from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.core.config import settings

# For development, we can use SQLite if DATABASE_URL is not set or for simplicity
# But we'll follow the user's request for PostgreSQL
SQLALCHEMY_DATABASE_URL = settings.DATABASE_URL or "sqlite:///./sql_app.db"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL, 
    # check_same_thread is only needed for SQLite
    **({"connect_args": {"check_same_thread": False}} if "sqlite" in SQLALCHEMY_DATABASE_URL else {})
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

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