jest.mock('child_process', () => ({
  execFileSync: jest.fn(),
}));

jest.mock('fs', () => ({
  readFileSync: jest.fn(),
  mkdtempSync: jest.fn(),
  readdirSync: jest.fn(),
  rmSync: jest.fn(),
  renameSync: jest.fn(),
}));

jest.mock('os', () => ({
  tmpdir: () => '/tmp',
}));

jest.mock('path', () => ({
  join: (...parts: string[]) => parts.join('/'),
}));

import { execFileSync } from 'child_process';
import fs from 'fs';
import { createLocalPackageTarball } from '../../src/scripts/local-pack';

describe('createLocalPackageTarball', () => {
  it('creates tarball and renames it', async () => {
    const readFileSync = fs.readFileSync as jest.Mock;
    readFileSync.mockReturnValueOnce(JSON.stringify({ version: '1.0.0' }));
    (fs.mkdtempSync as jest.Mock).mockReturnValueOnce('/tmp/pack');
    (fs.readdirSync as jest.Mock).mockReturnValueOnce(['pkg.tgz']);

    const result = await createLocalPackageTarball({
      projectRoot: '/repo',
      outputDir: '/out',
      packageName: 'test-package',
    });

    expect(execFileSync).toHaveBeenCalledWith(
      'npm',
      ['pack', '--silent', '--pack-destination', '/tmp/pack'],
      expect.objectContaining({ cwd: '/repo', stdio: 'pipe' }),
    );
    expect(fs.renameSync).toHaveBeenCalledWith(
      '/tmp/pack/pkg.tgz',
      '/out/test-package-v1.0.0.tgz',
    );
    expect(fs.rmSync).toHaveBeenCalledWith('/tmp/pack', {
      recursive: true,
      force: true,
    });
    expect(result).toBe('/out/test-package-v1.0.0.tgz');
  });

  it('throws when version missing', async () => {
    const readFileSync = fs.readFileSync as jest.Mock;
    readFileSync.mockReturnValueOnce(JSON.stringify({}));

    await expect(
      createLocalPackageTarball({ projectRoot: '/repo' }),
    ).rejects.toThrow('Unable to determine package version from package.json.');
  });

  it('throws when pack outputs multiple files', async () => {
    const readFileSync = fs.readFileSync as jest.Mock;
    readFileSync.mockReturnValueOnce(JSON.stringify({ version: '1.0.0' }));
    (fs.mkdtempSync as jest.Mock).mockReturnValueOnce('/tmp/pack');
    (fs.readdirSync as jest.Mock).mockReturnValueOnce(['a.tgz', 'b.tgz']);

    await expect(
      createLocalPackageTarball({ projectRoot: '/repo' }),
    ).rejects.toThrow(
      'Unexpected npm pack output. Expected a single .tgz file.',
    );

    expect(fs.rmSync).toHaveBeenCalledWith('/tmp/pack', {
      recursive: true,
      force: true,
    });
  });
});