import { GlIcon } from '@gitlab/ui';
import { shallowMount } from '@vue/test-utils';
import { extendedWrapper } from 'helpers/vue_test_utils_helper';

import DiffStats from '~/diffs/components/diff_stats.vue';
import { getDiffFileMock } from '../mock_data/diff_file';

const TEST_ADDED_LINES = 100;
const TEST_REMOVED_LINES = 200;
const DIFF_FILES_COUNT = '300';
const DIFF_FILES_COUNT_TRUNCATED = '300+';

describe('diff_stats', () => {
  let wrapper;

  const createComponent = (props = {}) => {
    wrapper = extendedWrapper(
      shallowMount(DiffStats, {
        propsData: {
          addedLines: TEST_ADDED_LINES,
          removedLines: TEST_REMOVED_LINES,
          ...props,
        },
      }),
    );
  };

  describe('diff stats group', () => {
    const findDiffStatsGroup = () => wrapper.findAll('.diff-stats-group');

    it('is not rendered if diffFilesCountText is empty', () => {
      createComponent();

      expect(findDiffStatsGroup().length).toBe(2);
    });

    it('is not rendered if diffFilesCountText is not a number', () => {
      createComponent({
        diffFilesCountText: null,
      });

      expect(findDiffStatsGroup().length).toBe(2);
    });
  });

  describe('bytes changes', () => {
    let file;
    const getBytesContainer = () => wrapper.find('.diff-stats > div:first-child');

    beforeEach(() => {
      const mockDiffFile = getDiffFileMock();
      file = {
        ...mockDiffFile,
        viewer: {
          ...mockDiffFile.viewer,
          name: 'not_diffable',
        },
      };

      createComponent({ diffFile: file });
    });

    it("renders the bytes changes instead of line changes when the file isn't diffable", () => {
      const content = getBytesContainer();

      expect(content.classes('gl-text-green-600')).toBe(true);
      expect(content.text()).toBe('+1.00 KiB (+100%)');
    });
  });

  describe('line changes', () => {
    const findFileLine = (name) => wrapper.findByTestId(name);

    beforeEach(() => {
      createComponent();
    });

    it('shows the amount of lines added', () => {
      expect(findFileLine('js-file-addition-line').text()).toBe(TEST_ADDED_LINES.toString());
    });

    it('shows the amount of lines removed', () => {
      expect(findFileLine('js-file-deletion-line').text()).toBe(TEST_REMOVED_LINES.toString());
    });
  });

  describe('files changes', () => {
    const findIcon = (name) =>
      wrapper
        .findAll(GlIcon)
        .filter((c) => c.attributes('name') === name)
        .at(0).element.parentNode;

    it('shows amount of file changed with plural "files" when 0 files has changed', () => {
      const oneFileChanged = '0';

      createComponent({
        diffFilesCountText: oneFileChanged,
      });

      expect(findIcon('doc-code').textContent.trim()).toBe(`${oneFileChanged} files`);
    });

    it('shows amount of file changed with singular "file" when 1 file is changed', () => {
      const oneFileChanged = '1';

      createComponent({
        diffFilesCountText: oneFileChanged,
      });

      expect(findIcon('doc-code').textContent.trim()).toBe(`${oneFileChanged} file`);
    });

    it('shows amount of files change with plural "files" when multiple files are changed', () => {
      createComponent({
        diffFilesCountText: DIFF_FILES_COUNT,
      });

      expect(findIcon('doc-code').textContent.trim()).toContain(`${DIFF_FILES_COUNT} files`);
    });

    it('shows amount of files change with plural "files" when files changed is truncated', () => {
      createComponent({
        diffFilesCountText: DIFF_FILES_COUNT_TRUNCATED,
      });

      expect(findIcon('doc-code').textContent.trim()).toContain(
        `${DIFF_FILES_COUNT_TRUNCATED} files`,
      );
    });
  });
});