import PasteMarkdown from '~/content_editor/extensions/paste_markdown';
import CodeBlockHighlight from '~/content_editor/extensions/code_block_highlight';
import Diagram from '~/content_editor/extensions/diagram';
import Frontmatter from '~/content_editor/extensions/frontmatter';
import Bold from '~/content_editor/extensions/bold';
import { VARIANT_DANGER } from '~/alert';
import eventHubFactory from '~/helpers/event_hub_factory';
import { ALERT_EVENT } from '~/content_editor/constants';
import waitForPromises from 'helpers/wait_for_promises';
import { createTestEditor, createDocBuilder, waitUntilNextDocTransaction } from '../test_utils';

const CODE_BLOCK_HTML = '<pre class="js-syntax-highlight" lang="javascript">var a = 2;</pre>';
const DIAGRAM_HTML =
  '<img data-diagram="nomnoml" data-diagram-src="data:text/plain;base64,WzxmcmFtZT5EZWNvcmF0b3IgcGF0dGVybl0=">';
const FRONTMATTER_HTML = '<pre lang="yaml" data-lang-params="frontmatter">key: value</pre>';
const PARAGRAPH_HTML = '<p>Just a regular paragraph</p>';

describe('content_editor/extensions/paste_markdown', () => {
  let tiptapEditor;
  let doc;
  let p;
  let bold;
  let renderMarkdown;
  let eventHub;
  const defaultData = { 'text/plain': '**bold text**' };

  beforeEach(() => {
    renderMarkdown = jest.fn();
    eventHub = eventHubFactory();

    jest.spyOn(eventHub, '$emit');

    tiptapEditor = createTestEditor({
      extensions: [
        Bold,
        CodeBlockHighlight,
        Diagram,
        Frontmatter,
        PasteMarkdown.configure({ renderMarkdown, eventHub }),
      ],
    });

    ({
      builders: { doc, p, bold },
    } = createDocBuilder({
      tiptapEditor,
      names: {
        bold: { markType: Bold.name },
      },
    }));
  });

  const buildClipboardEvent = ({ data = {}, types = ['text/plain'] } = {}) => {
    return Object.assign(new Event('paste'), {
      clipboardData: { types, getData: jest.fn((type) => data[type] || defaultData[type]) },
    });
  };

  const triggerPasteEventHandler = (event) => {
    return new Promise((resolve) => {
      tiptapEditor.view.someProp('handlePaste', (eventHandler) => {
        resolve(eventHandler(tiptapEditor.view, event));
      });
    });
  };

  const triggerPasteEventHandlerAndWaitForTransaction = (event) => {
    return waitUntilNextDocTransaction({
      tiptapEditor,
      action: () => {
        tiptapEditor.view.someProp('handlePaste', (eventHandler) => {
          return eventHandler(tiptapEditor.view, event);
        });
      },
    });
  };

  it.each`
    types                                                | data                                                  | handled  | desc
    ${['text/plain']}                                    | ${{}}                                                 | ${true}  | ${'handles plain text'}
    ${['text/plain', 'text/html']}                       | ${{}}                                                 | ${false} | ${'doesn’t handle html format'}
    ${['text/plain', 'text/html', 'vscode-editor-data']} | ${{ 'vscode-editor-data': '{ "mode": "markdown" }' }} | ${true}  | ${'handles vscode markdown'}
    ${['text/plain', 'text/html', 'vscode-editor-data']} | ${{ 'vscode-editor-data': '{ "mode": "ruby" }' }}     | ${false} | ${'doesn’t vscode code snippet'}
  `('$desc', async ({ types, handled, data }) => {
    expect(await triggerPasteEventHandler(buildClipboardEvent({ types, data }))).toBe(handled);
  });

  it.each`
    nodeType         | html                | handled  | desc
    ${'codeBlock'}   | ${CODE_BLOCK_HTML}  | ${false} | ${'does not handle'}
    ${'diagram'}     | ${DIAGRAM_HTML}     | ${false} | ${'does not handle'}
    ${'frontmatter'} | ${FRONTMATTER_HTML} | ${false} | ${'does not handle'}
    ${'paragraph'}   | ${PARAGRAPH_HTML}   | ${true}  | ${'handles'}
  `('$desc paste if currently a `$nodeType` is in focus', async ({ html, handled }) => {
    tiptapEditor.commands.insertContent(html);

    expect(await triggerPasteEventHandler(buildClipboardEvent())).toBe(handled);
  });

  describe('when pasting raw markdown source', () => {
    describe('when rendering markdown succeeds', () => {
      beforeEach(() => {
        renderMarkdown.mockResolvedValueOnce('<strong>bold text</strong>');
      });

      it('transforms pasted text into a prosemirror node', async () => {
        const expectedDoc = doc(p(bold('bold text')));

        await triggerPasteEventHandlerAndWaitForTransaction(buildClipboardEvent());

        expect(tiptapEditor.state.doc.toJSON()).toEqual(expectedDoc.toJSON());
      });
    });

    describe('when rendering markdown fails', () => {
      beforeEach(() => {
        renderMarkdown.mockRejectedValueOnce();
      });

      it(`triggers ${ALERT_EVENT} event`, async () => {
        await triggerPasteEventHandler(buildClipboardEvent());
        await waitForPromises();

        expect(eventHub.$emit).toHaveBeenCalledWith(ALERT_EVENT, {
          message: expect.any(String),
          variant: VARIANT_DANGER,
        });
      });
    });
  });
});