const PERSIAN_DIGITS = /[۰-۹]/g;
const PERSIAN_TO_ENGLISH: Record<string, string> = {
  '۰': '0',
  '۱': '1',
  '۲': '2',
  '۳': '3',
  '۴': '4',
  '۵': '5',
  '۶': '6',
  '۷': '7',
  '۸': '8',
  '۹': '9',
};

export const normalizePhoneNumber = (value: string): string => {
  if (!value) {
    return '';
  }

  const normalized = value.replace(PERSIAN_DIGITS, (digit) => PERSIAN_TO_ENGLISH[digit] ?? digit);
  return normalized.trim();
};

export const toE164PhoneNumber = (value: string): string => {
  const normalized = normalizePhoneNumber(value);
  const digits = normalized.replace(/\D/g, '');

  if (!digits) {
    return '';
  }

  if (digits.startsWith('98')) {
    return `+${digits}`;
  }

  if (digits.startsWith('0')) {
    return `+98${digits.slice(1)}`;
  }

  return `+${digits}`;
};