//SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import { DSMath } from "../../../common/math.sol";
import { Basic } from "../../../common/basic.sol";
import { AaveLendingPoolProviderInterface, AaveDataProviderInterface } from "./interface.sol";

abstract contract Helpers is DSMath, Basic {
    
    /**
     * @dev Aave Lending Pool Provider
    */
    AaveLendingPoolProviderInterface constant internal aaveProvider = AaveLendingPoolProviderInterface(0xd05e3E715d945B59290df0ae8eF85c1BdB684744);

    /**
     * @dev Aave Protocol Data Provider
    */
    AaveDataProviderInterface constant internal aaveData = AaveDataProviderInterface(0x7551b5D2763519d4e37e8B81929D336De671d46d);

    /**
     * @dev Aave Referral Code
    */
    uint16 constant internal referralCode = 3228;

    /**
     * @dev Checks if collateral is enabled for an asset
     * @param token token address of the asset.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
    */
    function getIsColl(address token) internal view returns (bool isCol) {
        (, , , , , , , , isCol) = aaveData.getUserReserveData(token, address(this));
    }

    /**
     * @dev Get total debt balance & fee for an asset
     * @param token token address of the debt.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
     * @param rateMode Borrow rate mode (Stable = 1, Variable = 2)
    */
    function getPaybackBalance(address token, uint rateMode) internal view returns (uint) {
        (, uint stableDebt, uint variableDebt, , , , , , ) = aaveData.getUserReserveData(token, address(this));
        return rateMode == 1 ? stableDebt : variableDebt;
    }

    /**
     * @dev Get total collateral balance for an asset
     * @param token token address of the collateral.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
    */
    function getCollateralBalance(address token) internal view returns (uint bal) {
        (bal, , , , , , , ,) = aaveData.getUserReserveData(token, address(this));
    }
}