const express = require('express')
const router = express.Router()
const { promisify } = require('util')
const { exec } = require('child_process')
const execAsync = promisify(exec)

// IP查询API
router.get('/ip/:ip?', async (req, res) => {
  try {
    const ip = req.params.ip || req.ip || req.connection.remoteAddress
    
    // 如果是IPv6的IPv4映射地址，提取IPv4部分
    const cleanIp = ip.replace(/^::ffff:/, '')
    
    // 使用免费的IP查询服务
    const fetch = require('node-fetch')
    const response = await fetch(`http://ip-api.com/json/${cleanIp}?lang=zh-CN`)
    const data = await response.json()
    
    if (data.status === 'success') {
      res.json({
        success: true,
        data: {
          ip: cleanIp,
          country: data.country,
          region: data.regionName,
          city: data.city,
          isp: data.isp,
          timezone: data.timezone,
          lat: data.lat,
          lon: data.lon
        }
      })
    } else {
      res.json({
        success: false,
        message: '无法查询该IP地址信息'
      })
    }
  } catch (error) {
    console.error('IP查询错误:', error)
    res.status(500).json({
      success: false,
      message: '服务器内部错误'
    })
  }
})

// 获取当前IP
router.get('/myip', (req, res) => {
  const ip = req.ip || req.connection.remoteAddress
  const cleanIp = ip.replace(/^::ffff:/, '')
  
  res.json({
    success: true,
    data: {
      ip: cleanIp
    }
  })
})

// 代理请求API（用于HTTP测试工具）
router.post('/proxy', async (req, res) => {
  try {
    const { url, method = 'GET', headers = {}, body } = req.body
    
    if (!url) {
      return res.status(400).json({
        success: false,
        message: 'URL参数不能为空'
      })
    }
    
    const fetch = require('node-fetch')
    
    const options = {
      method: method.toUpperCase(),
      headers: {
        'User-Agent': 'Vue-Tools-Kit/1.0.0',
        ...headers
      }
    }
    
    if (body && ['POST', 'PUT', 'PATCH'].includes(options.method)) {
      options.body = body
    }
    
    const startTime = Date.now()
    const response = await fetch(url, options)
    const endTime = Date.now()
    
    const responseHeaders = {}
    for (const [key, value] of response.headers.entries()) {
      responseHeaders[key] = value
    }
    
    const responseBody = await response.text()
    
    res.json({
      success: true,
      data: {
        status: response.status,
        statusText: response.statusText,
        headers: responseHeaders,
        body: responseBody,
        responseTime: endTime - startTime,
        url: response.url
      }
    })
    
  } catch (error) {
    console.error('代理请求错误:', error)
    res.status(500).json({
      success: false,
      message: error.message || '请求失败'
    })
  }
})

// Markdown转换API
router.post('/markdown/convert', (req, res) => {
  try {
    const { content, type } = req.body
    
    if (!content) {
      return res.status(400).json({
        success: false,
        message: '内容不能为空'
      })
    }
    
    if (type === 'html-to-md') {
      // HTML转Markdown
      const TurndownService = require('turndown')
      const turndownService = new TurndownService()
      const markdown = turndownService.turndown(content)
      
      res.json({
        success: true,
        data: { result: markdown }
      })
    } else if (type === 'md-to-html') {
      // Markdown转HTML
      const { marked } = require('marked')
      const html = marked(content)
      
      res.json({
        success: true,
        data: { result: html }
      })
    } else {
      res.status(400).json({
        success: false,
        message: '不支持的转换类型'
      })
    }
    
  } catch (error) {
    console.error('Markdown转换错误:', error)
    res.status(500).json({
      success: false,
      message: '转换失败: ' + error.message
    })
  }
})

// 文件格式化API
router.post('/format/code', (req, res) => {
  try {
    const { content, type } = req.body
    
    if (!content) {
      return res.status(400).json({
        success: false,
        message: '内容不能为空'
      })
    }
    
    let formatted = content
    
    switch (type) {
      case 'json':
        try {
          const parsed = JSON.parse(content)
          formatted = JSON.stringify(parsed, null, 2)
        } catch (e) {
          throw new Error('JSON格式错误')
        }
        break
        
      case 'xml':
        // 简单的XML格式化
        formatted = content
          .replace(/></g, '>\n<')
          .replace(/^\s*\n/gm, '')
        break
        
      default:
        throw new Error('不支持的格式化类型')
    }
    
    res.json({
      success: true,
      data: { result: formatted }
    })
    
  } catch (error) {
    console.error('代码格式化错误:', error)
    res.status(500).json({
      success: false,
      message: error.message || '格式化失败'
    })
  }
})

module.exports = router