import { Injectable } from '@angular/core';
import { BreadcrumbFactory, BreadcrumbItem, Breadcrumb } from '@c8y/ngx-components';
import { Router } from '@angular/router';

/**
 * A breadcrumb is a type of secondary navigation scheme that reveals the user’s location
 * in the application.
 */
@Injectable()
export class ExampleBreadcrumbFactory implements BreadcrumbFactory {
  // Inject the angular Router
  constructor(private router: Router) {}

  // Implement the get()-method, otherwise the ExampleBreadcrumbFactory
  // implements the BreadcrumbFactory interface incorrectly (!)
  get() {
    // Mandatory for a Breadcrumb is an array of BreadcrumbItem
    const breadcrumb: Breadcrumb = { items: [] };
    // Mandatory for a BreadcrumbItem is:
    //  - path (string)
    //  - label (string)
    const breadcrumbItems: BreadcrumbItem[] = [];

    /**
     * Use angular router to decide if breadcrumbs should be shown.
     * The following breadcrumbs are displayed if the URL matches
     * something like: .../apps/tutorial-application/#/world/
     */
    if (this.router.url.match(/world/g)) {
      breadcrumbItems.push({
        label: 'World',
        icon: 'plane',
        path: '/world'
      });

      // if the URL is: .../apps/tutorial-application/#/world/awesome
      // we add another breadcrumb to show!
      if (this.router.url.match(/awesome/g)) {
        breadcrumbItems.push({
          label: 'Awesome',
          path: '/world/awesome'
        });
      }

      // if the URL is: .../apps/tutorial-application/#/world/outstanding
      // we add another breadcrumb to show!
      if (this.router.url.match(/outstanding/g)) {
        breadcrumbItems.push({
          label: 'Outstanding',
          path: '/world/outstanding'
        });
      }
    }

    breadcrumb.items = breadcrumbItems;
    return breadcrumb;
  }
}