from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, sessionmaker

from .config import get_settings


class Base(DeclarativeBase):
    pass


def engine_for(url: str | None = None):
    url = url or get_settings().database_url
    return create_engine(url, connect_args={"check_same_thread": False} if url.startswith("sqlite") else {}, pool_pre_ping=True)


engine = engine_for()
SessionLocal = sessionmaker(bind=engine, autoflush=False, expire_on_commit=False)


def get_db():
    with SessionLocal() as session:
        yield session