import { NextResponse } from 'next/server';

const API_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:4000/api';

export async function GET() {
  let upstream: Response;
  try {
    upstream = await fetch(`${API_URL}/calendar/ics`, {
      headers: { Accept: 'text/calendar' },
      cache: 'no-store',
    });
  } catch {
    return new NextResponse('Calendar service unavailable', { status: 502 });
  }

  if (!upstream.ok) {
    return new NextResponse('Failed to fetch calendar', { status: upstream.status });
  }

  const body = await upstream.text();

  return new NextResponse(body, {
    status: 200,
    headers: {
      'Content-Type': 'text/calendar; charset=utf-8',
      'Cache-Control': 'public, max-age=300',
      'Content-Disposition': 'inline; filename="bbe-events.ics"',
    },
  });
}