// app/api/admin/content/route.ts
// 内容模块管理API

import { NextRequest, NextResponse } from 'next/server'
import fs from 'fs'
import path from 'path'
import matter from 'gray-matter'

const BOOK_DIR = path.join(process.cwd(), 'book')

// GET: 获取所有章节列表
export async function GET(req: NextRequest) {
  try {
    const chapters = getAllChapters()
    
    return NextResponse.json({
      success: true,
      chapters,
      total: chapters.length
    })
  } catch (error) {
    return NextResponse.json(
      { error: '获取章节列表失败' },
      { status: 500 }
    )
  }
}

// POST: 创建新章节
export async function POST(req: NextRequest) {
  try {
    const body = await req.json()
    const { title, content, category, tags } = body

    if (!title || !content) {
      return NextResponse.json(
        { error: '标题和内容不能为空' },
        { status: 400 }
      )
    }

    // 生成文件名
    const fileName = `${title}.md`
    const filePath = path.join(BOOK_DIR, category || '第一篇｜真实的人', fileName)

    // 创建Markdown内容
    const markdownContent = matter.stringify(content, {
      title,
      date: new Date().toISOString(),
      tags: tags || [],
      draft: false
    })

    // 写入文件
    fs.writeFileSync(filePath, markdownContent, 'utf-8')

    return NextResponse.json({
      success: true,
      message: '章节创建成功',
      filePath
    })
  } catch (error) {
    console.error('创建章节失败:', error)
    return NextResponse.json(
      { error: '创建章节失败' },
      { status: 500 }
    )
  }
}

// PUT: 更新章节
export async function PUT(req: NextRequest) {
  try {
    const body = await req.json()
    const { id, title, content, category, tags } = body

    if (!id) {
      return NextResponse.json(
        { error: '章节ID不能为空' },
        { status: 400 }
      )
    }

    // TODO: 根据ID找到文件并更新
    
    return NextResponse.json({
      success: true,
      message: '章节更新成功'
    })
  } catch (error) {
    return NextResponse.json(
      { error: '更新章节失败' },
      { status: 500 }
    )
  }
}

// DELETE: 删除章节
export async function DELETE(req: NextRequest) {
  try {
    const { searchParams } = new URL(req.url)
    const id = searchParams.get('id')

    if (!id) {
      return NextResponse.json(
        { error: '章节ID不能为空' },
        { status: 400 }
      )
    }

    // TODO: 根据ID删除文件
    
    return NextResponse.json({
      success: true,
      message: '章节删除成功'
    })
  } catch (error) {
    return NextResponse.json(
      { error: '删除章节失败' },
      { status: 500 }
    )
  }
}

// 辅助函数：获取所有章节
function getAllChapters() {
  const chapters: any[] = []
  
  // 遍历book目录下的所有子目录
  const categories = fs.readdirSync(BOOK_DIR).filter(item => {
    const itemPath = path.join(BOOK_DIR, item)
    return fs.statSync(itemPath).isDirectory()
  })

  categories.forEach(category => {
    const categoryPath = path.join(BOOK_DIR, category)
    const files = fs.readdirSync(categoryPath).filter(file => file.endsWith('.md'))

    files.forEach(file => {
      const filePath = path.join(categoryPath, file)
      const fileContent = fs.readFileSync(filePath, 'utf-8')
      const { data, content } = matter(fileContent)

      chapters.push({
        id: `${category}/${file.replace('.md', '')}`,
        title: data.title || file.replace('.md', ''),
        category,
        words: content.length,
        date: data.date || fs.statSync(filePath).mtime.toISOString(),
        tags: data.tags || [],
        draft: data.draft || false,
        filePath
      })
    })
  })

  return chapters.sort((a, b) => new Date(b.date).getTime() - new Date(a.date).getTime())
}