<?php

namespace App\Http\Middleware;

use App\Models\LDCNetwork as ModelsLDCNetwork;
use Closure;
use Illuminate\Support\Facades\Cache;

class LDCNetwork
{
    /**
     * Handle an incoming request.
     *
     * @param  mixed    $request
     * @param  \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if (\config('app.env') === 'local' || (\config('app.env') === 'production' && \config('app.debug') === true)) {
            return $next($request);
        }

        /** HA PROXY HACK */
        $ip            = request()->server('HTTP_X_FORWARDED_FOR') ?? request()->getClientIp();
        $restrictedIps = Cache::get('ldcweb_ip_ranges');

        if (\is_null($restrictedIps)) {
            $networks      = ModelsLDCNetwork::all();
            $networks      = $networks->map(function (ModelsLDCNetwork $network) {
                $infos = collect(explode('.', strval($network->first_ip)));
                $min   = intval($infos->get(3));
                $max   = collect(explode('.', strval($network->last_ip)))->get(3);
                for ($i = $min; $i <= $max; $i++) {
                    $restrictedIps[] = $infos->get(0) . '.' .
                        $infos->get(1) . '.' .
                        $infos->get(2) . ".$i";
                }
                return $restrictedIps;
            });
            $restrictedIps = [];
            foreach ($networks->toArray() as $network) {
                $restrictedIps = array_merge($restrictedIps, $network);
            }
            Cache::put('ldcweb_ip_ranges', $restrictedIps, now()->addHours(4));
        }

        if (!is_null($restrictedIps) && in_array($ip, $restrictedIps)) {
            return $next($request);
        }
        abort(403);
    }
}