// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2021
pragma solidity ^0.7.4;
pragma abicoder v2;

import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/EnumerableSet.sol";
import {PercentageMath} from "../libraries/math/PercentageMath.sol";

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

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


/// @title CreditFilter
/// @notice Implements filter logic for allowed tokens & contract-adapters
///   - Sets/Gets tokens for allowed tokens list
///   - Sets/Gets adapters & allowed contracts
///   - Calculates total value for credit account
///   - Calculates threshold weighted value for credit account
///   - Keeps enabled tokens for credit accounts
///
/// More: https://dev.gearbox.fi/developers/credit/credit-filter
contract CreditFilter is ICreditFilter, ACLTrait {
    using SafeMath for uint256;
    using EnumerableSet for EnumerableSet.AddressSet;

    AddressProvider public addressProvider;

    // Address of credit Manager
    address public creditManager;

    // Allowed tokens list
    mapping(address => bool) public override isTokenAllowed;

    // Allowed tokens array
    address[] public override allowedTokens;

    // Allowed contracts list
    mapping(address => uint256) public override liquidationThresholds;

    // map token address to its mask
    mapping(address => uint256) public tokenMasksMap;

    // credit account token enables mask. each bit (in order as tokens stored in allowedTokens array) set 1 if token was enable
    mapping(address => uint256) public override enabledTokens;

    // keeps last block we use fast check. Fast check is not allowed to use more than one time in block
    mapping(address => uint256) public fastCheckCounter;

    // Allowed contracts array
    EnumerableSet.AddressSet private allowedContractsSet;

    // Allowed adapters list
    mapping(address => bool) public allowedAdapters;

    // Mapping from allowed contract to allowed adapters
    // If contract is not allowed, contractToAdapter[contract] == address(0)
    mapping(address => address) public override contractToAdapter;

    // Price oracle - uses in evaluation credit account
    address public override priceOracle;

    // Underlying token address
    address public override underlyingToken;

    // Pooll Service address
    address public poolService;

    // Address of WETH token
    address public wethAddress;

    // Minimum chi threshold for fast check
    uint256 public chiThreshold;

    // Maxmimum allowed fast check operations between full health factor checks
    uint256 public hfCheckInterval;

    // Allowed transfers
    mapping(address => mapping(address => bool)) transfersAllowed;

    // Allowed plugins
    mapping(address => bool) public allowedPlugins;

    // Contract version
    uint256 public constant version = 1;

    /// Checks that sender is connected credit manager
    modifier creditManagerOnly {
        require(msg.sender == creditManager, Errors.CF_CREDIT_MANAGERS_ONLY); // T:[CF-20]
        _;
    }

    /// Checks that sender is adapter
    modifier adapterOnly {
        require(allowedAdapters[msg.sender], Errors.CF_ADAPTERS_ONLY); // T:[CF-20]
        _;
    }

    constructor(address _addressProvider, address _underlyingToken)
        ACLTrait(_addressProvider)
    {
        require(
            _addressProvider != address(0) && _underlyingToken != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        );
        addressProvider = AddressProvider(_addressProvider);
        priceOracle = addressProvider.getPriceOracle(); // T:[CF-21]
        wethAddress = addressProvider.getWethToken(); // T:[CF-21]

        underlyingToken = _underlyingToken; // T:[CF-21]

        liquidationThresholds[underlyingToken] = Constants
        .UNDERLYING_TOKEN_LIQUIDATION_THRESHOLD; // T:[CF-21]

        _allowToken(
            underlyingToken,
            Constants.UNDERLYING_TOKEN_LIQUIDATION_THRESHOLD
        ); // T:[CF-8, 21]

        _setFastCheckParameters(
            Constants.CHI_THRESHOLD,
            Constants.HF_CHECK_INTERVAL_DEFAULT
        ); // T:[CF-21]

        allowedPlugins[addressProvider.getWETHGateway()] = true;
    }

    //
    // STATE-CHANGING FUNCTIONS
    //

    /// @dev Adds token to the list of allowed tokens
    /// @param token Address of allowed token
    /// @param liquidationThreshold The credit Manager constant showing the maximum allowable ratio of Loan-To-Value for the i-th asset.
    function allowToken(address token, uint256 liquidationThreshold)
        external
        override
        configuratorOnly // T:[CF-1]
    {
        _allowToken(token, liquidationThreshold);
    }

    function _allowToken(address token, uint256 liquidationThreshold) internal {
        require(token != address(0), Errors.ZERO_ADDRESS_IS_NOT_ALLOWED); // T:[CF-2]

        require(
            liquidationThreshold > 0 &&
                liquidationThreshold <= liquidationThresholds[underlyingToken],
            Errors.CF_INCORRECT_LIQUIDATION_THRESHOLD
        ); // T:[CF-3]

        require(
            tokenMasksMap[token] > 0 || allowedTokens.length < 256,
            Errors.CF_TOO_MUCH_ALLOWED_TOKENS
        ); // T:[CF-5]

        // Checks that contract has balanceOf method and it returns uint256
        require(IERC20(token).balanceOf(address(this)) >= 0); // T:[CF-11]

        // Checks that pair token - underlyingToken has priceFeed
        require(
            IPriceOracle(priceOracle).getLastPrice(token, underlyingToken) > 0,
            Errors.CF_INCORRECT_PRICEFEED
        );

        // we add allowed tokens to array if it wasn't added before
        // T:[CF-6] controls that
        if (!isTokenAllowed[token]) {
            isTokenAllowed[token] = true; // T:[CF-4]
            tokenMasksMap[token] = 1 << allowedTokens.length; // T:[CF-4]
            allowedTokens.push(token); // T:[CF-4]
        }

        liquidationThresholds[token] = liquidationThreshold; // T:[CF-4, 6]
        emit TokenAllowed(token, liquidationThreshold); // T:[CF-4]
    }

    /// @dev Forbid token. To allow token one more time use allowToken function
    /// @param token Address of forbidden token
    function forbidToken(address token)
        external
        configuratorOnly // T:[CF-1]
    {
        isTokenAllowed[token] = false; // T: [CF-35, 36]
        emit TokenForbidden(token);
    }

    /// @dev Adds contract and adapter to the list of allowed contracts
    /// if contract exists it updates adapter only
    /// @param targetContract Address of allowed contract
    /// @param adapter Adapter contract address
    function allowContract(address targetContract, address adapter)
        external
        override
        configuratorOnly // T:[CF-1]
    {
        require(
            targetContract != address(0) && adapter != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        ); // T:[CF-2]

        require(
            allowedAdapters[adapter] == false,
            Errors.CF_ADAPTER_CAN_BE_USED_ONLY_ONCE
        ); // ToDo: add check

        // Remove previous adapter from allowed list and set up new one
        allowedAdapters[contractToAdapter[targetContract]] = false; // T:[CF-10]
        allowedAdapters[adapter] = true; // T:[CF-9, 10]

        allowedContractsSet.add(targetContract);
        contractToAdapter[targetContract] = adapter; // T:[CF-9, 10]

        emit ContractAllowed(targetContract, adapter); // T:[CF-12]
    }

    /// @dev Forbids contract to use with credit manager
    /// @param targetContract Address of contract to be forbidden
    function forbidContract(address targetContract)
        external
        override
        configuratorOnly // T:[CF-1]
    {
        require(
            targetContract != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        ); // T:[CF-2]

        require(
            allowedContractsSet.remove(targetContract),
            Errors.CF_CONTRACT_IS_NOT_IN_ALLOWED_LIST
        ); // T:[CF-31]

        // Remove previous adapter from allowed list
        allowedAdapters[contractToAdapter[targetContract]] = false; // T:[CF-32]

        // Sets adapter to address(0), which means to forbid it usage
        contractToAdapter[targetContract] = address(0); // T:[CF-32]

        emit ContractForbidden(targetContract); // T:[CF-32]
    }

    /// @dev Connects credit manager and checks that it has the same underlying token as pool
    function connectCreditManager(address _creditManager)
        external
        override
        configuratorOnly // T:[CF-1]
    {
        require(
            _creditManager != address(0),
            Errors.ZERO_ADDRESS_IS_NOT_ALLOWED
        );

        require(
            creditManager == address(0),
            Errors.CF_CREDIT_MANAGER_IS_ALREADY_SET
        ); // T:[CF-9,13]

        creditManager = _creditManager; // T:[CF-14]
        poolService = ICreditManager(_creditManager).poolService(); //  T:[CF-14]

        require(
            IPoolService(poolService).underlyingToken() == underlyingToken,
            Errors.CF_UNDERLYING_TOKEN_FILTER_CONFLICT
        ); // T:[CF-16]
    }

    function upgradePriceOracle() external configuratorOnly {
        priceOracle = addressProvider.getPriceOracle(); // ToDo:
        emit PriceOracleUpdated(priceOracle);
    }

    /// @dev Checks the 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
        override
        adapterOnly // T:[CF-20]
    {
        _checkAndEnableToken(creditAccount, tokenOut); // T:[CF-22]

        // Convert to WETH is more gas efficient and doesn't make difference for ratio
        uint256 amountInCollateral = IPriceOracle(priceOracle).convert(
            amountIn,
            tokenIn,
            wethAddress
        ); // T:[CF-24]

        // Convert to WETH is more gas efficient and doesn't make difference for ratio
        uint256 amountOutCollateral = IPriceOracle(priceOracle).convert(
            amountOut,
            tokenOut,
            wethAddress
        ); // T:[CF-24]

        _checkCollateral(
            creditAccount,
            amountInCollateral,
            amountOutCollateral
        );
    }

    /// @dev Checks collateral for operation which returns more than 1 token
    /// @param creditAccount Address of credit account
    /// @param tokenOut Addresses of returned tokens
    function checkMultiTokenCollateral(
        address creditAccount,
        uint256[] memory amountIn,
        uint256[] memory amountOut,
        address[] memory tokenIn,
        address[] memory tokenOut
    )
        external
        override
        adapterOnly // T:[CF-20]
    {
        // Convert to WETH is more gas efficient and doesn't make difference for ratio
        uint256 amountInCollateral;
        uint256 amountOutCollateral;

        require(
            amountIn.length == tokenIn.length &&
                amountOut.length == tokenOut.length,
            Errors.INCORRECT_ARRAY_LENGTH
        );

        for (uint256 i = 0; i < amountIn.length; i++) {
            amountInCollateral = amountInCollateral.add(
                IPriceOracle(priceOracle).convert(
                    amountIn[i],
                    tokenIn[i],
                    wethAddress
                )
            );
        }

        for (uint256 i = 0; i < amountOut.length; i++) {
            _checkAndEnableToken(creditAccount, tokenOut[i]); // T: [CF-33]
            amountOutCollateral = amountOutCollateral.add(
                IPriceOracle(priceOracle).convert(
                    amountOut[i],
                    tokenOut[i],
                    wethAddress
                )
            );
        }

        _checkCollateral(
            creditAccount,
            amountInCollateral,
            amountOutCollateral
        ); // T: [CF-33]
    }

    /// @dev Checks health factor after operations
    /// @param creditAccount Address of credit account
    function _checkCollateral(
        address creditAccount,
        uint256 collateralIn,
        uint256 collateralOut
    ) internal {
        if (
            (collateralOut.mul(PercentageMath.PERCENTAGE_FACTOR) >
                collateralIn.mul(chiThreshold)) &&
            fastCheckCounter[creditAccount] <= hfCheckInterval
        ) {
            fastCheckCounter[creditAccount]++; // T:[CF-25, 33]
        } else {
            // Require Hf > 1

            require(
                calcCreditAccountHealthFactor(creditAccount) >=
                    PercentageMath.PERCENTAGE_FACTOR,
                Errors.CF_OPERATION_LOW_HEALTH_FACTOR
            ); // T:[CF-25, 33, 34]
            fastCheckCounter[creditAccount] = 1; // T:[CF-34]
        }
    }

    /// @dev Initializes enabled tokens
    function initEnabledTokens(address creditAccount)
        external
        override
        creditManagerOnly // T:[CF-20]
    {
        // at opening account underlying token is enabled only
        enabledTokens[creditAccount] = 1; // T:[CF-19]
        fastCheckCounter[creditAccount] = 1; // T:[CF-19]
    }

    /// @dev Checks that token is in allowed list and updates enabledTokenMask
    /// for provided credit account if needed
    /// @param creditAccount Address of credit account
    /// @param token Address of token to be checked
    function checkAndEnableToken(address creditAccount, address token)
        external
        override
        creditManagerOnly // T:[CF-20]
    {
        _checkAndEnableToken(creditAccount, token); // T:[CF-22, 23]
    }

    /// @dev Checks that token is in allowed list and updates enabledTokenMask
    /// for provided credit account if needed
    /// @param creditAccount Address of credit account
    /// @param token Address of token to be checked
    function _checkAndEnableToken(address creditAccount, address token)
        internal
    {
        revertIfTokenNotAllowed(token); //T:[CF-22, 36]

        if (enabledTokens[creditAccount] & tokenMasksMap[token] == 0) {
            enabledTokens[creditAccount] =
                enabledTokens[creditAccount] |
                tokenMasksMap[token];
        } // T:[CF-23]
    }

    /// @dev Sets fast check parameters chi & hfCheckCollateral
    /// It reverts if 1 - chi ** hfCheckCollateral > feeLiquidation
    function setFastCheckParameters(
        uint256 _chiThreshold,
        uint256 _hfCheckInterval
    )
        external
        configuratorOnly // T:[CF-1]
    {
        _setFastCheckParameters(_chiThreshold, _hfCheckInterval);
    }

    function _setFastCheckParameters(
        uint256 _chiThreshold,
        uint256 _hfCheckInterval
    ) internal {
        chiThreshold = _chiThreshold; // T:[CF-30]
        hfCheckInterval = _hfCheckInterval; // T:[CF-30]

        revertIfIncorrectFastCheckParams();

        emit NewFastCheckParameters(_chiThreshold, _hfCheckInterval); // T:[CF-30]
    }

    /// @dev It updates liquidation threshold for underlying token threshold
    /// to have enough buffer for liquidation (liquidaion premium + fee liq.)
    /// It reverts if that buffer is less with new paremters, or there is any
    /// liquidaiton threshold > new LT
    function updateUnderlyingTokenLiquidationThreshold()
        external
        override
        creditManagerOnly // T:[CF-20]
    {
        require(
            ICreditManager(creditManager).feeInterest() <
                PercentageMath.PERCENTAGE_FACTOR &&
                ICreditManager(creditManager).feeLiquidation() <
                PercentageMath.PERCENTAGE_FACTOR &&
                ICreditManager(creditManager).liquidationDiscount() <
                PercentageMath.PERCENTAGE_FACTOR,
            Errors.CM_INCORRECT_FEES
        ); // T:[CM-36]

        // Otherwise, new credit account will be immediately liquidated
        require(
            ICreditManager(creditManager).minHealthFactor() >
                PercentageMath.PERCENTAGE_FACTOR,
            Errors.CM_MAX_LEVERAGE_IS_TOO_HIGH
        ); // T:[CM-40]

        liquidationThresholds[underlyingToken] = ICreditManager(creditManager)
        .liquidationDiscount()
        .sub(ICreditManager(creditManager).feeLiquidation()); // T:[CF-38]

        for (uint256 i = 1; i < allowedTokens.length; i++) {
            require(
                liquidationThresholds[allowedTokens[i]] <=
                    liquidationThresholds[underlyingToken],
                Errors.CF_SOME_LIQUIDATION_THRESHOLD_MORE_THAN_NEW_ONE
            ); // T:[CF-39]
        }

        revertIfIncorrectFastCheckParams(); // T:[CF-39]
    }

    /// @dev It checks that 1 - chi ** hfCheckInterval < feeLiquidation
    function revertIfIncorrectFastCheckParams() internal view {
        // if credit manager is set, we add additional check
        if (creditManager != address(0)) {
            // computes maximum possible collateral drop between two health factor checks
            uint256 maxPossibleDrop = PercentageMath.PERCENTAGE_FACTOR.sub(
                calcMaxPossibleDrop(chiThreshold, hfCheckInterval)
            ); // T:[CF-39]

            require(
                maxPossibleDrop <
                    ICreditManager(creditManager).feeLiquidation(),
                Errors.CF_FAST_CHECK_NOT_COVERED_COLLATERAL_DROP
            ); // T:[CF-39]
        }
    }

    // @dev it computes percentage ** times
    // @param percentage Percentage in PERCENTAGE FACTOR format
    function calcMaxPossibleDrop(uint256 percentage, uint256 times)
        public
        pure
        returns (uint256 value)
    {
        value = PercentageMath.PERCENTAGE_FACTOR.mul(percentage); // T:[CF-37]
        for (uint256 i = 0; i < times.sub(1); i++) {
            value = value.mul(percentage).div(PercentageMath.PERCENTAGE_FACTOR); // T:[CF-37]
        }
        value = value.div(PercentageMath.PERCENTAGE_FACTOR); // T:[CF-37]
    }

    //
    // GETTERS
    //

    /// @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
        override
        returns (uint256 total)
    {
        uint256 tokenMask;
        uint256 eTokens = enabledTokens[creditAccount];
        for (uint256 i = 0; i < allowedTokens.length; i++) {
            tokenMask = 1 << i; // T:[CF-17]
            if (eTokens & tokenMask > 0) {
                (, , uint256 tv, ) = getCreditAccountTokenById(
                    creditAccount,
                    i
                );
                total = total.add(tv);
            } // T:[CF-17]
        }
    }

    /// @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)
        public
        view
        override
        returns (uint256 total)
    {
        uint256 tokenMask;
        uint256 eTokens = enabledTokens[creditAccount];
        for (uint256 i = 0; i < allowedTokens.length; i++) {
            tokenMask = 1 << i; // T:[CF-18]
            if (eTokens & tokenMask > 0) {
                (, , , uint256 twv) = getCreditAccountTokenById(
                    creditAccount,
                    i
                );
                total = total.add(twv);
            }
        } // T:[CF-18]
        return total.div(PercentageMath.PERCENTAGE_FACTOR); // T:[CF-18]
    }

    /// @dev Returns quantity of tokens in allowed list
    function allowedTokensCount() external view override returns (uint256) {
        return allowedTokens.length; // T:[CF-4, 6]
    }

    /// @dev Reverts if token isn't in token allowed list
    function revertIfTokenNotAllowed(address token) public view override {
        require(isTokenAllowed[token], Errors.CF_TOKEN_IS_NOT_ALLOWED); // T:[CF-7, 36]
    }

    /// @dev Returns quantity of contracts in allowed list
    function allowedContractsCount() external view override returns (uint256) {
        return allowedContractsSet.length(); // T:[CF-9]
    }

    /// @dev Returns allowed contract by index
    function allowedContracts(uint256 i)
        external
        view
        override
        returns (address)
    {
        return allowedContractsSet.at(i); // T:[CF-9]
    }

    /// @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
    /// @return tv Balance converted to undelying asset using price oracle
    /// @return tvw Balance converted to undelying asset using price oracle multipled with liquidation threshold
    function getCreditAccountTokenById(address creditAccount, uint256 id)
        public
        view
        override
        returns (
            address token,
            uint256 balance,
            uint256 tv,
            uint256 tvw
        )
    {
        token = allowedTokens[id]; // T:[CF-28]
        balance = IERC20(token).balanceOf(creditAccount); // T:[CF-28]

        // balance ==0 : T: [CF-28]
        if (balance > 1) {
            tv = IPriceOracle(priceOracle).convert(
                balance,
                token,
                underlyingToken
            ); // T:[CF-28]
            tvw = tv.mul(liquidationThresholds[token]); // T:[CF-28]
        }
    }

    /// @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)
        public
        view
        override
        returns (uint256)
    {
        return
            ICreditAccount(creditAccount)
                .borrowedAmount()
                .mul(IPoolService(poolService).calcLinearCumulative_RAY())
                .div(ICreditAccount(creditAccount).cumulativeIndexAtOpen()); // T: [CF-26]
    }

    /**
     * @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)
        public
        view
        override
        returns (uint256)
    {
        return
            calcThresholdWeightedValue(creditAccount)
                .mul(PercentageMath.PERCENTAGE_FACTOR)
                .div(calcCreditAccountAccruedInterest(creditAccount)); // T:[CF-27]
    }

    function revertIfCantIncreaseBorrowing(
        address creditAccount,
        uint256 minHealthFactor
    ) external view override {
        require(
            calcCreditAccountHealthFactor(creditAccount) >= minHealthFactor,
            Errors.CM_CAN_UPDATE_WITH_SUCH_HEALTH_FACTOR
        ); // T:[CM-28]
    }

    function approveAccountTransfers(address from, bool state)
        external
        override
    {
        transfersAllowed[from][msg.sender] = state; // T:[CF-43]
        emit TransferAccountAllowed(from, msg.sender, state); // T:[CF-43]
    }

    function allowanceForAccountTransfers(address from, address to)
        external
        view
        override
        returns (bool)
    {
        return transfersAllowed[from][to]; // T:[CF-43]
    }

    function allowPlugin(address plugin, bool state) external configuratorOnly {
        allowedPlugins[plugin] = state;
        emit TransferPluginAllowed(plugin, state);
    }

    function revertIfAccountTransferIsNotAllowed(
        address owner,
        address newOwner
    ) external view override {
        if (!allowedPlugins[owner] || allowedPlugins[newOwner]) {
            require(
                transfersAllowed[owner][newOwner],
                Errors.CF_TRANSFER_IS_NOT_ALLOWED
            ); // T:[CF-43, 44]
        }
    }
}

// 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: 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;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

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


/// @title Reusable Credit Account interface
/// @notice Implements general credit account:
///   - Keeps token balances
///   - Keeps token balances
///   - Stores general parameters: borrowed amount, cumulative index at open and block when it was initialized
///   - Approves tokens for 3rd party contracts
///   - Transfers assets
///   - Execute financial orders
///
///  More: https://dev.gearbox.fi/developers/creditManager/vanillacreditAccount

interface ICreditAccount {
    /// @dev Initializes clone contract
    function initialize() external;

    /// @dev Connects credit account to credit manager
    /// @param _creditManager Credit manager address
    function connectTo(
        address _creditManager,
        uint256 _borrowedAmount,
        uint256 _cumulativeIndexAtOpen
    ) external;

    //    /// @dev Set general credit account parameters. Restricted to credit managers only
    //    /// @param _borrowedAmount Amount which pool lent to credit account
    //    /// @param _cumulativeIndexAtOpen Cumulative index at open. Uses for interest calculation
    //    function setGenericParameters(
    //
    //    ) external;

    /// @dev Updates borrowed amount. Restricted to credit managers only
    /// @param _borrowedAmount Amount which pool lent to credit account
    function updateParameters(
        uint256 _borrowedAmount,
        uint256 _cumulativeIndexAtOpen
    ) external;

    /// @dev Approves particular token for swap contract
    /// @param token ERC20 token for allowance
    /// @param swapContract Swap contract address
    function approveToken(address token, address swapContract) external;

    /// @dev Cancels allowance for particular contract
    /// @param token Address of token for allowance
    /// @param targetContract Address of contract to cancel allowance
    function cancelAllowance(address token, address targetContract) external;

    /// Transfers tokens from credit account to provided address. Restricted for pool calls only
    /// @param token Token which should be tranferred from credit account
    /// @param to Address of recipient
    /// @param amount Amount to be transferred
    function safeTransfer(
        address token,
        address to,
        uint256 amount
    ) external;

    /// @dev Returns borrowed amount
    function borrowedAmount() external view returns (uint256);

    /// @dev Returns cumulative index at time of opening credit account
    function cumulativeIndexAtOpen() external view returns (uint256);

    /// @dev Returns Block number when it was initialised last time
    function since() external view returns (uint256);

    /// @dev Address of last connected credit manager
    function creditManager() external view returns (address);

    /// @dev Address of last connected credit manager
    function factory() external view returns (address);

    /// @dev Executed financial order on 3rd party service. Restricted for pool calls only
    /// @param destination Contract address which should be called
    /// @param data Call data which should be sent
    function execute(address destination, bytes memory data)
        external
        returns (bytes memory);
}

// 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 Price oracle interface
interface IPriceOracle {

    // Emits each time new configurator is set up
    event NewPriceFeed(address indexed token, address indexed priceFeed);

    /**
     * @dev Sets price feed if it doesn't exists
     * If pricefeed exists, it changes nothing
     * This logic is done to protect Gearbox from priceOracle attack
     * when potential attacker can get access to price oracle, change them to fraud ones
     * and then liquidate all funds
     * @param token Address of token
     * @param priceFeedToken Address of chainlink price feed token => Eth
     */
    function addPriceFeed(address token, address priceFeedToken) external;

    /**
     * @dev Converts one asset into another using rate. Reverts if price feed doesn't exist
     *
     * @param amount Amount to convert
     * @param tokenFrom Token address converts from
     * @param tokenTo Token address - converts to
     * @return Amount converted to tokenTo asset
     */
    function convert(
        uint256 amount,
        address tokenFrom,
        address tokenTo
    ) external view returns (uint256);

    /**
     * @dev Gets token rate with 18 decimals. Reverts if priceFeed doesn't exist
     *
     * @param tokenFrom Converts from token address
     * @param tokenTo Converts to token address
     * @return Rate in WAD format
     */
    function getLastPrice(address tokenFrom, address tokenTo)
        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;
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: 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 {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: 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: 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: 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;


/// @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 >=0.6.0 <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: 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]
    }
}

{
  "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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