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

from app.core.config import get_settings


class Base(DeclarativeBase):
    pass


settings = get_settings()
engine = create_engine(settings.database_url, pool_pre_ping=True, future=True)
SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, future=True)


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


@contextmanager
def session_scope():
    db = SessionLocal()
    try:
        yield db
        db.commit()
    except Exception:
        db.rollback()
        raise
    finally:
        db.close()