<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cookie;
use Illuminate\Support\Facades\View;

class LangCheck
{

    protected $langs = ['fr','en','es'];
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {

        $routName = $request->route()->getName();
        if (preg_match('/^bo\./', $routName)) {
            //Back office
            if ($request->lang) {
                //within bo we set lang with querystring param
                $this->saveUserLocale($request->lang, $request);
                //bonus remove lang parameter from query
                return redirect()->to($request->fullUrlWithoutQuery('lang'));
            } else {
                $this->checkFirstAccess($request);
            }
        } else {
            //FRONT
            if (preg_match('/^(en|es)\./', $routName)) {
                //from front use named routes
                $langset = $request->segment(1);

                $this->saveUserLocale($langset, $request);
            } else {
                //not specified in route
                if ($this->checkFirstAccess($request)) {
                    $routNameEN = 'en.' . $routName;
                    $routNameES = 'es.' . $routName;
                    $sess_lang = $request->session()->get('lang', config('app.locale'));
                    switch ($sess_lang) {
                        case 'en':
                            return redirect()->route($routNameEN);
                        case 'es':
                            return redirect()->route($routNameES);
                    }
                }

                $langset = 'fr';
                $this->saveUserLocale($langset, $request);
            }
        }


        $sess_lang = $request->session()->get('lang', config('app.locale'));
        app()->setLocale($sess_lang);
        $routePrefixer = "";
        if($sess_lang != 'fr') {
            $routePrefixer = $sess_lang . '.';
        }
        View::share('routeprefixer', $routePrefixer);

        return $next($request);
    }


    /**
     *
     */
    private function saveUserLocale($lang, Request $request)
    {
        //Set cookie
        Cookie::queue(Cookie::forever('language', strtolower($lang)));
        //set session
        $request->session()->put('lang', strtolower($lang));
    }

    /**
     * checks if we have saved locale info for current user
     * if not find then save that locale
     * @return boolean
     */
    private function checkFirstAccess(Request $request)
    {
        //do we have session ?
        if (!$request->session()->has('lang')) {
            $fromC = Cookie::get('language');
            if (is_null($fromC) || empty($fromC)) {
                //pas de cookie, recherche sur le navigateur
                $fromC = substr($request->server('HTTP_ACCEPT_LANGUAGE'), 0, 2);
                if (!in_array($fromC, $this->langs)) {
                    //default other languages to en
                    $fromC = 'en';
                }
            }
            $this->saveUserLocale($fromC, $request);
            return true;
        }
        //we have lang session
        return false;
    }
}