import { type NextMiddleware, NextResponse } from "next/server"

import { Lang } from "@scandic-hotels/common/constants/language"

import { getPublicNextURL } from "@/server/utils"

import { getDefaultRequestHeaders } from "./utils"

import type { MiddlewareMatcher } from "@/types/middleware"

export const middleware: NextMiddleware = (request) => {
  const headers = getDefaultRequestHeaders(request)
  const preferredLang = request.cookies.get("preferredLang")?.value ?? Lang.en

  // Set x-lang header
  headers.set("x-lang", preferredLang)

  // Redirect to new URL if no lang in URL
  const newUrl = new URL(`/${preferredLang}`, getPublicNextURL(request))
  return NextResponse.redirect(newUrl, {
    headers,
  })
}

export const matcher: MiddlewareMatcher = (request) => {
  // if ULR is empty
  return request.nextUrl.pathname.length <= 1
}