowerExpectedInterest() public view returns (uint) {
        return PoolCalculations.borrowerExpectedInterest(collectedAssets, borrowerAdjustedInterestRateWad());
    }

    /** @dev outstanding borrower interest = expectedBorrowerInterest - borrowerInterestAlreadyPaid
     *  @return interest amount of outstanding assets to be repaid
     */
    function borrowerOutstandingInterest() public view returns (uint) {
        return PoolCalculations.borrowerOutstandingInterest(borrowerInterestRepaid, borrowerExpectedInterest());
    }

    /** @notice excess spread = interest paid by borrower - interest paid to lenders - fees
     *  Once the pool ends, can be withdrawn by the borrower alongside the first loss capital
     */
    function borrowerExcessSpread() public view returns (uint) {
        return PoolCalculations.borrowerExcessSpread(this);
    }

    /** @dev adjusted borrower interest rate = APR * duration / 365 days
     *  @return adj borrower interest rate adjusted by duration of the loan
     */
    function borrowerAdjustedInterestRateWad() public view returns (uint adj) {
        return PoolCalculations.borrowerAdjustedInterestRateWad(borrowerTotalInterestRateWad, lendingTermSeconds);
    }

    /*///////////////////////////////////
       COMMUNICATION WITH VAULTS
       Error group: 3
    ///////////////////////////////////*/

    /// @dev TrancheVault will call that callback function when a lender deposits assets
    function onTrancheDeposit(
        uint8 trancheId,
        address depositorAddress,
        uint amount
    ) external authTrancheVault(trancheId) {
        // 1. find / create the rewardable
        Rewardable storage rewardable = s_trancheRewardables[trancheId][depositorAddress];

        // 2. add lender to the lenders set
        s_lenders.add(depositorAddress);

        // 3. add to the staked assets
        rewardable.stakedAssets += amount;
        collectedAssets += amount;
        s_totalStakedAssetsByTranche[trancheId] += amount;

        // 4. set the start of the rewardable
        rewardable.start = uint64(block.timestamp);

        emit LenderDeposit(depositorAddress, trancheId, amount);
        _emitLenderTrancheRewardsChange(depositorAddress, trancheId);
    }

    /// @dev TrancheVault will call that callback function when a lender withdraws assets
    function onTrancheWithdraw(
        uint8 trancheId,
        address depositorAddress,
        uint amount
    ) external authTrancheVault(trancheId) whenNotPaused {
        require(!s_rollOverSettings[depositorAddress].principal, "LP301"); // "LendingPool: principal locked for rollover"

        if (currentStage == Stages.REPAID || currentStage == Stages.FLC_WITHDRAWN) {
            emit LenderWithdraw(depositorAddress, trancheId, amount);
        } else {
            Rewardable storage rewardable = s_trancheRewardables[trancheId][depositorAddress];

            assert(rewardable.stakedAssets >= amount);

            rewardable.stakedAssets -= amount;
            collectedAssets -= amount;
            s_totalStakedAssetsByTranche[trancheId] -= amount;

            if (rewardable.stakedAssets == 0) {
                s_lenders.remove(depositorAddress);
            }
            emit LenderWithdraw(depositorAddress, trancheId, amount);
            _emitLenderTrancheRewardsChange(depositorAddress, trancheId);
        }
    }

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

    function trancheVaultContracts() internal view returns (TrancheVault[] memory) {
        return PoolCalculations.trancheVaultContracts(this);
    }

    function _emitLenderTrancheRewardsChange(address lenderAddress, uint8 trancheId) internal {
        emit LenderTrancheRewardsChange(
            lenderAddress,
            trancheId,
            lenderEffectiveAprByTrancheWad(lenderAddress, trancheId),
            lenderTotalExpectedRewardsByTranche(lenderAddress, trancheId),
            lenderRewardsByTrancheRedeemed(lenderAddress, trancheId)
        );
    }

    function _stableCoinContract() internal view returns (IERC20) {
        return IERC20(stableCoinContractAddress);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions 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 v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20Upgradeable.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (interfaces/IERC4626.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20Upgradeable.sol";
import "../token/ERC20/extensions/IERC20MetadataUpgradeable.sol";

/**
 * @dev Interface of the ERC4626 "Tokenized Vault Standard", as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
 *
 * _Available since v4.7._
 */
interface IERC4626Upgradeable is IERC20Upgradeable, IERC20MetadataUpgradeable {
    event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);

    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
     *
     * - MUST be an ERC-20 token contract.
     * - MUST NOT revert.
     */
    function asset() external view returns (address assetTokenAddress);

    /**
     * @dev Returns the total amount of the underlying asset that is “managed” by Vault.
     *
     * - SHOULD include any compounding that occurs from yield.
     * - MUST be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT revert.
     */
    function totalAssets() external view returns (uint256 totalManagedAssets);

    /**
     * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToShares(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToAssets(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
     * through a deposit call.
     *
     * - MUST return a limited value if receiver is subject to some deposit limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
     * - MUST NOT revert.
     */
    function maxDeposit(address receiver) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
     *   call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
     *   in the same transaction.
     * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
     *   deposit would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewDeposit(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   deposit execution, and are accounted for during deposit.
     * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
     * - MUST return a limited value if receiver is subject to some mint limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
     * - MUST NOT revert.
     */
    function maxMint(address receiver) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
     *   in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
     *   same transaction.
     * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
     *   would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by minting.
     */
    function previewMint(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
     *   execution, and are accounted for during mint.
     * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function mint(uint256 shares, address receiver) external returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
     * Vault, through a withdraw call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxWithdraw(address owner) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
     *   call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
     *   called
     *   in the same transaction.
     * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
     *   the withdrawal would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   withdraw execution, and are accounted for during withdraw.
     * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
     * through a redeem call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxRedeem(address owner) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
     *   in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
     *   same transaction.
     * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
     *   redemption would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by redeeming.
     */
    function previewRedeem(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   redeem execution, and are accounted for during redeem.
     * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) external returns (uint256 assets);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

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

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        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 (last updated v4.8.0) (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.openzeppelin.com/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, allowance(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 = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _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;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _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;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * 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 v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (token/ERC20/extensions/ERC4626.sol)

pragma solidity ^0.8.0;

import "../ERC20Upgradeable.sol";
import "../utils/SafeERC20Upgradeable.sol";
import "../../../interfaces/IERC4626Upgradeable.sol";
import "../../../utils/math/MathUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the ERC4626 "Tokenized Vault Standard" as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[EIP-4626].
 *
 * This extension allows the minting and burning of "shares" (represented using the ERC20 inheritance) in exchange for
 * underlying "assets" through standardized {deposit}, {mint}, {redeem} and {burn} workflows. This contract extends
 * the ERC20 standard. Any additional extensions included along it would affect the "shares" token represented by this
 * contract and not the "assets" token which is an independent contract.
 *
 * CAUTION: When the vault is empty or nearly empty, deposits are at high risk of being stolen through frontrunning with
 * a "donation" to the vault that inflates the price of a share. This is variously known as a donation or inflation
 * attack and is essentially a problem of slippage. Vault deployers can protect against this attack by making an initial
 * deposit of a non-trivial amount of the asset, such that price manipulation becomes infeasible. Withdrawals may
 * similarly be affected by slippage. Users can protect against this attack as well unexpected slippage in general by
 * verifying the amount received is as expected, using a wrapper that performs these checks such as
 * https://github.com/fei-protocol/ERC4626#erc4626router-and-base[ERC4626Router].
 *
 * _Available since v4.7._
 */
abstract contract ERC4626Upgradeable is Initializable, ERC20Upgradeable, IERC4626Upgradeable {
    using MathUpgradeable for uint256;

    IERC20Upgradeable private _asset;
    uint8 private _decimals;

    /**
     * @dev Set the underlying asset contract. This must be an ERC20-compatible contract (ERC20 or ERC777).
     */
    function __ERC4626_init(IERC20Upgradeable asset_) internal onlyInitializing {
        __ERC4626_init_unchained(asset_);
    }

    function __ERC4626_init_unchained(IERC20Upgradeable asset_) internal onlyInitializing {
        (bool success, uint8 assetDecimals) = _tryGetAssetDecimals(asset_);
        _decimals = success ? assetDecimals : super.decimals();
        _asset = asset_;
    }

    /**
     * @dev Attempts to fetch the asset decimals. A return value of false indicates that the attempt failed in some way.
     */
    function _tryGetAssetDecimals(IERC20Upgradeable asset_) private view returns (bool, uint8) {
        (bool success, bytes memory encodedDecimals) = address(asset_).staticcall(
            abi.encodeWithSelector(IERC20MetadataUpgradeable.decimals.selector)
        );
        if (success && encodedDecimals.length >= 32) {
            uint256 returnedDecimals = abi.decode(encodedDecimals, (uint256));
            if (returnedDecimals <= type(uint8).max) {
                return (true, uint8(returnedDecimals));
            }
        }
        return (false, 0);
    }

    /**
     * @dev Decimals are read from the underlying asset in the constructor and cached. If this fails (e.g., the asset
     * has not been created yet), the cached value is set to a default obtained by `super.decimals()` (which depends on
     * inheritance but is most likely 18). Override this function in order to set a guaranteed hardcoded value.
     * See {IERC20Metadata-decimals}.
     */
    function decimals() public view virtual override(IERC20MetadataUpgradeable, ERC20Upgradeable) returns (uint8) {
        return _decimals;
    }

    /** @dev See {IERC4626-asset}. */
    function asset() public view virtual override returns (address) {
        return address(_asset);
    }

    /** @dev See {IERC4626-totalAssets}. */
    function totalAssets() public view virtual override returns (uint256) {
        return _asset.balanceOf(address(this));
    }

    /** @dev See {IERC4626-convertToShares}. */
    function convertToShares(uint256 assets) public view virtual override returns (uint256 shares) {
        return _convertToShares(assets, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-convertToAssets}. */
    function convertToAssets(uint256 shares) public view virtual override returns (uint256 assets) {
        return _convertToAssets(shares, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-maxDeposit}. */
    function maxDeposit(address) public view virtual override returns (uint256) {
        return _isVaultCollateralized() ? type(uint256).max : 0;
    }

    /** @dev See {IERC4626-maxMint}. */
    function maxMint(address) public view virtual override returns (uint256) {
        return type(uint256).max;
    }

    /** @dev See {IERC4626-maxWithdraw}. */
    function maxWithdraw(address owner) public view virtual override returns (uint256) {
        return _convertToAssets(balanceOf(owner), MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-maxRedeem}. */
    function maxRedeem(address owner) public view virtual override returns (uint256) {
        return balanceOf(owner);
    }

    /** @dev See {IERC4626-previewDeposit}. */
    function previewDeposit(uint256 assets) public view virtual override returns (uint256) {
        return _convertToShares(assets, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-previewMint}. */
    function previewMint(uint256 shares) public view virtual override returns (uint256) {
        return _convertToAssets(shares, MathUpgradeable.Rounding.Up);
    }

    /** @dev See {IERC4626-previewWithdraw}. */
    function previewWithdraw(uint256 assets) public view virtual override returns (uint256) {
        return _convertToShares(assets, MathUpgradeable.Rounding.Up);
    }

    /** @dev See {IERC4626-previewRedeem}. */
    function previewRedeem(uint256 shares) public view virtual override returns (uint256) {
        return _convertToAssets(shares, MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-deposit}. */
    function deposit(uint256 assets, address receiver) public virtual override returns (uint256) {
        require(assets <= maxDeposit(receiver), "ERC4626: deposit more than max");

        uint256 shares = previewDeposit(assets);
        _deposit(_msgSender(), receiver, assets, shares);

        return shares;
    }

    /** @dev See {IERC4626-mint}.
     *
     * As opposed to {deposit}, minting is allowed even if the vault is in a state where the price of a share is zero.
     * In this case, the shares will be minted without requiring any assets to be deposited.
     */
    function mint(uint256 shares, address receiver) public virtual override returns (uint256) {
        require(shares <= maxMint(receiver), "ERC4626: mint more than max");

        uint256 assets = previewMint(shares);
        _deposit(_msgSender(), receiver, assets, shares);

        return assets;
    }

    /** @dev See {IERC4626-withdraw}. */
    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) public virtual override returns (uint256) {
        require(assets <= maxWithdraw(owner), "ERC4626: withdraw more than max");

        uint256 shares = previewWithdraw(assets);
        _withdraw(_msgSender(), receiver, owner, assets, shares);

        return shares;
    }

    /** @dev See {IERC4626-redeem}. */
    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) public virtual override returns (uint256) {
        require(shares <= maxRedeem(owner), "ERC4626: redeem more than max");

        uint256 assets = previewRedeem(shares);
        _withdraw(_msgSender(), receiver, owner, assets, shares);

        return assets;
    }

    /**
     * @dev Internal conversion function (from assets to shares) with support for rounding direction.
     *
     * Will revert if assets > 0, totalSupply > 0 and totalAssets = 0. That corresponds to a case where any asset
     * would represent an infinite amount of shares.
     */
    function _convertToShares(uint256 assets, MathUpgradeable.Rounding rounding) internal view virtual returns (uint256 shares) {
        uint256 supply = totalSupply();
        return
            (assets == 0 || supply == 0)
                ? _initialConvertToShares(assets, rounding)
                : assets.mulDiv(supply, totalAssets(), rounding);
    }

    /**
     * @dev Internal conversion function (from assets to shares) to apply when the vault is empty.
     *
     * NOTE: Make sure to keep this function consistent with {_initialConvertToAssets} when overriding it.
     */
    function _initialConvertToShares(
        uint256 assets,
        MathUpgradeable.Rounding /*rounding*/
    ) internal view virtual returns (uint256 shares) {
        return assets;
    }

    /**
     * @dev Internal conversion function (from shares to assets) with support for rounding direction.
     */
    function _convertToAssets(uint256 shares, MathUpgradeable.Rounding rounding) internal view virtual returns (uint256 assets) {
        uint256 supply = totalSupply();
        return
            (supply == 0) ? _initialConvertToAssets(shares, rounding) : shares.mulDiv(totalAssets(), supply, rounding);
    }

    /**
     * @dev Internal conversion function (from shares to assets) to apply when the vault is empty.
     *
     * NOTE: Make sure to keep this function consistent with {_initialConvertToShares} when overriding it.
     */
    function _initialConvertToAssets(
        uint256 shares,
        MathUpgradeable.Rounding /*rounding*/
    ) internal view virtual returns (uint256 assets) {
        return shares;
    }

    /**
     * @dev Deposit/mint common workflow.
     */
    function _deposit(
        address caller,
        address receiver,
        uint256 assets,
        uint256 shares
    ) internal virtual {
        // If _asset is ERC777, `transferFrom` can trigger a reenterancy BEFORE the transfer happens through the
        // `tokensToSend` hook. On the other hand, the `tokenReceived` hook, that is triggered after the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer before we mint so that any reentrancy would happen before the
        // assets are transferred and before the shares are minted, which is a valid state.
        // slither-disable-next-line reentrancy-no-eth
        SafeERC20Upgradeable.safeTransferFrom(_asset, caller, address(this), assets);
        _mint(receiver, shares);

        emit Deposit(caller, receiver, assets, shares);
    }

    /**
     * @dev Withdraw/redeem common workflow.
     */
    function _withdraw(
        address caller,
        address receiver,
        address owner,
        uint256 assets,
        uint256 shares
    ) internal virtual {
        if (caller != owner) {
            _spendAllowance(owner, caller, shares);
        }

        // If _asset is ERC777, `transfer` can trigger a reentrancy AFTER the transfer happens through the
        // `tokensReceived` hook. On the other hand, the `tokensToSend` hook, that is triggered before the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer after the burn so that any reentrancy would happen after the
        // shares are burned and after the assets are transferred, which is a valid state.
        _burn(owner, shares);
        SafeERC20Upgradeable.safeTransfer(_asset, receiver, assets);

        emit Withdraw(caller, receiver, owner, assets, shares);
    }

    /**
     * @dev Checks if vault is "healthy" in the sense of having assets backing the circulating shares.
     */
    function _isVaultCollateralized() private view returns (bool) {
        return totalAssets() > 0 || totalSupply() == 0;
    }

    /**
     * @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 (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../extensions/draft-IERC20PermitUpgradeable.sol";
import "../../../utils/AddressUpgradeable.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 SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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(
        IERC20Upgradeable 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));
        }
    }

    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable 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 (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

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

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

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.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSetUpgradeable {
    // 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) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // 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;

        /// @solidity memory-safe-assembly
        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 in 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;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.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 Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

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

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions 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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/Clones.sol)

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create(0, 0x09, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create2(0, 0x09, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(add(ptr, 0x38), deployer)
            mstore(add(ptr, 0x24), 0x5af43d82803e903d91602b57fd5bf3ff)
            mstore(add(ptr, 0x14), implementation)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73)
            mstore(add(ptr, 0x58), salt)
            mstore(add(ptr, 0x78), keccak256(add(ptr, 0x0c), 0x37))
            predicted := keccak256(add(ptr, 0x43), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(address implementation, bytes32 salt)
        internal
        view
        returns (address predicted)
    {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

    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));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        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 (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

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

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @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 Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

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.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
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) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // 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;

        /// @solidity memory-safe-assembly
        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 in 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;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/structs/EnumerableSetUpgradeable.sol";
import "./IAuthority.sol";

/**
 * @title Authority Whitelist smart contract
 * @notice this contract manages a whitelists for all the admins, borrowers and lenders
 */
contract Authority is OwnableUpgradeable, IAuthority {
    using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;

    event BorrowerAdded(address indexed actor, address indexed borrower);
    event BorrowerRemoved(address indexed actor, address indexed borrower);
    event LenderAdded(address indexed actor, address indexed lender);
    event LenderRemoved(address indexed actor, address indexed lender);
    event AdminAdded(address indexed actor, address indexed admin);
    event AdminRemoved(address indexed actor, address indexed admin);

    EnumerableSetUpgradeable.AddressSet whitelistedBorrowers;
    EnumerableSetUpgradeable.AddressSet whitelistedLenders;
    EnumerableSetUpgradeable.AddressSet admins;

    /**
     * @notice Restricts function execution to the contract owner or admins
     * @dev Throws an error if the caller is not the owner or admin
     */
    modifier onlyOwnerOrAdmin() {
        require(owner() == msg.sender || admins.contains(msg.sender), "Authority: caller is not the owner or admin");
        _;
    }

    /// @dev initializer
    function initialize() external initializer {
        __Ownable_init();
    }

    constructor() {
        _disableInitializers();
    }

    /**
     * @notice adds borrower address to the whitelist.
     * @param a address to add to the whitelist
     * @dev can only be called by the contract owner or admins
     */
    function addBorrower(address a) external onlyOwnerOrAdmin {
        if (whitelistedBorrowers.add(a)) {
            emit BorrowerAdded(msg.sender, a);
        }
    }

    /**
     * @notice removes borrower address from the whitelist.
     * @param a address to remove from the whitelist
     * @dev can only be called by the contract owner or admins
     */
    function removeBorrower(address a) external onlyOwnerOrAdmin {
        if (whitelistedBorrowers.remove(a)) {
            emit BorrowerRemoved(msg.sender, a);
        }
    }

    /**
     * @notice checks if the borrower address is in the whitelist.
     * @param a address to check
     * @return true if the address is in the whitelist
     */
    function isWhitelistedBorrower(address a) external view returns (bool) {
        return whitelistedBorrowers.contains(a);
    }

    /**
     * @notice returns array of all whitelisted borrower addresses
     *
     */
    function allBorrowers() external view returns (address[] memory) {
        return whitelistedBorrowers.values();
    }

    /**
     * @notice adds lenders address to the whitelist.
     * @param lender address to add to the whitelist
     */
    function addLender(address lender) external onlyOwnerOrAdmin {
        if (whitelistedLenders.add(lender)) {
            emit LenderAdded(msg.sender, lender);
        }
    }

    /**
     * @notice removes lenders address from the whitelist.
     * @param lender address to remove from the whitelist
     */
    function removeLender(address lender) external onlyOwnerOrAdmin {
        if (whitelistedLenders.remove(lender)) {
            emit LenderRemoved(msg.sender, lender);
        }
    }

    /**
     * @notice checks if the lender address is in the whitelist.
     * @param lender address to check
     * @return true if the address is in the whitelist
     */
    function isWhitelistedLender(address lender) external view returns (bool) {
        return whitelistedLenders.contains(lender);
    }

    /// @notice returns array of all whitelisted lender addresses
    function allLenders() external view returns (address[] memory) {
        return whitelistedLenders.values();
    }

    /**
     * @notice adds admin address to the list.
     * @param newAdmin address to add to the list
     */
    function addAdmin(address newAdmin) external onlyOwnerOrAdmin {
        if (admins.add(newAdmin)) {
            emit AdminAdded(msg.sender, newAdmin);
        }
    }

    /**
     * @notice removes admin address from the list.
     * @param admin address to remove from the list
     */
    function removeAdmin(address admin) external onlyOwnerOrAdmin {
        if (admins.remove(admin)) {
            emit AdminRemoved(msg.sender, admin);
        }
    }

    /**
     * @notice checks if the admin in the list.
     * @param a address to check
     * @return true if the address is in the list
     */
    function isAdmin(address a) external view returns (bool) {
        return admins.contains(a);
    }

    /**
     * @notice returns array of all admin addresses
     */
    function allAdmins() external view returns (address[] memory) {
        return admins.values();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "./IAuthority.sol";

/**
 * @title Authority Whitelist smart contract
 * @notice this contract manages a whitelists for all the admins, borrowers and lenders
 */
abstract contract AuthorityAware is OwnableUpgradeable {
    using EnumerableSet for EnumerableSet.AddressSet;

    IAuthority public authority;

    bytes32[50] private __gaps;

    modifier onlyOwnerOrAdmin() {
        _onlyOwnerOrAdmin();
        _;
    }

    function _onlyOwnerOrAdmin() internal view {
        require(
            owner() == msg.sender || authority.isAdmin(msg.sender),
            "AA:OA" // "AuthorityAware: caller is not the owner or admin"
        );
    }

    modifier onlyLender() { // only whitelisted lender
        require(
            authority.isWhitelistedLender(msg.sender),
            "AA:L" // "AuthorityAware: caller is not a whitelisted lender"
        );
        _;
    }

    modifier onlyWhitelisted() {
        _onlyWhitelisted();
        _;
    }

    function _onlyWhitelisted() internal view {
        require(
            owner() == msg.sender ||
                authority.isWhitelistedBorrower(msg.sender) ||
                authority.isWhitelistedLender(msg.sender) ||
                authority.isAdmin(msg.sender),
            "AA:W" // "AuthorityAware: caller is not a whitelisted borrower or lender"
        );
    }

    function __AuthorityAware__init(address _authority) internal {
        authority = IAuthority(_authority);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

/**
 * @title Authority Whitelist smart contract interface
 * @notice this contract manages a whitelists for all the admins, borrowers and lenders
 */
interface IAuthority {
    function isWhitelistedBorrower(address a) external view returns (bool);

    function isWhitelistedLender(address a) external view returns (bool);

    function isAdmin(address a) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts/proxy/Clones.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";

import "../authority/AuthorityAware.sol";
import "../pool/LendingPool.sol";

contract PoolFactory is AuthorityAware {
    using Math for uint;

    struct PoolRecord {
        string name;
        string tokenName;
        address poolAddress;
        address firstTrancheVaultAddress;
        address secondTrancheVaultAddress;
        address poolImplementationAddress;
        address trancheVaultImplementationAddress;
    }

    uint private constant WAD = 10 ** 18;

    event PoolCloned(address indexed addr, address implementationAddress);
    event TrancheVaultCloned(address indexed addr, address implementationAddress);
    event PoolDeployed(address indexed deployer, PoolRecord record);

    address public poolImplementationAddress;
    address public trancheVaultImplementationAddress;

    PoolRecord[] public poolRegistry;

    address public feeSharingContractAddress;

    /// @dev we need to track a nonce as salt for each implementation
    mapping(address => uint256) public nonces;
    mapping(address => bool) public prevDeployedTranche;

    function initialize(address _authority) public initializer {
        __Ownable_init();
        __AuthorityAware__init(_authority);
    }

    constructor() {
        _disableInitializers();
    }

    /// @notice it should be expressed that updating implemetation will make nonces at prior implementation stale
    /// @dev sets implementation for future pool deployments
    function setPoolImplementation(address implementation) external onlyOwnerOrAdmin {
        poolImplementationAddress = implementation;
    }

    /// @dev sets implementation for future tranche vault deployments
    function setTrancheVaultImplementation(address implementation) external onlyOwnerOrAdmin {
        trancheVaultImplementationAddress = implementation;
    }

    function setFeeSharingContractAddress(address implementation) external onlyOwnerOrAdmin {
        feeSharingContractAddress = implementation;
    }

    /// @dev returns last deployed pool record
    function lastDeployedPoolRecord() external view returns (PoolRecord memory p) {
        p = poolRegistry[poolRegistry.length - 1];
    }

    /// @dev removes all the pool records from storage
    function clearPoolRecords() external onlyOwnerOrAdmin {
        delete poolRegistry;
    }

    /// @dev gets the length of the pool of records 
    function poolRecordsLength() external view returns (uint) {
        return poolRegistry.length;
    }

    /** @dev Deploys a clone of implementation as a new pool.
     * . See {LendingPool-initialize}
     */
    function deployPool(
        LendingPool.LendingPoolParams calldata params,
        uint[][] calldata fundingSplitWads
    ) external onlyOwner returns (address) {
        // validate wad
        uint256 wadMax;
        uint256 wadMin;
        for(uint256 i = 0; i < fundingSplitWads.length; i++) {
            require(fundingSplitWads[i].length == 2, "LP026 - bad fundingSplitWads");
            wadMax += fundingSplitWads[i][0];
            wadMin += fundingSplitWads[i][1];
        }
        require(wadMax == 1e18, "LP024 - bad max wad");
        require(wadMin == 1e18, "LP027 - bad min wad");

        address poolAddress = _clonePool();

        address[] memory trancheVaultAddresses = _deployTrancheVaults(
            params,
            fundingSplitWads,
            poolAddress,
            _msgSender()
        );

        initializePoolAndCreatePoolRecord(poolAddress, params, trancheVaultAddresses, feeSharingContractAddress);

        return poolAddress;
    }

    function _clonePool() internal onlyOwner returns (address poolAddress) {
        address impl = poolImplementationAddress;
        poolAddress = Clones.cloneDeterministic(impl, bytes32(nonces[impl]++));
        emit PoolCloned(poolAddress, poolImplementationAddress);
    }

    function nextLender() public view returns(address) {
        return nextAddress(poolImplementationAddress);
    }

    function nextLenders() public view returns(address[4] memory lenders) {
        address impl = poolImplementationAddress;
        for(uint256 i = 0; i < lenders.length; i++) {
            lenders[i] = Clones.predictDeterministicAddress(impl, bytes32(nonces[impl] + i));
        }
    }

    function nextTranches() public view returns(address[8] memory lenders) {
        address impl = trancheVaultImplementationAddress;
        for(uint256 i = 0; i < lenders.length; i++) {
            lenders[i] = Clones.predictDeterministicAddress(impl, bytes32(nonces[impl] + i));
        }
    }

    function nextAddress(address impl) public view returns(address) {
        return Clones.predictDeterministicAddress(impl, bytes32(nonces[impl] + 1));
    }


    function _deployTrancheVaults(
        LendingPool.LendingPoolParams calldata params,
        uint[][] calldata fundingSplitWads,
        address poolAddress,
        address ownerAddress
    ) internal onlyOwner returns (address[] memory trancheVaultAddresses) {
        require(params.tranchesCount > 0, "Error TrancheCount must be gt 0");
        trancheVaultAddresses = new address[](params.tranchesCount);

        for (uint8 i; i < params.tranchesCount; ++i) {
            address impl = trancheVaultImplementationAddress;
            trancheVaultAddresses[i] = Clones.cloneDeterministic(impl,  bytes32(nonces[impl]++));

            emit TrancheVaultCloned(trancheVaultAddresses[i], impl);
            prevDeployedTranche[trancheVaultAddresses[i]] = true;

            TrancheVault(trancheVaultAddresses[i]).initialize(
                poolAddress,
                i,
                params.minFundingCapacity.mulDiv(fundingSplitWads[i][1], WAD),
                params.maxFundingCapacity.mulDiv(fundingSplitWads[i][0], WAD),
                string(abi.encodePacked(params.name, " Tranche ", Strings.toString(uint(i)), " Token")),
                string(abi.encodePacked("tv", Strings.toString(uint(i)), params.token)),
                params.stableCoinContractAddress,
                address(authority)
            );
            TrancheVault(trancheVaultAddresses[i]).transferOwnership(ownerAddress);
        }
    }

    function initializePoolAndCreatePoolRecord(
        address poolAddress,
        LendingPool.LendingPoolParams calldata params,
        address[] memory trancheVaultAddresses,
        address _feeSharingContractAddress
    ) public onlyOwner {
        LendingPool(poolAddress).initialize(
            params,
            trancheVaultAddresses,
            _feeSharingContractAddress,
            address(authority),
            address(this)
        );
        Ownable(poolAddress).transferOwnership(_msgSender());

        PoolRecord memory record = PoolRecord(
            params.name,
            params.token,
            poolAddress,
            trancheVaultAddresses[0],
            trancheVaultAddresses.length > 1 ? trancheVaultAddresses[1] : address(0),
            poolImplementationAddress,
            trancheVaultImplementationAddress
        );
        poolRegistry.push(record);

        emit PoolDeployed(_msgSender(), record);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

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

interface IFeeSharing {
    function distributeFees() external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

/// @notice interface for lending pool
/// This is not the full interface, rather a bare mininum to connect other contracts to the pool
interface ILendingPool {
    function onTrancheDeposit(uint8 trancheId, address depositorAddress, uint amount) external;

    function onTrancheWithdraw(uint8 trancheId, address depositorAddress, uint amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "./LendingPool.sol";
import "../vaults/TrancheVault.sol";
import "../authority/Authority.sol";

library PoolCalculations {
    uint constant WAD = 10 ** 18;
    uint constant YEAR = 365 days;

    function _wadPow(uint _xWad, uint _n) internal pure returns (uint) {
        uint xWad = _xWad;
        uint n = _n;
        uint result = n % 2 != 0 ? xWad : WAD;

        for (n /= 2; n != 0; n /= 2) {
            xWad = (xWad * xWad) / WAD;

            if (n % 2 != 0) {
                result = (result * xWad) / WAD;
            }
        }

        return result;
    }

    function poolBalanceThreshold(LendingPool lendingPool) public view returns (uint) {
        uint borrowedAssets = lendingPool.borrowedAssets();

        uint borrowerTotalInterestRateWad = lendingPool.borrowerTotalInterestRateWad();

        uint repaymentRecurrenceDays = lendingPool.repaymentRecurrenceDays();

        uint gracePeriodDays = lendingPool.gracePeriodDays();

        uint firstLossAssets = lendingPool.firstLossAssets();

        uint dailyBorrowerInterestAmount = (borrowedAssets * borrowerTotalInterestRateWad) / WAD / 365;

        uint interestGoDownAmount = (repaymentRecurrenceDays + gracePeriodDays) * dailyBorrowerInterestAmount;

        if (interestGoDownAmount > firstLossAssets) {
            return 0;
        }

        uint threshold = firstLossAssets - interestGoDownAmount;

        return threshold;
    }

    function poolBalance(LendingPool lendingPool) public view returns (uint) {
        uint firstLossAssets = lendingPool.firstLossAssets();
        uint borrowerInterestRepaid = lendingPool.borrowerInterestRepaid();
        uint allLendersInterestByDate = lendingPool.allLendersInterestByDate();

        uint positiveBalance = firstLossAssets + borrowerInterestRepaid;
        if (allLendersInterestByDate > positiveBalance) {
            return 0;
        }
        return positiveBalance - allLendersInterestByDate;
    }

    function borrowerPenaltyAmount(LendingPool lendingPool) public view returns (uint) {
        uint poolBalance = lendingPool.poolBalance();

        uint poolBalanceThreshold = lendingPool.poolBalanceThreshold();

        uint collectedAssets = lendingPool.collectedAssets();

        uint allLendersEffectiveAprWad = lendingPool.allLendersEffectiveAprWad();

        uint penaltyRateWad = lendingPool.penaltyRateWad();

        if (poolBalance >= poolBalanceThreshold) {
            return 0;
        }

        uint dailyLendersInterestAmount = (collectedAssets * allLendersEffectiveAprWad) / WAD / 365;

        uint balanceDifference = poolBalanceThreshold - poolBalance;

        uint daysDelinquent = balanceDifference / dailyLendersInterestAmount;

        if (daysDelinquent == 0) {
            return 0;
        }

        uint penaltyCoefficientWad = _wadPow(WAD + penaltyRateWad, daysDelinquent);

        uint penalty = (balanceDifference * penaltyCoefficientWad) / WAD - balanceDifference;

        return penalty;
    }

    function borrowerExpectedInterest(
        uint collectedAssets,
        uint borrowerAdjustedInterestRateWad
    ) public pure returns (uint) {
        return (collectedAssets * borrowerAdjustedInterestRateWad) / WAD;
    }

    function borrowerOutstandingInterest(
        uint borrowerInterestRepaid,
        uint borrowerExpectedInterest
    ) public pure returns (uint) {
        if (borrowerInterestRepaid > borrowerExpectedInterest) {
            return 0;
        }
        return borrowerExpectedInterest - borrowerInterestRepaid;
    }

    function borrowerExcessSpread(LendingPool lendingPool) public view returns (uint) {
        uint borrowerInterestRepaid = lendingPool.borrowerInterestRepaid();
        uint allLendersInterest = lendingPool.allLendersInterest();
        uint borrowerExpectedInterest = lendingPool.borrowerExpectedInterest();
        uint protocolFeeWad = lendingPool.protocolFeeWad();

        if (borrowerOutstandingInterest(borrowerInterestRepaid, borrowerExpectedInterest) > 0) {
            return 0;
        }
        uint fees = (borrowerExpectedInterest * protocolFeeWad) / WAD;
        return borrowerInterestRepaid - allLendersInterest - fees;
    }

    function borrowerAdjustedInterestRateWad(
        uint borrowerTotalInterestRateWad,
        uint lendingTermSeconds
    ) public pure returns (uint adj) {
        return (borrowerTotalInterestRateWad * lendingTermSeconds) / YEAR;
    }

    function lenderEffectiveAprByTrancheWad(
        LendingPool lendingPool,
        address lenderAddress,
        uint8 trancheId
    ) public view returns (uint) {
        uint stakedAssets = lendingPool.lenderStakedTokensByTranche(lenderAddress, trancheId);
        uint lockedPlatformTokens = lendingPool.lenderPlatformTokensByTrancheLocked(lenderAddress, trancheId);
        uint trancheBoostRatio = lendingPool.trancheBoostRatios(trancheId);
        uint trancheAPRWad = lendingPool.trancheAPRsWads(trancheId);
        uint trancheBoostedAPRWad = lendingPool.trancheBoostedAPRsWads(trancheId);

        if (stakedAssets == 0) {
            return 0;
        }
        uint boostedAssets = lockedPlatformTokens / trancheBoostRatio;
        if (boostedAssets > stakedAssets) {
            boostedAssets = stakedAssets;
        }
        uint unBoostedAssets = stakedAssets - boostedAssets;
        uint weightedAverage = (unBoostedAssets * trancheAPRWad + boostedAssets * trancheBoostedAPRWad) / stakedAssets;
        return weightedAverage;
    }

    function lenderRewardsByTrancheGeneratedByDate(
        LendingPool lendingPool,
        address lenderAddress,
        uint8 trancheId
    ) public view returns (uint) {
        uint fundedAt = lendingPool.fundedAt();
        if (fundedAt == 0) {
            return 0;
        }
        uint lenderDepositedAssets = lendingPool.lenderDepositedAssetsByTranche(lenderAddress, trancheId);
        uint lenderEffectiveApr = lendingPool.lenderEffectiveAprByTrancheWad(lenderAddress, trancheId);
        uint lendingTermSeconds = lendingPool.lendingTermSeconds();

        uint secondsElapsed = block.timestamp - fundedAt;
        if (secondsElapsed > lendingTermSeconds) {
            secondsElapsed = lendingTermSeconds;
        }
        return (lenderDepositedAssets * lenderEffectiveApr * secondsElapsed) / (YEAR * WAD);
    }

    function lenderTotalExpectedRewardsByTranche(
        uint lenderDepositedAssets,
        uint lenderEffectiveApr,
        uint lendingTermSeconds
    ) public pure returns (uint) {
        return (lenderDepositedAssets * lenderEffectiveApr * lendingTermSeconds) / (YEAR * WAD);
    }

    function lenderTotalAprWad(LendingPool lendingPool, address lenderAddress) public view returns (uint) {
        uint256 tranchesCount = lendingPool.tranchesCount();

        uint weightedApysWad = 0;
        uint totalAssets = 0;
        for (uint8 i; i < tranchesCount; i++) {
            uint staked = lendingPool.lenderStakedTokensByTranche(lenderAddress, i);
            totalAssets += staked;
            weightedApysWad += (lendingPool.lenderEffectiveAprByTrancheWad(lenderAddress, i) * staked);
        }

        if (totalAssets == 0) {
            return 0;
        }

        return weightedApysWad / totalAssets;
    }

    function allLendersEffectiveAprWad(LendingPool lendingPool, uint256 tranchesCount) public view returns (uint) {
        uint weightedSum = 0;
        uint totalStakedAssets = 0;
        for (uint8 trancheId; trancheId < tranchesCount; trancheId++) {
            uint stakedAssets = lendingPool.s_totalStakedAssetsByTranche(trancheId);
            totalStakedAssets += stakedAssets;

            uint boostedAssets = lendingPool.s_totalLockedPlatformTokensByTranche(trancheId) /
                lendingPool.trancheBoostRatios(trancheId);
            if (boostedAssets > stakedAssets) {
                boostedAssets = stakedAssets;
            }
            uint unBoostedAssets = stakedAssets - boostedAssets;

            weightedSum += unBoostedAssets * lendingPool.trancheAPRsWads(trancheId);
            weightedSum += boostedAssets * lendingPool.trancheBoostedAPRsWads(trancheId);
        }

        return weightedSum / totalStakedAssets;
    }

    function allLendersInterestByDate(LendingPool lendingPool) public view returns (uint) {
        uint256 fundedAt = lendingPool.fundedAt();
        uint256 lendingTermSeconds = lendingPool.lendingTermSeconds();
        if (fundedAt == 0 || block.timestamp <= fundedAt) {
            return 0;
        }
        uint time = block.timestamp < fundedAt + lendingTermSeconds ? block.timestamp : fundedAt + lendingTermSeconds;
        uint elapsedTime = time - fundedAt;
        return (lendingPool.allLendersInterest() * elapsedTime) / lendingTermSeconds;
    }

    function trancheVaultContracts(LendingPool lendingPool) public view returns (TrancheVault[] memory contracts) {
        uint256 trancheCount = lendingPool.tranchesCount();
        contracts = new TrancheVault[](trancheCount);

        for (uint i; i < contracts.length; ++i) {
            contracts[i] = TrancheVault(lendingPool.trancheVaultAddresses(i));
        }
    }

    function validateInitParams(
        LendingPool.LendingPoolParams calldata params,
        address[] calldata _trancheVaultAddresses,
        address _feeSharingContractAddress,
        address _authorityAddress
    ) public view {
        require(params.stableCoinContractAddress != address(0), "LP005"); // "LendingPool: stableCoinContractAddress empty"

        require(params.minFundingCapacity > 0, "LP006"); // "LendingPool: minFundingCapacity == 0"
        require(params.maxFundingCapacity > 0, "LP007"); // "LendingPool: maxFundingCapacity == 0"
        require(
            params.maxFundingCapacity >= params.minFundingCapacity,
            "LP008" // "LendingPool: maxFundingCapacity < minFundingCapacity"
        );

        require(params.fundingPeriodSeconds > 0, "LP009"); // "LendingPool: fundingPeriodSeconds == 0"
        require(params.lendingTermSeconds > 0, "LP010"); // "LendingPool: lendingTermSeconds == 0"
        require(params.borrowerAddress != address(0), "LP011"); // "LendingPool: borrowerAddress empty"
        require(Authority(_authorityAddress).isWhitelistedBorrower(params.borrowerAddress), "LP023");
        require(params.borrowerTotalInterestRateWad > 0, "LP012"); // "LendingPool: borrower interest rate = 0%"
        require(params.protocolFeeWad > 0, "LP013"); // "LendingPool: protocolFee == 0%"
        require(params.penaltyRateWad > 0, "LP014"); // "LendingPool: penaltyRate == 0"

        require(params.tranchesCount > 0, "LP015"); // "LendingPool: tranchesCount == 0"
        require(_trancheVaultAddresses.length == params.tranchesCount, "LP016"); // "LendingPool: trancheAddresses length"
        require(params.trancheAPRsWads.length == params.tranchesCount, "LP017"); // "LP001");// "LendingPool: tranche APRs length"
        require(
            params.trancheBoostedAPRsWads.length == params.tranchesCount,
            "LP018" // "LendingPool: tranche Boosted APRs length"
        );
        require(
            params.trancheBoostedAPRsWads.length == params.tranchesCount,
            "LP019" // "LendingPool: tranche Coverage APRs length"
        );

        for (uint i; i < params.tranchesCount; ++i) {
            require(params.trancheAPRsWads[i] > 0, "tranche APRs == 0");
            require(
                params.trancheBoostedAPRsWads[i] >= params.trancheAPRsWads[i],
                "LP020" // "LendingPool: tranche boosted APRs < tranche APRs"
            );
        }

        require(_feeSharingContractAddress != address(0), "LP021"); // "LendingPool: feeSharingAddress empty"
        require(_authorityAddress != address(0), "LP022"); // "LendingPool: authorityAddress empty"
    }

    function validateWad(uint256[] memory ints) external pure {
        for (uint256 i = 0; i < ints.length; i++) {
            require(ints[i] <= 1e18, "LP024 - bad wad");
        }
    }

    function setInitializer(
        LendingPool.LendingPoolParams calldata params,
        string storage name,
        string storage token,
        uint[] storage trancheAPRsWads,
        uint[] storage trancheBoostedAPRsWads,
        uint[] storage trancheBoostRatios,
        uint[] storage trancheCoveragesWads
    ) public {
        bytes memory nameBytes = bytes(params.name);
        bytes memory tokenBytes = bytes(params.token);

        for (uint i = 0; i < nameBytes.length; i++) {
            bytes(name)[i] = nameBytes[i];
        }

        for (uint i = 0; i < tokenBytes.length; i++) {
            bytes(token)[i] = tokenBytes[i];
        }

        for (uint i = 0; i < params.trancheAPRsWads.length; i++) {
            trancheAPRsWads[i] = params.trancheAPRsWads[i];
        }

        for (uint i = 0; i < params.trancheBoostedAPRsWads.length; i++) {
            trancheBoostedAPRsWads[i] = params.trancheBoostedAPRsWads[i];
        }

        for (uint i = 0; i < params.trancheBoostRatios.length; i++) {
            trancheBoostRatios[i] = params.trancheBoostRatios[i];
        }

        for (uint i = 0; i < params.trancheCoveragesWads.length; i++) {
            trancheCoveragesWads[i] = params.trancheCoveragesWads[i];
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "./LendingPool.sol";

import "../factory/PoolFactory.sol";
import "../vaults/TrancheVault.sol";

library PoolTransfers {
    function lenderEnableRollOver(
        LendingPool lendingPool,
        bool principal,
        bool rewards,
        bool platformTokens,
        address lender
    ) external {
        PoolFactory poolFactory = PoolFactory(lendingPool.poolFactoryAddress());
        uint256 lockedPlatformTokens;
        uint256 trancheCount = lendingPool.tranchesCount();
        for (uint8 trancheId; trancheId < trancheCount; trancheId++) {
            (uint256 staked, , , ) = lendingPool.s_trancheRewardables(trancheId, lender);
            TrancheVault vault = TrancheVault(lendingPool.trancheVaultAddresses(trancheId));
            (, uint256 locked, , ) = lendingPool.s_trancheRewardables(trancheId, lender);
            lockedPlatformTokens += locked;
            vault.approveRollover(lender, staked);
        }

        address[4] memory futureLenders = poolFactory.nextLenders();
        for (uint256 i = 0; i < futureLenders.length; i++) {
            SafeERC20.safeApprove(
                IERC20(lendingPool.platformTokenContractAddress()),
                futureLenders[i],
                0
            );
            // approve transfer of platform tokens
            SafeERC20.safeApprove(
                IERC20(lendingPool.platformTokenContractAddress()),
                futureLenders[i],
                lockedPlatformTokens
            );

            SafeERC20.safeApprove(
                IERC20(lendingPool.stableCoinContractAddress()),
                futureLenders[i],
                0
            );
            // approve transfer of the stablecoin contract
            SafeERC20.safeApprove(
                IERC20(lendingPool.stableCoinContractAddress()), // asume tranches.asset() == stablecoin address
                futureLenders[i],
                2 ** 256 - 1 // infinity approve because we don't know how much interest will need to be accounted for
            );
        }
    }

    function executeRollover(
        LendingPool lendingPool,
        address deadLendingPoolAddr,
        address[] memory deadTrancheAddrs,
        uint256 lenderStartIndex,
        uint256 lenderEndIndex
    ) external {
        uint256 tranchesCount = lendingPool.tranchesCount();
        require(tranchesCount == deadTrancheAddrs.length, "tranche array mismatch");
        require(
            keccak256(deadLendingPoolAddr.code) == keccak256(address(this).code),
            "rollover incampatible due to version mismatch"
        ); // upgrades to the next contract need to be set before users are allowed to rollover in the current contract
        // should do a check to ensure there aren't more than n protocols running in parallel, if this is true, the protocol will revert for reasons unknown to future devs
        LendingPool deadpool = LendingPool(deadLendingPoolAddr);
        for (uint256 i = lenderStartIndex; i <= lenderEndIndex; i++) {
            address lender = deadpool.lendersAt(i);
            LendingPool.RollOverSetting memory settings = LendingPool(deadLendingPoolAddr).lenderRollOverSettings(lender);
            if (!settings.enabled) {
                continue;
            }

            for (uint8 trancheId; trancheId < tranchesCount; trancheId++) {
                TrancheVault vault = TrancheVault(lendingPool.trancheVaultAddresses(trancheId));
                uint256 rewards = settings.rewards ? deadpool.lenderRewardsByTrancheRedeemable(lender, trancheId) : 0;
                // lenderRewardsByTrancheRedeemable will revert if the lender has previously withdrawn
                // transfer rewards from dead lender to dead tranche
                SafeERC20.safeTransferFrom(
                    IERC20(lendingPool.stableCoinContractAddress()),
                    deadLendingPoolAddr,
                    deadTrancheAddrs[trancheId],
                    rewards
                );

                vault.rollover(lender, deadTrancheAddrs[trancheId], rewards);
            }

            // ask deadpool to move platform token into this new contract
            IERC20 platoken = IERC20(lendingPool.platformTokenContractAddress());
            uint256 platokens = platoken.allowance(deadLendingPoolAddr, address(this));
            SafeERC20.safeTransferFrom(platoken, deadLendingPoolAddr, address(this), platokens);
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts-upgradeable/interfaces/IERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";

import "../authority/AuthorityAware.sol";
import "../pool/LendingPool.sol";
import "../factory/PoolFactory.sol";

contract TrancheVault is Initializable, ERC4626Upgradeable, PausableUpgradeable, AuthorityAware {
    using MathUpgradeable for uint256;

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

    mapping(address => mapping(address => uint256)) approvedRollovers;

    /* id */
    uint8 private s_id;
    event ChangeId(uint8 oldValue, uint8 newValue);

    function id() public view returns (uint8) {
        return s_id;
    }

    function _setId(uint8 newValue) internal {
        uint8 oldValue = s_id;
        s_id = newValue;
        emit ChangeId(oldValue, newValue);
    }

    /* poolAddress */
    address private s_poolAddress;
    event ChangePoolAddress(address oldValue, address newValue);

    function poolAddress() public view returns (address) {
        return s_poolAddress;
    }

    function _setPoolAddress(address newValue) internal {
        address oldValue = s_poolAddress;
        s_poolAddress = newValue;
        emit ChangePoolAddress(oldValue, newValue);
    }

    /* minFundingCapacity */
    uint256 private s_minFundingCapacity;
    event ChangeMinFundingCapacity(uint256 oldValue, uint256 newValue);

    function minFundingCapacity() public view returns (uint256) {
        return s_minFundingCapacity;
    }

    function _setMinFundingCapacity(uint256 newValue) internal {
        uint256 oldValue = s_minFundingCapacity;
        s_minFundingCapacity = newValue;
        emit ChangeMinFundingCapacity(oldValue, newValue);
    }

    /* maxFundingCapacity */
    uint256 private s_maxFundingCapacity;
    event ChangeMaxFundingCapacity(uint256 oldValue, uint256 newValue);

    function maxFundingCapacity() public view returns (uint256) {
        return s_maxFundingCapacity;
    }

    function _setMaxFundingCapacity(uint256 newValue) internal {
        uint256 oldValue = s_maxFundingCapacity;
        s_maxFundingCapacity = newValue;
        emit ChangeMaxFundingCapacity(oldValue, newValue);
    }

    /* withdrawEnabled */
    bool private s_withdrawEnabled;
    event ChangeWithdrawEnabled(address indexed actor, bool oldValue, bool newValue);

    function withdrawEnabled() public view returns (bool) {
        return s_withdrawEnabled;
    }

    function _setWithdrawEnabled(bool newValue) internal {
        bool oldValue = s_withdrawEnabled;
        s_withdrawEnabled = newValue;
        emit ChangeWithdrawEnabled(msg.sender, oldValue, newValue);
    }

    /* depositEnabled */
    bool private s_depositEnabled;
    event ChangeDepositEnabled(address indexed actor, bool oldValue, bool newValue);

    function depositEnabled() public view returns (bool) {
        return s_depositEnabled;
    }

    function _setDepositEnabled(bool newValue) internal {
        bool oldValue = s_depositEnabled;
        s_depositEnabled = newValue;
        emit ChangeDepositEnabled(msg.sender, oldValue, newValue);
    }

    /* transferEnabled */
    bool private s_transferEnabled;
    event ChangeTransferEnabled(address indexed actor, bool oldValue, bool newValue);

    function transferEnabled() public view returns (bool) {
        return s_transferEnabled;
    }

    function _setTransferEnabled(bool newValue) internal {
        bool oldValue = s_transferEnabled;
        s_transferEnabled = newValue;
        emit ChangeTransferEnabled(msg.sender, oldValue, newValue);
    }

    /* defaultRatio */
    uint private s_defaultRatioWad;
    event ChangeDefaultRatio(address indexed actor, uint oldValue, uint newValue);

    function defaultRatioWad() public view returns (uint) {
        return s_defaultRatioWad;
    }

    function isDefaulted() public view returns (bool) {
        return s_defaultRatioWad != 0;
    }

    function _setDefaultRatioWad(uint newValue) internal {
        uint oldValue = s_defaultRatioWad;
        s_defaultRatioWad = newValue;
        emit ChangeDefaultRatio(msg.sender, oldValue, newValue);
    }

    function setDefaultRatioWad(uint newValue) external onlyPool {
        _setDefaultRatioWad(newValue);
    }

    /*////////////////////////////////////////////////
      Modifiers
    ////////////////////////////////////////////////*/
    modifier onlyPool() {
        require(_msgSender() == poolAddress(), "Vault: onlyPool");
        _;
    }

    modifier onlyDeadTranche() {
        LendingPool pool = LendingPool(s_poolAddress);
        PoolFactory factory = PoolFactory(pool.poolFactoryAddress());
        require(factory.prevDeployedTranche(msg.sender), "Vault: onlyDeadTranche");
        _;
    }

    modifier onlyOwnerOrPool() {
        require(_msgSender() == poolAddress() || _msgSender() == owner(), "Vault: onlyOwnerOrPool");
        _;
    }

    modifier whenWithdrawEnabled() {
        require(withdrawEnabled(), "Vault: withdraw disabled");
        _;
    }

    modifier whenDepositEnabled() {
        require(depositEnabled(), "Vault: deposit disabled");
        _;
    }

    modifier whenTransferEnabled() {
        require(transferEnabled(), "Vault: transfer disabled");
        _;
    }

    function _isWhitelisted(address) internal virtual returns (bool) {
        return true;
    }

    /*////////////////////////////////////////////////
      CONSTRUCTOR
    ////////////////////////////////////////////////*/
    function initialize(
        address _poolAddress,
        uint8 _trancheId,
        uint _minCapacity,
        uint _maxCapacity,
        string memory _tokenName,
        string memory _symbol,
        address _underlying,
        address _authority
    ) external initializer {
        if (_minCapacity > _maxCapacity) {
            uint256 tmpMin = _minCapacity;
            _minCapacity = _maxCapacity;
            _maxCapacity = tmpMin;
        }
        require(_minCapacity <= _maxCapacity, "Vault: min > max");
        _setPoolAddress(_poolAddress);
        _setId(_trancheId);
        _setMinFundingCapacity(_minCapacity);
        _setMaxFundingCapacity(_maxCapacity);
        __ERC20_init(_tokenName, _symbol);
        __Pausable_init();
        __Ownable_init();
        __ERC4626_init(IERC20Upgradeable(_underlying));
        __AuthorityAware__init(_authority);
    }

    /*////////////////////////////////////////////////
        ADMIN METHODS
    ////////////////////////////////////////////////*/

    /** @dev enables deposits to the vault */
    function enableDeposits() external onlyOwnerOrPool {
        _setDepositEnabled(true);
    }

    /** @dev disables deposits to the vault */
    function disableDeposits() external onlyOwnerOrPool {
        _setDepositEnabled(false);
    }

    /** @dev enables withdrawals from the vault*/
    function enableWithdrawals() external onlyOwnerOrPool {
        _setWithdrawEnabled(true);
    }

    /** @dev disables withdrawals from the vault*/
    function disableWithdrawals() external onlyOwnerOrPool {
        _setWithdrawEnabled(false);
    }

    /** @dev enables vault token transfers */
    function enableTransfers() external onlyOwnerOrPool {
        _setTransferEnabled(true);
    }

    /** @dev disables vault token transfers */
    function disableTransfers() external onlyOwnerOrPool {
        _setTransferEnabled(false);
    }

    /** @dev Pauses the pool */
    function pause() external onlyOwnerOrAdmin {
        _pause();
    }

    /** @dev Unpauses the pool */
    function unpause() external onlyOwnerOrAdmin {
        _unpause();
    }

    /** @dev called by the pool in order to send assets*/
    function sendAssetsToPool(uint assets) external onlyPool whenNotPaused {
        SafeERC20Upgradeable.safeTransfer(IERC20Upgradeable(asset()), poolAddress(), assets);
    }

    /**@dev used to approve the process of the rollover to deployments that do not yet exist (executed with older tranche before creation of next tranche) */
    function approveRollover(address lender, uint256 assets) external onlyOwnerOrPool {
        LendingPool pool = LendingPool(poolAddress());
        PoolFactory factory = PoolFactory(pool.poolFactoryAddress());

        address[8] memory futureTranches = factory.nextTranches();
        for (uint256 i = 0; i < futureTranches.length; i++) {
            //super.approve(futureTranches[i], convertToShares(amount));
            approvedRollovers[lender][futureTranches[i]] = assets;
        }
    }

    function executeRolloverAndBurn(address lender, uint256 rewards) external onlyDeadTranche whenNotPaused returns (uint256) {
        TrancheVault newTranche = TrancheVault(_msgSender());
        uint256 assets = approvedRollovers[lender][address(newTranche)] + rewards;
        SafeERC20Upgradeable.safeTransfer(IERC20Upgradeable(asset()), address(newTranche), assets);
        uint256 shares = convertToAssets(assets - rewards);
        _burn(lender, shares);
        return assets;
    }

    /**@dev used to process the rollover (executed with newer tranche on deploy) */
    function rollover(address lender, address deadTrancheAddr, uint256 rewards) external onlyPool {
        TrancheVault deadTranche = TrancheVault(deadTrancheAddr);
        require(deadTranche.asset() == asset(), "Incompatible asset types");
        // transfer in capital from prev tranche
        uint256 assetsRolled = deadTranche.executeRolloverAndBurn(lender, rewards);
        IERC20Upgradeable(asset()).approve(address(this), assetsRolled);
        uint256 shares = previewDeposit(assetsRolled);
        _deposit(address(this), lender, assetsRolled, shares);
    }

    /*////////////////////////////////////////////////
        ERC-4626 Overrides
    ////////////////////////////////////////////////*/
    /** @dev Deposit asset to the pool
     *      See {IERC4626-deposit}.
     * @param assets amount of underlying asset to deposit
     * @param receiver receiver address (just set it to msg sender)
     * @return amount of pool tokens minted for the deposit
     */
    function deposit(
        uint256 assets,
        address receiver
    ) public virtual override whenNotPaused onlyLender whenDepositEnabled returns (uint256) {
        return super.deposit(assets, receiver);
    }

    /** @dev See {IERC4626-mint} */
    function mint(
        uint256 shares,
        address receiver
    ) public virtual override whenNotPaused onlyLender whenDepositEnabled returns (uint256) {
        return super.mint(shares, receiver);
    }

    /** @dev Withdraw principal from the pool
     * See {IERC4626-withdraw}.
     * @param assets amount of underlying asset to withdraw
     * @param receiver address to which the underlying assets should be sent
     * @param owner owner of the principal (just use msg sender)
     * @return amount of pool tokens burned after withdrawal
     */
    function withdraw(
        uint256 assets,
        address receiver,
        address owner
    ) public override onlyLender whenNotPaused whenWithdrawEnabled returns (uint256) {
        return super.withdraw(assets, receiver, owner);
    }

    /** @dev See {IERC4626-redeem}. */
    function redeem(
        uint256 shares,
        address receiver,
        address owner
    ) public override onlyLender whenNotPaused whenWithdrawEnabled returns (uint256) {
        return super.redeem(shares, receiver, owner);
    }

    /** @dev Maximum amount of assets that the vault will accept
     *  See {IERC4626-maxDeposit}.
     *  @param . lender address (just set it to msg sender)
     *  @return maximum amount of assets that can be deposited to the pool
     */
    function maxDeposit(address) public view override returns (uint256) {
        if (paused() || !depositEnabled()) {
            return 0;
        }
        if (totalAssets() >= maxFundingCapacity()) {
            return 0;
        }
        return maxFundingCapacity() - totalAssets();
    }

    /** @dev See {IERC4626-totalAssets}. */
    function totalAssets() public view override returns (uint256) {
        return convertToAssets(totalSupply());
    }

    /** @dev See {IERC4626-maxMint}. */
    function maxMint(address) public view override returns (uint256) {
        return convertToShares(maxDeposit(msg.sender));
    }

    /** @dev See {IERC4626-maxWithdraw}. */
    function maxWithdraw(address owner) public view override returns (uint256) {
        if (paused() || !withdrawEnabled()) {
            return 0;
        }
        return _convertToAssets(balanceOf(owner), MathUpgradeable.Rounding.Down);
    }

    /** @dev See {IERC4626-maxRedeem}. */
    function maxRedeem(address owner) public view override returns (uint256) {
        if (paused() || !withdrawEnabled()) {
            return 0;
        }
        return balanceOf(owner);
    }

    /** @dev will return 1:1 */
    function _convertToShares(
        uint256 assets,
        MathUpgradeable.Rounding rounding
    ) internal view override returns (uint256 shares) {
        if (isDefaulted()) {
            return assets.mulDiv(10 ** 18, s_defaultRatioWad, rounding);
        }
        return _initialConvertToShares(assets, rounding);
    }

    /** @dev will return 1:1 */
    function _convertToAssets(
        uint256 shares,
        MathUpgradeable.Rounding rounding
    ) internal view override returns (uint256 assets) {
        if (isDefaulted()) {
            return shares.mulDiv(s_defaultRatioWad, 10 ** 18, rounding);
        }
        return _initialConvertToAssets(shares, rounding); // 1:1
    }

    function _deposit(address caller, address receiver, uint256 assets, uint256 shares) internal whenNotPaused override {
        // If _asset is ERC777, `transferFrom` can trigger a reenterancy BEFORE the transfer happens through the
        // `tokensToSend` hook. On the other hand, the `tokenReceived` hook, that is triggered after the transfer,
        // calls the vault, which is assumed not malicious.
        //
        // Conclusion: we need to do the transfer before we mint so that any reentrancy would happen before the
        // assets are transferred and before the shares are minted, which is a valid state.
        // slither-disable-next-line reentrancy-no-eth
        SafeERC20Upgradeable.safeTransferFrom(IERC20Upgradeable(asset()), caller, address(this), assets);
        _mint(receiver, shares);
        LendingPool(poolAddress()).onTrancheDeposit(id(), receiver, assets);

        emit Deposit(caller, receiver, assets, shares);
    }

    /**
     * @dev Withdraw/redeem common workflow.
     */
    function _withdraw(
        address caller,
        address receiver,
        address owner,
        uint256 assets,
        uint256 shares
    ) internal override whenNotPaused {
        if (caller != owner) {
            _spendAllowance(owner, caller, shares);
        }

        _burn(owner, shares);
        SafeERC20Upgradeable.safeTransfer(IERC20Upgradeable(asset()), receiver, assets);
        LendingPool(poolAddress()).onTrancheWithdraw(id(), owner, assets);

        emit Withdraw(caller, receiver, owner, assets, shares);
    }

    /*////////////////////////////////////////////////
        ERC20Upgradeable overrides
    ////////////////////////////////////////////////*/
    function _transfer(address, address, uint256) internal override whenNotPaused whenTransferEnabled {
        revert("Transfers are not implemented");
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {
    "contracts/pool/PoolCalculations.sol": {
      "PoolCalculations": "0xb7e9ab34ab60ef686ba9de08d1b7ab85ed88c02a"
    },
    "contracts/pool/PoolTransfers.sol": {
      "PoolTransfers": "0xe77fb404549dcfb65d82812e1dfb7b931bddd533"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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