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

DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./drugs.db")

# For SQLite, ensure the directory exists
if "sqlite" in DATABASE_URL:
    # Extract path from sqlite:/// URL
    db_path = DATABASE_URL.replace("sqlite:///", "")
    os.makedirs(os.path.dirname(db_path) or ".", exist_ok=True)

engine = create_engine(
    DATABASE_URL,
    connect_args={"check_same_thread": False} if "sqlite" in DATABASE_URL else {}
)

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

# Drop and recreate all tables (for development only)
Base.metadata.drop_all(bind=engine)
Base.metadata.create_all(bind=engine)

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