// angular modules
import { NgModule, APP_INITIALIZER, ModuleWithProviders, Injector, Optional, SkipSelf } from '@angular/core';
import { DatePipe } from '@angular/common';
import { HTTP_INTERCEPTORS } from '@angular/common/http';

// external modules
import { OAuthModule, OAuthService } from 'angular-oauth2-oidc';

//components
import { ItemTypeService } from './services/itemtype.service';
import { FolderService } from './services/folder.service';
import { TimespanService } from './services/timespan.service';
import { ItemService } from './services/item.service';
import { EventService } from './services/event.service';
import { TypeaheadService } from './services/typeahead.service';
import { UserService } from './services/user.service';
import { AppConfig } from './shared/app.config';
import { AccessTokenInterceptor } from "./shared/accesstoken.interceptor";
import { appConfigFactory } from "./shared/app.config.factory";
import { AuthGuard } from './services/auth-guard.service';
import { NavBarGuard } from './services/nav-bar-guard.service';
import { FullScreenGuard } from './services/full-screen-guard.service';
import { AuthCallbackGuard } from './components/auth-callback/auth-callback.guard';
import { ResumableFileUploadService } from './components/resumable-file-upload/resumable-file-upload.service';
import { NgbDateNativeAdapter } from './services/date-adapter.service'
import { AuthConfigFactory } from './shared/authconfigFactory';
import { CodeListItemService } from './services/codelistitem.service';

export {
  FolderService,
  ItemTypeService,
  TimespanService,
  ItemService,
  EventService,
  TypeaheadService,
  UserService,
  CodeListItemService,
  AppConfig,
  AccessTokenInterceptor,
  AuthGuard,
  NavBarGuard,
  FullScreenGuard,
  AuthCallbackGuard,
  ResumableFileUploadService,
  NgbDateNativeAdapter
};

@NgModule({
  imports: [
    OAuthModule.forRoot(),
  ]
})
export class AppCommonServiceModule {
  constructor(@Optional() @SkipSelf() parentModule: AppCommonServiceModule) {
    if (parentModule) {
      throw new Error(
        'AppCommonServiceModule is already loaded. Import it in the AppModule only');
    }
  }
  static forRoot(): ModuleWithProviders {
    return {
      ngModule: AppCommonServiceModule,
      providers: [
        AppConfig,
        {
          provide: APP_INITIALIZER,
          useFactory: appConfigFactory,
          deps: [Injector, AppConfig, OAuthService, AuthConfigFactory],
          multi: true
        },
        {
          provide: HTTP_INTERCEPTORS,
          useClass: AccessTokenInterceptor,
          multi: true
        },
        DatePipe
      ]
    };
  }
}