const { test } = require('node:test');
const assert = require('node:assert/strict');
const { spawnSync } = require('node:child_process');
const fs = require('node:fs');
const os = require('node:os');
const path = require('node:path');

const ROOT = path.join(__dirname, '..');
const SCRIPT = path.join(ROOT, 'scripts', 'changelog-section.sh');

function extract(version, changelog = path.join(ROOT, 'CHANGELOG.md')) {
  return spawnSync('bash', [SCRIPT, version, changelog], { encoding: 'utf8' });
}

function withChangelog(contents, assertion) {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'stoke-changelog-test-'));
  try {
    const changelog = path.join(dir, 'CHANGELOG.md');
    fs.writeFileSync(changelog, contents);
    assertion(changelog);
  } finally {
    fs.rmSync(dir, { recursive: true, force: true });
  }
}

test('extracts the complete real 1.4.0 changelog section', () => {
  const result = extract('1.4.0');

  assert.equal(result.status, 0, result.stderr);
  assert.equal(result.stderr, '');
  assert.equal(result.stdout.split('\n').length - 1, 21);
  assert.match(result.stdout, /^### Added$/m);
  assert.match(result.stdout, /^### Changed$/m);
  assert.match(result.stdout, /^### Fixed$/m);
});

test('missing version fails with a reason and no stdout', () => {
  const result = extract('0.0.0');

  assert.equal(result.status, 1);
  assert.equal(result.stdout, '');
  assert.match(result.stderr, /no section for '0\.0\.0'/);
});

test('heading without a list entry is rejected as empty', () => {
  withChangelog('## 2.0.0\n\n### Changed\n\nProse only.\n', (changelog) => {
    const result = extract('2.0.0', changelog);

    assert.equal(result.status, 1);
    assert.equal(result.stdout, '');
    assert.match(result.stderr, /section '2\.0\.0' has no entries/);
  });
});

test('extraction stops before the next version heading', () => {
  withChangelog([
    '## 2.0.0',
    '',
    '### Added',
    '',
    '- Current change.',
    '',
    '## 1.0.0',
    '',
    '### Added',
    '',
    '- Older change.',
    '',
  ].join('\n'), (changelog) => {
    const result = extract('2.0.0', changelog);

    assert.equal(result.status, 0, result.stderr);
    assert.equal(result.stdout, '### Added\n\n- Current change.\n');
    assert.doesNotMatch(result.stdout, /Older change/);
  });
});