const LATIN_TO_PERSIAN: Record<string, string> = {
  "0": "۰",
  "1": "۱",
  "2": "۲",
  "3": "۳",
  "4": "۴",
  "5": "۵",
  "6": "۶",
  "7": "۷",
  "8": "۸",
  "9": "۹",
};

/**
 * Convert Latin digits in a string to Persian digits.
 * Leaves non-digit characters unchanged. Use for UI labels, stats,
 * dates, and counters — not for technical IDs or code.
 */
export function toPersianDigits(value: string | number): string {
  return String(value).replace(/[0-9]/g, (digit) => LATIN_TO_PERSIAN[digit] ?? digit);
}

/**
 * Format a number for Persian UI (locale grouping + Persian digits).
 */
export function formatPersianNumber(
  value: number,
  options?: Intl.NumberFormatOptions
): string {
  return toPersianDigits(
    new Intl.NumberFormat("fa-IR", options).format(value)
  );
}