from typing import Any
from google.protobuf.message import Message

class MessageHelper:
    @staticmethod
    def get_field(message: Message, field_name: str):
        """
        Retrieves the value of a field from a Protobuf message.

        :param message: A Protobuf Message object.
        :param field_name: The name of the field to retrieve.
        :return: The value of the specified field.
        :raises ValueError: If the input parameters are invalid.
        """
        if not message or not field_name or not isinstance(field_name, str) or not field_name.strip():
            raise ValueError("Some parameter is missing")

        descriptor = message.DESCRIPTOR
        field_descriptor = descriptor.fields[field_name]
        if not field_descriptor:
            raise ValueError(f"Field '{field_name}' not found in message descriptor")

        return getattr(field_descriptor, field_name)

    @staticmethod
    def set_field(message: Message, field_name: str, value: Any) -> None:
        if message is None or not field_name.strip() or value is None:
            raise ValueError("Some parameter is missing")

        setattr(message, message.DESCRIPTOR.fields[field_name], value)