export type PackageActionMode = 'install' | 'uninstall' | 'mixed';

/**
 * Classify a set of npm package operations. `action` defaults to 'install'
 * when unset, matching the tool schema (omitted action ⇒ install).
 */
export function getPackageActionMode(
  packages: ReadonlyArray<{ action?: string } | null | undefined>,
): PackageActionMode {
  const hasUninstall = packages.some((p) => p?.action === 'uninstall');
  const hasInstall = packages.some((p) => p != null && p.action !== 'uninstall');
  return hasInstall && hasUninstall ? 'mixed' : hasUninstall ? 'uninstall' : 'install';
}