roi-theme/admin/theme-options/theme-options.php

<?php
/**
 * Theme Options Admin Page
 *
 * @package Apus_Theme
 * @since 1.0.0
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Add admin menu
 * DESACTIVADO: Ahora se usa el nuevo Admin Panel en admin/includes/class-admin-menu.php
 */
/*
function apus_add_admin_menu() {
    add_theme_page(
        __('Apus Theme Options', 'apus-theme'),        // Page title
        __('Theme Options', 'apus-theme'),             // Menu title
        'manage_options',                               // Capability
        'apus-theme-options',                           // Menu slug
        'apus_render_options_page',                     // Callback function
        30                                              // Position
    );
}
add_action('admin_menu', 'apus_add_admin_menu');
*/

/**
 * Render the options page
 */
function apus_render_options_page() {
    // Check user capabilities
    if (!current_user_can('manage_options')) {
        wp_die(__('You do not have sufficient permissions to access this page.', 'apus-theme'));
    }

    // Load the template
    include get_template_directory() . '/admin/theme-options/options-page-template.php';
}

/**
 * Enqueue admin scripts and styles
 */
function apus_enqueue_admin_scripts($hook) {
    // Only load on our theme options page
    if ($hook !== 'appearance_page_apus-theme-options') {
        return;
    }

    // Enqueue WordPress media uploader
    wp_enqueue_media();

    // Enqueue admin styles
    wp_enqueue_style(
        'apus-admin-options',
        get_template_directory_uri() . '/admin/assets/css/theme-options.css',
        array(),
        APUS_VERSION
    );

    // Enqueue admin scripts
    wp_enqueue_script(
        'apus-admin-options',
        get_template_directory_uri() . '/admin/assets/js/theme-options.js',
        array('jquery', 'wp-color-picker'),
        APUS_VERSION,
        true
    );

    // Localize script
    wp_localize_script('apus-admin-options', 'apusAdminOptions', array(
        'ajaxUrl'           => admin_url('admin-ajax.php'),
        'nonce'             => wp_create_nonce('apus_admin_nonce'),
        'strings'           => array(
            'selectImage'   => __('Select Image', 'apus-theme'),
            'useImage'      => __('Use Image', 'apus-theme'),
            'removeImage'   => __('Remove Image', 'apus-theme'),
            'confirmReset'  => __('Are you sure you want to reset all options to default values? This cannot be undone.', 'apus-theme'),
            'saved'         => __('Settings saved successfully!', 'apus-theme'),
            'error'         => __('An error occurred while saving settings.', 'apus-theme'),
        ),
    ));
}
add_action('admin_enqueue_scripts', 'apus_enqueue_admin_scripts');

/**
 * Add settings link to theme actions
 */
function apus_add_settings_link($links) {
    $settings_link = '<a href="' . admin_url('themes.php?page=apus-theme-options') . '">' . __('Settings', 'apus-theme') . '</a>';
    array_unshift($links, $settings_link);
    return $links;
}
add_filter('theme_action_links_' . get_template(), 'apus_add_settings_link');

/**
 * AJAX handler for resetting options
 */
function apus_reset_options_ajax() {
    check_ajax_referer('apus_admin_nonce', 'nonce');

    if (!current_user_can('manage_options')) {
        wp_send_json_error(array('message' => __('Insufficient permissions.', 'apus-theme')));
    }

    // Delete options to reset to defaults
    delete_option('apus_theme_options');

    wp_send_json_success(array('message' => __('Options reset to defaults successfully.', 'apus-theme')));
}
add_action('wp_ajax_apus_reset_options', 'apus_reset_options_ajax');

/**
 * AJAX handler for exporting options
 */
function apus_export_options_ajax() {
    check_ajax_referer('apus_admin_nonce', 'nonce');

    if (!current_user_can('manage_options')) {
        wp_send_json_error(array('message' => __('Insufficient permissions.', 'apus-theme')));
    }

    $options = get_option('apus_theme_options', array());

    wp_send_json_success(array(
        'data' => json_encode($options, JSON_PRETTY_PRINT),
        'filename' => 'apus-theme-options-' . date('Y-m-d') . '.json'
    ));
}
add_action('wp_ajax_apus_export_options', 'apus_export_options_ajax');

/**
 * AJAX handler for importing options
 */
function apus_import_options_ajax() {
    check_ajax_referer('apus_admin_nonce', 'nonce');

    if (!current_user_can('manage_options')) {
        wp_send_json_error(array('message' => __('Insufficient permissions.', 'apus-theme')));
    }

    if (!isset($_POST['import_data'])) {
        wp_send_json_error(array('message' => __('No import data provided.', 'apus-theme')));
    }

    $import_data = json_decode(stripslashes($_POST['import_data']), true);

    if (json_last_error() !== JSON_ERROR_NONE) {
        wp_send_json_error(array('message' => __('Invalid JSON data.', 'apus-theme')));
    }

    // Sanitize imported data
    $sanitized_data = apus_sanitize_options($import_data);

    // Update options
    update_option('apus_theme_options', $sanitized_data);

    wp_send_json_success(array('message' => __('Options imported successfully.', 'apus-theme')));
}
add_action('wp_ajax_apus_import_options', 'apus_import_options_ajax');

/**
 * Add admin notices
 */
function apus_admin_notices() {
    $screen = get_current_screen();
    if ($screen->id !== 'appearance_page_apus-theme-options') {
        return;
    }

    // Check if settings were updated
    if (isset($_GET['settings-updated']) && $_GET['settings-updated'] === 'true') {
        ?>
        <div class="notice notice-success is-dismissible">
            <p><?php _e('Settings saved successfully!', 'apus-theme'); ?></p>
        </div>
        <?php
    }
}
add_action('admin_notices', 'apus_admin_notices');

/**
 * Register theme options in Customizer as well (for preview)
 */
function apus_customize_register($wp_customize) {
    // Add a panel for theme options
    $wp_customize->add_panel('apus_theme_options', array(
        'title'       => __('Apus Theme Options', 'apus-theme'),
        'description' => __('Configure theme options (Also available in Theme Options page)', 'apus-theme'),
        'priority'    => 10,
    ));

    // General Section
    $wp_customize->add_section('apus_general', array(
        'title'    => __('General Settings', 'apus-theme'),
        'panel'    => 'apus_theme_options',
        'priority' => 10,
    ));

    // Enable breadcrumbs
    $wp_customize->add_setting('apus_theme_options[enable_breadcrumbs]', array(
        'default'           => true,
        'type'              => 'option',
        'sanitize_callback' => 'apus_sanitize_checkbox',
    ));

    $wp_customize->add_control('apus_theme_options[enable_breadcrumbs]', array(
        'label'   => __('Enable Breadcrumbs', 'apus-theme'),
        'section' => 'apus_general',
        'type'    => 'checkbox',
    ));
}
add_action('customize_register', 'apus_customize_register');