"""
Pytest configuration and shared fixtures.
"""
import asyncio
import uuid
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.core.config import settings
settings.testing = True
from app.db.database import get_async_session
from app.main import app
from app.models.base import Base
import app.models as app_models  # noqa: F401 — register all models

# ── In-memory SQLite for tests ─────────────────────────────────────────────────
TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"

test_engine = create_async_engine(TEST_DATABASE_URL, echo=False)
TestSessionLocal = async_sessionmaker(
    test_engine, class_=AsyncSession, expire_on_commit=False
)


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


# ── Session-scoped event loop ─────────────────────────────────────────────────

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


# ── Database setup ────────────────────────────────────────────────────────────

@pytest_asyncio.fixture(scope="session", autouse=True)
async def create_test_tables():
    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)


# ── HTTP client fixture ───────────────────────────────────────────────────────

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


# ── DB session fixture ────────────────────────────────────────────────────────

@pytest_asyncio.fixture
async def db() -> AsyncGenerator[AsyncSession, None]:
    async with TestSessionLocal() as session:
        yield session