const express = require('express');
const router = express.Router();
const { initializeMonitor, cleanupMonitor } = require('../utils/systemMonitor');

// 存储监控服务的状态
let monitorStatus = {
  isInitialized: false,
  domainId: null,
  lastError: null,
  activeMonitors: new Set() // 添加活跃监控器集合
};

// 初始化监控服务
router.post('/initialize', async (req, res) => {
  try {
    const { domainId, monitorId } = req.body;
    
    if (!domainId || !monitorId) {
      return res.status(400).json({ error: '缺少必要的参数' });
    }

    // 如果已经初始化，检查是否是新的监控器
    if (monitorStatus.isInitialized) {
      if (monitorStatus.domainId !== domainId) {
        return res.status(400).json({ error: 'DDS域ID不匹配' });
      }
      monitorStatus.activeMonitors.add(monitorId);
      return res.json({ 
        message: '监控器已注册',
        status: monitorStatus
      });
    }

    // 首次初始化
    const result = initializeMonitor(domainId);
    if (result && result.includes('失败')) {
      monitorStatus.lastError = result;
      return res.status(500).json({ error: result });
    }

    monitorStatus.isInitialized = true;
    monitorStatus.domainId = domainId;
    monitorStatus.lastError = null;
    monitorStatus.activeMonitors.add(monitorId);

    res.json({ 
      message: '监控服务初始化成功',
      status: monitorStatus
    });
  } catch (error) {
    console.error('初始化监控服务失败:', error);
    monitorStatus.lastError = error.message;
    res.status(500).json({ error: '初始化监控服务失败', message: error.message });
  }
});

// 注销监控器
router.post('/unregister', async (req, res) => {
  try {
    const { monitorId } = req.body;
    
    if (!monitorId) {
      return res.status(400).json({ error: '缺少必要的monitorId参数' });
    }

    monitorStatus.activeMonitors.delete(monitorId);

    // 如果没有活跃的监控器了，清理资源
    if (monitorStatus.activeMonitors.size === 0) {
      cleanupMonitor();
      monitorStatus = {
        isInitialized: false,
        domainId: null,
        lastError: null,
        activeMonitors: new Set()
      };
    }

    res.json({ 
      message: '监控器注销成功',
      status: monitorStatus
    });
  } catch (error) {
    console.error('注销监控器失败:', error);
    res.status(500).json({ error: '注销监控器失败', message: error.message });
  }
});

// 获取监控服务状态
router.get('/status', (req, res) => {
  res.json(monitorStatus);
});

module.exports = router;