import { describe, expect, test } from 'vitest';
import { render, screen } from '@testing-library/svelte';
import { createRawSnippet } from 'svelte';
import AlphabeticalGrid from './AlphabeticalGrid.svelte';

type Item = { id: string; key: string; label: string };

const items: Item[] = [
  { id: '1', key: 'A', label: 'Apple' },
  { id: '2', key: 'A', label: 'Avocado' },
  { id: '3', key: 'B', label: 'Banana' },
  { id: '4', key: 'D', label: 'Date' }   // skips C — divider must jump to D directly
];

// createRawSnippet<Params> receives getters: each param is () => ParamType
const itemSnippet = createRawSnippet<[Item]>((getIt) => ({
  render: () => `<span>${getIt().label}</span>`
}));

// The generic component's T parameter can't be inferred by testing-library's render,
// so we cast props to avoid a spurious unknown-assignability error.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
type AnyProps = any;

describe('AlphabeticalGrid', () => {
  test('inserts a divider for each new key letter', () => {
    render(AlphabeticalGrid, {
      props: {
        items,
        getKey: (it: Item) => it.key,
        item: itemSnippet
      } as AnyProps
    });
    // Three dividers (A, B, D); C is absent because no items use C.
    expect(screen.getByText('A')).toBeInTheDocument();
    expect(screen.getByText('B')).toBeInTheDocument();
    expect(screen.getByText('D')).toBeInTheDocument();
    expect(screen.queryByText('C')).not.toBeInTheDocument();
  });

  test('renders items in given order', () => {
    const { container } = render(AlphabeticalGrid, {
      props: {
        items,
        getKey: (it: Item) => it.key,
        item: itemSnippet
      } as AnyProps
    });
    expect(container.textContent).toMatch(/A.*Apple.*Avocado.*B.*Banana.*D.*Date/s);
  });
});
