import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { render, screen, waitFor } from '@testing-library/svelte';
import Presentomatic from './Presentomatic.svelte';

const mockMarkdown = `# Slide 1
First slide content

---

## Slide 2
Second slide content

---

### Slide 3
Third slide content`;

describe('Presentomatic', () => {
  beforeEach(() => {
    vi.stubGlobal(
      'fetch',
      vi.fn(() =>
        Promise.resolve({
          text: () => Promise.resolve(mockMarkdown)
        })
      )
    );

    // Reset location
    window.location.hash = '';
    Object.defineProperty(window, 'location', {
      value: {
        ...window.location,
        search: '',
        hash: ''
      },
      writable: true
    });
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('renders the component', async () => {
    render(Presentomatic);

    await waitFor(() => {
      expect(screen.getByRole('main')).toBeInTheDocument();
    });
  });

  it('loads and displays the first slide on mount', async () => {
    render(Presentomatic);

    await waitFor(() => {
      expect(screen.getByText('First slide content')).toBeInTheDocument();
    });
  });

  it('fetches the markdown file on mount', async () => {
    render(Presentomatic);

    await waitFor(() => {
      expect(fetch).toHaveBeenCalledWith('test.md');
    });
  });

  it('parses markdown into slides', async () => {
    render(Presentomatic);

    await waitFor(() => {
      // First slide should be displayed
      expect(screen.getByText('First slide content')).toBeInTheDocument();
    });
  });

  it('applies title-slide class for slides with h1', async () => {
    render(Presentomatic);

    await waitFor(() => {
      const main = screen.getByRole('main');
      expect(main.querySelector('.slide')).toHaveClass('title-slide');
    });
  });

  it('navigates to requested page from URL hash', async () => {
    Object.defineProperty(window, 'location', {
      value: {
        ...window.location,
        search: '',
        hash: '#2'
      },
      writable: true
    });

    render(Presentomatic);

    await waitFor(() => {
      expect(screen.getByText('Second slide content')).toBeInTheDocument();
    });
  });
});