import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base

DB_DIR = os.getenv("DATA_DIR", os.path.abspath("../../data"))
os.makedirs(DB_DIR, exist_ok=True)

DB_PATH = os.path.join(DB_DIR, "portfolio.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()