from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from app.core.config import settings

# Ensure the database directory exists
settings.DB_DIR.mkdir(parents=True, exist_ok=True)

engine = create_engine(
    settings.SQLALCHEMY_DATABASE_URL,
    connect_args={"check_same_thread": False},  # Only needed for SQLite
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


def get_db():
    """
    Dependency for getting a database session.
    To be used with FastAPI's dependency injection system.
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()