record.php

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<?php
$user = elgg_extract('user', $vars);
$entity = elgg_extract('entity', $vars);

if (!$entity instanceof ElggEntity || !$user instanceof ElggUser || !$user->canEdit()) {
    return;
}

$methods = elgg_get_notification_methods();
if (empty($methods)) {
    return;
}

elgg_require_js('notifications/subscriptions/record');
elgg_require_css('notifications/subscriptions/record');

$icon = elgg_view_entity_icon($entity, 'tiny');

$preferred_methods = [];
$has_detailed_subscriptions = false;

// This volatile data is stored during a query with a custom select option
$relationships_concat = $entity->getVolatileData('select:relationships');
if (isset($relationships_concat)) {
    $relationships = explode(',', $relationships_concat);
    foreach ($relationships as $relationship) {
        if (strpos($relationship, 'notify:') === false) {
            continue;
        }
        
        $parts = explode(':', $relationship);
        if (count($parts) > 2) {
            $has_detailed_subscriptions = true;
        } else {
            $type = $parts[1];
            $preferred_methods[$type] = $type;
        }
    }
} else {
    foreach ($methods as $method) {
        if ($entity->hasSubscription($user->guid, $method)) {
            $preferred_methods[$method] = $method;
        }
    }
}

$method_options = [];
foreach ($methods as $method) {
    $label = elgg_echo("notification:method:{$method}");
    $method_options[$label] = $method;
}

$container = elgg_format_element('div', ['class' => 'elgg-subscription-description'], elgg_view_image_block($icon, elgg_view_entity_url($entity)));
$container .= elgg_view_field([
    '#type' => 'checkboxes',
    '#class' => 'elgg-subscription-methods',
    'name' => "subscriptions[{$entity->guid}][notify]",
    'options' => $method_options,
    'value' => $preferred_methods,
    'align' => 'horizontal',
    'disabled' => $has_detailed_subscriptions,
]);

$icon_class = ['elgg-subscription-details-toggle'];
if ($has_detailed_subscriptions) {
    $icon_class[] = 'elgg-state-active';
}

$container .= elgg_view('output/url', [
    'href' => false,
    'text' => elgg_echo('settings'),
    'title' => elgg_echo('notifications:subscriptions:record:settings'),
    'icon' => 'chevron-down',
    'class' => $icon_class,
    'data-view' => elgg_http_add_url_query_elements('notifications/subscriptions/details', [
        'user_guid' => $user->guid,
        'entity_guid' => $entity->guid,
    ]),
]);
$container .= elgg_view('output/url', [
    'href' => false,
    'text' => elgg_echo('settings'),
    'icon' => 'chevron-up',
    'class' => array_merge($icon_class, ['hidden']),
]);

echo elgg_format_element('div', ['class' => 'elgg-subscription-container'], $container);

// placeholder for the details
echo elgg_format_element('div', ['class' => 'elgg-subscription-container-details']);