// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

import "../access/Controlled.sol";
import "./AccountBase.sol";


/**
 * @title Account
 *
 * @author Stanisław Głogowski <stan@pillarproject.io>
 */
contract Account is Controlled, AccountBase {
  address public implementation;

  /**
   * @dev Public constructor
   * @param registry_ account registry address
   * @param implementation_ account implementation address
   */
  constructor(
    address registry_,
    address implementation_
  )
    public
    Controlled()
  {
    registry = registry_;
    implementation = implementation_;
  }

  // external functions

  /**
   * @notice Payable receive
   */
  receive()
    external
    payable
  {
    //
  }

  /**
   * @notice Fallback
   */
  // solhint-disable-next-line payable-fallback
  fallback()
    external
  {
    if (msg.data.length != 0) {
      address implementation_ = implementation;

      // solhint-disable-next-line no-inline-assembly
      assembly {
        let calldedatasize := calldatasize()

        calldatacopy(0, 0, calldedatasize)

        let result := delegatecall(gas(), implementation_, 0, calldedatasize, 0, 0)
        let returneddatasize := returndatasize()

        returndatacopy(0, 0, returneddatasize)

        switch result
        case 0 { revert(0, returneddatasize) }
        default { return(0, returneddatasize) }
      }
    }
  }

  /**
   * @notice Sets implementation
   * @param implementation_ implementation address
   */
  function setImplementation(
    address implementation_
  )
    external
    onlyController
  {
    implementation = implementation_;
  }

  /**
   * @notice Executes transaction
   * @param to to address
   * @param value value
   * @param data data
   * @return transaction result
   */
  function executeTransaction(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    onlyController
    returns (bytes memory)
  {
    bytes memory result;
    bool succeeded;

    // solhint-disable-next-line avoid-call-value, avoid-low-level-calls
    (succeeded, result) = payable(to).call{value: value}(data);

    require(
      succeeded,
      "Account: transaction reverted"
    );

    return result;
  }
}