"""Test fixtures.

DB-backed tests require ``TEST_DATABASE_URL`` (an async URL to a *disposable*
Postgres); without it they skip, so the no-DB unit suite still runs anywhere.
The schema is built from the models via ``create_all`` and dropped per test for
isolation.
"""

import os

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

import app.models  # noqa: F401 — register all models on Base.metadata
from app.core.db import get_session
from app.main import app
from app.models import Base

TEST_DATABASE_URL = os.getenv("TEST_DATABASE_URL")


@pytest_asyncio.fixture
async def client():
    if not TEST_DATABASE_URL:
        import pytest

        pytest.skip("TEST_DATABASE_URL not set")

    engine = create_async_engine(TEST_DATABASE_URL)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)
        await conn.run_sync(Base.metadata.create_all)

    sessionmaker = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)

    async def _override_session():
        async with sessionmaker() as session:
            yield session

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

    app.dependency_overrides.clear()
    await engine.dispose()