import cluster from 'node:cluster';
import path from 'node:path';

import { HttpStatus, Logger, UnprocessableEntityException, ValidationPipe } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { NestFactory } from '@nestjs/core';
import { NestFastifyApplication } from '@nestjs/platform-fastify';

import { useContainer } from 'class-validator';

import { AppModule } from './app.module';

import { fastifyApp } from './common/adapters/fastify.adapter';
import { RedisIoAdapter } from './common/adapters/socket.adapter';
import { LoggingInterceptor } from './common/interceptors/logging.interceptor';
import type { ConfigKeyPaths } from './config';
import { isDev, isMainProcess } from './global/env';
import { setupSwagger } from './setup-swagger';
import { LoggerService } from './shared/logger/logger.service';

declare const module: any;

async function bootstrap() {
  const app = await NestFactory.create<NestFastifyApplication>(AppModule, fastifyApp, {
    bufferLogs: true,
    snapshot: true
    // forceCloseConnections: true,
  });

  const configService = app.get(ConfigService<ConfigKeyPaths>);

  const { port, globalPrefix } = configService.get('app', { infer: true });

  // class-validator 的 DTO 类中注入 nest 容器的依赖 (用于自定义验证器)
  useContainer(app.select(AppModule), { fallbackOnErrors: true });

  app.enableCors({ origin: '*', credentials: true });
  app.setGlobalPrefix(globalPrefix);
  app.useStaticAssets({ root: path.join(__dirname, '..', 'public') });
  // Starts listening for shutdown hooks
  !isDev && app.enableShutdownHooks();

  if (isDev) app.useGlobalInterceptors(new LoggingInterceptor());

  app.useGlobalPipes(
    new ValidationPipe({
      transform: true,
      whitelist: true,
      transformOptions: { enableImplicitConversion: true },
      // forbidNonWhitelisted: true, // 禁止 无装饰器验证的数据通过
      errorHttpStatusCode: HttpStatus.UNPROCESSABLE_ENTITY,
      stopAtFirstError: true,
      exceptionFactory: errors =>
        new UnprocessableEntityException(
          errors.map(e => {
            const rule = Object.keys(e.constraints!)[0];
            const msg = e.constraints![rule];
            return msg;
          })[0]
        )
    })
  );

  app.useWebSocketAdapter(new RedisIoAdapter(app));

  setupSwagger(app, configService);

  await app.listen(port, '0.0.0.0', async () => {
    app.useLogger(app.get(LoggerService));
    const url = await app.getUrl();
    const { pid } = process;
    const env = cluster.isPrimary;
    const prefix = env ? 'P' : 'W';

    if (!isMainProcess) return;

    const logger = new Logger('NestApplication');
    logger.log(`[${prefix + pid}] Server running on ${url}`);

    if (isDev) logger.log(`[${prefix + pid}] OpenAPI: ${url}/api-docs`);
  });

  if (module.hot) {
    module.hot.accept();
    module.hot.dispose(() => app.close());
  }
}

bootstrap();