from __future__ import annotations

from collections.abc import Generator
from contextlib import contextmanager

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

from app.core.config import get_settings


DATABASE_URL = get_settings().database_url

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True,
    future=True,
)
SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, expire_on_commit=False, future=True)


def get_db() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


@contextmanager
def session_scope() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
        db.commit()
    except Exception:
        db.rollback()
        raise
    finally:
        db.close()