import { NextResponse, type NextRequest } from 'next/server';
import { getSupabaseAdmin } from '@/lib/supabase/admin';
import { validateSubdomain } from '@/lib/validation';

export const runtime = 'nodejs';
export const dynamic = 'force-dynamic';

export async function GET(req: NextRequest) {
  const sub = req.nextUrl.searchParams.get('subdomain');
  const v = validateSubdomain(sub);
  if (!v.ok) {
    return NextResponse.json(
      { available: false, error: v.error },
      { status: 200 },
    );
  }
  const admin = getSupabaseAdmin();
  const { data, error } = await admin
    .from('tunnels')
    .select('user_id')
    .eq('subdomain', v.value)
    .maybeSingle<{ user_id: string }>();
  if (error) {
    return NextResponse.json({ available: false }, { status: 500 });
  }
  return NextResponse.json({ available: !data });
}