"""Ukrainian or English messages, chosen like the shell helpers do (LC_ALL, LC_MESSAGES, LANG)."""

import os


def _ukrainian():
    for var in ("LC_ALL", "LC_MESSAGES", "LANG"):
        value = os.environ.get(var)
        if value:
            return value.startswith("uk")
    return False


UK = _ukrainian()


def t(uk, en):
    """The message in the user's language."""
    return uk if UK else en


def title(obj, default=""):
    """A {"uk": ..., "en": ...} title (or a plain string) in the user's language."""
    if isinstance(obj, dict):
        return obj.get("uk" if UK else "en") or obj.get("en") or default
    return obj or default