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@Directive({selector: '[ifRole]'})
export class IfRoleDirective {
  user$ : Subscription;
  @Input("ifRole") roleName : string;

  constructor( private templateRef : TemplateRef<any>,
               private viewContainer : ViewContainerRef,
               private authService : AuthService ) {
  }

  ngOnInit() {
    this.user$ = this.authService.user
      .do(() => this.viewContainer.clear())
      .filter(user => user.role === this.roleName).subscribe(() => {
        this.viewContainer.createEmbeddedView(this.templateRef);
      });
  }

  ngOnDestroy() {
    this.user$.unsubscribe();
  }
}