# ABOUTME: Tests for locale detection and string lookup.
# ABOUTME: Verifies correct language detection from env vars and /etc/locale.conf.

import os
from pathlib import Path
from unittest.mock import patch

from moonlock.i18n import Strings, detect_locale, load_strings


class TestDetectLocale:
    """Tests for locale detection."""

    @patch.dict(os.environ, {"LANG": "de_DE.UTF-8"})
    def test_detects_german_from_env(self):
        assert detect_locale() == "de"

    @patch.dict(os.environ, {"LANG": "en_US.UTF-8"})
    def test_detects_english_from_env(self):
        assert detect_locale() == "en"

    @patch.dict(os.environ, {"LANG": ""}, clear=False)
    def test_reads_locale_conf_when_env_empty(self, tmp_path: Path):
        locale_conf = tmp_path / "locale.conf"
        locale_conf.write_text("LANG=de_DE.UTF-8\n")
        assert detect_locale(locale_conf_path=locale_conf) == "de"

    @patch.dict(os.environ, {"LANG": "C"})
    def test_c_locale_defaults_to_english(self):
        assert detect_locale() == "en"

    @patch.dict(os.environ, {"LANG": "POSIX"})
    def test_posix_locale_defaults_to_english(self):
        assert detect_locale() == "en"

    @patch.dict(os.environ, {}, clear=True)
    def test_missing_env_and_no_file_defaults_to_english(self, tmp_path: Path):
        nonexistent = tmp_path / "nonexistent"
        assert detect_locale(locale_conf_path=nonexistent) == "en"


class TestLoadStrings:
    """Tests for string table loading."""

    def test_german_strings(self):
        strings = load_strings("de")
        assert isinstance(strings, Strings)
        assert strings.password_placeholder == "Passwort"

    def test_english_strings(self):
        strings = load_strings("en")
        assert strings.password_placeholder == "Password"

    def test_unknown_locale_falls_back_to_english(self):
        strings = load_strings("fr")
        assert strings.password_placeholder == "Password"

    def test_lockscreen_specific_strings_exist(self):
        strings = load_strings("de")
        assert strings.unlock_button is not None
        assert strings.fingerprint_prompt is not None
        assert strings.fingerprint_success is not None

    def test_faillock_template_strings(self):
        strings = load_strings("de")
        msg = strings.faillock_attempts_remaining.format(n=2)
        assert "2" in msg