import { DynamicModule, Module } from '@nestjs/common';
import { PubSubService } from './pub-sub.service';
import {
  createAsyncPubSubProviders,
  createPubSubProvider,
} from './pub-sub.providers';
import { PubSubOptions } from './interfaces/pub-sub-options.interface';
import { PubSubAsyncConfig } from './interfaces/pub-sub-async-config.interface';
import { getPubSubConfigToken } from './utils/token';

@Module({
  providers: [PubSubService],
})
export class PubSubModule {
  public static forRoot(options: PubSubOptions): DynamicModule {
    const providers = [
      {
        provide: getPubSubConfigToken(options.name),
        useValue: options,
      },
      createPubSubProvider(options.name),
    ];
    return {
      global: true,
      module: PubSubModule,
      providers,
      exports: providers,
    };
  }
  public static forRootAsync(...configs: PubSubAsyncConfig[]): DynamicModule {
    const providers = createAsyncPubSubProviders(configs);
    return {
      global: true,
      module: PubSubModule,
      imports: configs
        .map((config) => config.imports)
        .flat()
        .filter((o, i, a) => a.indexOf(o) === i),
      providers,
      exports: providers,
    };
  }
  public static forFeature(): DynamicModule {
    return {
      module: PubSubModule,
    };
  }
}