from __future__ import annotations

DEFAULT_KB_LANGUAGE = "ru"
SUPPORTED_KB_LANGUAGES = {"ru", "kz"}


def normalize_kb_language(value: str | None) -> str:
    normalized = str(value or DEFAULT_KB_LANGUAGE).strip().lower()
    return normalized if normalized in SUPPORTED_KB_LANGUAGES else DEFAULT_KB_LANGUAGE


def resolve_article_group_id(article_id: str, article_group_id: str | None) -> str:
    normalized_group = str(article_group_id or "").strip()
    return normalized_group or str(article_id).strip()