import os
from pathlib import Path
from dotenv import load_dotenv
from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, sessionmaker

load_dotenv()

# Ensure data directory exists relative to project root
BASE_DIR = Path(__file__).resolve().parent.parent.parent
DATA_DIR = BASE_DIR / "data"
DATA_DIR.mkdir(parents=True, exist_ok=True)

# Build absolute SQLite URI so it works regardless of process working directory
DEFAULT_DB_PATH = DATA_DIR / "onboarding.db"
env_db_url = os.getenv("DATABASE_URL")

if env_db_url and not env_db_url.startswith("sqlite:///./"):
    DATABASE_URL = env_db_url
else:
    # Use robust absolute path for SQLite
    DATABASE_URL = f"sqlite:///{DEFAULT_DB_PATH.as_posix()}"

engine = create_engine(
    DATABASE_URL,
    connect_args={
        "check_same_thread": False
    },
)

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


class Base(DeclarativeBase):
    pass


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