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// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "CToken.sol";
import "ErrorReporter.sol";
import "PriceOracle.sol";
import "ComptrollerInterface.sol";
import "ComptrollerStorage.sol";
import "Unitroller.sol";
import "CErc20InterestMarketInterfaces.sol";
import "CErc721TokenInterfaces.sol";

/**
 * @title Compound's Comptroller Contract
 * @author Compound
 */
contract Comptroller is ComptrollerV8Storage, ComptrollerInterface, ComptrollerErrorReporter, ExponentialNoError {
    /// @notice Emitted when an admin supports a market
    event MarketListed(CToken cToken);

    /// @notice Emitted when an account enters a market
    event MarketEntered(CToken cToken, address account);

    /// @notice Emitted when an account exits a market
    event MarketExited(CToken cToken, address account);

    /// @notice Emitted when a collateral factor is changed by admin
    event NewCollateralFactor(CToken cToken, uint oldCollateralFactorMantissa, uint newCollateralFactorMantissa);

    /// @notice Emitted when liquidation incentive is changed by admin
    event NewLiquidationIncentive(uint oldLiquidationIncentiveMantissa, uint newLiquidationIncentiveMantissa);

    /// @notice Emitted when price oracle is changed
    event NewPriceOracle(PriceOracle oldPriceOracle, PriceOracle newPriceOracle);

    /// @notice Emitted when pause guardian is changed
    event NewPauseGuardian(address oldPauseGuardian, address newPauseGuardian);

    /// @notice Emitted when an action is paused globally
    event ActionPaused(string action, bool pauseState);

    /// @notice Emitted when an action is paused on a market
    event ActionPaused(CToken cToken, string action, bool pauseState);

    /// @notice Emitted when borrow cap for a cToken is changed
    event NewBorrowCap(CToken indexed cToken, uint newBorrowCap);

    /// @notice Emitted when borrow cap guardian is changed
    event NewBorrowCapGuardian(address oldBorrowCapGuardian, address newBorrowCapGuardian);

    /// @notice Emitted when COMP is granted by admin
    event CompGranted(address recipient, uint amount);

    /// @notice Emitted when COMP accrued for a user has been manually adjusted.
    event CompAccruedAdjusted(address indexed user, uint oldCompAccrued, uint newCompAccrued);

    /// @notice Emitted when COMP receivable for a user has been updated.
    event CompReceivableUpdated(address indexed user, uint oldCompReceivable, uint newCompReceivable);

    event InterestShortfallTopUp(address borrower, address cTokenInterestMarket, address cTokenCollateral, uint topUpAmount, uint seizeAmount);

    event LiquidateBorrow(address borrower, uint liquidatedValueTotal, address[] cTokenCollaterals, uint[] seizeTokensList);

    /// @notice The initial COMP index for a market
    uint224 public constant compInitialIndex = 1e36;

    // No collateralFactorMantissa may exceed this value
    uint internal constant collateralFactorMaxMantissa = 0.9e18; // 0.9


    /*** Reentrancy Guard ***/

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     */
    modifier nonReentrantWL() {
        if (!_checkEoaOrWL(msg.sender)) {
            revert Unauthorized();
        }
        if (!_notEntered) {
            revert Reentry();
        }
        _notEntered = false;
        _;
        _notEntered = true; // get a gas-refund post-Istanbul
    }

    constructor() {
        admin = msg.sender;
    }

    function initialize() public {
        if (msg.sender != address(this) && msg.sender != admin) {
            revert Unauthorized();
        }

        // The counter starts true to prevent changing it from zero to non-zero (i.e. smaller cost/refund)
        _notEntered = true;
    }

    /*** Assets You Are In ***/

    /**
     * @notice Returns the assets an account has entered
     * @param account The address of the account to pull assets for
     * @return A dynamic list with the assets the account has entered
     */
    function getAssetsIn(address account) external view returns (CToken[] memory) {
        CToken[] memory assetsIn = accountAssets[account];

        return assetsIn;
    }

    /**
     * @notice Returns whether the given account is entered in the given asset
     * @param account The address of the account to check
     * @param cToken The cToken to check
     * @return True if the account is in the asset, otherwise false.
     */
    function checkMembership(address account, CToken cToken) external view returns (bool) {
        return markets[address(cToken)].accountMembership[account];
    }

    /**
     * @notice When a market calls this function the account is added to this market
     * @param account The account to enter the market
     */
    function autoEnterMarkets(address account) override public {
        if (addToMarketInternal(CToken(msg.sender), account) != Error.NO_ERROR) {
            revert Unauthorized();
        }
    }

    /**
     * @notice Add assets to be included in account liquidity calculation
     * @param cTokens The list of addresses of the cToken markets to be enabled
     * @return Success indicator for whether each corresponding market was entered
     */
    function enterMarkets(address[] memory cTokens) override public returns (uint[] memory) {
        uint len = cTokens.length;

        uint[] memory results = new uint[](len);
        for (uint i = 0; i < len; i++) {
            CToken cToken = CToken(cTokens[i]);

            results[i] = uint(addToMarketInternal(cToken, msg.sender));
        }

        return results;
    }

    /**
     * @notice Add the market to the borrower's "assets in" for liquidity calculations
     * @param cToken The market to enter
     * @param borrower The address of the account to modify
     * @return Success indicator for whether the market was entered
     */
    function addToMarketInternal(CToken cToken, address borrower) internal returns (Error) {
        Market storage marketToJoin = markets[address(cToken)];

        if (!marketToJoin.isListed) {
            // market is not listed, cannot join
            return Error.MARKET_NOT_LISTED;
        }

        if (marketToJoin.accountMembership[borrower]) {
            // already joined
            return Error.NO_ERROR;
        }

        // survived the gauntlet, add to list
        // NOTE: we store these somewhat redundantly as a significant optimization
        //  this avoids having to iterate through the list for the most common use cases
        //  that is, only when we need to perform liquidity checks
        //  and not whenever we want to check if an account is in a particular market
        marketToJoin.accountMembership[borrower] = true;
        accountAssets[borrower].push(cToken);

        if (cToken.marketType() == CTokenStorage.MarketType.ERC721_MARKET) {
            accountAssetsErc721[borrower].push(cToken);
        }

        emit MarketEntered(cToken, borrower);

        return Error.NO_ERROR;
    }

    /**
     * @notice When a market calls this function the account is removed from this market
     * @param account The account to exit the market
     */
    function autoExitMarkets(address account) override public {
        if (exitFromMarketInternal(CToken(msg.sender), account) != Error.NO_ERROR) {
            revert Unauthorized();
        }
    }

    /**
     * @notice Removes asset from sender's account liquidity calculation
     * @dev Sender must not have an outstanding borrow balance in the asset,
     *  or be providing necessary collateral for an outstanding borrow.
     * @param cTokenAddress The address of the asset to be removed
     * @return Whether or not the account successfully exited the market
     */
    function exitMarket(address cTokenAddress) override external returns (uint) {
        CToken cToken = CToken(cTokenAddress);
        /* Get sender tokensHeld and amountOwed underlying from the cToken */
        (uint oErr, uint tokensHeld, uint amountOwed, , uint interestBalance) = cToken.getAccountSnapshot(msg.sender);
        if (oErr != 0) {
            revert GetAccountSnapshotFailed(oErr);
        }

        /* Fail if the sender has a borrow balance */
        if (amountOwed != 0) {
            return fail(Error.NONZERO_BORROW_BALANCE, FailureInfo.EXIT_MARKET_BALANCE_OWED);
        }

        /* Fail if the sender has an interest owed balance */
        if (interestBalance != 0) {
            return fail(Error.NONZERO_INTEREST_BALANCE, FailureInfo.EXIT_MARKET_BALANCE_OWED);
        }

        /* Fail if the sender is not permitted to redeem all of their tokens */
        uint allowed = redeemAllowedInternal(cTokenAddress, msg.sender, tokensHeld);
        if (allowed != 0) {
            return failOpaque(Error.REJECTION, FailureInfo.EXIT_MARKET_REJECTION, allowed);
        }

        return uint(exitFromMarketInternal(cToken, msg.sender));
    }

    /**
     * @notice Removes asset from sender's account liquidity calculation
     * @param cToken The address of the asset to be removed
     * @param borrower The address of the account to remove the asset from
     * @return Error Whether or not the account successfully exited the market
     */
    function exitFromMarketInternal(CToken cToken, address borrower) internal returns (Error) {
        Market storage marketToExit = markets[address(cToken)];

        if (!marketToExit.isListed) {
            // market is not listed, cannot exit
            return Error.MARKET_NOT_LISTED;
        }

        /* Return true if the sender is not already ‘in’ the market */
        if (!marketToExit.accountMembership[borrower]) {
            return Error.NO_ERROR;
        }

        /* Set cToken account membership to false */
        delete marketToExit.accountMembership[borrower];

        removeFromArray(accountAssets[borrower], cToken);

        if (cToken.marketType() == CTokenStorage.MarketType.ERC721_MARKET) {
            removeFromArray(accountAssetsErc721[borrower], cToken);
        }

        emit MarketExited(cToken, borrower);

        return Error.NO_ERROR;
    }

    function removeFromArray(CToken[] storage storedList, CToken cToken) internal {
        uint len = storedList.length;
        uint assetIndex = len;
        for (uint i = 0; i < len;) {
            if (storedList[i] == cToken) {
                assetIndex = i;
                break;
            }
            unchecked { i++; }
        }

        // We *must* have found the asset in the list or our redundant data structure is broken
        assert(assetIndex < len);

        // copy last item in list to location of item to be removed, reduce length by 1
        storedList[assetIndex] = storedList[len - 1];
        storedList.pop();
    }

    /**
     * @notice Redeems the interest accrued for the given cTokens.
     * @param lender The address of the lender from which to claim.
     * @param cTokens The list of cToken addresses to redeem interest from.
     *                Only possible for cErc721 markets.
     * @return uint[] Amount of interest redeemed for each corresponding cToken
     *                or Error.MARKET_NOT_LISTED, Error.INVALID_MARKET_TYPE for invalid markets.
     */
    function redeemAllInterest(address lender, address[] memory cTokens) override external returns (uint[] memory) {
        if (msg.sender != _interestMarket) {
            if (lender != msg.sender || !_checkEoaOrWL(msg.sender)) {
                revert Unauthorized();
            }
        }

        uint len = cTokens.length;

        uint[] memory results = new uint[](len);
        for (uint i = 0; i < len; i++) {
            if (!markets[cTokens[i]].isListed) {
                results[i] = uint(Error.MARKET_NOT_LISTED);
            } else if (CToken(cTokens[i]).marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
                results[i] = uint(Error.INVALID_MARKET_TYPE);
            } else {
                results[i] = uint(CErc721Interface(cTokens[i]).redeemInterest(lender));
            }
        }

        return results;
    }

    /**
     * @notice Topup interest shortfall of a borrower and seize collateral tokens.
     * @param borrower The borrower whose shortfall to topup
     * @param maxTopUpTokens Maximum amount of shortfall to topup (actual amount will be <= maxTopUpTokens)
     *                       The caller must have enough tokens of the interest market
     * @param cTokenCollateral The market where the collateral is held
     * @return (uint, uint) Actual topup amount, actual seize amount
     */
    function topUpInterestShortfall(address borrower, uint maxTopUpTokens, address cTokenCollateral) override external nonReentrantWL returns (uint[2] memory) {
        if (seizeGuardianPaused) {
            revert SeizePaused();
        }
        if (maxTopUpTokens == 0) {
            revert InvalidTopUpLimit();
        }

        address interestMarket_ = _interestMarket;

        CTokenInterface(interestMarket_).accrueInterest();
        if (CToken(cTokenCollateral).marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
            CTokenInterface(cTokenCollateral).accrueInterest();
        }

        for (uint i = 0; i < accountAssetsErc721[borrower].length;) {
            // redeems earned NFT market interest for the borrower, which could make their account solvent; also calls accrueInterest() internally
            CErc721Interface(address(accountAssetsErc721[borrower][i]))._redeemInterestForLiquidation(borrower);
            unchecked { i++; }
        }

        (uint err, , uint shortfallUsd) = getAccountLiquidity(borrower);
        if (err != uint(Error.TOO_LITTLE_INTEREST_RESERVE) || shortfallUsd == 0) {
            revert InsufficientShortfall(err, shortfallUsd);
        }

        if (interestMarket_ == cTokenCollateral) {
            revert SameMarket();
        }
        if (address(CToken(interestMarket_).comptroller()) != address(this)) {
            revert ComptrollerMismatch();
        }
        if (!markets[cTokenCollateral].isListed) {
            revert MarketNotListed();
        }

        // max topup amount is shortfall + 5% (unless a greater value NFT is seized)
        shortfallUsd = shortfallUsd * 105 / 100;

        (uint actualTopUpTokens, uint actualSeizeTokens) = _adjustTopUpValues(borrower, shortfallUsd, interestMarket_, cTokenCollateral);
        if (maxTopUpTokens < actualTopUpTokens) {
            revert TopUpLimitExceeded();
        }
        if (actualTopUpTokens == 0 && actualSeizeTokens != 0) {
            revert TopUpZero();
        }

        // seize tokens
        if (CTokenInterface(cTokenCollateral)._seize(msg.sender, borrower, actualSeizeTokens) != actualSeizeTokens) {
            revert SeizeFailed();
        }

        // topup interest
        if (!CToken(interestMarket_).transferFrom(msg.sender, borrower, actualTopUpTokens)) {
            revert TopUpFailed();
        }

        emit InterestShortfallTopUp(borrower, interestMarket_, cTokenCollateral, actualTopUpTokens, actualSeizeTokens);

        return [actualTopUpTokens, actualSeizeTokens];
    }

    /**
     * @notice Liquidates multiple positions in one transaction.
     * @dev cETH is liquidated using WETH.
     * @param borrower The borrower of this cToken to be liquidated
     * @param liquidatables The list of Liquidatables
     *                      If Liquidatables.amount is non-zero, we assume an ERC20 market and ignore nftIds, if zero we assume a NFT market.
     * @param cTokenCollaterals The list of cTokenCollaterals
     * @param minSeizedValue slippage protection. The adjusted (scaled) prices from the oracle are used for the value.
     * @return results uint[][] 0:x the repay amount for the liquidatables. 1:x the seize amount for the cTokenCollaterals
     */
    function batchLiquidateBorrow(address borrower, Liquidatables[] memory liquidatables, address[] memory cTokenCollaterals, uint minSeizedValue) override external nonReentrantWL returns (uint[][2] memory results) {
        if (seizeGuardianPaused) {
            revert SeizePaused();
        }

        {
            uint i;
            for (i = 0; i < liquidatables.length;) {
                if (CTokenInterface(liquidatables[i].cToken).marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
                    CTokenInterface(liquidatables[i].cToken).accrueInterest();
                }
                unchecked { i++; }
            }
            for (i = 0; i < cTokenCollaterals.length;) {
                if (CTokenInterface(cTokenCollaterals[i]).marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
                    CTokenInterface(cTokenCollaterals[i]).accrueInterest();
                }
                unchecked { i++; }
            }
            for (i = 0; i < accountAssetsErc721[borrower].length;) {
                // redeems earned NFT market interest for the borrower, which could make their account solvent; also calls accrueInterest() internally
                CErc721Interface(address(accountAssetsErc721[borrower][i]))._redeemInterestForLiquidation(borrower);
                unchecked { i++; }
            }
        }

        (uint err, uint beforeRatio) = getAccountDebtRatioWhenShortfall(borrower);
        if (err != uint(Error.NO_ERROR) || beforeRatio == 0) {
            revert InsufficientShortfall(err, beforeRatio);
        }

        results[0] = new uint[](liquidatables.length);
        results[1] = new uint[](cTokenCollaterals.length);

        PriceOracle oracle_ = oracle; 

        uint liquidatedValueTotal;
        {
            for (uint i = 0; i < liquidatables.length;) {

                if (!markets[liquidatables[i].cToken].isListed) {
                    revert MarketNotListed();
                }

                if (liquidatables[i].amount != 0) {
                    results[0][i] = CErc20Interface(liquidatables[i].cToken)._liquidateBorrow(msg.sender, borrower, liquidatables[i].amount);
                } else {
                    results[0][i] = CErc721Interface(liquidatables[i].cToken)._liquidateBorrow(msg.sender, borrower, liquidatables[i].nftIds);
                }

                uint priceMantissa = oracle_.getUnderlyingPrice(CToken(liquidatables[i].cToken));
                if (priceMantissa == 0) {
                    revert PriceError();
                }

                liquidatedValueTotal = mul_ScalarTruncateAddUInt(Exp({mantissa: priceMantissa}), results[0][i], liquidatedValueTotal);

                unchecked { i++; }
            }
            if (liquidatedValueTotal == 0) {
                revert LiquidateError();
            }
        }

        {
            uint liquidatedValueRemaining = liquidatedValueTotal;
            uint liquidatedValueExcess = 0;
            for (uint i = 0; i < cTokenCollaterals.length && liquidatedValueRemaining != 0;) {

                if (!markets[cTokenCollaterals[i]].isListed) {
                    revert MarketNotListed();
                }

                uint actualSeizeTokens;
                (liquidatedValueRemaining, liquidatedValueExcess, actualSeizeTokens) = _liquidateSeize(CTokenInterface(cTokenCollaterals[i]), liquidatedValueRemaining, borrower);

                results[1][i] = actualSeizeTokens;

                unchecked { i++; }
            }

            if (liquidatedValueRemaining != 0) {
                revert LiquidateSeizeTooLittle();
            }

            if (liquidatedValueTotal + liquidatedValueExcess < minSeizedValue) {
                revert LiquidateSeizeBellowMinValue(minSeizedValue, liquidatedValueTotal + liquidatedValueExcess);
            }

            // A non-zero liquidatedValueExcess indicates that collateral in excess of liquidationIncentive was seized,
            // which can occur with NFT collaterals. The liquidator must refund this value to the borrower. We use interestMarket
            // tokens for this, so the liquidator needs a sufficient balance to cover the excess.
            if (liquidatedValueExcess != 0) {
                CToken interestMarket_ = CToken(_interestMarket);

                uint refundTokens = liquidatedValueExcess * doubleScale /
                    oracle_.getUnderlyingPrice(interestMarket_) /
                    interestMarket_.exchangeRateCurrent();

                if (!interestMarket_.transferFrom(msg.sender, borrower, refundTokens)) {
                    revert ExcessRefundFailed();
                }
            }
        }

        /* We emit a LiquidateBorrow event */
        emit LiquidateBorrow(borrower, liquidatedValueTotal, cTokenCollaterals, results[1]);

        uint afterRatio;
        (err, afterRatio) = getAccountDebtRatioWhenShortfall(borrower);
        
        // we allow Error.TOO_LITTLE_INTEREST_RESERVE here as long as debt ratio is improved or unchanged
        if ((err != uint(Error.NO_ERROR) && err != uint(Error.TOO_LITTLE_INTEREST_RESERVE)) || afterRatio > beforeRatio) {
            revert LiquidateSeizeTooMuch();
        }

        return results;
    }

    function _liquidateSeize(CTokenInterface collateral, uint liquidatedValueRemaining, address borrower) internal returns (uint liquidatedValueRemainingNew, uint liquidatedValueExcess, uint actualSeizeTokens) {
        /* We calculate the number of collateral tokens that will be seized */
        uint seizeTokens = liquidateCalculateSeizeTokensNormed(address(collateral), liquidatedValueRemaining);

        uint borrowerBalance = collateral.balanceOf(borrower);
        if (borrowerBalance < seizeTokens) {
            // can't seize more collateral than owned by the borrower
            actualSeizeTokens = borrowerBalance;
        } else {
            actualSeizeTokens = seizeTokens;
        }

        actualSeizeTokens = collateral._seize(msg.sender, borrower, actualSeizeTokens);
        if (actualSeizeTokens == 0) {
            revert SeizeFailed();
        }

        uint actualRepayAmount = liquidatedValueRemaining;
        if (actualSeizeTokens != seizeTokens) {
            actualRepayAmount = actualRepayAmount * actualSeizeTokens / seizeTokens;
        }

        if (liquidatedValueRemaining > actualRepayAmount) {
            liquidatedValueRemainingNew = liquidatedValueRemaining - actualRepayAmount;
        } else {
            liquidatedValueExcess = actualRepayAmount - liquidatedValueRemaining;
            liquidatedValueRemainingNew = 0;
        }
    }

    /*** Policy Hooks ***/

    /**
     * @notice Checks if the account should be allowed to mint tokens in the given market
     * @param cToken The market to verify the mint against
     * @param minter The account which would get the minted tokens
     * @param mintAmount The amount of underlying being supplied to the market in exchange for tokens
     * @return 0 if the mint is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function mintAllowed(address cToken, address minter, uint mintAmount) override external returns (uint) {
        // Pausing is a very serious situation - we revert to sound the alarms
        if (mintGuardianPaused[cToken]) {
            revert MintPaused();
        }

        // Shh - currently unused
        minter;
        mintAmount;

        if (!markets[cToken].isListed) {
            return uint(Error.MARKET_NOT_LISTED);
        }

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Checks if the account should be allowed to redeem tokens in the given market
     * @param cToken The market to verify the redeem against
     * @param redeemer The account which would redeem the tokens
     * @param redeemTokens The number of cTokens to exchange for the underlying asset in the market
     * @return 0 if the redeem is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function redeemAllowed(address cToken, address redeemer, uint redeemTokens) override external returns (uint) {
        uint allowed = redeemAllowedInternal(cToken, redeemer, redeemTokens);
        if (allowed != uint(Error.NO_ERROR)) {
            return allowed;
        }

        return uint(Error.NO_ERROR);
    }

    function redeemAllowedInternal(address cToken, address redeemer, uint redeemTokens) internal view returns (uint) {
        if (!markets[cToken].isListed) {
            return uint(Error.MARKET_NOT_LISTED);
        }

        /* If the redeemer is not 'in' the market, then we can bypass the liquidity check */
        if (!markets[cToken].accountMembership[redeemer]) {
            return uint(Error.NO_ERROR);
        }

        /* Otherwise, perform a hypothetical liquidity check to guard against shortfall */
        // uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (Error err, uint[4] memory retVals) = getHypotheticalAccountLiquidityInternal(redeemer, CToken(cToken), redeemTokens, 0);
        if (err != Error.NO_ERROR) {
            return uint(err);
        }
        if (retVals[1] != 0) {
            return uint(Error.INSUFFICIENT_LIQUIDITY);
        }

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Checks if the account should be allowed to borrow the underlying asset of the given market
     * @param cToken The market to verify the borrow against
     * @param borrower The account which would borrow the asset
     * @param borrowAmount The amount of underlying the account would borrow
     * @return 0 if the borrow is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function borrowAllowed(address cToken, address borrower, uint borrowAmount) override external returns (uint) {
        // Pausing is a very serious situation - we revert to sound the alarms
        if (borrowGuardianPaused[cToken]) {
            revert BorrowPaused();
        }

        if (!markets[cToken].isListed) {
            return uint(Error.MARKET_NOT_LISTED);
        }

        Error err;
        if (!markets[cToken].accountMembership[borrower]) {
            // only cTokens may call borrowAllowed if borrower not in market
            if (msg.sender != cToken) {
                revert Unauthorized();
            }

            // attempt to add borrower to the market
            err = addToMarketInternal(CToken(msg.sender), borrower);
            if (err != Error.NO_ERROR) {
                return uint(err);
            }

            // it should be impossible to break the important invariant
            assert(markets[cToken].accountMembership[borrower]);
        }

        if (oracle.getUnderlyingPrice(CToken(cToken)) == 0) {
            return uint(Error.PRICE_ERROR);
        }


        uint borrowCap = borrowCaps[cToken];
        // Borrow cap of 0 corresponds to unlimited borrowing
        if (borrowCap != 0) {
            uint totalBorrows = CToken(cToken).totalBorrows();
            uint nextTotalBorrows = add_(totalBorrows, borrowAmount);
            if (nextTotalBorrows >= borrowCap) {
                revert BorrowCapReached();
            }
        }

        uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (err, retVals) = getHypotheticalAccountLiquidityInternal(borrower, CToken(cToken), 0, borrowAmount);
        if (err != Error.NO_ERROR) {
            return uint(err);
        }
        if (retVals[1] != 0) {
            return uint(Error.INSUFFICIENT_LIQUIDITY);
        }

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Checks if the account should be allowed to repay a borrow in the given market
     * @param cToken The market to verify the repay against
     * @param payer The account which would repay the asset
     * @param borrower The account which would borrowed the asset
     * @param repayAmount The amount of the underlying asset the account would repay
     * @return 0 if the repay is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function repayBorrowAllowed(
        address cToken,
        address payer,
        address borrower,
        uint repayAmount) override external returns (uint) {
        // Shh - currently unused
        payer;
        borrower;
        repayAmount;

        if (!markets[cToken].isListed) {
            return uint(Error.MARKET_NOT_LISTED);
        }

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Checks if the collecting of interest should be allowed to occur
     * @param cTokenInterestMarket Asset which is payed out as interest
     * @param cTokenSupplyMarket Asset which accrues interest
     * @param lender The address who would receive the tokens
     * @param interestAmount The amount of tokens to receive as interest
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function collectInterestAllowed(
        address cTokenInterestMarket,
        address cTokenSupplyMarket,
        address lender,
        uint interestAmount) override external returns (uint) {
        // Pausing is a very serious situation - we revert to sound the alarms
        if (collectInterestGuardianPaused) {
            revert CollectInterestPaused();
        }

        lender;
        interestAmount;

        if (cTokenInterestMarket != _interestMarket) {
            revert InvalidMarket();
        }

        if (!markets[cTokenSupplyMarket].isListed) {
            revert MarketNotListed();
        }

        if (CToken(cTokenInterestMarket).comptroller() != CToken(cTokenSupplyMarket).comptroller()) {
            revert ComptrollerMismatch();
        }

        if (CToken(cTokenSupplyMarket).marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
            revert WrongMarketType();
        }

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Checks if paying interest should be allowed to occur
     * @param cTokenInterestMarket Asset which is used as payment
     * @param cTokenBorrowMarket Asset which accrues interest
     * @param payer The address who would pay the tokens
     * @param payTokens The amount of tokens to pay as interest
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function payInterestAllowed(
        address cTokenInterestMarket,
        address cTokenBorrowMarket,
        address payer,
        uint payTokens) override external returns (uint) {
        // Pausing is a very serious situation - we revert to sound the alarms
        if (payInterestGuardianPaused) {
            revert PayInterestPaused();
        }

        if (cTokenInterestMarket != _interestMarket) {
            revert InvalidMarket();
        }

        if (!markets[cTokenBorrowMarket].isListed) {
            revert MarketNotListed();
        }

        if (CToken(cTokenInterestMarket).comptroller() != CToken(cTokenBorrowMarket).comptroller()) {
            revert ComptrollerMismatch();
        }

        if (CToken(cTokenBorrowMarket).marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
            revert WrongMarketType();
        }

        /* If the payer is not 'in' the market, then we can bypass the liquidity check */
        if (!markets[cTokenInterestMarket].accountMembership[payer]) {
            return uint(Error.NO_ERROR);
        }

        /* Otherwise, perform a hypothetical liquidity check to guard against shortfall */
        // uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (Error err, uint[4] memory retVals) = getHypotheticalAccountLiquidityInternal(payer, CToken(cTokenInterestMarket), payTokens, 0);
        if (err == Error.NO_ERROR) {
            if (retVals[1] != 0) {
                return uint(Error.INSUFFICIENT_LIQUIDITY);
            }
        } else if (err != Error.TOO_LITTLE_INTEREST_RESERVE) {
            return uint(err);
        }

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Checks if the account should be allowed to transfer tokens in the given market
     * @param cToken The market to verify the transfer against
     * @param src The account which sources the tokens
     * @param dst The account which receives the tokens
     * @param transferTokens The number of cTokens to transfer
     * @return 0 if the transfer is allowed, otherwise a semi-opaque error code (See ErrorReporter.sol)
     */
    function transferAllowed(address cToken, address src, address dst, uint transferTokens) override external returns (uint) {
        // Pausing is a very serious situation - we revert to sound the alarms
        if (transferGuardianPaused) {
            revert TransferPaused();
        }

        // Currently the only consideration is whether or not
        //  the src is allowed to redeem this many tokens
        uint allowed = redeemAllowedInternal(cToken, src, transferTokens);
        if (allowed != uint(Error.NO_ERROR)) {
            return allowed;
        }

        return uint(Error.NO_ERROR);
    }

    /*** Liquidity/Liquidation Calculations ***/

    /**
     * @dev Local vars for avoiding stack-depth limits in calculating account liquidity.
     *  Note that `cTokenBalance` is the number of cTokens the account owns in the market,
     *  whereas `borrowBalance` is the amount of underlying that the account has borrowed.
     */
    struct AccountLiquidityLocalVars {
        uint sumCollateral;
        uint sumBorrowPlusEffects;
        uint sumInterestOwed;
        uint interestMarketBalance;
        uint cTokenBalance;
        uint borrowBalance;
        uint interestBalance;
        uint exchangeRateMantissa;
        uint oraclePriceMantissa;
        CTokenStorage.MarketType marketType;
        bool interestTokenNeeded;
        Exp collateralFactor;
        Exp exchangeRate;
        Exp oraclePrice;
        Exp tokensToDenom;
        Exp normedExchangeRate;
    }

    /**
     * @notice Calculates the account's ratio between collateral and borrows if the account is underwater or 0 if the account is solvent.
     * @param account The account to examine
     * @return (possible error code (semi-opaque), debt ratio)
     */
    function getAccountDebtRatioWhenShortfall(address account) public view returns (uint, uint) {
        // uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (Error err, uint[4] memory retVals) = getHypotheticalAccountLiquidityInternal(account, CToken(address(0)), 0, 0);
        if (retVals[1] == 0) {
            return (uint(err), 0);
        } else if (retVals[2] == 0) {
            return (uint(err), type(uint).max);
        }
        return (uint(err), retVals[3] * expScale / retVals[2]);
    }

    /**
     * @notice Determine the current account liquidity wrt collateral requirements
     * @return (possible error code (semi-opaque),
     *          account liquidity in excess of collateral requirements,
     *          account shortfall below collateral requirements)
     */
    function getAccountLiquidity(address account) public view returns (uint, uint, uint) {
        // uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (Error err, uint[4] memory retVals) = getHypotheticalAccountLiquidityInternal(account, CToken(address(0)), 0, 0);

        return (uint(err), retVals[0], retVals[1]);
    }

    /**
     * @notice Determine the current account liquidity wrt collateral requirements
     * @return (possible error code,
     *          account liquidity in excess of collateral requirements,
     *          account shortfall below collateral requirements, 
     *          account total collateral,
     *          account total borrow + effects)
     */
    function getAccountLiquidityInternal(address account) internal view returns (Error, uint, uint, uint, uint) {
        // uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (Error err, uint[4] memory retVals) = getHypotheticalAccountLiquidityInternal(account, CToken(address(0)), 0, 0);
        return (err, retVals[0], retVals[1], retVals[2], retVals[3]);
    }

    /**
     * @notice Determine what the account liquidity would be if the given amounts were redeemed/borrowed
     * @param cTokenModify The market to hypothetically redeem/borrow in
     * @param account The account to determine liquidity for
     * @param redeemTokens The number of tokens to hypothetically redeem
     * @param borrowAmount The amount of underlying to hypothetically borrow
     * @return (possible error code (semi-opaque),
     *          hypothetical account liquidity in excess of collateral requirements,
     *          hypothetical account shortfall below collateral requirements)
     */
    function getHypotheticalAccountLiquidity(
        address account,
        address cTokenModify,
        uint redeemTokens,
        uint borrowAmount) public view returns (uint, uint, uint) {
        // uint[4] memory retVals; /* liquidity, shortfall, sumCollateral, sumBorrowPlusEffects */
        (Error err, uint[4] memory retVals) = getHypotheticalAccountLiquidityInternal(account, CToken(cTokenModify), redeemTokens, borrowAmount);
        return (uint(err), retVals[0], retVals[1]);
    }

    /**
     * @notice Determine what the account liquidity would be if the given amounts were redeemed/borrowed
     * @param account The account to determine liquidity for
     * @param cTokenModify The market to hypothetically redeem/borrow in
     * @param redeemTokens The number of tokens to hypothetically redeem
     * @param borrowAmount The amount of underlying to hypothetically borrow
     * @dev Note that we calculate the exchangeRateStored for each collateral cToken using stored data,
     *  without calculating accumulated interest.
     * @return (possible error code,
     *          hypothetical account liquidity in excess of collateral requirements,
     *          hypothetical account shortfall below collateral requirements,
     *          hypothetical account USD valued sum of all collaterals,
     *          hypothetical account USD valued sum of all borrows + effects)
     */
    function getHypotheticalAccountLiquidityInternal(
        address account,
        CToken cTokenModify,
        uint redeemTokens,
        uint borrowAmount) internal view returns (Error, uint[4] memory) {

        AccountLiquidityLocalVars memory vars; // Holds all our calculation results
        uint oErr;

        PriceOracle oracle_ = oracle;

        address interestMarket_ = _interestMarket;

        // For each asset the account is in
        CToken[] memory assets = accountAssets[account];
        for (uint i = 0; i < assets.length; i++) {
            CToken asset = assets[i];

            // Read the balances and exchange rate from the cToken
            // vars.interestBalance is denominated in interest market tokens
            (oErr, vars.cTokenBalance, vars.borrowBalance, vars.exchangeRateMantissa, vars.interestBalance) = asset.getAccountSnapshot(account);
            if (oErr != 0) { // semi-opaque error code, we assume NO_ERROR == 0 is invariant between upgrades
                return (Error.SNAPSHOT_ERROR, [uint(0), 0, 0, 0]);
            }
            vars.collateralFactor = Exp({mantissa: markets[address(asset)].collateralFactorMantissa});
            vars.exchangeRate = Exp({mantissa: vars.exchangeRateMantissa});

            // Get the normalized price of the asset
            vars.oraclePriceMantissa = oracle_.getUnderlyingPrice(asset);
            if (vars.oraclePriceMantissa == 0) {
                return (Error.PRICE_ERROR, [uint(0), 0, 0, 0]);
            }
            vars.oraclePrice = Exp({mantissa: vars.oraclePriceMantissa});

            vars.normedExchangeRate = mul_(vars.exchangeRate, vars.oraclePrice);

            // Pre-compute a conversion factor from tokens -> usd (normalized price value)
            vars.tokensToDenom = mul_(vars.collateralFactor, vars.normedExchangeRate);

            // sumCollateral += tokensToDenom * cTokenBalance
            vars.sumCollateral = mul_ScalarTruncateAddUInt(vars.tokensToDenom, vars.cTokenBalance, vars.sumCollateral);

            // sumBorrowPlusEffects += oraclePrice * borrowBalance
            vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(vars.oraclePrice, vars.borrowBalance, vars.sumBorrowPlusEffects);

            vars.marketType = asset.marketType();

            if (vars.marketType == CTokenStorage.MarketType.ERC721_MARKET) {
                // nft market
                vars.sumInterestOwed = vars.sumInterestOwed + vars.interestBalance;
            } else if (address(asset) == interestMarket_) {
                // nft interest market
                vars.interestMarketBalance = vars.cTokenBalance;
            }

            // Calculate effects of interacting with cTokenModify
            if (asset == cTokenModify) {
                // redeem effect
                // sumBorrowPlusEffects += tokensToDenom * redeemTokens
                vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(vars.tokensToDenom, redeemTokens, vars.sumBorrowPlusEffects);

                if (vars.marketType == CTokenStorage.MarketType.ERC721_MARKET) {
                    if (borrowAmount != 0) {
                        vars.interestTokenNeeded = true;
                    }
                } else if (address(asset) == interestMarket_) {
                    if (vars.interestMarketBalance >= redeemTokens) {
                        vars.interestMarketBalance = vars.interestMarketBalance - redeemTokens;
                    } else {
                        return (Error.INSUFFICIENT_LIQUIDITY, [uint(0), 0, 0, 0]);
                    }
                }

                // borrow effect
                // sumBorrowPlusEffects += oraclePrice * borrowAmount
                vars.sumBorrowPlusEffects = mul_ScalarTruncateAddUInt(vars.oraclePrice, borrowAmount, vars.sumBorrowPlusEffects);
            }
        }

        uint interestExchangeRateMantissa;
        uint interestOraclePriceMantissa;
        if (vars.sumInterestOwed != 0 || (vars.interestTokenNeeded && vars.interestMarketBalance == 0)) {
            interestExchangeRateMantissa = CToken(interestMarket_).exchangeRateStored();
            interestOraclePriceMantissa = oracle_.getUnderlyingPrice(CToken(interestMarket_));

            // add interest owed to effects
            vars.sumBorrowPlusEffects = vars.sumBorrowPlusEffects +
                vars.sumInterestOwed * interestExchangeRateMantissa * interestOraclePriceMantissa / doubleScale;
        }

        // These are safe, as the underflow condition is checked first
        if (vars.sumCollateral > vars.sumBorrowPlusEffects) {

            // if no collateral shorfall, check for interest reserve shortfall
            if (vars.interestMarketBalance < vars.sumInterestOwed ||
                (vars.interestTokenNeeded && vars.interestMarketBalance == 0)) {
                return (Error.TOO_LITTLE_INTEREST_RESERVE, [
                    0,
                    (vars.sumInterestOwed - vars.interestMarketBalance) * interestExchangeRateMantissa * interestOraclePriceMantissa / doubleScale,
                    vars.sumCollateral,
                    vars.sumBorrowPlusEffects
                ]);
            }

            return (Error.NO_ERROR, [vars.sumCollateral - vars.sumBorrowPlusEffects, 0, vars.sumCollateral, vars.sumBorrowPlusEffects]);
        } else {
            return (Error.NO_ERROR, [0, vars.sumBorrowPlusEffects - vars.sumCollateral, vars.sumCollateral, vars.sumBorrowPlusEffects]);
        }
    }

    /**
     * @notice Calculates the amount of collateral to seize for the given repay amount
     * @param cTokenCollateral Asset to seize collateral from
     * @param normedRepayAmount Repay amount in normalized USD value
     * @return uint Amount of tokens to seize in a liquidation
     */
    function liquidateCalculateSeizeTokensNormed(address cTokenCollateral, uint normedRepayAmount) override public view returns (uint) {
        uint priceCollateralMantissa = oracle.getUnderlyingPrice(CToken(cTokenCollateral));
        if (priceCollateralMantissa == 0) {
            revert PriceError();
        }

        uint exchangeRateMantissa = CToken(cTokenCollateral).exchangeRateStored(); // Note: reverts on error

        uint numerator = liquidationIncentiveMantissa * normedRepayAmount * expScale;
        uint denominator = priceCollateralMantissa * exchangeRateMantissa;

        uint seizeTokens = numerator / denominator;

        return seizeTokens;
    }

    /**
     * @notice Calculates the amount of collateral to seize and the amount of tokens to top up for the given shortfall
     * @param borrower Account with the shortfall
     * @param shortfallUsd Shortfall in normalized USD value
     * @param cTokenInterestMarket Asset to top up
     * @param cTokenCollateral Asset to seize collateral from
     * @return (uint, uint) Amount of tokens to top up, amount of tokens to seize
     */
    function _adjustTopUpValues(address borrower, uint shortfallUsd, address cTokenInterestMarket, address cTokenCollateral) internal view returns (uint, uint) {

        uint exchangeRateInterestMantissa = CToken(cTokenInterestMarket).exchangeRateStored(); // Note: reverts on error
        uint exchangeRateCollateralMantissa = CToken(cTokenCollateral).exchangeRateStored(); // Note: reverts on error

        uint priceInterestMantissa = oracle.getUnderlyingPrice(CToken(cTokenInterestMarket));
        uint priceCollateralMantissa = oracle.getUnderlyingPrice(CToken(cTokenCollateral));
        if (priceInterestMantissa == 0 || priceCollateralMantissa == 0) {
            revert PriceError();
        }

        uint seizeTokens = liquidationIncentiveMantissa * shortfallUsd * expScale;
        seizeTokens = seizeTokens / (priceCollateralMantissa * exchangeRateCollateralMantissa);

        // check and adjust amounts

        uint actualTopUpTokens = shortfallUsd * doubleScale / (priceInterestMantissa * exchangeRateInterestMantissa);
        uint actualSeizeTokens = seizeTokens;

        if (CTokenInterface(cTokenCollateral).marketType() == CTokenStorage.MarketType.ERC721_MARKET) {
            // nft market
            uint oneNFTAmount = doubleScale / exchangeRateCollateralMantissa;
            if (actualSeizeTokens % oneNFTAmount != 0) {
                // ensure whole nft seize size by rounding up to the next whole NFT
                actualSeizeTokens = ((actualSeizeTokens / oneNFTAmount) + 1) * oneNFTAmount;
            }
        }

        uint borrowerBalance = CTokenInterface(cTokenCollateral).balanceOf(borrower);
        if (borrowerBalance < actualSeizeTokens) {
            actualSeizeTokens = borrowerBalance;
        }

        if (actualSeizeTokens != seizeTokens) {
            actualTopUpTokens = actualTopUpTokens * actualSeizeTokens / seizeTokens;
        }

        return (actualTopUpTokens, actualSeizeTokens);
    }


    /*** Admin Functions ***/

    /**
      * @notice Sets a new price oracle for the comptroller
      * @dev Admin function to set a new price oracle
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _setPriceOracle(PriceOracle newOracle) public returns (uint) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PRICE_ORACLE_OWNER_CHECK);
        }

        // Track the old oracle for the comptroller
        PriceOracle oldOracle = oracle;

        // Set comptroller's oracle to newOracle
        oracle = newOracle;

        // Emit NewPriceOracle(oldOracle, newOracle)
        emit NewPriceOracle(oldOracle, newOracle);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Sets the collateralFactor for a market
      * @dev Admin function to set per-market collateralFactor
      * @param cToken The market to set the factor on
      * @param newCollateralFactorMantissa The new collateral factor, scaled by 1e18
      * @return uint 0=success, otherwise a failure. (See ErrorReporter for details)
      */
    function _setCollateralFactor(CToken cToken, uint newCollateralFactorMantissa) external returns (uint) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_COLLATERAL_FACTOR_OWNER_CHECK);
        }

        // Verify market is listed
        Market storage market = markets[address(cToken)];
        if (!market.isListed) {
            return fail(Error.MARKET_NOT_LISTED, FailureInfo.SET_COLLATERAL_FACTOR_NO_EXISTS);
        }

        Exp memory newCollateralFactorExp = Exp({mantissa: newCollateralFactorMantissa});

        // Check collateral factor <= 0.9
        Exp memory highLimit = Exp({mantissa: collateralFactorMaxMantissa});
        if (lessThanExp(highLimit, newCollateralFactorExp)) {
            return fail(Error.INVALID_COLLATERAL_FACTOR, FailureInfo.SET_COLLATERAL_FACTOR_VALIDATION);
        }

        // If collateral factor != 0, fail if price == 0
        if (newCollateralFactorMantissa != 0 && oracle.getUnderlyingPrice(cToken) == 0) {
            return fail(Error.PRICE_ERROR, FailureInfo.SET_COLLATERAL_FACTOR_WITHOUT_PRICE);
        }

        // Set market's collateral factor to new collateral factor, remember old value
        uint oldCollateralFactorMantissa = market.collateralFactorMantissa;
        market.collateralFactorMantissa = newCollateralFactorMantissa;

        // Emit event with asset, old collateral factor, and new collateral factor
        emit NewCollateralFactor(cToken, oldCollateralFactorMantissa, newCollateralFactorMantissa);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Sets liquidationIncentive
      * @dev Admin function to set liquidationIncentive
      * @param newLiquidationIncentiveMantissa New liquidationIncentive scaled by 1e18
      * @return uint 0=success, otherwise a failure. (See ErrorReporter for details)
      */
    function _setLiquidationIncentive(uint newLiquidationIncentiveMantissa) external returns (uint) {
        // Check caller is admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_LIQUIDATION_INCENTIVE_OWNER_CHECK);
        }

        // Save current value for use in log
        uint oldLiquidationIncentiveMantissa = liquidationIncentiveMantissa;

        // Set liquidation incentive to new incentive
        liquidationIncentiveMantissa = newLiquidationIncentiveMantissa;

        // Emit event with old incentive, new incentive
        emit NewLiquidationIncentive(oldLiquidationIncentiveMantissa, newLiquidationIncentiveMantissa);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Add the market to the markets mapping and set it as listed
      * @dev Admin function to set isListed and add support for the market
      * @param cToken The address of the market (token) to list
      * @param amount Amount to initially mint.
      * @return uint 0=success, otherwise a failure. (See enum Error for details)
      */
    function _supportMarket(CToken cToken, uint amount) external returns (uint) {
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SUPPORT_MARKET_OWNER_CHECK);
        }

        if (markets[address(cToken)].isListed) {
            return fail(Error.MARKET_ALREADY_LISTED, FailureInfo.SUPPORT_MARKET_EXISTS);
        }

        cToken.isCToken(); // Sanity check to make sure its really a CToken

        // Note that isComped is not in active use anymore
        Market storage newMarket = markets[address(cToken)];
        assert(newMarket.collateralFactorMantissa == 0);

        newMarket.isListed = true;
        newMarket.isComped = false;
        //newMarket.collateralFactorMantissa = 0;

        _addMarketInternal(address(cToken));

        emit MarketListed(cToken);

        // mint a small amount and burn to ensure non-empty token pools (not needed for ERC721 markets)
        if (amount != 0 && cToken.marketType() != CTokenStorage.MarketType.ERC721_MARKET) {
            cToken._ensureNonEmpty(msg.sender, amount);
        }

        return uint(Error.NO_ERROR);
    }

    function _addMarketInternal(address cToken) internal {
        for (uint i = 0; i < allMarkets.length;) {
            if (allMarkets[i] == CToken(cToken)) {
                revert MarketAlreadyAdded();
            }
            unchecked { i++; }
        }
        allMarkets.push(CToken(cToken));
    }

    /**
      * @notice Set the given borrow caps for the given cToken markets. Borrowing that brings total borrows to or above borrow cap will revert.
      * @dev Admin or borrowCapGuardian function to set the borrow caps. A borrow cap of 0 corresponds to unlimited borrowing.
      * @param cTokens The addresses of the markets (tokens) to change the borrow caps for
      * @param newBorrowCaps The new borrow cap values in underlying to be set. A value of 0 corresponds to unlimited borrowing.
      */
    function _setMarketBorrowCaps(CToken[] calldata cTokens, uint[] calldata newBorrowCaps) external {
        if (msg.sender != admin && msg.sender != borrowCapGuardian) {
            revert Unauthorized();
        }

        uint numMarkets = cTokens.length;
        uint numBorrowCaps = newBorrowCaps.length;

        if (numMarkets == 0 || numMarkets != numBorrowCaps) {
            revert InvalidInput();
        }

        for(uint i = 0; i < numMarkets; i++) {
            borrowCaps[address(cTokens[i])] = newBorrowCaps[i];
            emit NewBorrowCap(cTokens[i], newBorrowCaps[i]);
        }
    }

    /**
     * @notice Admin function to change the Borrow Cap Guardian
     * @param newBorrowCapGuardian The address of the new Borrow Cap Guardian
     */
    function _setBorrowCapGuardian(address newBorrowCapGuardian) external {
        if (msg.sender != admin) {
            revert Unauthorized();
        }

        // Save current value for inclusion in log
        address oldBorrowCapGuardian = borrowCapGuardian;

        // Store borrowCapGuardian with value newBorrowCapGuardian
        borrowCapGuardian = newBorrowCapGuardian;

        // Emit NewBorrowCapGuardian(OldBorrowCapGuardian, NewBorrowCapGuardian)
        emit NewBorrowCapGuardian(oldBorrowCapGuardian, newBorrowCapGuardian);
    }

    /**
     * @notice Admin function to change the Pause Guardian
     * @param newPauseGuardian The address of the new Pause Guardian
     * @return uint 0=success, otherwise a failure. (See enum Error for details)
     */
    function _setPauseGuardian(address newPauseGuardian) public returns (uint) {
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PAUSE_GUARDIAN_OWNER_CHECK);
        }

        // Save current value for inclusion in log
        address oldPauseGuardian = pauseGuardian;

        // Store pauseGuardian with value newPauseGuardian
        pauseGuardian = newPauseGuardian;

        // Emit NewPauseGuardian(OldPauseGuardian, NewPauseGuardian)
        emit NewPauseGuardian(oldPauseGuardian, pauseGuardian);

        return uint(Error.NO_ERROR);
    }

    function _setMintPaused(CToken cToken, bool state) public returns (bool) {
        if (!markets[address(cToken)].isListed) {
            revert MarketNotListed();
        }
        if (msg.sender != admin && msg.sender != pauseGuardian) {
            revert Unauthorized();
        }
        if (msg.sender != admin && !state) {
            revert OnlyAdminCanUnpause();
        }

        mintGuardianPaused[address(cToken)] = state;
        emit ActionPaused(cToken, "Mint", state);
        return state;
    }

    function _setBorrowPaused(CToken cToken, bool state) public returns (bool) {
        if (!markets[address(cToken)].isListed) {
            revert MarketNotListed();
        }
        if (msg.sender != admin && msg.sender != pauseGuardian) {
            revert Unauthorized();
        }
        if (msg.sender != admin && !state) {
            revert OnlyAdminCanUnpause();
        }

        borrowGuardianPaused[address(cToken)] = state;
        emit ActionPaused(cToken, "Borrow", state);
        return state;
    }

    function _setTransferPaused(bool state) public returns (bool) {
        if (msg.sender != admin && msg.sender != pauseGuardian) {
            revert Unauthorized();
        }
        if (msg.sender != admin && !state) {
            revert OnlyAdminCanUnpause();
        }

        transferGuardianPaused = state;
        emit ActionPaused("Transfer", state);
        return state;
    }

    function _setSeizePaused(bool state) public returns (bool) {
        if (msg.sender != admin && msg.sender != pauseGuardian) {
            revert Unauthorized();
        }
        if (msg.sender != admin && !state) {
            revert OnlyAdminCanUnpause();
        }

        seizeGuardianPaused = state;
        emit ActionPaused("Seize", state);
        return state;
    }

    function _setCollectInterestPaused(bool state) public returns (bool) {
        if (msg.sender != admin && msg.sender != pauseGuardian) {
            revert Unauthorized();
        }
        if (msg.sender != admin && !state) {
            revert OnlyAdminCanUnpause();
        }

        collectInterestGuardianPaused = state;
        emit ActionPaused("CollectInterest", state);
        return state;
    }

    function _setPayInterestPaused(bool state) public returns (bool) {
        if (msg.sender != admin && msg.sender != pauseGuardian) {
            revert Unauthorized();
        }
        if (msg.sender != admin && !state) {
            revert OnlyAdminCanUnpause();
        }

        payInterestGuardianPaused = state;
        emit ActionPaused("PayInterest", state);
        return state;
    }

    function _setWhitelist(address user, bool isTrue) public {
        if (msg.sender != admin) {
            revert Unauthorized();
        }
        whitelist[user] = isTrue;
    }

    /**
    * @notice Sets a new interest market
    * @dev Admin function to set a new interest market
    * @param interestMarket_ The address of the new interest market
    */
    function _updateInterestMarket(address interestMarket_) external {
        if (msg.sender != admin) {
            revert Unauthorized();
        }
        if (!markets[interestMarket_].isListed) {
            revert MarketNotListed();
        }
        if (CTokenInterface(interestMarket_).marketType() != CTokenStorage.MarketType.ERC20_INTEREST_MARKET) {
            revert WrongMarketType();
        }
        _interestMarket = interestMarket_;
    }

    function _become(Unitroller unitroller) public {
        if (msg.sender != unitroller.admin()) {
            revert Unauthorized();
        }
        if (unitroller._acceptImplementation() != 0) {
            revert ChangeNotAuthorized();
        }
    }

    /**
     * @notice Checks caller is admin, or this contract is becoming the new implementation
     */
    function adminOrInitializing() internal view returns (bool) {
        return msg.sender == admin || msg.sender == comptrollerImplementation;
    }

    /**
     * @notice Return all of the markets
     * @dev The automatic getter may be used to access an individual market.
     * @return The list of market addresses
     */
    function getAllMarkets() public view returns (CToken[] memory) {
        return allMarkets;
    }

    function getBlockNumber() virtual public view returns (uint) {
        return block.number;
    }

    function isListed(address cToken) override public view returns (bool) {
        return markets[cToken].isListed;
    }

    /**
     * @notice Calculate the exchange rate between the underlyings of the given cTokens
     * @param cTokenA The first cToken
     * @param cTokenB The second cToken
     * @return uint The exchange rate from cTokenA.underlying() to cTokenB.underlying().
     */
    function getAssetsExchangeRate(address cTokenA, address cTokenB) override public view returns (uint) {
        PriceOracle oracle_ = oracle;
        uint priceA = oracle_.getUnderlyingPrice(CToken(cTokenA));
        uint priceB = oracle_.getUnderlyingPrice(CToken(cTokenB));
        return priceA != 0 && priceB != 0 ? priceA * expScale / priceB : 0;
    }

    function _checkEoaOrWL(address msgSender) override public view returns (bool) {
        if (whitelist[msgSender]) { return true; }
        if (tx.origin != msgSender) { return false; }
        uint size;
        assembly { size := extcodesize(msgSender) }
        return size == 0;
    }

    function interestMarket() override external view returns (address) {
        return _interestMarket;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "ComptrollerInterface.sol";
import "CTokenInterfaces.sol";
import "ErrorReporter.sol";
import "EIP20Interface.sol";
import "InterestRateModel.sol";
import "ExponentialNoError.sol";


/**
 * @title Compound's CToken Contract
 * @notice Abstract base for CTokens
 * @author Compound
 */
abstract contract CToken is CTokenInterface, ExponentialNoError, TokenErrorReporter {
    /**
     * @notice Initialize the money market
     * @param comptroller_ The address of the Comptroller
     * @param interestRateModel_ The address of the interest rate model
     * @param initialExchangeRateMantissa_ The initial exchange rate, scaled by 1e18
     * @param name_ EIP-20 name of this token
     * @param symbol_ EIP-20 symbol of this token
     * @param decimals_ EIP-20 decimal precision of this token
     */
    function initialize(ComptrollerInterface comptroller_,
                        InterestRateModel interestRateModel_,
                        uint initialExchangeRateMantissa_,
                        string memory name_,
                        string memory symbol_,
                        uint8 decimals_) virtual public {
        if (msg.sender != admin) {
            revert Unauthorized();
        }
        if (accrualBlockNumber != 0 || borrowIndex != 0) {
            revert AlreadyInitialized();
        }

        // Set initial exchange rate
        initialExchangeRateMantissa = initialExchangeRateMantissa_;
        if (initialExchangeRateMantissa == 0) {
            revert InitializeExchangeRateInvalid();
        }

        // Set the comptroller
        uint err = _setComptroller(comptroller_);
        if (err != NO_ERROR) {
            revert InitializeSetComptrollerFailed(err);
        }

        // Initialize block number and borrow index (block number mocks depend on comptroller being set)
        accrualBlockNumber = getBlockNumber();
        borrowIndex = mantissaOne;

        // Set the interest rate model (depends on block number / borrow index)
        err = _setInterestRateModelFresh(interestRateModel_);
        if (err != NO_ERROR) {
            revert InitializeSetInterestRateModelFailed(err);
        }

        name = name_;
        symbol = symbol_;
        decimals = decimals_;

        // The counter starts true to prevent changing it from zero to non-zero (i.e. smaller cost/refund)
        _notEntered = true;

        if (marketType == CTokenStorage.MarketType.UNDEFINED_MARKET) {
            revert InitializeMarketTypeNotSet();
        }
    }

    /**
     * @notice Transfer `tokens` tokens from `src` to `dst` by `spender`
     * @dev Called by both `transfer` and `transferFrom` internally
     * @param spender The address of the account performing the transfer
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param tokens The number of tokens to transfer
     * @return 0 if the transfer succeeded, else revert
     */
    function transferTokens(address spender, address src, address dst, uint tokens) virtual internal returns (uint) {
        /* Fail if transfer not allowed */
        uint allowed = comptroller.transferAllowed(address(this), src, dst, tokens);
        if (allowed != 0) {
            revert TransferComptrollerRejection(allowed);
        }

        /* Do not allow self-transfers */
        if (src == dst) {
            revert TransferNotAllowed();
        }

        /* Get the allowance, infinite for the account owner */
        uint startingAllowance = 0;
        if (spender == src) {
            startingAllowance = type(uint).max;
        } else {
            startingAllowance = transferAllowances[src][spender];
        }

        /* Do the calculations, checking for {under,over}flow */
        uint allowanceNew = startingAllowance - tokens;
        uint srcTokensNew = accountTokens[src] - tokens;
        uint dstTokensNew = accountTokens[dst] + tokens;

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        accountTokens[src] = srcTokensNew;
        accountTokens[dst] = dstTokensNew;

        /* Eat some of the allowance (if necessary) */
        if (startingAllowance != type(uint).max) {
            transferAllowances[src][spender] = allowanceNew;
        }

        /* We emit a Transfer event */
        emit Transfer(src, dst, tokens);

        return NO_ERROR;
    }

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint256 amount) override external nonReentrant returns (bool) {
        return transferTokens(msg.sender, msg.sender, dst, amount) == NO_ERROR;
    }

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(address src, address dst, uint256 amount) override external nonReentrant returns (bool) {
        return transferTokens(msg.sender, src, dst, amount) == NO_ERROR;
    }

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (uint256.max means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 amount) override external returns (bool) {
        address src = msg.sender;
        transferAllowances[src][spender] = amount;
        emit Approval(src, spender, amount);
        return true;
    }

    /**
     * @notice Get the current allowance from `owner` for `spender`
     * @param owner The address of the account which owns the tokens to be spent
     * @param spender The address of the account which may transfer tokens
     * @return The number of tokens allowed to be spent (-1 means infinite)
     */
    function allowance(address owner, address spender) override external view returns (uint256) {
        return transferAllowances[owner][spender];
    }

    /**
     * @notice Get the token balance of the `owner`
     * @param owner The address of the account to query
     * @return The number of tokens owned by `owner`
     */
    function balanceOf(address owner) override external view returns (uint256) {
        return accountTokens[owner];
    }

    /**
     * @notice Get the underlying balance of the `owner`
     * @dev This also accrues interest in a transaction
     * @param owner The address of the account to query
     * @return The amount of underlying owned by `owner`
     */
    function balanceOfUnderlying(address owner) override external returns (uint) {
        Exp memory exchangeRate = Exp({mantissa: exchangeRateCurrent()});
        return mul_ScalarTruncate(exchangeRate, accountTokens[owner]);
    }

    /**
     * @notice Get a snapshot of the account's balances, and the cached exchange rate
     * @dev This is used by comptroller to more efficiently perform liquidity checks.
     * @param account Address of the account to snapshot
     * @return (possible error, token balance, borrow balance, exchange rate mantissa, borrow interest balance (always 0))
     */
    function getAccountSnapshot(address account) virtual override external view returns (uint, uint, uint, uint, uint) {
        return (
            NO_ERROR,
            accountTokens[account],
            borrowBalanceStoredInternal(account),
            exchangeRateStoredInternal(),
            0
        );
    }

    /**
     * @dev Function to simply retrieve block number
     *  This exists mainly for inheriting test contracts to stub this result.
     */
    function getBlockNumber() virtual internal view returns (uint) {
        return block.number;
    }

    /**
     * @notice Returns the current per-block borrow interest rate for this cToken
     * @return The borrow interest rate per block, scaled by 1e18
     */
    function borrowRatePerBlock() override external view returns (uint) {
        return interestRateModel.getBorrowRate(getCashPrior(), totalBorrows, totalReserves);
    }

    /**
     * @notice Returns the current per-block supply interest rate for this cToken
     * @return The supply interest rate per block, scaled by 1e18
     */
    function supplyRatePerBlock() override external view returns (uint) {
        return interestRateModel.getSupplyRate(getCashPrior(), totalBorrows, totalReserves, reserveFactorMantissa);
    }

    /**
     * @notice Returns the current total borrows plus accrued interest
     * @return The total borrows with interest
     */
    function totalBorrowsCurrent() override external nonReentrant returns (uint) {
        accrueInterest();
        return totalBorrows;
    }

    /**
     * @notice Accrue interest to updated borrowIndex and then calculate account's borrow balance using the updated borrowIndex
     * @param account The address whose balance should be calculated after updating borrowIndex
     * @return The calculated balance
     */
    function borrowBalanceCurrent(address account) override external nonReentrant returns (uint) {
        accrueInterest();
        return borrowBalanceStored(account);
    }

    /**
     * @notice Return the borrow balance of account based on stored data
     * @param account The address whose balance should be calculated
     * @return The calculated balance
     */
    function borrowBalanceStored(address account) override public view returns (uint) {
        return borrowBalanceStoredInternal(account);
    }

    /**
     * @notice Return the borrow balance of account based on stored data
     * @param account The address whose balance should be calculated
     * @return (error code, the calculated balance or 0 if error code is non-zero)
     */
    function borrowBalanceStoredInternal(address account) virtual internal view returns (uint) {
        /* Get borrowBalance and borrowIndex */
        BorrowSnapshot storage borrowSnapshot = accountBorrows[account];

        /* If borrowBalance = 0 then borrowIndex is likely also 0.
         * Rather than failing the calculation with a division by 0, we immediately return 0 in this case.
         */
        if (borrowSnapshot.principal == 0) {
            return 0;
        }

        /* Calculate new borrow balance using the interest index:
         *  recentBorrowBalance = borrower.borrowBalance * market.borrowIndex / borrower.borrowIndex
         */
        uint principalTimesIndex = borrowSnapshot.principal * borrowIndex;
        return principalTimesIndex / borrowSnapshot.interestIndex;
    }

    /**
     * @notice Accrue interest then return the up-to-date exchange rate
     * @return Calculated exchange rate scaled by 1e18
     */
    function exchangeRateCurrent() override public nonReentrant returns (uint) {
        accrueInterest();
        return exchangeRateStored();
    }

    /**
     * @notice Calculates the exchange rate from the underlying to the CToken
     * @dev This function does not accrue interest before calculating the exchange rate
     * @return Calculated exchange rate scaled by 1e18
     */
    function exchangeRateStored() override public view returns (uint) {
        return exchangeRateStoredInternal();
    }

    /**
     * @notice Calculates the exchange rate from the underlying to the CToken
     * @dev This function does not accrue interest before calculating the exchange rate
     * @return calculated exchange rate scaled by 1e18
     */
    function exchangeRateStoredInternal() virtual internal view returns (uint) {
        uint _totalSupply = totalSupply;
        if (_totalSupply == 0) {
            /*
             * If there are no tokens minted:
             *  exchangeRate = initialExchangeRate
             */
            return initialExchangeRateMantissa;
        } else {
            /*
             * Otherwise:
             *  exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply
             */
            uint totalCash = getCashPrior();
            uint cashPlusBorrowsMinusReserves = totalCash + totalBorrows - totalReserves;
            uint exchangeRate = cashPlusBorrowsMinusReserves * expScale / _totalSupply;

            return exchangeRate;
        }
    }

    /**
     * @notice Get cash balance of this cToken in the underlying asset
     * @return The quantity of underlying asset owned by this contract
     */
    function getCash() override external view returns (uint) {
        return getCashPrior();
    }

    /**
     * @notice Applies accrued interest to total borrows and reserves
     * @dev This calculates interest accrued from the last checkpointed block
     *   up to the current block and writes new checkpoint to storage.
     */
    function accrueInterest() virtual override public returns (uint) {
        /* Remember the initial block number */
        uint currentBlockNumber = getBlockNumber();
        uint accrualBlockNumberPrior = accrualBlockNumber;

        /* Short-circuit accumulating 0 interest */
        if (accrualBlockNumberPrior == currentBlockNumber) {
            return NO_ERROR;
        }

        /* Read the previous values out of storage */
        uint cashPrior = getCashPrior();
        uint borrowsPrior = totalBorrows;
        uint reservesPrior = totalReserves;
        uint borrowIndexPrior = borrowIndex;

        /* Calculate the current borrow interest rate */
        uint borrowRateMantissa = interestRateModel.getBorrowRate(cashPrior, borrowsPrior, reservesPrior);
        if (borrowRateMantissa > borrowRateMaxMantissa) {
            revert BorrowRateIsAbsurdlyHigh(borrowRateMantissa);
        }

        /* Calculate the number of blocks elapsed since the last accrual */
        uint blockDelta = currentBlockNumber - accrualBlockNumberPrior;

        /*
         * Calculate the interest accumulated into borrows and reserves and the new index:
         *  simpleInterestFactor = borrowRate * blockDelta
         *  interestAccumulated = simpleInterestFactor * totalBorrows
         *  totalBorrowsNew = interestAccumulated + totalBorrows
         *  totalReservesNew = interestAccumulated * reserveFactor + totalReserves
         *  borrowIndexNew = simpleInterestFactor * borrowIndex + borrowIndex
         */

        Exp memory simpleInterestFactor = mul_(Exp({mantissa: borrowRateMantissa}), blockDelta);
        uint interestAccumulated = mul_ScalarTruncate(simpleInterestFactor, borrowsPrior);
        uint totalBorrowsNew = interestAccumulated + borrowsPrior;
        uint totalReservesNew = mul_ScalarTruncateAddUInt(Exp({mantissa: reserveFactorMantissa}), interestAccumulated, reservesPrior);
        uint borrowIndexNew = mul_ScalarTruncateAddUInt(simpleInterestFactor, borrowIndexPrior, borrowIndexPrior);

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /* We write the previously calculated values into storage */
        accrualBlockNumber = currentBlockNumber;
        borrowIndex = borrowIndexNew;
        totalBorrows = totalBorrowsNew;
        totalReserves = totalReservesNew;

        /* We emit an AccrueInterest event */
        emit AccrueInterest(cashPrior, interestAccumulated, borrowIndexNew, totalBorrowsNew);

        return NO_ERROR;
    }

    /**
     * @notice Sender supplies assets into the market and receives cTokens in exchange
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param mintAmount The amount of the underlying asset to supply
     */
    function mintInternal(uint mintAmount) internal nonReentrantWL {
        accrueInterest();
        // mintFresh emits the actual Mint event if successful and logs on errors, so we don't need to
        mintFresh(msg.sender, mintAmount);
    }

    /**
     * @notice User supplies assets into the market and receives cTokens in exchange
     * @dev Assumes interest has already been accrued up to the current block
     * @param minter The address of the account which is supplying the assets
     * @param mintAmount The amount of the underlying asset to supply
     */
    function mintFresh(address minter, uint mintAmount) internal {
        /* Fail if mint not allowed */
        uint allowed = comptroller.mintAllowed(address(this), minter, mintAmount);
        if (allowed != 0) {
            revert MintComptrollerRejection(allowed);
        }

        /* Verify market's block number equals current block number */
        if (accrualBlockNumber != getBlockNumber()) {
            revert MintFreshnessCheck();
        }

        Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()});

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         *  We call `doTransferIn` for the minter and the mintAmount.
         *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
         *  `doTransferIn` reverts if anything goes wrong, since we can't be sure if
         *  side-effects occurred. The function returns the amount actually transferred,
         *  in case of a fee. On success, the cToken holds an additional `actualMintAmount`
         *  of cash.
         */
        uint actualMintAmount = doTransferIn(minter, mintAmount);

        /*
         * We get the current exchange rate and calculate the number of cTokens to be minted:
         *  mintTokens = actualMintAmount / exchangeRate
         */

        uint mintTokens = div_(actualMintAmount, exchangeRate);

        /*
         * We calculate the new total supply of cTokens and minter token balance, checking for overflow:
         *  totalSupplyNew = totalSupply + mintTokens
         *  accountTokensNew = accountTokens[minter] + mintTokens
         * And write them into storage
         */
        totalSupply = totalSupply + mintTokens;
        accountTokens[minter] = accountTokens[minter] + mintTokens;

        /* We emit a Mint event, and a Transfer event */
        emit Mint(minter, actualMintAmount, mintTokens);
        emit Transfer(address(this), minter, mintTokens);
    }

    /**
     * @notice Sender redeems cTokens in exchange for the underlying asset
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param redeemTokens The number of cTokens to redeem into underlying
     */
    function redeemInternal(uint redeemTokens) internal nonReentrantWL {
        accrueInterest();
        // redeemFresh emits redeem-specific logs on errors, so we don't need to
        redeemFresh(payable(msg.sender), redeemTokens, 0);
    }

    /**
     * @notice Sender redeems cTokens in exchange for a specified amount of underlying asset
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param redeemAmount The amount of underlying to receive from redeeming cTokens
     */
    function redeemUnderlyingInternal(uint redeemAmount) internal nonReentrantWL {
        accrueInterest();
        // redeemFresh emits redeem-specific logs on errors, so we don't need to
        redeemFresh(payable(msg.sender), 0, redeemAmount);
    }

    /**
     * @notice User redeems cTokens in exchange for the underlying asset
     * @dev Assumes interest has already been accrued up to the current block
     * @param redeemer The address of the account which is redeeming the tokens
     * @param redeemTokensIn The number of cTokens to redeem into underlying (only one of redeemTokensIn or redeemAmountIn may be non-zero)
     * @param redeemAmountIn The number of underlying tokens to receive from redeeming cTokens (only one of redeemTokensIn or redeemAmountIn may be non-zero)
     */
    function redeemFresh(address payable redeemer, uint redeemTokensIn, uint redeemAmountIn) internal virtual {
        // Fail if both redeemTokensIn and redeemAmountIn are non-zero
        if (redeemTokensIn != 0 && redeemAmountIn != 0) {
            revert RedeemInvalidInputs();
        }

        /* exchangeRate = invoke Exchange Rate Stored() */
        Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal() });

        uint redeemTokens;
        uint redeemAmount;
        /* If redeemTokensIn > 0: */
        if (redeemTokensIn > 0) {
            /*
             * We calculate the exchange rate and the amount of underlying to be redeemed:
             *  redeemTokens = redeemTokensIn
             *  redeemAmount = redeemTokensIn x exchangeRateCurrent
             */
            redeemTokens = redeemTokensIn;
            redeemAmount = mul_ScalarTruncate(exchangeRate, redeemTokensIn);
        } else {
            /*
             * We get the current exchange rate and calculate the amount to be redeemed:
             *  redeemTokens = redeemAmountIn / exchangeRate
             *  redeemAmount = redeemAmountIn
             */
            redeemTokens = div_(redeemAmountIn, exchangeRate);
            redeemAmount = redeemAmountIn;
        }

        /* Fail if redeem not allowed */
        uint allowed = comptroller.redeemAllowed(address(this), redeemer, redeemTokens);
        if (allowed != 0) {
            revert RedeemComptrollerRejection(allowed);
        }

        /* Verify market's block number equals current block number */
        if (accrualBlockNumber != getBlockNumber()) {
            revert RedeemFreshnessCheck();
        }

        /* Fail gracefully if protocol has insufficient cash */
        if (getCashPrior() < redeemAmount) {
            revert RedeemTransferOutNotPossible();
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)


        /*
         * We write the previously calculated values into storage.
         *  Note: Avoid token reentrancy attacks by writing reduced supply before external transfer.
         */
        totalSupply = totalSupply - redeemTokens;

        uint accountTokensNew = accountTokens[redeemer] - redeemTokens;
        accountTokens[redeemer] = accountTokensNew;

        /*
         * We invoke doTransferOut for the redeemer and the redeemAmount.
         *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the cToken has redeemAmount less of cash.
         *  doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
         */
        doTransferOut(redeemer, redeemAmount);

        /* We emit a Transfer event, and a Redeem event */
        emit Transfer(redeemer, address(this), redeemTokens);
        emit Redeem(redeemer, redeemAmount, redeemTokens);

        // Require tokens is zero or amount is also zero (defense check)
        if (redeemTokens == 0 && redeemAmount > 0) {
            revert("redeemTokens zero");
        }

        if (accountTokensNew == 0 && borrowBalanceStoredInternal(redeemer) == 0) {
            comptroller.autoExitMarkets(redeemer); // silent failure allowed
        }
    }

    /**
      * @notice Sender borrows assets from the protocol to their own address
      * @param borrowAmount The amount of the underlying asset to borrow
      */
    function borrowInternal(uint borrowAmount) internal nonReentrantWL {
        accrueInterest();
        // borrowFresh emits borrow-specific logs on errors, so we don't need to
        borrowFresh(payable(msg.sender), borrowAmount);
    }

    /**
      * @notice Users borrow assets from the protocol to their own address
      * @param borrowAmount The amount of the underlying asset to borrow
      */
    function borrowFresh(address payable borrower, uint borrowAmount) internal virtual {
        /* Fail if borrow not allowed */
        uint allowed = comptroller.borrowAllowed(address(this), borrower, borrowAmount);
        if (allowed != 0) {
            revert BorrowComptrollerRejection(allowed);
        }

        /* Verify market's block number equals current block number */
        if (accrualBlockNumber != getBlockNumber()) {
            revert BorrowFreshnessCheck();
        }

        /* Fail gracefully if protocol has insufficient underlying cash */
        if (getCashPrior() < borrowAmount) {
            revert BorrowCashNotAvailable();
        }

        /*
         * We calculate the new borrower and total borrow balances, failing on overflow:
         *  accountBorrowNew = accountBorrow + borrowAmount
         *  totalBorrowsNew = totalBorrows + borrowAmount
         */
        uint accountBorrowsPrev = borrowBalanceStoredInternal(borrower);
        uint accountBorrowsNew = accountBorrowsPrev + borrowAmount;
        uint totalBorrowsNew = totalBorrows + borrowAmount;

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         * We write the previously calculated values into storage.
         *  Note: Avoid token reentrancy attacks by writing increased borrow before external transfer.
        `*/
        accountBorrows[borrower].principal = accountBorrowsNew;
        accountBorrows[borrower].interestIndex = borrowIndex;
        totalBorrows = totalBorrowsNew;

        /*
         * We invoke doTransferOut for the borrower and the borrowAmount.
         *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the cToken borrowAmount less of cash.
         *  doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
         */
        doTransferOut(borrower, borrowAmount);

        /* We emit a Borrow event */
        emit Borrow(borrower, borrowAmount, accountBorrowsNew, totalBorrowsNew);
    }

    /**
     * @notice Sender repays their own borrow
     * @param repayAmount The amount to repay, or -1 for the full outstanding amount
     */
    function repayBorrowInternal(uint repayAmount) internal nonReentrantWL {
        accrueInterest();
        // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
        repayBorrowFresh(msg.sender, msg.sender, repayAmount);
    }

    /**
     * @notice Sender repays a borrow belonging to borrower
     * @param borrower the account with the debt being payed off
     * @param repayAmount The amount to repay, or -1 for the full outstanding amount
     */
    function repayBorrowBehalfInternal(address borrower, uint repayAmount) internal nonReentrantWL {
        accrueInterest();
        // repayBorrowFresh emits repay-borrow-specific logs on errors, so we don't need to
        repayBorrowFresh(msg.sender, borrower, repayAmount);
    }

    /**
     * @notice Borrows are repaid by another user (possibly the borrower).
     * @param payer the account paying off the borrow
     * @param borrower the account with the debt being payed off
     * @param repayAmount the amount of underlying tokens being returned, or -1 for the full outstanding amount
     * @return (uint) the actual repayment amount.
     */
    function repayBorrowFresh(address payer, address borrower, uint repayAmount) internal virtual returns (uint) {
        /* Fail if repayBorrow not allowed */
        uint allowed = comptroller.repayBorrowAllowed(address(this), payer, borrower, repayAmount);
        if (allowed != 0) {
            revert RepayBorrowComptrollerRejection(allowed);
        }

        /* Verify market's block number equals current block number */
        if (accrualBlockNumber != getBlockNumber()) {
            revert RepayBorrowFreshnessCheck();
        }

        /* We fetch the amount the borrower owes, with accumulated interest */
        uint accountBorrowsPrev = borrowBalanceStoredInternal(borrower);

        /* If repayAmount == -1, repayAmount = accountBorrows */
        uint repayAmountFinal = repayAmount == type(uint).max ? accountBorrowsPrev : repayAmount;

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         * We call doTransferIn for the payer and the repayAmount
         *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the cToken holds an additional repayAmount of cash.
         *  doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
         *   it returns the amount actually transferred, in case of a fee.
         */
        uint actualRepayAmount = doTransferIn(payer, repayAmountFinal);

        /*
         * We calculate the new borrower and total borrow balances, failing on underflow:
         *  accountBorrowsNew = accountBorrows - actualRepayAmount
         *  totalBorrowsNew = totalBorrows - actualRepayAmount
         */
        uint accountBorrowsNew = accountBorrowsPrev - actualRepayAmount;
        uint totalBorrowsNew = totalBorrows > actualRepayAmount ? totalBorrows - actualRepayAmount : 0;

        /* We write the previously calculated values into storage */
        accountBorrows[borrower].principal = accountBorrowsNew;
        accountBorrows[borrower].interestIndex = borrowIndex;
        totalBorrows = totalBorrowsNew;

        /* We emit a RepayBorrow event */
        emit RepayBorrow(payer, borrower, actualRepayAmount, accountBorrowsNew, totalBorrowsNew);

        if (accountBorrowsNew == 0 && accountTokens[borrower] == 0) {
            comptroller.autoExitMarkets(borrower); // silent failure allowed
        }

        return actualRepayAmount;
    }

    /**
     * @notice The sender liquidates the borrowers collateral.
     *  The collateral seized is transferred to the liquidator.
     * @param liquidator The liquidator repaying the borrow and seizing collateral
     * @param borrower The borrower of this cToken to be liquidated
     * @param repayAmount The amount of the underlying borrowed asset to repay
     */
    function _liquidateBorrowInternal(address liquidator, address borrower, uint repayAmount) internal nonReentrant returns (uint) {
        if (msg.sender != address(comptroller)) {
            revert Unauthorized();
        }

        accrueInterest();

        /* Verify market's block number equals current block number */
        if (accrualBlockNumber != getBlockNumber()) {
            revert LiquidateFreshnessCheck();
        }

        /* Fail if borrower = liquidator */
        if (borrower == liquidator) {
            revert LiquidateLiquidatorIsBorrower();
        }

        /* Fail if repayAmount = 0 */
        if (repayAmount == 0) {
            revert LiquidateCloseAmountIsZero();
        }

        /* Fail if repayBorrow fails */
        uint actualRepayAmount = repayBorrowFresh(liquidator, borrower, repayAmount);

        /* We emit a LiquidateBorrow event */
        emit LiquidateBorrow(liquidator, borrower, actualRepayAmount);

        return actualRepayAmount;
    }

    /**
     * @notice Transfers collateral tokens (this market) to the liquidator.
     *         This function can only be called by the Comptroller.
     * @param liquidator The account receiving seized collateral
     * @param borrower The account having collateral seized
     * @param seizeTokens The number of cTokens to seize
     * @return uint actual seizeTokens
     */
    function _seize(address liquidator, address borrower, uint seizeTokens) override virtual external nonReentrant returns (uint) {
        if (msg.sender != address(comptroller)) {
            revert Unauthorized();
        }

        accrueInterest();

        /* Fail if borrower = liquidator */
        if (borrower == liquidator) {
            revert LiquidateSeizeLiquidatorIsBorrower();
        }

        /*
         * We calculate the new borrower and liquidator token balances, failing on underflow/overflow:
         *  borrowerTokensNew = accountTokens[borrower] - seizeTokens
         *  liquidatorTokensNew = accountTokens[liquidator] + seizeTokens
         */
        uint protocolSeizeTokens = mul_(seizeTokens, Exp({mantissa: protocolSeizeShareMantissa}));
        uint liquidatorSeizeTokens = seizeTokens - protocolSeizeTokens;
        Exp memory exchangeRate = Exp({mantissa: exchangeRateStoredInternal()});
        uint protocolSeizeAmount = mul_ScalarTruncate(exchangeRate, protocolSeizeTokens);
        uint totalReservesNew = totalReserves + protocolSeizeAmount;


        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /* We write the calculated values into storage */
        totalReserves = totalReservesNew;
        totalSupply = totalSupply - protocolSeizeTokens;
        accountTokens[borrower] = accountTokens[borrower] - seizeTokens;
        accountTokens[liquidator] = accountTokens[liquidator] + liquidatorSeizeTokens;

        /* Emit a Transfer event */
        emit Transfer(borrower, liquidator, liquidatorSeizeTokens);
        emit Transfer(borrower, address(this), protocolSeizeTokens);
        emit ReservesAdded(address(this), protocolSeizeAmount, totalReservesNew);

        return seizeTokens;
    }

    /*** Admin Functions ***/

    /**
      * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
      * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
      * @param newPendingAdmin New pending admin.
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _setPendingAdmin(address payable newPendingAdmin) override external returns (uint) {
        // Check caller = admin
        if (msg.sender != admin) {
            revert SetPendingAdminOwnerCheck();
        }

        // Save current value, if any, for inclusion in log
        address oldPendingAdmin = pendingAdmin;

        // Store pendingAdmin with value newPendingAdmin
        pendingAdmin = newPendingAdmin;

        // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
        emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);

        return NO_ERROR;
    }

    /**
      * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
      * @dev Admin function for pending admin to accept role and update admin
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _acceptAdmin() override external returns (uint) {
        // Check caller is pendingAdmin and pendingAdmin ≠ address(0)
        if (msg.sender != pendingAdmin || msg.sender == address(0)) {
            revert AcceptAdminPendingAdminCheck();
        }

        // Save current values for inclusion in log
        address oldAdmin = admin;
        address oldPendingAdmin = pendingAdmin;

        // Store admin with value pendingAdmin
        admin = pendingAdmin;

        // Clear the pending value
        pendingAdmin = payable(address(0));

        emit NewAdmin(oldAdmin, admin);
        emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);

        return NO_ERROR;
    }

    /**
      * @notice Sets a new comptroller for the market
      * @dev Admin function to set a new comptroller
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _setComptroller(ComptrollerInterface newComptroller) override public returns (uint) {
        // Check caller is admin
        if (msg.sender != admin) {
            revert SetComptrollerOwnerCheck();
        }

        ComptrollerInterface oldComptroller = comptroller;
        // Ensure invoke comptroller.isComptroller() returns true
        if (!newComptroller.isComptroller()) {
            revert InvalidComptrollerAddress(address(newComptroller));
        }

        // Set market's comptroller to newComptroller
        comptroller = newComptroller;

        // Emit NewComptroller(oldComptroller, newComptroller)
        emit NewComptroller(oldComptroller, newComptroller);

        return NO_ERROR;
    }

    /**
      * @notice Sets protocolSeizeShareMantissa
      * @dev Admin function to set protocolSeizeShareMantissa
      * @param newProtocolSeizeShareMantissa New protocolSeizeShareMantissa scaled by 1e18
      * @return uint 0=success, otherwise a failure. (See ErrorReporter for details)
      */
    function _setProtocolSeizeShare(uint newProtocolSeizeShareMantissa) virtual override external returns (uint) {
        // Check caller is admin
        if (msg.sender != admin) {
            revert SetProtocolSeizeShareAdminCheck();
        }

        if (newProtocolSeizeShareMantissa > protocolSeizeShareMaxMantissa) {
            revert SetProtocolSeizeShareTooHigh();
        }

        // Save current value for use in log
        uint oldProtocolSeizeShareMantissa = protocolSeizeShareMantissa;

        // Set liquidation incentive to new incentive
        protocolSeizeShareMantissa = newProtocolSeizeShareMantissa;

        // Emit event with old incentive, new incentive
        emit NewProtocolSeizeShare(oldProtocolSeizeShareMantissa, newProtocolSeizeShareMantissa);

        return NO_ERROR;
    }

    /**
      * @notice accrues interest and sets a new reserve factor for the protocol using _setReserveFactorFresh
      * @dev Admin function to accrue interest and set a new reserve factor
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _setReserveFactor(uint newReserveFactorMantissa) override external nonReentrant returns (uint) {
        accrueInterest();
        // _setReserveFactorFresh emits reserve-factor-specific logs on errors, so we don't need to.
        return _setReserveFactorFresh(newReserveFactorMantissa);
    }

    /**
      * @notice Sets a new reserve factor for the protocol (*requires fresh interest accrual)
      * @dev Admin function to set a new reserve factor
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _setReserveFactorFresh(uint newReserveFactorMantissa) internal returns (uint) {
        // Check caller is admin
        if (msg.sender != admin) {
            revert SetReserveFactorAdminCheck();
        }

        // Verify market's block number equals current block number
        if (accrualBlockNumber != getBlockNumber()) {
            revert SetReserveFactorFreshCheck();
        }

        // Check newReserveFactor ≤ maxReserveFactor
        if (newReserveFactorMantissa > reserveFactorMaxMantissa) {
            revert SetReserveFactorBoundsCheck();
        }

        uint oldReserveFactorMantissa = reserveFactorMantissa;
        reserveFactorMantissa = newReserveFactorMantissa;

        emit NewReserveFactor(oldReserveFactorMantissa, newReserveFactorMantissa);

        return NO_ERROR;
    }

    /**
     * @notice Accrues interest and reduces reserves by transferring from msg.sender
     * @param addAmount Amount of addition to reserves
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _addReservesInternal(uint addAmount) internal nonReentrantWL returns (uint) {
        accrueInterest();

        // _addReservesFresh emits reserve-addition-specific logs on errors, so we don't need to.
        _addReservesFresh(addAmount);
        return NO_ERROR;
    }

    /**
     * @notice Add reserves by transferring from caller
     * @dev Requires fresh interest accrual
     * @param addAmount Amount of addition to reserves
     * @return (uint, uint) An error code (0=success, otherwise a failure (see ErrorReporter.sol for details)) and the actual amount added, net token fees
     */
    function _addReservesFresh(uint addAmount) internal virtual returns (uint, uint) {
        // totalReserves + actualAddAmount
        uint totalReservesNew;
        uint actualAddAmount = 0;

        // We fail gracefully unless market's block number equals current block number
        if (accrualBlockNumber != getBlockNumber()) {
            revert AddReservesFactorFreshCheck(actualAddAmount);
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        /*
         * We call doTransferIn for the caller and the addAmount
         *  Note: The cToken must handle variations between ERC-20 and ETH underlying.
         *  On success, the cToken holds an additional addAmount of cash.
         *  doTransferIn reverts if anything goes wrong, since we can't be sure if side effects occurred.
         *  it returns the amount actually transferred, in case of a fee.
         */

        actualAddAmount = doTransferIn(msg.sender, addAmount);

        totalReservesNew = totalReserves + actualAddAmount;

        // Store reserves[n+1] = reserves[n] + actualAddAmount
        totalReserves = totalReservesNew;

        /* Emit NewReserves(admin, actualAddAmount, reserves[n+1]) */
        emit ReservesAdded(msg.sender, actualAddAmount, totalReservesNew);

        /* Return (NO_ERROR, actualAddAmount) */
        return (NO_ERROR, actualAddAmount);
    }


    /**
     * @notice Accrues interest and reduces reserves by transferring to admin
     * @param reduceAmount Amount of reduction to reserves
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _reduceReserves(uint reduceAmount) override external nonReentrant returns (uint) {
        accrueInterest();
        // _reduceReservesFresh emits reserve-reduction-specific logs on errors, so we don't need to.
        return _reduceReservesFresh(reduceAmount);
    }

    /**
     * @notice Reduces reserves by transferring to admin
     * @dev Requires fresh interest accrual
     * @param reduceAmount Amount of reduction to reserves
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _reduceReservesFresh(uint reduceAmount) internal virtual returns (uint) {
        // totalReserves - reduceAmount
        uint totalReservesNew;

        // Check caller is admin
        if (msg.sender != admin) {
            revert ReduceReservesAdminCheck();
        }

        // We fail gracefully unless market's block number equals current block number
        if (accrualBlockNumber != getBlockNumber()) {
            revert ReduceReservesFreshCheck();
        }

        // Fail gracefully if protocol has insufficient underlying cash
        if (getCashPrior() < reduceAmount) {
            revert ReduceReservesCashNotAvailable();
        }

        // Check reduceAmount ≤ reserves[n] (totalReserves)
        if (reduceAmount > totalReserves) {
            revert ReduceReservesCashValidation();
        }

        /////////////////////////
        // EFFECTS & INTERACTIONS
        // (No safe failures beyond this point)

        totalReservesNew = totalReserves - reduceAmount;

        // Store reserves[n+1] = reserves[n] - reduceAmount
        totalReserves = totalReservesNew;

        // doTransferOut reverts if anything goes wrong, since we can't be sure if side effects occurred.
        doTransferOut(admin, reduceAmount);

        emit ReservesReduced(admin, reduceAmount, totalReservesNew);

        return NO_ERROR;
    }

    /**
     * @notice accrues interest and updates the interest rate model using _setInterestRateModelFresh
     * @dev Admin function to accrue interest and update the interest rate model
     * @param newInterestRateModel the new interest rate model to use
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setInterestRateModel(InterestRateModel newInterestRateModel) override public returns (uint) {
        accrueInterest();
        // _setInterestRateModelFresh emits interest-rate-model-update-specific logs on errors, so we don't need to.
        return _setInterestRateModelFresh(newInterestRateModel);
    }

    /**
     * @notice updates the interest rate model (*requires fresh interest accrual)
     * @dev Admin function to update the interest rate model
     * @param newInterestRateModel the new interest rate model to use
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setInterestRateModelFresh(InterestRateModel newInterestRateModel) internal returns (uint) {

        // Used to store old model for use in the event that is emitted on success
        InterestRateModel oldInterestRateModel;

        // Check caller is admin
        if (msg.sender != admin) {
            revert SetInterestRateModelOwnerCheck();
        }

        // We fail gracefully unless market's block number equals current block number
        if (accrualBlockNumber != getBlockNumber()) {
            revert SetInterestRateModelFreshCheck();
        }

        // Track the market's current interest rate model
        oldInterestRateModel = interestRateModel;

        // Ensure invoke newInterestRateModel.isInterestRateModel() returns true
        if (!newInterestRateModel.isInterestRateModel()) {
            revert InvalidRateModelAddress(address(newInterestRateModel));
        }

        // Set the interest rate model to newInterestRateModel
        interestRateModel = newInterestRateModel;

        // Emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel)
        emit NewMarketInterestRateModel(oldInterestRateModel, newInterestRateModel);

        return NO_ERROR;
    }

    function _ensureNonEmpty(address minter, uint amount) virtual external;

    // called only once by the comptroller during _supportMarket
    function _ensureNonEmptyInternal(address minter, uint amount) internal nonReentrant {
        if (msg.sender != address(comptroller)) {
            revert Unauthorized();
        }

        if (amount == 0) {
            revert EnsureNonEmptyAmountTooSmall();
        }

        // this function is called during market setup, so an existing totalSupply should not be possible
        assert(totalSupply == 0);

        accrueInterest();
        mintFresh(minter, amount);

        uint totalSupply_ = totalSupply;
        if (totalSupply_ == 0) {
            revert EnsureNonEmptyAmountTooSmall();
        }
        assert(totalSupply_ == accountTokens[minter]);

        // burn minted balance
        accountTokens[minter] = 0;
        accountTokens[address(0)] = totalSupply_;
        emit Transfer(minter, address(0), totalSupply_);
    }

    /*** Safe Token ***/

    /**
     * @notice Gets balance of this contract in terms of the underlying
     * @dev This excludes the value of the current message, if any
     * @return The quantity of underlying owned by this contract
     */
    function getCashPrior() virtual internal view returns (uint);

    /**
     * @dev Performs a transfer in, reverting upon failure. Returns the amount actually transferred to the protocol, in case of a fee.
     *  This may revert due to insufficient balance or insufficient allowance.
     */
    function doTransferIn(address from, uint amount) virtual internal returns (uint);

    /**
     * @dev Performs a transfer out, ideally returning an explanatory error code upon failure rather than reverting.
     *  If caller has not called checked protocol's balance, may revert due to insufficient cash held in the contract.
     *  If caller has checked protocol's balance, and verified it is >= amount, this should not revert in normal conditions.
     */
    function doTransferOut(address payable to, uint amount) virtual internal;


    /*** Reentrancy Guard ***/

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     */
    modifier nonReentrant() {
        if (!_notEntered) {
            revert Reentry();
        }
        _notEntered = false;
        _;
        _notEntered = true; // get a gas-refund post-Istanbul
    }

    modifier nonReentrantWL() {
        if (!comptroller._checkEoaOrWL(msg.sender)) {
            revert Unauthorized();
        }
        if (!_notEntered) {
            revert Reentry();
        }
        _notEntered = false;
        _;
        _notEntered = true; // get a gas-refund post-Istanbul
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

abstract contract ComptrollerInterface {
    /// @notice Indicator that this is a Comptroller contract (for inspection)
    bool public constant isComptroller = true;

    /*** Assets You Are In ***/

    function autoEnterMarkets(address account) virtual external;
    function autoExitMarkets(address account) virtual external;
    function enterMarkets(address[] calldata cTokens) virtual external returns (uint[] memory);
    function exitMarket(address cToken) virtual external returns (uint);
    function redeemAllInterest(address lender, address[] memory cTokens) virtual external returns (uint[] memory);

    /*** Policy Hooks ***/

    function mintAllowed(address cToken, address minter, uint mintAmount) virtual external returns (uint);

    function redeemAllowed(address cToken, address redeemer, uint redeemTokens) virtual external returns (uint);

    function borrowAllowed(address cToken, address borrower, uint borrowAmount) virtual external returns (uint);

    function repayBorrowAllowed(
        address cToken,
        address payer,
        address borrower,
        uint repayAmount) virtual external returns (uint);

    function collectInterestAllowed(
        address cTokenInterestMarket,
        address cTokenSupplyMarket,
        address lender,
        uint interestAmount) virtual external returns (uint);

    function payInterestAllowed(
        address cTokenInterestMarket,
        address cTokenBorrowMarket,
        address payer,
        uint payTokens) virtual external returns (uint);

    function transferAllowed(address cToken, address src, address dst, uint transferTokens) virtual external returns (uint);

    function isListed(address cToken) virtual external view returns (bool);

    function getAssetsExchangeRate(address cTokenA, address cTokenB) virtual external view returns (uint);

    function _checkEoaOrWL(address msgSender) virtual external view returns (bool);

    /*** Liquidity/Liquidation Calculations ***/

    struct Liquidatables {
        address cToken; // token to liquidate
        uint amount;    // non-NFT markets
        uint[] nftIds;  // NFT markets
    }

    function topUpInterestShortfall(address borrower, uint maxTopUpTokens, address cTokenCollateral) virtual external returns (uint[2] memory);

    function batchLiquidateBorrow(address borrower, Liquidatables[] memory liquidatables, address[] memory cTokenCollaterals, uint minSeizedValue) virtual external returns (uint[][2] memory results);

    function liquidateCalculateSeizeTokensNormed(address cTokenCollateral, uint normedRepayAmount) virtual public view returns (uint);

    function interestMarket() virtual external view returns (address);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "ComptrollerInterface.sol";
import "InterestRateModel.sol";
import "EIP20NonStandardInterface.sol";
import "ErrorReporter.sol";

contract CTokenStorage {
    /**
     * @dev Guard variable for re-entrancy checks
     */
    bool internal _notEntered;

    /**
     * @notice EIP-20 token name for this token
     */
    string public name;

    /**
     * @notice EIP-20 token symbol for this token
     */
    string public symbol;

    /**
     * @notice EIP-20 token decimals for this token
     */
    uint8 public decimals;

    // Maximum borrow rate that can ever be applied (.0005% / block)
    uint internal constant borrowRateMaxMantissa = 0.0005e16;

    // Maximum fraction of interest that can be set aside for reserves
    uint internal constant reserveFactorMaxMantissa = 1e18;

    // Maximum protocol seize share that can be set
    uint internal constant protocolSeizeShareMaxMantissa = 20e16;

    /**
     * @notice Administrator for this contract
     */
    address payable public admin;

    /**
     * @notice Pending administrator for this contract
     */
    address payable public pendingAdmin;

    /**
     * @notice Contract which oversees inter-cToken operations
     */
    ComptrollerInterface public comptroller;

    /**
     * @notice Model which tells what the current interest rate should be
     */
    InterestRateModel public interestRateModel;

    // Initial exchange rate used when minting the first CTokens (used when totalSupply = 0)
    uint internal initialExchangeRateMantissa;

    /**
     * @notice Fraction of interest currently set aside for reserves
     */
    uint public reserveFactorMantissa;

    /**
     * @notice Block number that interest was last accrued at
     */
    uint public accrualBlockNumber;

    /**
     * @notice Accumulator of the total earned interest rate since the opening of the market
     */
    uint public borrowIndex;

    /**
     * @notice Total amount of outstanding borrows of the underlying in this market
     */
    uint public totalBorrows;

    /**
     * @notice Total amount of reserves of the underlying held in this market
     */
    uint public totalReserves;

    /**
     * @notice Total number of tokens in circulation
     */
    uint public totalSupply;

    // Official record of token balances for each account
    mapping (address => uint) internal accountTokens;

    // Approved token transfer amounts on behalf of others
    mapping (address => mapping (address => uint)) internal transferAllowances;

    /**
     * @notice Container for borrow balance information
     * @member principal Total balance (with accrued interest), after applying the most recent balance-changing action
     * @member interestIndex Global borrowIndex as of the most recent balance-changing action
     * @member interestAccrued Total interest accrued for markets that track it separately from borrow balance
     */
    struct BorrowSnapshot {
        uint principal;
        uint interestIndex;
        uint interestAccrued;
    }

    // Mapping of account addresses to outstanding borrow balances
    mapping(address => BorrowSnapshot) internal accountBorrows;

    /**
     * @notice Share of seized collateral that is added to reserves
     */
    uint public protocolSeizeShareMantissa = 2.8e16; //2.8%

    /**
     * @notice MarketType enum
     */
    enum MarketType {
        UNDEFINED_MARKET,
        ERC20_MARKET,
        ERC721_MARKET,
        ERC20_INTEREST_MARKET
    }

    /**
     * @notice Indicates a token market type
     */
    MarketType public marketType;
}

abstract contract CTokenInterface is CTokenStorage {
    /**
     * @notice Indicator that this is a CToken contract (for inspection)
     */
    bool public constant isCToken = true;


    /*** Market Events ***/

    /**
     * @notice Event emitted when interest is accrued
     */
    event AccrueInterest(uint cashPrior, uint interestAccumulated, uint borrowIndex, uint totalBorrows);

    /**
     * @notice Event emitted when tokens are minted
     */
    event Mint(address minter, uint mintAmount, uint mintTokens);

    /**
     * @notice Event emitted when tokens are redeemed
     */
    event Redeem(address redeemer, uint redeemAmount, uint redeemTokens);

    /**
     * @notice Event emitted when underlying is borrowed
     */
    event Borrow(address borrower, uint borrowAmount, uint accountBorrows, uint totalBorrows);

    /**
     * @notice Event emitted when a borrow is repaid
     */
    event RepayBorrow(address payer, address borrower, uint repayAmount, uint accountBorrows, uint totalBorrows);

    /**
     * @notice Event emitted when a borrow is liquidated
     */
    event LiquidateBorrow(address liquidator, address borrower, uint repayAmount);


    /*** Admin Events ***/

    /**
     * @notice Event emitted when pendingAdmin is changed
     */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
     * @notice Event emitted when pendingAdmin is accepted, which means admin is updated
     */
    event NewAdmin(address oldAdmin, address newAdmin);

    /**
     * @notice Event emitted when comptroller is changed
     */
    event NewComptroller(ComptrollerInterface oldComptroller, ComptrollerInterface newComptroller);

    /**
     * @notice Event emitted when interestRateModel is changed
     */
    event NewMarketInterestRateModel(InterestRateModel oldInterestRateModel, InterestRateModel newInterestRateModel);

    /**
     * @notice Event emitted when the seize share is changed
     */
    event NewProtocolSeizeShare(uint oldProtocolSeizeShareMantissa, uint newProtocolSeizeShareMantissa);

    /**
     * @notice Event emitted when the reserve factor is changed
     */
    event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa);

    /**
     * @notice Event emitted when the reserves are added
     */
    event ReservesAdded(address benefactor, uint addAmount, uint newTotalReserves);

    /**
     * @notice Event emitted when the reserves are reduced
     */
    event ReservesReduced(address admin, uint reduceAmount, uint newTotalReserves);

    /**
     * @notice EIP20 Transfer event
     */
    event Transfer(address indexed from, address indexed to, uint amount);

    /**
     * @notice EIP20 Approval event
     */
    event Approval(address indexed owner, address indexed spender, uint amount);


    /*** User Interface ***/

    function transfer(address dst, uint amount) virtual external returns (bool);
    function transferFrom(address src, address dst, uint amount) virtual external returns (bool);
    function approve(address spender, uint amount) virtual external returns (bool);
    function allowance(address owner, address spender) virtual external view returns (uint);
    function balanceOf(address owner) virtual external view returns (uint);
    function balanceOfUnderlying(address owner) virtual external returns (uint);
    function getAccountSnapshot(address account) virtual external view returns (uint, uint, uint, uint, uint);
    function borrowRatePerBlock() virtual external view returns (uint);
    function supplyRatePerBlock() virtual external view returns (uint);
    function totalBorrowsCurrent() virtual external returns (uint);
    function borrowBalanceCurrent(address account) virtual external returns (uint);
    function borrowBalanceStored(address account) virtual external view returns (uint);
    function exchangeRateCurrent() virtual external returns (uint);
    function exchangeRateStored() virtual external view returns (uint);
    function getCash() virtual external view returns (uint);
    function accrueInterest() virtual external returns (uint);
    function _seize(address liquidator, address borrower, uint seizeTokens) virtual external returns (uint);
    function sweepToken(EIP20NonStandardInterface token) virtual external;


    /*** Admin Functions ***/

    function _setPendingAdmin(address payable newPendingAdmin) virtual external returns (uint);
    function _acceptAdmin() virtual external returns (uint);
    function _setComptroller(ComptrollerInterface newComptroller) virtual external returns (uint);
    function _setProtocolSeizeShare(uint newProtocolSeizeShareMantissa) virtual external returns (uint);
    function _setReserveFactor(uint newReserveFactorMantissa) virtual external returns (uint);
    function _reduceReserves(uint reduceAmount) virtual external returns (uint);
    function _setInterestRateModel(InterestRateModel newInterestRateModel) virtual external returns (uint);
}

contract CErc20Storage {
    /**
     * @notice Underlying asset for this CToken
     */
    address public underlying;
}

abstract contract CErc20Interface is CErc20Storage {

    /*** User Interface ***/

    function mint(uint mintAmount) virtual external returns (uint);
    function redeem(uint redeemTokens) virtual external returns (uint);
    function redeemUnderlying(uint redeemAmount) virtual external returns (uint);
    function borrow(uint borrowAmount) virtual external returns (uint);
    function repayBorrow(uint repayAmount) virtual external returns (uint);
    function repayBorrowBehalf(address borrower, uint repayAmount) virtual external returns (uint);
    function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) virtual external returns (uint);

    /*** Admin Functions ***/

    function _addReserves(uint addAmount) virtual external returns (uint);
}

interface IWeth {
    function transferFrom(address src, address dst, uint wad) external;
    function withdraw(uint256 wad) external;
}

abstract contract CEtherInterface is CErc20Storage {

    /*** User Interface ***/

    function mint() virtual external payable;
    function redeem(uint redeemTokens) virtual external returns (uint);
    function redeemUnderlying(uint redeemAmount) virtual external returns (uint);
    function borrow(uint borrowAmount) virtual external returns (uint);
    function repayBorrow() virtual external payable;
    function repayBorrowBehalf(address borrower) virtual external payable;
    function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) virtual external returns (uint);

    /*** Admin Functions ***/

    function _addReserves() virtual external payable returns (uint);
}

contract CDelegationStorage {
    /**
     * @notice Implementation address for this contract
     */
    address public implementation;
}

abstract contract CDelegatorInterface is CDelegationStorage {
    /**
     * @notice Emitted when implementation is changed
     */
    event NewImplementation(address oldImplementation, address newImplementation);

    error CannotReceiveValueGtZero();

    /**
     * @notice Called by the admin to update the implementation of the delegator
     * @param implementation_ The address of the new implementation for delegation
     * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation
     * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation
     */
    function _setImplementation(address implementation_, bool allowResign, bytes memory becomeImplementationData) virtual external;
}

abstract contract CDelegateInterface is CDelegationStorage {
    /**
     * @notice Called by the delegator on a delegate to initialize it for duty
     * @dev Should revert if any issues arise which make it unfit for delegation
     * @param data The encoded bytes data for any initialization
     */
    function _becomeImplementation(bytes memory data) virtual external;

    /**
     * @notice Called by the delegator on a delegate to forfeit its responsibility
     */
    function _resignImplementation() virtual external;
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

/**
  * @title Compound's InterestRateModel Interface
  * @author Compound
  */
abstract contract InterestRateModel {
    /// @notice Indicator that this is an InterestRateModel contract (for inspection)
    bool public constant isInterestRateModel = true;

    /**
      * @notice Calculates the current borrow interest rate per block
      * @param cash The total amount of cash the market has
      * @param borrows The total amount of borrows the market has outstanding
      * @param reserves The total amount of reserves the market has
      * @return The borrow rate per block (as a percentage, and scaled by 1e18)
      */
    function getBorrowRate(uint cash, uint borrows, uint reserves) virtual public view returns (uint);

    /**
      * @notice Calculates the current supply interest rate per block
      * @param cash The total amount of cash the market has
      * @param borrows The total amount of borrows the market has outstanding
      * @param reserves The total amount of reserves the market has
      * @param reserveFactorMantissa The current reserve factor the market has
      * @return The supply rate per block (as a percentage, and scaled by 1e18)
      */
    function getSupplyRate(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) virtual public view returns (uint);

    /**
     * @notice Calculates the current borrow and supply rate per block
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market
     * @param reserveFactorMantissa The current reserve factor for the market
     * @return (uint, uint) The borrow rate percentage per block as a mantissa (scaled by BASE),
     *         supply rate percentage per block as a mantissa (scaled by BASE)
     */
    function getMarketRates(uint cash, uint borrows, uint reserves, uint reserveFactorMantissa) virtual public view returns (uint, uint) {
      return (getBorrowRate(cash, borrows, reserves), getSupplyRate(cash, borrows, reserves, reserveFactorMantissa));
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

/**
 * @title EIP20NonStandardInterface
 * @dev Version of ERC20 with no return values for `transfer` and `transferFrom`
 *  See https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
 */
interface EIP20NonStandardInterface {

    /**
     * @notice Get the total number of tokens in circulation
     * @return The supply of tokens
     */
    function totalSupply() external view returns (uint256);

    /**
     * @notice Gets the balance of the specified address
     * @param owner The address from which the balance will be retrieved
     * @return balance The balance
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    ///
    /// !!!!!!!!!!!!!!
    /// !!! NOTICE !!! `transfer` does not return a value, in violation of the ERC-20 specification
    /// !!!!!!!!!!!!!!
    ///

    /**
      * @notice Transfer `amount` tokens from `msg.sender` to `dst`
      * @param dst The address of the destination account
      * @param amount The number of tokens to transfer
      */
    function transfer(address dst, uint256 amount) external;

    ///
    /// !!!!!!!!!!!!!!
    /// !!! NOTICE !!! `transferFrom` does not return a value, in violation of the ERC-20 specification
    /// !!!!!!!!!!!!!!
    ///

    /**
      * @notice Transfer `amount` tokens from `src` to `dst`
      * @param src The address of the source account
      * @param dst The address of the destination account
      * @param amount The number of tokens to transfer
      */
    function transferFrom(address src, address dst, uint256 amount) external;

    /**
      * @notice Approve `spender` to transfer up to `amount` from `src`
      * @dev This will overwrite the approval amount for `spender`
      *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
      * @param spender The address of the account which may transfer tokens
      * @param amount The number of tokens that are approved
      * @return success Whether or not the approval succeeded
      */
    function approve(address spender, uint256 amount) external returns (bool success);

    /**
      * @notice Get the current allowance from `owner` for `spender`
      * @param owner The address of the account which owns the tokens to be spent
      * @param spender The address of the account which may transfer tokens
      * @return remaining The number of tokens allowed to be spent
      */
    function allowance(address owner, address spender) external view returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

contract ComptrollerErrorReporter {
    enum Error {
        NO_ERROR,
        UNAUTHORIZED,
        COMPTROLLER_MISMATCH,
        INSUFFICIENT_SHORTFALL,
        INSUFFICIENT_LIQUIDITY,
        INVALID_CLOSE_FACTOR,
        INVALID_COLLATERAL_FACTOR,
        INVALID_LIQUIDATION_INCENTIVE,
        MARKET_NOT_ENTERED, // no longer possible
        MARKET_NOT_LISTED,
        MARKET_ALREADY_LISTED,
        MATH_ERROR,
        NONZERO_BORROW_BALANCE,
        PRICE_ERROR,
        REJECTION,
        SNAPSHOT_ERROR,
        TOO_MANY_ASSETS,
        TOO_MUCH_REPAY,
        INVALID_MARKET_TYPE,
        TOO_LITTLE_INTEREST_RESERVE,
        NONZERO_INTEREST_BALANCE,
        LIQUIDATE_SEIZE_TOO_LITTLE
    }

    enum FailureInfo {
        ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
        ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK,
        EXIT_MARKET_BALANCE_OWED,
        EXIT_MARKET_REJECTION,
        SET_CLOSE_FACTOR_OWNER_CHECK,
        SET_CLOSE_FACTOR_VALIDATION,
        SET_COLLATERAL_FACTOR_OWNER_CHECK,
        SET_COLLATERAL_FACTOR_NO_EXISTS,
        SET_COLLATERAL_FACTOR_VALIDATION,
        SET_COLLATERAL_FACTOR_WITHOUT_PRICE,
        SET_IMPLEMENTATION_OWNER_CHECK,
        SET_LIQUIDATION_INCENTIVE_OWNER_CHECK,
        SET_LIQUIDATION_INCENTIVE_VALIDATION,
        SET_MAX_ASSETS_OWNER_CHECK,
        SET_PENDING_ADMIN_OWNER_CHECK,
        SET_PENDING_IMPLEMENTATION_OWNER_CHECK,
        SET_PRICE_ORACLE_OWNER_CHECK,
        SUPPORT_MARKET_EXISTS,
        SUPPORT_MARKET_OWNER_CHECK,
        SET_PAUSE_GUARDIAN_OWNER_CHECK
    }

    /**
      * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary
      * contract-specific code that enables us to report opaque error codes from upgradeable contracts.
      **/
    event Failure(uint error, uint info, uint detail);

    error Unauthorized();
    error InitializationFailed();

    error GetAccountSnapshotFailed(uint256 errorCode);

    error SeizePaused();
    error MintPaused();
    error BorrowPaused();
    error CollectInterestPaused();
    error PayInterestPaused();
    error TransferPaused();

    error InsufficientShortfall(uint errorCode, uint value);
    error InvalidTopUpLimit();
    error TopUpLimitExceeded();
    error TopUpZero();
    error SeizeFailed();
    error TopUpFailed();
    error LiquidateError();
    error LiquidateSeizeTooLittle();
    error LiquidateSeizeTooMuch();
    error LiquidateSeizeBellowMinValue(uint minSeizedValue, uint liquidatedValueTotal);
    error ExcessRefundFailed();
    error BorrowCapReached();
    error MarketAlreadyAdded();
    error InvalidInput();
    error OnlyAdminCanUnpause();
    error ChangeNotAuthorized();

    error MarketNotListed();
    error SameMarket();
    error WrongMarketType();
    error PriceError();
    error ComptrollerMismatch();
    error InvalidMarket();
    

    /**
      * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator
      */
    function fail(Error err, FailureInfo info) internal returns (uint) {
        emit Failure(uint(err), uint(info), 0);

        return uint(err);
    }

    /**
      * @dev use this when reporting an opaque error from an upgradeable collaborator contract
      */
    function failOpaque(Error err, FailureInfo info, uint opaqueError) internal returns (uint) {
        emit Failure(uint(err), uint(info), opaqueError);

        return uint(err);
    }
}

contract TokenErrorReporter {
    uint public constant NO_ERROR = 0; // support legacy return codes

    error Unauthorized();
    error Unsupported();

    error AlreadyInitialized();
    error InitializeExchangeRateInvalid();
    error InitializeSetComptrollerFailed(uint256 errorCode);
    error InitializeSetInterestRateModelFailed(uint256 errorCode);
    error InitializeMarketTypeNotSet();
    error InitializeInvalidMarketType();
    error EnsureNonEmptyAmountTooSmall();

    error TransferComptrollerRejection(uint256 errorCode);
    error TransferNotAllowed();
    error TransferNotEnough();
    error TransferTooMuch();
    error TransferInvalidAmount();

    error TransferInFailed();
    error InsufficientBalanceAfterTransfer();
    error TransferOutFailed();

    error MintComptrollerRejection(uint256 errorCode);
    error MintFreshnessCheck();

    error RedeemComptrollerRejection(uint256 errorCode);
    error RedeemFreshnessCheck();
    error RedeemTransferOutNotPossible();
    error RedeemInvalidInputs();

    error BorrowComptrollerRejection(uint256 errorCode);
    error BorrowFreshnessCheck();
    error BorrowCashNotAvailable();

    error RepayBorrowComptrollerRejection(uint256 errorCode);
    error RepayBorrowFreshnessCheck();
    error RepayTooHigh();

    error LiquidateComptrollerRejection(uint256 errorCode);
    error LiquidateFreshnessCheck();
    error LiquidateCollateralFreshnessCheck();
    error LiquidateAccrueBorrowInterestFailed(uint256 errorCode);
    error LiquidateAccrueCollateralInterestFailed(uint256 errorCode);
    error LiquidateLiquidatorIsBorrower();
    error LiquidateCloseAmountIsZero();
    error LiquidateCloseAmountIsUintMax();
    error LiquidateRepayBorrowFreshFailed(uint256 errorCode);

    error LiquidateSeizeComptrollerRejection(uint256 errorCode);
    error LiquidateSeizeLiquidatorIsBorrower();

    error AcceptAdminPendingAdminCheck();

    error SetComptrollerOwnerCheck();
    error SetPendingAdminOwnerCheck();

    error SetReserveFactorAdminCheck();
    error SetReserveFactorFreshCheck();
    error SetReserveFactorBoundsCheck();

    error AddReservesFactorFreshCheck(uint256 actualAddAmount);

    error ReduceReservesAdminCheck();
    error ReduceReservesFreshCheck();
    error ReduceReservesCashNotAvailable();
    error ReduceReservesCashValidation();

    error SetInterestRateModelOwnerCheck();
    error SetInterestRateModelFreshCheck();

    error SetProtocolSeizeShareAdminCheck();
    error SetProtocolSeizeShareTooHigh();

    error BorrowRateIsAbsurdlyHigh(uint borrowRateMantissa);

    error InvalidComptrollerAddress(address comptrollerAddress);
    error InvalidRateModelAddress(address interestRateModelAddress);

    error Reentry();

    error CannotSweepUnderlying();

    error CollectInterestFailed();
    error CollectInterestNotAllowed();
    error PayInterestNotAllowed();
    error InsufficientBalance();
    error PayInterestError();

    error SenderMismatch();
    error ValueMismatch();

    error PriceError();
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

/**
 * @title ERC 20 Token Standard Interface
 *  https://eips.ethereum.org/EIPS/eip-20
 */
interface EIP20Interface {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);

    /**
      * @notice Get the total number of tokens in circulation
      * @return The supply of tokens
      */
    function totalSupply() external view returns (uint256);

    /**
     * @notice Gets the balance of the specified address
     * @param owner The address from which the balance will be retrieved
     * @return balance The balance
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
      * @notice Transfer `amount` tokens from `msg.sender` to `dst`
      * @param dst The address of the destination account
      * @param amount The number of tokens to transfer
      * @return success Whether or not the transfer succeeded
      */
    function transfer(address dst, uint256 amount) external returns (bool success);

    /**
      * @notice Transfer `amount` tokens from `src` to `dst`
      * @param src The address of the source account
      * @param dst The address of the destination account
      * @param amount The number of tokens to transfer
      * @return success Whether or not the transfer succeeded
      */
    function transferFrom(address src, address dst, uint256 amount) external returns (bool success);

    /**
      * @notice Approve `spender` to transfer up to `amount` from `src`
      * @dev This will overwrite the approval amount for `spender`
      *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
      * @param spender The address of the account which may transfer tokens
      * @param amount The number of tokens that are approved (-1 means infinite)
      * @return success Whether or not the approval succeeded
      */
    function approve(address spender, uint256 amount) external returns (bool success);

    /**
      * @notice Get the current allowance from `owner` for `spender`
      * @param owner The address of the account which owns the tokens to be spent
      * @param spender The address of the account which may transfer tokens
      * @return remaining The number of tokens allowed to be spent (-1 means infinite)
      */
    function allowance(address owner, address spender) external view returns (uint256 remaining);

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

/**
 * @title Exponential module for storing fixed-precision decimals
 * @author Compound
 * @notice Exp is a struct which stores decimals with a fixed precision of 18 decimal places.
 *         Thus, if we wanted to store the 5.1, mantissa would store 5.1e18. That is:
 *         `Exp({mantissa: 5100000000000000000})`.
 */
contract ExponentialNoError {
    uint constant expScale = 1e18;
    uint constant doubleScale = 1e36;
    uint constant halfExpScale = expScale/2;
    uint constant mantissaOne = expScale;

    struct Exp {
        uint mantissa;
    }

    struct Double {
        uint mantissa;
    }

    /**
     * @dev Truncates the given exp to a whole number value.
     *      For example, truncate(Exp{mantissa: 15 * expScale}) = 15
     */
    function truncate(Exp memory exp) pure internal returns (uint) {
        // Note: We are not using careful math here as we're performing a division that cannot fail
        return exp.mantissa / expScale;
    }

    /**
     * @dev Multiply an Exp by a scalar, then truncate to return an unsigned integer.
     */
    function mul_ScalarTruncate(Exp memory a, uint scalar) pure internal returns (uint) {
        Exp memory product = mul_(a, scalar);
        return truncate(product);
    }

    /**
     * @dev Multiply an Exp by a scalar, truncate, then add an to an unsigned integer, returning an unsigned integer.
     */
    function mul_ScalarTruncateAddUInt(Exp memory a, uint scalar, uint addend) pure internal returns (uint) {
        Exp memory product = mul_(a, scalar);
        return add_(truncate(product), addend);
    }

    /**
     * @dev Checks if first Exp is less than second Exp.
     */
    function lessThanExp(Exp memory left, Exp memory right) pure internal returns (bool) {
        return left.mantissa < right.mantissa;
    }

    /**
     * @dev Checks if left Exp <= right Exp.
     */
    function lessThanOrEqualExp(Exp memory left, Exp memory right) pure internal returns (bool) {
        return left.mantissa <= right.mantissa;
    }

    /**
     * @dev Checks if left Exp > right Exp.
     */
    function greaterThanExp(Exp memory left, Exp memory right) pure internal returns (bool) {
        return left.mantissa > right.mantissa;
    }

    /**
     * @dev returns true if Exp is exactly zero
     */
    function isZeroExp(Exp memory value) pure internal returns (bool) {
        return value.mantissa == 0;
    }

    function safe224(uint n, string memory errorMessage) pure internal returns (uint224) {
        require(n < 2**224, errorMessage);
        return uint224(n);
    }

    function safe32(uint n, string memory errorMessage) pure internal returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function add_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
        return Exp({mantissa: add_(a.mantissa, b.mantissa)});
    }

    function add_(Double memory a, Double memory b) pure internal returns (Double memory) {
        return Double({mantissa: add_(a.mantissa, b.mantissa)});
    }

    function add_(uint a, uint b) pure internal returns (uint) {
        return a + b;
    }

    function sub_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
        return Exp({mantissa: sub_(a.mantissa, b.mantissa)});
    }

    function sub_(Double memory a, Double memory b) pure internal returns (Double memory) {
        return Double({mantissa: sub_(a.mantissa, b.mantissa)});
    }

    function sub_(uint a, uint b) pure internal returns (uint) {
        return a - b;
    }

    function mul_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
        return Exp({mantissa: mul_(a.mantissa, b.mantissa) / expScale});
    }

    function mul_(Exp memory a, uint b) pure internal returns (Exp memory) {
        return Exp({mantissa: mul_(a.mantissa, b)});
    }

    function mul_(uint a, Exp memory b) pure internal returns (uint) {
        return mul_(a, b.mantissa) / expScale;
    }

    function mul_(Double memory a, Double memory b) pure internal returns (Double memory) {
        return Double({mantissa: mul_(a.mantissa, b.mantissa) / doubleScale});
    }

    function mul_(Double memory a, uint b) pure internal returns (Double memory) {
        return Double({mantissa: mul_(a.mantissa, b)});
    }

    function mul_(uint a, Double memory b) pure internal returns (uint) {
        return mul_(a, b.mantissa) / doubleScale;
    }

    function mul_(uint a, uint b) pure internal returns (uint) {
        return a * b;
    }

    function div_(Exp memory a, Exp memory b) pure internal returns (Exp memory) {
        return Exp({mantissa: div_(mul_(a.mantissa, expScale), b.mantissa)});
    }

    function div_(Exp memory a, uint b) pure internal returns (Exp memory) {
        return Exp({mantissa: div_(a.mantissa, b)});
    }

    function div_(uint a, Exp memory b) pure internal returns (uint) {
        return div_(mul_(a, expScale), b.mantissa);
    }

    function div_(Double memory a, Double memory b) pure internal returns (Double memory) {
        return Double({mantissa: div_(mul_(a.mantissa, doubleScale), b.mantissa)});
    }

    function div_(Double memory a, uint b) pure internal returns (Double memory) {
        return Double({mantissa: div_(a.mantissa, b)});
    }

    function div_(uint a, Double memory b) pure internal returns (uint) {
        return div_(mul_(a, doubleScale), b.mantissa);
    }

    function div_(uint a, uint b) pure internal returns (uint) {
        return a / b;
    }

    function fraction(uint a, uint b) pure internal returns (Double memory) {
        return Double({mantissa: div_(mul_(a, doubleScale), b)});
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "CToken.sol";

abstract contract PriceOracle {
    /// @notice Indicator that this is a PriceOracle contract (for inspection)
    bool public constant isPriceOracle = true;

    /**
      * @notice Get the underlying price of a cToken asset
      * @param cToken The cToken to get the underlying price of
      * @return The underlying asset price mantissa (scaled by 1e18).
      *  Zero means the price is unavailable.
      */
    function getUnderlyingPrice(CToken cToken) virtual external view returns (uint);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "CToken.sol";
import "CErc20InterestMarketInterfaces.sol";
import "PriceOracle.sol";

contract UnitrollerAdminStorage {
    /**
    * @notice Administrator for this contract
    */
    address public admin;

    /**
    * @notice Pending administrator for this contract
    */
    address public pendingAdmin;

    /**
    * @notice Active brains of Unitroller
    */
    address public comptrollerImplementation;

    /**
    * @notice Pending brains of Unitroller
    */
    address public pendingComptrollerImplementation;
}

contract ComptrollerV1Storage is UnitrollerAdminStorage {

    /**
     * @notice Oracle which gives the price of any given asset
     */
    PriceOracle public oracle;

    /**
     * @notice Multiplier used to calculate the maximum repayAmount when liquidating a borrow
     */
    uint public closeFactorMantissa;

    /**
     * @notice Multiplier representing the discount on collateral that a liquidator receives
     */
    uint public liquidationIncentiveMantissa;

    /**
     * @notice Max number of assets a single account can participate in (borrow or use as collateral)
     */
    uint public maxAssets;

    /**
     * @notice Per-account mapping of "assets you are in", capped by maxAssets
     */
    mapping(address => CToken[]) public accountAssets;

}

contract ComptrollerV2Storage is ComptrollerV1Storage {
    struct Market {
        // Whether or not this market is listed
        bool isListed;

        //  Multiplier representing the most one can borrow against their collateral in this market.
        //  For instance, 0.9 to allow borrowing 90% of collateral value.
        //  Must be between 0 and 1, and stored as a mantissa.
        uint collateralFactorMantissa;

        // Per-market mapping of "accounts in this asset"
        mapping(address => bool) accountMembership;

        // Whether or not this market receives COMP
        bool isComped;
    }

    /**
     * @notice Official mapping of cTokens -> Market metadata
     * @dev Used e.g. to determine if a market is supported
     */
    mapping(address => Market) public markets;


    /**
     * @notice The Pause Guardian can pause certain actions as a safety mechanism.
     *  Actions which allow users to remove their own assets cannot be paused.
     *  Liquidation / seizing / transfer can only be paused globally, not by market.
     */
    address public pauseGuardian;
    bool public _mintGuardianPaused;
    bool public _borrowGuardianPaused;
    bool public transferGuardianPaused;
    bool public seizeGuardianPaused;
    bool public collectInterestGuardianPaused;
    bool public payInterestGuardianPaused;
    mapping(address => bool) public mintGuardianPaused;
    mapping(address => bool) public borrowGuardianPaused;
}

contract ComptrollerV3Storage is ComptrollerV2Storage {
    struct CompMarketState {
        // The market's last updated compBorrowIndex or compSupplyIndex
        uint224 index;

        // The block number the index was last updated at
        uint32 block;
    }

    /// @notice A list of all markets
    CToken[] public allMarkets;

    /// @notice The rate at which the flywheel distributes COMP, per block
    uint public compRate;

    /// @notice The portion of compRate that each market currently receives
    mapping(address => uint) public compSpeeds;

    /// @notice The COMP market supply state for each market
    mapping(address => CompMarketState) public compSupplyState;

    /// @notice The COMP market borrow state for each market
    mapping(address => CompMarketState) public compBorrowState;

    /// @notice The COMP borrow index for each market for each supplier as of the last time they accrued COMP
    mapping(address => mapping(address => uint)) public compSupplierIndex;

    /// @notice The COMP borrow index for each market for each borrower as of the last time they accrued COMP
    mapping(address => mapping(address => uint)) public compBorrowerIndex;

    /// @notice The COMP accrued but not yet transferred to each user
    mapping(address => uint) public compAccrued;
}

contract ComptrollerV4Storage is ComptrollerV3Storage {
    // @notice The borrowCapGuardian can set borrowCaps to any number for any market. Lowering the borrow cap could disable borrowing on the given market.
    address public borrowCapGuardian;

    // @notice Borrow caps enforced by borrowAllowed for each cToken address. Defaults to zero which corresponds to unlimited borrowing.
    mapping(address => uint) public borrowCaps;
}

contract ComptrollerV5Storage is ComptrollerV4Storage {
    /// @notice The portion of COMP that each contributor receives per block
    mapping(address => uint) public compContributorSpeeds;

    /// @notice Last block at which a contributor's COMP rewards have been allocated
    mapping(address => uint) public lastContributorBlock;
}

contract ComptrollerV6Storage is ComptrollerV5Storage {
    /// @notice The rate at which comp is distributed to the corresponding borrow market (per block)
    mapping(address => uint) public compBorrowSpeeds;

    /// @notice The rate at which comp is distributed to the corresponding supply market (per block)
    mapping(address => uint) public compSupplySpeeds;
}

contract ComptrollerV7Storage is ComptrollerV6Storage {
    /// @notice Flag indicating whether the function to fix COMP accruals has been executed (RE: proposal 62 bug)
    bool public proposal65FixExecuted;

    /// @notice Accounting storage mapping account addresses to how much COMP they owe the protocol.
    mapping(address => uint) public compReceivable;
}

contract ComptrollerV8Storage is ComptrollerV7Storage {
    /**
     * @dev Guard variable for re-entrancy checks
     */
    bool internal _notEntered;

    mapping(address => bool) public whitelist;

    address internal _interestMarket;

    /**
     * @notice Per-account mapping of "ERC721 assets you are in", capped by maxAssets
     */
    mapping(address => CToken[]) public accountAssetsErc721;

    /*** Reentrancy Guard ***/

    error Reentry();

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     */
    modifier nonReentrant() {
        if (!_notEntered) {
            revert Reentry();
        }
        _notEntered = false;
        _;
        _notEntered = true; // get a gas-refund post-Istanbul
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "CTokenInterfaces.sol";


contract CErc20InterestMarketStorage {

    uint public totalVirtual;
}

abstract contract CErc20InterestMarketInterface is CErc20Interface, CErc20InterestMarketStorage {

    /**
     * @notice Collect the interest from supplied ERC721 tokens for the lender and adds them to his supply.
     *         Must be called by the supply market.
     * @param lender The address for which the interest should be collected
     * @param interestTokens The amount of market tokens to claim
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function collectInterest(address lender, uint interestTokens) virtual external returns (uint);

    /**
     * @notice Pay the interest for borrowed ERC721 tokens.
     *         Must be called by the borrow market.
     * @param payer The address that pays the interest
     * @param interestTokens The amount of market tokens to pay
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function payInterest(address payer, uint interestTokens) virtual external returns (uint);

    /**
     * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for the underlying asset
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param redeemTokens The number of cTokens to redeem into underlying
     * @param cTokens The list of cToken addresses to redeem interest from.
     *                Only possible for cErc721 markets.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function redeemWithClaim(uint redeemTokens, address[] memory cTokens) virtual external returns (uint);

    /**
     * @notice Sender claims interest from NFT markets then redeems cTokens in exchange for a specified amount of underlying asset
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param redeemAmount The amount of underlying to redeem
     * @param cTokens The list of cToken addresses to redeem interest from.
     *                Only possible for cErc721 markets.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function redeemUnderlyingWithClaim(uint redeemAmount, address[] memory cTokens) virtual external returns (uint);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "ErrorReporter.sol";
import "ComptrollerStorage.sol";

/**
 * @title ComptrollerCore
 * @dev Storage for the comptroller is at this address, while execution is delegated to the `comptrollerImplementation`.
 * CTokens should reference this contract as their comptroller.
 */
contract Unitroller is UnitrollerAdminStorage, ComptrollerErrorReporter {

    /**
      * @notice Emitted when pendingComptrollerImplementation is changed
      */
    event NewPendingImplementation(address oldPendingImplementation, address newPendingImplementation);

    /**
      * @notice Emitted when pendingComptrollerImplementation is accepted, which means comptroller implementation is updated
      */
    event NewImplementation(address oldImplementation, address newImplementation);

    /**
      * @notice Emitted when pendingAdmin is changed
      */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
      * @notice Emitted when pendingAdmin is accepted, which means admin is updated
      */
    event NewAdmin(address oldAdmin, address newAdmin);

    constructor() public {
        // Set admin to caller
        admin = msg.sender;
    }

    /*** Admin Functions ***/

    function initialize() public {
        if (msg.sender != address(this) && msg.sender != admin) {
            revert Unauthorized();
        }

        (bool success,) = comptrollerImplementation.delegatecall(abi.encodeWithSignature("initialize()"));
        if (!success) {
            revert InitializationFailed();
        }
    }

    function _setPendingImplementation(address newPendingImplementation) public returns (uint) {

        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_IMPLEMENTATION_OWNER_CHECK);
        }

        address oldPendingImplementation = pendingComptrollerImplementation;

        pendingComptrollerImplementation = newPendingImplementation;

        emit NewPendingImplementation(oldPendingImplementation, pendingComptrollerImplementation);

        return uint(Error.NO_ERROR);
    }

    /**
    * @notice Accepts new implementation of comptroller. msg.sender must be pendingImplementation
    * @dev Admin function for new implementation to accept it's role as implementation
    * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
    */
    function _acceptImplementation() public returns (uint) {
        // Check caller is pendingImplementation and pendingImplementation ≠ address(0)
        if (msg.sender != pendingComptrollerImplementation || pendingComptrollerImplementation == address(0)) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK);
        }

        // Save current values for inclusion in log
        address oldImplementation = comptrollerImplementation;
        address oldPendingImplementation = pendingComptrollerImplementation;

        comptrollerImplementation = pendingComptrollerImplementation;

        pendingComptrollerImplementation = address(0);

        // calls externally to change context to unitroller
        Unitroller(this).initialize();

        emit NewImplementation(oldImplementation, comptrollerImplementation);
        emit NewPendingImplementation(oldPendingImplementation, pendingComptrollerImplementation);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
      * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
      * @param newPendingAdmin New pending admin.
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _setPendingAdmin(address newPendingAdmin) public returns (uint) {
        // Check caller = admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK);
        }

        // Save current value, if any, for inclusion in log
        address oldPendingAdmin = pendingAdmin;

        // Store pendingAdmin with value newPendingAdmin
        pendingAdmin = newPendingAdmin;

        // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
        emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);

        return uint(Error.NO_ERROR);
    }

    /**
      * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
      * @dev Admin function for pending admin to accept role and update admin
      * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
      */
    function _acceptAdmin() public returns (uint) {
        // Check caller is pendingAdmin and pendingAdmin ≠ address(0)
        if (msg.sender != pendingAdmin || msg.sender == address(0)) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_ADMIN_PENDING_ADMIN_CHECK);
        }

        // Save current values for inclusion in log
        address oldAdmin = admin;
        address oldPendingAdmin = pendingAdmin;

        // Store admin with value pendingAdmin
        admin = pendingAdmin;

        // Clear the pending value
        pendingAdmin = address(0);

        emit NewAdmin(oldAdmin, admin);
        emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);

        return uint(Error.NO_ERROR);
    }

    /**
     * @dev Delegates execution to an implementation contract.
     * It returns to the external caller whatever the implementation returns
     * or forwards reverts.
     */
    fallback() external payable {
        // delegate all other functions to current implementation
        (bool success, ) = comptrollerImplementation.delegatecall(msg.data);

        assembly {
              let free_mem_ptr := mload(0x40)
              returndatacopy(free_mem_ptr, 0, returndatasize())

              switch success
              case 0 { revert(free_mem_ptr, returndatasize()) }
              default { return(free_mem_ptr, returndatasize()) }
        }
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "CErc20InterestMarketInterfaces.sol";

contract CErc721Storage {

    /**
     * @notice NFTs supplied
     */
    uint[] public heldNFTs;

    /**
     * @notice Accumulator of the total earned interest rate by suppliers since the opening of the market
     */
    uint public supplyIndex;

    struct SupplyInterestSnapshot {
        uint interestIndex;
        uint interestAccrued;
    }
    mapping(address => SupplyInterestSnapshot) internal supplyInterest;
}

abstract contract CErc721Interface is CErc20Interface, CErc721Storage {

    /**
     * @notice Event emitted when interest tokens are redeemed
     */
    event RedeemInterest(address redeemer, uint redeemInterest, uint redeemTokens);

    /**
     * @notice Not supported. Use mint(uint[]) instead.
     */
    function mint(uint) override external returns (uint) {
        revert("unsupported");
    }
    /**
     * @notice Sender supplies assets into the market and receives cTokens in exchange
     * @dev Accrues interest whether or not the operation succeeds, unless reverted
     * @param nftIds The NFT IDs to supply
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function mint(uint[] memory nftIds) virtual external returns (uint);

    /**
     * @notice Redeems the interest accrued from the supplied assets. Owed interest will also be paid from this amount.
     * @param redeemer The address to redeem the interest for
     *                 If the caller is not the comptroller the sender is the redeemer.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function redeemInterest(address redeemer) virtual external returns (uint);

    /**
     * @notice Redeems the interest accrued from the supplied assets. Owed interest will also be paid from this amount.
     * @param redeemer The address to redeem the interest for
     *                 Only the comptroller can call.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _redeemInterestForLiquidation(address redeemer) virtual external returns (uint);

    /**
     * @notice Not supported. Use repayBorrow(uint[], uint) instead.
     */
    function repayBorrow(uint) override external returns (uint) {
        revert("unsupported");
    }
    /**
     * @notice Sender repays their own borrow
     * @param nftIds The NFT IDs to be used for the repayment
     * @param repayInterest The min amount of interest to be repaid in interest market units
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function repayBorrow(uint[] memory nftIds, uint repayInterest) virtual external returns (uint);

    /**
     * @notice Not supported. Use repayBorrowBehalf(address, uint[], uint) instead.
     */
    function repayBorrowBehalf(address, uint) override external returns (uint) {
        revert("unsupported");
    }
    /**
     * @notice Repays a loan on behalf of another user
     * @param borrower The account with the debt being payed off
     * @param nftIds The NFT IDs to be used for the repayment
     * @param repayInterest The min amount of interest to be repaid in interest market units
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function repayBorrowBehalf(address borrower, uint[] memory nftIds, uint repayInterest) virtual external returns (uint);

    /**
     * @notice Not supported.
     */
    function _addReserves(uint addAmount) override external returns (uint) {
        revert("unsupported");
    }

    /**
     * @notice Not supported. Use _liquidateBorrow(address, address, uint[]) instead.
     */
    function _liquidateBorrow(address liquidator, address borrower, uint repayAmount) override external returns (uint) {
        revert("unsupported");
    }
    /**
     * @notice The liquidator liquidates the borrowers collateral.
     *         This function can only be called by the Comptroller.
     * @param liquidator The liquidator who called Comptroller::batchLiquidateBorrow
     * @param borrower The borrower of this cToken to be liquidated
     * @param nftIds The NFT IDs of the underlying borrowed asset to repay
     * @return uint The amount of the underlying borrowed asset that was actually repaid
     */
    function _liquidateBorrow(address liquidator, address borrower, uint[] memory nftIds) virtual external returns (uint);

    event Mint(address minter, uint mintAmount, uint mintTokens, uint[] nftIds);
    event Redeem(address redeemer, uint redeemAmount, uint redeemTokens, uint[] nftIds);
    event Borrow(address borrower, uint[] nftIds, uint accountBorrows, uint totalBorrows);
    event RepayBorrow(address payer, address borrower, uint[] nftIds, uint repayInterest, uint accountBorrows, uint totalBorrows);
    event LiquidateBorrow(address liquidator, address borrower, uint[] nftIds, uint repayInterest);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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