import pytest
import sys
import os
from unittest.mock import patch
from typing import Generator, Any
from gui_2 import App
import ai_client

# Ensure project root is in path
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))

@pytest.fixture
def app_instance() -> Generator[App, None, None]:
 """
 Fixture to create an instance of the App class for testing.
 """
 with patch('gui_2.load_config', return_value={}), \
   patch('gui_2.PerformanceMonitor'), \
   patch('gui_2.session_logger'), \
   patch.object(App, '_prune_old_logs'), \
   patch.object(App, '_load_active_project'):
  app = App()
  yield app

def test_gui_updates_on_event(app_instance: App) -> None:
 mock_stats = {"percentage": 50.0, "current": 500, "limit": 1000}
 app_instance.last_md = "mock_md"
 with patch('ai_client.get_token_stats', return_value=mock_stats) as mock_get_stats:
  # Simulate event
  ai_client.events.emit("response_received", payload={"text": "test"})
  # Process tasks manually
  app_instance._process_pending_gui_tasks()
  # Verify that _token_stats was updated (via _refresh_api_metrics)
  assert app_instance._token_stats["percentage"] == 50.0
  assert app_instance._token_stats["current"] == 500