/**
 * Cached `git status -sb` for the system prompt. Spawn is optional so Node tests
 * can inject a runner.
 */

const TTL_MS = 30000;

const cache = { cwd: '', at: 0, text: '' };

function formatStatus(stdout, stderr) {
  const body = String(stdout || '').trim() || String(stderr || '').trim();
  if (!body) return '';
  if (/not a git repository/i.test(body)) return '';
  const lines = body.split('\n').slice(0, 40);
  return '[git status]\n' + lines.join('\n');
}

async function gitStatusSb(cwd, opts) {
  opts = opts || {};
  if (!cwd || opts.hostWorkspace === false) return '';
  if (cache.cwd === cwd && Date.now() - cache.at < (opts.ttlMs || TTL_MS)) return cache.text;
  const run = opts.run;
  if (typeof run !== 'function') {
    cache.cwd = cwd;
    cache.at = Date.now();
    cache.text = '';
    return '';
  }
  try {
    const out = await run(cwd, 'git status -sb', opts.timeoutMs || 8000);
    const text = formatStatus(out && out.stdout, out && out.stderr);
    cache.cwd = cwd;
    cache.at = Date.now();
    cache.text = text;
    return text;
  } catch (_) {
    cache.cwd = cwd;
    cache.at = Date.now();
    cache.text = '';
    return '';
  }
}

function resetCache() {
  cache.cwd = '';
  cache.at = 0;
  cache.text = '';
}

module.exports = { TTL_MS, formatStatus, gitStatusSb, resetCache };