// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;
 
/**
 * @title IInterestRate interface
 * @dev Interface for the calculation of the interest rates
 * @author Bend
 */
interface IInterestRate {
  function baseVariableBorrowRate() external view returns (uint256);
 
  function getMaxVariableBorrowRate() external view returns (uint256);
 
  function calculateInterestRates(
    address reserve,
    uint256 availableLiquidity,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256, uint256);
 
  function calculateInterestRates(
    address reserve,
    address bToken,
    uint256 liquidityAdded,
    uint256 liquidityTaken,
    uint256 totalVariableDebt,
    uint256 reserveFactor
  ) external view returns (uint256 liquidityRate, uint256 variableBorrowRate);
}