import pytest
from fastapi.testclient import TestClient
from app.main import create_app # Import the app factory function
from app.config import settings # Import settings to monkeypatch
import os

@pytest.fixture
def tmp_audio_dir(tmp_path):
    """Provides a temporary directory for audio caching for each test."""
    audio_dir = tmp_path / "test_audio_cache"
    audio_dir.mkdir()
    return audio_dir

@pytest.fixture
def app_instance(tmp_audio_dir, monkeypatch):
    """
    Provides a fresh FastAPI application instance for each test,
    with its AUDIO_CACHE_DIR redirected to a temporary location.
    """
    monkeypatch.setattr(settings, "AUDIO_CACHE_DIR", str(tmp_audio_dir))
    app = create_app()
    return app

@pytest.fixture
def app_client(app_instance):
    """Provides a TestClient instance for the FastAPI application."""
    with TestClient(app_instance) as client:
        yield client

@pytest.fixture
def piper_engine(app_instance):
    """Provides the PiperEngine instance from the registry of the fresh app instance."""
    # Access the engine registry from the app_instance
    return app_instance.ENGINE_REGISTRY.get("piper")