"""Test fixtures: async client + in-memory SQLite database."""
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.database import Base, get_db
from app.main import app

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


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


@pytest_asyncio.fixture(scope="session")
async def engine():
    engine = create_async_engine(TEST_DATABASE_URL, echo=False)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield engine
    await engine.dispose()


@pytest_asyncio.fixture
async def db(engine) -> AsyncGenerator[AsyncSession, None]:
    session_factory = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
    async with session_factory() as session:
        yield session


@pytest_asyncio.fixture
async def client(engine) -> AsyncGenerator[AsyncClient, None]:
    session_factory = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)

    async def override_get_db():
        async with session_factory() as session:
            yield session

    app.dependency_overrides[get_db] = override_get_db

    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://test") as ac:
        yield ac

    app.dependency_overrides.clear()