import assert from 'node:assert/strict';
import { execFileSync, spawnSync } from 'node:child_process';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import test from 'node:test';

const script = path.resolve('runtime/checkout-active-release.sh');
const roots = [];
const git = (cwd, ...args) =>
  execFileSync('git', args, {
    cwd,
    encoding: 'utf8',
    env: {
      ...process.env,
      GIT_AUTHOR_NAME: 'Sammo Test',
      GIT_AUTHOR_EMAIL: 'sammo-test@example.invalid',
      GIT_COMMITTER_NAME: 'Sammo Test',
      GIT_COMMITTER_EMAIL: 'sammo-test@example.invalid',
    },
  }).trim();

const fixture = () => {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'sammo-active-release-'));
  roots.push(root);
  git(root, 'init', '-b', 'main');
  fs.writeFileSync(path.join(root, 'version.txt'), 'one\n');
  git(root, 'add', 'version.txt');
  git(root, 'commit', '-m', 'first');
  const first = git(root, 'rev-parse', 'HEAD');
  fs.writeFileSync(path.join(root, 'version.txt'), 'two\n');
  git(root, 'commit', '-am', 'second');
  const second = git(root, 'rev-parse', 'HEAD');
  git(root, 'update-ref', 'refs/sammo/active-gateway', first);
  return { root, first, second };
};

test.afterEach(() => {
  for (const root of roots.splice(0)) fs.rmSync(root, { recursive: true, force: true });
});

test('checks out the persistent active release instead of the previous bootstrap HEAD', () => {
  const { root, first, second } = fixture();
  assert.equal(git(root, 'rev-parse', 'HEAD'), second);
  execFileSync('/bin/sh', [script, root, 'refs/sammo/active-gateway']);
  assert.equal(git(root, 'rev-parse', 'HEAD'), first);
});

test('rejects refs outside the managed release namespace', () => {
  const { root } = fixture();
  const result = spawnSync('/bin/sh', [script, root, 'refs/heads/main'], { encoding: 'utf8' });
  assert.equal(result.status, 64);
  assert.match(result.stderr, /refs\/sammo/u);
});

test('refuses to hide tracked bootstrap checkout changes', () => {
  const { root, second } = fixture();
  fs.writeFileSync(path.join(root, 'version.txt'), 'dirty\n');
  const result = spawnSync('/bin/sh', [script, root, 'refs/sammo/active-gateway'], { encoding: 'utf8' });
  assert.equal(result.status, 65);
  assert.equal(git(root, 'rev-parse', 'HEAD'), second);
});