import { describe, it, expect } from 'vitest';
import { listEpisodeFiles, resolveStaticPath, contentType } from './brain-dashboard-server.mjs';
import { mkdtempSync, writeFileSync, mkdirSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

describe('listEpisodeFiles', () => {
  it('returns episodes-*.jsonl filenames sorted, ignores other files', () => {
    const root = mkdtempSync(join(tmpdir(), 'bd-'));
    const obs = join(root, 'docs', 'observer');
    mkdirSync(obs, { recursive: true });
    writeFileSync(join(obs, 'episodes-2026-05.jsonl'), '');
    writeFileSync(join(obs, 'episodes-2026-04.jsonl'), '');
    writeFileSync(join(obs, 'STATUS.md'), '');
    expect(listEpisodeFiles(root)).toEqual(['episodes-2026-04.jsonl', 'episodes-2026-05.jsonl']);
  });

  it('returns [] when the observer dir is missing', () => {
    const root = mkdtempSync(join(tmpdir(), 'bd-'));
    expect(listEpisodeFiles(root)).toEqual([]);
  });
});

describe('resolveStaticPath', () => {
  it('resolves a path inside root', () => {
    const root = '/srv/app';
    expect(resolveStaticPath('/docs/observer/dashboard.html', root))
      .toBe(join(root, 'docs', 'observer', 'dashboard.html'));
  });

  it('rejects path traversal with null', () => {
    expect(resolveStaticPath('/../../etc/passwd', '/srv/app')).toBeNull();
    expect(resolveStaticPath('/docs/../../secret', '/srv/app')).toBeNull();
  });
});

describe('contentType', () => {
  it('maps known extensions', () => {
    expect(contentType('.html')).toBe('text/html; charset=utf-8');
    expect(contentType('.js')).toBe('text/javascript; charset=utf-8');
    expect(contentType('.jsonl')).toBe('application/x-ndjson; charset=utf-8');
  });
  it('falls back to octet-stream', () => {
    expect(contentType('.xyz')).toBe('application/octet-stream');
  });
});