import { describe, test, expect } from 'vitest';
import { extractLinks } from '../src/parser.js';

describe('extractLinks', () => {
  test('extracts a simple [[slug]] link', () => {
    const links = extractLinks('see [[clock-modulation]] for details');
    expect(links).toEqual([{ target: 'clock-modulation', alias: null }]);
  });

  test('takes left part of [[slug|alias]]', () => {
    const links = extractLinks('[[euclidean-rhythms|Euclidean Rhythms]]');
    expect(links).toEqual([
      { target: 'euclidean-rhythms', alias: 'Euclidean Rhythms' },
    ]);
  });

  test('extracts multiple links across the document', () => {
    const links = extractLinks('[[a]] then\nsome text [[b|B]] and [[c]]');
    expect(links).toEqual([
      { target: 'a', alias: null },
      { target: 'b', alias: 'B' },
      { target: 'c', alias: null },
    ]);
  });

  test('keeps placeholder targets verbatim (resolver decides dangling)', () => {
    const links = extractLinks('TODO link [[<module-name>]]');
    expect(links).toEqual([{ target: '<module-name>', alias: null }]);
  });

  test('returns empty for content with no wikilinks', () => {
    expect(extractLinks('plain text, a [single] bracket, no links')).toEqual([]);
  });
});