import { Injectable } from '@angular/core';

import {
	HttpErrorResponse,
	HttpEvent,
	HttpHandler,
	HttpInterceptor,
	HttpRequest,
	HttpResponse
} from '@angular/common/http';

import { Router } from '@angular/router';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';

@Injectable()
export class ErrorInterceptor implements HttpInterceptor {
	constructor(private router: Router) { }

	intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
		return next.handle(req).map((event: HttpEvent<any>) => {
			return event;
		}).catch((err: any, caught) => {
			if (err instanceof HttpErrorResponse) {
				this.router.navigate(['error', { stauts: err.status }]);
				return Observable.throw(err);
			}
		});
	}
}