[site-reviews] Add custom form fields

<?php
//
// ADDING CUSTOM FIELDS TO THE REVIEW FORM IS NOT ACTIVELY SUPPORTED!
// However, if you would like to try and do this on your own, this should help get you started.
// This will only work with Site Reviews 6
//
// Alternatively, please see: https://niftyplugins.com/plugins/site-reviews-forms/
//

/**
 * Modify the review form fields here
 * @param array $config
 * @return array
 */
add_filter('site-reviews/config/forms/review-form', function ($config) {
    $config['opinion'] = [
        'label' => __('Provide an opinion', 'your_theme_domain'),
        'required' => true,
        'type' => 'textarea',
    ];
    $config['service_rating'] = [
        'label' => __('Select a rating for the service', 'your_theme_domain'),
        'required' => true,
        'type' => 'rating',
    ];
    return $config;
});

/**
 * Perform custom field validation here
 * @param bool $isValid
 * @param array $requestData
 * @return bool|string
 */
add_filter('site-reviews/validate/custom', function ($isValid, $requestData) {
    // return true on success
    // or return false on failure
    // or return a custom error message string on failure
    return $isValid;
}, 10, 2);

/**
 * Triggered immediately after a review is saved
 * If you are uploading files, this is where you would save them to the database and attach them to the review
 * @param \GeminiLabs\SiteReviews\Review $review
 * @param \GeminiLabs\SiteReviews\Commands\CreateReview $command
 * @return void
 */
add_action('site-reviews/review/created', function ($review, $command) {
    // You may access the global $_POST and $_FILES here.
}, 10, 2);

/**
 * Set the default values of the custom fields here
 * @param \GeminiLabs\SiteReviews\Review $review
 * @return \GeminiLabs\SiteReviews\Review
 */
add_action('site-reviews/review/build/before', function ($review) {
    if (!isset($review->custom->opinion)) {
        $review->custom->set('opinion', '');
    }
    if (!isset($review->custom->service_rating)) {
        $review->custom->set('service_rating', 0);
    }
});

/**
 * Render the custom review fields here
 * In order to display the rendered custom fields, you will need to use a custom "review.php" template
 * as shown in the plugin FAQ ("How do I change the order of the review fields?")
 * and you will need to add your custom template tags to it, for example: {{ name_of_your_custom_field }}
 * @param array $templateTags
 * @param \GeminiLabs\SiteReviews\Review $review
 * @return array
 */
add_filter('site-reviews/review/build/after', function ($templateTags, $review) {
    foreach ($review->custom as $key => $value) {
        if ('service_rating' === $key) {
            $value = glsr_star_rating($value); // render the stars from the rating value
        }
        if (is_array($value)) {
            $list = array_reduce($value, function ($result, $item) {
                return "{$result}<li>{$item}</li>";
            });
            $value = "<ul>{$list}</ul>";
        }
        $templateTags[$key] = "<div class=\"glsr-custom-{$key}\">{$value}</div>";
    }
    return $templateTags;
}, 10, 2);

/**
 * Enable the Custom Fields metabox to display the values of the submitted custom fields
 * @return void
 */
add_action( 'admin_init', function() {
    add_post_type_support('site-review', 'custom-fields');
});