<?php
if (!defined('SVRJS_MOD_DIRECTORY')) die;

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

function sendEmail($recipients, $subject, $message)
{
  // If no recipients, return true
  if (count($recipients) == 0) return true;

  $mail = new PHPMailer(false);

  // Email server data (SMTP or PHP mail function)
  if (EMAIL_SMTP) {
    $mail->isSMTP();
    $mail->Host = EMAIL_SMTP_HOST;
    if (EMAIL_SMTP_AUTHENTICATED) {
      $mail->SMTPAuth = true;
      $mail->Username = EMAIL_SMTP_USERNAME;
      $mail->Password = EMAIL_SMTP_PASSWORD;
    }
    if (EMAIL_SMTP_ENCRYPTION == 1) {
      $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    } elseif (EMAIL_SMTP_ENCRYPTION == 2) {
      $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;
    }
    $mail->Port = EMAIL_SMTP_PORT;
  } else {
    $mail->isMail();
  }

  // Email sender and recipient
  $mail->setFrom(EMAIL_FROM, EMAIL_FROM_NAME);
  foreach ($recipients as $recipient) {
    if (isset($recipient['name'])) $mail->addAddress($recipient['address'], $recipient['name']);
    else $mail->addAddress($recipient['address']);
  }

  // Email message
  $mail->Subject = $subject;
  $mail->Body = $message;

  return $mail->send();
}

function shortenDescription($description)
{
  if (strlen($description) <= 160) {
    return $description;
  } else {
    return substr($description, 0, 157) . '...';
  }
}

function formatFileSize($size)
{
  $units = ['B', 'KB', 'MB', 'GB', 'TB'];
  $formattedSize = $size;

  for ($i = 0; $size >= 1024 && $i < count($units) - 1; $i++) {
    $size /= 1024;
    $formattedSize = round($size, 2);
  }

  return $formattedSize . $units[$i];
}

function checkHCaptcha($hCaptchaResponse)
{
  if (!HCAPTCHA_ENABLED) return true;

  $data = array(
    'secret' => HCAPTCHA_SECRET_KEY,
    'response' => $hCaptchaResponse
  );

  $verify = curl_init();

  if (!$verify) {
    return false;
  }

  curl_setopt($verify, CURLOPT_URL, 'https://hcaptcha.com/siteverify');
  curl_setopt($verify, CURLOPT_POST, true);
  curl_setopt($verify, CURLOPT_POSTFIELDS, http_build_query($data));
  curl_setopt($verify, CURLOPT_RETURNTRANSFER, true);

  $response = curl_exec($verify);

  if (!$response) {
    return false;
  }

  $responseData = json_decode($response, true);

  if ($responseData && $responseData['success']) {
    return true;
  } else {
    return false;
  }
}

function checkStopForumSpam($username, $email)
{
  if (!STOPFORUMSPAM_ENABLED) return true;

  $data = array(
    'username' => $username,
    'email' => $email,
    'ip' => $_SERVER['REMOTE_ADDR'],
    'json'
  );

  $ch = curl_init();

  if (!$ch) {
    return null;
  }

  curl_setopt($ch, CURLOPT_URL, 'http://api.stopforumspam.org/api');
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

  $response = curl_exec($ch);

  if (!$response) {
    return null;
  }

  $responseData = json_decode($response, true);

  if ($responseData && $responseData['success']) {
    return !(
      (STOPFORUMSPAM_CHECK_USERNAME && $responseData && $responseData['username'] && $responseData['username']['appears'] && $responseData['username']['frequency'] >= STOPFORUMSPAM_THRESHOLD) ||
      (STOPFORUMSPAM_CHECK_EMAIL && $responseData && $responseData['email'] && $responseData['email']['appears'] && $responseData['email']['frequency'] >= STOPFORUMSPAM_THRESHOLD) ||
      (STOPFORUMSPAM_CHECK_IP && $responseData && $responseData['ip'] && $responseData['ip']['appears'] && $responseData['ip']['frequency'] >= STOPFORUMSPAM_THRESHOLD)
    );
  } else {
    return null;
  }
}

function setupHeaders()
{
  // Disable caching
  header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");
  header("Pragma: no-cache");
  if (COMPRESSION_ENABLED) {
    header("Vary: Accept-Encoding, Cookie");
  } else {
    header("Vary: Cookie");
  }

  // Remove "Expires" header
  header_remove("Expires");
}