// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import {IERC20Detailed} from '../dependencies/openzeppelin/contracts/IERC20Detailed.sol';
import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol';
import {IUiPoolDataProvider} from './interfaces/IUiPoolDataProvider.sol';
import {ILendingPool} from '../interfaces/ILendingPool.sol';
import {IAaveOracle} from './interfaces/IAaveOracle.sol';
import {IAToken} from '../interfaces/IAToken.sol';
import {IVariableDebtToken} from '../interfaces/IVariableDebtToken.sol';
import {IStableDebtToken} from '../interfaces/IStableDebtToken.sol';
import {WadRayMath} from '../protocol/libraries/math/WadRayMath.sol';
import {ReserveConfiguration} from '../protocol/libraries/configuration/ReserveConfiguration.sol';
import {UserConfiguration} from '../protocol/libraries/configuration/UserConfiguration.sol';
import {DataTypes} from '../protocol/libraries/types/DataTypes.sol';
import {
  DefaultReserveInterestRateStrategy
} from '../protocol/lendingpool/DefaultReserveInterestRateStrategy.sol';

contract UiPoolDataProvider is IUiPoolDataProvider {
  using WadRayMath for uint256;
  using ReserveConfiguration for DataTypes.ReserveConfigurationMap;
  using UserConfiguration for DataTypes.UserConfigurationMap;

  address public constant MOCK_USD_ADDRESS = 0x10F7Fc1F91Ba351f9C629c5947AD69bD03C05b96;

  constructor() public {
  }

  function getInterestRateStrategySlopes(DefaultReserveInterestRateStrategy interestRateStrategy)
    internal
    view
    returns (
      uint256,
      uint256,
      uint256,
      uint256
    )
  {
    return (
      interestRateStrategy.variableRateSlope1(),
      interestRateStrategy.variableRateSlope2(),
      interestRateStrategy.stableRateSlope1(),
      interestRateStrategy.stableRateSlope2()
    );
  }

  function getReservesList(ILendingPoolAddressesProvider provider)
    public
    view
    override
    returns (address[] memory)
  {
    ILendingPool lendingPool = ILendingPool(provider.getLendingPool());
    return lendingPool.getReservesList();
  }

  function getSimpleReservesData(ILendingPoolAddressesProvider provider)
    public
    view
    override
    returns (
      AggregatedReserveData[] memory,
      uint256
    )
  {
    IAaveOracle oracle = IAaveOracle(provider.getPriceOracle());
    ILendingPool lendingPool = ILendingPool(provider.getLendingPool());
    address[] memory reserves = lendingPool.getReservesList();
    AggregatedReserveData[] memory reservesData = new AggregatedReserveData[](reserves.length);

    for (uint256 i = 0; i < reserves.length; i++) {
      AggregatedReserveData memory reserveData = reservesData[i];
      reserveData.underlyingAsset = reserves[i];

      // reserve current state
      DataTypes.ReserveData memory baseData =
        lendingPool.getReserveData(reserveData.underlyingAsset);
      reserveData.liquidityIndex = baseData.liquidityIndex;
      reserveData.variableBorrowIndex = baseData.variableBorrowIndex;
      reserveData.liquidityRate = baseData.currentLiquidityRate;
      reserveData.variableBorrowRate = baseData.currentVariableBorrowRate;
      reserveData.stableBorrowRate = baseData.currentStableBorrowRate;
      reserveData.lastUpdateTimestamp = baseData.lastUpdateTimestamp;
      reserveData.aTokenAddress = baseData.aTokenAddress;
      reserveData.stableDebtTokenAddress = baseData.stableDebtTokenAddress;
      reserveData.variableDebtTokenAddress = baseData.variableDebtTokenAddress;
      reserveData.interestRateStrategyAddress = baseData.interestRateStrategyAddress;
      // TODO: change naming to base something
      reserveData.priceInEth = oracle.getAssetPrice(reserveData.underlyingAsset);

      reserveData.availableLiquidity = IERC20Detailed(reserveData.underlyingAsset).balanceOf(
        reserveData.aTokenAddress
      );
      (
        reserveData.totalPrincipalStableDebt,
        ,
        reserveData.averageStableRate,
        reserveData.stableDebtLastUpdateTimestamp
      ) = IStableDebtToken(reserveData.stableDebtTokenAddress).getSupplyData();
      reserveData.totalScaledVariableDebt = IVariableDebtToken(reserveData.variableDebtTokenAddress)
        .scaledTotalSupply();

      // reserve configuration

      // we're getting this info from the aToken, because some of assets can be not compliant with ETC20Detailed
      reserveData.symbol = IERC20Detailed(reserveData.underlyingAsset).symbol();
      reserveData.name = '';

      (
        reserveData.baseLTVasCollateral,
        reserveData.reserveLiquidationThreshold,
        reserveData.reserveLiquidationBonus,
        reserveData.decimals,
        reserveData.reserveFactor
      ) = baseData.configuration.getParamsMemory();
      (
        reserveData.isActive,
        reserveData.isFrozen,
        reserveData.borrowingEnabled,
        reserveData.stableBorrowRateEnabled
      ) = baseData.configuration.getFlagsMemory();
      reserveData.usageAsCollateralEnabled = reserveData.baseLTVasCollateral != 0;
      (
        reserveData.variableRateSlope1,
        reserveData.variableRateSlope2,
        reserveData.stableRateSlope1,
        reserveData.stableRateSlope2
      ) = getInterestRateStrategySlopes(
        DefaultReserveInterestRateStrategy(reserveData.interestRateStrategyAddress)
      );
    }

    return (reservesData, oracle.getAssetPrice(MOCK_USD_ADDRESS));
  }

  function getUserReservesData(ILendingPoolAddressesProvider provider, address user)
    external
    view
    override
    returns (UserReserveData[] memory)
  {
    ILendingPool lendingPool = ILendingPool(provider.getLendingPool());
    address[] memory reserves = lendingPool.getReservesList();
    DataTypes.UserConfigurationMap memory userConfig = lendingPool.getUserConfiguration(user);

    UserReserveData[] memory userReservesData =
      new UserReserveData[](user != address(0) ? reserves.length : 0);

    for (uint256 i = 0; i < reserves.length; i++) {
      DataTypes.ReserveData memory baseData = lendingPool.getReserveData(reserves[i]);

      // user reserve data
      userReservesData[i].underlyingAsset = reserves[i];
      userReservesData[i].scaledATokenBalance = IAToken(baseData.aTokenAddress).scaledBalanceOf(
        user
      );
      userReservesData[i].usageAsCollateralEnabledOnUser = userConfig.isUsingAsCollateral(i);

      if (userConfig.isBorrowing(i)) {
        userReservesData[i].scaledVariableDebt = IVariableDebtToken(
          baseData
            .variableDebtTokenAddress
        )
          .scaledBalanceOf(user);
        userReservesData[i].principalStableDebt = IStableDebtToken(baseData.stableDebtTokenAddress)
          .principalBalanceOf(user);
        if (userReservesData[i].principalStableDebt != 0) {
          userReservesData[i].stableBorrowRate = IStableDebtToken(baseData.stableDebtTokenAddress)
            .getUserStableRate(user);
          userReservesData[i].stableBorrowLastUpdateTimestamp = IStableDebtToken(
            baseData
              .stableDebtTokenAddress
          )
            .getUserLastUpdated(user);
        }
      }
    }

    return (userReservesData);
  }

  // function getReservesData(ILendingPoolAddressesProvider provider, address user)
  //   external
  //   view
  //   override
  //   returns (
  //     AggregatedReserveData[] memory,
  //     UserReserveData[] memory,
  //     uint256
  //   )
  // {
  //   IAaveOracle oracle = IAaveOracle(provider.getPriceOracle());
  //   ILendingPool lendingPool = ILendingPool(provider.getLendingPool());
  //   address[] memory reserves = lendingPool.getReservesList();
  //   DataTypes.UserConfigurationMap memory userConfig = lendingPool.getUserConfiguration(user);

  //   AggregatedReserveData[] memory reservesData = new AggregatedReserveData[](reserves.length);
  //   UserReserveData[] memory userReservesData =
  //     new UserReserveData[](user != address(0) ? reserves.length : 0);

  //   for (uint256 i = 0; i < reserves.length; i++) {
  //     AggregatedReserveData memory reserveData = reservesData[i];
  //     reserveData.underlyingAsset = reserves[i];

  //     // reserve current state
  //     DataTypes.ReserveData memory baseData =
  //       lendingPool.getReserveData(reserveData.underlyingAsset);
  //     reserveData.liquidityIndex = baseData.liquidityIndex;
  //     reserveData.variableBorrowIndex = baseData.variableBorrowIndex;
  //     reserveData.liquidityRate = baseData.currentLiquidityRate;
  //     reserveData.variableBorrowRate = baseData.currentVariableBorrowRate;
  //     reserveData.stableBorrowRate = baseData.currentStableBorrowRate;
  //     reserveData.lastUpdateTimestamp = baseData.lastUpdateTimestamp;
  //     reserveData.aTokenAddress = baseData.aTokenAddress;
  //     reserveData.stableDebtTokenAddress = baseData.stableDebtTokenAddress;
  //     reserveData.variableDebtTokenAddress = baseData.variableDebtTokenAddress;
  //     reserveData.interestRateStrategyAddress = baseData.interestRateStrategyAddress;
  //     reserveData.priceInEth = oracle.getAssetPrice(reserveData.underlyingAsset);

  //     reserveData.availableLiquidity = IERC20Detailed(reserveData.underlyingAsset).balanceOf(
  //       reserveData.aTokenAddress
  //     );
  //     (
  //       reserveData.totalPrincipalStableDebt,
  //       ,
  //       reserveData.averageStableRate,
  //       reserveData.stableDebtLastUpdateTimestamp
  //     ) = IStableDebtToken(reserveData.stableDebtTokenAddress).getSupplyData();
  //     reserveData.totalScaledVariableDebt = IVariableDebtToken(reserveData.variableDebtTokenAddress)
  //       .scaledTotalSupply();

  //     // reserve configuration

  //     // we're getting this info from the aToken, because some of assets can be not compliant with ETC20Detailed
  //     reserveData.symbol = IERC20Detailed(reserveData.underlyingAsset).symbol();
  //     reserveData.name = '';

  //     (
  //       reserveData.baseLTVasCollateral,
  //       reserveData.reserveLiquidationThreshold,
  //       reserveData.reserveLiquidationBonus,
  //       reserveData.decimals,
  //       reserveData.reserveFactor
  //     ) = baseData.configuration.getParamsMemory();
  //     (
  //       reserveData.isActive,
  //       reserveData.isFrozen,
  //       reserveData.borrowingEnabled,
  //       reserveData.stableBorrowRateEnabled
  //     ) = baseData.configuration.getFlagsMemory();
  //     reserveData.usageAsCollateralEnabled = reserveData.baseLTVasCollateral != 0;
  //     (
  //       reserveData.variableRateSlope1,
  //       reserveData.variableRateSlope2,
  //       reserveData.stableRateSlope1,
  //       reserveData.stableRateSlope2
  //     ) = getInterestRateStrategySlopes(
  //       DefaultReserveInterestRateStrategy(reserveData.interestRateStrategyAddress)
  //     );

  //     if (user != address(0)) {
  //       // user reserve data
  //       userReservesData[i].underlyingAsset = reserveData.underlyingAsset;
  //       userReservesData[i].scaledATokenBalance = IAToken(reserveData.aTokenAddress)
  //         .scaledBalanceOf(user);
  //       userReservesData[i].usageAsCollateralEnabledOnUser = userConfig.isUsingAsCollateral(i);

  //       if (userConfig.isBorrowing(i)) {
  //         userReservesData[i].scaledVariableDebt = IVariableDebtToken(
  //           reserveData
  //             .variableDebtTokenAddress
  //         )
  //           .scaledBalanceOf(user);
  //         userReservesData[i].principalStableDebt = IStableDebtToken(
  //           reserveData
  //             .stableDebtTokenAddress
  //         )
  //           .principalBalanceOf(user);
  //         if (userReservesData[i].principalStableDebt != 0) {
  //           userReservesData[i].stableBorrowRate = IStableDebtToken(
  //             reserveData
  //               .stableDebtTokenAddress
  //           )
  //             .getUserStableRate(user);
  //           userReservesData[i].stableBorrowLastUpdateTimestamp = IStableDebtToken(
  //             reserveData
  //               .stableDebtTokenAddress
  //           )
  //             .getUserLastUpdated(user);
  //         }
  //       }
  //     }
  //   }

  //   return (
  //     reservesData,
  //     userReservesData,
  //     oracle.getAssetPrice(MOCK_USD_ADDRESS),
  //   );
  // }
}