import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
import { of as observableOf } from 'rxjs';
import { TranslateModule } from '@ngx-translate/core';
import { RouterTestingModule } from '@angular/router/testing';
import { ActivatedRoute } from '@angular/router';
import { NO_ERRORS_SCHEMA } from '@angular/core';
import { By } from '@angular/platform-browser';
import { first, take } from 'rxjs/operators';
import { PageSizeSelectorComponent } from './page-size-selector.component';
import { PaginationComponentOptions } from '../pagination/pagination-component-options.model';
import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
import { EnumKeysPipe } from '../utils/enum-keys-pipe';
import { VarDirective } from '../utils/var.directive';
import { SEARCH_CONFIG_SERVICE } from '../../my-dspace-page/my-dspace-page.component';
import { PaginationService } from '../../core/pagination/pagination.service';
import { PaginationServiceStub } from '../testing/pagination-service.stub';

describe('PageSizeSelectorComponent', () => {

  let comp: PageSizeSelectorComponent;
  let fixture: ComponentFixture<PageSizeSelectorComponent>;

  const pagination: PaginationComponentOptions = new PaginationComponentOptions();
  pagination.id = 'search-results-pagination';
  pagination.currentPage = 1;
  pagination.pageSize = 10;
  const sort: SortOptions = new SortOptions('score', SortDirection.DESC);

  const queryParam = 'test query';
  const scopeParam = '7669c72a-3f2a-451f-a3b9-9210e7a4c02f';
  const paginatedSearchOptions = {
    query: queryParam,
    scope: scopeParam,
    pagination,
    sort
  };

  const paginationService = new PaginationServiceStub(pagination, sort);

  const activatedRouteStub = {
    queryParams: observableOf({
      query: queryParam,
      scope: scopeParam
    })
  };

  beforeEach(waitForAsync(() => {
    TestBed.configureTestingModule({
      imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([])],
      declarations: [PageSizeSelectorComponent, EnumKeysPipe, VarDirective],
      providers: [
        { provide: ActivatedRoute, useValue: activatedRouteStub },
        { provide: PaginationService, useValue: paginationService },
        {
          provide: SEARCH_CONFIG_SERVICE,
          useValue: {
            paginatedSearchOptions: observableOf(paginatedSearchOptions),
          }
        },
      ],
      schemas: [NO_ERRORS_SCHEMA]
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(PageSizeSelectorComponent);
    comp = fixture.componentInstance;

    // SearchPageComponent test instance
    fixture.detectChanges();

  });

  it('it should show the size settings with the respective selectable options', (done) => {
    comp.paginationOptions$.pipe(first()).subscribe((options: PaginationComponentOptions) => {
        const pageSizeSetting = fixture.debugElement.query(By.css('div.page-size-settings'));
        expect(pageSizeSetting).not.toBeNull();
        const childElements = pageSizeSetting.queryAll(By.css('option'));
        expect(childElements.length).toEqual(options.pageSizeOptions.length);
        done();
      }
    );
  });

  it('should have the proper rpp value selected by default', (done) => {
    comp.paginationOptions$.pipe(take(1)).subscribe(() => {
      const pageSizeSetting = fixture.debugElement.query(By.css('div.page-size-settings'));
      const childElementToBeSelected = pageSizeSetting.query(By.css('option[value="10"]'));
      expect(childElementToBeSelected).not.toBeNull();
      expect(childElementToBeSelected.nativeElement.selected).toBeTrue();
      done();
    });
  });

});