import { NextRequest, NextResponse } from 'next/server';

const API_BASE = process.env.API_URL || 'https://ai.aaronnelson.studio';

async function handler(
  request: NextRequest,
  { params }: { params: Promise<{ slug: string[] }> }
) {
  const { slug } = await params;
  const path = '/api/' + slug.join('/');
  const url = `${API_BASE}${path}${request.nextUrl.search}`;

  const headers = new Headers();

  // Forward content-type exactly (includes multipart boundary)
  const contentType = request.headers.get('content-type');
  if (contentType) headers.set('content-type', contentType);

  // Forward session cookie
  const cookie = request.headers.get('cookie');
  if (cookie) headers.set('cookie', cookie);

  // Forward body
  let body: BodyInit | undefined;
  if (request.method !== 'GET' && request.method !== 'HEAD') {
    body = await request.arrayBuffer();
  }

  const response = await fetch(url, {
    method: request.method,
    headers,
    body,
  });

  const responseHeaders = new Headers();
  const setCookie = response.headers.get('set-cookie');
  if (setCookie) responseHeaders.set('set-cookie', setCookie);
  const respContentType = response.headers.get('content-type');
  if (respContentType) responseHeaders.set('content-type', respContentType);

  return new NextResponse(response.body, {
    status: response.status,
    headers: responseHeaders,
  });
}

export const GET = handler;
export const POST = handler;
export const PUT = handler;
export const PATCH = handler;
export const DELETE = handler;
export const OPTIONS = handler;