details.php

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<?php
use Elgg\Exceptions\Http\BadRequestException;
use Elgg\Exceptions\Http\PageNotFoundException;
use Elgg\Exceptions\Http\EntityPermissionsException;

$user = get_entity((int) elgg_extract('user_guid', $vars));
$entity = get_entity((int) elgg_extract('entity_guid', $vars));

if (!$user instanceof \ElggUser || !$entity instanceof \ElggEntity) {
    throw new BadRequestException();
}

if (!$user->canEdit()) {
    throw new EntityPermissionsException();
}

$methods = elgg_get_notification_methods();
if (empty($methods)) {
    throw new PageNotFoundException();
}

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

$detailed_subscriptions = [];
foreach ($entity->getSubscriptions($user->guid) as $subscription) {
    $parts = explode(':', $subscription->relationship);
    if (count($parts) > 2) {
        list(, $type, $subtype, $action, $method) = $parts;
        $detailed_subscriptions[$type][$subtype][$action][$method] = $method;
    }
}

$notification_events = elgg_get_notification_events();
$details = [];
foreach ($notification_events as $type => $subtypes) {
    foreach ($subtypes as $subtype => $actions) {
        /* @var $handler \Elgg\Notifications\NotificationEventHandler */
        foreach ($actions as $action => $handler) {
            // can users configure this handler
            if (!$handler::isConfigurableByUser()) {
                continue;
            }
            
            // can this handler be configured for the current container
            if (!$handler::isConfigurableForEntity($entity)) {
                continue;
            }
            
            $label = elgg_echo("notification:{$type}:{$subtype}:{$action}");
            $details[$label] = elgg_view_field([
                '#type' => 'checkboxes',
                '#label' => $label,
                '#class' => 'elgg-subscription-details',
                'name' => "subscriptions[{$entity->guid}][notify:{$type}:{$subtype}:{$action}]",
                'options' => $method_options,
                'value' => $detailed_subscriptions[$type][$subtype][$action] ?? [],
                'align' => 'horizontal',
            ]);
        }
    }
}

if (empty($details)) {
    echo elgg_view('page/components/no_results', [
        'no_results' => elgg_echo('notifications:subscriptions:details:no_results'),
    ]);
    return;
}

ksort($details, SORT_NATURAL | SORT_FLAG_CASE);
echo implode('', $details);

echo elgg_view_field([
    '#type' => 'fieldset',
    '#class' => 'mtm',
    'align' => 'horizontal',
    'justify' => 'right',
    'fields' => [
        [
            '#type' => 'button',
            'text' => elgg_echo('notifications:subscriptions:details:reset'),
            'class' => ['elgg-button-delete', 'elgg-subscriptions-details-reset'],
        ],
    ],
]);