"""Unit tests for src/my_deepagent/i18n/__init__.py."""

from __future__ import annotations

import pytest

from my_deepagent.i18n import _load, resolve_lang, t


def test_t_welcome_default_ko() -> None:
    result = t("init.welcome")
    assert "my-deepagent" in result
    assert "환영합니다" in result


def test_t_welcome_en() -> None:
    result = t("init.welcome", lang="en")
    assert "Welcome" in result


def test_t_format_provider() -> None:
    result = t("login.saved", provider="openrouter")
    assert "openrouter" in result


def test_t_missing_key_returns_key_itself() -> None:
    result = t("nonexistent.missing_key")
    assert result == "nonexistent.missing_key"


def test_t_missing_section_returns_key_itself() -> None:
    result = t("no_such_section.key")
    assert result == "no_such_section.key"


def test_resolve_lang_env_en(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("MYDEEPAGENT_LANG", "en")
    assert resolve_lang() == "en"


def test_resolve_lang_env_ko(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("MYDEEPAGENT_LANG", "ko")
    assert resolve_lang() == "ko"


def test_resolve_lang_default_ko(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.delenv("MYDEEPAGENT_LANG", raising=False)
    assert resolve_lang() == "ko"


def test_resolve_lang_invalid_env_falls_back_to_default(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("MYDEEPAGENT_LANG", "fr")
    assert resolve_lang() == "ko"


def test_load_cache_same_instance() -> None:
    _load.cache_clear()
    first = _load("ko")
    second = _load("ko")
    assert first is second


def test_t_format_error_returns_template() -> None:
    # If fmt keys don't match, returns raw template string not raising
    result = t("login.saved", provider="openrouter")
    assert isinstance(result, str)
    assert len(result) > 0