// File: @gearbox-protocol/core-v2/contracts/pool/PoolService.sol



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

import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import { ACLTrait } from "../core/ACLTrait.sol";

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

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

import { IInterestRateModel } from "../interfaces/IInterestRateModel.sol";
import { IPoolService } from "../interfaces/IPoolService.sol";
import { ICreditManagerV2 } from "../interfaces/ICreditManagerV2.sol";

import { AddressProvider } from "../core/AddressProvider.sol";
import { DieselToken } from "../tokens/DieselToken.sol";
import { SECONDS_PER_YEAR, MAX_WITHDRAW_FEE } from "../libraries/Constants.sol";
import { Errors } from "../libraries/Errors.sol";

/// @title Pool Service Interface
/// @notice Implements business logic:
///   - Adding/removing pool liquidity
///   - Managing diesel tokens & diesel rates
///   - Taking/repaying Credit Manager debt
///
/// More: https://dev.gearbox.fi/developers/pools/pool-service
contract PoolService is IPoolService, ACLTrait, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using PercentageMath for uint256;

    /// @dev Expected liquidity at last update (LU)
    uint256 public _expectedLiquidityLU;

    /// @dev The limit on expected (total) liquidity
    uint256 public override expectedLiquidityLimit;

    /// @dev Total borrowed amount
    /// @notice https://dev.gearbox.fi/developers/pools/economy/total-borrowed
    uint256 public override totalBorrowed;

    /// @dev Address provider
    AddressProvider public override addressProvider;

    /// @dev Interest rate model
    IInterestRateModel public interestRateModel;

    /// @dev The pool's underlying asset
    address public override underlyingToken;

    /// @dev Diesel(LP) token address
    address public immutable override dieselToken;

    /// @dev Map from Credit Manager addresses to the status of their ability to borrow
    mapping(address => bool) public override creditManagersCanBorrow;

    /// @dev Map from Credit Manager addresses to the status of their ability to repay
    mapping(address => bool) public creditManagersCanRepay;

    /// @dev The list of all Credit Managers
    address[] public override creditManagers;

    /// @dev Address of the protocol treasury
    address public treasuryAddress;

    /// @dev The cumulative interest index at last update
    uint256 public override _cumulativeIndex_RAY;

    /// @dev The current borrow rate
    /// @notice https://dev.gearbox.fi/developers/pools/economy#borrow-apy
    uint256 public override borrowAPY_RAY;

    /// @dev Timestamp of last update
    uint256 public override _timestampLU;

    /// @dev Withdrawal fee in PERCENTAGE FORMAT
    uint256 public override withdrawFee;

    /// @dev Contract version
    uint256 public constant override version = 1;

    //
    // CONSTRUCTOR
    //

    /// @dev Constructor
    /// @param _addressProvider Address provider
    /// @param _underlyingToken Address of the underlying token
    /// @param _interestRateModelAddress Address of the initial interest rate model
    constructor(
        address _addressProvider,
        address _underlyingToken,
        address _interestRateModelAddress,
        uint256 _expectedLiquidityLimit
    ) ACLTrait(_addressProvider) {
        require(
            _addressProvider != address(0) &&
                _underlyingToken != address(0) &&
                _interestRateModelAddress != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        );

        addressProvider = AddressProvider(_addressProvider);

        underlyingToken = _underlyingToken;

        dieselToken = address(
            new DieselToken(
                string(
                    abi.encodePacked(
                        "diesel ",
                        IERC20Metadata(_underlyingToken).name()
                    )
                ),
                string(
                    abi.encodePacked(
                        "d",
                        IERC20Metadata(_underlyingToken).symbol()
                    )
                ),
                IERC20Metadata(_underlyingToken).decimals()
            )
        );

        treasuryAddress = addressProvider.getTreasuryContract();

        _timestampLU = block.timestamp;
        _cumulativeIndex_RAY = RAY; // T:[PS-5]
        _updateInterestRateModel(_interestRateModelAddress);
        expectedLiquidityLimit = _expectedLiquidityLimit;
    }

    //
    // LIQUIDITY MANAGEMENT
    //

    /**
     * @dev Adds liquidity to the pool
     * - Transfers the underlying asset from sender to the pool
     * - Mints diesel (LP) token фе current diesel rate
     * - Updates expected liquidity
     * - Updates borrow rate
     *
     * More: https://dev.gearbox.fi/developers/pools/pool-service#addliquidity
     *
     * @param amount Amount of tokens to be deposited
     * @param onBehalfOf The address that will receive the dToken
     * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
     *   0 if the action is executed directly by the user, without a facilitator.
     *
     * #if_succeeds {:msg "After addLiquidity() the pool gets the correct amoung of underlyingToken(s)"}
     *      IERC20(underlyingToken).balanceOf(address(this)) == old(IERC20(underlyingToken).balanceOf(address(this))) + amount;
     * #if_succeeds {:msg "After addLiquidity() onBehalfOf gets the right amount of dieselTokens"}
     *      IERC20(dieselToken).balanceOf(onBehalfOf) == old(IERC20(dieselToken).balanceOf(onBehalfOf)) + old(toDiesel(amount));
     * #if_succeeds {:msg "After addLiquidity() borrow rate decreases"}
     *      amount > 0 ==> borrowAPY_RAY <= old(currentBorrowRate());
     * #limit {:msg "Not more than 1 day since last borrow rate update"} block.timestamp <= _timestampLU + 3600 * 24;
     */
    function addLiquidity(
        uint256 amount,
        address onBehalfOf,
        uint256 referralCode
    )
        external
        override
        whenNotPaused // T:[PS-4]
        nonReentrant
    {
        require(onBehalfOf != address(0), Errors.ZERO_ADDRESS_IS_NOT_ALLOWED);

        require(
            expectedLiquidity() + amount <= expectedLiquidityLimit,
            Errors.POOL_MORE_THAN_EXPECTED_LIQUIDITY_LIMIT
        ); // T:[PS-31]

        uint256 balanceBefore = IERC20(underlyingToken).balanceOf(
            address(this)
        );

        IERC20(underlyingToken).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        ); // T:[PS-2, 7]

        amount =
            IERC20(underlyingToken).balanceOf(address(this)) -
            balanceBefore; // T:[FT-1]

        DieselToken(dieselToken).mint(onBehalfOf, toDiesel(amount)); // T:[PS-2, 7]

        _expectedLiquidityLU = _expectedLiquidityLU + amount; // T:[PS-2, 7]
        _updateBorrowRate(0); // T:[PS-2, 7]

        emit AddLiquidity(msg.sender, onBehalfOf, amount, referralCode); // T:[PS-2, 7]
    }

    /**
     * @dev Removes liquidity from pool
     * - Transfers to the sender the underlying amount equivalent to the passed Diesel amount
     * - Burns Diesel tokens
     * - Subtracts the removed underlying from expectedLiquidity
     * - Updates borrow rate
     *
     * More: https://dev.gearbox.fi/developers/pools/pool-service#removeliquidity
     *
     * @param amount Amount of Diesel tokens to burn
     * @param to Address to transfer the underlying to
     *
     * #if_succeeds {:msg "For removeLiquidity() sender must have sufficient diesel"}
     *      old(DieselToken(dieselToken).balanceOf(msg.sender)) >= amount;
     * #if_succeeds {:msg "After removeLiquidity() `to` gets the liquidity in underlyingToken(s)"}
     *      (to != address(this) && to != treasuryAddress) ==>
     *          IERC20(underlyingToken).balanceOf(to) == old(IERC20(underlyingToken).balanceOf(to) + (let t:= fromDiesel(amount) in t.sub(t.percentMul(withdrawFee))));
     * #if_succeeds {:msg "After removeLiquidity() treasury gets the withdraw fee in underlyingToken(s)"}
     *      (to != address(this) && to != treasuryAddress) ==>
     *          IERC20(underlyingToken).balanceOf(treasuryAddress) == old(IERC20(underlyingToken).balanceOf(treasuryAddress) + fromDiesel(amount).percentMul(withdrawFee));
     * #if_succeeds {:msg "After removeLiquidity() borrow rate increases"}
     *      (to != address(this) && amount > 0) ==> borrowAPY_RAY >= old(currentBorrowRate());
     * #limit {:msg "Not more than 1 day since last borrow rate update"} block.timestamp <= _timestampLU + 3600 * 24;
     */
    function removeLiquidity(uint256 amount, address to)
        external
        override
        whenNotPaused // T:[PS-4]
        nonReentrant
        returns (uint256)
    {
        require(to != address(0), Errors.ZERO_ADDRESS_IS_NOT_ALLOWED);

        uint256 underlyingTokensAmount = fromDiesel(amount); // T:[PS-3, 8]

        uint256 amountTreasury = underlyingTokensAmount.percentMul(withdrawFee);
        uint256 amountSent = underlyingTokensAmount - amountTreasury;

        IERC20(underlyingToken).safeTransfer(to, amountSent); // T:[PS-3, 34]

        if (amountTreasury > 0) {
            IERC20(underlyingToken).safeTransfer(
                treasuryAddress,
                amountTreasury
            );
        } // T:[PS-3, 34]

        DieselToken(dieselToken).burn(msg.sender, amount); // T:[PS-3, 8]

        _expectedLiquidityLU = _expectedLiquidityLU - underlyingTokensAmount; // T:[PS-3, 8]
        _updateBorrowRate(0); // T:[PS-3,8 ]

        emit RemoveLiquidity(msg.sender, to, amount); // T:[PS-3, 8]

        return amountSent;
    }

    /// @dev Returns expected liquidity - the amount of money that should be in the pool
    /// after all users close their Credit accounts and fully repay debts
    ///
    /// More: https://dev.gearbox.fi/developers/pools/economy#expected-liquidity
    function expectedLiquidity() public view override returns (uint256) {
        // timeDifference = blockTime - previous timeStamp
        uint256 timeDifference = block.timestamp - _timestampLU;

        //                                    currentBorrowRate * timeDifference
        //  interestAccrued = totalBorrow *  ------------------------------------
        //                                             SECONDS_PER_YEAR
        //
        uint256 interestAccrued = (totalBorrowed *
            borrowAPY_RAY *
            timeDifference) /
            RAY /
            SECONDS_PER_YEAR; // T:[PS-29]

        return _expectedLiquidityLU + interestAccrued; // T:[PS-29]
    }

    /// @dev Returns available liquidity in the pool (pool balance)
    /// More: https://dev.gearbox.fi/developers/
    function availableLiquidity() public view override returns (uint256) {
        return IERC20(underlyingToken).balanceOf(address(this));
    }

    //
    // CREDIT ACCOUNT LENDING
    //

    /// @dev Lends funds to a Credit Account and updates the pool parameters
    /// More: https://dev.gearbox.fi/developers/pools/pool-service#lendcreditAccount
    ///
    /// @param borrowedAmount Credit Account's debt principal
    /// @param creditAccount Credit Account's address
    ///
    /// #if_succeeds {:msg "After lendCreditAccount() borrow rate increases"}
    ///      borrowedAmount > 0 ==> borrowAPY_RAY >= old(currentBorrowRate());
    /// #limit {:msg "Not more than 1 day since last borrow rate update"} block.timestamp <= _timestampLU + 3600 * 24;
    function lendCreditAccount(uint256 borrowedAmount, address creditAccount)
        external
        override
        whenNotPaused // T:[PS-4]
    {
        require(
            creditManagersCanBorrow[msg.sender],
            Errors.POOL_CONNECTED_CREDIT_MANAGERS_ONLY
        ); // T:[PS-12, 13]

        // Transfer funds to credit account
        IERC20(underlyingToken).safeTransfer(creditAccount, borrowedAmount); // T:[PS-14]

        // Update borrow Rate
        _updateBorrowRate(0); // T:[PS-17]

        // Increase total borrowed amount
        totalBorrowed = totalBorrowed + borrowedAmount; // T:[PS-16]

        emit Borrow(msg.sender, creditAccount, borrowedAmount); // T:[PS-15]
    }

    /// @dev Registers Credit Account's debt repayment and updates parameters
    /// More: https://dev.gearbox.fi/developers/pools/pool-service#repaycreditAccount
    ///
    /// @param borrowedAmount Amount of principal ro repay
    /// @param profit The treasury profit from repayment
    /// @param loss Amount of underlying that the CA wan't able to repay
    /// @notice Assumes that the underlying (including principal + interest + fees)
    ///         was already transferred
    ///
    /// #if_succeeds {:msg "Cant have both profit and loss"} !(profit > 0 && loss > 0);
    /// #if_succeeds {:msg "After repayCreditAccount() if we are profitabe, or treasury can cover the losses, diesel rate doesn't decrease"}
    ///      (profit > 0 || toDiesel(loss) >= DieselToken(dieselToken).balanceOf(treasuryAddress)) ==> getDieselRate_RAY() >= old(getDieselRate_RAY());
    /// #limit {:msg "Not more than 1 day since last borrow rate update"} block.timestamp <= _timestampLU + 3600 * 24;
    function repayCreditAccount(
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    )
        external
        override
        whenNotPaused // T:[PS-4]
    {
        require(
            creditManagersCanRepay[msg.sender],
            Errors.POOL_CONNECTED_CREDIT_MANAGERS_ONLY
        ); // T:[PS-12]

        // For fee surplus we mint tokens for treasury
        if (profit > 0) {
            // T:[PS-22] provess that diesel rate will be the same within the margin of error
            DieselToken(dieselToken).mint(treasuryAddress, toDiesel(profit)); // T:[PS-21, 22]
            _expectedLiquidityLU = _expectedLiquidityLU + profit; // T:[PS-21, 22]
        }
        // If returned money < borrowed amount + interest accrued
        // it tries to compensate loss by burning diesel (LP) tokens
        // from treasury fund
        else {
            uint256 amountToBurn = toDiesel(loss); // T:[PS-19,20]

            uint256 treasuryBalance = DieselToken(dieselToken).balanceOf(
                treasuryAddress
            ); // T:[PS-19,20]

            if (treasuryBalance < amountToBurn) {
                amountToBurn = treasuryBalance;
                emit UncoveredLoss(
                    msg.sender,
                    loss - fromDiesel(treasuryBalance)
                ); // T:[PS-23]
            }

            // If treasury has enough funds, it just burns needed amount
            // to keep diesel rate on the same level
            DieselToken(dieselToken).burn(treasuryAddress, amountToBurn); // T:[PS-19, 20]

            //            _expectedLiquidityLU = _expectedLiquidityLU.sub(loss); //T:[PS-19,20]
        }

        // Update available liquidity
        _updateBorrowRate(loss); // T:[PS-19, 20, 21]

        // Reduce total borrowed. Should be after _updateBorrowRate() for correct calculations
        totalBorrowed -= borrowedAmount; // T:[PS-19, 20]

        emit Repay(msg.sender, borrowedAmount, profit, loss); // T:[PS-18]
    }

    //
    // INTEREST RATE MANAGEMENT
    //

    /**
     * @dev Calculates the most current value of the cumulative interest index
     *
     *                              /     currentBorrowRate * timeDifference \
     *  newIndex  = currentIndex * | 1 + ------------------------------------ |
     *                              \              SECONDS_PER_YEAR          /
     *
     * @return current cumulative index in RAY
     */
    function calcLinearCumulative_RAY() public view override returns (uint256) {
        //solium-disable-next-line
        uint256 timeDifference = block.timestamp - _timestampLU; // T:[PS-28]

        return
            calcLinearIndex_RAY(
                _cumulativeIndex_RAY,
                borrowAPY_RAY,
                timeDifference
            ); // T:[PS-28]
    }

    /// @dev Calculates a new cumulative index value from the initial value, borrow rate and time elapsed
    /// @param cumulativeIndex_RAY Cumulative index at last update, in RAY
    /// @param currentBorrowRate_RAY Current borrow rate, in RAY
    /// @param timeDifference Time elapsed since last update, in seconds
    function calcLinearIndex_RAY(
        uint256 cumulativeIndex_RAY,
        uint256 currentBorrowRate_RAY,
        uint256 timeDifference
    ) public pure returns (uint256) {
        //                               /     currentBorrowRate * timeDifference \
        //  newIndex  = currentIndex *  | 1 + ------------------------------------ |
        //                               \              SECONDS_PER_YEAR          /
        //
        uint256 linearAccumulated_RAY = RAY +
            (currentBorrowRate_RAY * timeDifference) /
            SECONDS_PER_YEAR; // T:[GM-2]

        return (cumulativeIndex_RAY * linearAccumulated_RAY) / RAY; // T:[GM-2]
    }

    /// @dev Updates the borrow rate when liquidity parameters are changed
    /// @param loss The loss incurred by the pool on last parameter update, if any
    function _updateBorrowRate(uint256 loss) internal {
        // Update total _expectedLiquidityLU

        _expectedLiquidityLU = expectedLiquidity() - loss; // T:[PS-27]

        // Update cumulativeIndex
        _cumulativeIndex_RAY = calcLinearCumulative_RAY(); // T:[PS-27]

        // update borrow APY
        borrowAPY_RAY = interestRateModel.calcBorrowRate(
            _expectedLiquidityLU,
            availableLiquidity()
        ); // T:[PS-27]
        _timestampLU = block.timestamp; // T:[PS-27]
    }

    //
    // DIESEL TOKEN MGMT
    //

    /// @dev Returns the current exchange rate of Diesel tokens to underlying
    /// More info: https://dev.gearbox.fi/developers/pools/economy#diesel-rate
    function getDieselRate_RAY() public view override returns (uint256) {
        uint256 dieselSupply = IERC20(dieselToken).totalSupply();
        if (dieselSupply == 0) return RAY; // T:[PS-1]
        return (expectedLiquidity() * RAY) / dieselSupply; // T:[PS-6]
    }

    /// @dev Converts a quantity of the underlying to Diesel tokens
    /// @param amount Amount in underlyingToken tokens to be converted to diesel tokens
    function toDiesel(uint256 amount) public view override returns (uint256) {
        return (amount * RAY) / getDieselRate_RAY(); // T:[PS-24]
    }

    /// @dev Converts a quantity of Diesel tokens to the underlying
    /// @param amount Amount in diesel tokens to be converted to diesel tokens
    function fromDiesel(uint256 amount) public view override returns (uint256) {
        return (amount * getDieselRate_RAY()) / RAY; // T:[PS-24]
    }

    //
    // CONFIGURATION
    //

    /// @dev Connects a new Credit manager to pool
    /// @param _creditManager Address of the Credit Manager
    function connectCreditManager(address _creditManager)
        external
        configuratorOnly // T:[PS-9]
    {
        require(
            address(this) == ICreditManagerV2(_creditManager).poolService(),
            Errors.POOL_INCOMPATIBLE_CREDIT_ACCOUNT_MANAGER
        ); // T:[PS-10]

        require(
            !creditManagersCanRepay[_creditManager],
            Errors.POOL_CANT_ADD_CREDIT_MANAGER_TWICE
        ); // T:[PS-35]

        creditManagersCanBorrow[_creditManager] = true; // T:[PS-11]
        creditManagersCanRepay[_creditManager] = true; // T:[PS-11]
        creditManagers.push(_creditManager); // T:[PS-11]
        emit NewCreditManagerConnected(_creditManager); // T:[PS-11]
    }

    /// @dev Forbids a Credit Manager to borrow
    /// @param _creditManager Address of the Credit Manager
    function forbidCreditManagerToBorrow(address _creditManager)
        external
        configuratorOnly // T:[PS-9]
    {
        creditManagersCanBorrow[_creditManager] = false; // T:[PS-13]
        emit BorrowForbidden(_creditManager); // T:[PS-13]
    }

    /// @dev Sets the new interest rate model for the pool
    /// @param _interestRateModel Address of the new interest rate model contract
    /// #limit {:msg "Disallow updating the interest rate model after the constructor"} address(interestRateModel) == address(0x0);
    function updateInterestRateModel(address _interestRateModel)
        public
        configuratorOnly // T:[PS-9]
    {
        _updateInterestRateModel(_interestRateModel);
    }

    /// @dev IMPLEMENTATION: updateInterestRateModel
    function _updateInterestRateModel(address _interestRateModel) internal {
        require(
            _interestRateModel != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        );
        interestRateModel = IInterestRateModel(_interestRateModel); // T:[PS-25]
        _updateBorrowRate(0); // T:[PS-26]
        emit NewInterestRateModel(_interestRateModel); // T:[PS-25]
    }

    /// @dev Sets a new expected liquidity limit
    /// @param newLimit New expected liquidity limit
    function setExpectedLiquidityLimit(uint256 newLimit)
        external
        configuratorOnly // T:[PS-9]
    {
        expectedLiquidityLimit = newLimit; // T:[PS-30]
        emit NewExpectedLiquidityLimit(newLimit); // T:[PS-30]
    }

    /// @dev Sets a new withdrawal fee
    /// @param fee The new fee amount, in bp
    function setWithdrawFee(uint256 fee)
        public
        configuratorOnly // T:[PS-9]
    {
        require(fee <= MAX_WITHDRAW_FEE, Errors.POOL_INCORRECT_WITHDRAW_FEE); // T:[PS-32]
        withdrawFee = fee; // T:[PS-33]
        emit NewWithdrawFee(fee); // T:[PS-33]
    }

    /// @dev Returns the number of connected Credit Managers
    function creditManagersCount() external view override returns (uint256) {
        return creditManagers.length; // T:[PS-11]
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



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

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: @gearbox-protocol/core-v2/contracts/core/ACLTrait.sol



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

import { Pausable } from "@openzeppelin/contracts/security/Pausable.sol";
import { AddressProvider } from "./AddressProvider.sol";
import { IACL } from "../interfaces/IACL.sol";
import { ZeroAddressException, CallerNotConfiguratorException, CallerNotPausableAdminException, CallerNotUnPausableAdminException } from "../interfaces/IErrors.sol";

/// @title ACL Trait
/// @notice Utility class for ACL consumers
abstract contract ACLTrait is Pausable {
    // ACL contract to check rights
    IACL public immutable _acl;

    /// @dev constructor
    /// @param addressProvider Address of address repository
    constructor(address addressProvider) {
        if (addressProvider == address(0)) revert ZeroAddressException(); // F:[AA-2]

        _acl = IACL(AddressProvider(addressProvider).getACL());
    }

    /// @dev  Reverts if msg.sender is not configurator
    modifier configuratorOnly() {
        if (!_acl.isConfigurator(msg.sender))
            revert CallerNotConfiguratorException();
        _;
    }

    ///@dev Pause contract
    function pause() external {
        if (!_acl.isPausableAdmin(msg.sender))
            revert CallerNotPausableAdminException();
        _pause();
    }

    /// @dev Unpause contract
    function unpause() external {
        if (!_acl.isUnpausableAdmin(msg.sender))
            revert CallerNotUnPausableAdminException();

        _unpause();
    }
}

// File: @gearbox-protocol/core-v2/contracts/libraries/Constants.sol



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

// Denominations

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

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

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

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

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

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

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

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

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

// OPERATIONS

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

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

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

address constant UNIVERSAL_CONTRACT = 0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC;

// File: @gearbox-protocol/core-v2/contracts/libraries/PercentageMath.sol



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

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

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

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

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

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IInterestRateModel.sol



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

interface IInterestRateModel is IVersion {
    /// @dev Returns the borrow rate calculated based on expectedLiquidity and availableLiquidity
    /// @param expectedLiquidity Expected liquidity in the pool
    /// @param availableLiquidity Available liquidity in the pool
    /// @notice In RAY format
    function calcBorrowRate(
        uint256 expectedLiquidity,
        uint256 availableLiquidity
    ) external view returns (uint256);
}

// File: @gearbox-protocol/core-v2/contracts/core/AddressProvider.sol



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

import { IAddressProvider } from "../interfaces/IAddressProvider.sol";
import { Claimable } from "./access/Claimable.sol";
import { Errors } from "../libraries/Errors.sol";

// Repositories & services
bytes32 constant CONTRACTS_REGISTER = "CONTRACTS_REGISTER";
bytes32 constant ACL = "ACL";
bytes32 constant PRICE_ORACLE = "PRICE_ORACLE";
bytes32 constant ACCOUNT_FACTORY = "ACCOUNT_FACTORY";
bytes32 constant DATA_COMPRESSOR = "DATA_COMPRESSOR";
bytes32 constant TREASURY_CONTRACT = "TREASURY_CONTRACT";
bytes32 constant GEAR_TOKEN = "GEAR_TOKEN";
bytes32 constant WETH_TOKEN = "WETH_TOKEN";
bytes32 constant WETH_GATEWAY = "WETH_GATEWAY";
bytes32 constant LEVERAGED_ACTIONS = "LEVERAGED_ACTIONS";

/// @title AddressRepository
/// @notice Stores addresses of deployed contracts
contract AddressProvider is Claimable, IAddressProvider {
    // Mapping from contract keys to respective addresses
    mapping(bytes32 => address) public addresses;

    // Contract version
    uint256 public constant version = 2;

    constructor() {
        // @dev Emits first event for contract discovery
        emit AddressSet("ADDRESS_PROVIDER", address(this));
    }

    /// @return Address of ACL contract
    function getACL() external view returns (address) {
        return _getAddress(ACL); // F:[AP-3]
    }

    /// @dev Sets address of ACL contract
    /// @param _address Address of ACL contract
    function setACL(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(ACL, _address); // F:[AP-3]
    }

    /// @return Address of ContractsRegister
    function getContractsRegister() external view returns (address) {
        return _getAddress(CONTRACTS_REGISTER); // F:[AP-4]
    }

    /// @dev Sets address of ContractsRegister
    /// @param _address Address of ContractsRegister
    function setContractsRegister(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(CONTRACTS_REGISTER, _address); // F:[AP-4]
    }

    /// @return Address of PriceOracle
    function getPriceOracle() external view override returns (address) {
        return _getAddress(PRICE_ORACLE); // F:[AP-5]
    }

    /// @dev Sets address of PriceOracle
    /// @param _address Address of PriceOracle
    function setPriceOracle(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(PRICE_ORACLE, _address); // F:[AP-5]
    }

    /// @return Address of AccountFactory
    function getAccountFactory() external view returns (address) {
        return _getAddress(ACCOUNT_FACTORY); // F:[AP-6]
    }

    /// @dev Sets address of AccountFactory
    /// @param _address Address of AccountFactory
    function setAccountFactory(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(ACCOUNT_FACTORY, _address); // F:[AP-6]
    }

    /// @return Address of DataCompressor
    function getDataCompressor() external view override returns (address) {
        return _getAddress(DATA_COMPRESSOR); // F:[AP-7]
    }

    /// @dev Sets address of AccountFactory
    /// @param _address Address of AccountFactory
    function setDataCompressor(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(DATA_COMPRESSOR, _address); // F:[AP-7]
    }

    /// @return Address of Treasury contract
    function getTreasuryContract() external view returns (address) {
        return _getAddress(TREASURY_CONTRACT); // F:[AP-8]
    }

    /// @dev Sets address of Treasury Contract
    /// @param _address Address of Treasury Contract
    function setTreasuryContract(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(TREASURY_CONTRACT, _address); // F:[AP-8]
    }

    /// @return Address of GEAR token
    function getGearToken() external view override returns (address) {
        return _getAddress(GEAR_TOKEN); // F:[AP-9]
    }

    /// @dev Sets address of GEAR token
    /// @param _address Address of GEAR token
    function setGearToken(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(GEAR_TOKEN, _address); // F:[AP-9]
    }

    /// @return Address of WETH token
    function getWethToken() external view override returns (address) {
        return _getAddress(WETH_TOKEN); // F:[AP-10]
    }

    /// @dev Sets address of WETH token
    /// @param _address Address of WETH token
    function setWethToken(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(WETH_TOKEN, _address); // F:[AP-10]
    }

    /// @return Address of WETH token
    function getWETHGateway() external view override returns (address) {
        return _getAddress(WETH_GATEWAY); // F:[AP-11]
    }

    /// @dev Sets address of WETH token
    /// @param _address Address of WETH token
    function setWETHGateway(address _address)
        external
        onlyOwner // F:[AP-12]
    {
        _setAddress(WETH_GATEWAY, _address); // F:[AP-11]
    }

    /// @return Address of PathFinder
    function getLeveragedActions() external view returns (address) {
        return _getAddress(LEVERAGED_ACTIONS); // T:[AP-7]
    }

    /// @dev Sets address of  PathFinder
    /// @param _address Address of  PathFinder
    function setLeveragedActions(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(LEVERAGED_ACTIONS, _address); // T:[AP-7]
    }

    /// @return Address of key, reverts if the key doesn't exist
    function _getAddress(bytes32 key) internal view returns (address) {
        address result = addresses[key];
        require(result != address(0), Errors.AS_ADDRESS_NOT_FOUND); // F:[AP-1]
        return result; // F:[AP-3, 4, 5, 6, 7, 8, 9, 10, 11]
    }

    /// @dev Sets address to map by its key
    /// @param key Key in string format
    /// @param value Address
    function _setAddress(bytes32 key, address value) internal {
        addresses[key] = value; // F:[AP-3, 4, 5, 6, 7, 8, 9, 10, 11]
        emit AddressSet(key, value); // F:[AP-2]
    }
}

// File: @gearbox-protocol/core-v2/contracts/interfaces/ICreditManagerV2.sol



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

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

enum ClosureAction {
    CLOSE_ACCOUNT,
    LIQUIDATE_ACCOUNT,
    LIQUIDATE_EXPIRED_ACCOUNT,
    LIQUIDATE_PAUSED
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    //
    // GETTERS
    //

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IPoolService.sol



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

interface IPoolServiceEvents {
    /// @dev Emits on new liquidity being added to the pool
    event AddLiquidity(
        address indexed sender,
        address indexed onBehalfOf,
        uint256 amount,
        uint256 referralCode
    );

    /// @dev Emits on liquidity being removed to the pool
    event RemoveLiquidity(
        address indexed sender,
        address indexed to,
        uint256 amount
    );

    /// @dev Emits on a Credit Manager borrowing funds for a Credit Account
    event Borrow(
        address indexed creditManager,
        address indexed creditAccount,
        uint256 amount
    );

    /// @dev Emits on repayment of a Credit Account's debt
    event Repay(
        address indexed creditManager,
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    );

    /// @dev Emits on updating the interest rate model
    event NewInterestRateModel(address indexed newInterestRateModel);

    /// @dev Emits on connecting a new Credit Manager
    event NewCreditManagerConnected(address indexed creditManager);

    /// @dev Emits when a Credit Manager is forbidden to borrow
    event BorrowForbidden(address indexed creditManager);

    /// @dev Emitted when loss is incurred that can't be covered by treasury funds
    event UncoveredLoss(address indexed creditManager, uint256 loss);

    /// @dev Emits when the liquidity limit is changed
    event NewExpectedLiquidityLimit(uint256 newLimit);

    /// @dev Emits when the withdrawal fee is changed
    event NewWithdrawFee(uint256 fee);
}

/// @title Pool Service Interface
/// @notice Implements business logic:
///   - Adding/removing pool liquidity
///   - Managing diesel tokens & diesel rates
///   - Taking/repaying Credit Manager debt
/// More: https://dev.gearbox.fi/developers/pool/abstractpoolservice
interface IPoolService is IPoolServiceEvents, IVersion {
    //
    // LIQUIDITY MANAGEMENT
    //

    /**
     * @dev Adds liquidity to pool
     * - transfers the underlying to the pool
     * - mints Diesel (LP) tokens to onBehalfOf
     * @param amount Amount of tokens to be deposited
     * @param onBehalfOf The address that will receive the dToken
     * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
     *   0 if the action is executed directly by the user, without a facilitator.
     */
    function addLiquidity(
        uint256 amount,
        address onBehalfOf,
        uint256 referralCode
    ) external;

    /**
     * @dev Removes liquidity from pool
     * - burns LP's Diesel (LP) tokens
     * - returns the equivalent amount of underlying to 'to'
     * @param amount Amount of Diesel tokens to burn
     * @param to Address to transfer the underlying to
     */

    function removeLiquidity(uint256 amount, address to)
        external
        returns (uint256);

    /**
     * @dev Lends pool funds to a Credit Account
     * @param borrowedAmount Credit Account's debt principal
     * @param creditAccount Credit Account's address
     */
    function lendCreditAccount(uint256 borrowedAmount, address creditAccount)
        external;

    /**
     * @dev Repays the Credit Account's debt
     * @param borrowedAmount Amount of principal ro repay
     * @param profit The treasury profit from repayment
     * @param loss Amount of underlying that the CA wan't able to repay
     * @notice Assumes that the underlying (including principal + interest + fees)
     *         was already transferred
     */
    function repayCreditAccount(
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    ) external;

    //
    // GETTERS
    //

    /**
     * @dev Returns the total amount of liquidity in the pool, including borrowed and available funds
     */
    function expectedLiquidity() external view returns (uint256);

    /**
     * @dev Returns the limit on total liquidity
     */
    function expectedLiquidityLimit() external view returns (uint256);

    /**
     * @dev Returns the available liquidity, which is expectedLiquidity - totalBorrowed
     */
    function availableLiquidity() external view returns (uint256);

    /**
     * @dev Calculates the current interest index, RAY format
     */
    function calcLinearCumulative_RAY() external view returns (uint256);

    /**
     * @dev Calculates the current borrow rate, RAY format
     */
    function borrowAPY_RAY() external view returns (uint256);

    /**
     * @dev Returns the total borrowed amount (includes principal only)
     */
    function totalBorrowed() external view returns (uint256);

    /**
     * ç
     **/

    function getDieselRate_RAY() external view returns (uint256);

    /**
     * @dev Returns the address of the underlying
     */
    function underlyingToken() external view returns (address);

    /**
     * @dev Returns the address of the diesel token
     */
    function dieselToken() external view returns (address);

    /**
     * @dev Returns the address of a Credit Manager by its id
     */
    function creditManagers(uint256 id) external view returns (address);

    /**
     * @dev Returns the number of known Credit Managers
     */
    function creditManagersCount() external view returns (uint256);

    /**
     * @dev Maps Credit Manager addresses to their status as a borrower.
     *      Returns false if borrowing is not allowed.
     */
    function creditManagersCanBorrow(address id) external view returns (bool);

    /// @dev Converts a quantity of the underlying to Diesel tokens
    function toDiesel(uint256 amount) external view returns (uint256);

    /// @dev Converts a quantity of Diesel tokens to the underlying
    function fromDiesel(uint256 amount) external view returns (uint256);

    /// @dev Returns the withdrawal fee
    function withdrawFee() external view returns (uint256);

    /// @dev Returns the timestamp of the pool's last update
    function _timestampLU() external view returns (uint256);

    /// @dev Returns the interest index at the last pool update
    function _cumulativeIndex_RAY() external view returns (uint256);

    /// @dev Returns the address provider
    function addressProvider() external view returns (AddressProvider);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



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

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/tokens/DieselToken.sol



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

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

/// @dev DieselToken is LP token for Gearbox pools
contract DieselToken is ERC20, IDieselToken {
    uint8 private immutable _decimals;
    address public immutable poolService;

    modifier onlyPoolService() {
        if (msg.sender != poolService) {
            revert PoolServiceOnlyException();
        }
        _;
    }

    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) ERC20(name_, symbol_) {
        _decimals = decimals_;
        poolService = msg.sender;
    }

    function mint(address to, uint256 amount) external onlyPoolService {
        _mint(to, amount);
    }

    function burn(address to, uint256 amount) external onlyPoolService {
        _burn(to, amount);
    }

    function decimals() public view override returns (uint8) {
        return _decimals;
    }
}

// File: @gearbox-protocol/core-v2/contracts/libraries/Errors.sol



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

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

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

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

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

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

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IErrors.sol



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

/// @dev Common contract exceptions

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

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

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

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

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

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

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

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

error TokenIsNotAddedToCreditManagerException(address token);

// File: @gearbox-protocol/core-v2/contracts/interfaces/IACL.sol



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

interface IACLExceptions {
    /// @dev Thrown when attempting to delete an address from a set that is not a pausable admin
    error AddressNotPausableAdminException(address addr);

    /// @dev Thrown when attempting to delete an address from a set that is not a unpausable admin
    error AddressNotUnpausableAdminException(address addr);
}

interface IACLEvents {
    /// @dev Emits when a new admin is added that can pause contracts
    event PausableAdminAdded(address indexed newAdmin);

    /// @dev Emits when a Pausable admin is removed
    event PausableAdminRemoved(address indexed admin);

    /// @dev Emits when a new admin is added that can unpause contracts
    event UnpausableAdminAdded(address indexed newAdmin);

    /// @dev Emits when an Unpausable admin is removed
    event UnpausableAdminRemoved(address indexed admin);
}

/// @title ACL interface
interface IACL is IACLEvents, IACLExceptions, IVersion {
    /// @dev Returns true if the address is a pausable admin and false if not
    /// @param addr Address to check
    function isPausableAdmin(address addr) external view returns (bool);

    /// @dev Returns true if the address is unpausable admin and false if not
    /// @param addr Address to check
    function isUnpausableAdmin(address addr) external view returns (bool);

    /// @dev Returns true if an address has configurator rights
    /// @param account Address to check
    function isConfigurator(address account) external view returns (bool);

    /// @dev Returns address of configurator
    function owner() external view returns (address);
}

// File: @openzeppelin/contracts/security/Pausable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IVersion.sol



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

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

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IAddressProvider.sol



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

interface IAddressProviderEvents {
    /// @dev Emits when an address is set for a contract role
    event AddressSet(bytes32 indexed service, address indexed newAddress);
}

/// @title Optimised for front-end Address Provider interface
interface IAddressProvider is IAddressProviderEvents, IVersion {
    /// @return Address of ACL contract
    function getACL() external view returns (address);

    /// @return Address of ContractsRegister
    function getContractsRegister() external view returns (address);

    /// @return Address of AccountFactory
    function getAccountFactory() external view returns (address);

    /// @return Address of DataCompressor
    function getDataCompressor() external view returns (address);

    /// @return Address of GEAR token
    function getGearToken() external view returns (address);

    /// @return Address of WETH token
    function getWethToken() external view returns (address);

    /// @return Address of WETH Gateway
    function getWETHGateway() external view returns (address);

    /// @return Address of PriceOracle
    function getPriceOracle() external view returns (address);

    /// @return Address of DAO Treasury Multisig
    function getTreasuryContract() external view returns (address);

    /// @return Address of PathFinder
    function getLeveragedActions() external view returns (address);
}

// File: @gearbox-protocol/core-v2/contracts/core/access/Claimable.sol



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

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/// @title Claimable
/// @dev Implements logic for a two-step ownership transfer on top of Ownable
contract Claimable is Ownable {
    /// @dev The new owner that has not claimed ownership yet
    address public pendingOwner;

    /// @dev A modifier that restricts the function to the pending owner only
    modifier onlyPendingOwner() {
        if (msg.sender != pendingOwner) {
            revert("Claimable: Sender is not pending owner");
        }
        _;
    }

    /// @dev Sets pending owner to the new owner, but does not
    /// transfer ownership yet
    /// @param newOwner The address to become the future owner
    function transferOwnership(address newOwner) public override onlyOwner {
        require(
            newOwner != address(0),
            "Claimable: new owner is the zero address"
        );
        pendingOwner = newOwner;
    }

    /// @dev Used by the pending owner to claim ownership after transferOwnership
    function claimOwnership() external onlyPendingOwner {
        _transferOwnership(pendingOwner);
        pendingOwner = address(0);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

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

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IPriceOracle.sol



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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Address.sol



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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



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

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

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

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

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

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

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

        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

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

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @gearbox-protocol/core-v2/contracts/interfaces/IDieselToken.sol



// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IDieselTokenExceptions {
    /// @dev Thrown if an access-restricted function was called by non-PoolService
    error PoolServiceOnlyException();
}

interface IDieselToken is IERC20, IDieselTokenExceptions {
    /// @dev Returns the address of the pool this Diesel token belongs to
    function poolService() external view returns (address);
}