import { NextRequest, NextResponse } from 'next/server'
import { z } from 'zod'

import { authenticateApiRequest } from '@/lib/api-auth'
import { prisma } from '@/lib/prisma'

interface RouteContext {
  params: Promise<{ id: string }>
}

const bodySchema = z.object({
  answer: z.string().min(1).max(8000),
})

export async function POST(request: NextRequest, ctx: RouteContext) {
  const auth = await authenticateApiRequest(request)
  if ('error' in auth) {
    return NextResponse.json({ error: auth.error }, { status: auth.status })
  }

  const { id } = await ctx.params

  let body: unknown
  try {
    body = await request.json()
  } catch {
    return NextResponse.json({ error: 'Malformed JSON' }, { status: 400 })
  }

  const parsed = bodySchema.safeParse(body)
  if (!parsed.success) {
    return NextResponse.json({ error: 'Ongeldige invoer', details: parsed.error.flatten() }, { status: 422 })
  }

  const uq = await prisma.userQuestion.findFirst({
    where: { id },
    select: { id: true, idea_id: true, status: true },
  })
  if (!uq) {
    return NextResponse.json({ error: 'UserQuestion niet gevonden' }, { status: 404 })
  }
  if (uq.status !== 'pending') {
    return NextResponse.json({ error: 'Vraag is al beantwoord' }, { status: 409 })
  }

  await prisma.userQuestion.update({
    where: { id },
    data: { answer: parsed.data.answer, status: 'answered' },
  })

  await prisma.$executeRaw`
    SELECT pg_notify('scrum4me_changes', ${JSON.stringify({
      op:       'U',
      entity:   'user_question',
      id,
      idea_id:  uq.idea_id,
      status:   'answered',
    })}::text)
  `

  return NextResponse.json({ ok: true })
}