import { Request } from 'express';
import * as fs from 'fs';
import { multerUtils } from './profile-image-upload.config';

const { fileFilter, destination, filename } = multerUtils;

const mock = {
  req: {} as Request,
  userRequest: {
    user: {
      id: 'test-user',
    },
  } as Request,
  file: { originalname: 'test.jpg' } as Express.Multer.File,
};

jest.mock('fs');

describe('profileImageUploadOption', () => {
  let callback: jest.Mock;
  let existsSync: jest.Mock;
  let mkdirSync: jest.Mock;

  beforeEach(() => {
    jest.mock('fs');
    mkdirSync = fs.mkdirSync as jest.Mock;
    existsSync = fs.existsSync as jest.Mock;
    callback = jest.fn();

    existsSync.mockImplementation(() => true);
  });

  afterEach(() => {
    jest.resetModules();
  });

  describe('fileFilter', () => {
    it('should require a user', () => {
      fileFilter(mock.req, mock.file, callback);

      expect(callback).toHaveBeenCalled();
      const [error, name] = callback.mock.calls[0];
      expect(error).toBeDefined();
      expect(name).toBeUndefined();
    });

    it('should allow images', async () => {
      const file = { mimetype: 'image/jpeg', originalname: 'test.jpg' } as any;
      fileFilter(mock.userRequest, file, callback);
      expect(callback).toHaveBeenCalledWith(null, true);
    });

    it('should not allow gifs', async () => {
      const file = { mimetype: 'image/gif', originalname: 'test.gif' } as any;
      const callback = jest.fn();
      fileFilter(mock.userRequest, file, callback);

      expect(callback).toHaveBeenCalled();
      const [error, accepted] = callback.mock.calls[0];
      expect(error).toBeDefined();
      expect(accepted).toBe(false);
    });
  });

  describe('destination', () => {
    it('should require a user', () => {
      destination(mock.req, mock.file, callback);

      expect(callback).toHaveBeenCalled();
      const [error, name] = callback.mock.calls[0];
      expect(error).toBeDefined();
      expect(name).toBeUndefined();
    });

    it('should create non-existing directories', () => {
      existsSync.mockImplementation(() => false);

      destination(mock.userRequest, mock.file, callback);

      expect(existsSync).toHaveBeenCalled();
      expect(mkdirSync).toHaveBeenCalled();
    });

    it('should return the destination', () => {
      destination(mock.userRequest, mock.file, callback);

      expect(mkdirSync).not.toHaveBeenCalled();
      expect(callback).toHaveBeenCalledWith(null, './upload/test-user/profile');
    });
  });

  describe('filename', () => {
    it('should require a user', () => {
      filename(mock.req, mock.file, callback);

      expect(callback).toHaveBeenCalled();
      const [error, name] = callback.mock.calls[0];
      expect(error).toBeDefined();
      expect(name).toBeUndefined();
    });

    it('should return the filename', () => {
      filename(mock.userRequest, mock.file, callback);

      expect(mkdirSync).not.toHaveBeenCalled();
      expect(callback).toHaveBeenCalledWith(null, 'test-user.jpg');
    });

    it('should sanitize the filename', () => {
      filename(mock.userRequest, { ...mock.file, originalname: 'test.j\u0000pg' }, callback);
      expect(callback).toHaveBeenCalledWith(null, 'test-user.jpg');
    });
  });
});