/**
 * Grep helpers: glob match + output modes. No Bare imports.
 */

function globToRegExp(glob) {
  const g = String(glob || '').replace(/\\/g, '/');
  if (!g) return null;
  let out = '^';
  for (let i = 0; i < g.length; i++) {
    const c = g[i];
    if (c === '*' && g[i + 1] === '*') {
      out += '.*';
      i += 1;
      if (g[i + 1] === '/') i += 1;
    } else if (c === '*') out += '[^/]*';
    else if (c === '?') out += '[^/]';
    else if ('\\.()+^$[]{}|'.indexOf(c) >= 0) out += '\\' + c;
    else out += c;
  }
  out += '$';
  return new RegExp(out, 'i');
}

function matchGlob(relPath, glob) {
  if (!glob) return true;
  const rel = String(relPath || '').replace(/\\/g, '/');
  const re = globToRegExp(glob);
  if (!re) return true;
  if (re.test(rel)) return true;
  const base = rel.split('/').pop();
  return re.test(base);
}

function formatHits(hits, mode, truncated) {
  const list = hits || [];
  const m = String(mode || 'content').toLowerCase();
  if (m === 'count') {
    const by = {};
    for (const h of list) {
      const p = h.path || '';
      by[p] = (by[p] || 0) + 1;
    }
    return { mode: 'count', files: by, truncated: !!truncated };
  }
  if (m === 'files_with_matches' || m === 'files') {
    const seen = [];
    const set = new Set();
    for (const h of list) {
      if (!set.has(h.path)) {
        set.add(h.path);
        seen.push(h.path);
      }
    }
    return { mode: 'files_with_matches', files: seen, truncated: !!truncated };
  }
  return { mode: 'content', hits: list, truncated: !!truncated };
}

module.exports = { globToRegExp, matchGlob, formatHits };