// Cloudflare Worker 代码 - 简书 RSS 生成器
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
  const url = new URL(request.url)
  const path = url.pathname
  
  // 设置 CORS 头
  const headers = {
    'Access-Control-Allow-Origin': '*',
    'Access-Control-Allow-Methods': 'GET, HEAD, POST, OPTIONS',
    'Access-Control-Allow-Headers': 'Content-Type',
    'Content-Type': 'application/xml; charset=utf-8'
  }

  // 处理简书用户文章 RSS
  if (path.startsWith('/jianshu/user/')) {
    const userId = path.split('/').pop()
    return await generateJianshuRSS(userId, headers)
  }
  
  // 首页提示
  return new Response(`
    
🎉 RSSHub Cloudflare Worker 运行中！
    
使用方式：/jianshu/user/作者ID
    
示例：https://你的域名/jianshu/user/e5093f04e510
  `, { headers: { 'Content-Type': 'text/html' } })
}

async function generateJianshuRSS(userId, headers) {
  try {
    // 获取用户文章列表
    const apiUrl = `https://www.jianshu.com/users/${userId}/timeline`
    
    const response = await fetch(apiUrl, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
        'Accept': 'application/json'
      }
    })
    
    if (!response.ok) {
      throw new Error('Failed to fetch user data')
    }
    
    const html = await response.text()
    
    // 解析文章数据（从 HTML 中提取）
    const articles = parseArticles(html, userId)
    
    if (articles.length === 0) {
      throw new Error('No articles found')
    }
    
    // 生成 RSS XML
    const rssXml = generateRSS(articles, userId)
    
    return new Response(rssXml, { headers })
    
  } catch (error) {
    return new Response(`${error.message}`, { 
      status: 500,
      headers 
    })
  }
}

function parseArticles(html, userId) {
  const articles = []
  
  // 使用正则提取文章信息
  const titleRegex = /([^<]+)<\/a>/g
  const timeRegex = //g
  
  let match
  const titles = []
  const times = []
  
  while ((match = titleRegex.exec(html)) !== null) {
    titles.push({
      id: match[1],
      title: match[2].trim()
    })
  }
  
  while ((match = timeRegex.exec(html)) !== null) {
    times.push(match[1])
  }
  
  // 合并数据（取前10篇）
  for (let i = 0; i < Math.min(titles.length, times.length, 10); i++) {
    articles.push({
      title: titles[i].title,
      link: `https://www.jianshu.com/p/${titles[i].id}`,
      pubDate: new Date(times[i]).toUTCString(),
      guid: titles[i].id
    })
  }
  
  return articles
}

function generateRSS(articles, userId) {
  const now = new Date().toUTCString()
  
  let items = articles.map(article => `
    
      
      ${article.link}
      ${article.guid}
      ${article.pubDate}
      
    
  `).join('')
  
  return `

  
    
    https://www.jianshu.com/u/${userId}
    简书用户文章 RSS 订阅
    ${now}
    zh-CN
    ${items}
  
`
}