import { describe, it, expect } from 'vitest';
import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
// @ts-expect-error plain .mjs helper shared with scripts/generate-whats-new.mjs
import { extractHighlights, versionSection, buildWhatsNew } from '../scripts/lib/whats-new.mjs';

const root = resolve(import.meta.dirname, '..');

const CHANGELOG = `# aicodeman

## 1.2.0

### Minor Changes

- ### Thanks
  - @someone for a fix

  **The tile grid: six sessions side by side.** Body text with **inline bold** later.

- **Split view (#560).** More text.
- A bullet with no bold lead.

  **Behaviour change: \`Ctrl+W\` no longer closes a session.** Details.

## 1.1.0

- **Old feature.** Not for 1.2.0.
`;

describe('whats-new extraction', () => {
  it('limits itself to the requested version section', () => {
    const section = versionSection(CHANGELOG, '1.2.0');
    expect(section).toContain('tile grid');
    expect(section).not.toContain('Old feature');
    expect(versionSection(CHANGELOG, '9.9.9')).toBe('');
  });

  it('takes bold lead-ins only, cleaned, and skips the Thanks block', () => {
    expect(extractHighlights(versionSection(CHANGELOG, '1.2.0'))).toEqual([
      'The tile grid: six sessions side by side',
      'Split view (#560)',
      'Behaviour change: `Ctrl+W` no longer closes a session',
    ]);
  });

  it('caps the list', () => {
    const many = Array.from({ length: 20 }, (_, i) => `**Feature number ${i}.** text`).join('\n\n');
    expect(extractHighlights(many)).toHaveLength(8);
  });

  it('builds the payload the client reads', () => {
    expect(buildWhatsNew(CHANGELOG, '1.2.0').version).toBe('1.2.0');
  });
});

describe('shipped whats-new.json', () => {
  it("matches the package version, so a release cannot ship the previous release's notes", () => {
    const pkg = JSON.parse(readFileSync(resolve(root, 'package.json'), 'utf8'));
    const notes = JSON.parse(readFileSync(resolve(root, 'src/web/public/whats-new.json'), 'utf8'));
    expect(notes.version).toBe(pkg.version);
    // A release written without bold lead-ins legitimately has none (the client then stays
    // quiet), so an empty list must not turn the release commit's CI red.
    expect(Array.isArray(notes.highlights)).toBe(true);
  });

  it('is regenerated by the release script and consumed once per version by the client', () => {
    const pkg = readFileSync(resolve(root, 'package.json'), 'utf8');
    expect(pkg).toMatch(/"version-packages": "changeset version && node scripts\/generate-whats-new\.mjs/);
    const ui = readFileSync(resolve(root, 'src/web/public/settings-ui.js'), 'utf8');
    expect(ui).toContain("'codeman-whats-new-seen'");
    expect(ui).toContain("fetch('/whats-new.json'");
    expect(readFileSync(resolve(root, 'src/web/public/app.js'), 'utf8')).toContain(
      'this.checkWhatsNew?.(data.version)'
    );
  });
});