// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.10;

import {VersionedInitializable} from '@aave/core-v3/contracts/protocol/libraries/aave-upgradeability/VersionedInitializable.sol';
import {IERC20} from '@aave/core-v3/contracts/dependencies/openzeppelin/contracts/IERC20.sol';
import {ICollector} from './interfaces/ICollector.sol';

/**
 * @title Collector
 * @notice Stores the fees collected by the protocol and allows the fund administrator
 *         to approve or transfer the collected ERC20 tokens.
 * @dev Implementation contract that must be initialized using transparent proxy pattern.
 * @author Aave
 **/
contract Collector is VersionedInitializable, ICollector {
  // Store the current funds administrator address
  address internal _fundsAdmin;

  // Revision version of this implementation contract
  uint256 public constant REVISION = 1;

  /**
   * @dev Allow only the funds administrator address to call functions marked by this modifier
   */
  modifier onlyFundsAdmin() {
    require(msg.sender == _fundsAdmin, 'ONLY_BY_FUNDS_ADMIN');
    _;
  }

  /**
   * @dev Initialize the transparent proxy with the admin of the Collector
   * @param reserveController The address of the admin that controls Collector
   */
  function initialize(address reserveController) external initializer {
    _setFundsAdmin(reserveController);
  }

  /// @inheritdoc VersionedInitializable
  function getRevision() internal pure override returns (uint256) {
    return REVISION;
  }

  /// @inheritdoc ICollector
  function getFundsAdmin() external view returns (address) {
    return _fundsAdmin;
  }

  /// @inheritdoc ICollector
  function approve(IERC20 token, address recipient, uint256 amount) external onlyFundsAdmin {
    token.approve(recipient, amount);
  }

  /// @inheritdoc ICollector
  function transfer(IERC20 token, address recipient, uint256 amount) external onlyFundsAdmin {
    token.transfer(recipient, amount);
  }

  /// @inheritdoc ICollector
  function setFundsAdmin(address admin) external onlyFundsAdmin {
    _setFundsAdmin(admin);
  }

  /**
   * @dev Transfer the ownership of the funds administrator role.
   * @param admin The address of the new funds administrator
   */
  function _setFundsAdmin(address admin) internal {
    _fundsAdmin = admin;
    emit NewFundsAdmin(admin);
  }
}