// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;

import '../libraries/DataStruct.sol';
import '../libraries/Math.sol';

library Index {
  using WadRayMath for uint256;
  using Index for DataStruct.ReserveData;

  event LTokenIndexUpdated(address indexed asset, uint256 lTokenIndex, uint256 lastUpdateTimestamp);

  /**
   * @dev Returns the ongoing normalized income for the reserve
   * A value of 1e27 means there is no income. As time passes, the income is accrued
   * A value of 2*1e27 means for each unit of asset one unit of income has been accrued
   * @param reserve The reserve object
   * @return the normalized income. expressed in ray
   **/
  function getLTokenInterestIndex(DataStruct.ReserveData storage reserve)
    public
    view
    returns (uint256)
  {
    uint256 lastUpdateTimestamp = reserve.lastUpdateTimestamp;

    // strict equality is not dangerous here
    // divide-before-multiply dangerous-strict-equalities
    if (lastUpdateTimestamp == block.timestamp) {
      return reserve.lTokenInterestIndex;
    }

    uint256 newIndex = Math
    .calculateLinearInterest(reserve.depositAPY, lastUpdateTimestamp, block.timestamp)
    .rayMul(reserve.lTokenInterestIndex);

    return newIndex;
  }

  /**
   * @dev Updates the reserve indexes and the timestamp
   * @param reserve The reserve to be updated
   **/
  function updateState(DataStruct.ReserveData storage reserve, address asset) internal {
    if (reserve.depositAPY == 0) {
      reserve.lastUpdateTimestamp = block.timestamp;
      return;
    }

    reserve.lTokenInterestIndex = getLTokenInterestIndex(reserve);
    reserve.lastUpdateTimestamp = block.timestamp;

    emit LTokenIndexUpdated(asset, reserve.lTokenInterestIndex, reserve.lastUpdateTimestamp);
  }
}
[{"inputs":[{"internalType":"uint256","name":"maxReserveCount_","type":"uint256"},{"internalType":"address","name":"connector","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"collateralServiceProvider","type":"address"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"borrowAPY","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"borrowAmount","type":"uint256"}],"name":"Borrow","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"userDTokenBalance","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"feeOnCollateralServiceProvider","type":"uint256"}],"name":"Liquidation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":false,"internalType":"address","name":"lToken","type":"address"},{"indexed":false,"internalType":"address","name":"dToken","type":"address"},{"indexed":false,"internalType":"address","name":"interestModel","type":"address"},{"indexed":false,"internalType":"address","name":"tokenizer","type":"address"},{"indexed":false,"internalType":"address","name":"incentivePool","type":"address"},{"indexed":false,"internalType":"uint256","name":"moneyPoolFactor","type":"uint256"}],"name":"NewReserve","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"userDTokenBalance","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"feeOnCollateralServiceProvider","type":"uint256"}],"name":"Repay","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"activateMoneyPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"address","name":"lToken","type":"address"},{"internalType":"address","name":"dToken","type":"address"},{"internalType":"address","name":"interestModel","type":"address"},{"internalType":"address","name":"tokenizer","type":"address"},{"internalType":"address","name":"incentivePool","type":"address"},{"internalType":"uint256","name":"moneyPoolFactor_","type":"uint256"}],"name":"addNewReserve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"borrow","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"deactivateMoneyPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"getLTokenInterestIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"getReserveData","outputs":[{"components":[{"internalType":"uint256","name":"moneyPoolFactor","type":"uint256"},{"internalType":"uint256","name":"lTokenInterestIndex","type":"uint256"},{"internalType":"uint256","name":"borrowAPY","type":"uint256"},{"internalType":"uint256","name":"depositAPY","type":"uint256"},{"internalType":"uint256","name":"lastUpdateTimestamp","type":"uint256"},{"internalType":"address","name":"lTokenAddress","type":"address"},{"internalType":"address","name":"dTokenAddress","type":"address"},{"internalType":"address","name":"interestModelAddress","type":"address"},{"internalType":"address","name":"tokenizerAddress","type":"address"},{"internalType":"uint8","name":"id","type":"uint8"},{"internalType":"bool","name":"isPaused","type":"bool"},{"internalType":"bool","name":"isActivated","type":"bool"}],"internalType":"struct DataStruct.ReserveData","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"liquidate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"pauseMoneyPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"repay","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"unPauseMoneyPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"address","name":"newIncentivePool","type":"address"}],"name":"updateIncentivePool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"asset","type":"address"},{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]