"""
Connessione database per il worker – usa SQLAlchemy async (stesso stack del backend).
"""

from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase

from app.config import get_settings

settings = get_settings()

engine = create_async_engine(
    settings.database_url,
    echo=False,
    pool_size=5,
    max_overflow=10,
    pool_pre_ping=True,
)

AsyncSessionLocal = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
    autoflush=False,
    autocommit=False,
)


class Base(DeclarativeBase):
    pass


async def get_db_session() -> AsyncSession:
    """Restituisce una nuova sessione DB – da usare come context manager."""
    return AsyncSessionLocal()