import { db } from '~/drizzle/db'
import { semesters } from '~/drizzle/schema'
import { eq } from 'drizzle-orm'

export default defineEventHandler(async (event) => {
  // 检查用户认证和权限
  const user = event.context.user

  if (!user) {
    throw createError({
      statusCode: 401,
      message: '需要登录才能访问'
    })
  }

  if (!['ADMIN', 'SUPER_ADMIN', 'SONG_ADMIN'].includes(user.role)) {
    throw createError({
      statusCode: 403,
      message: '只有管理员才能管理学期'
    })
  }

  const body = await readBody(event)

  if (!body.semesterId) {
    throw createError({
      statusCode: 400,
      message: '学期ID不能为空'
    })
  }

  // 检查学期是否存在
  const semester = await db
    .select()
    .from(semesters)
    .where(eq(semesters.id, body.semesterId))
    .limit(1)

  if (semester.length === 0) {
    throw createError({
      statusCode: 404,
      message: '学期不存在'
    })
  }

  // 使用事务确保数据一致性
  await db.transaction(async (tx) => {
    // 先将所有学期设为非活跃
    await tx.update(semesters).set({ isActive: false }).where(eq(semesters.isActive, true))

    // 设置指定学期为活跃
    await tx.update(semesters).set({ isActive: true }).where(eq(semesters.id, body.semesterId))
  })

  return { message: '活跃学期设置成功' }
})