/**
 * 数据迁移脚本：将旧字段迁移到新的 genStage 字段
 * Run: npx ts-node prisma/migrate-genstage.ts
 */

import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

async function migrate() {
  console.log('开始数据迁移...');

  // ========== Book 迁移 ==========
  console.log('\n迁移 Book 表...');

  const books = await prisma.book.findMany();
  let updatedBookCount = 0;

  for (const book of books) {
    let newGenStage: string;

    switch (book.status) {
      case 'draft':
        newGenStage = 'draft';
        break;
      case 'planning':
        newGenStage = 'outline_completed';
        break;
      case 'generating':
        // 需要检查子章节的实际状态
        newGenStage = await inferBookGenStageFromChapters(book.id);
        break;
      case 'completed':
        newGenStage = await inferBookGenStageFromChapters(book.id);
        break;
      case 'failed':
      case 'interrupted':
        newGenStage = 'failed';
        break;
      default:
        newGenStage = 'draft';
    }

    await prisma.book.update({
      where: { id: book.id },
      data: {
        genStage: newGenStage,
        failedStage: newGenStage === 'failed' ? book.status : undefined,
      },
    });
    updatedBookCount++;
    console.log(`  Book ${book.id}: ${book.status} → ${newGenStage}`);
  }

  console.log(`Book 迁移完成: ${updatedBookCount} 条`);

  // ========== BookChapter 迁移 ==========
  console.log('\n迁移 BookChapter 表...');

  const chapters = await prisma.bookChapter.findMany();
  let updatedChapterCount = 0;

  for (const chapter of chapters) {
    let newGenStage: string;

    if (chapter.videoStatus === 'completed') {
      newGenStage = 'video_completed';
    } else if (chapter.videoStatus === 'generating') {
      newGenStage = 'video_generating';
    } else if (chapter.audioStatus === 'completed') {
      newGenStage = 'audio_completed';
    } else if (chapter.audioStatus === 'generating') {
      newGenStage = 'audio_generating';
    } else if (chapter.contentStatus === 'completed') {
      newGenStage = 'content_completed';
    } else if (chapter.contentStatus === 'generating') {
      newGenStage = 'content_generating';
    } else if (chapter.status === 'completed') {
      // 旧数据只有 status
      newGenStage = 'content_completed';
    } else if (chapter.status === 'failed' || chapter.contentStatus === 'failed' || chapter.audioStatus === 'failed' || chapter.videoStatus === 'failed') {
      newGenStage = 'failed';
    } else {
      newGenStage = 'idle';
    }

    await prisma.bookChapter.update({
      where: { id: chapter.id },
      data: { genStage: newGenStage },
    });
    updatedChapterCount++;
    console.log(`  Chapter ${chapter.id}: status=${chapter.status}, content=${chapter.contentStatus}, audio=${chapter.audioStatus}, video=${chapter.videoStatus} → ${newGenStage}`);
  }

  console.log(`BookChapter 迁移完成: ${updatedChapterCount} 条`);

  console.log('\n✅ 数据迁移完成!');
}

/**
 * 根据子章节状态推断 Book 的 genStage
 */
async function inferBookGenStageFromChapters(bookId: number): Promise<string> {
  const chapters = await prisma.bookChapter.findMany({
    where: { bookId, level: { gte: 1 }, parentId: 0 },
  });

  if (chapters.length === 0) return 'draft';

  // 检查是否有任意章节已达到 video_completed
  const hasVideoCompleted = chapters.some(c => c.genStage === 'video_completed' || c.videoStatus === 'completed');
  if (hasVideoCompleted) return 'video_completed';

  // 检查是否有章节已达到 audio_completed
  const hasAudioCompleted = chapters.some(c => c.genStage === 'audio_completed' || c.audioStatus === 'completed');
  if (hasAudioCompleted) return 'audio_completed';

  // 检查是否有章节已达到 content_completed
  const hasContentCompleted = chapters.some(c => c.genStage === 'content_completed' || c.contentStatus === 'completed');
  if (hasContentCompleted) return 'content_generating'; // 部分完成，仍在生成中

  return 'content_generating';
}

migrate()
  .catch(console.error)
  .finally(() => prisma.$disconnect());