from __future__ import annotations
from typing import Any

class DeviceRuntime:
    """Minimal on-device runtime abstraction.

    This is intentionally lightweight and designed to be extended.
    """

    def __init__(self, device: str = "generic-arm-v8") -> None:
        self.device = device
        self.initialized = False

    def initialize(self, config: dict[str, Any] | None = None) -> None:
        # Initialize runtime with optional device-specific config
        self.initialized = True

    def infer(self, inputs: Any) -> Any:
        if not self.initialized:
            raise RuntimeError("DeviceRuntime not initialized")
        # Placeholder: return inputs as mock inference result
        return {"result": inputs}

    def plan(self, state: Any) -> Any:
        if not self.initialized:
            raise RuntimeError("DeviceRuntime not initialized")
        # Placeholder planning: echo back state as plan delta
        return {"plan_delta": state}