import pytest
from httpx import AsyncClient, ASGITransport
from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
from sqlalchemy.pool import NullPool
from app.main import app
from app.core import database
from app.core.config import settings


def make_test_engine():
    """Crée un engine sans pool pour éviter les conflits d'event loop entre tests."""
    return create_async_engine(settings.database_url, poolclass=NullPool)


@pytest.fixture
async def db_session():
    engine = make_test_engine()
    session_factory = async_sessionmaker(engine, expire_on_commit=False)
    async with session_factory() as session:
        yield session
    await engine.dispose()


@pytest.fixture
async def client(db_session: AsyncSession):
    """Client HTTP qui injecte la session de test dans l'app FastAPI."""

    async def override_get_session():
        yield db_session

    app.dependency_overrides[database.get_session] = override_get_session
    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
        yield ac
    app.dependency_overrides.clear()