/**
 * Changesets integration tests — covers the pure helpers in
 * changesets.ts. The impure pieces (running `bunx changeset version`,
 * doing git commits) are thin wrappers around well-tested external
 * tools; we don't unit-test those.
 */

import { describe, expect, test } from 'bun:test';
import { filterChangesetEntries, parseGitStatusFiles } from './changesets';

describe('filterChangesetEntries', () => {
  test('returns nothing for an empty dir', () => {
    expect(filterChangesetEntries([])).toEqual([]);
  });

  test('returns only .md files', () => {
    expect(
      filterChangesetEntries([
        'fancy-tigers-jump.md',
        'config.json',
        '.DS_Store',
        'noisy-cats-walk.md',
      ]),
    ).toEqual(['fancy-tigers-jump.md', 'noisy-cats-walk.md']);
  });

  test('excludes README.md (the default scaffolding doc)', () => {
    expect(filterChangesetEntries(['README.md', 'happy-birds-sing.md'])).toEqual([
      'happy-birds-sing.md',
    ]);
  });

  test('excludes config.json regardless of extension filtering', () => {
    // config.json doesn't end in .md so it's already excluded by the
    // extension filter; this test documents that the extension check
    // alone is sufficient — no special-case needed for config.json.
    expect(filterChangesetEntries(['config.json'])).toEqual([]);
  });

  test('preserves input order (changesets has no inherent ordering)', () => {
    expect(filterChangesetEntries(['z-z-z.md', 'a-a-a.md', 'm-m-m.md'])).toEqual([
      'z-z-z.md',
      'a-a-a.md',
      'm-m-m.md',
    ]);
  });
});

describe('parseGitStatusFiles', () => {
  test('returns empty for empty input', () => {
    expect(parseGitStatusFiles('')).toEqual([]);
    expect(parseGitStatusFiles('\n\n')).toEqual([]);
  });

  test('parses modified and untracked entries (XY-space-path format)', () => {
    const output = [
      ' M packages/cli-display/package.json',
      ' M packages/event-bus/package.json',
      'A  packages/cli-display/CHANGELOG.md',
      '?? .changeset/quick-flowers-jump.md',
    ].join('\n');

    expect(parseGitStatusFiles(output)).toEqual([
      'packages/cli-display/package.json',
      'packages/event-bus/package.json',
      'packages/cli-display/CHANGELOG.md',
      '.changeset/quick-flowers-jump.md',
    ]);
  });

  test('handles deletions (changeset version removes consumed changesets)', () => {
    const output = [' D .changeset/old-bumpy-cats.md', 'D  .changeset/consumed.md'].join('\n');

    expect(parseGitStatusFiles(output)).toEqual([
      '.changeset/old-bumpy-cats.md',
      '.changeset/consumed.md',
    ]);
  });

  test('handles renames (uses destination path)', () => {
    const output = 'R  old/path.md -> new/path.md';
    expect(parseGitStatusFiles(output)).toEqual(['new/path.md']);
  });

  test('ignores blank lines', () => {
    const output = [' M foo.txt', '', '  ', ' M bar.txt'].join('\n');
    expect(parseGitStatusFiles(output)).toEqual(['foo.txt', 'bar.txt']);
  });
});