"""节点实例管理路由。

提供管理后台查看节点实例与手动停止实例的能力。实例生命周期仍由
NodeManager 控制，路由只转发停止请求。
"""

from __future__ import annotations

from fastapi import APIRouter, Depends, HTTPException

from app.db import Database
from app.node_manager import NodeManager

router = APIRouter(prefix="/api/admin/node-instances", tags=["node-instances"])


def _get_db() -> Database:
    """从应用状态延迟获取数据库实例。"""
    from app.main import app

    return app.state.db


def _get_manager() -> NodeManager:
    """从应用状态延迟获取节点管理器。"""
    from app.main import app

    return app.state.node_manager


@router.get("")
def list_instances(db: Database = Depends(_get_db)) -> list[dict]:
    """返回全部节点实例记录。"""
    return db.list_instances()


@router.post("/{instance_id}/stop")
def stop_instance(
    instance_id: str,
    db: Database = Depends(_get_db),
    manager: NodeManager = Depends(_get_manager),
) -> dict:
    """请求停止指定实例；停止后实例记录保留为 stopped 状态。"""
    manager.stop_instance(instance_id)
    instance = next(
        (item for item in db.list_instances() if item["id"] == instance_id),
        None,
    )
    if instance is None:
        raise HTTPException(status_code=404, detail="instance not found")
    return {"stopped": instance_id}