import { renderMarkdownToHtml } from '../../frontend/src/app/core/services/markdown.pure';

describe('renderMarkdownToHtml', () => {
  it('renders headings', () => {
    expect(renderMarkdownToHtml('# Hello')).toContain('<h1>Hello</h1>');
  });

  it('renders bold and italic', () => {
    const out = renderMarkdownToHtml('**bold** and *italic*');
    expect(out).toContain('<strong>bold</strong>');
    expect(out).toContain('<em>italic</em>');
  });

  it('renders safe links', () => {
    expect(renderMarkdownToHtml('[a](https://example.com)')).toContain('href="https://example.com"');
  });

  it('strips <script> tags', () => {
    const out = renderMarkdownToHtml('<script>alert(1)</script>safe');
    expect(out).not.toContain('<script>');
    expect(out).toContain('safe');
  });

  it('strips javascript: hrefs', () => {
    const out = renderMarkdownToHtml('[click](javascript:alert(1))');
    expect(out).not.toMatch(/href="javascript:/i);
  });

  it('handles empty/null/undefined input', () => {
    expect(renderMarkdownToHtml('')).toBeDefined();
    expect(renderMarkdownToHtml(null as unknown as string)).toBeDefined();
    expect(renderMarkdownToHtml(undefined as unknown as string)).toBeDefined();
  });
});