import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError } from 'rxjs/operators';
import { AuthenticationService } from '../_services/authentication.service';
import { NotificationService } from '../_services/notification.service';

@Injectable()
export class ErrorInterceptor implements HttpInterceptor {
    constructor(private authenticationService: AuthenticationService, public _notificationService: NotificationService) { }
    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        // request = request.clone({
        //     setHeaders: {
        //        Authorization: `Bearer ${this.authenticationService.getToken()}`
        //      }
        //    });

        return next.handle(request).pipe(catchError(err => {
            console.log(err.error);

            if (err.status === 0) {
                this._notificationService.notify('danger', 'Server Not Responding');
            }
            if (err.status === 401) {
                // auto logout if 401 response returned from api
                this._notificationService.notify('danger', 'Unauthorized');
                this.authenticationService.logout();
            }
            if (err.status === 400) {
                this._notificationService.notify('danger', 'Error Reported');
            }
            if (err.status === 404) {
                this._notificationService.notify('danger', err.message);
            }
            const error = err;
            return throwError(error);
        }));
    }
}