# 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.

"""Vector Borne Disease Control 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 (
    VectorBorneDiseaseControlAction,
    VectorBorneDiseaseControlObservation,
    ZoneState,
)


class VectorBorneDiseaseControlEnv(
    EnvClient[VectorBorneDiseaseControlAction, VectorBorneDiseaseControlObservation, State]
):
    """
    Client for the Vector Borne Disease Control 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 VectorBorneDiseaseControlEnv(base_url="http://localhost:8000") as client:
        ...     result = client.reset()
        ...     obs = result.observation
        ...     print(f"Zones: {len(obs.zones)}")
        ...
        ...     action = VectorBorneDiseaseControlAction(action_type=ActionType.SPRAY, zone_id=0)
        ...     result = client.step(action)
        ...     print(f"Reward: {result.reward}")

    Example with Docker:
        >>> # Automatically start container and connect
        >>> client = VectorBorneDiseaseControlEnv.from_docker_image("vector_borne_disease_control-env:latest")
        >>> try:
        ...     result = client.reset()
        ...     action = VectorBorneDiseaseControlAction(action_type=ActionType.WAIT)
        ...     result = client.step(action)
        ... finally:
        ...     client.close()
    """

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

        Args:
            action: VectorBorneDiseaseControlAction instance

        Returns:
            Dictionary representation suitable for JSON encoding
        """
        return {
            "action_type": action.action_type,
            "zone_id": action.zone_id,
        }

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

        Args:
            payload: JSON response data from server

        Returns:
            StepResult with VectorBorneDiseaseControlObservation
        """
        obs_data = payload.get("observation", {})

        # Parse zones
        zones = {}
        for zone_id, zone_data in obs_data.get("zones", {}).items():
            zones[int(zone_id)] = ZoneState(**zone_data)

        # Parse adjacency
        adjacency = {}
        for zone_id, neighbors in obs_data.get("adjacency", {}).items():
            adjacency[int(zone_id)] = neighbors

        observation = VectorBorneDiseaseControlObservation(
            zones=zones,
            adjacency=adjacency,
            remaining_spray=obs_data.get("remaining_spray", 0),
            remaining_traps=obs_data.get("remaining_traps", 0),
            step=obs_data.get("step", 0),
            cumulative_avg_infestation_rate=obs_data.get("cumulative_avg_infestation_rate", 0.0),
        )

        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),
        )