import { NestFactory } from '@nestjs/core';
import { INestApplicationContext } from '@nestjs/common';
import { AppModule } from './app.module';

let appContext: INestApplicationContext | null = null;

export async function initializeDIContainer(): Promise<void> {
  if (appContext) {
    return; // Already initialized
  }

  appContext = await NestFactory.createApplicationContext(AppModule);
}

export function getDIContainer(): INestApplicationContext {
  if (!appContext) {
    throw new Error('DI container not initialized. Call initializeDIContainer() first.');
  }
  return appContext;
}

export async function getService<T>(token: string | symbol): Promise<T> {
  const container = getDIContainer();
  return container.get<T>(token);
}