const SUBCOMMAND_HELP: Record<string, string> = {
  config: [
    'Usage: gsd config',
    '',
    'Re-run the interactive setup wizard to configure:',
    '  - LLM provider (Anthropic, OpenAI, Google, etc.)',
    '  - Web search provider (Brave, Tavily, built-in)',
    '  - Remote questions (Discord, Slack, Telegram)',
    '  - Tool API keys (Context7, Jina, Groq)',
    '',
    'All steps are skippable and can be changed later with /login or /search-provider.',
  ].join('\n'),

  update: [
    'Usage: gsd update',
    '',
    'Update GSD to the latest version.',
    '',
    'Equivalent to: npm install -g gsd-pi@latest',
  ].join('\n'),

  sessions: [
    'Usage: gsd sessions',
    '',
    'List all saved sessions for the current directory and interactively',
    'pick one to resume. Shows date, message count, and a preview of the',
    'first message for each session.',
    '',
    'Sessions are stored per-directory, so you only see sessions that were',
    'started from the current working directory.',
    '',
    'Compare with --continue (-c) which always resumes the most recent session.',
  ].join('\n'),
}

export function printHelp(version: string): void {
  process.stdout.write(`GSD v${version} — Get Shit Done\n\n`)
  process.stdout.write('Usage: gsd [options] [message...]\n\n')
  process.stdout.write('Options:\n')
  process.stdout.write('  --mode <text|json|rpc|mcp> Output mode (default: interactive)\n')
  process.stdout.write('  --print, -p              Single-shot print mode\n')
  process.stdout.write('  --continue, -c           Resume the most recent session\n')
  process.stdout.write('  --model <id>             Override model (e.g. claude-opus-4-6)\n')
  process.stdout.write('  --no-session             Disable session persistence\n')
  process.stdout.write('  --extension <path>       Load additional extension\n')
  process.stdout.write('  --tools <a,b,c>          Restrict available tools\n')
  process.stdout.write('  --list-models [search]   List available models and exit\n')
  process.stdout.write('  --version, -v            Print version and exit\n')
  process.stdout.write('  --help, -h               Print this help and exit\n')
  process.stdout.write('\nSubcommands:\n')
  process.stdout.write('  config                   Re-run the setup wizard\n')
  process.stdout.write('  update                   Update GSD to the latest version\n')
  process.stdout.write('  sessions                 List and resume a past session\n')
  process.stdout.write('\nRun gsd <subcommand> --help for subcommand-specific help.\n')
}

export function printSubcommandHelp(subcommand: string, version: string): boolean {
  const help = SUBCOMMAND_HELP[subcommand]
  if (!help) return false
  process.stdout.write(`GSD v${version} — Get Shit Done\n\n`)
  process.stdout.write(help + '\n')
  return true
}