function unicodeCharToAsciiDigit(ch: string): string {
  if (ch >= "0" && ch <= "9") return ch;
  const cp = ch.codePointAt(0)!;
  if (cp >= 0x06f0 && cp <= 0x06f9) return String(cp - 0x06f0);
  if (cp >= 0x0660 && cp <= 0x0669) return String(cp - 0x0660);
  if (cp >= 0x0966 && cp <= 0x096f) return String(cp - 0x0966);
  if (cp >= 0xff10 && cp <= 0xff19) return String(cp - 0xff10);
  const folded = ch.normalize("NFKC");
  if (folded.length === 1 && folded >= "0" && folded <= "9") return folded;
  return ch;
}

/**
 * Convert decimal digits in any Unicode script (Persian, Arabic-Indic, etc.)
 * to ASCII `0-9`. Other characters are left unchanged.
 */
export function normalizeUnicodeDigitsToEnglish(input: string): string {
  return Array.from(input).map(unicodeCharToAsciiDigit).join("");
}

/** Strip grouping separators after digit normalization (for money fields). */
export function normalizeMoneyAmountString(input: string): string {
  return normalizeUnicodeDigitsToEnglish(input)
    .trim()
    .replace(/[,،\u066C\u060C]/g, "");
}

/** Parse a money string to a whole **Toman** amount, or `null` if invalid. */
export function parseMoneyAmountToman(value: unknown): number | null {
  if (value == null || value === "") return null;
  const n = normalizeMoneyAmountString(String(value));
  if (!/^\d+$/.test(n)) return null;
  const num = Number(n);
  if (!Number.isFinite(num)) return null;
  return num;
}

export function normalizeUnicodeDigitsDeep<T>(value: T): T {
  if (value == null) return value;
  if (typeof value === "string") {
    return normalizeUnicodeDigitsToEnglish(value) as T;
  }
  if (Array.isArray(value)) {
    return value.map((item) => normalizeUnicodeDigitsDeep(item)) as T;
  }
  if (typeof value === "object") {
    const out: Record<string, unknown> = {};
    for (const [k, v] of Object.entries(value as Record<string, unknown>)) {
      out[k] = normalizeUnicodeDigitsDeep(v);
    }
    return out as T;
  }
  return value;
}