import { z } from "zod"

import { Lang } from "@/constants/languages"

export const langInput = z.object({
  lang: z.nativeEnum(Lang),
})

/**
 * Helper function to convert Lang enum to API lang enum.
 */
export const toApiLang = (lang: Lang): string => {
  const result = toApiLangMap[lang]
  if (!result) {
    throw new Error("Invalid language")
  }
  return result
}

const toApiLangMap: { [key in Lang]: string } = {
  [Lang.en]: "En",
  [Lang.sv]: "Sv",
  [Lang.no]: "No",
  [Lang.fi]: "Fi",
  [Lang.da]: "Da",
  [Lang.de]: "De",
}

/**
 * Helper function to convert lang string to Lang enum.
 */
export function toLang(lang: string): Lang | undefined {
  const lowerCaseLang = lang.toLowerCase()
  return Object.values(Lang).find((l) => l === lowerCaseLang)
}