/**
 * Shell Completion Command Handler
 *
 * Handle --shell-completion command for CCS.
 */

import { initUI, header, ok, fail, color } from '../utils/ui';

/**
 * Handle shell completion command
 */
export async function handleShellCompletionCommand(args: string[]): Promise<void> {
  await initUI();
  const { ShellCompletionInstaller } = await import('../utils/shell-completion');

  console.log(header('Shell Completion Installer'));
  console.log('');

  // Parse flags
  let targetShell: string | null = null;
  const force = args.includes('--force') || args.includes('-f');
  if (args.includes('--bash')) targetShell = 'bash';
  else if (args.includes('--zsh')) targetShell = 'zsh';
  else if (args.includes('--fish')) targetShell = 'fish';
  else if (args.includes('--powershell')) targetShell = 'powershell';

  try {
    const installer = new ShellCompletionInstaller();
    const result = installer.install(targetShell as 'bash' | 'zsh' | 'fish' | 'powershell' | null, {
      force,
    });

    if (result.alreadyInstalled && !force) {
      console.log(ok('Shell completion already installed'));
      console.log(`    Use ${color('--force', 'warning')} to reinstall`);
      console.log('');
      return;
    }

    console.log(ok('Shell completion installed successfully!'));
    console.log('');
    console.log(result.message);
    console.log('');
    console.log(color('To activate:', 'info'));
    console.log(`  ${result.reload}`);
    console.log('');
    console.log(color('Then test:', 'info'));
    console.log('  ccs <TAB>        # See available profiles');
    console.log('  ccs auth <TAB>   # See auth subcommands');
    console.log('');
  } catch (error) {
    const err = error as Error;
    console.error(fail(`Error: ${err.message}`));
    console.error('');
    console.error(color('Usage:', 'warning'));
    console.error('  ccs --shell-completion           # Auto-detect shell');
    console.error('  ccs --shell-completion --bash    # Install for bash');
    console.error('  ccs --shell-completion --zsh     # Install for zsh');
    console.error('  ccs --shell-completion --fish    # Install for fish');
    console.error('  ccs --shell-completion --powershell  # Install for PowerShell');
    console.error('');
    process.exit(1);
  }
}