/**
 * 内容上传 API
 * 供科室/Skill 直接上传单篇文章到书籍内容，写入 chapters 表
 * 字段：标题、定价、内容、格式、插入内容中的图片（URL 列表）
 */

import { NextRequest, NextResponse } from 'next/server'
import { query } from '@/lib/db'

function slug(id: string): string {
  return id.replace(/\s+/g, '-').replace(/[^\w\u4e00-\u9fa5-]/g, '').slice(0, 30) || 'section'
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const {
      title,
      price = 1,
      content = '',
      format = 'markdown',
      images = [],
      partId = 'part-1',
      partTitle = '真实的人',
      chapterId = 'chapter-1',
      chapterTitle = '未分类',
      isFree = false,
      sectionId
    } = body

    if (!title || typeof title !== 'string') {
      return NextResponse.json(
        { success: false, error: '标题 title 不能为空' },
        { status: 400 }
      )
    }

    // 若内容中含占位符 {{image_0}} {{image_1}}，用 images 数组替换
    let finalContent = typeof content === 'string' ? content : ''
    if (Array.isArray(images) && images.length > 0) {
      images.forEach((url: string, i: number) => {
        finalContent = finalContent.replace(
          new RegExp(`\\{\\{image_${i}\\}\\}`, 'g'),
          url.startsWith('http') ? `![图${i + 1}](${url})` : url
        )
      })
    }
    // 未替换的占位符去掉
    finalContent = finalContent.replace(/\{\{image_\d+\}\}/g, '')

    const wordCount = (finalContent || '').length
    const id = sectionId || `upload.${slug(title)}.${Date.now()}`

    await query(
      `INSERT INTO chapters (id, part_id, part_title, chapter_id, chapter_title, section_title, content, word_count, is_free, price, sort_order, status)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 9999, 'published')
       ON DUPLICATE KEY UPDATE
         section_title = VALUES(section_title),
         content = VALUES(content),
         word_count = VALUES(word_count),
         is_free = VALUES(is_free),
         price = VALUES(price),
         updated_at = CURRENT_TIMESTAMP`,
      [
        id,
        partId,
        partTitle,
        chapterId,
        chapterTitle,
        title,
        finalContent,
        wordCount,
        !!isFree,
        Number(price) || 1
      ]
    )

    return NextResponse.json({
      success: true,
      id,
      message: '内容已上传并写入 chapters 表',
      title,
      price: Number(price) || 1,
      isFree: !!isFree,
      wordCount
    })
  } catch (error) {
    console.error('[Content Upload]', error)
    return NextResponse.json(
      {
        success: false,
        error: '上传失败: ' + (error as Error).message
      },
      { status: 500 }
    )
  }
}