import { NestFactory } from '@nestjs/core';
import { AppModule } from '../src/app.module';
import { HttpExceptionFilter } from '../src/common/filters/http-exception.filter';
import { TransformInterceptor } from '../src/common/interceptors/transform.interceptor';
import { ValidationPipe } from '@nestjs/common';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
import * as bodyParser from 'body-parser';

let cachedApp;

async function bootstrap() {
  if (!cachedApp) {
    const app = await NestFactory.create(AppModule);

    app.enableCors({
      origin: true,
      credentials: true,
      methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'],
      allowedHeaders: [
        'Content-Type',
        'Authorization',
        'Accept',
        'Origin',
        'Referer',
        'User-Agent',
      ],
    });

    app.useGlobalFilters(new HttpExceptionFilter());
    app.useGlobalInterceptors(new TransformInterceptor());
    app.useGlobalPipes(
      new ValidationPipe({
        whitelist: true,
        forbidNonWhitelisted: true,
        transform: true,
      }),
    );

    app.use(bodyParser.json({ limit: '50mb' }));
    app.use(bodyParser.urlencoded({ limit: '50mb', extended: true }));

    // Swagger 配置
    const config = new DocumentBuilder()
      .setTitle('我的应用 API')
      .setDescription('这是我的应用程序的 API 文档')
      .setVersion('1.0')
      .addBearerAuth()
      .build();
    const document = SwaggerModule.createDocument(app, config);
    SwaggerModule.setup('api', app, document);

    await app.init();
    cachedApp = app;
  }

  return cachedApp;
}

export default async (req, res) => {
  const app = await bootstrap();
  const server = app.getHttpAdapter().getInstance();
  return server(req, res);
};