export function formatDate(value: string | Date | null | undefined): string {
  if (!value) return '—';
  const d = typeof value === 'string' ? new Date(value) : value;
  return d.toLocaleDateString(undefined, { year: 'numeric', month: 'short', day: 'numeric' });
}

export function formatHours(minutes: number): string {
  const h = minutes / 60;
  return h >= 10 ? `${h.toFixed(0)}h` : `${h.toFixed(1)}h`;
}

export function formatMoney(amount: string | number | null | undefined): string {
  if (amount == null || amount === '') return '—';
  const n = typeof amount === 'string' ? Number(amount) : amount;
  if (!Number.isFinite(n)) return '—';
  return new Intl.NumberFormat(undefined, { style: 'currency', currency: 'USD' }).format(n);
}

export function formatBytes(bytes: number): string {
  if (bytes < 1024) return `${bytes} B`;
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
}

export function planLimitMessage(code: string | undefined, fallback = 'Action not allowed.'): string {
  switch (code) {
    case 'plan_limit_clients':
      return "You've hit your plan's client limit. Upgrade to add more.";
    case 'plan_limit_activeCases':
      return "You've hit your plan's active-case limit. Close a case or upgrade.";
    case 'plan_limit_invoicesPerMonth':
      return "You've hit your monthly invoice limit. Upgrade for unlimited invoicing.";
    case 'plan_limit_storageBytes':
      return "You've hit your storage limit. Delete files or upgrade.";
    default:
      return fallback;
  }
}