import { z } from "zod"

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

import type { NextRequest } from "next/server"

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)
}

export function getPublicURL(request: NextRequest) {
  if (env.PUBLIC_URL) {
    return env.PUBLIC_URL
  }

  const host = request.nextUrl.host
  const proto = request.nextUrl.protocol
  return `${proto}//${host}`
}

export function getPublicNextURL(request: NextRequest) {
  if (env.PUBLIC_URL) {
    const publicNextURL = request.nextUrl.clone()
    // Akamai in front of Netlify for dedicated environments
    // require us to rewrite the incoming host and hostname
    // to match the public URL used to visit Akamai.
    const url = new URL(env.PUBLIC_URL)
    publicNextURL.host = url.host
    publicNextURL.hostname = url.hostname
    return publicNextURL
  }
  return request.nextUrl
}