<?php

/**
 * Kunena Component
 *
 * @package       Kunena.Framework
 * @subpackage    Email
 *
 * @copyright     Copyright (C) 2008 - @currentyear@ Kunena Team. All rights reserved.
 * @license       https://www.gnu.org/copyleft/gpl.html GNU/GPL
 * @link          https://www.kunena.org
 **/

namespace Kunena\Forum\Libraries\Email;

\defined('_JEXEC') or die();

use ErrorException;
use Exception;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Mail\Mail;
use Joomla\CMS\Mail\MailHelper;
use Kunena\Forum\Libraries\Factory\KunenaFactory;

/**
 * Class KunenaEmail
 *
 * @since   Kunena 6.0
 */
abstract class KunenaEmail
{
    /**
     * @var     object
     * @since   Kunena 6.0
     */
    public static $mailer_error_status = null;

    /**
     * @param   Mail $mail      mail
     * @param   array                 $receivers receivers
     *
     * @return boolean
     * @throws Exception
     * @since Kunena
     */
    public static function send($mail, array $receivers)
    {
        if (isset(static::$mailer_error_status)) {
            // Mailer is broken, so prevent any sending
            Log::add(static::$mailer_error_status->getMessage(), Log::ERROR, 'kunena');

            return false;
        }

        $config = KunenaFactory::getConfig();

        if (!empty($config->emailRecipientCount)) {
            $emailRecipientCount = $config->emailRecipientCount;
        } else {
            $emailRecipientCount = 1;
        }

        $emailRecipientPrivacy = $config->emailRecipientPrivacy ?: 'bcc';

        // If we hide email addresses from other users, we need to add TO address to prevent email from becoming spam.
        if (
            $emailRecipientCount > 1
            && $emailRecipientPrivacy == 'bcc'
            && MailHelper::isEmailAddress($config->emailVisibleAddress)
        ) {
            $mail->AddAddress($config->emailVisibleAddress, MailHelper::cleanAddress($config->boardTitle));

            // Also make sure that email receiver limits are not violated (TO + CC + BCC = limit).
            if ($emailRecipientCount > 9) {
                $emailRecipientCount--;
            }
        }

        $chunks = array_chunk($receivers, $emailRecipientCount);

        $success = true;

        foreach ($chunks as $emails) {
            if ($emailRecipientCount == 1 || $emailRecipientPrivacy == 'to') {
                $mail->ClearAddresses();
                $mail->addRecipient($emails);
            } elseif ($emailRecipientPrivacy == 'cc') {
                $mail->ClearCCs();
                $mail->addCC($emails);
            } else {
                $mail->ClearBCCs();
                $mail->addBCC($emails);
            }

            try {
                $mail->Send();
            } catch (Exception $e) {
                $success = false;
                Log::add($e->getMessage(), Log::ERROR, 'kunena');
            }
        }

        return $success;
    }

    /**
     * @param   integer  $errno    error number
     * @param   string   $errstr   error string
     * @param   string   $errfile  error file
     * @param   string   $errline  error line
     *
     * @return  boolean
     *
     * @since   Kunena 6.0
     */
    public static function on_mail_error(int $errno, string $errstr, string $errfile, string $errline): bool
    {
        if (strpos($errstr, "mail(): Failed to connect to mail server") !== false) {
            static::$mailer_error_status = new MailerBrokenException(
            	$errstr,
            	$errno,
            	Log::ERROR,
            	$errfile,
            	$errline
            );

            Log::add(static::$mailer_error_status->errorMessage(), Log::ERROR, 'kunena');
        }

        return false;
    }
}

/**
 * @since   Kunena 5.1.15
 */
class MailerBrokenException extends ErrorException
{
    /**
     * @return  string
     *
     * @since   Kunena 5.1.15
     */
    public function errorMessage(): string
    {
        return "$this->code - $$this->message\n at: $$this->file:$$this->line";
    }
}