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Filename : scheduler.php
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<?php
/** @var NewsletterSystemAdmin $this */
/** @var NewsletterControls $controls */

/** @var wpfb $wpdb */
use Newsletter\License;

defined('ABSPATH') || exit;

wp_enqueue_script('tnp-chart');

if ($controls->is_action('reset')) {
    $this->reset_cron_stats();
    $controls->add_message('Statistics reset, now wait at least one hour to see new valid data');
}

if ($controls->is_action('reschedule')) {
    wp_clear_scheduled_hook('newsletter');
    wp_schedule_event(time() + 30, 'newsletter', 'newsletter');
    $controls->add_message_done();
}

if ($controls->is_action('trigger')) {
    wp_clear_scheduled_hook('newsletter');
    wp_schedule_event(time() + NEWSLETTER_REAL_CRON_INTERVAL, 'newsletter', 'newsletter');
    Newsletter::instance()->hook_newsletter();
    $controls->add_message_done();
}

if ($controls->is_action('test')) {
    $response = wp_remote_get(site_url('/wp-cron.php') . '?' . time());
    if (is_wp_error($response)) {
        $controls->errors = 'Test failed: ' . esc_html($response->get_error_message());
    } else if (wp_remote_retrieve_response_code($response) != 200) {
        $controls->errors = 'Test failed: ' . esc_html(wp_remote_retrieve_response_message($response));
    } else {
        $controls->add_message('Test ok');
    }

    if ($controls->errors) {
        $controls->errors .= '<br>Report this error to your provider saying the site cannot make an HTTP call to its wp-cron.php file and copying the error message above.';
    }
}

$stats = $this->get_cron_stats();

if (isset($_GET['debug']) || !defined('Crontrol\WP_CRONTROL_VERSION')) {
    $controls->add_message('If you experience problems with the scheduler, please install the plugin <a href="https://wordpress.org/plugins/wp-crontrol/" target="_blank">WP Crontrol</a> and check the Tools/Events page.');
}
?>

<style>
<?php include __DIR__ . '/css/system.css' ?>
</style>

<div class="wrap tnp-system tnp-system-scheduler" id="tnp-wrap">

    <?php include NEWSLETTER_ADMIN_HEADER; ?>

    <div id="tnp-heading">
        <?php include __DIR__ . '/nav.php' ?>
    </div>

    <div id="tnp-body">

        <?php $controls->show() ?>


        <form method="post" action="">
            <?php $controls->init(); ?>

            <p><?php $controls->btn('reset', __('Reset statistics', 'newsletter'), ['confirm' => true, 'secondary' => true]); ?></p>


            <div class="tnp-dashboard">
                <div class="tnp-cards-container">
                    <div class="tnp-card">
                        <p>
                            The scheduler is a WordPress component that executes <strong>background tasks</strong>
                            (publish future post, run backups, send newsletters, ...).
                            <br>
                            Here some steps you can consider if the scheduler has issues.
                        </p>
                        <ul>
                            <li>Check the <a href="<?php echo admin_url('/site-health.php') ?>">site health panel</a> and try to solve the issues identified by WordPress in your site</li>
                            <li>Install the <a href="https://wordpress.org/plugins/wp-crontrol/" target="_blank">WP Crontrol</a> plugin which shows all the scheduled jobs and delays</li>
                            <li>Configure an <a href="https://www.thenewsletterplugin.com/documentation/delivery-and-spam/newsletter-delivery-engine/" target="_blank">external cron service</a>
                                (if you have a license you can use our <a href="https://www.thenewsletterplugin.com/account/cron/" target="_blank">cron service</a>)</li>
                        </ul>
                    </div>

                    <div class="tnp-card">
                        <table class="widefat">
                            <thead>
                                <tr>
                                    <th>Parameter</th>
                                    <th></th>
                                    <th>Notes</th>
                                </tr>
                            </thead>

                            <?php if (!$stats) { ?>
                                <tr>
                                    <td>Scheduler</td>
                                    <td class="status">
                                        <?php $this->condition_flag(1) ?>
                                    </td>
                                    <td>
                                        Collecting data...
                                    </td>
                                </tr>
                            <?php } else { ?>
                                <?php
                                $condition = $stats->good ? 1 : 0;
                                ?>
                                <tr>
                                    <td>Scheduler</td>
                                    <td class="status">
                                        <?php $this->condition_flag($condition) ?>
                                    </td>
                                    <td>
                                        <?php if ($condition == 0) { ?>
                                            The cron system is NOT triggered enough often.<br>
                                            <?php $controls->btn_link('https://www.thenewsletterplugin.com/documentation/delivery-and-spam/newsletter-delivery-engine/', 'How to solve'); ?>
                                        <?php } ?>
                                    </td>
                                </tr>
                            <?php } ?>


                            <?php
                            $status = $this->get_job_status();
                            $condition = $status == NewsletterSystemAdmin::JOB_OK ? 1 : 0;
                            ?>
                            <tr>
                                <td>Delivery job</td>
                                <td class="status">
                                    <?php $this->condition_flag($condition, 'https://www.thenewsletterplugin.com/documentation/delivery-and-spam/newsletter-delivery-engine/') ?>
                                </td>
                                <td>
                                    <?php
                                    switch ($status) {
                                        case NewsletterSystemAdmin::JOB_MISSING:
                                            echo 'The job is missing! Try to deactivate and reactivate the Newsletter plugin.';
                                            break;
                                        case NewsletterSystemAdmin::JOB_LATE:
                                            echo 'The job is late. You probably need and <a href="https://www.thenewsletterplugin.com/documentation/troubleshooting/newsletter-delivery-engine/">external scheduler trigger</a>.';
                                            break;
                                        case NewsletterSystemAdmin::JOB_SKIPPED:
                                            echo 'The job has been skipped! The scheduler is overloaded or a job has fatal error and blocks the scheduler: <a target="blank" href="https://www.thenewsletterplugin.com/documentation/troubleshooting/newsletter-delivery-engine/#job-skipped">external scheduler trigger</a>.';
                                            break;
                                        case NewsletterSystemAdmin::JOB_FAR_FUTURE:
                                            echo 'The job is planned too far into the future. Someone/something changed it! <a target="blank" href="https://www.thenewsletterplugin.com/documentation/troubleshooting/newsletter-delivery-engine/#job-far-future">Read here to fix</a>.';
                                            break;
                                        case NewsletterSystemAdmin::JOB_OK:
                                            echo 'Everything seems fine!';
                                            break;
                                    }
                                    ?>
                                </td>
                            </tr>
                            <tr>
                                <td>Job next run</td>
                                <td class="status">
                                </td>
                                <td>
                                    <?php $controls->echo_date($this->get_job_schedule(), false, true) ?>

                                    <?php
                                    if ($status == NewsletterSystemAdmin::JOB_LATE) {
                                        $controls->button('trigger', 'Run manually');
                                    }
                                    ?>
                                </td>
                            </tr>


                            <tr>
                                <td>Last cron call</td>
                                <td class="status">&nbsp;</td>
                                <td>
                                    <?php $controls->echo_date($this->get_last_cron_call()) ?>
                                </td>
                            </tr>

                            <tr>
                                <td>Scheduler working?</td>
                                <td class="status">&nbsp;</td>
                                <td>
                                    <?php echo get_transient('doing_cron') ? 'Yes' : 'No'; ?>
                                </td>
                            </tr>

                        </table>
                    </div>
                </div>


                <div class="tnp-cards-container">
                    <div class="tnp-card">

                        <?php if ($stats == null) { ?>

                            <p>Not enough data, some hours are still required.</p>


                        <?php } else { ?>


                            <p>
                                Samples <?php echo count($stats->deltas) ?>, average <?php echo $stats->avg ?>&nbsp;s, max <?php echo $stats->max ?>&nbsp;s, min <?php echo $stats->min ?>&nbsp;s
                            </p>
                            <canvas id="tnp-cron-chart" style="width: 100%; height: 300px"></canvas>
                            <script>
                                jQuery(function () {
                                    var cronChartData = {
                                        labels: <?php echo json_encode($stats->deltas_ts) ?>,
                                        datasets: [
                                            {
                                                label: "Cron intervals",
                                                data: <?php echo json_encode($stats->deltas) ?>,
                                                borderColor: '#2980b9',
                                                fill: false
                                            }]
                                    };
                                    var cronChartConfig = {
                                        type: "line",
                                        data: cronChartData,
                                        options: {
                                            responsive: false,
                                            maintainAspectRatio: false,
                                            scales: {
                                                x: {
                                                    type: 'linear'
                                                },
                                                yAxes: [{
                                                        type: "linear",
                                                        ticks: {
                                                            beginAtZero: true
                                                        }
                                                    }
                                                ]

                                            }
                                        }
                                    };
                                    new Chart('tnp-cron-chart', cronChartConfig);
                                });
                            </script>

                        <?php } ?>
                    </div>
                </div>

                <div class="tnp-cards-container">
                    <div class="tnp-card">

                        <table class="widefat">
                            <thead>
                                <tr>
                                    <th>Parameter</th>
                                    <th></th>
                                    <th>Notes</th>
                                </tr>
                            </thead>

                            <?php
                            $condition = $this->has_newsletter_schedule() ? 1 : 0;
                            $schedules = wp_get_schedules();
                            ?>
                            <tr>
                                <td>
                                    Newsletter engine schedule
                                </td>
                                <td class="status"><?php $this->condition_flag($condition) ?></td>
                                <td>
                                    <?php if (!$condition) { ?>
                                        The Newsletter schedule is not present probably another plugin is interfering with the starndard WordPress scheuling system.<br>
                                        You can reactivate it, but is the problem persist
                                        <?php $controls->button('reschedule', 'Reactivate') ?>
                                    <?php } ?>

                                    Registered recurring schedules:<br>
                                    <ul style="margin-left: 0em;">
                                        <?php
                                        if (!empty($schedules)) {
                                            foreach ($schedules as $key => $data) {
                                                if ($key == 'newsletter') {
                                                    echo '<li style="padding: 0; margin: 0; font-weight: bold">', esc_html($key . ' - ' . $data['interval']), ' seconds</li>';
                                                } else {
                                                    if (!is_numeric($data['interval'])) {
                                                        echo '<li style="padding: 0; margin: 0; font-weight: bold; color: red;">', esc_html($key . ' - ' . $data['interval']), ' seconds (the interval is not a number!)</li>';
                                                    } else {
                                                        echo '<li style="padding: 0; margin: 0;">', esc_html($key . ' - ' . $data['interval']), ' seconds</li>';
                                                    }
                                                }
                                            }
                                        }
                                        ?>
                                    </ul>
                                </td>
                            </tr>


                            <tr>
                                <td>Cron URL</td>
                                <td class="status">&nbsp;</td>
                                <td>
                                    <strong><?php echo esc_html(site_url('/wp-cron.php')) ?></strong>
                                    <br><br>
                                    Can be used to trigger the WordPress scheduler from an external cron service.
                                </td>
                            </tr>




                            <tr>
                                <td>
                                    WordPress scheduler auto trigger
                                </td>
                                <td class="status">
                                    <?php //$this->condition_flag($condition)      ?>
                                </td>
                                <td>
                                    <?php $controls->button_test() ?>
                                </td>
                            </tr>

                            <?php
                            $condition = (defined('DISABLE_WP_CRON') && DISABLE_WP_CRON) ? 2 : 1;
                            ?>
                            <tr>
                                <td>
                                    <code>DISABLE_WP_CRON</code>
                                </td>
                                <td class="status">
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 2) { ?>
                                        The constant <code>DISABLE_WP_CRON</code> is set to <code>true</code> (probably in <code>wp-config.php</code>). That disables the scheduler auto triggering and it's
                                        good ONLY if you setup an external trigger.
                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <td>
                                    <code>ALTERNATE_WP_CRON</code>
                                </td>
                                <td class="status">
                                    &nbsp;
                                </td>
                                <td>
                                    <?php if (defined('ALTERNATE_WP_CRON') && ALTERNATE_WP_CRON) { ?>
                                        Using the alternate cron trigger. Rare configuration but should not be a problem.
                                    <?php } else { ?>
                                        Option not active, it's ok.
                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <td><code>NEWSLETTER_REAL_CRON_INTERVAL</code></td>
                                <td class="status">

                                </td>
                                <td>
                                    <?php echo (int)NEWSLETTER_REAL_CRON_INTERVAL, ' seconds'; ?>
                                </td>
                            </tr>

                            <?php
                            $condition = NEWSLETTER_CRON_INTERVAL == 300 ? 1 : 2;
                            if (NEWSLETTER_CRON_INTERVAL < 60 || NEWSLETTER_CRON_INTERVAL > 900) {
                                $condition = 0;
                            }
                            ?>
                            <tr>
                                <td><code>NEWSLETTER_CRON_INTERVAL</code></td>
                                <td class="status">
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php echo (int)NEWSLETTER_CRON_INTERVAL, ' seconds'; ?>
                                    <br><br>
                                    <?php if ($condition == 0) { ?>
                                        <span style="color: red; font-weight: bold;">The interval is too short, se it to at least 60 seconds.</span>
                                        <br><br>
                                    <?php } ?>
                                    How often the Newsletter engine should be activated. Default 300 seconds. Different value can be set on your <code>wp-config.php</code>
                                    (not recommended).
                                </td>
                            </tr>


                            <?php
                            $condition = WP_CRON_LOCK_TIMEOUT != MINUTE_IN_SECONDS ? 2 : 1;
                            ?>
                            <tr>
                                <td><code>WP_CRON_LOCK_TIMEOUT</code></td>
                                <td class="status">
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php echo WP_CRON_LOCK_TIMEOUT, ' seconds'; ?>

                                    <?php if ($condition == 2) { ?>
                                        <br>
                                        A non standard (<?php echo MINUTE_IN_SECONDS ?> seconds) value is specified probably in your <code>wp-config.php</code>.
                                    <?php } ?>
                                </td>
                            </tr>


                            <?php
                            $condition = (defined('NEWSLETTER_CRON_WARNINGS') && !NEWSLETTER_CRON_WARNINGS) ? 2 : 1;
                            ?>
                            <tr>

                                <td>
                                    <code>NEWSLETTER_CRON_WARNINGS</code>
                                </td>
                                <td class="status">
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 2) { ?>
                                        Scheduler warnings are disabled in your <code>wp-config.php</code> with the constant <code>NEWSLETTER_CRON_WARNINGS</code> set to true.
                                    <?php } else { ?>
                                        Scheduler warnings are enabled
                                    <?php } ?>
                                </td>
                            </tr>

                            <?php
                            $condition = has_filter('pre_reschedule_event') ? 2 : 1;
                            $functions = $this->get_hook_functions('pre_reschedule_event');
                            ?>
                            <tr>
                                <td><code>pre_reschedule_event</code></td>
                                <td class="status">
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 2) { ?>
                                        One or more plugin are filtering the jobs rescheduling. If a recurrent job (like the newsletter generation with Automated) disappers
                                        this is a good starting point.<br><br>
                                    <?php } ?>
                                    Attached functions:<br>
                                    <?php echo $functions ? $functions : '[none]' ?>
                                </td>
                            </tr>

                            <?php
                            $transient = get_transient('doing_cron');
                            ?>
                            <tr>
                                <td>Transient <code>doing_cron</code></td>
                                <td class="status">
                                    <?php //$this->condition_flag($condition)     ?>
                                </td>
                                <td>
                                    <?php if ($transient) { ?>
                                        <?php
                                        echo esc_html($transient);
                                        if (is_numeric($transient)) {
                                            echo ' (', $controls->print_date((int) $transient), ')';
                                        }
                                        ?>
                                    <?php } else { ?>
                                        [unset]
                                    <?php } ?>
                                    <br><br>
                                    When set it means the scheduler is executing background jobs. Install the WP Crontol plugin to have more information about
                                    your site background jobs.
                                </td>
                            </tr>

                            <?php
                            if (is_plugin_active('litespeed-cache/litespeed-cache.php')) {
                                ?>
                                <tr>
                                    <td>LiteSpeed Cache plugin</td>
                                    <td class="status">
                                        <?php $this->condition_flag(2); ?>
                                    </td>
                                    <td>
                                        If the Object Cache is active check if the Redis or Memcached parameters are set correctly and
                                        the connection is ok, otherwise the scheduler will suffer serious problems (skipped jobs and
                                        execution of only one job per run).
                                    </td>
                                </tr>
                            <?php } ?>

                        </table>
                    </div>
                </div>
            </div>

        </form>
    </div>

    <?php include NEWSLETTER_ADMIN_FOOTER; ?>

</div>