"""
Pytest fixtures for integration tests.

Uses SQLite in-memory (aiosqlite) for speed.
Each test function gets a fresh database and HTTP client.
"""

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_session
from app.main import app

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


@pytest_asyncio.fixture
async def test_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
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)
    await engine.dispose()


@pytest_asyncio.fixture
async def db_session(test_engine):
    """Direct database session for use in fixtures and assertions."""
    session_factory = async_sessionmaker(test_engine, expire_on_commit=False)
    async with session_factory() as session:
        yield session


@pytest_asyncio.fixture
async def client(test_engine) -> AsyncClient:
    """HTTP client wired to a fresh in-memory database."""
    session_factory = async_sessionmaker(test_engine, expire_on_commit=False)

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

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


# ---------------------------------------------------------------------------
# Helper factories
# ---------------------------------------------------------------------------


async def create_user_and_login(
    client: AsyncClient,
    email: str = "user@example.com",
    password: str = "password123",
    full_name: str = "Test User",
) -> tuple[dict, str]:
    """Register a user and return (user_json, access_token)."""
    reg_resp = await client.post(
        "/api/v1/auth/register",
        json={"email": email, "password": password, "full_name": full_name},
    )
    assert reg_resp.status_code == 201, reg_resp.text

    login_resp = await client.post(
        "/api/v1/auth/login",
        data={"username": email, "password": password},
        headers={"Content-Type": "application/x-www-form-urlencoded"},
    )
    assert login_resp.status_code == 200, login_resp.text
    return reg_resp.json(), login_resp.json()["access_token"]