export const dynamic = 'force-dynamic'

import { NextResponse } from 'next/server'
import { createClient } from '@/lib/supabase/server'

export async function GET() {
  const supabase = await createClient()
  const { data: { user } } = await supabase.auth.getUser()
  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })

  const { data: incidents, error } = await supabase
    .from('incidents')
    .select('id, status, incident_type, sites (name)')

  if (error) return NextResponse.json({ error: 'Failed to fetch stats' }, { status: 500 })

  const rows = incidents ?? []
  const total = rows.length
  const closed = rows.filter(r => r.status === 'closed').length
  const open = total - closed

  const by_type: Record<string, number> = {}
  for (const r of rows) {
    by_type[r.incident_type] = (by_type[r.incident_type] ?? 0) + 1
  }

  const siteMap: Record<string, number> = {}
  for (const r of rows) {
    const name = (r.sites as { name: string } | null)?.name ?? 'Unknown'
    siteMap[name] = (siteMap[name] ?? 0) + 1
  }
  const by_site = Object.entries(siteMap).map(([name, count]) => ({ name, count }))
    .sort((a, b) => b.count - a.count)

  return NextResponse.json({ total, open, closed, by_type, by_site })
}