export function externalSkillName(skillDir: string, frontmatterName?: string): string {
  if (skillDir === '.' || skillDir === '') return 'gstack';
  const baseName = frontmatterName && frontmatterName !== skillDir ? frontmatterName : skillDir;
  if (baseName.startsWith('gstack-')) return baseName;
  return `gstack-${baseName}`;
}

export function extractNameAndDescription(content: string): { name: string; description: string } {
  const fmStart = content.indexOf('---\n');
  if (fmStart !== 0) return { name: '', description: '' };
  const fmEnd = content.indexOf('\n---', fmStart + 4);
  if (fmEnd === -1) return { name: '', description: '' };

  const frontmatter = content.slice(fmStart + 4, fmEnd);
  const nameMatch = frontmatter.match(/^name:\s*(.+)$/m);
  const name = nameMatch ? nameMatch[1].trim() : '';

  let description = '';
  const lines = frontmatter.split('\n');
  let inDescription = false;
  const descLines: string[] = [];
  for (const line of lines) {
    if (line.match(/^description:\s*\|?\s*$/)) {
      inDescription = true;
      continue;
    }
    if (line.match(/^description:\s*\S/)) {
      description = line.replace(/^description:\s*/, '').trim();
      break;
    }
    if (inDescription) {
      if (line === '' || line.match(/^\s/)) {
        descLines.push(line.replace(/^  /, ''));
      } else {
        break;
      }
    }
  }
  if (descLines.length > 0) description = descLines.join('\n').trim();

  return { name, description };
}