<?php
namespace EEPROM\Auth;

use RuntimeException;
use Index\Serialisation\Serialiser;

class MisuzuAuth implements IAuth {
    private $endPoint = '';
    private $secretKey = '';

    public function __construct() {
        global $cfg;

        $this->endPoint = $cfg->getString('misuzu:endpoint');
        $this->secretKey = $cfg->getString('misuzu:secret');
    }

    public function getName(): string { return 'Misuzu'; }

    public function verifyToken(string $token): int {
        if(empty($token))
            return 0;

        $method = 'Misuzu';
        $signature = sprintf('verify#%s#%s#%s', $method, $token, $_SERVER['REMOTE_ADDR']);
        $signature = hash_hmac('sha256', $signature, $this->secretKey);

        $login = curl_init($this->endPoint);
        curl_setopt_array($login, [
            CURLOPT_AUTOREFERER => false,
            CURLOPT_FAILONERROR => false,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_HEADER => false,
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => http_build_query([
                'method' => $method,
                'token' => $token,
                'ipaddr' => $_SERVER['REMOTE_ADDR'],
            ], '', '&', PHP_QUERY_RFC3986),
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TCP_FASTOPEN => true,
            CURLOPT_CONNECTTIMEOUT => 2,
            CURLOPT_MAXREDIRS => 2,
            CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
            CURLOPT_TIMEOUT => 5,
            CURLOPT_USERAGENT => 'Flashii EEPROM',
            CURLOPT_HTTPHEADER => [
                'Content-Type: application/x-www-form-urlencoded',
                'X-SharpChat-Signature: ' . $signature,
            ],
        ]);
        $rawUserInfo = curl_exec($login);
        $userInfo = json_decode($rawUserInfo);
        curl_close($login);

        return empty($userInfo->success) || empty($userInfo->user_id) ? 0 : $userInfo->user_id;
    }
}