const PERSIAN_DIGITS = '۰۱۲۳۴۵۶۷۸۹'
const ARABIC_DIGITS = '٠١٢٣٤٥٦٧٨٩'

export function toEnglishDigits(value: string) {
  return value
    .replace(/[۰-۹]/g, (digit) => String(PERSIAN_DIGITS.indexOf(digit)))
    .replace(/[٠-٩]/g, (digit) => String(ARABIC_DIGITS.indexOf(digit)))
}

/** Keep only digits from any price-like string. */
export function parsePriceDigits(value: string): string {
  return toEnglishDigits(value).replace(/\D/g, '')
}

export function parsePriceNumber(value: string): number | null {
  const digits = parsePriceDigits(value)
  if (!digits) return null
  const number = Number(digits)
  return Number.isNaN(number) ? null : number
}

/** Display value for price inputs (Persian thousand separators). */
export function formatPriceInput(value: string | number | null | undefined) {
  if (value === null || value === undefined || value === '') return ''
  const digits =
    typeof value === 'number'
      ? String(Math.trunc(Math.abs(value)))
      : parsePriceDigits(value)
  if (!digits) return ''
  return new Intl.NumberFormat('fa-IR').format(Number(digits))
}

export function formatPrice(value: number) {
  return new Intl.NumberFormat('fa-IR').format(value)
}