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


MODULE_PATH = Path(__file__).resolve().parents[1] / "core" / "device_heartbeat.py"
SPEC = importlib.util.spec_from_file_location("device_heartbeat_under_test", MODULE_PATH)
HEARTBEAT = importlib.util.module_from_spec(SPEC)
SPEC.loader.exec_module(HEARTBEAT)


class DeviceHeartbeatTests(unittest.TestCase):
    def test_sends_current_device_id_to_server(self):
        calls = []
        requests_module = types.ModuleType("requests")
        api_module = types.ModuleType("api")
        api_module.device_post = lambda payload, timeout=5: (
            calls.append((payload, timeout)) or {"success": True, "lastSeenAt": "2026-07-28T00:00:00.000Z"}
        )
        with patch.dict(sys.modules, {"requests": requests_module, "api": api_module}):
            timestamp = HEARTBEAT.heartbeat_device(timeout=7)

        self.assertEqual(timestamp, "2026-07-28T00:00:00.000Z")
        self.assertEqual(calls, [({"type": "deviceHeartbeat"}, 7)])