import pytest
from unittest.mock import patch, MagicMock
import importlib.util
import sys
import dearpygui.dearpygui as dpg

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

@pytest.fixture
def app_instance():
    """
    Fixture to create an instance of the App class for testing.
    It creates a real DPG context but mocks functions that would
    render a window or block execution.
    """
    dpg.create_context()
    
    # Patch only the functions that would show a window or block,
    # and the App methods that rebuild UI on init.
    with patch('dearpygui.dearpygui.create_viewport'), \
         patch('dearpygui.dearpygui.setup_dearpygui'), \
         patch('dearpygui.dearpygui.show_viewport'), \
         patch('dearpygui.dearpygui.start_dearpygui'), \
         patch('gui.load_config', return_value={}), \
         patch.object(App, '_rebuild_files_list'), \
         patch.object(App, '_rebuild_shots_list'), \
         patch.object(App, '_rebuild_disc_list'), \
         patch.object(App, '_rebuild_disc_roles_list'), \
         patch.object(App, '_rebuild_discussion_selector'), \
         patch.object(App, '_refresh_project_widgets'):
        
        app = App()
        yield app
    
    dpg.destroy_context()

def test_telemetry_panel_updates_correctly(app_instance):
    """
    Tests that the _update_telemetry_panel method correctly updates
    DPG widgets based on the stats from ai_client.
    """
    # 1. Define the mock stats to be returned by ai_client
    mock_stats = {
        "provider": "anthropic",
        "limit": 180000,
        "current": 135000,
        "percentage": 75.0,
    }

    # 2. Patch the dependencies
    with patch('ai_client.get_history_bleed_stats', return_value=mock_stats) as mock_get_stats, \
         patch('dearpygui.dearpygui.set_value') as mock_set_value, \
         patch('dearpygui.dearpygui.does_item_exist', return_value=True) as mock_does_item_exist:

        # 3. Call the method under test
        app_instance._update_telemetry_panel()

        # 4. Assert the results
        mock_get_stats.assert_called_once()
        
        # Check that the code verified the existence of the widgets
        mock_does_item_exist.assert_any_call("token_budget_bar")
        mock_does_item_exist.assert_any_call("token_budget_label")

        # Check that the widgets were updated with the correct values
        mock_set_value.assert_any_call("token_budget_bar", 0.75)
        # Note: My implementation formats numbers with commas
        mock_set_value.assert_any_call("token_budget_label", "135,000 / 180,000")