pragma solidity ^0.5.16;

import "./Owned.sol";

contract BaseMigration is Owned {
    constructor(address _owner) internal Owned(_owner) {}

    // safety value to return ownership (anyone can invoke)
    function returnOwnership(address forContract) public {
        bytes memory payload = abi.encodeWithSignature("nominateNewOwner(address)", owner);

        // solhint-disable avoid-low-level-calls
        (bool success, ) = forContract.call(payload);

        if (!success) {
            // then try legacy way
            bytes memory legacyPayload = abi.encodeWithSignature("nominateOwner(address)", owner);

            // solhint-disable avoid-low-level-calls
            (bool legacySuccess, ) = forContract.call(legacyPayload);

            require(legacySuccess, "Legacy nomination failed");
        }
    }
}