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<?php
/*
 * Copyright (C) 2023 Xibo Signage Ltd
 *
 * Xibo - Digital Signage - http://www.xibo.org.uk
 *
 * This file is part of Xibo.
 *
 * Xibo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * Xibo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Xibo.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Xibo\XTR;

use Carbon\Carbon;
use Slim\Views\Twig;
use Xibo\Factory\UserNotificationFactory;

/**
 * Class EmailNotificationsTask
 * @package Xibo\XTR
 */
class EmailNotificationsTask implements TaskInterface
{
    use TaskTrait;

/** @var Twig */
    private $view;

/** @var UserNotificationFactory */
    private $userNotificationFactory;

/** @inheritdoc */
    public function setFactories($container)
    {
        $this->view = $container->get('view');
        $this->userNotificationFactory = $container->get('userNotificationFactory');
        return $this;
    }

/** @inheritdoc */
    public function run()
    {
        $this->runMessage = '# ' . __('Email Notifications') . PHP_EOL . PHP_EOL;

$this->processQueue();
    }

/** Process Queue of emails
     * @throws \PHPMailer\PHPMailer\Exception
     */
    private function processQueue()
    {
        // Handle queue of notifications to email.
        $this->runMessage .= '## ' . __('Email Notifications') . PHP_EOL;

$msgFrom = $this->config->getSetting('mail_from');
        $msgFromName = $this->config->getSetting('mail_from_name');
        $processedNotifications = [];

$this->log->debug('Notification Queue sending from ' . $msgFrom);

foreach ($this->userNotificationFactory->getEmailQueue() as $notification) {
            $this->log->debug('Notification found: ' . $notification->notificationId);

if (!empty($notification->email) || $notification->isSystem == 1) {
                $mail = new \PHPMailer\PHPMailer\PHPMailer();

$this->log->debug('Sending Notification email to ' . $notification->email);
                $mail->addAddress($notification->email);

// System notifications, add mail_to to addresses if set.
                if ($notification->isSystem == 1) {
                    // We should send the system notification to:
                    //  - all assigned users
                    //  - the mail_to (if set)
                    $mailTo = $this->config->getSetting('mail_to');

// Make sure we've been able to resolve an address.
                    if (empty($notification->email) && empty($mailTo)) {
                        $this->log->error('Discarding NotificationId ' . $notification->notificationId
                            . ' as no email address could be resolved.');
                        continue;
                    }

// if mail_to is set and is different from user email, and we did not
                    // process this notification yet (the same notificationId will be returned for each assigned user)
                    // add it to addresses
                    if ($mailTo !== $notification->email
                        && !empty($mailTo)
                        && !in_array($notification->notificationId, $processedNotifications)
                    ) {
                        $this->log->debug('Sending Notification email to mailTo ' . $mailTo);
                        $mail->addAddress($mailTo);
                    }
                }

// Email them
                $mail->CharSet = 'UTF-8';
                $mail->Encoding = 'base64';
                $mail->From = $msgFrom;

// Add attachment
                if ($notification->filename != null) {
                    $mail->addAttachment(
                        $this->config->getSetting('LIBRARY_LOCATION') . 'attachment/' . $notification->filename,
                        $notification->originalFileName
                    );
                }

if (!empty($msgFromName)) {
                    $mail->FromName = $msgFromName;
                }

$mail->Subject = $notification->subject;

$addresses = explode(',', $notification->nonusers);
                foreach ($addresses as $address) {
                    $mail->AddAddress($address);
                }

// Body
                $mail->isHTML(true);
                $mail->AltBody = $notification->body;
                $mail->Body = $this->generateEmailBody($notification->subject, $notification->body);

if (!$mail->send()) {
                    $this->log->error('Unable to send email notification mail to ' . $notification->email);
                    $this->runMessage .= ' - E' . PHP_EOL;
                    $this->log->error('Unable to send email notification Error: ' . $mail->ErrorInfo);
                } else {
                    $this->runMessage .= ' - A' . PHP_EOL;
                }

$this->log->debug('Marking notification as sent');
            } else {
                $this->log->error('Discarding NotificationId ' . $notification->notificationId
                    . ' as no email address could be resolved.');
            }

$processedNotifications[] = $notification->notificationId;
            // Mark as sent
            $notification->setEmailed(Carbon::now()->format('U'));
            $notification->save();
        }

$this->runMessage .= ' - Done' . PHP_EOL;
    }

/**
     * Generate an email body
     * @param $subject
     * @param $body
     * @return string
     */
    private function generateEmailBody($subject, $body)
    {
        // Generate Body
        // Start an object buffer
        ob_start();

// Render the template
        echo $this->view->fetch('email-template.twig', ['config' => $this->config, 'subject' => $subject, 'body' => $body]);

$body = ob_get_contents();

ob_end_clean();

return $body;
    }
}