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// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

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

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import {Math} from "@openzeppelin/contracts/math/Math.sol";
import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol";
import {WadRayMath} from "../libraries/math/WadRayMath.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";

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

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

/// @title Pool Service
/// @notice Encapsulates business logic for:
///  - Adding/removing pool liquidity
///  - Managing diesel tokens & diesel rates
///  - Lend funds to credit manager
///
/// #define currentBorrowRate() uint =
///     let expLiq := expectedLiquidity() in
///     let availLiq := availableLiquidity() in
///         interestRateModel.calcBorrowRate(expLiq, availLiq);
///
/// More: https://dev.gearbox.fi/developers/pools/pool-service
contract PoolService is IPoolService, ACLTrait, ReentrancyGuard {
    using SafeMath for uint256;
    using WadRayMath for uint256;
    using SafeERC20 for IERC20;
    using PercentageMath for uint256;

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

    // Expected liquidity limit
    uint256 public override expectedLiquidityLimit;

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

    // Address repository
    AddressProvider public addressProvider;

    // Interest rate model
    IInterestRateModel public interestRateModel;

    // Underlying token address
    address public override underlyingToken;

    // Diesel(LP) token address
    address public override dieselToken;

    // Credit managers mapping with permission to borrow / repay
    mapping(address => bool) public override creditManagersCanBorrow;
    mapping(address => bool) public creditManagersCanRepay;

    // Credif managers
    address[] public override creditManagers;

    // Treasury address for tokens
    address public treasuryAddress;

    // Cumulative index in RAY
    uint256 public override _cumulativeIndex_RAY;

    // Current borrow rate in RAY: https://dev.gearbox.fi/developers/pools/economy#borrow-apy
    uint256 public override borrowAPY_RAY;

    // Timestamp of last update
    uint256 public override _timestampLU;

    // Withdraw fee in PERCENTAGE FORMAT
    uint256 public override withdrawFee;

    // Contract version
    uint256 public constant version = 1;

    //
    // CONSTRUCTOR
    //

    /// @dev Constructor
    /// @param _addressProvider Address Repository for upgradable contract model
    /// @param _underlyingToken Address of underlying token
    /// @param _dieselAddress Address of diesel (LP) token
    /// @param _interestRateModelAddress Address of interest rate model
    constructor(
        address _addressProvider,
        address _underlyingToken,
        address _dieselAddress,
        address _interestRateModelAddress,
        uint256 _expectedLiquidityLimit
    ) ACLTrait(_addressProvider) {
        require(
            _addressProvider != address(0) &&
                _underlyingToken != address(0) &&
                _dieselAddress != address(0) &&
                _interestRateModelAddress != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        );

        addressProvider = AddressProvider(_addressProvider);

        underlyingToken = _underlyingToken;
        dieselToken = _dieselAddress;
        treasuryAddress = addressProvider.getTreasuryContract();

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

    //
    // LIQUIDITY MANAGEMENT
    //

    /**
     * @dev Adds liquidity to pool
     * - Transfers underlying asset to pool
     * - Mints diesel (LP) token with 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 transfer
     * @param onBehalfOf The address that will receive the diesel tokens, same as msg.sender if the user
     *   wants to receive them on his own wallet, or a different address if the beneficiary of diesel
     * tokens is a different wallet
     * @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 any middle-man
     *
     * #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().add(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)).sub(
            balanceBefore
        ); // T:[FT-1]

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

        _expectedLiquidityLU = _expectedLiquidityLU.add(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 LP underlying account = amount * diesel rate
     * - Burns diesel tokens
     * - Decreases underlying amount from total_liquidity
     * - Updates borrow rate
     *
     * More: https://dev.gearbox.fi/developers/pools/pool-service#removeliquidity
     *
     * @param amount Amount of tokens to be transfer
     * @param to Address to transfer liquidity
     *
     * #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.sub(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.sub(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 should be in the pool
    /// if all users close their Credit accounts and return debt
    ///
    /// 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.sub(uint256(_timestampLU));

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

        return _expectedLiquidityLU.add(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 credit manager and updates the pool parameters
    /// More: https://dev.gearbox.fi/developers/pools/pool-service#lendcreditAccount
    ///
    /// @param borrowedAmount Borrowed amount for credit account
    /// @param creditAccount Credit account 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.add(borrowedAmount); // T:[PS-16]

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

    /// @dev It's called after credit account funds transfer back to pool and updates corretly parameters.
    /// More: https://dev.gearbox.fi/developers/pools/pool-service#repaycreditAccount
    ///
    /// @param borrowedAmount Borrowed amount (without interest accrued)
    /// @param profit Represents PnL value if PnL > 0
    /// @param loss Represents PnL value if PnL <0
    ///
    /// #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.add(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.sub(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 = totalBorrowed.sub(borrowedAmount); // T:[PS-19, 20]

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

    //
    // INTEREST RATE MANAGEMENT
    //

    /**
     * @dev Calculates interest accrued from the last update using the linear model
     *
     *                                    /     currentBorrowRate * timeDifference \
     *  newCumIndex  = currentCumIndex * | 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.sub(uint256(_timestampLU)); // T:[PS-28]

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

    /// @dev Calculate linear index
    /// @param cumulativeIndex_RAY Current cumulative index in RAY
    /// @param currentBorrowRate_RAY Current borrow rate in RAY
    /// @param timeDifference Duration in seconds
    /// @return newCumulativeIndex Cumulative index accrued duration in Rays
    function calcLinearIndex_RAY(
        uint256 cumulativeIndex_RAY,
        uint256 currentBorrowRate_RAY,
        uint256 timeDifference
    ) public pure returns (uint256) {
        //                                    /     currentBorrowRate * timeDifference \
        //  newCumIndex  = currentCumIndex * | 1 + ------------------------------------ |
        //                                    \              SECONDS_PER_YEAR          /
        //
        uint256 linearAccumulated_RAY = WadRayMath.RAY.add(
            currentBorrowRate_RAY.mul(timeDifference).div(
                Constants.SECONDS_PER_YEAR
            )
        ); // T:[GM-2]

        return cumulativeIndex_RAY.rayMul(linearAccumulated_RAY); // T:[GM-2]
    }

    /// @dev Updates Cumulative index when liquidity parameters are changed
    ///  - compute how much interest were accrued from last update
    ///  - compute new cumulative index based on updated liquidity parameters
    ///  - stores new cumulative index and timestamp when it was updated
    function _updateBorrowRate(uint256 loss) internal {
        // Update total _expectedLiquidityLU

        _expectedLiquidityLU = expectedLiquidity().sub(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 current diesel rate in RAY format
    /// 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 WadRayMath.RAY; // T:[PS-1]
        return expectedLiquidity().mul(Constants.RAY).div(dieselSupply); // T:[PS-6]
    }

    /// @dev Converts amount into diesel tokens
    /// @param amount Amount in underlying tokens to be converted to diesel tokens
    function toDiesel(uint256 amount) public view override returns (uint256) {
        return amount.mul(Constants.RAY).div(getDieselRate_RAY()); // T:[PS-24]
    }

    /// @dev Converts amount from diesel tokens to undelying token
    /// @param amount Amount in diesel tokens to be converted to diesel tokens
    function fromDiesel(uint256 amount) public view override returns (uint256) {
        return amount.mul(getDieselRate_RAY()).div(Constants.RAY); // T:[PS-24]
    }

    //
    // CONFIGURATION
    //

    /// @dev Connects new Credif manager to pool
    /// @param _creditManager Address of credif manager
    function connectCreditManager(address _creditManager)
        external
        configuratorOnly // T:[PS-9]
    {
        require(
            address(this) == ICreditManager(_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 Forbid to borrow for particulat credif manager
    /// @param _creditManager Address of credif 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 pool
    /// @param _interestRateModel Address of 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);
    }

    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 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 withdraw fee
    function setWithdrawFee(uint256 fee)
        public
        configuratorOnly // T:[PS-9]
    {
        require(
            fee <= Constants.MAX_WITHDRAW_FEE,
            Errors.POOL_INCORRECT_WITHDRAW_FEE
        ); // T:[PS-32]
        withdrawFee = fee; // T:[PS-33]
        emit NewWithdrawFee(fee); // T:[PS-33]
    }

    /// @dev Returns quantity of connected credit accounts managers
    function creditManagersCount() external view override returns (uint256) {
        return creditManagers.length; // T:[PS-11]
    }

    function calcCumulativeIndexAtBorrowMore(
        uint256 amount,
        uint256 dAmount,
        uint256 cumulativeIndexAtOpen
    ) external view override returns (uint256) {
        return
            calcLinearCumulative_RAY()
                .mul(cumulativeIndexAtOpen)
                .mul(amount.add(dAmount))
                .div(
                calcLinearCumulative_RAY().mul(amount).add(
                    dAmount.mul(cumulativeIndexAtOpen)
                )
            );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        _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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";
import {AddressProvider} from "./AddressProvider.sol";
import {ACL} from "./ACL.sol";
import {Errors} from "../libraries/helpers/Errors.sol";


/// @title ACL Trait
/// @notice Trait which adds acl functions to contract
abstract contract ACLTrait is Pausable {
    // ACL contract to check rights
    ACL private _acl;

    /// @dev constructor
    /// @param addressProvider Address of address repository
    constructor(address addressProvider) {
        require(
            addressProvider != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        );

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

    /// @dev  Reverts if msg.sender is not configurator
    modifier configuratorOnly() {
        require(
            _acl.isConfigurator(msg.sender),
            Errors.ACL_CALLER_NOT_CONFIGURATOR
        ); // T:[ACLT-8]
        _;
    }

    ///@dev Pause contract
    function pause() external {
        require(
            _acl.isPausableAdmin(msg.sender),
            Errors.ACL_CALLER_NOT_PAUSABLE_ADMIN
        ); // T:[ACLT-1]
        _pause();
    }

    /// @dev Unpause contract
    function unpause() external {
        require(
            _acl.isUnpausableAdmin(msg.sender),
            Errors.ACL_CALLER_NOT_PAUSABLE_ADMIN
        ); // T:[ACLT-1],[ACLT-2]
        _unpause();
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.7.4;


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

/**
 * @title WadRayMath library
 * @author Aave
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 * More info https://github.com/aave/aave-protocol/blob/master/contracts/libraries/WadRayMath.sol
 */

library WadRayMath {
    uint256 internal constant WAD = 1e18;
    uint256 internal constant halfWAD = WAD / 2;

    uint256 internal constant RAY = 1e27;
    uint256 internal constant halfRAY = RAY / 2;

    uint256 internal constant WAD_RAY_RATIO = 1e9;

    /**
     * @return One ray, 1e27
     */
    function ray() internal pure returns (uint256) {
        return RAY; // T:[WRM-1]
    }

    /**
     * @return One wad, 1e18
     */

    function wad() internal pure returns (uint256) {
        return WAD; // T:[WRM-1]
    }

    /**
     * @return Half ray, 1e27/2
     */
    function halfRay() internal pure returns (uint256) {
        return halfRAY; // T:[WRM-2]
    }

    /**
     * @return Half ray, 1e18/2
     */
    function halfWad() internal pure returns (uint256) {
        return halfWAD; // T:[WRM-2]
    }

    /**
     * @dev Multiplies two wad, rounding half up to the nearest wad
     * @param a Wad
     * @param b Wad
     * @return The result of a*b, in wad
     */
    function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0; // T:[WRM-3]
        }

        require(
            a <= (type(uint256).max - halfWAD) / b,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        ); // T:[WRM-3]

        return (a * b + halfWAD) / WAD; // T:[WRM-3]
    }

    /**
     * @dev Divides two wad, rounding half up to the nearest wad
     * @param a Wad
     * @param b Wad
     * @return The result of a/b, in wad
     */
    function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO); // T:[WRM-4]
        uint256 halfB = b / 2;

        require(
            a <= (type(uint256).max - halfB) / WAD,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        ); // T:[WRM-4]

        return (a * WAD + halfB) / b; // T:[WRM-4]
    }

    /**
     * @dev Multiplies two ray, rounding half up to the nearest ray
     * @param a Ray
     * @param b Ray
     * @return The result of a*b, in ray
     */
    function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0 || b == 0) {
            return 0; // T:[WRM-5]
        }

        require(
            a <= (type(uint256).max - halfRAY) / b,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        ); // T:[WRM-5]

        return (a * b + halfRAY) / RAY; // T:[WRM-5]
    }

    /**
     * @dev Divides two ray, rounding half up to the nearest ray
     * @param a Ray
     * @param b Ray
     * @return The result of a/b, in ray
     */
    function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, Errors.MATH_DIVISION_BY_ZERO); // T:[WRM-6]
        uint256 halfB = b / 2; // T:[WRM-6]

        require(
            a <= (type(uint256).max - halfB) / RAY,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        ); // T:[WRM-6]

        return (a * RAY + halfB) / b; // T:[WRM-6]
    }

    /**
     * @dev Casts ray down to wad
     * @param a Ray
     * @return a casted to wad, rounded half up to the nearest wad
     */
    function rayToWad(uint256 a) internal pure returns (uint256) {
        uint256 halfRatio = WAD_RAY_RATIO / 2; // T:[WRM-7]
        uint256 result = halfRatio + a; // T:[WRM-7]
        require(result >= halfRatio, Errors.MATH_ADDITION_OVERFLOW); // T:[WRM-7]

        return result / WAD_RAY_RATIO; // T:[WRM-7]
    }

    /**
     * @dev Converts wad up to ray
     * @param a Wad
     * @return a converted in ray
     */
    function wadToRay(uint256 a) internal pure returns (uint256) {
        uint256 result = a * WAD_RAY_RATIO; // T:[WRM-8]
        require(
            result / WAD_RAY_RATIO == a,
            Errors.MATH_MULTIPLICATION_OVERFLOW
        ); // T:[WRM-8]
        return result; // T:[WRM-8]
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.7.4;

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

/**
 * @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 {
    uint256 constant PERCENTAGE_FACTOR = 1e4; //percentage plus two decimals
    uint256 constant HALF_PERCENT = PERCENTAGE_FACTOR / 2;

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

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

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

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

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

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

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;


/// @title IInterestRateModel interface
/// @dev Interface for the calculation of the interest rates
interface IInterestRateModel {

    /// @dev Calculated borrow rate based on expectedLiquidity and availableLiquidity
    /// @param expectedLiquidity Expected liquidity in the pool
    /// @param availableLiquidity Available liquidity in the pool
    function calcBorrowRate(uint256 expectedLiquidity, uint256 availableLiquidity)
        external
        view
        returns (uint256);
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;
import {IAppPoolService} from "./app/IAppPoolService.sol";


/// @title Pool Service Interface
/// @notice Implements business logic:
///   - Adding/removing pool liquidity
///   - Managing diesel tokens & diesel rates
///   - Lending/repaying funds to credit Manager
/// More: https://dev.gearbox.fi/developers/pool/abstractpoolservice
interface IPoolService is IAppPoolService {
    // Emits each time when LP adds liquidity to the pool
    event AddLiquidity(
        address indexed sender,
        address indexed onBehalfOf,
        uint256 amount,
        uint256 referralCode
    );

    // Emits each time when LP removes liquidity to the pool
    event RemoveLiquidity(
        address indexed sender,
        address indexed to,
        uint256 amount
    );

    // Emits each time when Credit Manager borrows money from pool
    event Borrow(
        address indexed creditManager,
        address indexed creditAccount,
        uint256 amount
    );

    // Emits each time when Credit Manager repays money from pool
    event Repay(
        address indexed creditManager,
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    );

    // Emits each time when Interest Rate model was changed
    event NewInterestRateModel(address indexed newInterestRateModel);

    // Emits each time when new credit Manager was connected
    event NewCreditManagerConnected(address indexed creditManager);

    // Emits each time when borrow forbidden for credit manager
    event BorrowForbidden(address indexed creditManager);

    // Emits each time when uncovered (non insured) loss accrued
    event UncoveredLoss(address indexed creditManager, uint256 loss);

    // Emits after expected liquidity limit update
    event NewExpectedLiquidityLimit(uint256 newLimit);

    // Emits each time when withdraw fee is udpated
    event NewWithdrawFee(uint256 fee);

    //
    // LIQUIDITY MANAGEMENT
    //

    /**
     * @dev Adds liquidity to pool
     * - transfers lp tokens to pool
     * - mint diesel (LP) tokens and provide them
     * @param amount Amount of tokens to be transfer
     * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
     *   wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
     *   is a different wallet
     * @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 any middle-man
     */
    function addLiquidity(
        uint256 amount,
        address onBehalfOf,
        uint256 referralCode
    ) external override;

    /**
     * @dev Removes liquidity from pool
     * - burns lp's diesel (LP) tokens
     * - returns underlying tokens to lp
     * @param amount Amount of tokens to be transfer
     * @param to Address to transfer liquidity
     */

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

    /**
     * @dev Transfers money from the pool to credit account
     * and updates the pool parameters
     * @param borrowedAmount Borrowed amount for credit account
     * @param creditAccount Credit account address
     */
    function lendCreditAccount(uint256 borrowedAmount, address creditAccount)
        external;

    /**
     * @dev Recalculates total borrowed & borrowRate
     * mints/burns diesel tokens
     */
    function repayCreditAccount(
        uint256 borrowedAmount,
        uint256 profit,
        uint256 loss
    ) external;

    //
    // GETTERS
    //

    /**
     * @return expected pool liquidity
     */
    function expectedLiquidity() external view returns (uint256);

    /**
     * @return expected liquidity limit
     */
    function expectedLiquidityLimit() external view returns (uint256);

    /**
     * @dev Gets available liquidity in the pool (pool balance)
     * @return available pool liquidity
     */
    function availableLiquidity() external view returns (uint256);

    /**
     * @dev Calculates interest accrued from the last update using the linear model
     */
    function calcLinearCumulative_RAY() external view returns (uint256);

    /**
     * @dev Calculates borrow rate
     * @return borrow rate in RAY format
     */
    function borrowAPY_RAY() external view returns (uint256);

    /**
     * @dev Gets the amount of total borrowed funds
     * @return Amount of borrowed funds at current time
     */
    function totalBorrowed() external view returns (uint256);

    /**
     * @return Current diesel rate
     **/

    function getDieselRate_RAY() external view returns (uint256);

    /**
     * @dev Underlying token address getter
     * @return address of underlying ERC-20 token
     */
    function underlyingToken() external view returns (address);

    /**
     * @dev Diesel(LP) token address getter
     * @return address of diesel(LP) ERC-20 token
     */
    function dieselToken() external view returns (address);

    /**
     * @dev Credit Manager address getter
     * @return address of Credit Manager contract by id
     */
    function creditManagers(uint256 id) external view returns (address);

    /**
     * @dev Credit Managers quantity
     * @return quantity of connected credit Managers
     */
    function creditManagersCount() external view returns (uint256);

    function creditManagersCanBorrow(address id) external view returns (bool);

    function toDiesel(uint256 amount) external view returns (uint256);

    function fromDiesel(uint256 amount) external view returns (uint256);

    function withdrawFee() external view returns (uint256);

    function _timestampLU() external view returns (uint256);

    function _cumulativeIndex_RAY() external view returns (uint256);

    function calcCumulativeIndexAtBorrowMore(
        uint256 amount,
        uint256 dAmount,
        uint256 cumulativeIndexAtOpen
    ) external view returns (uint256);

}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

interface ICreditFilter {
    // Emits each time token is allowed or liquidtion threshold changed
    event TokenAllowed(address indexed token, uint256 liquidityThreshold);

   // Emits each time token is allowed or liquidtion threshold changed
    event TokenForbidden(address indexed token);

    // Emits each time contract is allowed or adapter changed
    event ContractAllowed(address indexed protocol, address indexed adapter);

    // Emits each time contract is forbidden
    event ContractForbidden(address indexed protocol);

    // Emits each time when fast check parameters are updated
    event NewFastCheckParameters(uint256 chiThreshold, uint256 fastCheckDelay);

    event TransferAccountAllowed(
        address indexed from,
        address indexed to,
        bool state
    );

    event TransferPluginAllowed(
        address indexed pugin,
        bool state
    );

    event PriceOracleUpdated(address indexed newPriceOracle);

    //
    // STATE-CHANGING FUNCTIONS
    //

    /// @dev Adds token to the list of allowed tokens
    /// @param token Address of allowed token
    /// @param liquidationThreshold The constant showing the maximum allowable ratio of Loan-To-Value for the i-th asset.
    function allowToken(address token, uint256 liquidationThreshold) external;

    /// @dev Adds contract to the list of allowed contracts
    /// @param targetContract Address of contract to be allowed
    /// @param adapter Adapter contract address
    function allowContract(address targetContract, address adapter) external;

    /// @dev Forbids contract and removes it from the list of allowed contracts
    /// @param targetContract Address of allowed contract
    function forbidContract(address targetContract) external;

    /// @dev Checks financial order and reverts if tokens aren't in list or collateral protection alerts
    /// @param creditAccount Address of credit account
    /// @param tokenIn Address of token In in swap operation
    /// @param tokenOut Address of token Out in swap operation
    /// @param amountIn Amount of tokens in
    /// @param amountOut Amount of tokens out
    function checkCollateralChange(
        address creditAccount,
        address tokenIn,
        address tokenOut,
        uint256 amountIn,
        uint256 amountOut
    ) external;

    function checkMultiTokenCollateral(
        address creditAccount,
        uint256[] memory amountIn,
        uint256[] memory amountOut,
        address[] memory tokenIn,
        address[] memory tokenOut
    ) external;

    /// @dev Connects credit managaer, hecks that all needed price feeds exists and finalize config
    function connectCreditManager(address poolService) external;

    /// @dev Sets collateral protection for new credit accounts
    function initEnabledTokens(address creditAccount) external;

    function checkAndEnableToken(address creditAccount, address token) external;

    //
    // GETTERS
    //

    /// @dev Returns quantity of contracts in allowed list
    function allowedContractsCount() external view returns (uint256);

    /// @dev Returns of contract address from the allowed list by its id
    function allowedContracts(uint256 id) external view returns (address);

    /// @dev Reverts if token isn't in token allowed list
    function revertIfTokenNotAllowed(address token) external view;

    /// @dev Returns true if token is in allowed list otherwise false
    function isTokenAllowed(address token) external view returns (bool);

    /// @dev Returns quantity of tokens in allowed list
    function allowedTokensCount() external view returns (uint256);

    /// @dev Returns of token address from allowed list by its id
    function allowedTokens(uint256 id) external view returns (address);

    /// @dev Calculates total value for provided address
    /// More: https://dev.gearbox.fi/developers/credit/economy#total-value
    ///
    /// @param creditAccount Token creditAccount address
    function calcTotalValue(address creditAccount)
        external
        view
        returns (uint256 total);

    /// @dev Calculates Threshold Weighted Total Value
    /// More: https://dev.gearbox.fi/developers/credit/economy#threshold-weighted-value
    ///
    ///@param creditAccount Credit account address
    function calcThresholdWeightedValue(address creditAccount)
        external
        view
        returns (uint256 total);

    function contractToAdapter(address allowedContract)
        external
        view
        returns (address);

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

    /// @dev Returns address & balance of token by the id of allowed token in the list
    /// @param creditAccount Credit account address
    /// @param id Id of token in allowed list
    /// @return token Address of token
    /// @return balance Token balance
    function getCreditAccountTokenById(address creditAccount, uint256 id)
        external
        view
        returns (
            address token,
            uint256 balance,
            uint256 tv,
            uint256 twv
        );

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

    /// @dev Calculates credit account interest accrued
    /// More: https://dev.gearbox.fi/developers/credit/economy#interest-rate-accrued
    ///
    /// @param creditAccount Credit account address
    function calcCreditAccountAccruedInterest(address creditAccount)
        external
        view
        returns (uint256);

    /// @dev Return enabled tokens - token masks where each bit is "1" is token is enabled
    function enabledTokens(address creditAccount)
        external
        view
        returns (uint256);

    function liquidationThresholds(address token)
        external
        view
        returns (uint256);

    function priceOracle() external view returns (address);

    function updateUnderlyingTokenLiquidationThreshold() external;

    function revertIfCantIncreaseBorrowing(
        address creditAccount,
        uint256 minHealthFactor
    ) external view;

    function revertIfAccountTransferIsNotAllowed(
        address onwer,
        address creditAccount
    ) external view;

    function approveAccountTransfers(address from, bool state) external;

    function allowanceForAccountTransfers(address from, address to)
        external
        view
        returns (bool);
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;
pragma abicoder v2;

import {ICreditFilter} from "../interfaces/ICreditFilter.sol";
import {IAppCreditManager} from "./app/IAppCreditManager.sol";
import {DataTypes} from "../libraries/data/Types.sol";


/// @title Credit Manager interface
/// @notice It encapsulates business logic for managing credit accounts
///
/// More info: https://dev.gearbox.fi/developers/credit/credit_manager
interface ICreditManager is IAppCreditManager {
    // Emits each time when the credit account is opened
    event OpenCreditAccount(
        address indexed sender,
        address indexed onBehalfOf,
        address indexed creditAccount,
        uint256 amount,
        uint256 borrowAmount,
        uint256 referralCode
    );

    // Emits each time when the credit account is closed
    event CloseCreditAccount(
        address indexed owner,
        address indexed to,
        uint256 remainingFunds
    );

    // Emits each time when the credit account is liquidated
    event LiquidateCreditAccount(
        address indexed owner,
        address indexed liquidator,
        uint256 remainingFunds
    );

    // Emits each time when borrower increases borrowed amount
    event IncreaseBorrowedAmount(address indexed borrower, uint256 amount);

    // Emits each time when borrower adds collateral
    event AddCollateral(
        address indexed onBehalfOf,
        address indexed token,
        uint256 value
    );

    // Emits each time when the credit account is repaid
    event RepayCreditAccount(address indexed owner, address indexed to);

    // Emit each time when financial order is executed
    event ExecuteOrder(address indexed borrower, address indexed target);

    // Emits each time when new fees are set
    event NewParameters(
        uint256 minAmount,
        uint256 maxAmount,
        uint256 maxLeverage,
        uint256 feeInterest,
        uint256 feeLiquidation,
        uint256 liquidationDiscount
    );

    event TransferAccount(address indexed oldOwner, address indexed newOwner);

    //
    // CREDIT ACCOUNT MANAGEMENT
    //

    /**
     * @dev Opens credit account and provides credit funds.
     * - Opens credit account (take it from account factory)
     * - Transfers trader /farmers initial funds to credit account
     * - Transfers borrowed leveraged amount from pool (= amount x leverageFactor) calling lendCreditAccount() on connected Pool contract.
     * - Emits OpenCreditAccount event
     * Function reverts if user has already opened position
     *
     * More info: https://dev.gearbox.fi/developers/credit/credit_manager#open-credit-account
     *
     * @param amount Borrowers own funds
     * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
     *   wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
     *   is a different wallet
     * @param leverageFactor Multiplier to borrowers own funds
     * @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 any middle-man
     */
    function openCreditAccount(
        uint256 amount,
        address onBehalfOf,
        uint256 leverageFactor,
        uint256 referralCode
    ) external override;

    /**
     * @dev Closes credit account
     * - Swaps all assets to underlying one using default swap protocol
     * - Pays borrowed amount + interest accrued + fees back to the pool by calling repayCreditAccount
     * - Transfers remaining funds to the trader / farmer
     * - Closes the credit account and return it to account factory
     * - Emits CloseCreditAccount event
     *
     * More info: https://dev.gearbox.fi/developers/credit/credit_manager#close-credit-account
     *
     * @param to Address to send remaining funds
     * @param paths Exchange type data which provides paths + amountMinOut
     */
    function closeCreditAccount(address to, DataTypes.Exchange[] calldata paths)
        external
        override;

    /**
     * @dev Liquidates credit account
     * - Transfers discounted total credit account value from liquidators account
     * - Pays borrowed funds + interest + fees back to pool, than transfers remaining funds to credit account owner
     * - Transfer all assets from credit account to liquidator ("to") account
     * - Returns credit account to factory
     * - Emits LiquidateCreditAccount event
     *
     * More info: https://dev.gearbox.fi/developers/credit/credit_manager#liquidate-credit-account
     *
     * @param borrower Borrower address
     * @param to Address to transfer all assets from credit account
     * @param force If true, use transfer function for transferring tokens instead of safeTransfer
     */
    function liquidateCreditAccount(
        address borrower,
        address to,
        bool force
    ) external;

    /// @dev Repays credit account
    /// More info: https://dev.gearbox.fi/developers/credit/credit_manager#repay-credit-account
    ///
    /// @param to Address to send credit account assets
    function repayCreditAccount(address to) external override;

    /// @dev Repays credit account with ETH. Restricted to be called by WETH Gateway only
    ///
    /// @param borrower Address of borrower
    /// @param to Address to send credit account assets
    function repayCreditAccountETH(address borrower, address to)
        external
        returns (uint256);

    /// @dev Increases borrowed amount by transferring additional funds from
    /// the pool if after that HealthFactor > minHealth
    /// More info: https://dev.gearbox.fi/developers/credit/credit_manager#increase-borrowed-amount
    ///
    /// @param amount Amount to increase borrowed amount
    function increaseBorrowedAmount(uint256 amount) external override;

    /// @dev Adds collateral to borrower's credit account
    /// @param onBehalfOf Address of borrower to add funds
    /// @param token Token address
    /// @param amount Amount to add
    function addCollateral(
        address onBehalfOf,
        address token,
        uint256 amount
    ) external override;

    /// @dev Returns true if the borrower has opened a credit account
    /// @param borrower Borrower account
    function hasOpenedCreditAccount(address borrower)
        external
        view
        override
        returns (bool);

    /// @dev Calculates Repay amount = borrow amount + interest accrued + fee
    ///
    /// More info: https://dev.gearbox.fi/developers/credit/economy#repay
    ///           https://dev.gearbox.fi/developers/credit/economy#liquidate
    ///
    /// @param borrower Borrower address
    /// @param isLiquidated True if calculated repay amount for liquidator
    function calcRepayAmount(address borrower, bool isLiquidated)
        external
        view
        override
        returns (uint256);

    /// @dev Returns minimal amount for open credit account
    function minAmount() external view returns (uint256);

    /// @dev Returns maximum amount for open credit account
    function maxAmount() external view returns (uint256);

    /// @dev Returns maximum leveraged factor allowed for this pool
    function maxLeverageFactor() external view returns (uint256);

    /// @dev Returns underlying token address
    function underlyingToken() external view returns (address);

    /// @dev Returns address of connected pool
    function poolService() external view returns (address);

    /// @dev Returns address of CreditFilter
    function creditFilter() external view returns (ICreditFilter);

    /// @dev Returns address of CreditFilter
    function creditAccounts(address borrower) external view returns (address);

    /// @dev Executes filtered order on credit account which is connected with particular borrowers
    /// @param borrower Borrower address
    /// @param target Target smart-contract
    /// @param data Call data for call
    function executeOrder(
        address borrower,
        address target,
        bytes memory data
    ) external returns (bytes memory);

    /// @dev Approves token for msg.sender's credit account
    function approve(address targetContract, address token) external;

    /// @dev Approve tokens for credit accounts. Restricted for adapters only
    function provideCreditAccountAllowance(
        address creditAccount,
        address toContract,
        address token
    ) external;

    function transferAccountOwnership(address newOwner) external;

    /// @dev Returns address of borrower's credit account and reverts of borrower has no one.
    /// @param borrower Borrower address
    function getCreditAccountOrRevert(address borrower)
        external
        view
        override
        returns (address);

//    function feeSuccess() external view returns (uint256);

    function feeInterest() external view returns (uint256);

    function feeLiquidation() external view returns (uint256);

    function liquidationDiscount() external view returns (uint256);

    function minHealthFactor() external view returns (uint256);

    function defaultSwapContract() external view override returns (address);
}

// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

import {IAppAddressProvider} from "../interfaces/app/IAppAddressProvider.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Errors} from "../libraries/helpers/Errors.sol";


/// @title AddressRepository
/// @notice Stores addresses of deployed contracts
contract AddressProvider is Ownable, IAppAddressProvider {
    // Mapping which keeps all addresses
    mapping(bytes32 => address) public addresses;

    // Emits each time when new address is set
    event AddressSet(bytes32 indexed service, address indexed newAddress);

    // This event is triggered when a call to ClaimTokens succeeds.
    event Claimed(uint256 user_id, address account, uint256 amount, bytes32 leaf);

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

    // Contract version
    uint256 public constant version = 1;

    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); // T:[AP-3]
    }

    /// @dev Sets address of ACL contract
    /// @param _address Address of ACL contract
    function setACL(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(ACL, _address); // T:[AP-3]
    }

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

    /// @dev Sets address of ContractsRegister
    /// @param _address Address of ContractsRegister
    function setContractsRegister(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(CONTRACTS_REGISTER, _address); // T:[AP-4]
    }

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

    /// @dev Sets address of PriceOracle
    /// @param _address Address of PriceOracle
    function setPriceOracle(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(PRICE_ORACLE, _address); // T:[AP-5]
    }

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

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

    /// @return Address of AccountFactory
    function getDataCompressor() external view override returns (address) {
        return _getAddress(DATA_COMPRESSOR); // T:[AP-8]
    }

    /// @dev Sets address of AccountFactory
    /// @param _address Address of AccountFactory
    function setDataCompressor(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(DATA_COMPRESSOR, _address); // T:[AP-8]
    }

    /// @return Address of Treasury contract
    function getTreasuryContract() external view returns (address) {
        return _getAddress(TREASURY_CONTRACT); //T:[AP-11]
    }

    /// @dev Sets address of Treasury Contract
    /// @param _address Address of Treasury Contract
    function setTreasuryContract(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(TREASURY_CONTRACT, _address); //T:[AP-11]
    }

    /// @return Address of GEAR token
    function getGearToken() external view override returns (address) {
        return _getAddress(GEAR_TOKEN); // T:[AP-12]
    }

    /// @dev Sets address of GEAR token
    /// @param _address Address of GEAR token
    function setGearToken(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(GEAR_TOKEN, _address); // T:[AP-12]
    }

    /// @return Address of WETH token
    function getWethToken() external view override returns (address) {
        return _getAddress(WETH_TOKEN); // T:[AP-13]
    }

    /// @dev Sets address of WETH token
    /// @param _address Address of WETH token
    function setWethToken(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(WETH_TOKEN, _address); // T:[AP-13]
    }

    /// @return Address of WETH token
    function getWETHGateway() external view override returns (address) {
        return _getAddress(WETH_GATEWAY); // T:[AP-14]
    }

    /// @dev Sets address of WETH token
    /// @param _address Address of WETH token
    function setWETHGateway(address _address)
        external
        onlyOwner // T:[AP-15]
    {
        _setAddress(WETH_GATEWAY, _address); // T:[AP-14]
    }

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

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

    /// @return Address of key, reverts if 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); // T:[AP-1]
        return result; // T:[AP-3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
    }

    /// @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; // T:[AP-3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
        emit AddressSet(key, value); // T:[AP-2]
    }
}

// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

/// @dev DieselToken is LP token for Gearbox pools
contract DieselToken is ERC20, Ownable {
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) ERC20(name_, symbol_) {
        _setupDecimals(decimals_);
    }

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

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

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

import {PercentageMath} from "../math/PercentageMath.sol";

library Constants {
    uint256 constant MAX_INT =
        0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

    // 25% of MAX_INT
    uint256 constant MAX_INT_4 =
        0x3fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

    // REWARD FOR LEAN DEPLOYMENT MINING
    uint256 constant ACCOUNT_CREATION_REWARD = 1e5;
    uint256 constant DEPLOYMENT_COST = 1e17;

    // FEE = 10%
    uint256 constant FEE_INTEREST = 1000; // 10%

    // FEE + LIQUIDATION_FEE 2%
    uint256 constant FEE_LIQUIDATION = 200;

    // Liquidation premium 5%
    uint256 constant LIQUIDATION_DISCOUNTED_SUM = 9500;

    // 100% - LIQUIDATION_FEE - LIQUIDATION_PREMIUM
    uint256 constant UNDERLYING_TOKEN_LIQUIDATION_THRESHOLD =
        LIQUIDATION_DISCOUNTED_SUM - FEE_LIQUIDATION;

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

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

    // OPERATIONS
    uint8 constant OPERATION_CLOSURE = 1;
    uint8 constant OPERATION_REPAY = 2;
    uint8 constant OPERATION_LIQUIDATION = 3;

    // Decimals for leverage, so x4 = 4*LEVERAGE_DECIMALS for openCreditAccount function
    uint8 constant LEVERAGE_DECIMALS = 100;

    // Maximum withdraw fee for pool in percentage math format. 100 = 1%
    uint8 constant MAX_WITHDRAW_FEE = 100;

    uint256 constant CHI_THRESHOLD = 9950;
    uint256 constant HF_CHECK_INTERVAL_DEFAULT = 4;

    uint256 constant NO_SWAP = 0;
    uint256 constant UNISWAP_V2 = 1;
    uint256 constant UNISWAP_V3 = 2;
    uint256 constant CURVE_V1 = 3;
    uint256 constant LP_YEARN = 4;

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

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;


/// @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";

    //
    // CREDIT MANAGER
    //

    string public constant CM_NO_OPEN_ACCOUNT = "CM1";
    string
        public constant CM_ZERO_ADDRESS_OR_USER_HAVE_ALREADY_OPEN_CREDIT_ACCOUNT =
        "CM2";

    string public constant CM_INCORRECT_AMOUNT = "CM3";
    string public constant CM_CAN_LIQUIDATE_WITH_SUCH_HEALTH_FACTOR = "CM4";
    string public constant CM_CAN_UPDATE_WITH_SUCH_HEALTH_FACTOR = "CM5";
    string public constant CM_WETH_GATEWAY_ONLY = "CM6";
    string public constant CM_INCORRECT_PARAMS = "CM7";
    string public constant CM_INCORRECT_FEES = "CM8";
    string public constant CM_MAX_LEVERAGE_IS_TOO_HIGH = "CM9";
    string public constant CM_CANT_CLOSE_WITH_LOSS = "CMA";
    string public constant CM_TARGET_CONTRACT_iS_NOT_ALLOWED = "CMB";
    string public constant CM_TRANSFER_FAILED = "CMC";
    string public constant CM_INCORRECT_NEW_OWNER = "CME";

    //
    // 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_FILTER
    //

    string public constant CF_UNDERLYING_TOKEN_FILTER_CONFLICT = "CF0";
    string public constant CF_INCORRECT_LIQUIDATION_THRESHOLD = "CF1";
    string public constant CF_TOKEN_IS_NOT_ALLOWED = "CF2";
    string public constant CF_CREDIT_MANAGERS_ONLY = "CF3";
    string public constant CF_ADAPTERS_ONLY = "CF4";
    string public constant CF_OPERATION_LOW_HEALTH_FACTOR = "CF5";
    string public constant CF_TOO_MUCH_ALLOWED_TOKENS = "CF6";
    string public constant CF_INCORRECT_CHI_THRESHOLD = "CF7";
    string public constant CF_INCORRECT_FAST_CHECK = "CF8";
    string public constant CF_NON_TOKEN_CONTRACT = "CF9";
    string public constant CF_CONTRACT_IS_NOT_IN_ALLOWED_LIST = "CFA";
    string public constant CF_FAST_CHECK_NOT_COVERED_COLLATERAL_DROP = "CFB";
    string public constant CF_SOME_LIQUIDATION_THRESHOLD_MORE_THAN_NEW_ONE =
        "CFC";
    string public constant CF_ADAPTER_CAN_BE_USED_ONLY_ONCE = "CFD";
    string public constant CF_INCORRECT_PRICEFEED = "CFE";
    string public constant CF_TRANSFER_IS_NOT_ALLOWED = "CFF";
    string public constant CF_CREDIT_MANAGER_IS_ALREADY_SET = "CFG";

    //
    // CREDIT ACCOUNT
    //

    string public constant CA_CONNECTED_CREDIT_MANAGER_ONLY = "CA1";
    string public constant CA_FACTORY_ONLY = "CA2";

    //
    // PRICE ORACLE
    //

    string public constant PO_PRICE_FEED_DOESNT_EXIST = "PO0";
    string public constant PO_TOKENS_WITH_DECIMALS_MORE_18_ISNT_ALLOWED = "PO1";
    string public constant PO_AGGREGATOR_DECIMALS_SHOULD_BE_18 = "PO2";

    //
    // 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";

    //
    // LEVERAGED ACTIONS
    //

    string public constant LA_INCORRECT_VALUE = "LA1";
    string public constant LA_HAS_VALUE_WITH_TOKEN_TRANSFER = "LA2";
    string public constant LA_UNKNOWN_SWAP_INTERFACE = "LA3";
    string public constant LA_UNKNOWN_LP_INTERFACE = "LA4";
    string public constant LA_LOWER_THAN_AMOUNT_MIN = "LA5";
    string public constant LA_TOKEN_OUT_IS_NOT_COLLATERAL = "LA6";

    //
    // YEARN PRICE FEED
    //
    string public constant YPF_PRICE_PER_SHARE_OUT_OF_RANGE = "YP1";
    string public constant YPF_INCORRECT_LIMITER_PARAMETERS = "YP2";

    //
    // 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";
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./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 () internal {
        _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());
    }
}

// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

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


/// @title ACL keeps admins addresses
/// More info: https://dev.gearbox.fi/security/roles
contract ACL is Ownable {
    mapping(address => bool) public pausableAdminSet;
    mapping(address => bool) public unpausableAdminSet;

    // Contract version
    uint256 public constant version = 1;

    // emits each time when new pausable admin added
    event PausableAdminAdded(address indexed newAdmin);

    // emits each time when pausable admin removed
    event PausableAdminRemoved(address indexed admin);

    // emits each time when new unpausable admin added
    event UnpausableAdminAdded(address indexed newAdmin);

    // emits each times when unpausable admin removed
    event UnpausableAdminRemoved(address indexed admin);

    /// @dev Adds pausable admin address
    /// @param newAdmin Address of new pausable admin
    function addPausableAdmin(address newAdmin)
        external
        onlyOwner // T:[ACL-1]
    {
        pausableAdminSet[newAdmin] = true; // T:[ACL-2]
        emit PausableAdminAdded(newAdmin); // T:[ACL-2]
    }

    /// @dev Removes pausable admin
    /// @param admin Address of admin which should be removed
    function removePausableAdmin(address admin)
        external
        onlyOwner // T:[ACL-1]
    {
        pausableAdminSet[admin] = false; // T:[ACL-3]
        emit PausableAdminRemoved(admin); // T:[ACL-3]
    }

    /// @dev Returns true if the address is pausable admin and false if not
    function isPausableAdmin(address addr) external view returns (bool) {
        return pausableAdminSet[addr]; // T:[ACL-2,3]
    }

    /// @dev Adds unpausable admin address to the list
    /// @param newAdmin Address of new unpausable admin
    function addUnpausableAdmin(address newAdmin)
        external
        onlyOwner // T:[ACL-1]
    {
        unpausableAdminSet[newAdmin] = true; // T:[ACL-4]
        emit UnpausableAdminAdded(newAdmin); // T:[ACL-4]
    }

    /// @dev Removes unpausable admin
    /// @param admin Address of admin to be removed
    function removeUnpausableAdmin(address admin)
        external
        onlyOwner // T:[ACL-1]
    {
        unpausableAdminSet[admin] = false; // T:[ACL-5]
        emit UnpausableAdminRemoved(admin); // T:[ACL-5]
    }

    /// @dev Returns true if the address is unpausable admin and false if not
    function isUnpausableAdmin(address addr) external view returns (bool) {
        return unpausableAdminSet[addr]; // T:[ACL-4,5]
    }

    /// @dev Returns true if addr has configurator rights
    function isConfigurator(address account) external view returns (bool) {
        return account == owner(); // T:[ACL-6]
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;


/// @title Optimised for front-end Address Provider interface
interface IAppAddressProvider {
    function getDataCompressor() external view returns (address);

    function getGearToken() external view returns (address);

    function getWethToken() external view returns (address);

    function getWETHGateway() external view returns (address);

    function getPriceOracle() external view returns (address);

    function getLeveragedActions() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;

/// @title POptimised for front-end Pool Service Interface
interface IAppPoolService {

    function addLiquidity(
        uint256 amount,
        address onBehalfOf,
        uint256 referralCode
    ) external;

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

}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;
pragma abicoder v2;

import {DataTypes} from "../../libraries/data/Types.sol";


/// @title Optimised for front-end credit Manager interface
/// @notice It's optimised for light-weight abi
interface IAppCreditManager {
    function openCreditAccount(
        uint256 amount,
        address onBehalfOf,
        uint256 leverageFactor,
        uint256 referralCode
    ) external;

    function closeCreditAccount(address to, DataTypes.Exchange[] calldata paths)
        external;

    function repayCreditAccount(address to) external;

    function increaseBorrowedAmount(uint256 amount) external;

    function addCollateral(
        address onBehalfOf,
        address token,
        uint256 amount
    ) external;

    function calcRepayAmount(address borrower, bool isLiquidated)
        external
        view
        returns (uint256);

    function getCreditAccountOrRevert(address borrower)
        external
        view
        returns (address);

    function hasOpenedCreditAccount(address borrower)
        external
        view
        returns (bool);

    function defaultSwapContract() external view returns (address);
}

// SPDX-License-Identifier: GPL-2.0-or-later
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;


/// @title DataType library
/// @notice Contains data types used in data compressor.
library DataTypes {
    struct Exchange {
        address[] path;
        uint256 amountOutMin;
    }

    struct TokenBalance {
        address token;
        uint256 balance;
        bool isAllowed;
    }

    struct ContractAdapter {
        address allowedContract;
        address adapter;
    }

    struct CreditAccountData {
        address addr;
        address borrower;
        bool inUse;
        address creditManager;
        address underlyingToken;
        uint256 borrowedAmountPlusInterest;
        uint256 totalValue;
        uint256 healthFactor;
        uint256 borrowRate;
        TokenBalance[] balances;
    }

    struct CreditAccountDataExtended {
        address addr;
        address borrower;
        bool inUse;
        address creditManager;
        address underlyingToken;
        uint256 borrowedAmountPlusInterest;
        uint256 totalValue;
        uint256 healthFactor;
        uint256 borrowRate;
        TokenBalance[] balances;
        uint256 repayAmount;
        uint256 liquidationAmount;
        bool canBeClosed;
        uint256 borrowedAmount;
        uint256 cumulativeIndexAtOpen;
        uint256 since;
    }

    struct CreditManagerData {
        address addr;
        bool hasAccount;
        address underlyingToken;
        bool isWETH;
        bool canBorrow;
        uint256 borrowRate;
        uint256 minAmount;
        uint256 maxAmount;
        uint256 maxLeverageFactor;
        uint256 availableLiquidity;
        address[] allowedTokens;
        ContractAdapter[] adapters;
    }

    struct PoolData {
        address addr;
        bool isWETH;
        address underlyingToken;
        address dieselToken;
        uint256 linearCumulativeIndex;
        uint256 availableLiquidity;
        uint256 expectedLiquidity;
        uint256 expectedLiquidityLimit;
        uint256 totalBorrowed;
        uint256 depositAPY_RAY;
        uint256 borrowAPY_RAY;
        uint256 dieselRate_RAY;
        uint256 withdrawFee;
        uint256 cumulativeIndex_RAY;
        uint256 timestampLU;
    }

    struct TokenInfo {
        address addr;
        string symbol;
        uint8 decimals;
    }

    struct AddressProviderData {
        address contractRegister;
        address acl;
        address priceOracle;
        address traderAccountFactory;
        address dataCompressor;
        address farmingFactory;
        address accountMiner;
        address treasuryContract;
        address gearToken;
        address wethToken;
        address wethGateway;
    }

    struct MiningApproval {
        address token;
        address swapContract;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.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 guidelines: functions revert instead
 * of 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 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }

    /**
     * @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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(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:
     *
     * - `to` 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 = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(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);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @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 to 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 { }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000cf64698aff7e5f27a11dff868af228653ba53be00000000000000000000000006b175474e89094c44da98b954eedeac495271d0f0000000000000000000000006cfaf95457d7688022fc53e7abe052ef8dfbbdba000000000000000000000000f37d605f6428576529657e24dfb439803f602118000000000000000000000000000000000000000000027b46536c66c8e3000000

-----Decoded View---------------
Arg [0] : _addressProvider (address): 0xcF64698AFF7E5f27A11dff868AF228653ba53be0
Arg [1] : _underlyingToken (address): 0x6B175474E89094C44Da98b954EedeAC495271d0F
Arg [2] : _dieselAddress (address): 0x6CFaF95457d7688022FC53e7AbE052ef8DFBbdBA
Arg [3] : _interestRateModelAddress (address): 0xf37d605F6428576529657E24dFb439803f602118
Arg [4] : _expectedLiquidityLimit (uint256): 3000000000000000000000000

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000cf64698aff7e5f27a11dff868af228653ba53be0
Arg [1] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [2] : 0000000000000000000000006cfaf95457d7688022fc53e7abe052ef8dfbbdba
Arg [3] : 000000000000000000000000f37d605f6428576529657e24dfb439803f602118
Arg [4] : 000000000000000000000000000000000000000000027b46536c66c8e3000000