# 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.

"""Code Migration 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 CodeMigrationAction, CodeMigrationObservation


class CodeMigrationEnv(
    EnvClient[CodeMigrationAction, CodeMigrationObservation, State]
):
    """
    Client for the Code Migration Environment.

    Example:
        >>> with CodeMigrationEnv(base_url="http://localhost:8000") as client:
        ...     result = client.reset()
        ...     print(result.observation.tool_output[:80])
        ...
        ...     action = CodeMigrationAction(tool_name="list_dir", tool_args={})
        ...     result = client.step(action)
        ...     print(result.observation.tool_output[:80])
    """

    def _step_payload(self, action: CodeMigrationAction) -> Dict:
        """Serialize action to JSON payload."""
        return {
            "tool_name": action.tool_name,
            "tool_args": action.tool_args,
        }

    def _parse_result(self, payload: Dict) -> StepResult[CodeMigrationObservation]:
        """Deserialize server response into StepResult."""
        obs_data = payload.get("observation", {})
        observation = CodeMigrationObservation(
            tool_output=obs_data.get("tool_output", ""),
            reward=payload.get("reward", 0.0),
            done=payload.get("done", False),
            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) -> State:
        """Deserialize state response including episode metadata."""
        return State(
            episode_id=payload.get("episode_id"),
            step_count=payload.get("step_count", 0),
            metadata=payload.get("metadata", {}),
        )