import { match } from '@formatjs/intl-localematcher'
import Negotiator from 'negotiator'
 
// Get the preferred locale, similar to the above or using a library
const locales = ['en', 'fa']

function getLocale(request) {
    const hostname = request.headers.get('host')?.split(':')[0]

    if (hostname === 'rahavardmgp.ir' || hostname === 'www.rahavardmgp.ir') {
      return 'fa'
    }

    if (hostname === 'rahavardmgp.com' || hostname === 'www.rahavardmgp.com') {
      return 'en'
    }

    const headers = {
      'accept-language': request.headers.get('accept-language') || 'fa'
    }
    const languages = new Negotiator({ headers }).languages()

    return match(languages, locales, 'fa')
}
 
export function middleware(request) {
  // Check if there is any supported locale in the pathname
  const { pathname } = request.nextUrl
  const pathnameHasLocale = locales.some(
    (locale) => pathname.startsWith(`/${locale}/`) || pathname === `/${locale}`
  )
 
  if (pathnameHasLocale) return
 
  // Redirect if there is no locale
  const locale = getLocale(request)
  request.nextUrl.pathname = `/${locale}${pathname}`
  // e.g. incoming request is /products
  // The new URL is now /en-US/products
  return Response.redirect(request.nextUrl)
}
 
export const config = {
  matcher: [
    // Skip internal Next.js paths and public files.
    '/((?!_next|.*\\..*).*)',
    // Optional: only run on root (/) URL
    // '/'
  ],
}