import {APP_INITIALIZER, ModuleWithProviders, NgModule} from '@angular/core';
import {CommonModule} from '@angular/common';
import {LoaderService} from '../interceptors/loader/loader.service';
import {RouterLoaderService} from './router-loader.service';

@NgModule({
  imports: [
    CommonModule
  ],
  declarations: []
})
export class RouterLoaderModule {
  static forRoot(): ModuleWithProviders {
    return {
      ngModule: RouterLoaderModule,
      providers: [
        LoaderService,
        RouterLoaderService,
        {
          provide: APP_INITIALIZER,
          useFactory: initRouterLoader,
          multi: true,
          deps: [RouterLoaderService]
        }
      ]
    };
  }
}

export function initRouterLoader(service: RouterLoaderService) {
  const f = () => service.start();
  return f;
}