import { Router } from 'express'
import { prisma } from '../db.js'
import { authRequired } from '../middleware.js'

const router = Router()
router.use(authRequired)

// 报警列表: 按时间最新优先, cursor 分页 (cursor = id)
router.get('/alerts', async (req, res, next) => {
  try {
    const rawLimit = Number(req.query.limit)
    const limit = Number.isFinite(rawLimit) && rawLimit >= 1 ? Math.min(Math.floor(rawLimit), 50) : 10
    const rawCursor = Number(req.query.cursor)
    const cursor = Number.isInteger(rawCursor) && rawCursor > 0 ? rawCursor : null
    const where = cursor ? { id: { lt: cursor } } : {}
    const [items, total] = await Promise.all([
      prisma.alert.findMany({
        where,
        orderBy: { id: 'desc' },
        take: limit,
      }),
      prisma.alert.count(),
    ])
    const nextCursor = items.length === limit ? String(items[items.length - 1].id) : null
    res.json({ items, nextCursor, total })
  } catch (e) { next(e) }
})

export default router