import fs from 'fs'
import path from 'path'
import matter from 'gray-matter'

export function getArticles() {
  const articlesDirectory = path.join(process.cwd(), 'content', 'articles')
  const fileNames = fs.readdirSync(articlesDirectory)
  
  const articles = fileNames
    .filter(fileName => fileName.endsWith('.md'))
    .map(fileName => {
      const fullPath = path.join(articlesDirectory, fileName)
      const fileContents = fs.readFileSync(fullPath, 'utf8')
      const { data, content } = matter(fileContents)
      
      // 从文件名中提取日期（假设文件名格式为 YYYY-MM-DD-article-title.md）
      const dateMatch = fileName.match(/^(\d{4}-\d{2}-\d{2})-/)
      const date = dateMatch ? dateMatch[1] : ''
      
      // 提取简介（前150个字符）
      const excerpt = content.substring(0, 150) + '...'
      
      return {
        id: fileName.replace('.md', ''),
        date,
        title: data.title || fileName.replace(/\d{4}-\d{2}-\d{2}-/, '').replace('.md', ''),
        excerpt,
        content
      }
    })
  
  // 按日期排序，最近的优先
  return articles.sort((a, b) => {
    if (a.date && b.date) {
      return new Date(b.date) - new Date(a.date)
    }
    return 0
  })
}

export function getPagedArticles(page = 1, pageSize = 5) {
  const allArticles = getArticles()
  const startIndex = (page - 1) * pageSize
  const endIndex = startIndex + pageSize
  
  return {
    articles: allArticles.slice(startIndex, endIndex),
    total: allArticles.length,
    totalPages: Math.ceil(allArticles.length / pageSize),
    currentPage: page
  }
}