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

import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';
import {ILendingPool} from './ILendingPool.sol';
import {IAaveIncentivesController} from './IAaveIncentivesController.sol';
import {IInitializableStaticATokenLM} from './IInitializableStaticATokenLM.sol';

interface IStaticATokenLM is IERC20, IInitializableStaticATokenLM {
  struct SignatureParams {
    uint8 v;
    bytes32 r;
    bytes32 s;
  }

  /**
   * @notice Deposits `ASSET` in the Aave protocol and mints static aTokens to msg.sender
   * @param recipient The address that will receive the static aTokens
   * @param amount The amount of underlying `ASSET` to deposit (e.g. deposit of 100 USDC)
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   * @param fromUnderlying bool
   * - `true` if the msg.sender comes with underlying tokens (e.g. USDC)
   * - `false` if the msg.sender comes already with aTokens (e.g. aUSDC)
   * @return uint256 The amount of StaticAToken minted, static balance
   **/
  function deposit(
    address recipient,
    uint256 amount,
    uint16 referralCode,
    bool fromUnderlying
  ) external returns (uint256);

  /**
   * @notice Burns `amount` of static aToken, with recipient receiving the corresponding amount of `ASSET`
   * @param recipient The address that will receive the amount of `ASSET` withdrawn from the Aave protocol
   * @param amount The amount to withdraw, in static balance of StaticAToken
   * @param toUnderlying bool
   * - `true` for the recipient to get underlying tokens (e.g. USDC)
   * - `false` for the recipient to get aTokens (e.g. aUSDC)
   * @return amountToBurn: StaticATokens burnt, static balance
   * @return amountToWithdraw: underlying/aToken send to `recipient`, dynamic balance
   **/
  function withdraw(
    address recipient,
    uint256 amount,
    bool toUnderlying
  ) external returns (uint256, uint256);

  /**
   * @notice Burns `amount` of static aToken, with recipient receiving the corresponding amount of `ASSET`
   * @param recipient The address that will receive the amount of `ASSET` withdrawn from the Aave protocol
   * @param amount The amount to withdraw, in dynamic balance of aToken/underlying asset
   * @param toUnderlying bool
   * - `true` for the recipient to get underlying tokens (e.g. USDC)
   * - `false` for the recipient to get aTokens (e.g. aUSDC)
   * @return amountToBurn: StaticATokens burnt, static balance
   * @return amountToWithdraw: underlying/aToken send to `recipient`, dynamic balance
   **/
  function withdrawDynamicAmount(
    address recipient,
    uint256 amount,
    bool toUnderlying
  ) external returns (uint256, uint256);

  /**
   * @notice Implements the permit function as for
   * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
   * @param owner The owner of the funds
   * @param spender The spender
   * @param value The amount
   * @param deadline The deadline timestamp, type(uint256).max for max deadline
   * @param v Signature param
   * @param s Signature param
   * @param r Signature param
   */
  function permit(
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  /**
   * @notice Allows to deposit on Aave via meta-transaction
   * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
   * @param depositor Address from which the funds to deposit are going to be pulled
   * @param recipient Address that will receive the staticATokens, in the average case, same as the `depositor`
   * @param value The amount to deposit
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   * @param fromUnderlying bool
   * - `true` if the msg.sender comes with underlying tokens (e.g. USDC)
   * - `false` if the msg.sender comes already with aTokens (e.g. aUSDC)
   * @param deadline The deadline timestamp, type(uint256).max for max deadline
   * @param sigParams Signature params: v,r,s
   * @return uint256 The amount of StaticAToken minted, static balance
   */
  function metaDeposit(
    address depositor,
    address recipient,
    uint256 value,
    uint16 referralCode,
    bool fromUnderlying,
    uint256 deadline,
    SignatureParams calldata sigParams
  ) external returns (uint256);

  /**
   * @notice Allows to withdraw from Aave via meta-transaction
   * https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
   * @param owner Address owning the staticATokens
   * @param recipient Address that will receive the underlying withdrawn from Aave
   * @param staticAmount The amount of staticAToken to withdraw. If > 0, `dynamicAmount` needs to be 0
   * @param dynamicAmount The amount of underlying/aToken to withdraw. If > 0, `staticAmount` needs to be 0
   * @param toUnderlying bool
   * - `true` for the recipient to get underlying tokens (e.g. USDC)
   * - `false` for the recipient to get aTokens (e.g. aUSDC)
   * @param deadline The deadline timestamp, type(uint256).max for max deadline
   * @param sigParams Signature params: v,r,s
   * @return amountToBurn: StaticATokens burnt, static balance
   * @return amountToWithdraw: underlying/aToken send to `recipient`, dynamic balance
   */
  function metaWithdraw(
    address owner,
    address recipient,
    uint256 staticAmount,
    uint256 dynamicAmount,
    bool toUnderlying,
    uint256 deadline,
    SignatureParams calldata sigParams
  ) external returns (uint256, uint256);

  /**
   * @notice Utility method to get the current aToken balance of an user, from his staticAToken balance
   * @param account The address of the user
   * @return uint256 The aToken balance
   **/
  function dynamicBalanceOf(address account) external view returns (uint256);

  /**
   * @notice Converts a static amount (scaled balance on aToken) to the aToken/underlying value,
   * using the current liquidity index on Aave
   * @param amount The amount to convert from
   * @return uint256 The dynamic amount
   **/
  function staticToDynamicAmount(uint256 amount) external view returns (uint256);

  /**
   * @notice Converts an aToken or underlying amount to the what it is denominated on the aToken as
   * scaled balance, function of the principal and the liquidity index
   * @param amount The amount to convert from
   * @return uint256 The static (scaled) amount
   **/
  function dynamicToStaticAmount(uint256 amount) external view returns (uint256);

  /**
   * @notice Returns the Aave liquidity index of the underlying aToken, denominated rate here
   * as it can be considered as an ever-increasing exchange rate
   * @return The liquidity index
   **/
  function rate() external view returns (uint256);

  /**
   * @notice Function to return a dynamic domain separator, in order to be compatible with forks changing chainId
   * @return bytes32 The domain separator
   **/
  function getDomainSeparator() external view returns (bytes32);

  /**
   * @notice Claims rewards from `INCENTIVES_CONTROLLER` and updates internal accounting of rewards.
   */
  function collectAndUpdateRewards() external;

  /**
   * @notice Claim rewards on behalf of a user and send them to a receiver
   * @dev Only callable by if sender is onBehalfOf or sender is approved claimer
   * @param onBehalfOf The address to claim on behalf of
   * @param receiver The address to receive the rewards
   * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
   */
  function claimRewardsOnBehalf(
    address onBehalfOf,
    address receiver,
    bool forceUpdate
  ) external;

  /**
   * @notice Claim rewards and send them to a receiver
   * @param receiver The address to receive the rewards
   * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
   */
  function claimRewards(address receiver, bool forceUpdate) external;

  /**
   * @notice Claim rewards
   * @param forceUpdate Flag to retrieve latest rewards from `INCENTIVES_CONTROLLER`
   */
  function claimRewardsToSelf(bool forceUpdate) external;

  /**
   * @notice Get the total claimable rewards of the contract.
   * @return The current balance + pending rewards from the `_incentivesController`
   */
  function getTotalClaimableRewards() external view returns (uint256);

  /**
   * @notice Get the total claimable rewards for a user in WAD
   * @param user The address of the user
   * @return The claimable amount of rewards in WAD
   */
  function getClaimableRewards(address user) external view returns (uint256);

  /**
   * @notice The unclaimed rewards for a user in WAD
   * @param user The address of the user
   * @return The unclaimed amount of rewards in WAD
   */
  function getUnclaimedRewards(address user) external view returns (uint256);

  function getAccRewardsPerToken() external view returns (uint256);

  function getLifetimeRewardsClaimed() external view returns (uint256);

  function getLifetimeRewards() external view returns (uint256);

  function getLastRewardBlock() external view returns (uint256);

  function LENDING_POOL() external returns (ILendingPool);

  function INCENTIVES_CONTROLLER() external returns (IAaveIncentivesController);

  function ATOKEN() external returns (IERC20);

  function ASSET() external returns (IERC20);

  function REWARD_TOKEN() external returns (IERC20);
}