"""Unit tests for app.services.i18n."""
from __future__ import annotations

import pytest


def test_languages_contains_all_four_plus_english():
    from app.services.i18n import LANGUAGES
    assert set(LANGUAGES.keys()) == {"en", "it", "es", "fr", "de"}
    assert LANGUAGES["en"] == "English"
    assert LANGUAGES["it"] == "Italian"
    assert LANGUAGES["es"] == "Spanish"
    assert LANGUAGES["fr"] == "French"
    assert LANGUAGES["de"] == "German"


def test_active_languages_is_en_and_it_only():
    from app.services.i18n import ACTIVE_LANGUAGES
    assert ACTIVE_LANGUAGES == {"en", "it"}


def test_respond_in_clause_empty_for_english():
    from app.services.i18n import respond_in_clause
    assert respond_in_clause("en") == ""


def test_respond_in_clause_empty_for_none_or_empty():
    from app.services.i18n import respond_in_clause
    assert respond_in_clause("") == ""
    assert respond_in_clause(None) == ""


def test_respond_in_clause_italian():
    from app.services.i18n import respond_in_clause
    result = respond_in_clause("it")
    assert "Italian" in result
    assert result.startswith("\n\n")


def test_respond_in_clause_unknown_lang_falls_back_to_english():
    """Defensive: a raw POST or stale lang code should not crash the
    prompt assembly. Unknown codes map to no-suffix (English default)."""
    from app.services.i18n import respond_in_clause
    assert respond_in_clause("xx") == ""