import { clsx, type ClassValue } from 'clsx';
import { twMerge } from 'tailwind-merge';

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

/** Format µT amount to human-readable string */
export function formatAmount(microTokens: number | undefined | null): string {
  if (microTokens == null) return '—';
  if (microTokens >= 1_000_000) return `${(microTokens / 1_000_000).toFixed(2)} T`;
  if (microTokens >= 1_000)     return `${(microTokens / 1_000).toFixed(1)} mT`;
  return `${microTokens} µT`;
}

/** Format unix seconds to relative time */
export function relativeTime(unixSeconds: number | undefined | null): string {
  if (!unixSeconds) return '';
  const diff = Date.now() / 1000 - unixSeconds;
  if (diff < 60)    return 'just now';
  if (diff < 3600)  return `${Math.floor(diff / 60)}m ago`;
  if (diff < 86400) return `${Math.floor(diff / 3600)}h ago`;
  return new Date(unixSeconds * 1000).toLocaleDateString();
}

/** Format unix seconds to HH:MM */
export function formatTime(unixSeconds: number | undefined | null): string {
  if (!unixSeconds) return '';
  return new Date(unixSeconds * 1000).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
}

/** Generate a random nonce string */
export function randomId(): string {
  return Math.random().toString(36).slice(2) + Date.now().toString(36);
}