export const dynamic = 'force-dynamic'

import { NextRequest, NextResponse } from 'next/server'
import { createClient } from '@/lib/supabase/server'
import { getSession } from '@/lib/auth/get-session'
import { buildJkkp6Pdf, buildJkkp7Pdf, type JkkpIncident } from '@/lib/pdf/jkkp'
import { computeDoshObligation } from '@/lib/incidents/dosh'

export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  const { id } = await params
  const form = request.nextUrl.searchParams.get('form')
  if (form !== 'jkkp6' && form !== 'jkkp7')
    return NextResponse.json({ error: 'form must be jkkp6 or jkkp7' }, { status: 422 })

  const session = await getSession()
  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  if (!['hse', 'admin'].includes(session.role))
    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })

  const supabase = await createClient()

  const { data: incident } = await supabase
    .from('incidents')
    .select(`
      reference_no, incident_type, description, reported_at, severity, lost_days,
      is_fatality, is_serious_bodily_injury, is_dangerous_occurrence, is_occupational_disease,
      sites (name),
      reporter:users!reported_by (name)
    `)
    .eq('id', id)
    .single()

  if (!incident) return NextResponse.json({ error: 'Not found' }, { status: 404 })

  const dosh = computeDoshObligation({
    is_fatality: (incident as { is_fatality: boolean }).is_fatality,
    is_serious_bodily_injury: (incident as { is_serious_bodily_injury: boolean }).is_serious_bodily_injury,
    is_dangerous_occurrence: (incident as { is_dangerous_occurrence: boolean }).is_dangerous_occurrence,
    is_occupational_disease: (incident as { is_occupational_disease: boolean }).is_occupational_disease,
    lost_days: (incident as { lost_days: number | null }).lost_days,
  })

  const required = form === 'jkkp6' ? dosh.requires_jkkp6 : dosh.requires_jkkp7
  if (!required) return NextResponse.json({ error: 'This form is not required for this incident' }, { status: 400 })

  const jkkpIncident: JkkpIncident = {
    reference_no: (incident as { reference_no: string | null }).reference_no,
    incident_type: (incident as { incident_type: string }).incident_type,
    description: (incident as { description: string }).description,
    reported_at: (incident as { reported_at: string }).reported_at,
    severity: (incident as { severity: number | null }).severity,
    is_fatality: (incident as { is_fatality: boolean }).is_fatality,
    is_serious_bodily_injury: (incident as { is_serious_bodily_injury: boolean }).is_serious_bodily_injury,
    is_dangerous_occurrence: (incident as { is_dangerous_occurrence: boolean }).is_dangerous_occurrence,
    lost_days: (incident as { lost_days: number | null }).lost_days,
    site_name: (incident.sites as unknown as { name: string } | null)?.name ?? 'Unknown',
    reporter_name: (incident.reporter as unknown as { name: string } | null)?.name ?? 'Unknown',
  }

  const pdfBytes = form === 'jkkp6'
    ? await buildJkkp6Pdf(jkkpIncident)
    : await buildJkkp7Pdf(jkkpIncident)

  const ref = jkkpIncident.reference_no ?? id
  return new NextResponse(Buffer.from(pdfBytes), {
    headers: {
      'Content-Type': 'application/pdf',
      'Content-Disposition': `attachment; filename="${form}-${ref}.pdf"`,
    },
  })
}