import { and, eq } from 'drizzle-orm'
import { z } from 'zod'

/** 切换章节的当前版本 */
export default defineEventHandler(async (event) => {
  const chapter = getChapter(param(event))
  const { versionId } = await readJson(event, z.object({ versionId: z.string() }))
  const v = useDb().select().from(tables.chapterVersions)
    .where(and(eq(tables.chapterVersions.id, versionId), eq(tables.chapterVersions.chapterId, chapter.id))).get()
  if (!v) throw createError({ statusCode: 404, message: '版本不存在' })
  if (v.status === 'writing') throw createError({ statusCode: 400, message: '该版本仍在写作中' })
  useDb().update(tables.chapters).set({
    activeVersionId: v.id,
    // 切换版本后需要重新确认，以便重新生成摘要
    status: chapter.status === 'approved' ? 'written' : chapter.status === 'writing' ? chapter.status : 'written'
  }).where(eq(tables.chapters.id, chapter.id)).run()
  emitProject(chapter.projectId, { type: 'chapter', chapterId: chapter.id })
  return { ok: true }
})