import unittest

from flask import Flask

from app.utils import locale as _LOCALE


_FLASK_APP = Flask(__name__)


class LocaleRuntimeTests(unittest.TestCase):
    def tearDown(self):
        _LOCALE.set_locale("th")

    def test_background_locale_normalizes_legacy_and_unknown_values(self):
        _LOCALE.set_locale("zh-CN")
        self.assertEqual(_LOCALE.get_locale(), "th")
        _LOCALE.set_locale("en-US")
        self.assertEqual(_LOCALE.get_locale(), "en")
        _LOCALE.set_locale("fr")
        self.assertEqual(_LOCALE.get_locale(), "th")

    def test_request_locale_negotiates_supported_language_only(self):
        with _FLASK_APP.test_request_context(
            headers={"Accept-Language": "zh-CN;q=1, en-US;q=0.8, th;q=0"}
        ):
            self.assertEqual(_LOCALE.get_locale(), "en")

    def test_translation_fallback_is_not_chinese(self):
        _LOCALE.set_locale("zh")
        translated = _LOCALE.t("api.projectNotFound", id="demo")
        self.assertFalse(any("\u3400" <= char <= "\u9fff" for char in translated))
        self.assertNotEqual(translated, "api.projectNotFound")
        self.assertFalse(
            any("\u3400" <= char <= "\u9fff" for char in _LOCALE.get_language_instruction())
        )


if __name__ == "__main__":
    unittest.main()