from typing import List

from src.constants import COUNTRY_TO_REGION_MAP, LANGUAGE_TO_COUNTRIES_MAP


def get_language_countries(language: str) -> List[str]:
    """Get the list of countries where a language is spoken."""
    return LANGUAGE_TO_COUNTRIES_MAP.get(language, ["Unknown"])


def get_language_regions(language: str) -> List[str]:
    """Get the list of African regions where a language is spoken."""
    countries = get_language_countries(language)
    regions = set()
    for country in countries:
        region = COUNTRY_TO_REGION_MAP.get(country)
        if region:
            regions.add(region)
    return list(regions) if regions else ["Unknown"]


def get_all_regions() -> List[str]:
    """Get all unique African regions."""
    regions = set(COUNTRY_TO_REGION_MAP.values())
    return sorted(regions)


def get_languages_by_region(region: str) -> List[str]:
    """Get all languages spoken in a specific African region."""
    countries_in_region = [c for c, r in COUNTRY_TO_REGION_MAP.items() if r == region]
    languages = set()
    for lang, countries in LANGUAGE_TO_COUNTRIES_MAP.items():
        if any(c in countries_in_region for c in countries):
            languages.add(lang)
    return list(languages)