import { NextRequest } from 'next/server';

const BACKEND_BASE = process.env.NEXT_PUBLIC_BACKEND_URL || 'http://127.0.0.1:8000/api';

export async function GET(
  req: NextRequest,
  context: { params: Promise<{ slug: string[] }> }
) {
  const url = new URL(req.url);
  const { slug } = await context.params;
  const path = slug.join('/');
  const target = `${BACKEND_BASE}/financials/${path}${url.search}`;
  const resp = await fetch(target, { headers: { 'Content-Type': 'application/json' } });
  // 透传后端响应（支持流式 body）
  const headers = new Headers();
  // 复制关键头，减少代理层缓冲
  const contentType = resp.headers.get('content-type') || 'application/json; charset=utf-8';
  headers.set('content-type', contentType);
  const cacheControl = resp.headers.get('cache-control');
  if (cacheControl) headers.set('cache-control', cacheControl);
  const xAccelBuffering = resp.headers.get('x-accel-buffering');
  if (xAccelBuffering) headers.set('x-accel-buffering', xAccelBuffering);
  return new Response(resp.body, { status: resp.status, headers });
}