/**
 * 搜索请求日志中间件
 * @description 记录所有搜索相关的请求和响应
 */

const { FormLog } = require('../models');

/**
 * 搜索请求日志中间件
 * @param {Object} req - 请求对象
 * @param {Object} res - 响应对象
 * @param {Function} next - 下一个中间件
 */
const searchLogger = async (req, res, next) => {
  const startTime = Date.now();
  const requestId = Math.random().toString(36).substr(2, 9);
  
  // 为请求添加唯一ID
  req.searchRequestId = requestId;
  
  console.log(`🌐 [搜索中间件] 请求开始:`, {
    requestId: requestId,
    method: req.method,
    url: req.originalUrl,
    query: req.query,
    body: req.body,
    headers: {
      'user-agent': req.get('User-Agent'),
      'content-type': req.get('Content-Type'),
      'accept': req.get('Accept'),
      'referer': req.get('Referer')
    },
    ip: req.ip || req.connection.remoteAddress,
    timestamp: new Date().toISOString()
  });
  
  // 记录请求日志到数据库
  try {
    await FormLog.create({
      action: 'search_request',
      module: 'farm_search',
      userId: req.user ? req.user.id : null,
      formData: JSON.stringify({
        requestId: requestId,
        method: req.method,
        url: req.originalUrl,
        query: req.query,
        body: req.body,
        userAgent: req.get('User-Agent'),
        clientIP: req.ip || req.connection.remoteAddress,
        timestamp: new Date().toISOString()
      }),
      oldValues: null,
      newValues: JSON.stringify(req.query),
      success: true,
      errorMessage: null
    });
  } catch (logError) {
    console.error('❌ [搜索中间件] 记录请求日志失败:', logError);
  }
  
  // 监听响应
  const originalSend = res.send;
  res.send = function(data) {
    const endTime = Date.now();
    const responseTime = endTime - startTime;
    
    console.log(`📤 [搜索中间件] 响应完成:`, {
      requestId: requestId,
      statusCode: res.statusCode,
      responseTime: responseTime + 'ms',
      dataSize: data ? data.length : 0,
      timestamp: new Date().toISOString()
    });
    
    // 记录响应日志到数据库
    try {
      let responseData;
      try {
        responseData = JSON.parse(data);
      } catch (e) {
        responseData = { raw: data };
      }
      
      FormLog.create({
        action: 'search_response',
        module: 'farm_search',
        userId: req.user ? req.user.id : null,
        formData: JSON.stringify({
          requestId: requestId,
          statusCode: res.statusCode,
          responseTime: responseTime,
          dataSize: data ? data.length : 0,
          success: res.statusCode < 400,
          timestamp: new Date().toISOString()
        }),
        oldValues: null,
        newValues: JSON.stringify(responseData),
        success: res.statusCode < 400,
        errorMessage: res.statusCode >= 400 ? `HTTP ${res.statusCode}` : null
      });
    } catch (logError) {
      console.error('❌ [搜索中间件] 记录响应日志失败:', logError);
    }
    
    // 调用原始send方法
    originalSend.call(this, data);
  };
  
  next();
};

module.exports = searchLogger;