from collections.abc import Iterator
from contextlib import contextmanager

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

from app.config import get_settings

_settings = get_settings()

engine = create_engine(
    _settings.database_url,
    pool_pre_ping=True,
    future=True,
)

SessionLocal = sessionmaker(bind=engine, autoflush=False, expire_on_commit=False, future=True)


@contextmanager
def session_scope() -> Iterator[Session]:
    session = SessionLocal()
    try:
        yield session
        session.commit()
    except Exception:
        session.rollback()
        raise
    finally:
        session.close()


def get_session() -> Iterator[Session]:
    with session_scope() as session:
        yield session