# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

"""FixOS environment client."""

from typing import Dict

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

from .models import FixOSAction, FixOSObservation


class FixOSEnv(
    EnvClient[FixOSAction, FixOSObservation, State]
):
    """
    Client for the FixOS environment.

    This client maintains a persistent WebSocket connection to the environment server,
    enabling efficient multi-step interactions with lower latency.
    Each client instance has its own dedicated environment session on the server.

    Example:
        >>> with FixOSEnv(base_url="http://localhost:8000") as client:
        ...     result = client.reset()
        ...     action = FixOSAction(command="status", args={})
        ...     result = client.step(action)
    """

    def _step_payload(self, action: FixOSAction) -> Dict:
        """
        Convert FixOSAction to JSON payload for step message.

        Args:
            action: FixOSAction instance

        Returns:
            Dictionary representation suitable for JSON encoding
        """
        return {"command": action.command, "args": action.args}

    def _parse_result(self, payload: Dict) -> StepResult[FixOSObservation]:
        """
        Parse server response into StepResult[FixOSObservation].

        Args:
            payload: JSON response data from server

        Returns:
            StepResult with FixOSObservation
        """
        obs_data = payload.get("observation", {})
        observation = FixOSObservation(
            command_output=obs_data.get("command_output", ""),
            processes=obs_data.get("processes", []),
            services=obs_data.get("services", []),
            filesystem=obs_data.get("filesystem", []),
            resources=obs_data.get("resources", {}),
            logs=obs_data.get("logs", []),
            history=obs_data.get("history", []),
            task_id=obs_data.get("task_id", ""),
            task_difficulty=obs_data.get("task_difficulty", ""),
            task_score=obs_data.get("task_score", 0.0),
            is_success_step=obs_data.get("is_success_step", False),
            remaining_steps=obs_data.get("remaining_steps", 0),
            done=payload.get("done", False),
            reward=payload.get("reward"),
        )

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

    def _parse_state(self, payload: Dict) -> State:
        """
        Parse server response into State object.

        Args:
            payload: JSON response from state request

        Returns:
            State object with episode_id and step_count
        """
        return State(
            episode_id=payload.get("episode_id"),
            step_count=payload.get("step_count", 0),
        )