import { NgModule, ModuleWithProviders, SkipSelf, Optional } from '@angular/core';
import { Configuration } from './configuration';
import { HttpClient } from '@angular/common/http';

import { BalanceService } from './api/balance.service';
import { BorrowerService } from './api/borrower.service';
import { ChatService } from './api/chat.service';
import { CompanyGroupService } from './api/companyGroup.service';
import { HashtagService } from './api/hashtag.service';
import { LeadService } from './api/lead.service';
import { LoanOfficerService } from './api/loanOfficer.service';
import { NotificationService } from './api/notification.service';
import { PromotionService } from './api/promotion.service';
import { QuoteService } from './api/quote.service';
import { RoleService } from './api/role.service';

@NgModule({
  imports:      [],
  declarations: [],
  exports:      [],
  providers: []
})
export class ApiModule {
    public static forRoot(configurationFactory: () => Configuration): ModuleWithProviders<ApiModule> {
        return {
            ngModule: ApiModule,
            providers: [ { provide: Configuration, useFactory: configurationFactory } ]
        };
    }

    constructor( @Optional() @SkipSelf() parentModule: ApiModule,
                 @Optional() http: HttpClient) {
        if (parentModule) {
            throw new Error('ApiModule is already loaded. Import in your base AppModule only.');
        }
        if (!http) {
            throw new Error('You need to import the HttpClientModule in your AppModule! \n' +
            'See also https://github.com/angular/angular/issues/20575');
        }
    }
}