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

DATABASE_NAME = "sns_api.db"
SQLALCHEMY_DATABASE_URL = f"sqlite:///./{DATABASE_NAME}"

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()


def init_db():
    """Initialize the database by creating all tables."""
    from models import Post, Comment, Like
    Base.metadata.create_all(bind=engine)