import { INestApplicationContext } from '@nestjs/common';
import { NestFactory } from '@nestjs/core';
import { resolveRole } from './runtime/role';
import { assertStartupEnvironment } from './runtime/startup-checks';
import { WorkerModule } from './worker/worker.module';

/**
 * Entry point of the worker role: domain events, calendar outbox and their
 * wake-ups, plus GET /health on WORKER_HEALTH_PORT - no HTTP API. Role and
 * environment are checked before any module is created, so a misconfigured
 * pod fails before it connects anywhere. `env` is for tests; the modules
 * themselves read process.env.
 */
export async function bootstrapWorker(
  env: NodeJS.ProcessEnv = process.env,
): Promise<INestApplicationContext> {
  const role = resolveRole('worker', env);
  assertStartupEnvironment(role, env);

  const app = await NestFactory.createApplicationContext(WorkerModule);
  app.enableShutdownHooks();
  return app;
}

// Started as `node dist/worker.js`; importing this file starts nothing.
if (require.main === module) {
  void bootstrapWorker();
}