import { describe, it, expect } from 'vitest';
import { groupCategoriesByFirstLetter } from '../group-categories-by-first-letter';

const items = [
  { title: 'Amateur', name: 'amateur', videosCount: 10, guid: '1', icon: '', is_top: false },
  { title: 'Anal', name: 'anal', videosCount: 5, guid: '2', icon: '', is_top: true },
  { title: 'Big Tits', name: 'big-tits', videosCount: 20, guid: '3', icon: '', is_top: false },
  { title: '69', name: '69', videosCount: 8, guid: '4', icon: '', is_top: false },
];

describe('groupCategoriesByFirstLetter', () => {
  it('группирует по первой букве title', () => {
    const result = groupCategoriesByFirstLetter(items as any, 'title', 'en');
    expect(Object.keys(result)).toContain('A');
    expect(Object.keys(result)).toContain('B');
    expect(result['A']).toHaveLength(2);
    expect(result['B']).toHaveLength(1);
  });

  it('цифры попадают в POST', () => {
    const result = groupCategoriesByFirstLetter(items as any, 'title', 'en');
    expect(result['POST']).toHaveLength(1);
    expect(result['POST'][0].name).toBe('69');
  });

  it('кастомный nonLetterKey', () => {
    const result = groupCategoriesByFirstLetter(items as any, 'title', 'en', 'OTHER');
    expect(result['OTHER']).toHaveLength(1);
  });

  it('POST ключ идёт последним', () => {
    const result = groupCategoriesByFirstLetter(items as any, 'title', 'en');
    const keys = Object.keys(result);
    expect(keys[keys.length - 1]).toBe('POST');
  });

  it('пустой массив', () => {
    const result = groupCategoriesByFirstLetter([], 'title', 'en');
    expect(result).toEqual({});
  });

  it('не массив → пустой результат', () => {
    const result = groupCategoriesByFirstLetter(null as any, 'title', 'en');
    expect(result).toEqual({});
  });
});