import { render, screen, fireEvent, act } from '@testing-library/react';
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { Mecanismo } from '../Mecanismo';

describe('<Mecanismo />', () => {
  it('renders the 3 steps in order', () => {
    render(<Mecanismo />);
    expect(screen.getByText('Inmersión')).toBeInTheDocument();
    expect(screen.getByText('Desafiar supuestos')).toBeInTheDocument();
    expect(screen.getByText('Estrategia ejecutable')).toBeInTheDocument();
  });
  it('renders step numbers 01/02/03', () => {
    const { container } = render(<Mecanismo />);
    expect(container.textContent).toMatch(/01.+02.+03/);
  });
  it('keeps the background photo subtle enough not to fight the text', () => {
    const { container } = render(<Mecanismo />);
    const bg = container.querySelector('img');
    expect(bg).toHaveAttribute('src', '/images/mecanismo-bg.jpg');
    expect(bg?.closest('[class*="opacity-"]')).not.toBeNull();
  });

  describe('auto-advancing step indicator', () => {
    beforeEach(() => { vi.useFakeTimers(); });
    afterEach(() => { vi.useRealTimers(); });

    it('highlights the first step by default, then advances on its own', () => {
      render(<Mecanismo />);
      const tabs = screen.getAllByRole('tab');
      expect(tabs[0]).toHaveAttribute('aria-selected', 'true');
      act(() => { vi.advanceTimersByTime(3300); });
      expect(tabs[1]).toHaveAttribute('aria-selected', 'true');
    });

    it('stops advancing while the pointer is over the steps', () => {
      render(<Mecanismo />);
      const tabs = screen.getAllByRole('tab');
      fireEvent.mouseEnter(screen.getByRole('tablist'));
      act(() => { vi.advanceTimersByTime(6000); });
      expect(tabs[0]).toHaveAttribute('aria-selected', 'true');
    });
  });
});