import unittest

from frigate_camera_control_bridge.app import language_from_accept_header


class LanguageDetectionTest(unittest.TestCase):
    def test_browser_language_uses_supported_base_code(self):
        self.assertEqual(
            language_from_accept_header("pl-PL,pl;q=0.9,en-US;q=0.8"),
            "pl",
        )

    def test_quality_weight_wins_over_order(self):
        self.assertEqual(
            language_from_accept_header("en-US;q=0.4,pl-PL;q=0.9"),
            "pl",
        )

    def test_unsupported_languages_fall_back_to_english(self):
        self.assertEqual(language_from_accept_header("fr-FR,de;q=0.8"), "en")

    def test_empty_header_falls_back_to_english(self):
        self.assertEqual(language_from_accept_header(None), "en")


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