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 { buildJkkp8Rows, jkkp8Csv, type Jkkp8Incident } from '@/lib/reports/jkkp8'

export async function GET(request: NextRequest) {
  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 yearParam = request.nextUrl.searchParams.get('year')
  const year = Number.parseInt(yearParam ?? '', 10) || new Date().getFullYear()

  const { data: incidents, error } = await supabase
    .from('incidents')
    .select(`
      reference_no, incident_type, description, reported_at,
      medical_status, lost_days,
      is_fatality, is_serious_bodily_injury, is_dangerous_occurrence, is_occupational_disease,
      sites (name),
      zones (name),
      reporter:users!reported_by (name),
      dosh_reports (form_type, status, submitted_at)
    `)
    .gte('reported_at', `${year}-01-01T00:00:00Z`)
    .lt('reported_at', `${year + 1}-01-01T00:00:00Z`)
    .order('reported_at', { ascending: true })

  if (error) return NextResponse.json({ error: 'Fetch failed' }, { status: 500 })

  const rows = buildJkkp8Rows((incidents ?? []) as unknown as Jkkp8Incident[])
  const csv = jkkp8Csv(rows)

  await supabase.rpc('write_audit_log', {
    p_table_name: 'incidents',
    p_record_id: session.sub,
    p_action: 'jkkp8_register_export',
    p_new_value: { year, row_count: rows.length },
  })

  return new NextResponse(csv, {
    status: 200,
    headers: {
      'Content-Type': 'text/csv; charset=utf-8',
      'Content-Disposition': `attachment; filename="jkkp8-register-${year}.csv"`,
    },
  })
}