import importlib.util
import hashlib
import hmac
import json
from pathlib import Path
import time
import unittest
from unittest.mock import patch


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


class DashboardTest(unittest.TestCase):
    def test_dashboard_aggregates_authorized_vehicle_and_station_data(self):
        def fake_post(path, body):
            if path.endswith("realtime/query"):
                return [
                    {"vin": "VIN1", "motionStatus": "driving", "speedKmh": 18, "activeToday": True, "online": True},
                    {"vin": "VIN2", "motionStatus": "idle", "speedKmh": 0, "activeToday": True, "online": True},
                    {"vin": "VIN3", "motionStatus": "offline", "speedKmh": 0, "activeToday": False, "online": False},
                ]
            if path.endswith("mileage/query"):
                return [
                    {"vin": "VIN1", "status": "NORMAL", "dailyMileageKm": 12.345},
                    {"vin": "VIN2", "status": "NORMAL", "dailyMileageKm": 7.655},
                    {"vin": "VIN3", "status": "NO_DATA", "dailyMileageKm": None},
                ]
            if path.endswith("hydrogen-stations/query"):
                return [{"id": "1", "cooperative": True}, {"id": "2", "cooperative": False}]
            raise AssertionError(path)

        with patch.object(server, "_post_open_platform", side_effect=fake_post):
            with patch.object(server, "_cache", {}):
                result = server._load_dashboard()

        self.assertEqual(result["summary"]["totalVehicles"], 3)
        self.assertEqual(result["summary"]["onlineVehicles"], 2)
        self.assertEqual(result["summary"]["drivingVehicles"], 1)
        self.assertEqual(result["summary"]["todayMileageKm"], 20.0)
        self.assertEqual(result["summary"]["totalStations"], 2)
        self.assertEqual(result["summary"]["cooperativeStations"], 1)
        self.assertEqual(result["vehicles"][0]["dailyMileageKm"], 12.345)
        self.assertEqual(result["vehicles"][2]["dailyMileageKm"], 0)

    def test_public_station_directory_uses_an_allowlist(self):
        stations = [{
            "id": "GD-1", "name": "广州合作站", "shortName": "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, "internalOwner": "must-not-leak",
        }]
        with patch.object(server, "_post_open_platform", return_value=stations):
            with patch.object(server, "_cache", {}):
                result = server._load_public_stations()

        station = result["stations"][0]
        self.assertEqual(result["access"]["level"], "public")
        self.assertEqual(station["name"], "广州合作站")
        self.assertTrue(station["cooperative"])
        self.assertNotIn("monthlyHydrogenKg", station)
        self.assertNotIn("totalHydrogenKg", station)
        self.assertNotIn("internalOwner", station)

    def test_signed_operations_session_requires_the_operations_scope(self):
        with patch.object(server, "LOCAL_ACCESS_CODE", "LN-map-test-code"), patch.object(server, "SESSION_SECRET", b"test-session-secret"), patch.object(server, "SESSION_TTL_SECONDS", 600):
            principal = server._authorizer().authorize_access_code("LN-map-test-code")
            token = server._create_session(principal)
            session = server._read_session(f"{server.SESSION_COOKIE_NAME}={token}")

            self.assertEqual(session["subject"], "local-access-code")
            self.assertIn(server.OPERATIONS_READ_SCOPE, session["scopes"])
            self.assertIsNone(server._read_session(f"{server.SESSION_COOKIE_NAME}={token}tampered"))

            legacy_payload = {"v": 1, "sub": "legacy", "scopes": [server.OPERATIONS_READ_SCOPE], "exp": 4_102_444_800}
            legacy_encoded = server._b64encode(server._json_bytes(legacy_payload))
            legacy_signature = server._b64encode(hmac.new(server.SESSION_SECRET, legacy_encoded.encode("ascii"), hashlib.sha256).digest())
            self.assertIsNone(server._read_session(f"{server.SESSION_COOKIE_NAME}={legacy_encoded}.{legacy_signature}"))

    def test_default_operations_session_expires_after_thirty_minutes(self):
        self.assertEqual(server.SESSION_TTL_SECONDS, 1800)
        with patch.object(server, "SESSION_SECRET", b"test-session-secret"), patch.object(server, "SESSION_TTL_SECONDS", 1800):
            token = server._create_session({"subject": "test", "scopes": [server.OPERATIONS_READ_SCOPE]})
            encoded, _ = token.split(".", 1)
            payload = json.loads(server._b64decode(encoded))
            self.assertGreaterEqual(payload["exp"], int(time.time()) + 1798)
            self.assertLessEqual(payload["exp"], int(time.time()) + 1801)


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