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

import { Observable, of } from 'rxjs';
import {catchError, tap} from 'rxjs/operators';
import {ActivatedRouteSnapshot, Router, RouterStateSnapshot} from '@angular/router';

@Injectable()
export class AuthErrorInterceptor implements HttpInterceptor {
  private TIBCO_CLOUD_DOMAIN = 'cloud.tibco.com';
  private TIBCO_TEST_DOMAIN = 'tenant-integration.tcie.pro';
  private TIBCO_DEV_DOMAIN = 'emea.tibco.com';
  private TIBCO_CLOUD_LOGIN = 'https://account.cloud.tibco.com/idm/v1/login-saml?relayState=';

  constructor(private router: Router) {}

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(req).pipe(
      catchError((err: any) => {
          if (err instanceof HttpErrorResponse) {
            if (err.status === 419) {
              // timed out
              // should only be used if not on tibco cloud (and hence using our login route)
              // check if we are hosted on tibco.cloud.com
              const host = window.location.hostname.split('.');
              const hostDomain = host[host.length - 3] + '.' + host[host.length - 2] + '.' + host[host.length - 1];
              if (hostDomain === this.TIBCO_CLOUD_DOMAIN || hostDomain === this.TIBCO_TEST_DOMAIN || hostDomain === this.TIBCO_DEV_DOMAIN) {
                /*
                // redirect to Tibco Cloud Login
                // supply base64 encoded redirect string
                const reauthUrl = btoa('{ "resumeURL":"' + window.location.href + '", "tenantId":"BPM" }');
                console.log('redirecting to: ' + this.TIBCO_CLOUD_LOGIN + reauthUrl);
                window.location.href = this.TIBCO_CLOUD_LOGIN + reauthUrl;
                */
                console.warn('Tibco Cloud API call timed out - leaving for Tibco Cloud to handle');
              } else {
                console.warn('Tibco Cloud API call timed out - routing to login page');
                this.router.navigate(['/login'], {queryParams: {}});
              }
            } else {
              throw err;
            }
          }
          return of(err);
        }
      )
    );
  }
}