const axios = require('axios');
const { HttpsProxyAgent } = require('https-proxy-agent');
const { SocksProxyAgent } = require('socks-proxy-agent');
const { HttpProxyAgent } = require('http-proxy-agent');
const logger = require('../utils/logger');
const { TestResult } = require('../models');
const net = require('net');
const { exec } = require('child_process');

class SpeedTester {
  constructor() {
    this.testUrls = process.env.SPEED_TEST_URLS?.split(',') || [
      'https://www.google.com',
      'https://www.youtube.com',
      'https://www.github.com',
      'https://httpbin.org/get'
    ];
    this.timeout = parseInt(process.env.SPEED_TEST_TIMEOUT) || 10000;
  }

  /**
   * TCP端口连通性检测 - 使用tcp-ping库改进
   */
  async testTcpConnectivity(server, port, timeout = 5000) {
    return new Promise((resolve) => {
      try {
        // 尝试使用tcp-ping库，如果不可用则回退到原生实现
        const tcpPing = require('tcp-ping');
        tcpPing.ping({
          address: server,
          port: port,
          attempts: 3,
          timeout: timeout
        }, (err, data) => {
          if (err) {
            logger.warn(`tcp-ping库不可用，使用原生实现: ${err.message}`);
            this.testTcpConnectivityNative(server, port, timeout).then(resolve);
            return;
          }
          
          if (data && data.min !== undefined) {
            // tcp-ping库返回的时间单位是秒，需要转换为毫秒
            resolve({ 
              success: true, 
              latency: Math.round(data.min * 1000),
              avg: Math.round(data.avg * 1000),
              max: Math.round(data.max * 1000),
              min: Math.round(data.min * 1000)
            });
          } else {
            resolve({ success: false, error: '连接失败', latency: -1 });
          }
        });
      } catch (error) {
        logger.warn(`tcp-ping库加载失败，使用原生实现: ${error.message}`);
        this.testTcpConnectivityNative(server, port, timeout).then(resolve);
      }
    });
  }

  /**
   * 原生TCP连通性检测（备用方案）
   */
  async testTcpConnectivityNative(server, port, timeout = 5000) {
    return new Promise((resolve) => {
      const socket = new net.Socket();
      let isConnected = false;
      const startTime = Date.now();

      socket.setTimeout(timeout);

      socket.on('connect', () => {
        isConnected = true;
        const latency = Date.now() - startTime;
        socket.destroy();
        resolve({ 
          success: true, 
          latency: latency,
          avg: latency,
          max: latency,
          min: latency
        });
      });

      socket.on('timeout', () => {
        socket.destroy();
        if (!isConnected) resolve({ 
          success: false, 
          error: '连接超时',
          latency: -1
        });
      });

      socket.on('error', (err) => {
        socket.destroy();
        if (!isConnected) resolve({ 
          success: false, 
          error: err.message,
          latency: -1
        });
      });

      socket.connect(port, server);
    });
  }

  /**
   * 使用系统 ping 命令测真实网络延迟（ICMP RTT）
   * 支持 Windows 和 Linux
   */
  async systemPing(host, attempts = 3, timeout = 2000) {
    return new Promise((resolve) => {
      // 判断平台
      const isWin = process.platform === 'win32';
      // Windows: ping -n 次数 -w 超时 host
      // Linux/Mac: ping -c 次数 -W 超时 host
      let cmd;
      if (isWin) {
        // -n 次数, -w 单次超时(毫秒)
        cmd = `ping -n ${attempts} -w ${timeout} ${host}`;
      } else {
        // -c 次数, -W 单次超时(秒)
        cmd = `ping -c ${attempts} -W ${Math.ceil(timeout/1000)} ${host}`;
      }
      exec(cmd, (error, stdout) => {
        if (error) {
          resolve({ success: false, error: error.message, raw: stdout });
          return;
        }
        let avg, min, max, results = [];
        if (isWin) {
          // 解析每次延迟
          const msMatches = [...stdout.matchAll(/时间[=<]([\d]+)ms/g)];
          results = msMatches.map((m, i) => ({ seq: i+1, time: parseInt(m[1], 10) }));
          // 解析统计
          const statMatch = stdout.match(/平均 = (\d+)ms/);
          avg = statMatch ? parseInt(statMatch[1], 10) : null;
          const minMatch = stdout.match(/最短 = (\d+)ms/);
          min = minMatch ? parseInt(minMatch[1], 10) : null;
          const maxMatch = stdout.match(/最长 = (\d+)ms/);
          max = maxMatch ? parseInt(maxMatch[1], 10) : null;
        } else {
          // 解析每次延迟
          const msMatches = [...stdout.matchAll(/time=([\d.]+) ms/g)];
          results = msMatches.map((m, i) => ({ seq: i+1, time: Math.round(parseFloat(m[1])) }));
          // 解析统计
          const statMatch = stdout.match(/min\/avg\/max\/.* = ([\d.]+)\/([\d.]+)\/([\d.]+)\//);
          min = statMatch ? Math.round(parseFloat(statMatch[1])) : null;
          avg = statMatch ? Math.round(parseFloat(statMatch[2])) : null;
          max = statMatch ? Math.round(parseFloat(statMatch[3])) : null;
        }
        if (avg != null) {
          resolve({ success: true, host, avg, min, max, attempts, results, raw: stdout });
        } else {
          resolve({ success: false, error: '无法解析ping输出', raw: stdout });
        }
      });
    });
  }

  /**
   * 核心ping测速实现 - 参考Electron应用的方式
   * 使用tcp-ping库进行精确的延迟测量
   */
  async pingHosts(host, port, attempts = 3, timeout = 2000) {
    return new Promise((resolve) => {
      try {
        const tcpPing = require('tcp-ping');
        tcpPing.ping({
          address: host,
          port: port,
          attempts: attempts,
          timeout: timeout
        }, (err, data) => {
          if (err) {
            logger.warn(`tcp-ping测速失败: ${host}:${port} - ${err.message}`);
            resolve({ success: false, latency: -1, error: err.message });
            return;
          }
          
          if (data && data.min !== undefined) {
            // tcp-ping返回的时间单位是秒，转换为毫秒
            const result = {
              success: true,
              host: host,
              port: port,
              attempts: data.attempts,
              avg: Math.round(data.avg * 1000),
              max: Math.round(data.max * 1000),
              min: Math.round(data.min * 1000),
              latency: Math.round(data.min * 1000), // 使用最小延迟作为主要延迟值
              results: data.results.map(r => ({
                seq: r.seq,
                time: Math.round(r.time * 1000)
              }))
            };
            
            logger.debug(`ping测速成功: ${host}:${port} - 延迟: ${result.latency}ms (平均: ${result.avg}ms, 最大: ${result.max}ms)`);
            resolve(result);
          } else {
            logger.warn(`ping测速失败: ${host}:${port} - 连接失败`);
            resolve({ success: false, latency: -1, error: '连接失败' });
          }
        });
      } catch (error) {
        logger.warn(`tcp-ping库不可用，使用原生实现: ${error.message}`);
        this.pingHostsNative(host, port, attempts, timeout).then(resolve);
      }
    });
  }

  /**
   * 原生TCP ping实现（备用方案）
   */
  async pingHostsNative(host, port, attempts = 3, timeout = 2000) {
    const results = [];
    
    for (let i = 0; i < attempts; i++) {
      try {
        const result = await this.singlePing(host, port, timeout);
        if (result.success) {
          results.push(result.latency);
        }
      } catch (error) {
        logger.debug(`单次ping失败: ${host}:${port} - 第${i+1}次尝试`);
      }
    }
    
    if (results.length > 0) {
      const min = Math.min(...results);
      const max = Math.max(...results);
      const avg = results.reduce((a, b) => a + b, 0) / results.length;
      
      return {
        success: true,
        host: host,
        port: port,
        attempts: attempts,
        avg: Math.round(avg),
        max: max,
        min: min,
        latency: min, // 使用最小延迟
        results: results.map((latency, index) => ({ seq: index + 1, time: latency }))
      };
    } else {
      return {
        success: false,
        host: host,
        port: port,
        latency: -1,
        error: '所有尝试都失败'
      };
    }
  }

  /**
   * 单次ping测试
   */
  async singlePing(host, port, timeout) {
    return new Promise((resolve) => {
      const socket = new net.Socket();
      let isConnected = false;
      const startTime = Date.now();

      socket.setTimeout(timeout);

      socket.on('connect', () => {
        isConnected = true;
        const latency = Date.now() - startTime;
        socket.destroy();
        resolve({ success: true, latency: latency });
      });

      socket.on('timeout', () => {
        socket.destroy();
        if (!isConnected) resolve({ success: false, error: '连接超时' });
      });

      socket.on('error', (err) => {
        socket.destroy();
        if (!isConnected) resolve({ success: false, error: err.message });
      });

      socket.connect(port, host);
    });
  }

  /**
   * 批量ping测速 - 改进版
   * 提供更精细的并发控制和更好的错误处理
   */
  async batchPingHosts(hosts, options = {}) {
    const {
      concurrency = 3,        // 降低默认并发数
      batchDelay = 2000,      // 增加批次间延迟
      retryAttempts = 1,      // 失败重试次数
      timeout = 3000,         // 增加超时时间
      attempts = 3            // 每次ping的尝试次数
    } = options;

    logger.info(`开始批量ping测速: ${hosts.length}个节点，并发数: ${concurrency}`);
    
    const results = [];
    const startTime = Date.now();
    
    // 分批处理，控制并发数
    for (let i = 0; i < hosts.length; i += concurrency) {
      const batch = hosts.slice(i, i + concurrency);
      logger.debug(`处理批次 ${Math.floor(i/concurrency) + 1}/${Math.ceil(hosts.length/concurrency)}: ${batch.length}个节点`);
      
      const batchPromises = batch.map(async (hostConfig, batchIndex) => {
        const { host, port } = hostConfig;
        const nodeName = `${host}:${port}`;
        
        // 添加随机延迟，避免同时发起请求
        const randomDelay = Math.random() * 500;
        await new Promise(resolve => setTimeout(resolve, randomDelay));
        
        let lastError = null;
        
        // 重试机制
        for (let retry = 0; retry <= retryAttempts; retry++) {
          try {
            const result = await this.pingHosts(host, port, attempts, timeout);
            return { 
              host, 
              port, 
              ...result,
              retryCount: retry,
              batchIndex: batchIndex
            };
          } catch (error) {
            lastError = error;
            logger.debug(`ping测速失败 (重试 ${retry + 1}/${retryAttempts + 1}): ${nodeName} - ${error.message}`);
            
            if (retry < retryAttempts) {
              // 重试前等待
              await new Promise(resolve => setTimeout(resolve, 1000 * (retry + 1)));
            }
          }
        }
        
        // 所有重试都失败
        logger.warn(`ping测速最终失败: ${nodeName} - ${lastError?.message || '未知错误'}`);
        return { 
          host, 
          port, 
          success: false, 
          error: lastError?.message || '所有重试都失败',
          latency: -1,
          retryCount: retryAttempts,
          batchIndex: batchIndex
        };
      });
      
      const batchResults = await Promise.allSettled(batchPromises);
      
      batchResults.forEach((result, index) => {
        if (result.status === 'fulfilled') {
          results.push(result.value);
        } else {
          logger.error(`ping测速异常: ${batch[index].host}:${batch[index].port} - ${result.reason}`);
          results.push({
            host: batch[index].host,
            port: batch[index].port,
            success: false,
            error: result.reason,
            latency: -1,
            retryCount: 0,
            batchIndex: index
          });
        }
      });
      
      // 批次间延迟，避免过于频繁的请求
      if (i + concurrency < hosts.length) {
        logger.debug(`批次间延迟: ${batchDelay}ms`);
        await new Promise(resolve => setTimeout(resolve, batchDelay));
      }
    }
    
    // 按延迟排序
    const sortedResults = results.sort((a, b) => {
      if (a.success && b.success) {
        return (a.latency || a.min || 9999) - (b.latency || b.min || 9999);
      }
      return a.success ? -1 : 1;
    });
    
    const successCount = sortedResults.filter(r => r.success).length;
    const totalTime = Date.now() - startTime;
    
    logger.info(`批量ping测速完成: ${successCount}/${hosts.length}个节点连通，总耗时: ${totalTime}ms`);
    
    return {
      results: sortedResults,
      summary: {
        total: results.length,
        successful: successCount,
        failed: results.length - successCount,
        avgLatency: sortedResults
          .filter(r => r.success && r.latency)
          .reduce((sum, r) => sum + r.latency, 0) / sortedResults.filter(r => r.success && r.latency).length || 0,
        totalTime: totalTime,
        concurrency: concurrency,
        batchDelay: batchDelay
      }
    };
  }

  /**
   * 单次测速 - 优化版
   * 提供更精确的单节点测速
   */
  async singlePingOptimized(host, port, options = {}) {
    const {
      attempts = 5,           // 增加尝试次数
      timeout = 5000,         // 增加超时时间
      interval = 500          // 尝试间隔
    } = options;

    logger.info(`开始单次优化测速: ${host}:${port}`);
    
    const results = [];
    const startTime = Date.now();
    
    for (let i = 0; i < attempts; i++) {
      try {
        const result = await this.singlePing(host, port, timeout);
        if (result.success) {
          results.push(result.latency);
          logger.debug(`第${i + 1}次尝试成功: ${result.latency}ms`);
        } else {
          logger.debug(`第${i + 1}次尝试失败: ${result.error}`);
        }
      } catch (error) {
        logger.debug(`第${i + 1}次尝试异常: ${error.message}`);
      }
      
      // 尝试间隔
      if (i < attempts - 1) {
        await new Promise(resolve => setTimeout(resolve, interval));
      }
    }
    
    if (results.length > 0) {
      const min = Math.min(...results);
      const max = Math.max(...results);
      const avg = results.reduce((a, b) => a + b, 0) / results.length;
      const totalTime = Date.now() - startTime;
      
      logger.info(`单次优化测速完成: ${host}:${port} - 延迟: ${min}ms (平均: ${Math.round(avg)}ms, 最大: ${max}ms)`);
      
      return {
        success: true,
        host: host,
        port: port,
        attempts: attempts,
        avg: Math.round(avg),
        max: max,
        min: min,
        latency: min,
        results: results.map((latency, index) => ({ seq: index + 1, time: latency })),
        totalTime: totalTime
      };
    } else {
      const totalTime = Date.now() - startTime;
      logger.warn(`单次优化测速失败: ${host}:${port} - 所有尝试都失败`);
      
      return {
        success: false,
        host: host,
        port: port,
        attempts: attempts,
        latency: -1,
        error: '所有尝试都失败',
        totalTime: totalTime
      };
    }
  }

  /**
   * 测试单个节点连通性（改进版）
   */
  async testNode(node) {
    const startTime = Date.now();
    let testResult = {
      nodeId: node.id,
      testTime: new Date(),
      isSuccess: false,
      latency: null,
      downloadSpeed: null, // 保留字段但不测试
      uploadSpeed: null,   // 保留字段但不测试
      packetLoss: null,
      testUrl: null,
      errorMessage: null,
      testDuration: null,
      ipAddress: null,
      location: null,
      pingStats: null // 新增ping统计信息
    };

    try {
      logger.info(`开始测试节点连通性: ${node.name} (${node.type})`);

      // 验证节点配置的有效性
      const validationResult = this.validateNode(node);
      if (!validationResult.isValid) {
        throw new Error(validationResult.error);
      }

              // 使用高级ping测试
        const pingResult = await this.pingHosts(node.server, node.port, 3, 2000);
      testResult.isSuccess = pingResult.success;
      testResult.latency = pingResult.min || pingResult.latency;
      testResult.errorMessage = pingResult.error || null;
      testResult.pingStats = pingResult.success ? {
        attempts: pingResult.attempts,
        avg: pingResult.avg,
        max: pingResult.max,
        min: pingResult.min,
        results: pingResult.results
      } : null;

      testResult.testDuration = Date.now() - startTime;

      if (testResult.isSuccess) {
        logger.info(`✅ 节点Ping测试成功: ${node.name} - 延迟: ${testResult.latency}ms (平均: ${pingResult.avg}ms, 最大: ${pingResult.max}ms)`);
      } else {
        logger.warn(`❌ 节点Ping测试失败: ${node.name} - ${testResult.errorMessage || '连接超时'}`);
      }
    } catch (error) {
      testResult.errorMessage = error.message;
      testResult.testDuration = Date.now() - startTime;
      logger.error(`❌ 节点测试异常: ${node.name} - ${error.message}`);
    }

    // 保存测试结果
    await this.saveTestResult(testResult);

    return testResult;
  }

  /**
   * 验证节点配置的有效性
   */
  validateNode(node) {
    // 检查必需的字段
    if (!node.name) {
      return { isValid: false, error: '节点名称不能为空' };
    }
    
    if (!node.type) {
      return { isValid: false, error: '节点类型不能为空' };
    }
    
    if (!node.server) {
      return { isValid: false, error: '服务器地址不能为空' };
    }
    
    if (!node.port || node.port <= 0 || node.port > 65535) {
      return { isValid: false, error: '端口号无效' };
    }

    // 验证server字段是否为有效的域名或IP地址
    const server = node.server.trim();
    
    // 检查是否为空或只包含空白字符
    if (!server || server.trim() === '') {
      return { isValid: false, error: '服务器地址不能为空' };
    }
    
    // 检查是否是URL格式（不应该作为server地址）
    if (server.startsWith('http://') || server.startsWith('https://')) {
      return { isValid: false, error: `服务器地址不能是URL格式: ${server}` };
    }
    
    // 检查是否包含明显的无效字符（如空格、特殊符号等）
    if (/[<>:"\\|?*]/.test(server)) {
      return { isValid: false, error: `服务器地址包含无效字符: ${server}` };
    }
    
    // 允许包含中文的服务器地址
    if (/[\u4e00-\u9fa5]/.test(server)) {
      // 包含中文的地址直接通过验证
      logger.debug(`检测到包含中文的服务器地址: ${server}`);
    } else {
      // 对于不包含中文的域名，进行基本的域名格式验证
      if (!this.isValidBasicDomain(server)) {
        return { isValid: false, error: `服务器地址格式无效: ${server}` };
      }
    }

    // 对于SS/SSR节点，检查密码
    if ((node.type === 'ss' || node.type === 'ssr') && !node.password) {
      return { isValid: false, error: 'SS/SSR节点必须设置密码' };
    }

    // 对于Vmess节点，检查UUID
    if (node.type === 'vmess' && !node.uuid) {
      return { isValid: false, error: 'Vmess节点必须设置UUID' };
    }

    // 对于Trojan节点，检查密码
    if (node.type === 'trojan' && !node.password) {
      return { isValid: false, error: 'Trojan节点必须设置密码' };
    }

    return { isValid: true, error: null };
  }

  /**
   * 验证是否为合法的中文域名
   * 支持以下格式：
   * - 纯中文域名：中文.域名.com
   * - 混合域名：中文.example.com
   * - 包含中文的域名：test.中文.com
   */
  isValidChineseDomain(domain) {
    // 移除前后空格
    domain = domain.trim();
    
    // 检查是否包含中文字符
    if (!/[\u4e00-\u9fa5]/.test(domain)) {
      return false;
    }
    
    // 检查是否包含域名分隔符（点号）
    if (!domain.includes('.')) {
      return false;
    }
    
    // 检查是否以点号开头或结尾
    if (domain.startsWith('.') || domain.endsWith('.')) {
      return false;
    }
    
    // 检查是否包含连续的点号
    if (domain.includes('..')) {
      return false;
    }
    
    // 检查每个标签的长度（域名标签不能超过63个字符）
    const labels = domain.split('.');
    for (const label of labels) {
      if (label.length === 0 || label.length > 63) {
        return false;
      }
    }
    
    // 检查顶级域名（最后一部分）是否至少包含一个非中文字符
    const tld = labels[labels.length - 1];
    if (!/[a-zA-Z0-9]/.test(tld)) {
      return false;
    }
    
    // 检查是否包含有效的域名字符（中文、英文、数字、连字符）
    const validDomainRegex = /^[a-zA-Z0-9\u4e00-\u9fa5\-\.]+$/;
    if (!validDomainRegex.test(domain)) {
      return false;
    }
    
    return true;
  }

  /**
   * 验证是否为合法的基本域名格式（不包含中文）
   */
  isValidBasicDomain(domain) {
    // 移除前后空格
    domain = domain.trim();
    
    // 检查是否包含域名分隔符（点号）
    if (!domain.includes('.')) {
      return false;
    }
    
    // 检查是否以点号开头或结尾
    if (domain.startsWith('.') || domain.endsWith('.')) {
      return false;
    }
    
    // 检查是否包含连续的点号
    if (domain.includes('..')) {
      return false;
    }
    
    // 检查每个标签的长度（域名标签不能超过63个字符）
    const labels = domain.split('.');
    for (const label of labels) {
      if (label.length === 0 || label.length > 63) {
        return false;
      }
    }
    
    // 检查是否包含有效的域名字符（英文、数字、连字符）
    const validDomainRegex = /^[a-zA-Z0-9\-\.]+$/;
    if (!validDomainRegex.test(domain)) {
      return false;
    }
    
    return true;
  }

  /**
   * 创建代理配置
   */
  createProxyConfig(node) {
    const baseConfig = {
      host: node.server,
      port: node.port,
      timeout: this.timeout
    };

    switch (node.type) {
      case 'ss':
        return this.createShadowsocksConfig(node, baseConfig);
      case 'ssr':
        return this.createShadowsocksRConfig(node, baseConfig);
      case 'vmess':
        return this.createVmessConfig(node, baseConfig);
      case 'trojan':
        return this.createTrojanConfig(node, baseConfig);
      case 'http':
      case 'https':
        return this.createHttpConfig(node, baseConfig);
      case 'socks5':
        return this.createSocks5Config(node, baseConfig);
      default:
        logger.warn(`不支持的代理类型: ${node.type} - ${node.name}`);
        return null;
    }
  }

  /**
   * 创建Shadowsocks代理配置
   */
  createShadowsocksConfig(node, baseConfig) {
    return {
      ...baseConfig,
      type: 'ss',
      password: node.password,
      method: node.cipher || node.method,
      auth: node.username && node.password ? {
        username: node.username,
        password: node.password
      } : null
    };
  }

  /**
   * 创建ShadowsocksR代理配置
   */
  createShadowsocksRConfig(node, baseConfig) {
    return {
      ...baseConfig,
      type: 'ssr',
      password: node.password,
      method: node.cipher || node.method,
      protocol: node.protocol,
      obfs: node.obfs,
      auth: node.username && node.password ? {
        username: node.username,
        password: node.password
      } : null
    };
  }

  /**
   * 创建Vmess代理配置
   */
  createVmessConfig(node, baseConfig) {
    return {
      ...baseConfig,
      type: 'vmess',
      uuid: node.uuid,
      alterId: node.alterId,
      network: node.network,
      tls: node.tls,
      sni: node.sni,
      wsPath: node.wsPath,
      wsHeaders: node.wsHeaders ? JSON.parse(node.wsHeaders) : {},
      auth: node.username && node.password ? {
        username: node.username,
        password: node.password
      } : null
    };
  }

  /**
   * 创建Trojan代理配置
   */
  createTrojanConfig(node, baseConfig) {
    return {
      ...baseConfig,
      type: 'trojan',
      password: node.password,
      tls: node.tls,
      sni: node.sni,
      auth: node.username && node.password ? {
        username: node.username,
        password: node.password
      } : null
    };
  }

  /**
   * 创建HTTP代理配置
   */
  createHttpConfig(node, baseConfig) {
    const config = {
      ...baseConfig,
      type: 'http'
    };

    if (node.username && node.password) {
      config.auth = {
        username: node.username,
        password: node.password
      };
    }

    if (node.tls) {
      config.https = true;
      config.sni = node.sni;
    }

    return config;
  }

  /**
   * 创建SOCKS5代理配置
   */
  createSocks5Config(node, baseConfig) {
    const config = {
      ...baseConfig,
      type: 'socks5'
    };

    if (node.username && node.password) {
      config.auth = {
        username: node.username,
        password: node.password
      };
    }

    return config;
  }

  /**
   * 测试基本连通性
   */
  async testBasicConnectivity(node, proxyConfig) {
    const startTime = Date.now();
    
    // 如果是直连测试
    if (node.type === 'direct') {
      return this.testDirectConnectivity();
    }
    
    // 对于高级代理类型，我们仍然尝试通过本地代理测试
    // 如果本地代理不可用，会在makeRequest中失败，这是正常的
    
    // 尝试多个测试URL
    for (const url of this.testUrls) {
      try {
        logger.debug(`尝试连接: ${node.name} -> ${url}`);
        
        const response = await this.makeRequest(node, proxyConfig, {
          method: 'HEAD',
          url: url,
          timeout: this.timeout,
          maxRedirects: 3
        });

        const latency = Date.now() - startTime;
        
        logger.debug(`连接成功: ${node.name} -> ${url} (${latency}ms)`);
        
        return {
          success: true,
          latency: latency,
          url: url,
          ipAddress: this.extractIpAddress(response),
          location: this.extractLocation(response)
        };
      } catch (error) {
        logger.debug(`连接失败: ${node.name} -> ${url} - ${error.message}`);
        continue;
      }
    }

    return {
      success: false,
      latency: null,
      url: null,
      ipAddress: null,
      location: null
    };
  }



  /**
   * 测试直连连通性
   */
  async testDirectConnectivity() {
    const startTime = Date.now();
    
    for (const url of this.testUrls) {
      try {
        logger.debug(`尝试直连: ${url}`);
        
        const response = await axios.get(url, {
          timeout: this.timeout,
          headers: {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
          }
        });

        const latency = Date.now() - startTime;
        
        logger.debug(`直连成功: ${url} (${latency}ms)`);
        
        return {
          success: true,
          latency: latency,
          url: url,
          ipAddress: this.extractIpAddress(response),
          location: this.extractLocation(response)
        };
      } catch (error) {
        logger.debug(`直连失败: ${url} - ${error.message}`);
        continue;
      }
    }

    return {
      success: false,
      latency: null,
      url: null,
      ipAddress: null,
      location: null
    };
  }

  /**
   * 发送HTTP请求
   */
  async makeRequest(node, proxyConfig, requestConfig) {
    const agent = this.createProxyAgent(node, proxyConfig);
    
    if (!agent) {
      throw new Error(`无法创建代理Agent: ${proxyConfig.type}`);
    }
    
    logger.debug(`使用代理: ${node.name} - ${proxyConfig.type}://${proxyConfig.host}:${proxyConfig.port}`);
    
    const config = {
      ...requestConfig,
      httpsAgent: agent,
      httpAgent: agent,
      headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
        ...requestConfig.headers
      }
    };

    return axios(config);
  }

  /**
   * 创建代理Agent
   */
  createProxyAgent(node, proxyConfig) {
    try {
      logger.debug(`创建代理Agent: ${node.name} - ${proxyConfig.type}`);
      
      switch (proxyConfig.type) {
        case 'http':
        case 'https':
          // HTTP/HTTPS代理
          let httpProxyUrl = `${proxyConfig.type}://${proxyConfig.host}:${proxyConfig.port}`;
          
          // 如果有认证信息，添加到URL中
          if (proxyConfig.auth) {
            const { username, password } = proxyConfig.auth;
            httpProxyUrl = `${proxyConfig.type}://${username}:${password}@${proxyConfig.host}:${proxyConfig.port}`;
          }
          
          const httpAgent = new HttpsProxyAgent(httpProxyUrl);
          logger.debug(`HTTP代理创建成功: ${node.name} - ${httpProxyUrl}`);
          return httpAgent;
          
        case 'socks5':
          // SOCKS5代理
          let socksProxyUrl = `socks5://${proxyConfig.host}:${proxyConfig.port}`;
          
          // 如果有认证信息，添加到URL中
          if (proxyConfig.auth) {
            const { username, password } = proxyConfig.auth;
            socksProxyUrl = `socks5://${username}:${password}@${proxyConfig.host}:${proxyConfig.port}`;
          }
          
          const socksAgent = new SocksProxyAgent(socksProxyUrl);
          logger.debug(`SOCKS5代理创建成功: ${node.name} - ${socksProxyUrl}`);
          return socksAgent;
          
        case 'ss':
        case 'ssr':
        case 'vmess':
        case 'trojan':
          // 对于这些高级代理类型，我们需要通过本地Clash代理来测试
          // 因为Node.js没有直接的vmess/ss客户端库
          logger.info(`通过本地Clash代理测试: ${proxyConfig.type} - ${node.name}`);
          
          // 使用本地Clash混合端口
          const localProxyUrl = 'http://127.0.0.1:7890';
          const localAgent = new HttpsProxyAgent(localProxyUrl);
          logger.debug(`使用本地Clash代理: ${node.name} - ${localProxyUrl}`);
          return localAgent;
          
        default:
          logger.warn(`不支持的代理类型: ${proxyConfig.type} - ${node.name}`);
          return null;
      }
      
    } catch (error) {
      logger.error(`创建代理Agent失败: ${node.name}`, { error: error.message, type: proxyConfig.type });
      return null;
    }
  }

  /**
   * 提取IP地址
   */
  extractIpAddress(response) {
    // 从响应头中提取IP地址
    return response.headers['x-forwarded-for'] || 
           response.headers['x-real-ip'] || 
           response.headers['cf-connecting-ip'] ||
           'unknown';
  }

  /**
   * 提取位置信息
   */
  extractLocation(response) {
    // 从响应头中提取位置信息
    if (response.headers['cf-ray']) {
      return 'Cloudflare';
    }
    if (response.headers['cf-ipcountry']) {
      return response.headers['cf-ipcountry'];
    }
    return 'unknown';
  }

  /**
   * 保存测试结果
   */
  async saveTestResult(testResult) {
    try {
      await TestResult.create(testResult);
    } catch (error) {
      logger.error(`保存测试结果失败: ${error.message}`);
    }
  }

  /**
   * 批量测试节点
   */
  async testNodes(nodes) {
    logger.info(`开始批量测试 ${nodes.length} 个节点`);
    
    const results = [];
    const concurrency = parseInt(process.env.CONCURRENCY) || 5;
    
    // 分批处理，控制并发数
    for (let i = 0; i < nodes.length; i += concurrency) {
      const batch = nodes.slice(i, i + concurrency);
      const batchPromises = batch.map(node => this.testNode(node));
      
      const batchResults = await Promise.allSettled(batchPromises);
      
      batchResults.forEach((result, index) => {
        if (result.status === 'fulfilled') {
          results.push(result.value);
        } else {
          logger.error(`节点测试失败: ${batch[index].name} - ${result.reason}`);
        }
      });
      
      // 批次间延迟，避免过于频繁的请求
      if (i + concurrency < nodes.length) {
        await new Promise(resolve => setTimeout(resolve, 1000));
      }
    }
    
    const successCount = results.filter(r => r.isSuccess).length;
    logger.info(`批量测试完成: ${successCount}/${nodes.length} 个节点连通`);
    
    return results;
  }

  /**
   * 数组分块
   */
  chunkArray(array, size) {
    const chunks = [];
    for (let i = 0; i < array.length; i += size) {
      chunks.push(array.slice(i, i + size));
    }
    return chunks;
  }
}

module.exports = SpeedTester;