import type { NextApiRequest, NextApiResponse } from 'next'
import { prisma } from '@/lib/prisma'
import { requireAuth, logAction } from '@/lib/auth'
import { notifySolutionConfirmed } from '@/lib/email'
import { NCRSeverity, NCRStatus } from '@/types'

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
  const user = await requireAuth(req, res, ['ADMIN', 'QC'])
  if (!user) return

  const { id } = req.query as { id: string }

  const ncr = await prisma.nCR.findUnique({
    where: { id },
    include: { raisedBy: { select: { id: true, name: true, email: true } }, capa: { select: { ref: true } } },
  })
  if (!ncr) return res.status(404).json({ error: 'NCR not found' })

  if (req.method === 'GET') {
    return res.json({ data: ncr })
  }

  if (req.method === 'PATCH') {
    const before = { ...ncr }
    const { severity, status, resolution, category, confirmNotify } = req.body as {
      severity?: NCRSeverity
      status?: NCRStatus
      resolution?: string
      category?: string
      confirmNotify?: boolean
    }

    const updateData: any = {}

    if (severity !== undefined) updateData.severity = severity

    if (status !== undefined) updateData.status = status

    if (resolution !== undefined && category !== undefined) {
      // Resolving — requires both resolution notes and a category, files to library
      updateData.resolution = resolution
      updateData.category = category
      updateData.status = 'RESOLVED'
      updateData.resolvedAt = new Date()
    }

    if (confirmNotify) {
      updateData.notified = true
      updateData.notifiedAt = new Date()
    }

    const updated = await prisma.nCR.update({
      where: { id },
      data: updateData,
      include: { raisedBy: { select: { id: true, name: true, email: true } }, capa: { select: { ref: true } } },
    })

    // File to resolutions library
    if (resolution !== undefined && category !== undefined) {
      await prisma.resolution.create({
        data: {
          title: ncr.description.length > 80 ? ncr.description.slice(0, 80) + '…' : ncr.description,
          category, resolution, linkedRef: ncr.ref,
        }
      })
    }

    // Confirm-and-notify: emails/notifies whoever raised the NCR
    if (confirmNotify && ncr.raisedBy) {
      await notifySolutionConfirmed(ncr.ref, ncr.description, ncr.raisedBy.email, ncr.raisedBy.id)
    }

    await logAction(user.id, 'UPDATE', 'NCR', id, before, updated)
    return res.json({ data: updated })
  }

  res.status(405).end()
}