import { describe, test, expect } from 'vitest';
import { buildSlugIndex, resolveTarget, type FileRef } from '../src/resolver.js';

const refs: FileRef[] = [
  { slug: 'clock-modulation', dir: 'concepts' },
  { slug: 'euclidean-rhythms', dir: 'concepts' },
  { slug: 'clock', dir: 'concepts' },
  { slug: 'clock', dir: 'entities' },
];

describe('resolveTarget', () => {
  const index = buildSlugIndex(refs);

  test('resolves an exact slug to its node id', () => {
    expect(resolveTarget('euclidean-rhythms', 'concepts', index)).toEqual({
      node: 'euclidean-rhythms',
      collision: false,
    });
  });

  test('matches case-insensitively, normalizing node id to lowercase', () => {
    expect(resolveTarget('Clock-Modulation', 'concepts', index)).toEqual({
      node: 'clock-modulation',
      collision: false,
    });
  });

  test('returns null for an unresolved (dangling) target', () => {
    expect(resolveTarget('<todo-module>', 'concepts', index)).toBeNull();
    expect(resolveTarget('does-not-exist', 'concepts', index)).toBeNull();
  });

  test('on basename collision prefers same-dir and flags collision', () => {
    expect(resolveTarget('clock', 'entities', index)).toEqual({
      node: 'clock',
      collision: true,
    });
  });

  test('on collision with no same-dir match still resolves and flags collision', () => {
    expect(resolveTarget('clock', 'packages', index)).toEqual({
      node: 'clock',
      collision: true,
    });
  });
});