import type { NextRequest } from 'next/server';
import { auth } from '@/app/api/auth';
import { getServerSideConfig } from '@/app/config/server';
import { ModelProvider, TENCENT_BASE_URL } from '@/app/constant';
import { prettyObject } from '@/app/utils/format';
import { getHeader } from '@/app/utils/tencent';
import { NextResponse } from 'next/server';

const serverConfig = getServerSideConfig();

async function handle(
  req: NextRequest,
  { params }: { params: { path: string[] } },
) {
  console.log('[Tencent Route] params ', params);

  if (req.method === 'OPTIONS') {
    return NextResponse.json({ body: 'OK' }, { status: 200 });
  }

  const authResult = auth(req, ModelProvider.Hunyuan);
  if (authResult.error) {
    return NextResponse.json(authResult, {
      status: 401,
    });
  }

  try {
    const response = await request(req);
    return response;
  } catch (e) {
    console.error('[Tencent] ', e);
    return NextResponse.json(prettyObject(e));
  }
}

export const GET = handle;
export const POST = handle;

export const runtime = 'edge';
export const preferredRegion = [
  'arn1',
  'bom1',
  'cdg1',
  'cle1',
  'cpt1',
  'dub1',
  'fra1',
  'gru1',
  'hnd1',
  'iad1',
  'icn1',
  'kix1',
  'lhr1',
  'pdx1',
  'sfo1',
  'sin1',
  'syd1',
];

async function request(req: NextRequest) {
  const controller = new AbortController();

  let baseUrl = serverConfig.tencentUrl || TENCENT_BASE_URL;

  if (!baseUrl.startsWith('http')) {
    baseUrl = `https://${baseUrl}`;
  }

  if (baseUrl.endsWith('/')) {
    baseUrl = baseUrl.slice(0, -1);
  }

  console.log('[Base Url]', baseUrl);

  const timeoutId = setTimeout(
    () => {
      controller.abort();
    },
    10 * 60 * 1000,
  );

  const fetchUrl = baseUrl;

  const body = await req.text();
  const headers = await getHeader(
    body,
    serverConfig.tencentSecretId as string,
    serverConfig.tencentSecretKey as string,
  );
  const fetchOptions: RequestInit = {
    headers,
    method: req.method,
    body,
    redirect: 'manual',
    // @ts-ignore
    duplex: 'half',
    signal: controller.signal,
  };

  try {
    const res = await fetch(fetchUrl, fetchOptions);

    // to prevent browser prompt for credentials
    const newHeaders = new Headers(res.headers);
    newHeaders.delete('www-authenticate');
    // to disable nginx buffering
    newHeaders.set('X-Accel-Buffering', 'no');

    return new Response(res.body, {
      status: res.status,
      statusText: res.statusText,
      headers: newHeaders,
    });
  } finally {
    clearTimeout(timeoutId);
  }
}