import { HostWindowService } from '../shared/host-window.service';
import { SearchService } from './search-service/search.service';
import { SearchSidebarService } from './search-sidebar/search-sidebar.service';
import { SearchPageComponent } from './search-page.component';
import { ChangeDetectionStrategy, Component, Inject, Input, OnInit } from '@angular/core';
import { pushInOut } from '../shared/animations/push';
import { RouteService } from '../shared/services/route.service';
import { SearchConfigurationService } from './search-service/search-configuration.service';
import { Observable } from 'rxjs';
import { PaginatedSearchOptions } from './paginated-search-options.model';
import { SEARCH_CONFIG_SERVICE } from '../+my-dspace-page/my-dspace-page.component';
import { map } from 'rxjs/operators';

/**
 * This component renders a search page using a configuration as input.
 */
@Component({
  selector: 'ds-configuration-search-page',
  styleUrls: ['./search-page.component.scss'],
  templateUrl: './search-page.component.html',
  changeDetection: ChangeDetectionStrategy.OnPush,
  animations: [pushInOut],
  providers: [
    {
      provide: SEARCH_CONFIG_SERVICE,
      useClass: SearchConfigurationService
    }
  ]
})

export class ConfigurationSearchPageComponent extends SearchPageComponent implements OnInit {
  /**
   * The configuration to use for the search options
   * If empty, the configuration will be determined by the route parameter called 'configuration'
   */
  @Input() configuration: string;

  constructor(protected service: SearchService,
              protected sidebarService: SearchSidebarService,
              protected windowService: HostWindowService,
              @Inject(SEARCH_CONFIG_SERVICE) public searchConfigService: SearchConfigurationService,
              protected routeService: RouteService) {
    super(service, sidebarService, windowService, searchConfigService, routeService);
  }

  /**
   * Listening to changes in the paginated search options
   * If something changes, update the search results
   *
   * Listen to changes in the scope
   * If something changes, update the list of scopes for the dropdown
   */
  ngOnInit(): void {
    super.ngOnInit();
  }

  /**
   * Get the current paginated search options after updating the configuration using the configuration input
   * This is to make sure the configuration is included in the paginated search options, as it is not part of any
   * query or route parameters
   * @returns {Observable<PaginatedSearchOptions>}
   */
  protected getSearchOptions(): Observable<PaginatedSearchOptions> {
    return this.searchConfigService.paginatedSearchOptions.pipe(
      map((options: PaginatedSearchOptions) => {
        const config = this.configuration || options.configuration;
        return Object.assign(options, { configuration: config });
      })
    );
  }
}