/**
 * The browser runtime is described in two languages: an Ansible role
 * installs it, and TypeScript reads it back. Nothing in either language
 * can see the other, so these are the assertions that keep them agreeing.
 *
 * Both facts here have already drifted in other pairs of files in this
 * repo; neither drift is visible in a diff.
 */

import { describe, expect, test } from 'bun:test';
import { readFileSync } from 'node:fs';
import { join } from 'node:path';
import {
  BROWSER_DESCRIPTOR_PATH,
  BROWSER_EXECUTABLE_PATH,
  BROWSER_ROOT,
} from '@celilo/capabilities';

const MODULE_ROOT = join(import.meta.dir, '../../../../modules/celilo-mgmt');

function read(relativePath: string): string {
  return readFileSync(join(MODULE_ROOT, relativePath), 'utf-8');
}

describe('celilo-mgmt browser provisioning', () => {
  test('the playbook stamps the module version the manifest declares', () => {
    // The descriptor records which celilo-mgmt wrote it. No template prefix
    // exposes a module's own version ($self: resolves module CONFIG), so
    // the playbook carries a literal — and this is what stops it rotting.
    const manifestVersion = read('manifest.yml').match(/^version:\s*(\S+)$/m)?.[1];
    const playbookVersion = read('ansible/playbook.yml.tpl').match(
      /celilo_mgmt_version:\s*"([^"]+)"/,
    )?.[1];

    expect(manifestVersion).toBeTruthy();
    expect(playbookVersion).toBe(manifestVersion as string);
  });

  test('the role installs into the tree the resolver reads', () => {
    const debian = read('ansible/roles/celilo-mgmt/tasks/debian.yml');

    expect(BROWSER_EXECUTABLE_PATH).toBe(`${BROWSER_ROOT}/current/chrome`);
    expect(debian).toContain(`PLAYWRIGHT_BROWSERS_PATH: ${BROWSER_ROOT}`);
    expect(debian).toContain(`dest: ${BROWSER_EXECUTABLE_PATH}`);
    expect(debian).toContain(`dest: ${BROWSER_DESCRIPTOR_PATH}`);
  });

  test('the install is gated, so a default host downloads nothing', () => {
    const debian = read('ansible/roles/celilo-mgmt/tasks/debian.yml');
    const manifest = read('manifest.yml');

    expect(debian).toContain('when: celilo_install_browser | bool');
    // The gate is worthless if the flag defaults on: the e2e topology has
    // no real internet, and the browser comes from an external CDN.
    expect(manifest).toMatch(/name: install_browser[\s\S]*?default: false/);
  });

  test('the role provisions the headless shell, not full Chromium', () => {
    // Reversed after measuring celilo-mgr: both builds there are headless
    // shells and chromium.launch() has been driving one in production all
    // along. Provisioning the full browser would change what works.
    const debian = read('ansible/roles/celilo-mgmt/tasks/debian.yml');

    expect(debian).toContain('install chromium-headless-shell');
    expect(debian).toContain("'flavor': 'headless-shell'");
  });
});