import type { INestApplication } from '@nestjs/common/interfaces';
import { NestFactory } from '@nestjs/core';

import { PlatformContext } from '../platform.context';
import type { PlatformAppMetadata, PlatformAppOptions } from '../types';

/**
 * Platform application itself.
 *
 * Just instantiate it, call run() method, and you are
 * ready to go!
 */
export class PlatformApp {
  readonly context: PlatformContext;

  constructor(readonly platformAppOptions: PlatformAppOptions) {
    this.context = new PlatformContext(platformAppOptions);
  }

  /**
   * Get all important information about PlatformApp instance
   * @returns Readonly metadata
   */
  async getMetadata(): Promise<Readonly<PlatformAppMetadata>> {
    return await this.context.getMetadata();
  }

  /**
   * Runs application.
   * @returns Promise<void>
   */
  async run(): Promise<void> {
    const context = this.context;
    const app = await this.createApplication();

    await context.runConfiguredApplication(app);
  }

  /**
   * Создание и конфигурирование приложения по стандартному сценарию
   * Не путать с запуском
   * @private
   */
  private async createApplication(): Promise<INestApplication> {
    const context = this.context;
    const nestContext = await context.getNestFactoryCreateOptions();
    const app = await NestFactory.create(
      await context.getRoot(),
      ...nestContext,
    );

    await context.configureApp(app);
    return app;
  }
}