import type { NextRequest } from 'next/server';
import { auth } from '@/app/api/auth';
import { getServerSideConfig } from '@/app/config/server';
import {
  ApiPath,
  ModelProvider,
  MOONSHOT_BASE_URL,
  ServiceProvider,
} from '@/app/constant';
import { prettyObject } from '@/app/utils/format';
import { isModelAvailableInServer } from '@/app/utils/model';
import { NextResponse } from 'next/server';

const serverConfig = getServerSideConfig();

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

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

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

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

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

  // alibaba use base url or just remove the path
  const path = `${req.nextUrl.pathname}`.replaceAll(ApiPath.Moonshot, '');

  let baseUrl = serverConfig.moonshotUrl || MOONSHOT_BASE_URL;

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

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

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

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

  const fetchUrl = `${baseUrl}${path}`;
  const fetchOptions: RequestInit = {
    headers: {
      'Content-Type': 'application/json',
      'Authorization': req.headers.get('Authorization') ?? '',
    },
    method: req.method,
    body: req.body,
    redirect: 'manual',
    // @ts-ignore
    duplex: 'half',
    signal: controller.signal,
  };

  // #1815 try to refuse some request to some models
  if (serverConfig.customModels && req.body) {
    try {
      const clonedBody = await req.text();
      fetchOptions.body = clonedBody;

      const jsonBody = JSON.parse(clonedBody) as { model?: string };

      // not undefined and is false
      if (
        isModelAvailableInServer(
          serverConfig.customModels,
          jsonBody?.model as string,
          ServiceProvider.Moonshot as string,
        )
      ) {
        return NextResponse.json(
          {
            error: true,
            message: `you are not allowed to use ${jsonBody?.model} model`,
          },
          {
            status: 403,
          },
        );
      }
    } catch (e) {
      console.error(`[Moonshot] filter`, e);
    }
  }
  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);
  }
}