from collections.abc import Iterator
from contextlib import contextmanager

from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import Session
from sqlalchemy.pool import StaticPool

from app.db import Base, get_db_session
from app.main import app


@contextmanager
def make_test_client() -> Iterator[tuple[TestClient, object]]:
    engine = create_engine(
        "sqlite:///:memory:",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    Base.metadata.create_all(engine)

    def override_db_session():
        with Session(engine) as session:
            yield session

    app.dependency_overrides[get_db_session] = override_db_session
    try:
        yield TestClient(app), engine
    finally:
        app.dependency_overrides.clear()
        engine.dispose()