import { describe, expect, test } from 'bun:test';
import { performSelfUpdate } from './self-update';

const okUpdater = async () => ({ ok: true, stderr: '' });
const failUpdater = async () => ({ ok: false, stderr: 'EACCES on /usr/local' });

describe('performSelfUpdate', () => {
  test('skips when devMode flag is set', async () => {
    const result = await performSelfUpdate({
      installedVersion: '0.0.1',
      fetcher: async () => '99.0.0',
      updater: okUpdater,
      devMode: true,
    });
    expect(result).toEqual({ performed: false, reason: 'dev-mode' });
  });

  test('skips when fetcher returns null (no network)', async () => {
    const result = await performSelfUpdate({
      installedVersion: '0.1.5',
      fetcher: async () => null,
      updater: okUpdater,
    });
    expect(result).toEqual({ performed: false, reason: 'no-network' });
  });

  test('skips when running version >= latest', async () => {
    const result = await performSelfUpdate({
      installedVersion: '0.1.5',
      fetcher: async () => '0.1.5',
      updater: okUpdater,
    });
    expect(result).toEqual({ performed: false, reason: 'already-current' });
  });

  test('skips when running version is ahead of latest (dev build)', async () => {
    const result = await performSelfUpdate({
      installedVersion: '0.2.0',
      fetcher: async () => '0.1.7',
      updater: okUpdater,
    });
    expect(result).toEqual({ performed: false, reason: 'already-current' });
  });

  test('runs the updater and returns from/to when newer is available', async () => {
    let updaterCalled = false;
    const result = await performSelfUpdate({
      installedVersion: '0.1.5',
      fetcher: async () => '0.1.7',
      updater: async () => {
        updaterCalled = true;
        return { ok: true, stderr: '' };
      },
    });
    expect(updaterCalled).toBe(true);
    expect(result).toEqual({ performed: true, from: '0.1.5', to: '0.1.7' });
  });

  test('throws with stderr when the updater fails', async () => {
    await expect(
      performSelfUpdate({
        installedVersion: '0.1.5',
        fetcher: async () => '0.1.7',
        updater: failUpdater,
      }),
    ).rejects.toThrow(/bun update failed: EACCES on \/usr\/local/);
  });
});