import { type IntlConfig } from '../CurrencyInputProps'

interface LocaleConfig {
  currencySymbol: string
  groupSeparator: string
  decimalSeparator: string
  prefix: string
  suffix: string
}

const defaultConfig: LocaleConfig = {
  currencySymbol: '',
  groupSeparator: '',
  decimalSeparator: '',
  prefix: '',
  suffix: ''
}

/**
 * Get locale config from input or default
 */
export const getLocaleConfig = (intlConfig?: IntlConfig): LocaleConfig => {
  const { locale, currency, ...formatOptions } = intlConfig || {}
  const numberFormatter = locale
    ? new Intl.NumberFormat(locale, {
      ...formatOptions,
      ...(currency && { currency, style: 'currency' })
    })
    : new Intl.NumberFormat()

  return numberFormatter.formatToParts(1000.1).reduce((prev, curr, i): LocaleConfig => {
    if (curr.type === 'currency') {
      if (i === 0) {
        return { ...prev, currencySymbol: curr.value, prefix: curr.value }
      } else {
        return { ...prev, currencySymbol: curr.value, suffix: curr.value }
      }
    }
    if (curr.type === 'group') {
      return { ...prev, groupSeparator: curr.value }
    }
    if (curr.type === 'decimal') {
      return { ...prev, decimalSeparator: curr.value }
    }

    return prev
  }, defaultConfig)
}