// File: contracts/protocol/leverage/ethereum/FRAXUSDCLevSwap.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import {GeneralLevSwap} from '../GeneralLevSwap.sol';
import {IERC20} from '../../../dependencies/openzeppelin/contracts/IERC20.sol';
import {SafeERC20} from '../../../dependencies/openzeppelin/contracts/SafeERC20.sol';
import {UniswapAdapter} from '../../libraries/swap/UniswapAdapter.sol';

interface ICurvePool {
  function coins(uint256) external view returns (address);

  function add_liquidity(uint256[2] memory amounts, uint256 _min_mint_amount) external;

  function calc_withdraw_one_coin(uint256 _token_amount, int128 i) external view returns (uint256);

  function remove_liquidity_one_coin(
    uint256 _token_amount,
    int128 i,
    uint256 _min_amount
  ) external returns (uint256);
}

contract FRAXUSDCLevSwap is GeneralLevSwap {
  using SafeERC20 for IERC20;

  ICurvePool public constant FRAXUSDC = ICurvePool(0xDcEF968d416a41Cdac0ED8702fAC8128A64241A2);

  address internal constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
  address internal constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
  address internal constant USDT = 0xdAC17F958D2ee523a2206206994597C13D831ec7;

  constructor(
    address _asset,
    address _vault,
    address _provider
  ) GeneralLevSwap(_asset, _vault, _provider) {
    ENABLED_STABLE_COINS[DAI] = true;
    ENABLED_STABLE_COINS[USDC] = true;
    ENABLED_STABLE_COINS[USDT] = true;
  }

  function getAvailableStableCoins() external pure override returns (address[] memory assets) {
    assets = new address[](3);
    assets[0] = DAI;
    assets[1] = USDC;
    assets[2] = USDT;
  }

  function _swapToUSDC(address _stableAsset, uint256 _amount) internal returns (uint256) {
    UniswapAdapter.Path memory path;
    path.tokens = new address[](2);
    path.tokens[0] = _stableAsset;
    path.tokens[1] = USDC;

    path.fees = new uint256[](1);
    path.fees[0] = 100; //0.01%

    return
      UniswapAdapter.swapExactTokensForTokens(PROVIDER, _stableAsset, USDC, _amount, path, 500);
  }

  function _swapFromUSDC(address _stableAsset, uint256 _usdc_amount) internal returns (uint256) {
    UniswapAdapter.Path memory path;
    path.tokens = new address[](2);
    path.tokens[0] = USDC;
    path.tokens[1] = _stableAsset;

    path.fees = new uint256[](1);
    path.fees[0] = 100; //0.01%

    return
      UniswapAdapter.swapExactTokensForTokens(
        PROVIDER,
        USDC,
        _stableAsset,
        _usdc_amount,
        path,
        500
      );
  }

  function _swapTo(address _stableAsset, uint256 _amount) internal override returns (uint256) {
    uint256 amountTo = _amount;

    if (_stableAsset != USDC) {
      amountTo = _swapToUSDC(_stableAsset, _amount);
    }
    IERC20(USDC).safeApprove(address(FRAXUSDC), 0);
    IERC20(USDC).safeApprove(address(FRAXUSDC), amountTo);

    uint256[2] memory amountsAdded;
    amountsAdded[1] = amountTo;
    FRAXUSDC.add_liquidity(amountsAdded, 0);
    return IERC20(COLLATERAL).balanceOf(address(this));
  }

  // FRAXUSDC -> stable coin
  function _swapFrom(address _stableAsset) internal override returns (uint256) {
    int256 coinIndex = 1;
    uint256 collateralAmount = IERC20(COLLATERAL).balanceOf(address(this));
    uint256 minAmount = FRAXUSDC.calc_withdraw_one_coin(collateralAmount, int128(coinIndex));
    uint256 usdcAmount = FRAXUSDC.remove_liquidity_one_coin(
      collateralAmount,
      int128(coinIndex),
      minAmount
    );

    if (_stableAsset == USDC) {
      return usdcAmount;
    }

    return _swapFromUSDC(_stableAsset, usdcAmount);
  }
}

// File: contracts/protocol/leverage/GeneralLevSwap.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol';
import {IERC20Detailed} from '../../dependencies/openzeppelin/contracts/IERC20Detailed.sol';
import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol';
import {IPriceOracleGetter} from '../../interfaces/IPriceOracleGetter.sol';
import {ILendingPool} from '../../interfaces/ILendingPool.sol';
import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol';
import {PercentageMath} from '../libraries/math/PercentageMath.sol';
import {IGeneralVault} from '../../interfaces/IGeneralVault.sol';
import {IAToken} from '../../interfaces/IAToken.sol';
import {IFlashLoanReceiver} from '../../flashloan/interfaces/IFlashLoanReceiver.sol';
import {IVaultWhitelist} from '../../interfaces/IVaultWhitelist.sol';
import {IAaveFlashLoan} from '../../interfaces/IAaveFlashLoan.sol';
import {DataTypes} from '../libraries/types/DataTypes.sol';
import {ReserveConfiguration} from '../libraries/configuration/ReserveConfiguration.sol';
import {Math} from '../../dependencies/openzeppelin/contracts/Math.sol';
import {WadRayMath} from '../libraries/math/WadRayMath.sol';
import {Errors} from '../libraries/helpers/Errors.sol';

contract GeneralLevSwap is IFlashLoanReceiver {
  using SafeERC20 for IERC20;
  using PercentageMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using WadRayMath for uint256;

  uint256 private constant SAFE_BUFFER = 5000;

  uint256 private constant USE_VARIABLE_DEBT = 2;

  address private constant AAVE_LENDING_POOL_ADDRESS = 0x7937D4799803FbBe595ed57278Bc4cA21f3bFfCB;

  IVaultWhitelist internal constant VAULT_WHITELIST =
    IVaultWhitelist(0x88eE44794bAf865E3b0b192d1F9f0AC3Daf1EA0E);

  address public immutable COLLATERAL; // The addrss of external asset

  uint256 public immutable DECIMALS; // The collateral decimals

  address public immutable VAULT; // The address of vault

  ILendingPoolAddressesProvider internal immutable PROVIDER;

  IPriceOracleGetter internal immutable ORACLE;

  ILendingPool internal immutable LENDING_POOL;

  mapping(address => bool) ENABLED_STABLE_COINS;

  event EnterPosition(
    address indexed user,
    uint256 amount,
    uint256 iterations,
    uint256 ltv,
    address indexed borrowedCoin
  );

  event LeavePosition(uint256 amount, address indexed borrowedCoin);

  /**
   * @param _asset The external asset ex. wFTM
   * @param _vault The deployed vault address
   * @param _provider The deployed AddressProvider
   */
  constructor(
    address _asset,
    address _vault,
    address _provider
  ) {
    require(
      _asset != address(0) && _provider != address(0) && _vault != address(0),
      Errors.LS_INVALID_CONFIGURATION
    );

    COLLATERAL = _asset;
    DECIMALS = IERC20Detailed(_asset).decimals();
    VAULT = _vault;
    PROVIDER = ILendingPoolAddressesProvider(_provider);
    ORACLE = IPriceOracleGetter(PROVIDER.getPriceOracle());
    LENDING_POOL = ILendingPool(PROVIDER.getLendingPool());
    IERC20(COLLATERAL).approve(_vault, type(uint256).max);
  }

  /**
   * Get stable coins available to borrow
   */
  function getAvailableStableCoins() external pure virtual returns (address[] memory) {
    return new address[](0);
  }

  function _getAssetPrice(address _asset) internal view returns (uint256) {
    return ORACLE.getAssetPrice(_asset);
  }

  /**
   * This function is called after your contract has received the flash loaned amount
   * overriding executeOperation() in IFlashLoanReceiver
   */
  function executeOperation(
    address[] calldata assets,
    uint256[] calldata amounts,
    uint256[] calldata premiums,
    address initiator,
    bytes calldata params
  ) external override returns (bool) {
    require(initiator == address(this), Errors.LS_INVALID_CONFIGURATION);
    require(msg.sender == AAVE_LENDING_POOL_ADDRESS, Errors.LS_INVALID_CONFIGURATION);

    _executeOperation(assets[0], amounts[0], premiums[0], params);

    // approve the Aave LendingPool contract allowance to *pull* the owed amount
    IERC20(assets[0]).safeApprove(AAVE_LENDING_POOL_ADDRESS, 0);
    IERC20(assets[0]).safeApprove(AAVE_LENDING_POOL_ADDRESS, amounts[0] + premiums[0]);

    return true;
  }

  function _executeOperation(
    address asset,
    uint256 borrowAmount,
    uint256 fee,
    bytes calldata params
  ) internal {
    // parse params
    (bool isEnterPosition, uint256 arg0, uint256 arg1, address arg2, address arg3) = abi.decode(
      params,
      (bool, uint256, uint256, address, address)
    );
    if (isEnterPosition) {
      _enterPositionWithFlashloan(arg1, arg2, asset, borrowAmount, fee);
    } else {
      // _leavePositionWithFlashloan(arg0, arg1, arg2, arg3, asset, borrowAmount);
      _withdrawWithFlashloan(arg0, arg1, arg2, arg3, asset, borrowAmount);
    }
  }

  /**
   * @param _principal - The amount of collateral
   * @param _iterations - Loop count
   * @param _ltv - The loan to value of the asset in 4 decimals ex. 82.5% == 82_50
   * @param _stableAsset - The borrowing stable coin address when leverage works
   */
  function enterPosition(
    uint256 _principal,
    uint256 _iterations,
    uint256 _ltv,
    address _stableAsset
  ) external {
    require(_principal != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_stableAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(IERC20(COLLATERAL).balanceOf(msg.sender) >= _principal, Errors.LS_SUPPLY_NOT_ALLOWED);

    IERC20(COLLATERAL).safeTransferFrom(msg.sender, address(this), _principal);

    leverage(msg.sender, _principal, _iterations, _ltv, _stableAsset);
  }

  /**
   * @param _principal - The amount of collateral
   * @param _leverage - Extra leverage value and must be greater than 0, ex. 300% = 300_00
   *                    _principal + _principal * _leverage should be used as collateral
   * @param _slippage - Slippage valule to borrow enough asset by flashloan,
   *                    Must be greater than 0%.
   *                    Borrowing amount = _principal * _leverage * _slippage
   * @param _stableAsset - The borrowing stable coin address when leverage works
   */
  function enterPositionWithFlashloan(
    uint256 _principal,
    uint256 _leverage,
    uint256 _slippage,
    address _stableAsset
  ) external {
    require(_principal != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_leverage != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_slippage != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_stableAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(IERC20(COLLATERAL).balanceOf(msg.sender) >= _principal, Errors.LS_SUPPLY_NOT_ALLOWED);

    IERC20(COLLATERAL).safeTransferFrom(msg.sender, address(this), _principal);

    leverageWithFlashloan(msg.sender, _principal, _leverage, _slippage, _stableAsset);
  }

  /**
   * @param _principal - The amount of collateral, uint256 max value should withdraw all collateral
   * @param _slippage - The slippage of the every withdrawal amount. 1% = 100
   * @param _iterations - Loop count
   * @param _stableAsset - The borrowing stable coin address when leverage works
   * @param _sAsset - staked asset address of collateral internal asset
   */
  function leavePosition(
    uint256 _principal,
    uint256 _slippage,
    uint256 _iterations,
    address _stableAsset,
    address _sAsset
  ) external {
    require(_principal != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_stableAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(_sAsset != address(0), Errors.LS_INVALID_CONFIGURATION);

    DataTypes.ReserveConfigurationMap memory configuration = LENDING_POOL.getConfiguration(
      IAToken(_sAsset).UNDERLYING_ASSET_ADDRESS()
    );
    (, uint256 assetLiquidationThreshold, , , ) = configuration.getParamsMemory();
    require(assetLiquidationThreshold != 0, Errors.LS_INVALID_CONFIGURATION);

    (, , , uint256 liquidationThreshold, uint256 ltv, ) = LENDING_POOL.getUserAccountData(
      msg.sender
    );
    uint256 normalHealthFactor = (WadRayMath.wad() * liquidationThreshold) / ltv;
    address variableDebtTokenAddress = LENDING_POOL
      .getReserveData(_stableAsset)
      .variableDebtTokenAddress;

    // reduce leverage to increase healthFactor
    if (_iterations != 0) {
      _reduceLeverageWithAmount(_sAsset, _stableAsset, _slippage, assetLiquidationThreshold, 0);
    } else {
      _reduceLeverageWithAmount(
        _sAsset,
        _stableAsset,
        _slippage,
        assetLiquidationThreshold,
        _principal
      );
      return;
    }

    uint256 count;
    do {
      // limit loop count
      require(count < _iterations, Errors.LS_REMOVE_ITERATION_OVER);

      // withdraw collateral keeping the normal healthFactor (T / LTV)
      uint256 availableAmount = _getWithdrawalAmount(
        _sAsset,
        msg.sender,
        assetLiquidationThreshold,
        normalHealthFactor
      );
      if (availableAmount == 0) break;

      uint256 requiredAmount = _principal - IERC20(COLLATERAL).balanceOf(address(this));
      uint256 removeAmount = Math.min(availableAmount, requiredAmount);
      IERC20(_sAsset).safeTransferFrom(msg.sender, address(this), removeAmount);
      _remove(removeAmount, _slippage, msg.sender);

      if (removeAmount == requiredAmount) break;

      uint256 debtAmount = _getDebtAmount(variableDebtTokenAddress, msg.sender);
      if (debtAmount != 0) {
        // swap collateral to stable coin
        // in this case, some collateral asset maybe remained because of convex (ex: sUSD)
        uint256 stableAssetAmount = _swapFrom(_stableAsset);
        uint256 repayAmount = Math.min(debtAmount, stableAssetAmount);
        // repay
        _repay(_stableAsset, repayAmount, msg.sender);
        if (stableAssetAmount > repayAmount) {
          // swap stable coin to collateral in case of extra ramined stable coin after repay
          _swapTo(_stableAsset, stableAssetAmount - repayAmount);
        }
      }

      count++;
    } while (true);

    // finally deliver the collateral to user
    IERC20(COLLATERAL).safeTransfer(msg.sender, IERC20(COLLATERAL).balanceOf(address(this)));

    emit LeavePosition(_principal, _stableAsset);
  }

  /**
   * @param _repayAmount - The amount of repay
   * @param _requiredAmount - The amount of collateral
   * @param _slippage1 - Slippage valule to borrow enough asset by flashloan,
   *                    Must be greater than 0%.
   * @param _slippage2 - The slippage of the every withdrawal amount. 1% = 100
   * @param _stableAsset - The borrowing stable coin address when leverage works
   * @param _sAsset - staked asset address of collateral internal asset
   */
  function withdrawWithFlashloan(
    uint256 _repayAmount,
    uint256 _requiredAmount,
    uint256 _slippage1,
    uint256 _slippage2,
    address _stableAsset,
    address _sAsset
  ) external {
    require(_repayAmount > 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_requiredAmount > 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_slippage1 > 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_slippage2 > 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_stableAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(_sAsset != address(0), Errors.LS_INVALID_CONFIGURATION);

    IAaveFlashLoan AAVE_LENDING_POOL = IAaveFlashLoan(AAVE_LENDING_POOL_ADDRESS);
    address[] memory assets = new address[](1);
    assets[0] = _stableAsset;

    uint256 debtAmount = _getDebtAmount(
      LENDING_POOL.getReserveData(_stableAsset).variableDebtTokenAddress,
      msg.sender
    );

    uint256[] memory amounts = new uint256[](1);
    amounts[0] = Math.min(_repayAmount, debtAmount);

    // 0 means revert the transaction if not validated
    uint256[] memory modes = new uint256[](1);
    modes[0] = 0;

    bytes memory params = abi.encode(
      false, /*leavePosition*/
      _slippage2,
      _requiredAmount,
      msg.sender,
      _sAsset
    );

    AAVE_LENDING_POOL.flashLoan(address(this), assets, amounts, modes, address(this), params, 0);
    // remained stable coin -> collateral
    _swapTo(_stableAsset, IERC20(_stableAsset).balanceOf(address(this)));

    uint256 collateralAmount = IERC20(COLLATERAL).balanceOf(address(this));
    if (collateralAmount > _requiredAmount) {
      _supply(collateralAmount - _requiredAmount, msg.sender);
      collateralAmount = _requiredAmount;
    }

    // finally deliver the collateral to user
    IERC20(COLLATERAL).safeTransfer(msg.sender, collateralAmount);
  }

  function _enterPositionWithFlashloan(
    uint256 _minAmount,
    address _user,
    address _stableAsset,
    uint256 _borrowedAmount,
    uint256 _fee
  ) internal {
    //swap stable coin to collateral
    uint256 collateralAmount = _swapTo(_stableAsset, _borrowedAmount);
    require(collateralAmount >= _minAmount, Errors.LS_SUPPLY_FAILED);

    //deposit collateral
    _supply(collateralAmount, _user);

    //borrow stable coin
    _borrow(_stableAsset, _borrowedAmount + _fee, _user);
  }

  function _withdrawWithFlashloan(
    uint256 _slippage,
    uint256 _requiredAmount,
    address _user,
    address _sAsset,
    address _stableAsset,
    uint256 _borrowedAmount
  ) internal {
    // repay
    _repay(_stableAsset, _borrowedAmount, _user);

    // withdraw collateral
    // get internal asset address
    address internalAsset = IAToken(_sAsset).UNDERLYING_ASSET_ADDRESS();
    // get reserve info of internal asset
    DataTypes.ReserveConfigurationMap memory configuration = LENDING_POOL.getConfiguration(
      internalAsset
    );
    (, uint256 assetLiquidationThreshold, , , ) = configuration.getParamsMemory();
    require(assetLiquidationThreshold != 0, Errors.LS_INVALID_CONFIGURATION);
    // get user info
    (
      uint256 totalCollateralETH,
      uint256 totalDebtETH,
      ,
      uint256 currentLiquidationThreshold,
      ,

    ) = LENDING_POOL.getUserAccountData(_user);

    uint256 withdrawalAmountETH = (((totalCollateralETH * currentLiquidationThreshold) /
      PercentageMath.PERCENTAGE_FACTOR -
      totalDebtETH) * PercentageMath.PERCENTAGE_FACTOR) / assetLiquidationThreshold;

    uint256 withdrawalAmount = Math.min(
      IERC20(_sAsset).balanceOf(_user),
      (withdrawalAmountETH * (10**DECIMALS)) / _getAssetPrice(COLLATERAL)
    );

    require(withdrawalAmount > _requiredAmount, Errors.LS_SUPPLY_NOT_ALLOWED);

    IERC20(_sAsset).safeTransferFrom(_user, address(this), withdrawalAmount);
    _remove(withdrawalAmount, _slippage, _user);

    // collateral -> stable
    _swapFrom(_stableAsset);
  }

  function _reduceLeverageWithAmount(
    address _sAsset,
    address _stableAsset,
    uint256 _slippage,
    uint256 _assetLiquidationThreshold,
    uint256 _amount
  ) internal {
    // withdraw available collateral
    uint256 requireAmount = _amount;
    address variableDebtTokenAddress = LENDING_POOL
      .getReserveData(_stableAsset)
      .variableDebtTokenAddress;

    do {
      uint256 debtAmount = _getDebtAmount(variableDebtTokenAddress, msg.sender);
      if (debtAmount == 0) break;

      uint256 availableAmount = _getWithdrawalAmount(
        _sAsset,
        msg.sender,
        _assetLiquidationThreshold,
        WadRayMath.wad()
      );
      uint256 removeAmount = _amount != 0
        ? Math.min(availableAmount, requireAmount)
        : availableAmount;
      IERC20(_sAsset).safeTransferFrom(msg.sender, address(this), removeAmount);
      _remove(removeAmount, _slippage, msg.sender);

      // swap collateral to stable coin
      // in this case, some collateral asset maybe remained because of convex (ex: sUSD)
      uint256 stableAssetAmount = _swapFrom(_stableAsset);
      uint256 repayAmount = Math.min(debtAmount, stableAssetAmount);
      // repay
      _repay(_stableAsset, repayAmount, msg.sender);
      if (stableAssetAmount > repayAmount) {
        // swap stable coin to collateral in case of extra ramined stable coin after repay
        uint256 collateralAmount = _swapTo(
          _stableAsset,
          IERC20(_stableAsset).balanceOf(address(this))
        );
        _supply(collateralAmount, msg.sender);
        removeAmount -= collateralAmount;
      }

      // one time reduce leverage
      if (_amount == 0) break;

      requireAmount -= removeAmount;
      // completed the required amount to reduce leverage
      if (requireAmount == 0) break;
    } while (true);
  }

  function _supply(uint256 _amount, address _user) internal {
    // whitelist checking
    if (VAULT_WHITELIST.whitelistUserCount(VAULT) > 0) {
      require(VAULT_WHITELIST.whitelistUser(VAULT, _user), Errors.CALLER_NOT_WHITELIST_USER);
    }

    IGeneralVault(VAULT).depositCollateralFrom(COLLATERAL, _amount, _user);
  }

  function _remove(
    uint256 _amount,
    uint256 _slippage,
    address _user
  ) internal {
    // whitelist checking
    if (VAULT_WHITELIST.whitelistUserCount(VAULT) > 0) {
      require(VAULT_WHITELIST.whitelistUser(VAULT, _user), Errors.CALLER_NOT_WHITELIST_USER);
    }

    IGeneralVault(VAULT).withdrawCollateral(COLLATERAL, _amount, _slippage, address(this));
  }

  function _getWithdrawalAmount(
    address _sAsset,
    address _user,
    uint256 assetLiquidationThreshold,
    uint256 healthFactor
  ) internal view returns (uint256) {
    // get user info
    (
      uint256 totalCollateralETH,
      uint256 totalDebtETH,
      ,
      uint256 currentLiquidationThreshold,
      ,

    ) = LENDING_POOL.getUserAccountData(_user);

    uint256 withdrawalAmountETH = (((totalCollateralETH * currentLiquidationThreshold) /
      PercentageMath.PERCENTAGE_FACTOR -
      totalDebtETH.wadMul(healthFactor)) * PercentageMath.PERCENTAGE_FACTOR) /
      assetLiquidationThreshold;

    return
      Math.min(
        IERC20(_sAsset).balanceOf(_user),
        (withdrawalAmountETH * (10**DECIMALS)) / _getAssetPrice(COLLATERAL)
      );
  }

  function _getDebtAmount(address _variableDebtTokenAddress, address _user)
    internal
    view
    returns (uint256)
  {
    return IERC20(_variableDebtTokenAddress).balanceOf(_user);
  }

  function _borrow(
    address _stableAsset,
    uint256 _amount,
    address borrower
  ) internal {
    LENDING_POOL.borrow(_stableAsset, _amount, USE_VARIABLE_DEBT, 0, borrower);
  }

  function _repay(
    address _stableAsset,
    uint256 _amount,
    address borrower
  ) internal {
    IERC20(_stableAsset).safeApprove(address(LENDING_POOL), 0);
    IERC20(_stableAsset).safeApprove(address(LENDING_POOL), _amount);

    LENDING_POOL.repay(_stableAsset, _amount, USE_VARIABLE_DEBT, borrower);
  }

  function _calcBorrowableAmount(
    uint256 _collateralAmount,
    uint256 _ltv,
    address _borrowAsset,
    uint256 _assetDecimals
  ) internal view returns (uint256) {
    uint256 availableBorrowsETH = (_collateralAmount *
      _getAssetPrice(COLLATERAL).percentMul(_ltv)) / (10**DECIMALS);

    availableBorrowsETH = availableBorrowsETH > SAFE_BUFFER ? availableBorrowsETH - SAFE_BUFFER : 0;

    uint256 availableBorrowsAsset = (availableBorrowsETH * (10**_assetDecimals)) /
      _getAssetPrice(_borrowAsset);

    return availableBorrowsAsset;
  }

  function _swapTo(address, uint256) internal virtual returns (uint256) {
    return 0;
  }

  function _swapFrom(address) internal virtual returns (uint256) {
    return 0;
  }

  /**
   * @param _zappingAsset - The stable coin address which will zap into lp token
   * @param _principal - The amount of collateral
   */
  function zapDeposit(address _zappingAsset, uint256 _principal) external {
    require(_principal != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_zappingAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(
      IERC20(_zappingAsset).balanceOf(msg.sender) >= _principal,
      Errors.LS_SUPPLY_NOT_ALLOWED
    );

    IERC20(_zappingAsset).safeTransferFrom(msg.sender, address(this), _principal);

    uint256 suppliedAmount = _swapTo(_zappingAsset, _principal);
    // supply to LP
    _supply(suppliedAmount, msg.sender);
  }

  /**
   * @param _zappingAsset - The stable coin address which will zap into lp token
   * @param _principal - The amount of the stable coin
   * @param _iterations - Loop count
   * @param _ltv - The loan to value of the asset in 4 decimals ex. 82.5% == 8250
   * @param _borrowAsset - The borrowing stable asset address when leverage works
   */
  function zapLeverage(
    address _zappingAsset,
    uint256 _principal,
    uint256 _iterations,
    uint256 _ltv,
    address _borrowAsset
  ) external {
    require(_principal != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_zappingAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(ENABLED_STABLE_COINS[_borrowAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(
      IERC20(_zappingAsset).balanceOf(msg.sender) >= _principal,
      Errors.LS_SUPPLY_NOT_ALLOWED
    );

    IERC20(_zappingAsset).safeTransferFrom(msg.sender, address(this), _principal);

    uint256 amount = _swapTo(_zappingAsset, _principal);

    leverage(msg.sender, amount, _iterations, _ltv, _borrowAsset);
  }

  /**
   * @param _zappingAsset - The stable coin address which will zap into lp token
   * @param _principal - The amount of the stable coin
   * @param _leverage - Extra leverage value and must be greater than 0, ex. 300% = 300_00
   *                    principal + principal * leverage should be used as collateral
   * @param _slippage - Slippage valule to borrow enough asset by flashloan,
   *                    Must be greater than 0%.
   *                    Borrowing amount = principal * leverage * slippage
   * @param _borrowAsset - The borrowing stable coin address when leverage works
   */
  function zapLeverageWithFlashloan(
    address _zappingAsset,
    uint256 _principal,
    uint256 _leverage,
    uint256 _slippage,
    address _borrowAsset
  ) external {
    require(_principal != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_leverage != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(_slippage != 0, Errors.LS_SWAP_AMOUNT_NOT_GT_0);
    require(ENABLED_STABLE_COINS[_zappingAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(ENABLED_STABLE_COINS[_borrowAsset], Errors.LS_STABLE_COIN_NOT_SUPPORTED);
    require(
      IERC20(_zappingAsset).balanceOf(msg.sender) >= _principal,
      Errors.LS_SUPPLY_NOT_ALLOWED
    );

    IERC20(_zappingAsset).safeTransferFrom(msg.sender, address(this), _principal);

    uint256 collateralAmount = _swapTo(_zappingAsset, _principal);

    leverageWithFlashloan(msg.sender, collateralAmount, _leverage, _slippage, _borrowAsset);
  }

  function leverage(
    address _user,
    uint256 _principal,
    uint256 _iterations,
    uint256 _ltv,
    address _borrowAsset
  ) internal {
    _supply(_principal, _user);

    uint256 suppliedAmount = _principal;
    uint256 borrowAmount = 0;
    uint256 borrowAssetDecimals = IERC20Detailed(_borrowAsset).decimals();
    for (uint256 i; i < _iterations; ++i) {
      borrowAmount = _calcBorrowableAmount(suppliedAmount, _ltv, _borrowAsset, borrowAssetDecimals);
      if (borrowAmount != 0) {
        // borrow stable coin
        _borrow(_borrowAsset, borrowAmount, _user);
        // swap stable coin to collateral
        suppliedAmount = _swapTo(_borrowAsset, borrowAmount);
        // supply to LP
        _supply(suppliedAmount, _user);
      }
    }

    emit EnterPosition(_user, _principal, _iterations, _ltv, _borrowAsset);
  }

  function leverageWithFlashloan(
    address _user,
    uint256 _principal,
    uint256 _leverage,
    uint256 _slippage,
    address _borrowAsset
  ) internal {
    IAaveFlashLoan AAVE_LENDING_POOL = IAaveFlashLoan(AAVE_LENDING_POOL_ADDRESS);
    uint256 borrowAssetDecimals = IERC20Detailed(_borrowAsset).decimals();

    address[] memory assets = new address[](1);
    assets[0] = _borrowAsset;

    uint256[] memory amounts = new uint256[](1);
    amounts[0] = ((((_principal * _getAssetPrice(COLLATERAL)) / 10**DECIMALS) *
      10**borrowAssetDecimals) / _getAssetPrice(_borrowAsset)).percentMul(_leverage).percentMul(
        PercentageMath.PERCENTAGE_FACTOR + _slippage
      );

    // 0 means revert the transaction if not validated
    uint256[] memory modes = new uint256[](1);
    modes[0] = 0;

    uint256 minCollateralAmount = _principal.percentMul(
      PercentageMath.PERCENTAGE_FACTOR + _leverage
    );
    bytes memory params = abi.encode(
      true, /*enterPosition*/
      0,
      minCollateralAmount,
      _user,
      address(0)
    );

    AAVE_LENDING_POOL.flashLoan(address(this), assets, amounts, modes, address(this), params, 0);
  }
}

// File: contracts/dependencies/openzeppelin/contracts/IERC20.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// File: contracts/dependencies/openzeppelin/contracts/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import {IERC20} from './IERC20.sol';
import {Address} from './Address.sol';

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

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

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

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    require(
      (value == 0) || (token.allowance(address(this), spender) == 0),
      'SafeERC20: approve from non-zero to non-zero allowance'
    );
    callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
  }

  function callOptionalReturn(IERC20 token, bytes memory data) private {
    require(address(token).isContract(), 'SafeERC20: call to non-contract');

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = address(token).call(data);
    require(success, 'SafeERC20: low-level call failed');

    if (returndata.length != 0) {
      // Return data is optional
      // solhint-disable-next-line max-line-length
      require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed');
    }
  }
}

// File: contracts/protocol/libraries/swap/UniswapAdapter.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import {IERC20Detailed} from '../../../dependencies/openzeppelin/contracts/IERC20Detailed.sol';
import {IERC20} from '../../../dependencies/openzeppelin/contracts/IERC20.sol';
import {ISwapRouter} from '../../../interfaces/ISwapRouter.sol';
import {IPriceOracleGetter} from '../../../interfaces/IPriceOracleGetter.sol';
import {ILendingPoolAddressesProvider} from '../../../interfaces/ILendingPoolAddressesProvider.sol';
import {SafeERC20} from '../../../dependencies/openzeppelin/contracts/SafeERC20.sol';
import {PercentageMath} from '../../libraries/math/PercentageMath.sol';
import {Errors} from '../../libraries/helpers/Errors.sol';

library UniswapAdapter {
  using PercentageMath for uint256;
  using SafeERC20 for IERC20;

  struct Path {
    address[] tokens;
    uint256[] fees;
  }

  function swapExactTokensForTokens(
    ILendingPoolAddressesProvider addressesProvider,
    address assetToSwapFrom,
    address assetToSwapTo,
    uint256 amountToSwap,
    Path calldata path,
    uint256 slippage // 2% = 200
  ) external returns (uint256) {
    // Check path is valid
    uint256 length = path.tokens.length;
    require(length > 1 && length - 1 == path.fees.length, Errors.VT_SWAP_PATH_LENGTH_INVALID);
    require(
      path.tokens[0] == assetToSwapFrom && path.tokens[length - 1] == assetToSwapTo,
      Errors.VT_SWAP_PATH_TOKEN_INVALID
    );

    // Calculate expected amount of the outbound asset
    uint256 minAmountOut = _getMinAmount(
      addressesProvider,
      assetToSwapFrom,
      assetToSwapTo,
      amountToSwap,
      slippage
    );

    // Approves the transfer for the swap. Approves for 0 first to comply with tokens that implement the anti frontrunning approval fix.
    address UNISWAP_ROUTER = addressesProvider.getAddress('uniswapRouter');
    IERC20(assetToSwapFrom).safeApprove(address(UNISWAP_ROUTER), 0);
    IERC20(assetToSwapFrom).safeApprove(address(UNISWAP_ROUTER), amountToSwap);

    uint256 receivedAmount;
    if (length > 2) {
      bytes memory _path;

      for (uint256 i; i < length - 1; ++i) {
        _path = abi.encodePacked(_path, path.tokens[i], uint24(path.fees[i]));
      }
      _path = abi.encodePacked(_path, assetToSwapTo);

      ISwapRouter.ExactInputParams memory params = ISwapRouter.ExactInputParams({
        path: _path,
        recipient: address(this),
        deadline: block.timestamp,
        amountIn: amountToSwap,
        amountOutMinimum: minAmountOut
      });

      // Executes the swap.
      receivedAmount = ISwapRouter(UNISWAP_ROUTER).exactInput(params);
    } else {
      ISwapRouter.ExactInputSingleParams memory params = ISwapRouter.ExactInputSingleParams({
        tokenIn: assetToSwapFrom,
        tokenOut: assetToSwapTo,
        fee: uint24(path.fees[0]),
        recipient: address(this),
        deadline: block.timestamp,
        amountIn: amountToSwap,
        amountOutMinimum: minAmountOut,
        sqrtPriceLimitX96: 0
      });

      // Executes the swap.
      receivedAmount = ISwapRouter(UNISWAP_ROUTER).exactInputSingle(params);
    }

    require(receivedAmount != 0, Errors.VT_SWAP_MISMATCH_RETURNED_AMOUNT);
    require(
      IERC20(assetToSwapTo).balanceOf(address(this)) >= receivedAmount,
      Errors.VT_SWAP_MISMATCH_RETURNED_AMOUNT
    );

    return receivedAmount;
  }

  function _getDecimals(address asset) internal view returns (uint256) {
    return IERC20Detailed(asset).decimals();
  }

  function _getPrice(ILendingPoolAddressesProvider addressesProvider, address asset)
    internal
    view
    returns (uint256)
  {
    return IPriceOracleGetter(addressesProvider.getPriceOracle()).getAssetPrice(asset);
  }

  function _getMinAmount(
    ILendingPoolAddressesProvider addressesProvider,
    address assetToSwapFrom,
    address assetToSwapTo,
    uint256 amountToSwap,
    uint256 slippage
  ) internal view returns (uint256) {
    uint256 fromAssetDecimals = _getDecimals(assetToSwapFrom);
    uint256 toAssetDecimals = _getDecimals(assetToSwapTo);

    uint256 fromAssetPrice = _getPrice(addressesProvider, assetToSwapFrom);
    uint256 toAssetPrice = _getPrice(addressesProvider, assetToSwapTo);

    uint256 minAmountOut = ((amountToSwap * fromAssetPrice * 10**toAssetDecimals) /
      (toAssetPrice * 10**fromAssetDecimals)).percentMul(
        PercentageMath.PERCENTAGE_FACTOR - slippage
      );

    return minAmountOut;
  }
}

// File: contracts/dependencies/openzeppelin/contracts/IERC20Detailed.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

import {IERC20} from './IERC20.sol';

interface IERC20Detailed is IERC20 {
  function name() external view returns (string memory);

  function symbol() external view returns (string memory);

  function decimals() external view returns (uint8);
}

// File: contracts/interfaces/IPriceOracleGetter.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

/**
 * @title IPriceOracleGetter interface
 * @notice Interface for the Sturdy price oracle.
 **/

interface IPriceOracleGetter {
  /**
   * @dev returns the asset price in ETH
   * @param asset the address of the asset
   * @return the ETH price of the asset
   **/
  function getAssetPrice(address asset) external view returns (uint256);
}

// File: contracts/interfaces/ILendingPool.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import {ILendingPoolAddressesProvider} from './ILendingPoolAddressesProvider.sol';
import {DataTypes} from '../protocol/libraries/types/DataTypes.sol';

interface ILendingPool {
  /**
   * @dev Emitted on deposit()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address initiating the deposit
   * @param onBehalfOf The beneficiary of the deposit, receiving the aTokens
   * @param amount The amount deposited
   * @param referral The referral code used
   **/
  event Deposit(
    address indexed reserve,
    address user,
    address indexed onBehalfOf,
    uint256 amount,
    uint16 indexed referral
  );

  /**
   * @dev Emitted on withdraw()
   * @param reserve The address of the underlyng asset being withdrawn
   * @param user The address initiating the withdrawal, owner of aTokens
   * @param to Address that will receive the underlying
   * @param amount The amount to be withdrawn
   **/
  event Withdraw(address indexed reserve, address indexed user, address indexed to, uint256 amount);

  /**
   * @dev Emitted on borrow() and flashLoan() when debt needs to be opened
   * @param reserve The address of the underlying asset being borrowed
   * @param user The address of the user initiating the borrow(), receiving the funds on borrow() or just
   * initiator of the transaction on flashLoan()
   * @param onBehalfOf The address that will be getting the debt
   * @param amount The amount borrowed out
   * @param borrowRateMode The rate mode: 1 for Stable, 2 for Variable
   * @param borrowRate The numeric rate at which the user has borrowed
   * @param referral The referral code used
   **/
  event Borrow(
    address indexed reserve,
    address user,
    address indexed onBehalfOf,
    uint256 amount,
    uint256 borrowRateMode,
    uint256 borrowRate,
    uint16 indexed referral
  );

  /**
   * @dev Emitted on repay()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The beneficiary of the repayment, getting his debt reduced
   * @param repayer The address of the user initiating the repay(), providing the funds
   * @param amount The amount repaid
   **/
  event Repay(
    address indexed reserve,
    address indexed user,
    address indexed repayer,
    uint256 amount
  );

  /**
   * @dev Emitted on setUserUseReserveAsCollateral()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user enabling the usage as collateral
   **/
  event ReserveUsedAsCollateralEnabled(address indexed reserve, address indexed user);

  /**
   * @dev Emitted on setUserUseReserveAsCollateral()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user enabling the usage as collateral
   **/
  event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user);

  /**
   * @dev Emitted on flashLoan()
   * @param target The address of the flash loan receiver contract
   * @param initiator The address initiating the flash loan
   * @param asset The address of the asset being flash borrowed
   * @param amount The amount flash borrowed
   * @param premium The fee flash borrowed
   * @param referralCode The referral code used
   **/
  event FlashLoan(
    address indexed target,
    address indexed initiator,
    address indexed asset,
    uint256 amount,
    uint256 premium,
    uint16 referralCode
  );

  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();

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

  /**
   * @dev Emitted when a borrower is liquidated. This event is emitted by the LendingPool via
   * LendingPoolCollateral manager using a DELEGATECALL
   * This allows to have the events in the generated ABI for LendingPool.
   * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
   * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
   * @param user The address of the borrower getting liquidated
   * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
   * @param liquidatedCollateralAmount The amount of collateral received by the liiquidator
   * @param liquidator The address of the liquidator
   * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants
   * to receive the underlying collateral asset directly
   **/
  event LiquidationCall(
    address indexed collateralAsset,
    address indexed debtAsset,
    address indexed user,
    uint256 debtToCover,
    uint256 liquidatedCollateralAmount,
    address liquidator,
    bool receiveAToken
  );

  /**
   * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
   * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
   * the event will actually be fired by the LendingPool contract. The event is therefore replicated here so it
   * gets added to the LendingPool ABI
   * @param reserve The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param stableBorrowRate The new stable borrow rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed reserve,
    uint256 liquidityRate,
    uint256 stableBorrowRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );

  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying aTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 aUSDC
   * - Caller is anyone.
   * @param asset The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @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 deposit(
    address asset,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external;

  /**
   * @dev Deposits an `amount` of underlying asset into the reserve for supplier from vault
   * - Caller is only Vault which is registered in this contract
   * @param asset The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   **/
  function depositYield(address asset, uint256 amount) external;

  /**
   * @dev Grab an Yield `amount` of underlying asset into the vault
   * - Caller is only Vault which is registered in this contract
   * @param asset The address of the underlying asset to get yield
   * @param amount The yield amount
   **/
  function getYield(address asset, uint256 amount) external;

  /**
   * @dev Get underlying asset and aToken's total balance
   * @param asset The address of the underlying asset
   **/
  function getTotalBalanceOfAssetPair(address asset) external view returns (uint256, uint256);

  /**
   * @dev Get total underlying asset which is borrowable
   *  and also list of underlying asset
   **/
  function getBorrowingAssetAndVolumes()
    external
    view
    returns (
      uint256,
      uint256[] memory,
      address[] memory,
      uint256
    );

  /**
   * @dev Register the vault address
   * - To check if the caller is vault for some functions
   * - Caller is only LendingPoolConfigurator
   * @param _vaultAddress The address of the Vault
   **/
  function registerVault(address _vaultAddress) external payable;

  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned
   * - E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC
   * - Caller is anyone
   * @param asset The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole aToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdraw(
    address asset,
    uint256 amount,
    address to
  ) external returns (uint256);

  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned
   * - E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC
   * - Caller is anyone
   * @param asset The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole aToken balance
   * @param from The address of user who is depositor of underlying asset
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   * @return The final amount withdrawn
   **/
  function withdrawFrom(
    address asset,
    uint256 amount,
    address from,
    address to
  ) external returns (uint256);

  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral, or he was given enough allowance by a credit delegator on the
   * corresponding debt token (StableDebtToken or VariableDebtToken)
   * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
   *   and 100 stable/variable debt tokens, depending on the `interestRateMode`
   * - Caller is anyone
   * @param asset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param interestRateMode The interest rate mode at which the user wants to borrow: 1 for Stable, 2 for Variable
   * @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
   * @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   **/
  function borrow(
    address asset,
    uint256 amount,
    uint256 interestRateMode,
    uint16 referralCode,
    address onBehalfOf
  ) external;

  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
   * - E.g. User repays 100 USDC, burning 100 variable/stable debt tokens of the `onBehalfOf` address
   * - Caller is anyone
   * @param asset The address of the borrowed underlying asset previously borrowed
   * @param amount The amount to repay
   * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
   * @param rateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
   * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
   * user calling the function if he wants to reduce/remove his own debt, or the address of any other
   * other borrower whose debt should be removed
   * @return The final amount repaid
   **/
  function repay(
    address asset,
    uint256 amount,
    uint256 rateMode,
    address onBehalfOf
  ) external returns (uint256);

  /**
   * @dev Allows depositors to enable/disable a specific deposited asset as collateral
   * @param asset The address of the underlying asset deposited
   * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
   **/
  function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external;

  /**
   * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
   * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
   *   a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
   * - Caller is anyone
   * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
   * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
   * @param user The address of the borrower getting liquidated
   * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
   * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants
   * to receive the underlying collateral asset directly
   **/
  function liquidationCall(
    address collateralAsset,
    address debtAsset,
    address user,
    uint256 debtToCover,
    bool receiveAToken
  ) external;

  /**
   * @dev Returns the user account data across all the reserves
   * @param user The address of the user
   * @return totalCollateralETH the total collateral in ETH of the user
   * @return totalDebtETH the total debt in ETH of the user
   * @return availableBorrowsETH the borrowing power left of the user
   * @return currentLiquidationThreshold the liquidation threshold of the user
   * @return ltv the loan to value of the user
   * @return healthFactor the current health factor of the user
   **/
  function getUserAccountData(address user)
    external
    view
    returns (
      uint256 totalCollateralETH,
      uint256 totalDebtETH,
      uint256 availableBorrowsETH,
      uint256 currentLiquidationThreshold,
      uint256 ltv,
      uint256 healthFactor
    );

  /**
   * @dev Initializes a reserve, activating it, assigning an aToken and debt tokens and an
   * interest rate strategy
   * - Only callable by the LendingPoolConfigurator contract
   * - Caller is only LendingPoolConfigurator
   * @param reserve The address of the underlying asset of the reserve
   * @param yieldAddress The address of the underlying asset's yield contract of the reserve
   * @param aTokenAddress The address of the aToken that will be assigned to the reserve
   * @param stableDebtAddress The address of the StableDebtToken that will be assigned to the reserve
   * @param variableDebtAddress The address of the VariableDebtToken that will be assigned to the reserve
   * @param interestRateStrategyAddress The address of the interest rate strategy contract
   **/
  function initReserve(
    address reserve,
    address yieldAddress,
    address aTokenAddress,
    address stableDebtAddress,
    address variableDebtAddress,
    address interestRateStrategyAddress
  ) external payable;

  /**
   * @dev Updates the address of the interest rate strategy contract
   * - Caller is only LendingPoolConfigurator
   * @param reserve The address of the underlying asset of the reserve
   * @param rateStrategyAddress The address of the interest rate strategy contract
   **/
  function setReserveInterestRateStrategyAddress(address reserve, address rateStrategyAddress)
    external
    payable;

  /**
   * @dev Sets the configuration bitmap of the reserve as a whole
   * - Caller is only LendingPoolConfigurator
   * @param reserve The address of the underlying asset of the reserve
   * @param configuration The new configuration bitmap
   **/
  function setConfiguration(address reserve, uint256 configuration) external payable;

  /**
   * @dev Returns the configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The configuration of the reserve
   **/
  function getConfiguration(address asset)
    external
    view
    returns (DataTypes.ReserveConfigurationMap memory);

  /**
   * @dev Returns the configuration of the user across all the reserves
   * @param user The user address
   * @return The configuration of the user
   **/
  function getUserConfiguration(address user)
    external
    view
    returns (DataTypes.UserConfigurationMap memory);

  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view returns (uint256);

  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);

  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);

  /**
   * @dev Validates and finalizes an aToken transfer
   * - Only callable by the overlying aToken of the `asset`
   * - Caller is only aToken contract which is storing the underlying asset of depositors
   * @param asset The address of the underlying asset of the aToken
   * @param from The user from which the aTokens are transferred
   * @param to The user receiving the aTokens
   * @param amount The amount being transferred/withdrawn
   * @param balanceFromAfter The aToken balance of the `from` user before the transfer
   * @param balanceToBefore The aToken balance of the `to` user before the transfer
   */
  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromAfter,
    uint256 balanceToBefore
  ) external;

  /**
   * @dev Returns the list of the initialized reserves
   **/
  function getReservesList() external view returns (address[] memory);

  /**
   * @dev Returns the cached LendingPoolAddressesProvider connected to this contract
   **/
  function getAddressesProvider() external view returns (ILendingPoolAddressesProvider);

  /**
   * @dev Set the _pause state of a reserve
   * - Caller is only LendingPoolConfigurator
   * @param val `true` to pause the reserve, `false` to un-pause it
   */
  function setPause(bool val) external payable;

  /**
   * @dev Returns if the LendingPool is paused
   */
  function paused() external view returns (bool);
}

// File: contracts/interfaces/ILendingPoolAddressesProvider.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

/**
 * @title LendingPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Sturdy Governance
 * @author Sturdy, inspiration from Aave
 **/
interface ILendingPoolAddressesProvider {
  event MarketIdSet(string newMarketId);
  event LendingPoolUpdated(address indexed newAddress);
  event IncentiveControllerUpdated(address indexed newAddress);
  event IncentiveTokenUpdated(address indexed newAddress);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendingPoolConfiguratorUpdated(address indexed newAddress);
  event LendingPoolCollateralManagerUpdated(address indexed newAddress);
  event PriceOracleUpdated(address indexed newAddress);
  event LendingRateOracleUpdated(address indexed newAddress);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);

  function getMarketId() external view returns (string memory);

  function setMarketId(string calldata marketId) external payable;

  function setAddress(bytes32 id, address newAddress) external payable;

  function setAddressAsProxy(bytes32 id, address impl) external payable;

  function getAddress(bytes32 id) external view returns (address);

  function getLendingPool() external view returns (address);

  function setLendingPoolImpl(address pool) external payable;

  function getIncentiveController() external view returns (address);

  function setIncentiveControllerImpl(address incentiveController) external payable;

  function getIncentiveToken() external view returns (address);

  function setIncentiveTokenImpl(address incentiveToken) external payable;

  function getLendingPoolConfigurator() external view returns (address);

  function setLendingPoolConfiguratorImpl(address configurator) external payable;

  function getLendingPoolCollateralManager() external view returns (address);

  function setLendingPoolCollateralManager(address manager) external payable;

  function getPoolAdmin() external view returns (address);

  function setPoolAdmin(address admin) external payable;

  function getEmergencyAdmin() external view returns (address);

  function setEmergencyAdmin(address admin) external payable;

  function getPriceOracle() external view returns (address);

  function setPriceOracle(address priceOracle) external payable;

  function getLendingRateOracle() external view returns (address);

  function setLendingRateOracle(address lendingRateOracle) external payable;
}

// File: contracts/protocol/libraries/math/PercentageMath.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

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

/**
 * @title PercentageMath library
 * @author Sturdy, inspiration from 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;
    }

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

  /**
   * @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) {
    uint256 halfPercentage = percentage / 2;

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

// File: contracts/interfaces/IGeneralVault.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

interface IGeneralVault {
  function pricePerShare() external view returns (uint256);

  function vaultYieldInPrice() external view returns (uint256);

  function withdrawOnLiquidation(address _asset, uint256 _amount) external returns (uint256);

  function convertOnLiquidation(address _assetOut, uint256 _amountIn) external;

  function processYield() external;

  function getYieldAmount() external view returns (uint256);

  function setTreasuryInfo(address _treasury, uint256 _fee) external;

  function depositCollateral(address _asset, uint256 _amount) external payable;

  function depositCollateralFrom(
    address _asset,
    uint256 _amount,
    address _user
  ) external payable;

  function withdrawCollateral(
    address _asset,
    uint256 _amount,
    uint256 _slippage,
    address _to
  ) external;
}

// File: contracts/interfaces/IAToken.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';
import {IScaledBalanceToken} from './IScaledBalanceToken.sol';
import {IInitializableAToken} from './IInitializableAToken.sol';
import {ISturdyIncentivesController} from './ISturdyIncentivesController.sol';

interface IAToken is IERC20, IScaledBalanceToken, IInitializableAToken {
  /**
   * @dev Emitted after the mint action
   * @param from The address performing the mint
   * @param value The amount being
   * @param index The new liquidity index of the reserve
   **/
  event Mint(address indexed from, uint256 value, uint256 index);

  /**
   * @dev Mints `amount` aTokens to `user`
   * @param user The address receiving the minted tokens
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   * @return `true` if the the previous balance of the user was 0
   */
  function mint(
    address user,
    uint256 amount,
    uint256 index
  ) external payable returns (bool);

  /**
   * @dev Emitted after aTokens are burned
   * @param from The owner of the aTokens, getting them burned
   * @param target The address that will receive the underlying
   * @param value The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  event Burn(address indexed from, address indexed target, uint256 value, uint256 index);

  /**
   * @dev Emitted during the transfer action
   * @param from The user whose tokens are being transferred
   * @param to The recipient
   * @param value The amount being transferred
   * @param index The new liquidity index of the reserve
   **/
  event BalanceTransfer(address indexed from, address indexed to, uint256 value, uint256 index);

  /**
   * @dev Burns aTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
   * @param user The owner of the aTokens, getting them burned
   * @param receiverOfUnderlying The address that will receive the underlying
   * @param amount The amount being burned
   * @param index The new liquidity index of the reserve
   **/
  function burn(
    address user,
    address receiverOfUnderlying,
    uint256 amount,
    uint256 index
  ) external payable;

  /**
   * @dev Mints aTokens to the reserve treasury
   * @param amount The amount of tokens getting minted
   * @param index The new liquidity index of the reserve
   */
  function mintToTreasury(uint256 amount, uint256 index) external payable;

  /**
   * @dev Transfers aTokens in the event of a borrow being liquidated, in case the liquidators reclaims the aToken
   * @param from The address getting liquidated, current owner of the aTokens
   * @param to The recipient
   * @param value The amount of tokens getting transferred
   **/
  function transferOnLiquidation(
    address from,
    address to,
    uint256 value
  ) external payable;

  /**
   * @dev Transfers the underlying asset to `target`. Used by the LendingPool to transfer
   * assets in borrow(), withdraw() and flashLoan()
   * @param user The recipient of the underlying
   * @param amount The amount getting transferred
   * @return The amount transferred
   **/
  function transferUnderlyingTo(address user, uint256 amount) external payable returns (uint256);

  /**
   * @dev Invoked to execute actions on the aToken side after a repayment.
   * @param user The user executing the repayment
   * @param amount The amount getting repaid
   **/
  function handleRepayment(address user, uint256 amount) external;

  /**
   * @dev Returns the address of the incentives controller contract
   **/
  function getIncentivesController() external view returns (ISturdyIncentivesController);

  /**
   * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH)
   **/
  function UNDERLYING_ASSET_ADDRESS() external view returns (address);
}

// File: contracts/flashloan/interfaces/IFlashLoanReceiver.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

/**
 * @title IFlashLoanReceiver interface
 * @notice Interface for the IFlashLoanReceiver.
 * @author Sturdy
 * @dev implement this interface to develop a flashloan-compatible flashLoanReceiver contract
 **/
interface IFlashLoanReceiver {
  function executeOperation(
    address[] calldata assets,
    uint256[] calldata amounts,
    uint256[] calldata premiums,
    address initiator,
    bytes calldata params
  ) external returns (bool);
}

// File: contracts/interfaces/IVaultWhitelist.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

interface IVaultWhitelist {
  function whitelistUser(address vault, address user) external view returns (bool);

  function whitelistUserCount(address vault) external view returns (uint256);

  function whitelistContract(address vault, address sender) external view returns (bool);
}

// File: contracts/interfaces/IAaveFlashLoan.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

interface IAaveFlashLoan {
  /**
   * @dev Allows smartcontracts to access the liquidity of the pool within one transaction,
   * as long as the amount taken plus a fee is returned.
   * IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept into consideration.
   * For further details please visit https://developers.aave.com
   * @param receiverAddress The address of the contract receiving the funds, implementing the IFlashLoanReceiver interface
   * @param assets The addresses of the assets being flash-borrowed
   * @param amounts The amounts amounts being flash-borrowed
   * @param modes Types of the debt to open if the flash loan is not returned:
   *   0 -> Don't open any debt, just revert if funds can't be transferred from the receiver
   *   1 -> Open debt at stable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
   *   2 -> Open debt at variable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
   * @param onBehalfOf The address  that will receive the debt in the case of using on `modes` 1 or 2
   * @param params Variadic packed params to pass to the receiver as extra information
   * @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 flashLoan(
    address receiverAddress,
    address[] calldata assets,
    uint256[] calldata amounts,
    uint256[] calldata modes,
    address onBehalfOf,
    bytes calldata params,
    uint16 referralCode
  ) external;
}

// File: contracts/protocol/libraries/types/DataTypes.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

library DataTypes {
  // refer to the whitepaper, section 1.1 basic concepts for a formal description of these properties.
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    //the current stable borrow rate. Expressed in ray
    uint128 currentStableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address aTokenAddress;
    address stableDebtTokenAddress;
    address variableDebtTokenAddress;
    //address of the interest rate strategy
    address interestRateStrategyAddress;
    //address of the yield contract
    address yieldAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }

  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }

  struct UserConfigurationMap {
    uint256 data;
  }

  enum InterestRateMode {
    NONE,
    STABLE,
    VARIABLE
  }
}

// File: contracts/protocol/libraries/configuration/ReserveConfiguration.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

import {Errors} from '../helpers/Errors.sol';
import {DataTypes} from '../types/DataTypes.sol';

/**
 * @title ReserveConfiguration library
 * @author Sturdy, inspiration from Aave
 * @notice Implements the bitmap logic to handle the reserve configuration
 */
library ReserveConfiguration {
  uint256 constant LTV_MASK =                   0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000; // prettier-ignore
  uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFF; // prettier-ignore
  uint256 constant LIQUIDATION_BONUS_MASK =     0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFF; // prettier-ignore
  uint256 constant DECIMALS_MASK =              0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00FFFFFFFFFFFF; // prettier-ignore
  uint256 constant ACTIVE_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant FROZEN_MASK =                0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant BORROWING_MASK =             0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant STABLE_BORROWING_MASK =      0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant RESERVE_FACTOR_MASK =        0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0000FFFFFFFFFFFFFFFF; // prettier-ignore
  uint256 constant COLLATERAL_MASK =            0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFF; // prettier-ignore

  /// @dev For the LTV, the start bit is 0 (up to 15), hence no bitshifting is needed
  uint256 constant LIQUIDATION_THRESHOLD_START_BIT_POSITION = 16;
  uint256 constant LIQUIDATION_BONUS_START_BIT_POSITION = 32;
  uint256 constant RESERVE_DECIMALS_START_BIT_POSITION = 48;
  uint256 constant IS_ACTIVE_START_BIT_POSITION = 56;
  uint256 constant IS_FROZEN_START_BIT_POSITION = 57;
  uint256 constant BORROWING_ENABLED_START_BIT_POSITION = 58;
  uint256 constant STABLE_BORROWING_ENABLED_START_BIT_POSITION = 59;
  uint256 constant COLLATERAL_ENABLED_START_BIT_POSITION = 60;
  uint256 constant RESERVE_FACTOR_START_BIT_POSITION = 64;

  uint256 constant MAX_VALID_LTV = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_THRESHOLD = 65535;
  uint256 constant MAX_VALID_LIQUIDATION_BONUS = 65535;
  uint256 constant MAX_VALID_DECIMALS = 255;
  uint256 constant MAX_VALID_RESERVE_FACTOR = 65535;

  /**
   * @dev Sets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @param ltv the new ltv
   **/
  function setLtv(DataTypes.ReserveConfigurationMap memory self, uint256 ltv) internal pure {
    require(ltv <= MAX_VALID_LTV, Errors.RC_INVALID_LTV);

    self.data = (self.data & LTV_MASK) | ltv;
  }

  /**
   * @dev Gets the Loan to Value of the reserve
   * @param self The reserve configuration
   * @return The loan to value
   **/
  function getLtv(DataTypes.ReserveConfigurationMap storage self) internal view returns (uint256) {
    return self.data & ~LTV_MASK;
  }

  /**
   * @dev Sets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @param threshold The new liquidation threshold
   **/
  function setLiquidationThreshold(DataTypes.ReserveConfigurationMap memory self, uint256 threshold)
    internal
    pure
  {
    require(threshold <= MAX_VALID_LIQUIDATION_THRESHOLD, Errors.RC_INVALID_LIQ_THRESHOLD);

    self.data =
      (self.data & LIQUIDATION_THRESHOLD_MASK) |
      (threshold << LIQUIDATION_THRESHOLD_START_BIT_POSITION);
  }

  /**
   * @dev Gets the liquidation threshold of the reserve
   * @param self The reserve configuration
   * @return The liquidation threshold
   **/
  function getLiquidationThreshold(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (uint256)
  {
    return (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION;
  }

  /**
   * @dev Sets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @param bonus The new liquidation bonus
   **/
  function setLiquidationBonus(DataTypes.ReserveConfigurationMap memory self, uint256 bonus)
    internal
    pure
  {
    require(bonus <= MAX_VALID_LIQUIDATION_BONUS, Errors.RC_INVALID_LIQ_BONUS);

    self.data =
      (self.data & LIQUIDATION_BONUS_MASK) |
      (bonus << LIQUIDATION_BONUS_START_BIT_POSITION);
  }

  /**
   * @dev Gets the liquidation bonus of the reserve
   * @param self The reserve configuration
   * @return The liquidation bonus
   **/
  function getLiquidationBonus(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (uint256)
  {
    return (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION;
  }

  /**
   * @dev Sets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @param decimals The decimals
   **/
  function setDecimals(DataTypes.ReserveConfigurationMap memory self, uint256 decimals)
    internal
    pure
  {
    require(decimals <= MAX_VALID_DECIMALS, Errors.RC_INVALID_DECIMALS);

    self.data = (self.data & DECIMALS_MASK) | (decimals << RESERVE_DECIMALS_START_BIT_POSITION);
  }

  /**
   * @dev Gets the decimals of the underlying asset of the reserve
   * @param self The reserve configuration
   * @return The decimals of the asset
   **/
  function getDecimals(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (uint256)
  {
    return (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION;
  }

  /**
   * @dev Sets the active state of the reserve
   * @param self The reserve configuration
   * @param active The active state
   **/
  function setActive(DataTypes.ReserveConfigurationMap memory self, bool active) internal pure {
    self.data =
      (self.data & ACTIVE_MASK) |
      (uint256(active ? 1 : 0) << IS_ACTIVE_START_BIT_POSITION);
  }

  /**
   * @dev Gets the active state of the reserve
   * @param self The reserve configuration
   * @return The active state
   **/
  function getActive(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~ACTIVE_MASK) != 0;
  }

  /**
   * @dev Sets the frozen state of the reserve
   * @param self The reserve configuration
   * @param frozen The frozen state
   **/
  function setFrozen(DataTypes.ReserveConfigurationMap memory self, bool frozen) internal pure {
    self.data =
      (self.data & FROZEN_MASK) |
      (uint256(frozen ? 1 : 0) << IS_FROZEN_START_BIT_POSITION);
  }

  /**
   * @dev Gets the frozen state of the reserve
   * @param self The reserve configuration
   * @return The frozen state
   **/
  function getFrozen(DataTypes.ReserveConfigurationMap storage self) internal view returns (bool) {
    return (self.data & ~FROZEN_MASK) != 0;
  }

  /**
   * @dev Enables or disables borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the borrowing needs to be enabled, false otherwise
   **/
  function setBorrowingEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled)
    internal
    pure
  {
    self.data =
      (self.data & BORROWING_MASK) |
      (uint256(enabled ? 1 : 0) << BORROWING_ENABLED_START_BIT_POSITION);
  }

  /**
   * @dev Gets the borrowing state of the reserve
   * @param self The reserve configuration
   * @return The borrowing state
   **/
  function getBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (bool)
  {
    return (self.data & ~BORROWING_MASK) != 0;
  }

  /**
   * @dev Sets the collateral state of the reserve
   * @param self The reserve configuration
   * @param enabled The collateral state
   **/
  function setCollateralEnabled(DataTypes.ReserveConfigurationMap memory self, bool enabled)
    internal
    pure
  {
    self.data =
      (self.data & COLLATERAL_MASK) |
      (uint256(enabled ? 1 : 0) << COLLATERAL_ENABLED_START_BIT_POSITION);
  }

  /**
   * @dev Gets the collateral state of the reserve
   * @param self The reserve configuration
   * @return The collateral state
   **/
  function getCollateralEnabled(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (bool)
  {
    return (self.data & ~COLLATERAL_MASK) != 0;
  }

  /**
   * @dev Enables or disables stable rate borrowing on the reserve
   * @param self The reserve configuration
   * @param enabled True if the stable rate borrowing needs to be enabled, false otherwise
   **/
  function setStableRateBorrowingEnabled(
    DataTypes.ReserveConfigurationMap memory self,
    bool enabled
  ) internal pure {
    self.data =
      (self.data & STABLE_BORROWING_MASK) |
      (uint256(enabled ? 1 : 0) << STABLE_BORROWING_ENABLED_START_BIT_POSITION);
  }

  /**
   * @dev Gets the stable rate borrowing state of the reserve
   * @param self The reserve configuration
   * @return The stable rate borrowing state
   **/
  function getStableRateBorrowingEnabled(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (bool)
  {
    return (self.data & ~STABLE_BORROWING_MASK) != 0;
  }

  /**
   * @dev Sets the reserve factor of the reserve
   * @param self The reserve configuration
   * @param reserveFactor The reserve factor
   **/
  function setReserveFactor(DataTypes.ReserveConfigurationMap memory self, uint256 reserveFactor)
    internal
    pure
  {
    require(reserveFactor <= MAX_VALID_RESERVE_FACTOR, Errors.RC_INVALID_RESERVE_FACTOR);

    self.data =
      (self.data & RESERVE_FACTOR_MASK) |
      (reserveFactor << RESERVE_FACTOR_START_BIT_POSITION);
  }

  /**
   * @dev Gets the reserve factor of the reserve
   * @param self The reserve configuration
   * @return The reserve factor
   **/
  function getReserveFactor(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (uint256)
  {
    return (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION;
  }

  /**
   * @dev Gets the configuration flags of the reserve
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled, collateral enabled
   **/
  function getFlags(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      bool,
      bool,
      bool,
      bool,
      bool
    )
  {
    uint256 dataLocal = self.data;

    return (
      (dataLocal & ~ACTIVE_MASK) != 0,
      (dataLocal & ~FROZEN_MASK) != 0,
      (dataLocal & ~BORROWING_MASK) != 0,
      (dataLocal & ~STABLE_BORROWING_MASK) != 0,
      (dataLocal & ~COLLATERAL_MASK) != 0
    );
  }

  /**
   * @dev Gets the configuration paramters of the reserve
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParams(DataTypes.ReserveConfigurationMap storage self)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    uint256 dataLocal = self.data;

    return (
      dataLocal & ~LTV_MASK,
      (dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (dataLocal & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (dataLocal & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (dataLocal & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }

  /**
   * @dev Gets the configuration paramters of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
   **/
  function getParamsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      uint256,
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      self.data & ~LTV_MASK,
      (self.data & ~LIQUIDATION_THRESHOLD_MASK) >> LIQUIDATION_THRESHOLD_START_BIT_POSITION,
      (self.data & ~LIQUIDATION_BONUS_MASK) >> LIQUIDATION_BONUS_START_BIT_POSITION,
      (self.data & ~DECIMALS_MASK) >> RESERVE_DECIMALS_START_BIT_POSITION,
      (self.data & ~RESERVE_FACTOR_MASK) >> RESERVE_FACTOR_START_BIT_POSITION
    );
  }

  /**
   * @dev Gets the configuration flags of the reserve from a memory object
   * @param self The reserve configuration
   * @return The state flags representing active, frozen, borrowing enabled, stableRateBorrowing enabled, collateral enabled
   **/
  function getFlagsMemory(DataTypes.ReserveConfigurationMap memory self)
    internal
    pure
    returns (
      bool,
      bool,
      bool,
      bool,
      bool
    )
  {
    return (
      (self.data & ~ACTIVE_MASK) != 0,
      (self.data & ~FROZEN_MASK) != 0,
      (self.data & ~BORROWING_MASK) != 0,
      (self.data & ~STABLE_BORROWING_MASK) != 0,
      (self.data & ~COLLATERAL_MASK) != 0
    );
  }
}

// File: contracts/dependencies/openzeppelin/contracts/Math.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

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

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

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

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

// File: contracts/protocol/libraries/math/WadRayMath.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

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

/**
 * @title WadRayMath library
 * @author Sturdy, inspiration from Aave
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 **/

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

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

  uint256 internal constant WAD_RAY_RATIO = 1e9;

  /**
   * @return One ray, 1e27
   **/
  function ray() internal pure returns (uint256) {
    return RAY;
  }

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

  function wad() internal pure returns (uint256) {
    return WAD;
  }

  /**
   * @return Half ray, 1e27/2
   **/
  function halfRay() internal pure returns (uint256) {
    return halfRAY;
  }

  /**
   * @return Half ray, 1e18/2
   **/
  function halfWad() internal pure returns (uint256) {
    return halfWAD;
  }

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

    return (a * b + halfWAD) / WAD;
  }

  /**
   * @dev Divides two wad, rounding half up to the nearest wad
   * @param a Wad
   * @param b Wad
   * @return The result of a/b, in wad
   **/
  function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 halfB = b / 2;

    return (a * WAD + halfB) / b;
  }

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

    return (a * b + halfRAY) / RAY;
  }

  /**
   * @dev Divides two ray, rounding half up to the nearest ray
   * @param a Ray
   * @param b Ray
   * @return The result of a/b, in ray
   **/
  function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 halfB = b / 2;

    return (a * RAY + halfB) / b;
  }

  /**
   * @dev Casts ray down to wad
   * @param a Ray
   * @return a casted to wad, rounded half up to the nearest wad
   **/
  function rayToWad(uint256 a) internal pure returns (uint256) {
    uint256 halfRatio = WAD_RAY_RATIO / 2;
    uint256 result = halfRatio + a;

    return result / WAD_RAY_RATIO;
  }

  /**
   * @dev Converts wad up to ray
   * @param a Wad
   * @return a converted in ray
   **/
  function wadToRay(uint256 a) internal pure returns (uint256) {
    uint256 result = a * WAD_RAY_RATIO;

    return result;
  }
}

// File: contracts/protocol/libraries/helpers/Errors.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

/**
 * @title Errors library
 * @author Sturdy, inspiration from Aave
 * @notice Defines the error messages emitted by the different contracts of the Sturdy protocol
 * @dev Error messages prefix glossary:
 *  - VL = ValidationLogic
 *  - MATH = Math libraries
 *  - CT = Common errors between tokens (AToken, VariableDebtToken and StableDebtToken)
 *  - AT = AToken
 *  - SDT = StableDebtToken
 *  - VDT = VariableDebtToken
 *  - LP = LendingPool
 *  - LPAPR = LendingPoolAddressesProviderRegistry
 *  - LPC = LendingPoolConfiguration
 *  - RL = ReserveLogic
 *  - LPCM = LendingPoolCollateralManager
 *  - P = Pausable
 */
library Errors {
  //common errors
  string internal constant CALLER_NOT_POOL_ADMIN = '33'; // 'The caller must be the pool admin'
  string internal constant BORROW_ALLOWANCE_NOT_ENOUGH = '59'; // User borrows on behalf, but allowance are too small

  //contract specific errors
  string internal constant VL_INVALID_AMOUNT = '1'; // 'Amount must be greater than 0'
  string internal constant VL_NO_ACTIVE_RESERVE = '2'; // 'Action requires an active reserve'
  string internal constant VL_RESERVE_FROZEN = '3'; // 'Action cannot be performed because the reserve is frozen'
  string internal constant VL_CURRENT_AVAILABLE_LIQUIDITY_NOT_ENOUGH = '4'; // 'The current liquidity is not enough'
  string internal constant VL_NOT_ENOUGH_AVAILABLE_USER_BALANCE = '5'; // 'User cannot withdraw more than the available balance'
  string internal constant VL_TRANSFER_NOT_ALLOWED = '6'; // 'Transfer cannot be allowed.'
  string internal constant VL_BORROWING_NOT_ENABLED = '7'; // 'Borrowing is not enabled'
  string internal constant VL_INVALID_INTEREST_RATE_MODE_SELECTED = '8'; // 'Invalid interest rate mode selected'
  string internal constant VL_COLLATERAL_BALANCE_IS_0 = '9'; // 'The collateral balance is 0'
  string internal constant VL_HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = '10'; // 'Health factor is lesser than the liquidation threshold'
  string internal constant VL_COLLATERAL_CANNOT_COVER_NEW_BORROW = '11'; // 'There is not enough collateral to cover a new borrow'
  string internal constant VL_STABLE_BORROWING_NOT_ENABLED = '12'; // stable borrowing not enabled
  string internal constant VL_COLLATERAL_SAME_AS_BORROWING_CURRENCY = '13'; // collateral is (mostly) the same currency that is being borrowed
  string internal constant VL_AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE = '14'; // 'The requested amount is greater than the max loan size in stable rate mode
  string internal constant VL_NO_DEBT_OF_SELECTED_TYPE = '15'; // 'for repayment of stable debt, the user needs to have stable debt, otherwise, he needs to have variable debt'
  string internal constant VL_NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = '16'; // 'To repay on behalf of an user an explicit amount to repay is needed'
  string internal constant VL_NO_STABLE_RATE_LOAN_IN_RESERVE = '17'; // 'User does not have a stable rate loan in progress on this reserve'
  string internal constant VL_NO_VARIABLE_RATE_LOAN_IN_RESERVE = '18'; // 'User does not have a variable rate loan in progress on this reserve'
  string internal constant VL_UNDERLYING_BALANCE_NOT_GREATER_THAN_0 = '19'; // 'The underlying balance needs to be greater than 0'
  string internal constant VL_DEPOSIT_ALREADY_IN_USE = '20'; // 'User deposit is already being used as collateral'
  string internal constant LP_NOT_ENOUGH_STABLE_BORROW_BALANCE = '21'; // 'User does not have any stable rate loan for this reserve'
  string internal constant LP_INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = '22'; // 'Interest rate rebalance conditions were not met'
  string internal constant LP_LIQUIDATION_CALL_FAILED = '23'; // 'Liquidation call failed'
  string internal constant LP_NOT_ENOUGH_LIQUIDITY_TO_BORROW = '24'; // 'There is not enough liquidity available to borrow'
  string internal constant LP_REQUESTED_AMOUNT_TOO_SMALL = '25'; // 'The requested amount is too small for a FlashLoan.'
  string internal constant LP_INCONSISTENT_PROTOCOL_ACTUAL_BALANCE = '26'; // 'The actual balance of the protocol is inconsistent'
  string internal constant LP_CALLER_NOT_LENDING_POOL_CONFIGURATOR = '27'; // 'The caller of the function is not the lending pool configurator'
  string internal constant LP_INCONSISTENT_FLASHLOAN_PARAMS = '28';
  string internal constant CT_CALLER_MUST_BE_LENDING_POOL = '29'; // 'The caller of this function must be a lending pool'
  string internal constant CT_CANNOT_GIVE_ALLOWANCE_TO_HIMSELF = '30'; // 'User cannot give allowance to himself'
  string internal constant CT_TRANSFER_AMOUNT_NOT_GT_0 = '31'; // 'Transferred amount needs to be greater than zero'
  string internal constant RL_RESERVE_ALREADY_INITIALIZED = '32'; // 'Reserve has already been initialized'
  string internal constant LPC_RESERVE_LIQUIDITY_NOT_0 = '34'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_ATOKEN_POOL_ADDRESS = '35'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_STABLE_DEBT_TOKEN_POOL_ADDRESS = '36'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_VARIABLE_DEBT_TOKEN_POOL_ADDRESS = '37'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_STABLE_DEBT_TOKEN_UNDERLYING_ADDRESS = '38'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_VARIABLE_DEBT_TOKEN_UNDERLYING_ADDRESS = '39'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_ADDRESSES_PROVIDER_ID = '40'; // 'The liquidity of the reserve needs to be 0'
  string internal constant LPC_INVALID_CONFIGURATION = '75'; // 'Invalid risk parameters for the reserve'
  string internal constant LPC_CALLER_NOT_EMERGENCY_ADMIN = '76'; // 'The caller must be the emergency admin'
  string internal constant LPAPR_PROVIDER_NOT_REGISTERED = '41'; // 'Provider is not registered'
  string internal constant LPCM_HEALTH_FACTOR_NOT_BELOW_THRESHOLD = '42'; // 'Health factor is not below the threshold'
  string internal constant LPCM_COLLATERAL_CANNOT_BE_LIQUIDATED = '43'; // 'The collateral chosen cannot be liquidated'
  string internal constant LPCM_SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = '44'; // 'User did not borrow the specified currency'
  string internal constant LPCM_NOT_ENOUGH_LIQUIDITY_TO_LIQUIDATE = '45'; // "There isn't enough liquidity available to liquidate"
  string internal constant LPCM_NO_ERRORS = '46'; // 'No errors'
  string internal constant LP_INVALID_FLASHLOAN_MODE = '47'; //Invalid flashloan mode selected
  string internal constant MATH_MULTIPLICATION_OVERFLOW = '48';
  string internal constant MATH_ADDITION_OVERFLOW = '49';
  string internal constant MATH_DIVISION_BY_ZERO = '50';
  string internal constant RL_LIQUIDITY_INDEX_OVERFLOW = '51'; //  Liquidity index overflows uint128
  string internal constant RL_VARIABLE_BORROW_INDEX_OVERFLOW = '52'; //  Variable borrow index overflows uint128
  string internal constant RL_LIQUIDITY_RATE_OVERFLOW = '53'; //  Liquidity rate overflows uint128
  string internal constant RL_VARIABLE_BORROW_RATE_OVERFLOW = '54'; //  Variable borrow rate overflows uint128
  string internal constant RL_STABLE_BORROW_RATE_OVERFLOW = '55'; //  Stable borrow rate overflows uint128
  string internal constant CT_INVALID_MINT_AMOUNT = '56'; //invalid amount to mint
  string internal constant LP_FAILED_REPAY_WITH_COLLATERAL = '57';
  string internal constant CT_INVALID_BURN_AMOUNT = '58'; //invalid amount to burn
  string internal constant LP_FAILED_COLLATERAL_SWAP = '60';
  string internal constant LP_INVALID_EQUAL_ASSETS_TO_SWAP = '61';
  string internal constant LP_REENTRANCY_NOT_ALLOWED = '62';
  string internal constant LP_CALLER_MUST_BE_AN_ATOKEN = '63';
  string internal constant LP_IS_PAUSED = '64'; // 'Pool is paused'
  string internal constant LP_NO_MORE_RESERVES_ALLOWED = '65';
  string internal constant LP_INVALID_FLASH_LOAN_EXECUTOR_RETURN = '66';
  string internal constant RC_INVALID_LTV = '67';
  string internal constant RC_INVALID_LIQ_THRESHOLD = '68';
  string internal constant RC_INVALID_LIQ_BONUS = '69';
  string internal constant RC_INVALID_DECIMALS = '70';
  string internal constant RC_INVALID_RESERVE_FACTOR = '71';
  string internal constant LPAPR_INVALID_ADDRESSES_PROVIDER_ID = '72';
  string internal constant VL_INCONSISTENT_FLASHLOAN_PARAMS = '73';
  string internal constant LP_INCONSISTENT_PARAMS_LENGTH = '74';
  string internal constant UL_INVALID_INDEX = '77';
  string internal constant LP_NOT_CONTRACT = '78';
  string internal constant SDT_STABLE_DEBT_OVERFLOW = '79';
  string internal constant SDT_BURN_EXCEEDS_BALANCE = '80';
  string internal constant VT_COLLATERAL_DEPOSIT_REQUIRE_ETH = '81'; //Only accept ETH for collateral deposit
  string internal constant VT_COLLATERAL_DEPOSIT_INVALID = '82'; //Collateral deposit failed
  string internal constant VT_LIQUIDITY_DEPOSIT_INVALID = '83'; //Only accept USDC, USDT, DAI for liquidity deposit
  string internal constant VT_COLLATERAL_WITHDRAW_INVALID = '84'; //Collateral withdraw failed
  string internal constant VT_COLLATERAL_WITHDRAW_INVALID_AMOUNT = '85'; //Collateral withdraw has not enough amount
  string internal constant VT_CONVERT_ASSET_BY_CURVE_INVALID = '86'; //Convert asset by curve invalid
  string internal constant VT_PROCESS_YIELD_INVALID = '87'; //Processing yield is invalid
  string internal constant VT_TREASURY_INVALID = '88'; //Treasury is invalid
  string internal constant LP_ATOKEN_INIT_INVALID = '89'; //aToken invalid init
  string internal constant VT_FEE_TOO_BIG = '90'; //Fee is too big
  string internal constant VT_COLLATERAL_DEPOSIT_VAULT_UNAVAILABLE = '91';
  string internal constant LP_LIQUIDATION_CONVERT_FAILED = '92';
  string internal constant VT_DEPLOY_FAILED = '93'; // Vault deploy failed
  string internal constant VT_INVALID_CONFIGURATION = '94'; // Invalid vault configuration
  string internal constant VL_OVERFLOW_MAX_RESERVE_CAPACITY = '95'; // overflow max capacity of reserve
  string internal constant VT_WITHDRAW_AMOUNT_MISMATCH = '96'; // not performed withdraw 100%
  string internal constant VT_SWAP_MISMATCH_RETURNED_AMOUNT = '97'; //Returned amount is not enough
  string internal constant CALLER_NOT_YIELD_PROCESSOR = '98'; // 'The caller must be the pool admin'
  string internal constant VT_EXTRA_REWARDS_INDEX_INVALID = '99'; // Invalid extraRewards index
  string internal constant VT_SWAP_PATH_LENGTH_INVALID = '100'; // Invalid token or fee length
  string internal constant VT_SWAP_PATH_TOKEN_INVALID = '101'; // Invalid token information
  string internal constant CLAIMER_UNAUTHORIZED = '102'; // 'The claimer is not authorized'
  string internal constant YD_INVALID_CONFIGURATION = '103'; // 'The yield distribution's invalid configuration'
  string internal constant CALLER_NOT_EMISSION_MANAGER = '104'; // 'The caller must be emission manager'
  string internal constant CALLER_NOT_INCENTIVE_CONTROLLER = '105'; // 'The caller must be incentive controller'
  string internal constant YD_VR_ASSET_ALREADY_IN_USE = '106'; // Vault is already registered
  string internal constant YD_VR_INVALID_VAULT = '107'; // Invalid vault is used for an asset
  string internal constant YD_VR_INVALID_REWARDS_AMOUNT = '108'; // Rewards amount should be bigger than before
  string internal constant YD_VR_REWARD_TOKEN_NOT_VALID = '109'; // The reward token must be same with configured address
  string internal constant YD_VR_ASSET_NOT_REGISTERED = '110';
  string internal constant YD_VR_CALLER_NOT_VAULT = '111'; // The caller must be same with configured vault address
  string internal constant LS_INVALID_CONFIGURATION = '112'; // Invalid Leverage Swapper configuration
  string internal constant LS_SWAP_AMOUNT_NOT_GT_0 = '113'; // Collateral amount needs to be greater than zero
  string internal constant LS_STABLE_COIN_NOT_SUPPORTED = '114'; // Doesn't support swap for the stable coin
  string internal constant LS_SUPPLY_NOT_ALLOWED = '115'; // no sufficient funds
  string internal constant LS_SUPPLY_FAILED = '116'; // Deposit fails when leverage works
  string internal constant LS_REMOVE_ITERATION_OVER = '117'; // Withdraw iteration limit over
  string internal constant CALLER_NOT_WHITELIST_USER = '118'; // 'The caller must be whitelist user'

  enum CollateralManagerErrors {
    NO_ERROR,
    NO_COLLATERAL_AVAILABLE,
    COLLATERAL_CANNOT_BE_LIQUIDATED,
    CURRRENCY_NOT_BORROWED,
    HEALTH_FACTOR_ABOVE_THRESHOLD,
    NOT_ENOUGH_LIQUIDITY,
    NO_ACTIVE_RESERVE,
    HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD,
    INVALID_EQUAL_ASSETS_TO_SWAP,
    FROZEN_RESERVE
  }
}

// File: contracts/dependencies/openzeppelin/contracts/Address.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
  /**
   * @dev Returns true if `account` is a contract.
   *
   * [IMPORTANT]
   * ====
   * It is unsafe to assume that an address for which this function returns
   * false is an externally-owned account (EOA) and not a contract.
   *
   * Among others, `isContract` will return false for the following
   * types of addresses:
   *
   *  - an externally-owned account
   *  - a contract in construction
   *  - an address where a contract will be created
   *  - an address where a contract lived, but was destroyed
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
    // for accounts without code, i.e. `keccak256('')`
    bytes32 codehash;
    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      codehash := extcodehash(account)
    }
    return (codehash != accountHash && codehash != 0x0);
  }

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

    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (bool success, ) = recipient.call{value: amount}('');
    require(success, 'Address: unable to send value, recipient may have reverted');
  }
}

// File: contracts/interfaces/IScaledBalanceToken.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

interface IScaledBalanceToken {
  /**
   * @dev Returns the scaled balance of the user. The scaled balance is the sum of all the
   * updated stored balance divided by the reserve's liquidity index at the moment of the update
   * @param user The user whose balance is calculated
   * @return The scaled balance of the user
   **/
  function scaledBalanceOf(address user) external view returns (uint256);

  /**
   * @dev Returns the scaled balance of the user and the scaled total supply.
   * @param user The address of the user
   * @return The scaled balance of the user
   * @return The scaled balance and the scaled total supply
   **/
  function getScaledUserBalanceAndSupply(address user) external view returns (uint256, uint256);

  /**
   * @dev Returns the scaled total supply of the variable debt token. Represents sum(debt/index)
   * @return The scaled total supply
   **/
  function scaledTotalSupply() external view returns (uint256);
}

// File: contracts/interfaces/IInitializableAToken.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

import {ILendingPool} from './ILendingPool.sol';
import {ISturdyIncentivesController} from './ISturdyIncentivesController.sol';

/**
 * @title IInitializableAToken
 * @notice Interface for the initialize function on AToken
 * @author Sturdy, inspiration from Aave
 **/
interface IInitializableAToken {
  /**
   * @dev Emitted when an aToken is initialized
   * @param underlyingAsset The address of the underlying asset
   * @param pool The address of the associated lending pool
   * @param treasury The address of the treasury
   * @param incentivesController The address of the incentives controller for this aToken
   * @param aTokenDecimals the decimals of the underlying
   * @param aTokenName the name of the aToken
   * @param aTokenSymbol the symbol of the aToken
   * @param params A set of encoded parameters for additional initialization
   **/
  event Initialized(
    address indexed underlyingAsset,
    address indexed pool,
    address treasury,
    address incentivesController,
    uint8 aTokenDecimals,
    string aTokenName,
    string aTokenSymbol,
    bytes params
  );

  /**
   * @dev Initializes the aToken
   * @param pool The address of the lending pool where this aToken will be used
   * @param treasury The address of the Sturdy treasury, receiving the fees on this aToken
   * @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH)
   * @param incentivesController The smart contract managing potential incentives distribution
   * @param aTokenDecimals The decimals of the aToken, same as the underlying asset's
   * @param aTokenName The name of the aToken
   * @param aTokenSymbol The symbol of the aToken
   */
  function initialize(
    ILendingPool pool,
    address treasury,
    address underlyingAsset,
    ISturdyIncentivesController incentivesController,
    uint8 aTokenDecimals,
    string calldata aTokenName,
    string calldata aTokenSymbol,
    bytes calldata params
  ) external;
}

// File: contracts/interfaces/ISturdyIncentivesController.sol



// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

interface ISturdyIncentivesController {
  event RewardsAccrued(address indexed user, uint256 amount);

  event RewardsClaimed(address indexed user, address indexed to, uint256 amount);

  event RewardsClaimed(
    address indexed user,
    address indexed to,
    address indexed claimer,
    uint256 amount
  );

  event ClaimerSet(address indexed user, address indexed claimer);

  /*
   * @dev Returns the configuration of the distribution for a certain asset
   * @param asset The address of the reference asset of the distribution
   * @return The asset index, the emission per second and the last updated timestamp
   **/
  function getAssetData(address asset)
    external
    view
    returns (
      uint256,
      uint256,
      uint256
    );

  /**
   * @dev Whitelists an address to claim the rewards on behalf of another address
   * @param user The address of the user
   * @param claimer The address of the claimer
   */
  function setClaimer(address user, address claimer) external payable;

  /**
   * @dev Returns the whitelisted claimer for a certain address (0x0 if not set)
   * @param user The address of the user
   * @return The claimer address
   */
  function getClaimer(address user) external view returns (address);

  /**
   * @dev Configure assets for a certain rewards emission
   * @param assets The assets to incentivize
   * @param emissionsPerSecond The emission for each asset
   */
  function configureAssets(address[] calldata assets, uint256[] calldata emissionsPerSecond)
    external
    payable;

  /**
   * @dev Called by the corresponding asset on any update that affects the rewards distribution
   * @param user The address of the user
   * @param userBalance The balance of the user of the asset in the lending pool
   * @param totalSupply The total supply of the asset in the lending pool
   **/
  function handleAction(
    address user,
    uint256 totalSupply,
    uint256 userBalance
  ) external;

  /**
   * @dev Returns the total of rewards of an user, already accrued + not yet accrued
   * @param user The address of the user
   * @return The rewards
   **/
  function getRewardsBalance(address[] calldata assets, address user)
    external
    view
    returns (uint256);

  /**
   * @dev Claims reward for an user, on all the assets of the lending pool, accumulating the pending rewards
   * @param amount Amount of rewards to claim
   * @param to Address that will be receiving the rewards
   * @return Rewards claimed
   **/
  function claimRewards(
    address[] calldata assets,
    uint256 amount,
    address to
  ) external returns (uint256);

  /**
   * @dev Claims reward for an user on behalf, on all the assets of the lending pool, accumulating the pending rewards. The caller must
   * be whitelisted via "allowClaimOnBehalf" function by the RewardsAdmin role manager
   * @param amount Amount of rewards to claim
   * @param user Address to check and claim rewards
   * @param to Address that will be receiving the rewards
   * @return Rewards claimed
   **/
  function claimRewardsOnBehalf(
    address[] calldata assets,
    uint256 amount,
    address user,
    address to
  ) external returns (uint256);

  /**
   * @dev returns the unclaimed rewards of the user
   * @param user the address of the user
   * @return the unclaimed user rewards
   */
  function getUserUnclaimedRewards(address user) external view returns (uint256);

  /**
   * @dev returns the unclaimed rewards of the user
   * @param user the address of the user
   * @param asset The asset to incentivize
   * @return the user index for the asset
   */
  function getUserAssetData(address user, address asset) external view returns (uint256);

  /**
   * @dev for backward compatibility with previous implementation of the Incentives controller
   */
  function REWARD_TOKEN() external view returns (address);

  /**
   * @dev for backward compatibility with previous implementation of the Incentives controller
   */
  function PRECISION() external view returns (uint8);

  /**
   * @dev Gets the distribution end timestamp of the emissions
   */
  function DISTRIBUTION_END() external view returns (uint256);
}

// File: contracts/interfaces/ISwapRouter.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

import './IUniswapV3SwapCallback.sol';

/// @title Router token swapping functionality
/// @notice Functions for swapping tokens via Uniswap V3
interface ISwapRouter is IUniswapV3SwapCallback {
  struct ExactInputSingleParams {
    address tokenIn;
    address tokenOut;
    uint24 fee;
    address recipient;
    uint256 deadline;
    uint256 amountIn;
    uint256 amountOutMinimum;
    uint160 sqrtPriceLimitX96;
  }

  /// @notice Swaps `amountIn` of one token for as much as possible of another token
  /// @param params The parameters necessary for the swap, encoded as `ExactInputSingleParams` in calldata
  /// @return amountOut The amount of the received token
  function exactInputSingle(ExactInputSingleParams calldata params)
    external
    payable
    returns (uint256 amountOut);

  struct ExactInputParams {
    bytes path;
    address recipient;
    uint256 deadline;
    uint256 amountIn;
    uint256 amountOutMinimum;
  }

  /// @notice Swaps `amountIn` of one token for as much as possible of another along the specified path
  /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactInputParams` in calldata
  /// @return amountOut The amount of the received token
  function exactInput(ExactInputParams calldata params)
    external
    payable
    returns (uint256 amountOut);

  struct ExactOutputSingleParams {
    address tokenIn;
    address tokenOut;
    uint24 fee;
    address recipient;
    uint256 deadline;
    uint256 amountOut;
    uint256 amountInMaximum;
    uint160 sqrtPriceLimitX96;
  }

  /// @notice Swaps as little as possible of one token for `amountOut` of another token
  /// @param params The parameters necessary for the swap, encoded as `ExactOutputSingleParams` in calldata
  /// @return amountIn The amount of the input token
  function exactOutputSingle(ExactOutputSingleParams calldata params)
    external
    payable
    returns (uint256 amountIn);

  struct ExactOutputParams {
    bytes path;
    address recipient;
    uint256 deadline;
    uint256 amountOut;
    uint256 amountInMaximum;
  }

  /// @notice Swaps as little as possible of one token for `amountOut` of another along the specified path (reversed)
  /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactOutputParams` in calldata
  /// @return amountIn The amount of the input token
  function exactOutput(ExactOutputParams calldata params)
    external
    payable
    returns (uint256 amountIn);
}

// File: contracts/interfaces/IUniswapV3SwapCallback.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.0;

/// @title Callback for IUniswapV3PoolActions#swap
/// @notice Any contract that calls IUniswapV3PoolActions#swap must implement this interface
interface IUniswapV3SwapCallback {
  /// @notice Called to `msg.sender` after executing a swap via IUniswapV3Pool#swap.
  /// @dev In the implementation you must pay the pool tokens owed for the swap.
  /// The caller of this method must be checked to be a UniswapV3Pool deployed by the canonical UniswapV3Factory.
  /// amount0Delta and amount1Delta can both be 0 if no tokens were swapped.
  /// @param amount0Delta The amount of token0 that was sent (negative) or must be received (positive) by the pool by
  /// the end of the swap. If positive, the callback must send that amount of token0 to the pool.
  /// @param amount1Delta The amount of token1 that was sent (negative) or must be received (positive) by the pool by
  /// the end of the swap. If positive, the callback must send that amount of token1 to the pool.
  /// @param data Any data passed through by the caller via the IUniswapV3PoolActions#swap call
  function uniswapV3SwapCallback(
    int256 amount0Delta,
    int256 amount1Delta,
    bytes calldata data
  ) external;
}