import { PrismaClient } from '@prisma/client';
import { logger } from '../src/utils/logger';

const prisma = new PrismaClient();

/**
 * 数据清洗脚本：为所有没有封面的笔记本自动补上相关课程的封面
 */
async function backfillNotebooksCover() {
  try {
    console.log('=== 开始清洗笔记本封面数据 ===\n');
    
    // 获取所有没有封面的笔记本
    const notebooks = await prisma.notebook.findMany({
      where: {
        OR: [
          { coverImage: null },
          { coverImage: '' },
        ],
      },
    });
    
    console.log(`找到 ${notebooks.length} 个需要补封面的笔记本\n`);
    
    let successCount = 0;
    let failCount = 0;
    
    for (const notebook of notebooks) {
      let coverImage: string | null = null;
      
      try {
        // 方法1：从关联笔记的课程中获取
        const firstNote = await prisma.note.findFirst({
          where: {
            notebookId: notebook.id,
            courseId: { not: null },
          },
          orderBy: { createdAt: 'asc' },
          include: {
            course: {
              select: {
                coverImage: true,
              },
            },
          },
        });
        
        if (firstNote?.course?.coverImage) {
          coverImage = firstNote.course.coverImage;
          console.log(`✅ [${notebook.id}] 从关联笔记的课程获取封面: ${coverImage}`);
        } else if (firstNote?.courseId) {
          // 备用方案：单独查询课程
          const course = await prisma.course.findUnique({
            where: { id: firstNote.courseId },
            select: { coverImage: true },
          });
          
          if (course?.coverImage) {
            coverImage = course.coverImage;
            console.log(`✅ [${notebook.id}] 从课程 ${firstNote.courseId} 获取封面（备用方案）: ${coverImage}`);
          }
        }
        
        // 方法2：如果方法1失败，通过课程名称匹配
        if (!coverImage) {
          const courseName = notebook.title
            .replace(/《/g, '')
            .replace(/》/g, '')
            .trim();
          
          if (courseName) {
            // 先尝试精确匹配
            let matchingCourse = await prisma.course.findFirst({
              where: { title: courseName },
              select: { id: true, title: true, coverImage: true },
            });
            
            // 如果精确匹配失败，尝试包含匹配
            if (!matchingCourse) {
              matchingCourse = await prisma.course.findFirst({
                where: {
                  title: {
                    contains: courseName,
                  },
                },
                select: { id: true, title: true, coverImage: true },
              });
            }
            
            if (matchingCourse?.coverImage) {
              coverImage = matchingCourse.coverImage;
              console.log(`✅ [${notebook.id}] 通过课程名称匹配获取封面: ${matchingCourse.title} -> ${coverImage}`);
            }
          }
        }
        
        // 更新笔记本封面
        if (coverImage) {
          await prisma.notebook.update({
            where: { id: notebook.id },
            data: { coverImage },
          });
          successCount++;
        } else {
          console.log(`⚠️  [${notebook.id}] "${notebook.title}" 无法找到匹配的课程封面`);
          failCount++;
        }
      } catch (error) {
        console.error(`❌ [${notebook.id}] 处理失败:`, error);
        failCount++;
      }
    }
    
    console.log(`\n=== 清洗完成 ===`);
    console.log(`成功: ${successCount} 个`);
    console.log(`失败: ${failCount} 个`);
  } catch (error) {
    console.error('脚本执行失败:', error);
  } finally {
    await prisma.$disconnect();
  }
}

backfillNotebooksCover();