from fastapi import FastAPI

def add_ping_route(app: FastAPI, call_langflow):
    """
    Adds a /ping route to the given FastAPI app.
    Calls the provided call_langflow function with a test message to verify it's working.
    """
    @app.get("/ping")
    def ping():
        """Simple health check that also calls the chat function."""
        try:
            # Call the chat function with test message and empty history
            result = call_langflow("What is your name?", [])
            return {"status": "ok", "chat_result": result}
        except Exception as e:
            return {"status": "error", "detail": str(e)}