import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Use absolute path to ensure dataclaw.db is created in the backend root directory, 
# preventing nested backend/backend/dataclaw.db issues when starting from different cwd.
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
DB_PATH = os.path.join(BASE_DIR, "dataclaw.db")
SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_PATH}"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

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