import json
from functools import lru_cache
from pathlib import Path

_LOCALE_LABELS = {
    "en": "English",
    "da": "Danish",
}


@lru_cache(maxsize=1)
def shared_i18n_catalog() -> dict:
    catalog_path = Path(__file__).resolve().parents[1] / "shared" / "i18n" / "lobby.json"
    with catalog_path.open(encoding="utf-8") as handle:
        return json.load(handle)


@lru_cache(maxsize=1)
def locale_config() -> tuple[str, tuple[str, ...]]:
    locales = shared_i18n_catalog().get("locales", {})
    default_locale = str(locales.get("default", "en")).strip().lower() or "en"
    supported_locales = tuple(
        locale.strip().lower() for locale in locales.get("supported", ["en", "da"]) if str(locale).strip()
    ) or ("en", "da")
    return default_locale, supported_locales


def django_languages() -> list[tuple[str, str]]:
    _default_locale, supported_locales = locale_config()
    return [(locale, _LOCALE_LABELS.get(locale, locale.upper())) for locale in supported_locales]