import importlib.util
from pathlib import Path
import unittest
from unittest.mock import patch


SPEC = importlib.util.spec_from_file_location("station_navigation_server", Path(__file__).parents[1] / "server.py")
server = importlib.util.module_from_spec(SPEC)
SPEC.loader.exec_module(server)


class StationNavigationTest(unittest.TestCase):
    def test_directory_is_a_positive_allowlist_without_hydrogen_data(self):
        source = [{
            "id": "GD-1", "name": "广州合作站", "province": "广东省", "city": "广州市",
            "district": "黄埔区", "address": "开源大道1号", "longitude": 113.2, "latitude": 23.1,
            "cooperative": True, "monthlyHydrogenKg": 88.8, "totalHydrogenKg": 999.9,
            "vehicleCount": 20,
        }]
        with patch.object(server, "_post_open_platform", return_value=source):
            result = server._load_station_directory()

        self.assertEqual(result["summary"], {"totalStations": 1, "cooperativeStations": 1})
        station = result["stations"][0]
        self.assertEqual(station["name"], "广州合作站")
        self.assertNotIn("monthlyHydrogenKg", station)
        self.assertNotIn("totalHydrogenKg", station)
        self.assertNotIn("vehicleCount", station)

    def test_static_assets_are_fingerprinted(self):
        self.assertRegex(server.STATIC_ASSET_VERSION, r"^[0-9a-f]{16}$")

    def test_default_cache_window_is_two_minutes(self):
        self.assertEqual(server.STATION_CACHE_SECONDS, 120)

    def test_cache_reuses_directory_snapshot_within_window(self):
        calls = []
        with patch.object(server, "_cache", {}):
            first = server._cached("station-directory", 120, lambda: calls.append("load") or {"version": 1})
            second = server._cached("station-directory", 120, lambda: calls.append("load") or {"version": 2})
        self.assertEqual(calls, ["load"])
        self.assertEqual(first, second)


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