# backend/database.py
import os

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

SQLALCHEMY_DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./app.db")

connect_args = {"check_same_thread": False} if SQLALCHEMY_DATABASE_URL.startswith("sqlite") else {}
engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args=connect_args)
SessionLocal = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))

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