import { HttpRequest, HttpHandler, HttpInterceptor, HttpEvent, HttpResponse } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/do';
import { AppComponent } from '../../app.component';

@Injectable()
export class AuthInterceptorService implements HttpInterceptor {
  hasHeader = true;

  constructor(private router: Router) { }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next
      .handle(req)
      .do(event => {
        if (event instanceof HttpResponse) {
          const code: number = event.body.code;
          if (code === 401) {
            this.router.navigate(['/login']);
          }
        }
      });
  }
}