// SPDX-License-Identifier: MIT
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title Compound ERC20 CToken
 *
 * @dev Implementation of the interest bearing token for the DLP protocol.
 * @author Compound
 */
interface ICToken is IERC20 {
    /*** User Interface ***/

    function balanceOfUnderlying(address owner) external returns (uint256);

    function isCToken() external returns (bool);

    function underlying() external returns (address);

    function mint(uint256 mintAmount) external returns (uint256);

    function exchangeRateCurrent() external returns (uint256);

    function borrow(uint256 borrowAmount) external returns (uint256);

    function getAccountSnapshot(address account)
        external
        view
        returns (
            uint256 error,
            uint256 balance,
            uint256 borrowed,
            uint256 exchangeRate
        );

    function decimals() external view returns (uint256);
}