import { env } from "@/env/server"

import type { NextRequest } from "next/server"
/**
 * Use this function when you want to create URLs that are public facing, for
 * example for redirects or redirectTo query parameters.
 * Dedicated environments are behind Akamai (test, stage, production). They have
 * env.PUBLIC_URL set.
 * All other environment like deploy previews and branch deployments are not
 * behind Akamai and therefore do not have env.PUBLIC_URL set.
 * We need this approach because Netlify uses x-forwarded-host internally and
 * strips it from ever reaching our code.
 * TODO: Replace this approach with custom header in Akamai that mirrors the
 * value in x-forwarded-host which would not get stripped by Netlify.
 * @param request The incoming request.
 * @returns NextURL The public facing URL instance for the given request.
 */
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
}

/**
 * Use this function when you want the public facing URL for the given request.
 * Read about the motivation in getPublicNextURL above.
 * @see getPublicNextURL
 * @param request The incoming request.
 * @returns string The public facing origin for the given request.
 */
export function getPublicURL(request: NextRequest) {
  if (env.PUBLIC_URL) {
    return env.PUBLIC_URL
  }
  return request.nextUrl.origin
}