import React from 'react';
import { describe, it, expect, afterEach } from 'vitest';
import { render, fireEvent } from '@testing-library/react';
import { OutlinerBlock, mapRenderedOffsetToRaw } from '../OutlinerBlock';
import { DocumentBlock } from '../../../lib/types';

describe('mapRenderedOffsetToRaw', () => {
  it('is the identity for plain text', () => {
    expect(mapRenderedOffsetToRaw('Hallo Welt', 'Hallo Welt', 4)).toBe(4);
  });
  it('skips bold markers', () => {
    expect(mapRenderedOffsetToRaw('Hallo **Welt** du', 'Hallo Welt du', 8)).toBe(10);
  });
  it('maps behind closing markers', () => {
    expect(mapRenderedOffsetToRaw('a **b** c', 'a b c', 4)).toBe(8);
  });
  it('maps into a link label', () => {
    expect(mapRenderedOffsetToRaw('x [Seite](https://a.de) y', 'x Seite y', 4)).toBe(5);
  });
  it('handles the empty placeholder', () => {
    expect(mapRenderedOffsetToRaw('', '​', 1)).toBe(0);
  });
});

describe('clicking into an unfocused bullet', () => {
  afterEach(() => {
    delete (document as any).caretRangeFromPoint;
  });

  it('places the caret at the click position instead of the end', () => {
    const block = { id: 'b1', type: 'bullet', content: 'Hallo **Welt** du', level: 0, position: 1 } as DocumentBlock;
    const { container } = render(
      <OutlinerBlock
        docId="d"
        block={block}
        index={0}
        isLast
        maxAllowedLevel={1}
        hasChildren={false}
        isFocused={false}
        canEdit
        onUpdateBlock={() => {}}
        onCreateBlockBelow={() => {}}
        onDeleteBlock={() => {}}
        onIndentBlock={() => {}}
        onNavigateFocus={() => {}}
        registerTextareaRef={() => {}}
      />
    );
    const ta = container.querySelector('textarea') as HTMLTextAreaElement;
    const strong = container.querySelector('strong') as HTMLElement; // rendered "Welt"
    // jsdom has no layout: pretend the click hit between "We" and "lt"
    (document as any).caretRangeFromPoint = () => {
      const r = document.createRange();
      r.setStart(strong.firstChild!, 2);
      return r;
    };

    fireEvent.click(strong);

    expect(document.activeElement).toBe(ta);
    expect(ta.selectionStart).toBe(10); // "Hallo **We|lt** du"
  });
});