import typing


def invalid_sdk_version(client_sdk_version: typing.Optional[str]) -> str:
    client_sdk_version = client_sdk_version or "<empty>"
    return f"The sarus SDK version {client_sdk_version} is invalid."


def incompatible_sdk_version(client_sdk_version: str) -> str:
    return (
        f"The version of the sarus SDK you installed ({client_sdk_version}) "
        "might not be compatible with your version of the server. "
        "Please check the release notes in the documentation to know which version to use."
    )