from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import os

# Ensure data directory exists
os.makedirs("data", exist_ok=True)

SQLALCHEMY_DATABASE_URL = "sqlite:///./data/seismo_fleet.db"

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():
    """Dependency for database sessions"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def get_db_session():
    """Get a database session directly (not as a dependency)"""
    return SessionLocal()
