import asyncio
from typing import AsyncGenerator

import pytest
import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine

from app.api.deps import get_db
from app.database import Base
from app.main import app

TEST_DB_URL = "sqlite+aiosqlite:///:memory:"

test_engine = create_async_engine(TEST_DB_URL, echo=False)
TestSession = async_sessionmaker(test_engine, class_=AsyncSession, expire_on_commit=False)


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


@pytest_asyncio.fixture(scope="function")
async def setup_db():
    async with test_engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield
    async with test_engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)


async def override_get_db() -> AsyncGenerator[AsyncSession, None]:
    async with TestSession() as session:
        yield session


@pytest_asyncio.fixture
async def client(setup_db) -> AsyncGenerator[AsyncClient, None]:
    app.dependency_overrides[get_db] = override_get_db
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://test") as c:
        yield c
    app.dependency_overrides.clear()


@pytest_asyncio.fixture
async def async_client(client: AsyncClient) -> AsyncGenerator[AsyncClient, None]:
    """Alias for client fixture for compatibility."""
    yield client