// Function to handle AJAX request for updating user profile views
function ajax_update_user_profile_views() {
    // Check the nonce for security
    check_ajax_referer('update_profile_view_nonce', 'nonce');

    // Get the user identifier from the AJAX request
    $user_identifier = isset($_POST['user_identifier']) ? sanitize_text_field($_POST['user_identifier']) : '';
    $identifier_type = isset($_POST['identifier_type']) ? sanitize_text_field($_POST['identifier_type']) : '';

    // Strict input validation for identifier_type
    if (!in_array($identifier_type, ['id', 'nicename', 'username'], true)) {
        wp_send_json_error('Invalid identifier type');
        return;
    }

    if ($user_identifier && $identifier_type) {
        // Get the user ID based on the identifier type
        $user_id = 0;
        switch ($identifier_type) {
            case 'id':
                $user_id = intval($user_identifier);
                break;
            case 'nicename':
                $user = get_user_by('slug', $user_identifier);
                if ($user) {
                    $user_id = $user->ID;
                }
                break;
            case 'username':
                $user = get_user_by('login', $user_identifier);
                if ($user) {
                    $user_id = $user->ID;
                }
                break;
        }

        // Validate user existence
        if ($user_id && get_userdata($user_id)) {
            // Define the meta keys for storing view counts and last view time
            $meta_key_count = 'jet_profile_views_count_engine';
            $meta_key_last_view = 'jet_profile_last_view_time_engine';

            // Get the current view count and last view time
            $view_count = get_user_meta($user_id, $meta_key_count, true);
            $last_view_time = get_user_meta($user_id, $meta_key_last_view, true);

            // Get the current time
            $current_time = time();

            // If no view count exists, initialize it to 0
            if ($view_count === '') {
                $view_count = 0;
            }

            // Check if this is a new view (more than 24 hours since last view)
            $time_threshold = 24 * 60 * 60; // 24 hours in seconds

            if (empty($last_view_time) || ($current_time - intval($last_view_time)) > $time_threshold) {
                // Increment the view count
                $view_count++;
                // Update the user meta with the new view count and current time
                update_user_meta($user_id, $meta_key_count, $view_count);
                update_user_meta($user_id, $meta_key_last_view, $current_time);
            }

            // Return the current view count
            wp_send_json_success($view_count);
        } else {
            wp_send_json_error('User not found');
        }
    } else {
        wp_send_json_error('Invalid user identifier or identifier type');
    }
}

// Hook the AJAX function for logged-in users and guests
add_action('wp_ajax_update_user_profile_views', 'ajax_update_user_profile_views');
add_action('wp_ajax_nopriv_update_user_profile_views', 'ajax_update_user_profile_views');

// Shortcode to display user profile view count
function user_profile_view_count_shortcode() {
    // Get the current user identifier from the URL
    $user_identifier = get_query_var('jet_pb_user');
    if (!$user_identifier) {
        return ''; // Return nothing if no user identifier is found
    }

    // Determine the identifier type
    $identifier_type = 'id'; // Default to ID
    if (!is_numeric($user_identifier)) {
        $identifier_type = username_exists($user_identifier) ? 'username' : 'nicename';
    }

    // Get the user ID
    $user_id = 0;
    switch ($identifier_type) {
        case 'id':
            $user_id = intval($user_identifier);
            break;
        case 'nicename':
            $user = get_user_by('slug', $user_identifier);
            if ($user) {
                $user_id = $user->ID;
            }
            break;
        case 'username':
            $user = get_user_by('login', $user_identifier);
            if ($user) {
                $user_id = $user->ID;
            }
            break;
    }

    if (!$user_id) {
        return ''; // Return nothing if no valid user is found
    }

    // Generate a nonce for security
    $nonce = wp_create_nonce('update_profile_view_nonce');

    // Inline JavaScript to trigger AJAX on page load and update display every 30 seconds
    ob_start(); ?>
    
        jQuery(document).ready(function($) {
            function updateViewCount() {
                $.post('', {
                    action: 'update_user_profile_views',
                    user_identifier: '',
                    identifier_type: '',
                    nonce: ''
                }, function(response) {
                    if (response.success) {
                        $('#profile-view-count').text('This profile has been viewed ' + response.data + ' times.');
                    } else {
                        console.error('Error updating view count:', response.data); // Error handling
                    }
                }).fail(function(jqXHR, textStatus, errorThrown) {
                    console.error('AJAX request failed:', textStatus, errorThrown); // Error handling
                });
            }

            // Initial update
            updateViewCount();

            // Update display every 30 seconds
            setInterval(updateViewCount, 30000);
        });
    
    <?php

    // Get the initial view count to display
    $view_count = get_user_meta($user_id, 'jet_profile_views_count_engine', true);
    $view_count = $view_count ? $view_count : 0;

    // Return the view count with a placeholder for dynamic updates
    return &#039;<p id="profile-view-count">This profile has been viewed ' . esc_html($view_count) . ' times.</p>';
}

// Register the shortcode
add_shortcode('user_profile_view_count', 'user_profile_view_count_shortcode');