import asyncio
from typing import AsyncGenerator, Generator
import pytest
from httpx import AsyncClient
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.pool import StaticPool

import pytest
from sqlalchemy_utils import drop_database, database_exists
from starlette.config import environ
from starlette.testclient import TestClient

# from src.database import Base, get_db
# from src.main import app

# Test database URL
TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"

engine = create_async_engine(
    TEST_DATABASE_URL,
    connect_args={"check_same_thread": False},
    poolclass=StaticPool,
)

async_session = sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
    autocommit=False,
    autoflush=False,
)


async def override_get_db() -> AsyncGenerator[AsyncSession, None]:
    async with async_session() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()


app.dependency_overrides[get_db] = override_get_db


@pytest.fixture(scope="session")
def event_loop() -> Generator:
    loop = asyncio.get_event_loop_policy().new_event_loop()
    yield loop
    loop.close()


@pytest.fixture(autouse=True)
async def setup_db() -> AsyncGenerator[None, None]:
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)


@pytest.fixture
async def client() -> AsyncGenerator[AsyncClient, None]:
    async with AsyncClient(app=app, base_url="http://test") as client:
        yield client