client.py

# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.

"""Customer Env Environment Client."""

from typing import Dict, Any

from openenv.core import EnvClient
from openenv.core.client_types import StepResult
from openenv.core.env_server.types import State

from models import CustomerAction, CustomerObservation


class CustomerEnv(
        EnvClient[CustomerAction, CustomerObservation, State]
):
    """
    Client for the Customer Env Environment (Banking POMDP).

    This client maintains a persistent WebSocket connection to the environment server,
    enabling efficient multi-step interactions with lower latency.
    """

    def _step_payload(self, action: CustomerAction) -> Dict[str, Any]:
        """
        Convert CustomerAction to JSON payload for step message.
        """
        return {
            "action_type": action.action_type,
            "content": action.content,
            "tool_args": action.tool_args,
        }

    def _parse_result(self, payload: Dict[str, Any]) -> StepResult[CustomerObservation]:
        """
        Parse server response into StepResult[CustomerObservation].
        """
        obs_data = payload.get("observation", {})
        
        observation = CustomerObservation(
            customer_reply=obs_data.get("customer_reply"),
            tool_response=obs_data.get("tool_response"),
            conversation_history=obs_data.get("conversation_history", ""),
            done=payload.get("done", False),
            reward=payload.get("reward", 0.0),
            metadata=obs_data.get("metadata", {}),
        )

        return StepResult(
            observation=observation,
            reward=payload.get("reward", 0.0),
            done=payload.get("done", False),
        )

    def _parse_state(self, payload: Dict[str, Any]) -> State:
        """
        Parse server response into State object.
        """
        return State(
            episode_id=payload.get("episode_id"),
            step_count=payload.get("step_count", 0),
        )