from pymilvus import connections
from pymilvus.exceptions import ConnectionConfigException

class MilvusClientSingleton:
    _instance = None

    @staticmethod
    def get_instance(uri):
        if MilvusClientSingleton._instance is None:
            MilvusClientSingleton(uri)
        return MilvusClientSingleton._instance

    def __init__(self, uri):
        if MilvusClientSingleton._instance is not None:
            raise Exception("This class is a singleton!")
        try:
            # Use connections.connect() to establish the connection
            connections.connect(uri=uri)
            self._instance = connections  # Store the connections object
            print(f"Successfully connected to Milvus at {uri}")
        except ConnectionConfigException as e:
            print(f"Error connecting to Milvus: {e}")
            raise

    def __getattr__(self, name):
        # Delegate attribute access to the default connection
        return getattr(connections, name)