# 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.

"""LeanMigrate 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 .env.models import LeanMigrateAction, LeanMigrateObservation


class LeanMigrateEnv(EnvClient[LeanMigrateAction, LeanMigrateObservation, State]):
    """
    Client for the Lean Migrate 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:
        >>> # Connect to a running server
        >>> with LeanMigrateEnv(base_url="http://localhost:8000") as client:
        ...     result = client.reset()
        ...     print(result.observation.echoed_message)
        ...
        ...     result = client.step(LeanMigrateAction(message="Hello!"))
        ...     print(result.observation.echoed_message)

    Example with Docker:
        >>> # Automatically start container and connect
        >>> client = LeanMigrateEnv.from_docker_image("lean_migrate-env:latest")
        >>> try:
        ...     result = client.reset()
        ...     result = client.step(LeanMigrateAction(message="Test"))
        ... finally:
        ...     client.close()
    """

    def _step_payload(self, action: LeanMigrateAction) -> Dict:
        return action.model_dump()

    def _parse_result(self, payload: Dict) -> StepResult[LeanMigrateObservation]:
        obs_data = payload.get("observation", {})
        observation = LeanMigrateObservation.model_validate(obs_data)

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

    def _parse_state(self, payload: Dict) -> State:
        return State.model_validate(payload)