import pytest
from unittest.mock import patch, MagicMock
import importlib.util
import sys
import os
from typing import Any

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

# Load gui_2.py as a module for testing
spec = importlib.util.spec_from_file_location("gui_2", "gui_2.py")
gui_2 = importlib.util.module_from_spec(spec)
sys.modules["gui_2"] = gui_2
spec.loader.exec_module(gui_2)
from gui_2 import App

@pytest.fixture
def app_instance() -> Any:
 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_diagnostics_panel_initialization(app_instance: Any) -> None:
 assert "Diagnostics" in app_instance.show_windows
 assert "frame_time" in app_instance.perf_history
 assert len(app_instance.perf_history["frame_time"]) == 100

def test_diagnostics_history_updates(app_instance: Any) -> None:
 """
 Verifies that the internal performance history is updated correctly.
 This logic is inside the render loop in gui_2.py, but we can test
 the data structure and initialization.
 """
 assert "fps" in app_instance.perf_history
 assert len(app_instance.perf_history["fps"]) == 100
 # Test pushing a value manually as a surrogate for the render loop
 app_instance.perf_history["fps"].pop(0)
 app_instance.perf_history["fps"].append(60.0)
 assert app_instance.perf_history["fps"][-1] == 60.0