import { ValidationPipe } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { NestFactory } from '@nestjs/core';
import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
import * as express from 'express';
import { AppModule } from './app.module';
import { AllExceptionsFilter } from './common/filters/all-exceptions.filter';
import { TransformInterceptor } from './common/interceptors/transform.interceptor';

async function bootstrap(): Promise<void> {
  // 设计清单 designData 契约上限 1MB（api-contract-v1 §5），
  // body 限制放宽到 2MB，超 1MB 的业务校验在 design-list service 返回 400
  const app = await NestFactory.create(AppModule, { bodyParser: false });
  app.use(express.json({ limit: '2mb' }));
  app.use(express.urlencoded({ extended: true, limit: '2mb' }));
  const config = app.get(ConfigService);

  app.setGlobalPrefix('api', { exclude: ['health'] });
  app.enableCors();

  // 全局管道：剥离未声明字段 + 自动类型转换 + 拒绝多余字段
  app.useGlobalPipes(
    new ValidationPipe({
      whitelist: true,
      transform: true,
      forbidNonWhitelisted: true,
    }),
  );

  // 统一响应包裹 + 统一异常输出
  app.useGlobalInterceptors(new TransformInterceptor());
  app.useGlobalFilters(new AllExceptionsFilter());

  // Swagger 文档，生产环境可置空 SWAGGER_PATH 关闭
  const swaggerPath = config.get<string>('app.swaggerPath');
  if (swaggerPath) {
    const docConfig = new DocumentBuilder()
      .setTitle('wxmp-backend API')
      .setDescription('微信小程序后端接口文档')
      .setVersion('0.1.0')
      .addBearerAuth()
      .build();
    const document = SwaggerModule.createDocument(app, docConfig);
    SwaggerModule.setup(swaggerPath, app, document);
  }

  const port = config.get<number>('app.port') ?? 3000;
  await app.listen(port);
  // eslint-disable-next-line no-console
  console.log(`应用已启动: http://localhost:${port} | Swagger: /${swaggerPath}`);
}

void bootstrap();