import { HttpClient } from '@angular/common/http';
import { ChangeDetectionStrategy, NO_ERRORS_SCHEMA } from '@angular/core';
import { ComponentFixture, fakeAsync, TestBed, tick, waitForAsync } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { Store } from '@ngrx/store';
import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
import { Observable, of } from 'rxjs';
import { RemoteDataBuildService } from '../../../../core/cache/builders/remote-data-build.service';
import { ObjectCacheService } from '../../../../core/cache/object-cache.service';
import { BitstreamDataService } from '../../../../core/data/bitstream-data.service';
import { CommunityDataService } from '../../../../core/data/community-data.service';
import { DefaultChangeAnalyzer } from '../../../../core/data/default-change-analyzer.service';
import { DSOChangeAnalyzer } from '../../../../core/data/dso-change-analyzer.service';
import { ItemDataService } from '../../../../core/data/item-data.service';
import { RelationshipDataService } from '../../../../core/data/relationship-data.service';
import { RemoteData } from '../../../../core/data/remote-data';
import { Bitstream } from '../../../../core/shared/bitstream.model';
import { HALEndpointService } from '../../../../core/shared/hal-endpoint.service';
import { Item } from '../../../../core/shared/item.model';
import { MetadataMap  } from '../../../../core/shared/metadata.models';
import { UUIDService } from '../../../../core/shared/uuid.service';
import { TranslateLoaderMock } from '../../../../shared/mocks/translate-loader.mock';
import { NotificationsService } from '../../../../shared/notifications/notifications.service';
import { createSuccessfulRemoteDataObject$ } from '../../../../shared/remote-data.utils';
import { TruncatableService } from '../../../../shared/truncatable/truncatable.service';
import { TruncatePipe } from '../../../../shared/utils/truncate.pipe';
import { GenericItemPageFieldComponent } from '../../field-components/specific-field/generic/generic-item-page-field.component';
import {
  createRelationshipsObservable, getIIIFEnabled, getIIIFSearchEnabled, mockRouteService
} from '../shared/item.component.spec';
import { PublicationComponent } from './publication.component';
import { createPaginatedList } from '../../../../shared/testing/utils.test';
import { RouteService } from '../../../../core/services/route.service';
import { VersionHistoryDataService } from '../../../../core/data/version-history-data.service';
import { VersionDataService } from '../../../../core/data/version-data.service';
import { RouterTestingModule } from '@angular/router/testing';
import { WorkspaceitemDataService } from '../../../../core/submission/workspaceitem-data.service';
import { SearchService } from '../../../../core/shared/search/search.service';
import { BrowseDefinitionDataService } from '../../../../core/browse/browse-definition-data.service';
import {
  BrowseDefinitionDataServiceStub
} from '../../../../shared/testing/browse-definition-data-service.stub';
import { BrowseService } from '../../../../core/browse/browse.service';
import { BrowseServiceStub } from '../../../../shared/testing/browse-service.stub';

const noMetadata = new MetadataMap();

function getItem(metadata: MetadataMap) {
  return Object.assign(new Item(), {
    bundles: createSuccessfulRemoteDataObject$(createPaginatedList([])),
    metadata: metadata,
    relationships: createRelationshipsObservable()
  });
}

describe('PublicationComponent', () => {
  let comp: PublicationComponent;
  let fixture: ComponentFixture<PublicationComponent>;

  beforeEach(waitForAsync(() => {
    const mockBitstreamDataService = {
      getThumbnailFor(item: Item): Observable<RemoteData<Bitstream>> {
        return createSuccessfulRemoteDataObject$(new Bitstream());
      }
    };
    TestBed.configureTestingModule({
      imports: [
        TranslateModule.forRoot({
          loader: {
            provide: TranslateLoader,
            useClass: TranslateLoaderMock
          }
        }),
        RouterTestingModule,
      ],
      declarations: [PublicationComponent, GenericItemPageFieldComponent, TruncatePipe],
      providers: [
        { provide: ItemDataService, useValue: {} },
        { provide: TruncatableService, useValue: {} },
        { provide: RelationshipDataService, useValue: {} },
        { provide: ObjectCacheService, useValue: {} },
        { provide: UUIDService, useValue: {} },
        { provide: Store, useValue: {} },
        { provide: RemoteDataBuildService, useValue: {} },
        { provide: CommunityDataService, useValue: {} },
        { provide: HALEndpointService, useValue: {} },
        { provide: NotificationsService, useValue: {} },
        { provide: HttpClient, useValue: {} },
        { provide: DSOChangeAnalyzer, useValue: {} },
        { provide: DefaultChangeAnalyzer, useValue: {} },
        { provide: VersionHistoryDataService, useValue: {} },
        { provide: VersionDataService, useValue: {} },
        { provide: BitstreamDataService, useValue: mockBitstreamDataService },
        { provide: WorkspaceitemDataService, useValue: {} },
        { provide: SearchService, useValue: {} },
        { provide: RouteService, useValue: mockRouteService },
        { provide: BrowseDefinitionDataService, useValue: BrowseDefinitionDataServiceStub },
        { provide: BrowseService, useValue: BrowseServiceStub },
      ],

      schemas: [NO_ERRORS_SCHEMA]
    }).overrideComponent(PublicationComponent, {
      set: {changeDetection: ChangeDetectionStrategy.Default}
    });
  }));

  describe('default view', () => {
    beforeEach(waitForAsync(() => {
      TestBed.compileComponents();
      fixture = TestBed.createComponent(PublicationComponent);
      comp = fixture.componentInstance;
      comp.object = getItem(noMetadata);
      fixture.detectChanges();
    }));

    it('should contain a component to display the date', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-item-page-date-field'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });

    it('should not contain a metadata only author field', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-item-page-author-field'));
      expect(fields.length).toBe(0);
    });

    it('should contain a mixed metadata and relationship field for authors', () => {
      const fields = fixture.debugElement.queryAll(By.css('.ds-item-page-mixed-author-field'));
      expect(fields.length).toBe(1);
    });

    it('should contain a component to display the abstract', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-item-page-abstract-field'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });

    it('should contain a component to display the uri', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-item-page-uri-field'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });

    it('should contain a component to display the collections', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-item-page-collections'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });
  });

  describe('with IIIF viewer', () => {

    beforeEach(waitForAsync(() => {
      const iiifEnabledMap: MetadataMap = {
        'dspace.iiif.enabled': [getIIIFEnabled(true)],
        'iiif.search.enabled': [getIIIFSearchEnabled(false)],
      };
      TestBed.compileComponents();
      fixture = TestBed.createComponent(PublicationComponent);
      comp = fixture.componentInstance;
      comp.object = getItem(iiifEnabledMap);
      fixture.detectChanges();
    }));

    it('should contain an iiif viewer component', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-mirador-viewer'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });
    it('should not retrieve the query term for previous route', fakeAsync((): void => {
      //tick(10)
      expect(comp.iiifQuery$).toBeFalsy();
    }));

  });

  describe('with IIIF viewer and search', () => {

    const localMockRouteService = {
      getPreviousUrl(): Observable<string> {
        return of('/search?query=test%20query&fakeParam=true');
      }
    };
    beforeEach(waitForAsync(() => {
      const iiifEnabledMap: MetadataMap = {
        'dspace.iiif.enabled': [getIIIFEnabled(true)],
        'iiif.search.enabled': [getIIIFSearchEnabled(true)],
      };
      TestBed.overrideProvider(RouteService, {useValue: localMockRouteService});
      TestBed.compileComponents();
      fixture = TestBed.createComponent(PublicationComponent);
      comp = fixture.componentInstance;
      comp.object = getItem(iiifEnabledMap);
      fixture.detectChanges();
    }));

    it('should contain an iiif viewer component', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-mirador-viewer'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });

    it('should retrieve the query term for previous route', fakeAsync((): void => {
      expect(comp.iiifQuery$.subscribe(result => expect(result).toEqual('test query')));
    }));

  });

  describe('with IIIF viewer and search but no previous search query', () => {
    const localMockRouteService = {
      getPreviousUrl(): Observable<string> {
        return of('/item');
      }
    };
    beforeEach(waitForAsync(() => {
      const iiifEnabledMap: MetadataMap = {
        'dspace.iiif.enabled': [getIIIFEnabled(true)],
        'iiif.search.enabled': [getIIIFSearchEnabled(true)],
      };
      TestBed.overrideProvider(RouteService, {useValue: localMockRouteService});
      TestBed.compileComponents();
      fixture = TestBed.createComponent(PublicationComponent);
      comp = fixture.componentInstance;
      comp.object = getItem(iiifEnabledMap);
      fixture.detectChanges();
    }));

    it('should contain an iiif viewer component', () => {
      const fields = fixture.debugElement.queryAll(By.css('ds-mirador-viewer'));
      expect(fields.length).toBeGreaterThanOrEqual(1);
    });

    it('should not retrieve the query term for previous route', fakeAsync( () => {
      let emitted;
      comp.iiifQuery$.subscribe(result => emitted = result);
      tick(10);
      expect(emitted).toBeUndefined();
    }));

  });
});
