from __future__ import annotations

from typing import Protocol, runtime_checkable


@runtime_checkable
class ChannelRegistration(Protocol):
    """注册到 ``ChannelRegistry`` 的渠道配置需至少提供 ``enabled``。"""

    enabled: bool


class ChannelRegistry:
    """渠道注册、启停、状态查询（与具体 IM 无关）。"""

    def __init__(self) -> None:
        self._registry: dict[str, ChannelRegistration] = {}
        self._running: dict[str, bool] = {}

    def register_channel(self, channel_id: str, cfg: ChannelRegistration) -> None:
        self._registry[channel_id] = cfg
        if channel_id not in self._running:
            self._running[channel_id] = cfg.enabled

    def start_channel(self, channel_id: str) -> None:
        self._running[channel_id] = True

    def stop_channel(self, channel_id: str) -> None:
        self._running[channel_id] = False

    def get_channel_status(self, channel_id: str) -> dict[str, str | bool]:
        cfg = self._registry.get(channel_id)
        return {
            "channel_id": channel_id,
            "registered": cfg is not None,
            "running": bool(self._running.get(channel_id)),
            "enabled": bool(cfg and cfg.enabled),
        }