/**
 * useMonitoringData - 运行监控大屏数据 hook
 *
 * 数据源（全部来自 NetMesh 真实 API）：
 * - hosts:              props 传入（vault 里的设备列表）
 * - inspection.getLatestAll()   → 每台设备最新巡检结果（含 metrics：cpu/memory/online）
 * - inspectionAlertApi.getActive()  → 活动告警列表
 * - inspectionAlertApi.getStats()   → 告警统计
 * - inspectionRuleApi.list()        → 巡检规则（用于任务状态统计）
 */
import { useEffect, useState, useCallback, useRef, useMemo } from 'react';
import type { Host } from '../../domain/models';
import {
  inspectionResultApi,
  inspectionAlertApi,
  inspectionAlertRuleApi,
  inspectionSchedulerApi,
  inspectionDeviceApi,
  type AlertRecord,
  type InspectionResult,
  type AlertLevel,
  type AlertStats,
} from '../../infrastructure/inspection/inspectionApi';

// ===== 对外类型 =====

export interface MonitoringAlert {
  id: string;
  deviceId: string;
  deviceName: string;
  level: 'critical' | 'major' | 'warning' | 'minor' | 'info';
  message: string;
  time: string;
  metric?: string;
  metricValue?: string;
  threshold?: string;
}

export interface TrendPoint {
  date: string; // MM-DD
  count: number;
}

export interface TaskStats {
  running: number;
  success: number;
  failed: number;
  pending: number;
}

export interface TaskDevice {
  deviceId: string;
  deviceName: string;
  ip: string;
  status: 'running' | 'success' | 'failed' | 'pending';
  lastScanAt?: number;
  durationMs?: number;
  errorMessage?: string;
  interval?: number; // 巡检间隔（秒）
}

interface UseMonitoringDataResult {
  // 指标缓存
  cpuMap: Record<string, number>;
  memMap: Record<string, number>;
  onlineMap: Record<string, boolean>;
  timestampMap: Record<string, number>; // 每台设备最新巡检时间戳

  // 告警
  alerts: MonitoringAlert[];
  alarmTrend: TrendPoint[];
  alertStats: AlertStats | null;

  // 巡检任务
  taskStats: TaskStats;
  taskDevices: TaskDevice[];
  schedulerRunning: boolean;

  // 告警规则 & 派生阈值
  rules: any[];
  thresholds: {
    cpuCritical: number;
    cpuWarning: number;
    memCritical: number;
    memWarning: number;
    diskCritical: number;
    diskWarning: number;
  };

  // 操作
  refresh: () => Promise<void>;
  loading: boolean;

  // 浏览器远程访问环境下实际使用的 hosts（Electron 环境 = props.hosts）
  effectiveHosts: Host[];
}

// ===== localStorage 持久化（降级用，API 不可用时显示缓存） =====
const LS_CPU = 'netmesh:monitoring:cpuMap';
const LS_MEM = 'netmesh:monitoring:memMap';
const LS_ALERTS = 'netmesh:monitoring:alerts';
const LS_TREND = 'netmesh:monitoring:trend';

function readLS<T>(key: string, fallback: T): T {
  try {
    const raw = localStorage.getItem(key);
    if (!raw) return fallback;
    return JSON.parse(raw) as T;
  } catch {
    return fallback;
  }
}

function writeLS(key: string, value: unknown) {
  try {
    localStorage.setItem(key, JSON.stringify(value));
  } catch { /* 忽略 */ }
}

// 将 NetMesh AlertLevel 映射到监控页面的 5 级
function mapLevel(l: AlertLevel): MonitoringAlert['level'] {
  if (l === 'critical') return 'critical';
  if (l === 'warning') return 'warning';
  return 'info';
}

// 格式化告警时间：今天 → HH:mm，昨天 → 昨天 HH:mm，更早 → MM-DD HH:mm
function formatAlertTime(ts: number): string {
  const d = new Date(ts);
  const now = new Date();
  const isToday = d.toDateString() === now.toDateString();
  const yesterday = new Date(now);
  yesterday.setDate(yesterday.getDate() - 1);
  const isYesterday = d.toDateString() === yesterday.toDateString();
  const timeStr = d.toLocaleTimeString('zh-CN', { hour12: false, hour: '2-digit', minute: '2-digit' });
  if (isToday) return timeStr;
  if (isYesterday) return `昨天 ${timeStr}`;
  const ds = `${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
  return `${ds} ${timeStr}`;
}

// 从巡检结果 metrics 里提取 cpu 使用率（数字百分比）
function extractCpu(metrics: Record<string, any>): number {
  if (!metrics) return 0;
  // NetMesh 巡检标准字段
  if (typeof metrics.cpu_usage === 'number' && !isNaN(metrics.cpu_usage)) return metrics.cpu_usage;
  if (typeof metrics.cpu_usage === 'string') {
    const n = parseFloat(metrics.cpu_usage);
    if (!isNaN(n)) return n;
  }
  // 网络设备
  if (metrics.cpuUtilization !== undefined) {
    const v = Number(metrics.cpuUtilization);
    if (!isNaN(v)) return v;
  }
  if (metrics.displayCpu?.cpuUsage !== undefined) {
    const v = Number(metrics.displayCpu.cpuUsage);
    if (!isNaN(v)) return v;
  }
  // 遍历所有字段找数值型 CPU 字段
  for (const key of Object.keys(metrics)) {
    const kl = key.toLowerCase();
    if (kl.includes('cpu') && (kl.includes('usage') || kl.includes('util') || kl.includes('percent'))) {
      const v = metrics[key];
      if (typeof v === 'number' && !isNaN(v)) return v;
      if (typeof v === 'string') {
        const n = parseFloat(v);
        if (!isNaN(n)) return n;
      }
    }
  }
  return 0;
}

// 从巡检结果 metrics 里提取内存使用率
function extractMem(metrics: Record<string, any>): number {
  if (!metrics) return 0;
  // NetMesh 巡检标准字段
  if (typeof metrics.memory_usage === 'number' && !isNaN(metrics.memory_usage)) return metrics.memory_usage;
  if (typeof metrics.memory_usage === 'string') {
    const n = parseFloat(metrics.memory_usage);
    if (!isNaN(n)) return n;
  }
  // 网络设备
  if (metrics.displayMemory?.memPercent !== undefined) {
    const v = Number(metrics.displayMemory.memPercent);
    if (!isNaN(v)) return v;
  }
  if (metrics.memoryPercent !== undefined) {
    const v = Number(metrics.memoryPercent);
    if (!isNaN(v)) return v;
  }
  if (metrics.mem_percent !== undefined) {
    const v = Number(metrics.mem_percent);
    if (!isNaN(v)) return v;
  }
  // 遍历所有字段找数值型内存字段
  for (const key of Object.keys(metrics)) {
    const kl = key.toLowerCase();
    if ((kl.includes('mem') || kl.includes('memory')) && (kl.includes('usage') || kl.includes('util') || kl.includes('percent'))) {
      const v = metrics[key];
      if (typeof v === 'number' && !isNaN(v)) return v;
      if (typeof v === 'string') {
        const n = parseFloat(v);
        if (!isNaN(n)) return n;
      }
    }
  }
  // 如果有 mem_used 和 mem_total，计算百分比
  const used = metrics.mem_used ?? metrics.memory_used ?? metrics.used_memory;
  const total = metrics.mem_total ?? metrics.memory_total ?? metrics.total_memory;
  if (typeof used === 'number' && typeof total === 'number' && total > 0) {
    return Math.min(100, Math.round((used / total) * 100));
  }
  return 0;
}

// 生成过去 N 天的空趋势骨架
function buildTrendSkeleton(days = 14): TrendPoint[] {
  const today = new Date();
  const out: TrendPoint[] = [];
  for (let i = days - 1; i >= 0; i--) {
    const d = new Date(today);
    d.setDate(d.getDate() - i);
    const ds = `${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
    out.push({ date: ds, count: 0 });
  }
  return out;
}

// 把告警数组按天统计到趋势
function buildTrendFromAlerts(allAlerts: AlertRecord[], days = 14): TrendPoint[] {
  const trend = buildTrendSkeleton(days);
  const map = new Map(trend.map((t) => [t.date, 0]));
  const today = new Date();
  const earliest = new Date(today);
  earliest.setDate(earliest.getDate() - days + 1);
  earliest.setHours(0, 0, 0, 0);

  for (const a of allAlerts) {
    const t = new Date(a.triggered_at);
    if (t < earliest) continue;
    const ds = `${String(t.getMonth() + 1).padStart(2, '0')}-${String(t.getDate()).padStart(2, '0')}`;
    if (map.has(ds)) {
      map.set(ds, (map.get(ds) || 0) + 1);
    }
  }
  return trend.map((t) => ({ ...t, count: map.get(t.date) || 0 }));
}

// ===== Hook =====

// 工具函数：从 Host + keys 构造 SSH 连接配置（用于调度器执行巡检）
function buildSshConfig(host: Host, keys: any[]): Record<string, unknown> {
  const config: Record<string, unknown> = {
    host: host.hostname,
    port: host.port || 22,
    username: host.username,
    label: host.label || host.hostname,
  };
  if (host.password) {
    config.password = host.password;
  }
  // 私钥优先用 identityId 匹配 keys 数组
  const keyId = host.identityId || host.identityFileId;
  if (keyId) {
    const key = keys.find((k) => k.id === keyId);
    if (key?.privateKeyContent) {
      config.privateKey = key.privateKeyContent;
      if (key.passphrase) config.passphrase = key.passphrase;
    }
  }
  return config;
}

export function useMonitoringData(hosts: Host[], keys: any[] = []): UseMonitoringDataResult {
  const [cpuMap, setCpuMap] = useState<Record<string, number>>(() => readLS(LS_CPU, {}));
  const [memMap, setMemMap] = useState<Record<string, number>>(() => readLS(LS_MEM, {}));
  const [onlineMap, setOnlineMap] = useState<Record<string, boolean>>({});
  const [timestampMap, setTimestampMap] = useState<Record<string, number>>({});
  const [alerts, setAlerts] = useState<MonitoringAlert[]>(() => {
    const cached = readLS<MonitoringAlert[]>(LS_ALERTS, []);
    return cached;
  });
  // 初始 alertStats 也从缓存告警计算，保证和列表初始状态一致
  const [alertStats, setAlertStats] = useState<AlertStats | null>(() => {
    const cached = readLS<MonitoringAlert[]>(LS_ALERTS, []);
    if (cached.length === 0) return null;
    let critical = 0, warning = 0, info = 0;
    for (const a of cached) {
      if (a.level === 'critical') critical++;
      else if (a.level === 'warning') warning++;
      else info++;
    }
    return {
      total: cached.length,
      active: cached.length,
      active_critical: critical,
      active_warning: warning,
      active_info: info,
      acknowledged: 0,
      resolved: 0,
      closed: 0,
    };
  });
  const [alarmTrend, setAlarmTrend] = useState<TrendPoint[]>(() => {
    const cached = readLS<TrendPoint[]>(LS_TREND, []);
    return cached.length > 0 ? cached : buildTrendSkeleton(14);
  });
  const [taskStats, setTaskStats] = useState<TaskStats>({
    running: 0,
    success: 0,
    failed: 0,
    pending: 0,
  });
  const [taskDevices, setTaskDevices] = useState<TaskDevice[]>([]);
  const [schedulerRunning, setSchedulerRunning] = useState(false);
  const [rules, setRules] = useState<any[]>([]);
  const [loading, setLoading] = useState(false);
  const loadingRef = useRef(false);
  // 用 ref 存最新的 hosts/keys，避免闭包陷阱
  const hostsRef = useRef(hosts);
  const keysRef = useRef(keys);
  hostsRef.current = hosts;
  keysRef.current = keys;

  // 浏览器远程访问环境：从 /api/devices 构建虚拟 hosts 列表（Electron vault 不可用）
  const [remoteHosts, setRemoteHosts] = useState<Host[]>([]);
  const IS_REMOTE = typeof window !== "undefined" && !!(window as any).__REMOTE_TOKEN__;
  const REMOTE_TOKEN = (window as any).__REMOTE_TOKEN__ || "";

  // Electron 本地：同步 vault hosts 给主进程（供远程浏览器 API 读）
  useEffect(() => {
    if (IS_REMOTE) return; // 远程浏览器不触发
    const nc = (window as any).netcatty;
    if (!nc?.inspection) return;
    if (hosts.length === 0) return;
    console.log('[useMonitoringData] syncing vault hosts to main process:', hosts.length);
    nc.inspection.saveVaultHosts(hosts).then((r: any) => {
      console.log('[useMonitoringData] saveVaultHosts result:', r);
    }).catch((e: any) => {
      console.warn('[useMonitoringData] saveVaultHosts error:', e);
    });
  }, [hosts, IS_REMOTE]);

  useEffect(() => {
    if (!IS_REMOTE) return;
    console.log('[monitoring] REMOTE ENV - props.hosts.length=', hosts.length, 'remoteHosts.length=', remoteHosts.length);
    if (hosts.length > 0) {
      console.warn('[monitoring] REMOTE ENV 但 props.hosts 有值！跳过 remote hosts 加载，hosts[0]=', hosts[0]);
      return;
    }
    const loadRemoteHosts = async () => {
      try {
        const res = await fetch(`/api/devices?token=${encodeURIComponent(REMOTE_TOKEN)}`);
        const data = await res.json();
        const list: Host[] = (data.devices || []).map((d: any) => ({
          id: d.host_id,
          label: d.label || d.name || d.hostname || d.host_id,
          hostname: d.hostname || d.name || "",
          port: 22,
          username: "",
          distro: d.distro || d.catalog_type || d.catalog_id || "",
          type: d.type || "",
          catalogId: d.catalog_id || "",
          tags: [],
          os: "linux" as const,
          group: "",
        }));
        setRemoteHosts(list);
        hostsRef.current = list;
      } catch (e) {
        console.warn("[monitoring] remote hosts load failed:", e);
      }
    };
    void loadRemoteHosts();
  }, [IS_REMOTE, REMOTE_TOKEN, hosts.length]);

  // 实际使用的 hosts：Electron 用 props，浏览器用远程加载的
  const effectiveHosts = IS_REMOTE && hosts.length === 0 ? remoteHosts : hosts;

  const refresh = useCallback(async (silent = false) => {
    if (loadingRef.current) {
      console.log('[monitoring] refresh() 正在执行中，跳过');
      return;
    }
    loadingRef.current = true;
    if (!silent) setLoading(true);
    try {
      // ===== 1. 巡检最新结果 → CPU / 内存 / 在线状态 / 成功失败统计 =====
      let latestResults: InspectionResult[] = [];
      try {
        const results: InspectionResult[] = await inspectionResultApi.getLatestAll();
        latestResults = results;
        const newCpu: Record<string, number> = {};
        const newMem: Record<string, number> = {};
        const newOnline: Record<string, boolean> = {};
        const newTimestamps: Record<string, number> = {};
        let successCount = 0;
        let failedCount = 0;

        for (const r of results) {
          const cpu = extractCpu(r.metrics);
          const mem = extractMem(r.metrics);
          newCpu[r.device_id] = cpu;
          newMem[r.device_id] = mem;
          newOnline[r.device_id] = r.online !== false;
          newTimestamps[r.device_id] = r.timestamp;
          if (r.status === 'success') successCount++;
          else failedCount++;
          // 调试：打印每台设备的 metrics 结构，方便排查字段
          console.log(`[monitoring] device ${r.device_id}: cpu=${cpu}, mem=${mem}, metrics keys=`, Object.keys(r.metrics || {}));
        }

        console.log(`[monitoring] loaded ${results.length} results: cpuMap=`, Object.keys(newCpu).length, 'memMap=', Object.keys(newMem).length);

        setCpuMap((prev) => {
          const merged = { ...prev, ...newCpu };
          writeLS(LS_CPU, merged);
          return merged;
        });
        setMemMap((prev) => {
          const merged = { ...prev, ...newMem };
          writeLS(LS_MEM, merged);
          return merged;
        });
        setOnlineMap((prev) => ({ ...prev, ...newOnline }));
        setTimestampMap((prev) => ({ ...prev, ...newTimestamps }));
        setTaskStats((prev) => ({ ...prev, success: successCount, failed: failedCount }));
      } catch (e) {
        console.log('[monitoring] getLatestAll failed, using cached:', e);
      }

      // ===== 2. 活动告警（统一数据源：列表、概览、计数都从 active 列表里统计）=====
      try {
        const active: AlertRecord[] = await inspectionAlertApi.getActive();
        console.log('[monitoring] getActive 返回:', active.length, '条告警');

        const mapped: MonitoringAlert[] = active.map((a) => ({
          id: a.id,
          deviceId: a.device_id,
          deviceName: a.device_name,
          level: mapLevel(a.level),
          message: a.message || a.rule_name,
          time: formatAlertTime(a.triggered_at),
          metric: a.metric,
          metricValue: a.metric_value,
          threshold: a.threshold,
        }));
        setAlerts(mapped);
        writeLS(LS_ALERTS, mapped);

        // 统一从 active 列表统计告警计数（和列表、概览保持完全一致）
        let activeCritical = 0;
        let activeWarning = 0;
        let activeInfo = 0;
        for (const a of active) {
          if (a.level === 'critical') activeCritical++;
          else if (a.level === 'warning') activeWarning++;
          else activeInfo++;
        }
        setAlertStats({
          total: active.length, // 用活动告警总数，不是历史总告警
          active: active.length,
          active_critical: activeCritical,
          active_warning: activeWarning,
          active_info: activeInfo,
          acknowledged: 0,
          resolved: 0,
          closed: 0,
        });

        // 趋势：拉最近 200 条历史告警算 14 天趋势
        try {
          const all = await inspectionAlertApi.list({ limit: 200 });
          const trend = buildTrendFromAlerts(all, 14);
          // 浅比较：数据没变化就不 setState，避免触发无意义重渲
          setAlarmTrend((prev) => {
            if (prev.length === trend.length && prev.every((p, i) => p.date === trend[i].date && p.count === trend[i].count)) return prev;
            return trend;
          });
          writeLS(LS_TREND, trend);
        } catch { /* 忽略趋势拉取失败 */ }
      } catch (e) {
        console.log('[monitoring] alerts failed:', e);
      }

      // ===== 3. 调度器状态 + 设备扩展 + 告警规则 → 任务统计 + 任务设备列表 + thresholds =====
      try {
        const [schedulerStatus, enabledDevices, allExtensions, rulesResult] = await Promise.all([
          inspectionSchedulerApi.status(),
          inspectionDeviceApi.getEnabled(),
          inspectionDeviceApi.getAll(),
          inspectionAlertRuleApi.list().catch(() => []),
        ]);

        setRules(rulesResult || []);

        setSchedulerRunning(schedulerStatus.running);
        const running = schedulerStatus.active_scans || 0;

        // 构建结果 map
        const resultMap = new Map(latestResults.map((r) => [r.device_id, r]));

        // 构建所有设备的任务状态列表（过滤掉没有 hostname 的无效设备）
        const allExtList = Object.values(allExtensions || {});
        const taskDeviceList: TaskDevice[] = allExtList
          .map((ext) => {
            const host = hostsRef.current.find((h) => h.id === ext.host_id);
            const result = resultMap.get(ext.host_id);
            const isEnabled = ext.inspection_enabled;
            
            // 没有 hostname 的设备（配置不完整），过滤掉
            if (!host?.hostname) return null;

            let status: TaskDevice['status'];
            if (isEnabled) {
              // 启用了定时巡检
              if (result) {
                if (result.status === 'success') status = 'success';
                else status = 'failed';
              } else {
                // 启用了但还没巡检过 → 归为成功（表示已配置）
                status = 'success';
              }
            } else {
              // 未启用定时巡检 → 待执行
              status = 'pending';
            }

            return {
              deviceId: ext.host_id,
              deviceName: host?.label || host?.hostname || ext.host_id,
              ip: host?.hostname || '',
              status,
              lastScanAt: result?.timestamp,
              durationMs: result?.duration_ms,
              errorMessage: result?.error_message || undefined,
              interval: ext.inspection_interval || undefined,
              inspectionEnabled: isEnabled,
            };
          })
          .filter((d): d is TaskDevice => d !== null);

        // 统计：执行中=启用巡检的设备数，成功/失败是其中的子集，待执行=未启用的
        const enabledTaskDevices = taskDeviceList.filter((d) => d.inspectionEnabled);
        const runningCount = enabledTaskDevices.length;
        const successCount = enabledTaskDevices.filter((d) => d.status === 'success').length;
        const failedCount = enabledTaskDevices.filter((d) => d.status === 'failed').length;
        const pendingCount = taskDeviceList.filter((d) => !d.inspectionEnabled).length;

        console.log('[monitoring] 任务统计:', { running: runningCount, success: successCount, failed: failedCount, pending: pendingCount, total: taskDeviceList.length });
        console.log('[monitoring] 启用巡检设备数:', enabledTaskDevices.length, '全部扩展设备数:', allExtList.length, '巡检结果数:', latestResults.length);

        setTaskDevices(taskDeviceList);
        setTaskStats({
          running: runningCount,
          success: successCount,
          failed: failedCount,
          pending: pendingCount,
        });

        // 自动启动调度器
        if (enabledDevices.length === 0) {
          console.log('[monitoring] 没有启用巡检的设备');
        } else {
          console.log('[monitoring] 条件满足，准备启动调度器');
          try {
            const hostConfigs: Record<string, Record<string, unknown>> = {};
            const allExt = allExtensions || {};
            for (const [hostId, ext] of Object.entries(allExt)) {
              if (!ext || !ext.inspection_enabled) continue;
              const host = hostsRef.current.find((h) => h.id === hostId);
              if (!host) {
                console.log('[monitoring] vault 中未找到 host_id:', hostId, '，跳过');
                continue;
              }
              if (!host.username) {
                console.log('[monitoring] 设备', host.label || host.hostname || hostId, '缺少 username，跳过');
                continue;
              }
              hostConfigs[hostId] = buildSshConfig(host, keysRef.current);
            }
            // 诊断：打印 hostConfigs 样本看 label 有没有正确传递
            const sample = Object.entries(hostConfigs).slice(0, 3).map(([id, c]) => ({ id, label: c.label, host: c.host, username: c.username }));
            console.log('[monitoring] hostConfigs 样本:', JSON.stringify(sample));
            if (Object.keys(hostConfigs).length === 0) {
              console.log('[monitoring] 没有可巡检的设备（vault 中匹配不到或凭据不完整）');
            } else {
              console.log('[monitoring] 启动调度器，匹配到', Object.keys(hostConfigs).length, '台设备（running=' + schedulerStatus.running + '）');
              // 不管 running 与否都传 hostConfigs 过去让主进程更新，
              // 主进程 execFn 通过模块级 _hostConfigs 引用动态读最新值
              await inspectionSchedulerApi.start(hostConfigs);
              setSchedulerRunning(true);
            }
          } catch (e) {
            console.log('[monitoring] 自动启动调度器失败:', e);
          }
        }
      } catch (e) {
        console.log('[monitoring] scheduler status failed:', e);
      }
    } finally {
      loadingRef.current = false;
      if (!silent) setLoading(false);
    }
  }, []);

  // 初始加载 + 定期刷新（每 30 秒）
  useEffect(() => {
    refresh(false);
    const id = setInterval(() => refresh(true), 30000);
    return () => clearInterval(id);
  }, [refresh]);

  // 事件驱动：告警变化立即刷新（静默刷新，不显示 loading 避免闪动）
  useEffect(() => {
    const api = (window as any).netcatty?.inspection;
    if (!api?.onAlertChanged) return;
    // 前端侧 500ms debounce
    let timer: ReturnType<typeof setTimeout> | null = null;
    const handler = () => {
      if (timer) clearTimeout(timer);
      timer = setTimeout(() => refresh(true), 500);
    };
    const unsub = api.onAlertChanged(handler);
    return () => {
      if (timer) clearTimeout(timer);
      try { unsub?.(); } catch (_) {}
    };
  }, [refresh]);

  // 规则变化 → 立刻 refresh（让 thresholds 同步）
  useEffect(() => {
    const api = (window as any).netcatty?.inspection;
    if (!api?.onRuleChanged) return;
    const handler = () => refresh(true);
    const unsub = api.onRuleChanged(handler);
    return () => { try { unsub?.(); } catch (_) {} };
  }, [refresh]);

  // hosts 变化时，把在线状态默认设为 true（没巡检数据前）
  useEffect(() => {
    setOnlineMap((prev) => {
      const next: Record<string, boolean> = { ...prev };
      let changed = false;
      for (const h of effectiveHosts) {
        if (next[h.id] === undefined) {
          next[h.id] = true; // 假设在线，等巡检结果覆盖
          changed = true;
        }
      }
      return changed ? next : prev;
    });
  }, [effectiveHosts]);

  // 从告警规则派生阈值（和 alertRuleStore 默认规则对齐）
  const thresholds = useMemo(() => {
    let cpuCritical = 90, cpuWarning = 80;
    let memCritical = 85, memWarning = 75;
    let diskCritical = 90, diskWarning = 80;
    for (const r of rules) {
      if (!r.enabled) continue;
      // 排除 scope_type='catalog' 的设备专属规则（会覆盖全局通用规则）
      if (r.scope_type && r.scope_type !== 'all') continue;
      const t = Number(r.threshold);
      if (Number.isNaN(t)) continue;
      if (r.metric === 'cpu_usage') {
        if (r.level === 'critical') cpuCritical = t;
        else if (r.level === 'warning') cpuWarning = t;
      } else if (r.metric === 'memory_usage') {
        if (r.level === 'critical') memCritical = t;
        else if (r.level === 'warning') memWarning = t;
      } else if (r.metric === 'disk_usage') {
        if (r.level === 'critical') diskCritical = t;
        else if (r.level === 'warning') diskWarning = t;
      }
    }
    return { cpuCritical, cpuWarning, memCritical, memWarning, diskCritical, diskWarning };
  }, [rules]);

  return {
    cpuMap,
    memMap,
    onlineMap,
    timestampMap,
    alerts,
    alarmTrend,
    alertStats,
    taskStats,
    taskDevices,
    schedulerRunning,
    rules,
    thresholds,
    refresh,
    loading,
    effectiveHosts,
  };
}