import MockAdapter from 'axios-mock-adapter';
import axios from '~/lib/utils/axios_utils';
import renderNotebook from '~/blob/notebook';

describe('iPython notebook renderer', () => {
  preloadFixtures('static/notebook_viewer.html');

  beforeEach(() => {
    loadFixtures('static/notebook_viewer.html');
  });

  it('shows loading icon', () => {
    renderNotebook();

    expect(document.querySelector('.loading')).not.toBeNull();
  });

  describe('successful response', () => {
    let mock;

    beforeEach(done => {
      mock = new MockAdapter(axios);
      mock.onGet('/test').reply(200, {
        cells: [
          {
            cell_type: 'markdown',
            source: ['# test'],
          },
          {
            cell_type: 'code',
            execution_count: 1,
            source: ['def test(str)', '  return str'],
            outputs: [],
          },
        ],
      });

      renderNotebook();

      setTimeout(() => {
        done();
      });
    });

    afterEach(() => {
      mock.restore();
    });

    it('does not show loading icon', () => {
      expect(document.querySelector('.loading')).toBeNull();
    });

    it('renders the notebook', () => {
      expect(document.querySelector('.md')).not.toBeNull();
    });

    it('renders the markdown cell', () => {
      expect(document.querySelector('h1')).not.toBeNull();

      expect(document.querySelector('h1').textContent.trim()).toBe('test');
    });

    it('highlights code', () => {
      expect(document.querySelector('.token')).not.toBeNull();

      expect(document.querySelector('.language-python')).not.toBeNull();
    });
  });

  describe('error in JSON response', () => {
    let mock;

    beforeEach(done => {
      mock = new MockAdapter(axios);
      mock.onGet('/test').reply(() =>
        // eslint-disable-next-line prefer-promise-reject-errors
        Promise.reject({ status: 200, data: '{ "cells": [{"cell_type": "markdown"} }' }),
      );

      renderNotebook();

      setTimeout(() => {
        done();
      });
    });

    afterEach(() => {
      mock.restore();
    });

    it('does not show loading icon', () => {
      expect(document.querySelector('.loading')).toBeNull();
    });

    it('shows error message', () => {
      expect(document.querySelector('.md').textContent.trim()).toBe(
        'An error occurred whilst parsing the file.',
      );
    });
  });

  describe('error getting file', () => {
    let mock;

    beforeEach(done => {
      mock = new MockAdapter(axios);
      mock.onGet('/test').reply(500, '');

      renderNotebook();

      setTimeout(() => {
        done();
      });
    });

    afterEach(() => {
      mock.restore();
    });

    it('does not show loading icon', () => {
      expect(document.querySelector('.loading')).toBeNull();
    });

    it('shows error message', () => {
      expect(document.querySelector('.md').textContent.trim()).toBe(
        'An error occurred whilst loading the file. Please try again later.',
      );
    });
  });
});