import { Test } from '@nestjs/testing';
import { Remote, Image } from '@lxdhub/db';
import { plainToClass } from 'class-transformer';

import { PaginationOptionsDto } from '../common';
import { ImageAvailabilityService } from '../image-availability/image-availability.service';
import { LXDService } from '../lxd/lxd.service';
import { SearchDictionary, SearchService } from '../search';
import { ImageDetailFactory, ImageListItemFactory } from './factories';
import { ImageRepository } from './image.repository';
import { ImageService } from './image.service';
import { RemoteService } from '../remote';
import { ImageListItemDto, ImageDetailDto } from './dtos';

const searchDitionary: SearchDictionary[] = [
  {
    aliases: [''],
    searchLiteralKey: ''
  }
];

class ImageRepositoryMock {
  async findByRemote() {}
  async findOneByFingerprint() { }
  async findOneItem() { }
}

class SearchServiceMock {
  getLiteral(query: string, dictionaries: SearchDictionary[], key?: string) {
    return null;
  }
}

class RemoteRepositoryMock {
  findOneItem() {}
}

class LXDServiceMock {
  async cloneImage() {}
}

class ImageAvailabilityServiceMock {
  getOrCreate() {}
}

const remoteServiceMock = () => ({
  findByName: () => ({ id: 1 }),
  findById: id => ({ id })
});

/**
 * Test cases for the image service
 */
describe('ImageService', () => {
  let imageService: ImageService;
  let imageListItemFactory: ImageListItemFactory;
  let imageRepository: ImageRepository;
  let imageDetailFactory: ImageDetailFactory;
  let lxdService: LXDService;
  let imageAvailabilityService: ImageAvailabilityService;
  let remoteService: RemoteService;

  const remoteName = 'my-remote';
  const remoteId = 1;
  const images = [
    {
      fingerprint: 'fingerprint1',
      description: 'desc1',
      uploadedAt: new Date(),
      id: 1
    },
    {
      fingerprint: 'fingerprint2',
      description: 'desc2',
      uploadedAt: new Date(),
      id: 2
    }
  ];

  beforeEach(async done => {
    // Mock Image Module
    const module = await Test.createTestingModule({
      providers: [
        ImageService,
        {
          provide: ImageRepository,
          useClass: ImageRepositoryMock
        },
        ImageListItemFactory,
        ImageDetailFactory,
        { provide: RemoteService, useFactory: remoteServiceMock },
        {
          provide: SearchService,
          useClass: SearchServiceMock
        },
        {
          provide: 'ImageSearchDictionary',
          useValue: searchDitionary
        },
        {
          provide: 'LXDService',
          useClass: LXDServiceMock
        },
        {
          provide: 'ImageAvailabilityService',
          useClass: ImageAvailabilityServiceMock
        }
      ]
    }).compile();

    // Get the imageService in the Testing Module Context
    imageListItemFactory = module.get<ImageListItemFactory>(
      ImageListItemFactory
    );
    imageDetailFactory = module.get<ImageDetailFactory>(ImageDetailFactory);
    imageRepository = module.get<ImageRepository>(ImageRepository);
    lxdService = module.get<LXDService>(LXDService);
    imageAvailabilityService = module.get<ImageAvailabilityService>(
      ImageAvailabilityService
    );
    imageService = module.get<ImageService>(ImageService);
    remoteService = module.get<RemoteService>(RemoteService);
    done();
  });

  describe('findByRemote', () => {
    it('should return ImageListItem', async () => {
      jest
        .spyOn(imageRepository, 'findByRemote')
        .mockImplementation(() =>
          Promise.resolve([images as Image[], images.length])
        );
      jest
        .spyOn(imageListItemFactory, 'entitiesToDto')
        .mockImplementation(() => images as ImageListItemDto[]);
      jest
        .spyOn(remoteService, 'findByName')
        .mockReturnValue(
          Promise.resolve({ id: 1, name: remoteName } as Remote)
        );

      // Convert to PagintaionOptionsDto
      // with using the class-validator validation
      const options = plainToClass(PaginationOptionsDto, {
        limit: 2,
        offset: 0
      });
      expect(await imageService.findByRemote(remoteName, options)).toEqual({
        results: images,
        offset: 0,
        limit: 2,
        total: images.length
      });
    });

    it('should call ImageRepository correctly without search-query-string', async () => {
      jest
        .spyOn(imageRepository, 'findByRemote')
        .mockImplementation(() => Promise.resolve([[], 0]));
      jest
        .spyOn(imageListItemFactory, 'entitiesToDto')
        .mockImplementation(() => []);
      jest
        .spyOn(remoteService, 'findByName')
        .mockImplementation(name =>
          Promise.resolve({ id: remoteId, name } as Remote)
        );

      // Convert to PagintaionOptionsDto
      // with using the class-validator validation
      const options = plainToClass(PaginationOptionsDto, {
        limit: 2,
        offset: 0
      });
      await imageService.findByRemote(remoteName, options);
      expect(remoteService.findByName).toHaveBeenCalledWith(remoteName);
      expect(imageRepository.findByRemote).toHaveBeenCalledWith(
        remoteId,
        options,
        {}
      );
    });
  });

  describe('findOne', () => {
    /**
     * Image service should return one image and
     * wrap it in a Result
     */
    it('should return image detail', async () => {
      const result = {
        fingerprint: 'fingerprint1'
      };

      const imageRepositoryMock = jest
        .spyOn(imageRepository, 'findOneByFingerprint')
        .mockImplementation(() => Promise.resolve(result as Image));
      const imageDetailFactoryMock = jest
        .spyOn(imageDetailFactory, 'entityToDto')
        .mockImplementation(() => result as ImageDetailDto);

      expect(await imageService.findOne('fingerprint1')).toEqual({
        results: result
      });
      // Expect mock to be called once each
      expect(imageDetailFactoryMock.mock.calls.length).toBe(1);
      expect(imageRepositoryMock.mock.calls.length).toBe(1);
    });

    /**
     * When no image was found, throw an error
     */
    it('should throw an exception if no image is found', async () => {
      jest
        .spyOn(imageRepository, 'findOneItem')
        .mockImplementation(() => undefined);

      // workaround for async error catching
      // https://github.com/facebook/jest/issues/1377
      try {
        await imageService.findOne('');
      } catch (err) {
        expect(() => {
          throw err;
        }).toThrowError();
      }
    });
  });

  describe('cloneImage', () => {
    beforeEach(() => {
      jest.spyOn(lxdService, 'cloneImage').mockImplementation(() => null);
      jest
        .spyOn(remoteService, 'findById')
        .mockImplementation(id => Promise.resolve({ id } as Remote));
      jest
        .spyOn(imageRepository, 'findOneItem')
        .mockImplementation(() => Promise.resolve({ id: 1 } as Image));
      jest
        .spyOn(imageAvailabilityService, 'getOrCreate')
        .mockImplementation(() => Promise.resolve({ id: 1 } as any));
      jest
        .spyOn(imageService, 'findOne')
        .mockImplementation(() => Promise.resolve({ id: 1 } as any));
    });

    it('should call lxcservice correctly', async () => {
      await imageService.cloneImage(1, {
        sourceRemoteId: 2,
        destinationRemoteId: 3
      });
      expect(lxdService.cloneImage).toHaveBeenCalledWith(
        { id: 1 },
        { id: 2 },
        { id: 3 }
      );
    });

    it('should throw an error, when no image is found', async () => {
      jest.spyOn(imageRepository, 'findOneItem').mockImplementation(() => null);
      imageService
        .cloneImage(1, { sourceRemoteId: 2, destinationRemoteId: 3 })
        .catch(err => expect(err).toBeDefined());
    });

    it('should throw an error, when no sourceremote is found', async () => {
      jest.spyOn(remoteService, 'findById').mockImplementation(() => null);
      imageService
        .cloneImage(1, { sourceRemoteId: 2, destinationRemoteId: 3 })
        .catch(err => expect(err).toBeDefined());
    });

    it('should throw an error, when no desitinationremote is found', async () => {
      jest
        .spyOn(remoteService, 'findById')
        .mockImplementation(id =>
          Promise.resolve(id === 3 ? null : ({} as any))
        );
      imageService
        .cloneImage(1, { sourceRemoteId: 2, destinationRemoteId: 3 })
        .catch(err => expect(err).toBeDefined());
    });
  });
});