/* eslint-env jest */
import { headingsKey, readHeadings, type EditorBlock } from '../headings';

const block = (
  name: string,
  attributes: Record<string, unknown>,
  innerBlocks: EditorBlock[] = []
): EditorBlock => ({ name, attributes, innerBlocks });

describe('the headings of the table of contents', () => {
  const blocks = [
    block('core/heading', { content: 'Why <em>cotton</em>', level: 2 }),
    block('core/paragraph', { content: 'Soft.' }),
    block('core/group', {}, [
      block('core/heading', { content: 'Care', level: 3 }),
      block('core/heading', { content: 'Deep', level: 4 }),
    ]),
    block('core/heading', { content: ' ', level: 2 }),
  ];

  it('gives the same key for the same headings, whatever else changed', () => {
    const edited = [
      ...blocks.slice(0, 1),
      block('core/paragraph', { content: 'Soft and warm.' }),
      ...blocks.slice(2),
    ];
    expect(headingsKey(edited)).toBe(headingsKey(blocks));
    expect(
      headingsKey([block('core/heading', { content: 'New', level: 2 })])
    ).not.toBe(headingsKey(blocks));
  });

  it('reads the headings back down to the deepest level asked', () => {
    expect(readHeadings(headingsKey(blocks), 3)).toEqual([
      { text: 'Why cotton', level: 2 },
      { text: 'Care', level: 3 },
    ]);
  });
});