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import { Directive, Input } from '@angular/core';
import { TemplateRef, ViewContainerRef } from '@angular/core';
import { select } from "ng2-redux";
import { Observable } from "rxjs";

@Directive({selector: '[showIfLoggedIn]'})

export class ShowIfLoggedInDirective {
  subscription;
  @Input('showIfLoggedIn') renderTemplate; 
  @select(["session", "isLoggedIn"]) isLoggedIn$ : Observable<boolean>

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

  ngOnInit() {
    this.subscription = this.isLoggedIn$.subscribe(isLoggedIn => {   
     if( isLoggedIn ) {
        if( this.renderTemplate ) {
          this.viewContainer.createEmbeddedView(this.templateRef);
        } else {
          this.viewContainer.clear();
        }
      } else {
        if( this.renderTemplate ) {
          this.viewContainer.clear();
        } else {
          this.viewContainer.createEmbeddedView(this.templateRef);
        }
      }
    });
  }
}

 ngOnDestory() {
    this.subscription.unsubscribe();
 }
}