import { dt } from "@scandic-hotels/common/dt"

import type { IntlShape } from "react-intl"

export const DAYS_UNTIL_EXPIRY_WARNING = 30

/**
 * Get expiry label for points based on the expiry date.
 * @returns The formatted expiry date text or empty string if no expiry date
 */
export function getExpiryLabel(
  pointsExpiryDate: string | undefined,
  intl: IntlShape,
  lang: string
): string {
  if (!pointsExpiryDate) {
    return ""
  }

  const now = dt()
  const expiryDate = dt(pointsExpiryDate).locale(lang)
  const daysUntilExpiry = expiryDate.diff(now, "days")

  if (daysUntilExpiry <= DAYS_UNTIL_EXPIRY_WARNING) {
    return intl.formatMessage(
      {
        id: "points.pointsToSpendCard.inDays",
        defaultMessage: "In {days} days",
      },
      {
        days: daysUntilExpiry,
      }
    )
  } else {
    return intl.formatMessage(
      {
        id: "points.pointsToSpendCard.onDate",
        defaultMessage: "on {expiryDate}",
      },
      {
        expiryDate: expiryDate.format("DD MMM YYYY"),
      }
    )
  }
}