<?php

namespace App\Http\Requests\LDCNetworks;

use App\Rules\CidrRule;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Session;

class StoreLDCNetwork extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return boolean
     */
    public function authorize()
    {
        return Auth::check();
    }

    /**
     * Prepare the data for validation.
     *
     * @return void
     */
    protected function prepareForValidation()
    {
        $this->merge($this->cidrToRange());
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'cidr' => ['required', new CidrRule()],
            'first_ip' => 'required|ipv4',
            'last_ip' => 'required|ipv4'
        ];
    }

    /**
     * cidr To Ranges
     *
     * @return array ['first_ip', 'last_ip']
     */
    private function cidrToRange(): array
    {
        $first_ip = '';
        $last_ip  = '';
        $cidr     = collect(explode('/', \strval($this->cidr)));
        try {
            $first_ip = long2ip(intval(ip2long($cidr->get(0))) & ((-1 << (32 - intval($cidr->get(1))))));
            $last_ip  = long2ip(intval(ip2long(\strval($first_ip))) + pow(2, (32 - intval($cidr->get(1)))) - 1);
        } catch (\Error $e) {
            Session::flash('warning', trans('Le CIDR est mal formé'));
        }
        return \compact('first_ip', 'last_ip');
    }
}