SEPARATOR = ":"
TELEGRAM_CALLBACK_MAX_BYTES = 64

ACTION_MUTE = "mute"
ACTION_DEEP = "deep"
ACTION_DOWNTIME = "dt"
ACTION_CONFIRM = "dty"
ACTION_CANCEL = "dtn"


def encode(action: str, *parts: object) -> str:
    data = SEPARATOR.join([action, *(str(part) for part in parts)])
    if len(data.encode()) > TELEGRAM_CALLBACK_MAX_BYTES:
        raise ValueError("callback_data zu lang")
    return data


def decode(data: str) -> tuple[str, tuple[str, ...]] | None:
    if not data or len(data.encode()) > TELEGRAM_CALLBACK_MAX_BYTES:
        return None
    action, *parts = data.split(SEPARATOR)
    return (action, tuple(parts)) if action else None