<?php

declare(strict_types=1);

namespace VK\Browsers;

use VK\Core;
use Exception;

class Curl extends BrowserAbstract
{
    /**
     * SSL шифрование
     * 
     * @var bool
     */
    private static bool $ssl = false;

    public static function post($url, $params = [])
    {
        $c = curl_init();
        curl_setopt($c, CURLOPT_HTTPHEADER, [
            "Content-Type:multipart/form-data"
        ]);
        curl_setopt($c, CURLOPT_URL, $url);
        curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($c, CURLOPT_POSTFIELDS, $params);
        curl_setopt($c, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($c, CURLOPT_SSL_VERIFYPEER, 0);
        $result = json_decode(curl_exec($c), True);
        curl_close($c);

        if (isset($result['response']))
            return $result['response'];
        else if (isset($result['error']))
            throw new Exception(json_encode($result), $result['error']['error_code']);
        else if (!isset($result))
            self::post($url, $params);
        else
            return $result;
    }

    public static function getToken($url)
    {
        if (!self::checkSSL('localhost')) {
            $core = Core::init();
            $core->logger->notice('Соединение не защищено. Необходимо включить SSL шифрование');
        }

        if ($curl = curl_init()) {
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);

            curl_setopt($curl, CURLOPT_USERAGENT, $_ENV['USERAGENT']);
            if (isset($post_values)) {
                curl_setopt($curl, CURLOPT_POST, 1);
                curl_setopt($curl, CURLOPT_POSTFIELDS, $post_values);
            }

            if ($cookie and isset(self::$cookie)) {
                $send_cookie = [];
                foreach (self::$cookie as $cookie_name => $cookie_val) {
                    $send_cookie[] = "$cookie_name=$cookie_val";
                }
                curl_setopt($curl, CURLOPT_COOKIE, join('; ', $send_cookie));
            }

            curl_setopt(
                $curl,
                CURLOPT_HEADERFUNCTION,
                function ($curl, $header) use (&$headers) {
                    $len = strlen($header);
                    $header = explode(':', $header, 2);
                    if (count($header) < 2) // ignore invalid headers
                        return $len;

                    $name = strtolower(trim($header[0]));
                    if (isset($headers) and !array_key_exists($name, $headers))
                        $headers[$name] = [trim($header[1])];
                    else
                        $headers[$name][] = trim($header[1]);

                    return $len;
                }
            );

            $out = curl_exec($curl);

            curl_close($curl);
            //if (isset($headers['set-cookie']))
            //    $this->parseCookie($headers['set-cookie']);
            return ['header' => $headers, 'body' => $out];
        }
    }

    protected static function checkSSL($domain)
    {
        $ssl_check = @fsockopen('ssl://' . $domain, 443, $errno, $errstr, 30);
        $res = !!$ssl_check;

        if ($ssl_check) {
            fclose($ssl_check);
        }

        return $res;
    }
}