// @vitest-environment jsdom
import { render, act } from '@testing-library/react';
import { LanguageProvider, useTranslation } from '../index';
import { describe, it, expect } from 'vitest';

describe('LanguageProvider Initial Render', () => {
  it('should verify initial render count', async () => {
    let renderCount = 0;

    const Consumer = () => {
      useTranslation();
      renderCount++;
      return null;
    };

    render(
      <LanguageProvider>
        <Consumer />
      </LanguageProvider>
    );

    // Wait for any effects to run
    await act(async () => {
      await new Promise(resolve => setTimeout(resolve, 10));
    });

    // After optimization, renderCount should be 1.
    // Previously it was 2.
    expect(renderCount).toBe(1);

    // Verify lang attribute is set (getInitialLanguage defaults to 'de' in jsdom if window undefined,
    // but in jsdom window IS defined. navigator.language usually defaults to en-US in jsdom)
    // We just check it's set to something valid ('en' or 'de')
    expect(['en', 'de']).toContain(document.documentElement.lang);
  });
});