from pathlib import Path

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

# Ensure DB directory exists
DB_DIR = Path("/app/storage/db")
DB_DIR.mkdir(parents=True, exist_ok=True)

SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"

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

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


def get_db() -> SessionLocal:
    """
    Dependency function to get a database session.
    This function will be used as a FastAPI dependency in route functions.
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()