// Add ACF fields
if( function_exists('acf_add_local_field_group') ):

acf_add_local_field_group(array(
    'key' => 'group_60ad5e73694e4',
    'title' => 'Development Theme Settings',
    'fields' => array(
        array(
            'key' => 'field_60ad5e7f9e5f0',
            'label' => 'Development Mode',
            'name' => 'development_mode',
            'type' => 'true_false',
            'instructions' => 'Enable development mode to use the development theme.',
            'required' => 0,
            'conditional_logic' => 0,
            'wrapper' => array(
                'width' => '',
                'class' => '',
                'id' => '',
            ),
            'message' => '',
            'default_value' => 0,
            'ui' => 0,
            'ui_on_text' => '',
            'ui_off_text' => '',
        ),
        array(
            'key' => 'field_60ad5ed39e5f1',
            'label' => 'Allowed Users',
            'name' => 'allowed_users',
            'type' => 'user',
            'instructions' => 'Select users who have access to the development theme.',
            'required' => 0,
            'conditional_logic' => 0,
            'wrapper' => array(
                'width' => '',
                'class' => '',
                'id' => '',
            ),
            'role' => array(
                0 => 'all',
            ),
            'allow_null' => 0,
            'multiple' => 1,
            'return_format' => 'id',
        ),
        array(
            'key' => 'field_60b355be128ce',
            'label' => 'Development Theme',
            'name' => 'development_theme',
            'type' => 'select',
            'instructions' => 'Select the development theme.',
            'required' => 0,
            'conditional_logic' => 0,
            'wrapper' => array(
                'width' => '',
                'class' => '',
                'id' => '',
            ),
            'choices' => custom_get_installed_themes(),
            'default_value' => array(),
            'allow_null' => 0,
            'multiple' => 0,
            'ui' => 0,
            'return_format' => 'value',
            'ajax' => 0,
            'placeholder' => '',
        ),
    ),
    'location' => array(
        array(
            array(
                'param' => 'options_page',
                'operator' => '==',
                'value' => 'dev-theme-settings',
            ),
        ),
    ),
    'menu_order' => 0,
    'position' => 'normal',
    'style' => 'default',
    'label_placement' => 'top',
    'instruction_placement' => 'label',
    'hide_on_screen' => '',
    'active' => true,
    'description' => '',
));

endif;

// Function to get installed themes
function custom_get_installed_themes() {
    $themes = wp_get_themes();
    $choices = array();
    foreach ($themes as $theme) {
        $choices[$theme->get_stylesheet()] = $theme->get('Name');
    }
    return $choices;
}

// Load appropriate theme based on development mode
add_filter('template', 'custom_load_theme');
add_filter('stylesheet', 'custom_load_theme');

function custom_load_theme($theme) {
    global $development_mode;

    if ($development_mode) {
        // Check if user has access to development theme
        $current_user = wp_get_current_user();
        $allowed_users = get_field('allowed_users', 'option');
        $user_has_access = in_array($current_user->ID, $allowed_users);

        if ($user_has_access) {
            // Get selected development theme from ACF field
            $selected_theme = get_field('development_theme', 'option');

            if (!empty($selected_theme)) {
                add_filter('option_template', function() use ($selected_theme) {
                    return $selected_theme;
                });
                add_filter('option_stylesheet', function() use ($selected_theme) {
                    return $selected_theme;
                });

                return $selected_theme; // Load selected development theme
            }
        }
    }

    return $theme; // Load regular theme
}